CN107719052A

CN107719052A - Draft hitch

Info

Publication number: CN107719052A
Application number: CN201710821816.4A
Authority: CN
Inventors: 小暮胜; 塚崎裕郎; 塚崎裕一郎; 齐藤正容; 诸田和也; 绵贯贤二; 日向俊行; 山田大辅; 大岛健介; 宇津木芳明; 仲武圣仁; 富泽英久; 井本昌志; 石田斗志
Original assignee: Subaru Corp
Current assignee: Subaru Corp
Priority date: 2013-03-28
Filing date: 2014-03-28
Publication date: 2018-02-23
Anticipated expiration: 2034-03-28
Also published as: CN107719052B; JP6087696B2; JP2014193642A

Abstract

The present invention provides a kind of trailing wheel draft hitch of the influence for the vertical force compliance steer for suppressing or offsetting turning generation at initial stage, and it possesses：Hub bearing support, it supports the trailing wheel of vehicle in a manner of the trailing wheel of vehicle can surround axletree rotation；Suspension link, its both ends can joltily be installed in car body and hub bearing respectively, and hub bearing support is supported with can producing stroke for car body；Bearing spring, it produces reaction force corresponding with respect to the relative shift of the vertical direction of car body with hub bearing support；And shock absorber, it produces damping force corresponding with respect to the relative velocity of the vertical direction of car body with hub bearing support, also there is the vertical force acted on by the tyre surface increased in trailing wheel to make rear-axle steering to the vertical force compliance-steer coefficient of prenex side or posterior cord side, beam angle change generation unit is also equipped with, it produces the beam angle change for offsetting or suppressing the direction that the beam angle as caused by vertical force compliance-steer coefficient changes at the initial stage of turning of vehicle temporarily.

Description

Draft hitch

It is on March 28th, 2014 applying date that the application, which is, Application No. 201410130829.3, entitled " suspension The divisional application of the patent application of device ".

Technical field

The present invention relates to the trailing wheel draft hitch of automobile, can suppress more particularly, to one kind or offset turning hair at initial stage The trailing wheel draft hitch of the influence of raw vertical force compliance steer.

Background technology

The trailing wheel of the vehicles such as automobile passes through the suspension link (connecting rod) that can joltily be installed relative to car body with draft hitch The supporting wheel hub support of bearing so that the hub bearing support relative to car body vertical direction can sweeping action, the hub bearing Support is pivotably supported trailing wheel.

Such trailing wheel draft hitch, as one, the flare of trailing wheel is carried out by upper and lower a pair of transverse link The positioning in direction, and the transverse link of a pair of lower is configured to carry out the positioning in beam angle direction by time interval.

Following device is described as one of the draft hitch of such trailing wheel, such as in patent document 1：Using Front and rear transverse link (lower link) and vertical connecting rod that subframe can be installed joltily positions hub bearing support, the subframe It is installed in below rear vehicle.

The end of the side of these each connecting rods either both sides is connected to car body or wheel via the rubber bush of vibrationproof The hub support of bearing.

Such as in the case of Ackermann steer angle Lateral Force, due to the deformation of the rubber bush of front and rear transverse link Amount is different, produces trailing wheel to the cross force compliance steer of prenex (toe in) or posterior cord (toe out) direction change beam angle.

Generally, in Ackermann steer angle, preferably turning foreign steamer side is toe-in, and turning lubrication groove side is the tendency of posterior cord, therefore Before and after setting during the rigidity of the rubber bush of transverse link, often with compared with rear side, relative to the displacement of cross force preceding The bigger mode in side is set.

In addition, form geometric configuration (the ジオメトリー of each connecting rod class of suspension：Geometry) also generally assigned Give following steering of jolting (bump steer) characteristic：It is inclined to, is turning to be prenex in turning foreign steamer side Ji Shangtiao sides (compressed side) Curved lubrication groove side is that resilience side (stretching, extension side) is inclined to for posterior cord.

Prior art literature

Patent document

Patent document 1：Japanese Unexamined Patent Publication 2011-57021 publications

However, as described above, the foreign steamer side for caused by showing cross force during as turning is prenex, lubrication groove side is , can the with good grounds compliance steer as caused by vertical force at the initial stage of turning for the suspension of cross force compliance steer as posterior cord (vertical force compliance steer) and show the situation that foreign steamer side is posterior cord, lubrication groove side is prenex tendency.

Then, the cross force increase and stroke of suspension starts, cross force compliance steer occurs, jolt steering when, it is final outer The tendency that side turns into prenex is taken turns, lubrication groove side turns into the tendency of posterior cord, but due to temporarily anti-phase being turned in turning trailing wheel at initial stage To so that control stability reduces.

The content of the invention

In view of the above problems, problem of the invention is a kind of vertical force that can suppress or offset turning generation at initial stage of offer The trailing wheel draft hitch of the influence of compliance steer.

The present invention solves above-mentioned problem by following solution.

First form of the invention is a kind of draft hitch, it is characterised in that is possessed：Hub bearing support, it is with vehicle Trailing wheel can surround the trailing wheel that the mode that axletree rotates supports vehicle；Suspension link, its both ends are able to joltily be pacified Loaded on car body and hub bearing support, and support the hub bearing support can relatively described car body generation stroke；It is outstanding Frame spring, it produces reaction corresponding with the relative shift of the vertical direction of the relatively described car body of the hub bearing support Power；And shock absorber, it produces decline corresponding with the relative velocity of the vertical direction of the relatively described car body of the hub bearing support Subtract power, and increase of the draft hitch with the vertical force according to the tyre surface for acting on the trailing wheel makes the rear-axle steering extremely Prenex side or the vertical force compliance-steer coefficient of posterior cord side, the draft hitch be also equipped with beam angle change generation unit, its The turning of vehicle produces beam angle change initial stage temporarily, and the direction of beam angle change towards counteracting or suppresses flexible by the vertical force The direction that beam angle caused by steering characteristic changes.

Accordingly, significantly turned initial stage in the influence of vertical force compliance steer, by producing counteracting or suppressing the characteristic Direction beam angle change, so as to prevent the beam angle of trailing wheel invert and improve driving stability.

Second form of the invention is the draft hitch as described in the first form, it is characterised in that the beam angle change produces Unit possesses braking and drive force difference generation unit, and it is poor that its trailing wheel in left and right produces braking and drive force.

Accordingly, using front and rear power compliance-steer coefficient possessed by suspension, direction can just be produced by simply forming The beam angle change of desired orientation.

3rd form of the invention is the draft hitch as described in the second form, it is characterised in that is had by acting on car The brake force at wheel center is so that the wheel center rear dragging posterior cord characteristic that hub bearing support is offset to posterior cord direction, the system Dynamic driving force difference generation unit has the driver element for the driving force that can individually control left and right wheels, relative to turning lubrication groove side Increase the driving force of turning foreign steamer side.

4th form of the invention is the draft hitch as described in the second form, it is characterised in that is had by acting on car The brake force at wheel center is so that the wheel center rear dragging posterior cord characteristic that hub bearing support is offset to posterior cord direction, the system Dynamic driving force difference generation unit has the brake unit for the brake force that can individually control left and right wheels, relative to turning lubrication groove side Reduce the brake force of turning foreign steamer side.

5th form of the invention is the draft hitch as described in the second form, it is characterised in that is had by acting on car The brake force at wheel center is so that the wheel center rear dragging posterior cord characteristic that hub bearing support is offset to posterior cord direction, the system Dynamic driving force difference generation unit has the driver element for the driving force that can individually control left and right wheels and can individually control left and right The brake unit of the brake force of wheel, apply brake force in turning lubrication groove, and apply driving force in turning foreign steamer.

According to these each inventions, the effect above can be reliably obtained.

6th form of the invention is the draft hitch as described in the 3rd or the 5th form, it is characterised in that the driving is single Member possesses the drive motor set respectively in left and right trailing wheel.

Hereby it is possible to driving force that is easy and suitably controlling left and right trailing wheel.

7th form of the invention is the draft hitch as described in the first to the 5th any one of form, it is characterised in that described Beam angle changes generation unit and carries out the beam in a manner of changing according to the vertical load of the trailing wheel and change beam angle variable quantity The generation control of angle change.

Beam angle variable quantity (steering volume) changes according to the vertical load of trailing wheel caused by by vertical force compliance steer, Therefore, driving stability is further improved hereby it is possible to suitably set beam angle variable quantity.

8th form of the invention is the draft hitch as described in the first to the 5th any one of form, it is characterised in that described Beam angle changes generation unit to be made beam angle variable quantity slowly varying and reduces at the end of the generation of the beam angle change is made.

Hereby it is possible to prevent beam angle suddenly change and give the sense of discomfort of driver.

9th form of the invention is the draft hitch as described in the first to the 5th any one of form, it is characterised in that described The stroke of bearing spring and the shock absorber described in beam angle change generation unit reaches more than predetermined value and described in terminating The generation of beam angle change.

Accordingly, foreign steamer can obtained to prenex side, lubrication groove backward by jolting steering and/or cross force compliance steer In the case of the sufficient beam angle change of beam side, it can prevent excessive beam angle from changing, further improve driving stability.

Tenth form of the invention is a kind of draft hitch, it is characterised in that is possessed：Hub bearing support, it is with vehicle Trailing wheel can surround the trailing wheel that the mode that axletree rotates supports vehicle；Suspension link, its both ends are able to joltily be pacified Loaded on car body and hub bearing support, and support the hub bearing support can relatively described car body generation stroke；It is outstanding Frame spring, it produces reaction corresponding with the relative shift of the vertical direction of the relatively described car body of the hub bearing support Power；Shock absorber, it produces decay corresponding with the relative velocity of the vertical direction of the relatively described car body of the hub bearing support Power；With trailing wheel steering driver, it applies steering angle in trailing wheel, and there is the draft hitch basis to act on the trailing wheel The increase of the vertical force of tyre surface makes the rear-axle steering to the vertical force compliance-steer coefficient of prenex side or posterior cord side, after described The turning that steering driver is taken turns in vehicle is being offset or suppressed as caused by the vertical force compliance-steer coefficient temporarily initial stage Steering angle is put on the trailing wheel by the direction of beam angle change.

Accordingly, by using trailing wheel steering driver, it will offset or suppress the beam as caused by vertical force compliance steer The steering angle in direction of angle change puts on trailing wheel, so as to prevent turning initial stage interim foreign steamer to posterior cord side, lubrication groove Driving stability is improved to the beam angle change of prenex side.

11st form of the invention is the draft hitch as described in the tenth form, it is characterised in that the trailing wheel steering is driven Dynamic device applies the steering in a manner of changing according to the vertical load of the trailing wheel and change the steering angle to the trailing wheel Angle.

Accordingly, it is flexible equivalent to by vertical force so as to apply by applying the steering angle changed according to vertical load The steering angle that beam angle caused by steering changes, suppress due to beam angle suddenly change and caused by sense of discomfort.

12nd form of the invention is such as the tenth or the 11st draft hitch as described in form, it is characterised in that after described Wheel steering driver makes the steering angle slowly varying and reduced at the end of the application of the steering angle is made.

Hereby it is possible to the unexpected beam angle change at the end of preventing beam angle correction, suppresses to make due to beam angle suddenly change Into sense of discomfort.

13rd form of the invention is such as the tenth or the 11st draft hitch as described in form, it is characterised in that after described Wheel steering driver reaches more than predetermined value according to the stroke of the bearing spring and the shock absorber and terminates the steering The application at angle.

Accordingly, foreign steamer can obtained to prenex side, lubrication groove backward by jolting steering and/or cross force compliance steer In the case of the sufficient beam angle change of beam side, it can prevent excessive beam angle from changing and further improving driving stability.

14th form of the invention is a kind of draft hitch, it is characterised in that is possessed：Hub bearing support, it is with vehicle Trailing wheel can surround the mode of axletree rotation and support the trailing wheel of vehicle；Suspension link, its both ends be able to joltily by Car body and hub bearing support are installed on, and supports the hub bearing support can relatively described car body generation stroke； Bearing spring, it produces counter make corresponding with the relative shift of the vertical direction of the relatively described car body of the hub bearing support Firmly；And shock absorber, its generation are corresponding with the relative velocity of the vertical direction of the relatively described car body of the hub bearing support Damping force, and increase of the draft hitch with the vertical force according to the tyre surface for acting on the trailing wheel makes the rear-axle steering To the vertical force compliance-steer coefficient of prenex side or posterior cord side, the draft hitch is also equipped with adjustable attenuation unit, and it is in car Shock absorber described in initial stage temporary decrease of turning damping force.

Accordingly, by reducing the damping force of shock absorber at the initial stage of turning, so as to promote the stroke of suspension, produced in early stage Raw jolt steering and cross force compliance steer, shorten due to vertical force compliance steer and make foreign steamer temporarily to posterior cord side, lubrication groove Temporarily driving stability is improved to the time that prenex side turns to.

15th form of the invention is the draft hitch as described in the 14th form, it is characterised in that the adjustable attenuation Unit reaches more than predetermined value according to the stroke of the bearing spring and the shock absorber and terminates the reduction of the damping force.

Accordingly, stroke is produced by shock absorber, after counteracting the influence of vertical force compliance steer according to steering etc. of jolting, The damping force of shock absorber returns to reset condition, and driving stability is further improved so as to prevent the underdamping in turning Property.

16th form of the invention is a kind of draft hitch, it is characterised in that is possessed：Hub bearing support, it is with vehicle Trailing wheel can surround the mode of axletree rotation and support the trailing wheel of vehicle；Suspension link, its both ends be able to joltily by Car body and hub bearing support are installed on, and supports the hub bearing support can relatively described car body generation stroke； Bearing spring, it produces counter make corresponding with the relative shift of the vertical direction of the relatively described car body of the hub bearing support Firmly；Shock absorber, it produces decline corresponding with the relative velocity of the vertical direction of the relatively described car body of the hub bearing support Subtract power；And stabilising arrangement, it produces reaction force according to the progressive error of the shock absorber of left and right, and the draft hitch has The increase of the vertical force of the with good grounds tyre surface for acting on the trailing wheel makes the rear-axle steering perpendicular to prenex side or posterior cord side To power compliance-steer coefficient, the draft hitch is also equipped with rolling rigidity control unit, and it drops initial stage temporarily in the turning of vehicle The inclination rigidity of the low stabilising arrangement.

Accordingly, by reducing the inclination rigidity of stabilising arrangement at the initial stage of turning, so as to promote the stroke of suspension, in morning Phase produces jolt steering and cross force compliance steer, shortens because vertical force compliance steer foreign steamer is temporarily to posterior cord side, lubrication groove Temporarily driving stability is improved to the time that prenex side turns to.

17th form of the invention is the draft hitch as described in the 16th form, it is characterised in that described to roll rigidity Control unit reaches more than predetermined value according to the stroke of the bearing spring and the shock absorber and terminates the inclination rigidity Reduction.

Accordingly, stroke is produced by shock absorber, after counteracting the influence of vertical force compliance steer according to steering etc. of jolting, Roll rigidity and returns to reset condition, rigidity deficiency is rolled during so as to prevent steady turn and improves driving stability.

18th form of the invention is a kind of draft hitch, it is characterised in that is possessed：Hub bearing support, it is with vehicle Trailing wheel can surround the mode of axletree rotation and support the trailing wheel of vehicle；Suspension link, its both ends be able to joltily by Car body and hub bearing support are installed on, and supports the hub bearing support can relatively described car body generation；Suspension Spring, it produces reaction corresponding with the relative shift of the vertical direction of the relatively described car body of the hub bearing support Power；And shock absorber, it produces decline corresponding with the relative velocity of the vertical direction of the relatively described car body of the hub bearing support Subtract power, and increase of the draft hitch with the vertical force according to the tyre surface for acting on the trailing wheel makes the rear-axle steering extremely Prenex side or the vertical force compliance-steer coefficient of posterior cord side, the draft hitch be also equipped with beam angle change generation unit, its The turning of vehicle produces beam angle change initial stage temporarily, and the direction of beam angle change towards counteracting or suppresses flexible by the vertical force The direction that beam angle caused by steering characteristic changes, the beam angle change generation unit have stroke controlling unit, the stroke control Unit processed makes the shock absorber of turning foreign steamer side forcibly produce stroke in compressed side.

Accordingly, the shock absorber of turning foreign steamer side is forcibly produced stroke in compressed side initial stage in turning, so as to Early stage produces steering of jolting, and prevents from causing foreign steamer to turn to posterior cord side temporarily according to vertical force compliance steer and improving driving stability Property.

19th form of the invention is a kind of draft hitch, it is characterised in that is possessed：Hub bearing support, it is with vehicle Trailing wheel can surround the mode of axletree rotation and support the trailing wheel of vehicle；Suspension link, its both ends be able to joltily by Car body and hub bearing support are installed on, and supports the hub bearing support can relatively described car body generation stroke； Bearing spring, it produces counter make corresponding with the relative shift of the vertical direction of the relatively described car body of the hub bearing support Firmly；And shock absorber, its generation are corresponding with the relative velocity of the vertical direction of the relatively described car body of the hub bearing support Damping force, and increase of the draft hitch with the vertical force according to the tyre surface for acting on the trailing wheel makes the rear-axle steering To the vertical force compliance-steer coefficient of prenex side or posterior cord side, the draft hitch is also equipped with beam angle change generation unit, its Beam angle change is produced temporarily initial stage, the direction of beam angle change towards counteracting or suppresses soft by the vertical force in the turning of vehicle The direction that beam angle caused by sexual deviation characteristic changes, the beam angle change generation unit have load applying unit, the load Compressive load is applied to the shock absorber of turning foreign steamer side by applying unit.

Accordingly, compressive load is applied by the shock absorber in the foreign steamer side at the initial stage of turning, so as to make to be directed to shock absorber Input load increase, release shock absorber stuck in early stage and promote stroke at initial stage, the steering characteristic that jolts, contracting are produced in early stage Driving stability is improved during the short influence for showing vertical force compliance-steer coefficient.

20th form of the invention is the draft hitch as described in the 18th or the 19th form, it is characterised in that described Beam angle change generation unit reaches more than predetermined value in the load of the shock absorber load of turning foreign steamer side and terminates institute State the generation of beam angle change.

21st form of the invention is a kind of draft hitch, it is characterised in that is possessed：Hub bearing support, it is with car Trailing wheel can surround the mode of axletree rotation and support the trailing wheel of vehicle；Suspension link, its both ends are able to joltily Car body and hub bearing support are installed in, and supports the hub bearing support can relatively described car body generation row Journey；Bearing spring, its generation are corresponding with the relative shift of the vertical direction of the relatively described car body of the hub bearing support Reaction force；And shock absorber, it produces the relative velocity pair of the vertical direction of the car body relative with the hub bearing support The damping force answered, and increase of the draft hitch with the vertical force according to the tyre surface for acting on the trailing wheel makes the trailing wheel The vertical force compliance-steer coefficient of prenex side or posterior cord side is diverted to, the draft hitch is also equipped with beam angle change and produces list Member, it produces beam angle change initial stage temporarily in the turning of vehicle, and the direction of beam angle change towards counteracting or suppresses by described perpendicular The direction changed to beam angle caused by power compliance-steer coefficient, it is single that there is the beam angle change generation unit roll moment to produce Member, the roll moment in the direction that the shock absorber that the roll moment generation unit produces turning foreign steamer side is compressed.

Accordingly, by forcing to produce inclination according to the roll moment generation unit such as active stabilizing device, suspension is made Produce stroke, jolted steering so as to be produced in early stage, can prevent according to vertical force compliance steer cause foreign steamer temporarily to Posterior cord side turns to and improves driving stability.

22nd form of the invention is the draft hitch as described in the 21st form, it is characterised in that the beam angle The stroke of bearing spring and the shock absorber described in change generation unit reaches more than predetermined value and terminates the beam angle The generation of change.

23rd form of the invention is a kind of draft hitch, it is characterised in that is possessed：Hub bearing support, it is with car Trailing wheel can surround the mode of axletree rotation and support the trailing wheel of vehicle；Suspension link, its both ends are able to joltily Car body and hub bearing support are installed in, and supports the hub bearing support can relatively described car body generation row Journey；Bearing spring, its generation are corresponding with the relative shift of the vertical direction of the relatively described car body of the hub bearing support Reaction force；And shock absorber, it produces the relative velocity pair of the vertical direction of the car body relative with the hub bearing support The damping force answered, and increase of the draft hitch with the vertical force according to the tyre surface for acting on the trailing wheel makes the trailing wheel The vertical force compliance-steer coefficient of prenex side or posterior cord side is diverted to, the draft hitch is also equipped with beam angle change and produces list Member, it produces beam angle change initial stage temporarily in the turning of vehicle, and the direction of beam angle change towards counteracting or suppresses by described perpendicular The direction changed to beam angle caused by power compliance-steer coefficient, the beam angle change generation unit have support rigidity control list Member, the support rigid element are arranged on adjustable between the upper end of the shock absorber and car body in turning increase temporarily at initial stage The rigidity of rigid elastic body support frame.

Accordingly, by making the interim increase of the rigidity of adjustable rigid elasticity body support frame initial stage in turning, so as to vibration damping The input increase at initial stage of device, the effect that shock absorber is released in early stage promote stroke, produce the steering characteristic that jolts in early stage, shorten table Driving stability is improved during revealing the influence of vertical force compliance-steer coefficient.

24th form of the invention is the draft hitch as described in the 23rd form, it is characterised in that the support Rigidity control unit reaches more than predetermined value according to the stroke of the shock absorber and makes the firm of the adjustable rigid elasticity body support frame Property return to turn start before state.

In addition, by making the rigidity of support relatively reduce initial stage relative to turning beyond turning initial stage, so as to Improve vibration, the sensation taken.

25th form of the invention is a kind of draft hitch, it is characterised in that is possessed：Hub bearing support, it is with car Trailing wheel can surround the mode of axletree rotation and support the trailing wheel of vehicle；Suspension link, its both ends are able to joltily Car body and hub bearing support are installed in, and supports the hub bearing support can relatively described car body generation row Journey；Bearing spring, its generation are corresponding with the relative shift of the vertical direction of the relatively described car body of the hub bearing support Reaction force；And shock absorber, it produces the relative velocity pair of the vertical direction of the car body relative with the hub bearing support The damping force answered, the suspension link include preceding tranverse connecting rod and rear tranverse connecting rod, and the preceding tranverse connecting rod and rear tranverse connecting rod are carried out The positioning in the beam angle direction of the hub bearing support, and in the end of the car body side and the hub bearing bracket side The flexible body sleeve at least side of end, causes when its straight line advances according to the vertical load of the trailing wheel Pulling force is born, the draft hitch also has rigid adjustable elements, and the rigid adjustable elements are described in the initial stage of turning temporarily general The rigid needle of the elastomer sleeve of preceding tranverse connecting rod relatively increases to the rigidity of the elastomer sleeve of the rear tranverse connecting rod Add.

Accordingly, even in order to produce foreign steamer when being turned according to cross force compliance steer to prenex, lubrication groove to posterior cord side To beam angle change and by the horizontal rigid phase of the rubber bush of preceding tranverse connecting rod for the rubber bush of rear tranverse connecting rod rigidity set It is relatively low in the case of, turn into turning initial stage of problem in vertical force compliance steer, by making the firm of front and rear transverse link Property the interim reversion of difference, so as to prevent the foreign steamer according to caused by vertical force compliance steer to posterior cord, beam angle of the lubrication groove to toe-in Change and improve driving stability.

26th form of the invention is the draft hitch as described in the 25th form, it is characterised in that the rigidity Adjustable elements increase the rigidity of the rubber bush of the preceding tranverse connecting rod initial stage in turning temporarily.

27th form of the invention is the draft hitch as described in the 25th or the 26th form, and its feature exists In the rigidity of rigid adjustable elements rubber bush of tranverse connecting rod after described in turning temporary decrease at initial stage.

Hereby it is possible to reliably obtain the effect above.

28th form of the invention is the draft hitch as described in the 25th or the 26th form, and its feature exists In the rigid adjustable elements reach more than predetermined value and described in making according to the stroke of the bearing spring and the shock absorber The rigidity of rubber bush returns to the state before starting of turning.

Accordingly, in being difficult to produce the dysgenic steady turn state as caused by vertical force compliance steer, horizontal stroke is used To power compliance-steer coefficient foreign steamer can be made to produce beam angle change to posterior cord direction to prenex, lubrication groove and further improve vehicle Driving stability.

29th form of the invention is a kind of draft hitch, it is characterised in that is possessed：Hub bearing support, it is with car Trailing wheel can surround the mode of axletree rotation and support the trailing wheel of vehicle；Suspension link, its both ends are able to joltily Car body and hub bearing support are installed in, and supports the hub bearing support can relatively described car body generation row Journey；Bearing spring, its generation are corresponding with the relative shift of the vertical direction of the relatively described car body of the hub bearing support Reaction force；And shock absorber, it produces the relative velocity pair of the vertical direction of the car body relative with the hub bearing support The damping force answered, and increase of the draft hitch with the vertical force according to the tyre surface for acting on the trailing wheel makes the trailing wheel The vertical force compliance-steer coefficient of prenex side or posterior cord side is diverted to, the draft hitch is also equipped with beam angle change and produces list Member, it produces beam angle change initial stage temporarily in the turning of vehicle, and the direction of beam angle change towards counteracting or suppresses by described perpendicular The direction changed to beam angle caused by power compliance-steer coefficient, the beam angle change generation unit can in turning Iterim Change at initial stage The elastic constant of rigid sleeve is adjusted, the adjustable rigid sleeve is set in a part for the suspension link, by changing elasticity Constant can be such that the hub bearing support is rotated towards prenex direction or posterior cord direction.

Accordingly, by making the elastic constant of the adjustable rigid sleeve in suspension link setting temporarily change initial stage in turning, The rotary hub support of bearing turns into posterior cord direction so as to turn into prenex direction in foreign steamer side in lubrication groove side, so as to preventing or Person suppresses the foreign steamer according to caused by vertical force compliance steer and carried temporarily to the phenomenon that prenex side turns to posterior cord side, lubrication groove temporarily High driving stability.

30th form of the invention is the draft hitch as described in the 29th form, it is characterised in that the beam angle becomes The stroke of bearing spring and the shock absorber described in changing generation unit reaches more than predetermined value and terminates the beam angle and become The generation of change.

As described above, in accordance with the invention it is possible to provide a kind of vertical force that can suppress or offset turning generation at initial stage The trailing wheel draft hitch of the influence of compliance steer.

Brief description of the drawings

Fig. 1 is the stereogram for the embodiment 1 that the draft hitch of the present invention is applied from front side.

Fig. 2 is the stereogram of the draft hitch of embodiment 1 from rear side.

Fig. 3 is the front view of the draft hitch of embodiment 1.

Fig. 4 is the draft hitch rearview of embodiment 1.

Fig. 5 is the top view of the draft hitch of embodiment 1.

Fig. 6 is the upward view of the draft hitch of embodiment 1.

Fig. 7 is the draft hitch side view of embodiment 1.

Fig. 8 is the block diagram of the composition of the control system for the draft hitch for representing embodiment 1.

Fig. 9 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 1.

Figure 10 is the curve map of one of the change of the rear wheel toe angle for the draft hitch for showing schematically embodiment 1.

Figure 11 expressions are the flow charts of the beam angle Corrective control for the embodiment 2 for applying the draft hitch of the present invention.

Figure 12 be the draft hitch for representing embodiment 2 top-support load and driving force correcting value relation curve Figure.

Driving force correcting value at the end of the driving force correction that Figure 13 has been the normalization for the draft hitch for representing embodiment 2 Change curve map.

Figure 14 is the curve map of one of the change of the rear wheel toe angle for the draft hitch for showing schematically embodiment 2.

Figure 15 is the flow chart for representing to apply the beam angle Corrective control of the embodiment 3 of the draft hitch of the present invention.

Figure 16 is the composition for representing to apply the control system of the draft hitch of the embodiment 4 of the draft hitch of the present invention Block diagram.

Figure 17 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 4.

Figure 18 is the composition for representing to apply the control system of the draft hitch of the embodiment 5 of the draft hitch of the present invention Block diagram.

Figure 19 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 5.

Figure 20 is the curve map of one of the change of the rear wheel toe angle for the draft hitch for showing schematically embodiment 5.

Figure 21 is the composition for representing to apply the control system of the draft hitch of the embodiment 6 of the draft hitch of the present invention Block diagram.

Figure 22 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 6.

Figure 23 is the composition for representing to apply the control system of the draft hitch of the embodiment 7 of the draft hitch of the present invention Block diagram.

Figure 24 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 7.

Figure 25 is the curve map of one of the change of the rear wheel toe angle for the draft hitch for showing schematically embodiment 7.

Figure 26 is the block diagram for representing to apply the composition of the control system of the embodiment 8 of the draft hitch of the present invention.

Figure 27 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 8.

Figure 28 is the curve map of one of the change of the rear wheel toe angle for the draft hitch for showing schematically embodiment 8.

Figure 29 is the block diagram for representing to apply the composition of the control system of the embodiment 9 of the draft hitch of the present invention.

Figure 30 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 9.

Figure 31 is the block diagram for representing to apply the composition of the control system of the embodiment 10 of the draft hitch of the present invention.

Figure 32 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 10.

Figure 33 is the curve map of one of the change of the rear wheel toe angle for the draft hitch for showing schematically embodiment 10.

Figure 34 is the block diagram for representing to apply the composition of the control system of the embodiment 11 of the draft hitch of the present invention.

Figure 35 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 11.

Figure 36 is the curve map of one of the change of the rear wheel toe angle for the draft hitch for showing schematically embodiment 11.

Figure 37 is the block diagram for representing to apply the composition of the control system of the embodiment 12 of the draft hitch of the present invention.

Figure 38 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 12.

Figure 39 is the curve map of one of the change of the rear wheel toe angle for the draft hitch for showing schematically embodiment 12.

Symbol description

1 draft hitch

10 subframes

11 front parts

12 rear parts

13 side members

20 supports

Tranverse connecting rod before 30

Tranverse connecting rod after 40

50 upper connecting rods

60 vertical connecting rods

70 damper units

80 stabilising arrangements

100 suspension control systems

110 electric power steerings (EPS) control unit

111 rotation angle sensors

112 torque sensors

120 action control units

121 LH (left side) brake

122 RH (right side) brake

123 hydraulic control units

124 vehicle speed sensor

130 drive control units

131 LH (left side) motor

132 RH (right side) motor

133 inverters

140 beam angle Corrective control units

141 stroke sensors

142 top-support load transducers

150 CAN communication systems

230 4WS (4Wheel Steering) control unit

231 4WS motors

330 adjustable attenuation units

430 damping stroke control units

530 top-support control units

630 adjustable control units

730 active stability control units

830 sleeve rigidity control units

930 top-support rigidity control units

1030 sleeve rigidity control units

Embodiment

It is vertical offsetting in the time of the invention for reaching more than predetermined value by the stroke to suspension after since steering The direction of power compliance steer applies the modes such as the braking and drive force difference of left and right wheels, can suppress or offsets so as to solve to provide one kind The problem of the trailing wheel draft hitch of the influence of the vertical force compliance steer of turning generation at initial stage.

(embodiment 1)

Explanation applies the embodiment 1 of the draft hitch of the present invention below.

The draft hitch of embodiment is the double wish-bone arm type used and set as the trailing wheel of the automobile the minibus such as 4 wheels Suspension.

Fig. 1 is the stereogram of the draft hitch of embodiment 1 from front side.

Fig. 2 is the stereogram of the draft hitch of embodiment 1 from rear side.

Fig. 3 is the front view of the draft hitch of embodiment 1.

Fig. 4 is the draft hitch rearview of embodiment 1.

Fig. 5 is the top view of the draft hitch of embodiment 1.

Fig. 6 is the upward view of the draft hitch of embodiment 1.

Fig. 7 is the draft hitch side view of embodiment 1.

Draft hitch 1 is configured to subframe 10, support 20, preceding tranverse connecting rod 30, rear tranverse connecting rod 40, upper connecting rod 50, vertical Connecting rod 60, damper unit 70, stabilising arrangement 80 etc..

Subframe 10 is the structure member of the base portion for each connecting rod for turning into installation draft hitch 1, by with vibration-proof rubber Subframe sleeve and be installed in the lower rear of car body (not shown).

Subframe 10 is configured to front part 11, rear part 12, side member 13 etc..

Front part 11 is arranged on the leading section of subframe 10, is the beam-like part approximately along vehicle-width direction configuration.

The both ends of front part 11 are by subframe hub being mounted in car body.

Rear part 12 is arranged on the rearward end of subframe 10, is the beam-like part approximately along vehicle-width direction configuration.

The both ends of rear part 12 are by subframe hub being mounted in car body.

Side member 13 is to link part and the rear part near a side end of front part 11 approximately along vehicle fore-and-aft direction The beam-like part of part near 12 side end.

Pair of right and left side member 13 is positioned apart from vehicle-width direction.

Support 20 is the part for storing hub bearing, and the hub bearing can be pivotably supported the wheel for installing wheel Hub.

Draft hitch 1 be supporting support 20 so that support 20 can relative to subframe 10 along predetermined track vertical Direction carries out the device of sweeping action.

Preceding tranverse connecting rod 30, rear tranverse connecting rod 40 are arranged to be erected between the bottom of side member 13 and the bottom of support 20.

Preceding tranverse connecting rod 30, rear tranverse connecting rod 40 separate configuration approximately along vehicle-width direction, and in the fore-and-aft direction of vehicle.

Preceding tranverse connecting rod 30, the both ends of rear tranverse connecting rod 40 can joltily be connected to side by vibrationproof with rubber bush respectively Component 13 and support 20.

Upper connecting rod 50 is arranged to be erected between the top of side member 13 and the top of support 20.

Upper connecting rod 50 is configured approximately along vehicle-width direction.

The both ends of upper connecting rod 50 can joltily be connected to side by vibrationproof with rubber bush and ball-and-socket joint respectively Component 13 and support 20.

Vertical connecting rod 60 is arranged to be erected near the side end of front part 11 between the bottom of support 20.

Vertical connecting rod 60 is configured approximately along vehicle fore-and-aft direction.

The both ends of vertical connecting rod 60 can joltily be connected to front part 11 and branch by vibrationproof with rubber bush respectively Frame 20.

Damper unit 70 is that generation and the shock absorber of damping force corresponding to stretching speed and generation is corresponding with stroke Reactive spring force coil springs units part.

The upper end of damper unit 70 is installed in car body (not shown) by the top-support with vibration-proof rubber.

The bottom of damper unit 70 is installed in rear tranverse connecting rod 40.

Stabilising arrangement 80 be draft hitch 1 left and right produce opposite direction (antiphase) stroke in the case of, produce to Mitigate the anti-tilt device of the reactive spring force in the direction of left and right progressive error.

Stabilising arrangement 80 is formed by spring steel, and the both ends for the stabiliser bar that pars intermedia is configured approximately along vehicle-width direction pass through Connecting rod is connected with the rear tranverse connecting rod 40 of left and right.

In above-mentioned draft hitch 1, the rigidity of each sleeve is set with following cross force compliance-steer coefficient：According to Preceding tranverse connecting rod 30 caused by the cross force caused by turning, rear tranverse connecting rod 40 sleeve elastic deformation, so as to turn Foreign steamer side is prenex tendency, is the tendency of posterior cord in turning lubrication groove side.

Specifically, the rigid phase of the horizontal direction of the rubber bush of preceding tranverse connecting rod 30 is made for the rubber sleeve of rear tranverse connecting rod 40 The rigidity of the horizontal direction of cylinder is relatively low.

In addition, in draft hitch 1, cause that there is the following steering characteristic that jolts by the geometry of each connecting rod class： In the case that trailing wheel produces stroke relative to car body direction (above jumping side) upward, redirect to prenex side, trailing wheel relative to In the case that car body produces stroke towards the direction (rebound side) of decline, posterior cord side is redirect to.

According to above-mentioned cross force compliance-steer coefficient, steering characteristic is jolted so as in vehicle stabilization turning, make foreign steamer Toe-in is redirect to, lubrication groove redirect to posterior cord side.

In addition, draft hitch 1 has so-called wheel center rear dragging posterior cord characteristic, that is, applying to trailing wheel towards wheel During the brake force at center, make trailing wheel to posterior cord directional steering.

On the other hand, in the state of its straight line advance, caused by the vertical load of trailing wheel in preceding tranverse connecting rod 30, rear horizontal stroke The load elongation load of connecting rod 40.

At turning initial stage of vehicle, although the torque for rolling car body is produced, due to stuck (the スティッ of shock absorber Network) etc., the region that the stroke of suspension does not start be present.

In such region, not actual generation cross force compliance steer, the influence for steering of jolting, and turning The vertical load increase of foreign steamer side, in turning lubrication groove side, vertical load is reduced.

Therefore, the tensile load acted in preceding tranverse connecting rod 30, rear tranverse connecting rod 40 increases in turning foreign steamer side, in turning lubrication groove Reduce side.

With regard to preceding tranverse connecting rod 30, the rubber bush of rear tranverse connecting rod 40 lateral stiffness for, as described above, the side of preceding tranverse connecting rod 30 Lateral stiffness than relatively low, therefore as caused by the change of such tensile load support 20 displacement, on rear side of the ratio of front side Greatly.

Therefore, produce turning foreign steamer and redirect to posterior cord side, the vertical force compliance steer that turning lubrication groove redirect to prenex side is special Property.

As described above, at the initial stage of turning, the influence of vertical force compliance steer is very strongly shown, on the other hand, almost The influence of cross force compliance steer and steering of jolting is not shown, and therefore, turning foreign steamer is to posterior cord side, turning lubrication groove to toe-in Side turns to.

Then, damper unit 70 starts stroke, horizontal if starting to act on cross force in preceding tranverse connecting rod 30, rear tranverse connecting rod 40 Influence to power compliance steer, steering of jolting becomes strong, and turning foreign steamer goes back to prenex side, turning lubrication groove goes back to posterior cord side.

, can be to the driving stability of vehicle in this way, if trailing wheel is diverted into opposite direction at turning initial stage and steady turn Property produce harmful effect.

Therefore, in embodiment 1, the direction of vertical force compliance steer for carrying out producing mitigation or offset turning initial stage The beam angle Corrective control of beam angle change.

Illustrate the point below.

Suspension control system 100 is configured to electric power steering (EPS) control unit 110, action control unit 120th, drive control unit 130, beam angle Corrective control unit 140 etc..

These units can be in communication with each other for example, by a kind of CAN communication system 150 as Che Load LAN.

EPS control units 110 are that control corresponds to by the torque of driver's input to produce the electronic of steering power torque The unit of power steering gear.

Rotation angle sensor 111, torque sensor 112 are connected in EPS control units 110.

Rotation angle sensor 111 is used to detect the current steering angle (steering wheel angle) of steering.

Torque sensor 112 is used to detect the input torque for being input to steering by driver.

Action control unit 120 is used in the case where the action of oversteering, understeer etc. occurs for vehicle, produces left The brake force difference of right wheel suppresses the torque in these directions acted to produce.

Action control unit 120 is used to control hydraulic control unit (HCU) 123, the energy of hydraulic control unit (HCU) 123 Enough control respectively is supplied to LH brakes 121, the brake hydraulic of RH brakes 122.

In addition, connecting vehicle speed sensor 124 in action control unit 120, the vehicle speed sensor 124 exports the rotation of wheel Pulse signal corresponding to speed, so as to obtain speed.

Drive control unit 130 is used for the driving for by the motor individually set up apply driving force in left and right trailing wheel Control.

Drive control unit 130 is by controlling respectively by the inversion of driving power supply LH motors 131, RH motors 132 Device 133 is so as to individually controlling the driving force of left and right trailing wheel.

The in-wheel motor that LH motors 131, RH motors 132 are e.g. set respectively in the hub portion of left and right trailing wheel, but not It is defined in this or drives the composition of left and right trailing wheel by power transmission shaft from subframe 10.

Beam angle Corrective control unit 140 starts for going out turning in infomation detection of the basis from the grade of EPS control units 110 In the case of, beam angle Corrective control is carried out, the beam angle Corrective control produces towards suppression or offsets above-mentioned vertical force temporarily The beam angle change in the direction of compliance steer.

Stroke sensor 141, top-support load transducer 142 are connected in beam angle Corrective control unit 140.

Stroke sensor 141 is used for the stroke of the shock absorber of the damper unit 70 of detection left and right respectively.

Top-support load transducer 142 is used for detection respectively and acted in the setting of the upper end of the damper unit 70 of left and right Top-support vertical direction load.

Hereinafter, illustrate successively according to each step.

＜ steps S01：Obtain steering wheel angle θ s ＞

Beam angle Corrective control unit 140 obtains steering wheel angle θ s from EPS control units 110.

Then, into step S02.

＜ steps S02：Calculate steering speed θ s ' ＞

Beam angle Corrective control unit 140 calculates the steering wheel angle θ s obtained in step S01 progress time diffusions Steering speed θ s '.

Then, into step S03.

＜ steps S03：Judge speed ＞

Beam angle Corrective control unit 140 obtains vehicle velocity V from action control unit 120.

Then, it is below upper limit vehicle velocity V max set in advance in current vehicle velocity V and is more than lower limit speed Vmin In the case of, it is judged as falling in the vehicle speed range that should carry out beam angle Corrective control, into step S04.

In the case of other, it is judged as falling in the vehicle speed range that should not carry out beam angle Corrective control, terminates a series of place Manage (return).

＜ steps S04：Judge that steering starts judgement symbol ＞

Beam angle Corrective control unit 140 steering start judgement symbol value of statistical indicant be 0 in the case of in order to differentiate steering Whether start and enter step S05.

Steering start judgement symbol value be 1 in the case of, it is believed that steering has begun to, into step S09.

＜ steps S05：Judge interference ＞

The steering wheel angle θ s that beam angle Corrective control unit 140 obtains in step S01 from EPS control units 110 with obtaining The driver's input torque Ts taken product be predetermined threshold value more than in the case of, it is believed that be driver autotelic steering behaviour Make, into step S06.

In other cases, even if steering wheel angle θ s etc. are changed, also it is judged as YES as caused by interference, terminates a system The processing (return) of row.

＜ steps S06：Judge steering speed absolute value ＞

Beam angle Corrective control unit 140 is by the steering speed θ s ' calculated in step S02 absolute value with presetting Threshold value compare.

In the case where steering speed θ s ' absolute value is more than threshold value, into step S07, in other cases, terminate A series of processing (return).

＜ steps S07：Judge to rotate forward, turn round ＞

Steering wheel angle θ s that beam angle Corrective control unit 140 obtains in step S01 and calculated in step S02 In the case that steering speed θ s ' product is just (bigger than 0), be judged as being in makes the increased rotating forward of rudder angle according to driver's operation (cut り and increase), into step S08.

On the other hand, in other cases, it is judged as the revolution (cutting り Reversal) in rudder angle reduction, terminates a series of Processing.

＜ steps S08：Set steering to start judgement symbol and put ＞

The value of statistical indicant that beam angle Corrective control unit 140 starts steering judgement symbol is changed into 1 from 0, so as to set mark.

Then, into step S09.

＜ steps S09：Driving force Corrective control ＞

Beam angle Corrective control unit 140 sends instruction to drive control unit 130, it is driven power Corrective control.

Driving force Corrective control increases the driving force of turning foreign steamer so that according to wheel center rear dragging posterior cord characteristic forward Beam directional steering, and the driving force of turning lubrication groove is reduced, make it to posterior cord directional steering.

Then, into step S10.

＜ steps S10：Detect stroke change ＞

Beam angle Corrective control unit 140 detects the stroke of left and right damper unit 70 using stroke sensor 141.

Then, into step S11.

＜ steps S11：Judge foreign steamer skidding journey ＞

Change of the beam angle Corrective control unit 140 in the stroke from straight ahead of the damper unit 70 of turning foreign steamer side Change amount be it is more than threshold value set in advance in the case of, be judged as according to cross force compliance-steer coefficient, jolt steering characteristic, fill Divide there occurs foreign steamer to toe-in, lubrication groove changes to the beam angle of posterior cord, into step S12.

In other cases, it is judged as needing to continue beam angle Corrective control, terminates a series of processing (return).

＜ steps S12：Reset steering and start judgement symbol ＞

The value of statistical indicant that beam angle Corrective control unit 140 starts steering judgement symbol is set to 0 and is zeroed out, into step S13。

＜ steps S13：Terminate driving force correction ＞

Beam angle Corrective control unit 140 terminates driving force correction, terminates a series of processing.

The longitudinal axis represents the beam angle of turning foreign steamer, and top represents prenex side.

Transverse axis represents the time calculated since steering.

In addition, being shown in broken lines the record not being driven in the case of power Corrective control, progress is shown in solid lines Record in the case of driving force Corrective control.

In addition, though in the toe-in of turning lubrication groove side, posterior cord reversion, but also show that substantially the same record.

In the case where not being driven power Corrective control, the beam angle of trailing wheel is first according to vertical force compliance-steer coefficient First to posterior cord direction change, when the stroke change and/or cross force for producing suspension thereafter, according to steering characteristic and the horizontal stroke of jolting Change to power compliance-steer coefficient to prenex side.

On the other hand, according to embodiment 1, by above-mentioned driving force Corrective control, can be produced temporarily initial stage in turning Change to the beam angle of prenex side, can prevent from turning to posterior cord side temporarily, so as to improve driving stability.

In addition, in turning lubrication groove side, similarly, can prevent from turning to prenex side temporarily before turning to posterior cord side.

(Embodiment 2)

Then, the embodiment 2 for applying the draft hitch of the present invention is illustrated.

In each embodiment described below, for using same symbol with the actually same key element of embodiment before And the description thereof will be omitted, mainly illustrate distinctive points.

The draft hitch of embodiment 2 is to be offset to erect according to the driving force Corrective control of left and right trailing wheel similarly to Example 1 The device of influence to power compliance steer, it is characterised in that in order to suppress as switch that driving force controls and caused by beam drastically Angle changes, and sets driving force correcting value corresponding to top-support load, and delay the driving force correcting value at the end of correction Slow change.

Figure 11 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 2.

Hereinafter, illustrate successively according to each step.

＜ steps S01：Obtain steering wheel angle θ s ＞

Then, into step S02.

＜ steps S02：Calculate steering speed θ s ' ＞

Then, into step S03.

＜ steps S03：Judge speed ＞

In the case of other, it is judged as falling in the vehicle speed range that should not carry out beam angle Corrective control, into step S09.

＜ steps S04：Judge that steering starts judgement symbol ＞

Steering start judgement symbol value be 1 in the case of, it is believed that steering has begun to, into step S10.

＜ steps S05：Interference judges ＞

In other cases, even if steering wheel angle θ s etc. are changed, also it is judged as YES as caused by interference, into step S09。

＜ steps S06：Judge steering speed absolute value ＞

In the case where steering speed θ s ' absolute value is more than threshold value, into step S07, in other cases, enter Step S09.

＜ steps S07：Judge to rotate forward, turn round ＞

Steering wheel angle θ s that beam angle Corrective control unit 140 obtains in step S01 and calculated in step S02 In the case that steering speed θ s ' product is just (bigger than 0), be judged as being in makes the increased rotating forward of rudder angle according to driver's operation In, into step S08.

On the other hand, in other cases, it is judged as in the revolution in rudder angle reduction, into step S09.

＜ steps S08：Set steering to start judgement symbol and put ＞

Then, into step S10.

＜ steps S09：Store top-support load ＞

Beam angle Corrective control unit 140 stores the current top-support that top-support load transducer 142 detects and carried Lotus (F0).

Then, a series of processing (return) is terminated.

＜ steps S10：Judge foreign steamer stroke mark ＞

Whether beam angle Corrective control unit 140 is producing the outer of the mark of stroke as the damper unit 70 for representing foreign steamer side In the case that the value of statistical indicant of wheel stroke mark is 0, into step S11, in other cases, into step S17.

＜ steps S11：Obtain top-support load ＞

Beam angle Corrective control unit 140 obtains working as the damper unit 70 of foreign steamer side from top-support load transducer 142 Preceding top-support load.

Then, into step S12.

＜ steps S12：Judge foreign steamer stroke ＞

Beam angle Corrective control unit 140 is in the foreign steamer side that stroke sensor 141 detects from straight ahead state In the case that stroke variable quantity is smaller than threshold value set in advance, it is judged as needing carrying out beam angle Corrective control, into step S13, In other cases, in order that beam angle Corrective control terminates and enters step S16.

＜ steps S13：Driving force Corrective control ＞

At this moment the driving force incrementss of foreign steamer side and the driving force decrement of lubrication groove side correspond to top-support load And change.

As shown in figure 12, driving force correcting value is set to the increase corresponding to top-support load and increased.

Then, into step S14.

<Step S14：Store correcting value ＞

The correcting value γ that the storage of beam angle Corrective control unit 140 corrects according to the driving force being currently executing.

Then, into step S15.

＜ steps S15：Storage time index ＞

Beam angle Corrective control unit 140 will store at current time as time index t0.

Then, a series of processing (return) is terminated.

＜ steps S16：Foreign steamer stroke mark ＞ is set

The value of statistical indicant of foreign steamer stroke mark is set to 1 by beam angle Corrective control unit 140, so as to set mark.

Then, into step S17.

＜ steps S17：Obtain time index ＞

As time index t at the time of beam angle Corrective control unit 140 obtains current.

Then, into step S18.

＜ steps S18：Calculate corrected value ＞

Beam angle Corrective control unit 140 calculates correcting value (the outer wheel drive force increase of driving force correction using following formula 1 Amount, inner-wheel driving power decrement).

Corrected value=γ F ((t-t0)/T) (formula 1)

Here, F (x) is in order that the function that correcting value is gradually decreased and set.

As shown in figure 13, function F (x), corresponding to the time course (0~1) normalized, the correcting value normalized is made It is slowly varying from 1 to 0.

In addition, T represents to make correcting value gradually decrease the time untill being finally 0.

Then, into step S19.

＜ steps S19：Correct driving force ＞

Beam angle Corrective control unit 140 corrects left and right trailing wheel using the driving force correcting value calculated in step S19 Driving force.

Then, into step S20.

＜ steps S20：Judge correction end time ＞

Beam angle Corrective control unit 140 judges whether driving force correction has substantially terminated using following formula 2.

T-t-t0 ＜ 0 (formula 2)

In the case where meeting formula 2, it is believed that driving force correction has substantially terminated, and terminates a series of processing (return).

On the other hand, in the case of the formula that is unsatisfactory for 2, into step S21.

＜ steps S21：Reset steering and start judgement symbol ＞

The value of statistical indicant that beam angle Corrective control unit 140 starts steering judgement symbol is set to 0, resets mark.

Then, into step S22.

＜ steps S22：Terminate driving force correction ＞

Beam angle Corrective control unit 140 terminates driving force correction and enters step S23.

＜ steps S23：Reset foreign steamer stroke mark ＞

The value of statistical indicant of foreign steamer stroke mark is set to 0 by beam angle Corrective control unit 140, resets mark.

Then, a series of processing is terminated.

In example 2, the correcting value of driving force correction is set to correspond to top-support load and increased, and passes through Correcting value is gradually decreased at the end of correction, so as to make the change of beam angle steady, improves driving stability, and mitigate Give the sense of discomfort of driver.

(embodiment 3)

Then, the embodiment 3 for applying the draft hitch of the present invention is illustrated.

The draft hitch of embodiment 3 is come instead of the drive of the left and right trailing wheel of embodiment 1 using the brake force difference of left and right trailing wheel Differential force, so as to eliminate turning initial stage vertical force compliance steer influence device.

Such brake force difference can be produced using action control unit 120 and HCU 123.

Figure 15 is the flow chart of the beam angle Corrective control for the draft hitch for representing embodiment 3.

As shown in figure 15, in embodiment 3, the brake force of foreign steamer is made increase (in the case of not braking in step 09 Then produce brake force), and reduce the brake force correction control of the brake force (not corrected in the case of not braking) of lubrication groove The aspect of system, and terminate in step s 13 the brake force Corrective control aspect and Fig. 9 shown in embodiment 1 control not Together.

In embodiment 3 as described above, the effect substantially identical with the effect of the above embodiments 1 can be also obtained.

It should be noted that in embodiment 3, brake force correction amount can correct quality entity with the driving force of embodiment 2 On be similarly set to correspond to top-support load and increase, and brake force correct at the end of, brake force school can be made Positive quantity is slowly varying.

In this case, the effect substantially identical with the effect of the above embodiments 2 can be obtained.

(embodiment 4)

Then, the embodiment 4 for applying the draft hitch of the present invention is illustrated.

The draft hitch of embodiment 4 is eliminated using being made the 4 of rear-axle steering to take turns steering (4WS) systems according to driver The device of the influence of the vertical force compliance steer at turning initial stage.

Figure 16 is the block diagram of the composition of the control system for the draft hitch for representing embodiment 4.

The suspension control system of embodiment 4 has 4WS control units 230, to replace the drive control unit of embodiment 1 130 etc..

The control of 4WS control units 230 makes the beam angle of left and right trailing wheel forcibly change the motor driver i.e. 4WS horses of (steering) Up to 231.

As described in Figure 17, in example 4, foreign steamer is carried out in step S09 to turn to posterior cord side to prenex side, lubrication groove Beam angle Corrective control, also, the control of the embodiment 1 in terms of step S13 terminates the beam angle Corrective control and shown in Fig. 9 is not Together.

In embodiment 4 as described above, by carrying out foreign steamer to prenex side, lubrication groove using 4WS systems at the initial stage of turning The beam angle Corrective control turned to posterior cord side, it can prevent from causing foreign steamer to turn to posterior cord side from vertical force compliance steer, improve Driving stability.

It should be noted that in example 4, the correcting value of beam angle can correct quality entity with the driving force of embodiment 2 Similarly it is set to correspond to top-support load and increase, and can delays beam angle correcting value at the end of beam angle corrects Slow change.

In this case, the substantially identical effect of the effect of the above embodiments 2 can be obtained.

(embodiment 5)

Then, the embodiment 5 for applying the draft hitch of the present invention is illustrated.

The draft hitch of embodiment 5 is the influence that the vertical force compliance steer at turning initial stage is eliminated using adjustable shock absorber Device, the adjustable shock absorber from outside by by applying magnetic field so that MR (magnetorheological) fluid that viscoelastic property changes is made For working fluid.

Figure 18 is the block diagram of the composition of the control system for the draft hitch for representing embodiment 5.

The suspension control system of embodiment 5 has adjustable attenuation unit 330, to replace the drive control unit of embodiment 1 130 etc..

Adjustable attenuation unit 330 controls the magnetic field of the shock absorber application to the damper unit 70 of left and right to become attenuation characteristic Change.

As shown in figure 19, in embodiment 5, enter to exercise in step S09 foreign steamer side shock absorber damping force reduce decline Subtract power Corrective control, and the control of the embodiment 1 in terms of step S13 terminates the damping force Corrective control and shown in Fig. 9 It is different.

In the case of without damping force Corrective control, the beam angle of trailing wheel according to vertical force compliance-steer coefficient first to Posterior cord direction change, then when producing the stroke change of suspension and/or cross force, according to steering characteristic and the cross force of jolting Compliance-steer coefficient changes to prenex side.

When carrying out damping force Corrective control, by reducing the shock absorber damping force of turning foreign steamer, so as to promote vibration damping The stroke at initial stage of unit 70, steering characteristic generation of jolting can be made in early days, shortening is shown by vertical force compliance-steer coefficient Caused by influence during, improve driving stability.

(embodiment 6)

Then, the embodiment 6 for applying the draft hitch of the present invention is illustrated.

The draft hitch of embodiment 6 is the Active suspension for being capable of forcibly telescopic vibration absorber stroke, by controlling shock absorber Stroke eliminates the influence of the vertical force compliance steer at turning initial stage.

Figure 21 is the block diagram of the composition of the control system for the draft hitch for representing embodiment 6.

The suspension control system of embodiment 6 has shock absorber stroke controlling unit 430, to replace the driving control of embodiment 1 Unit 130 processed etc..

Shock absorber stroke controlling unit 430 controls the driver for making the shock absorber of left and right damper unit 70 flexible and controls row Journey.

As shown in figure 22, in embodiment 6, enter to exercise the stroke that the stroke of foreign steamer side shock absorber shortens in step S09 Corrective control, also, terminate in step s 13 the trip Corrective control aspect and Fig. 9 shown in embodiment 1 control not Together.

In addition, the top-support load of damper unit 70, in step s 11 top-support load are detected in step slo Enter step S12 in the case of bigger than threshold value, in other cases, the aspect for terminating a series of processing (return) is also different.

, can by forcibly shortening the stroke of foreign steamer side shock absorber initial stage in turning in embodiment 6 as described above Steering of jolting is produced in early stage, the phenomenon that can prevent the foreign steamer caused by vertical force compliance steer from being turned to posterior cord side, is improved Driving stability.

(embodiment 7)

Then, the embodiment 7 for applying the draft hitch of the present invention is illustrated.

The draft hitch of embodiment 7 is that have to stretch in the direction of principal axis of shock absorber by filling the fluid of air etc. Top-support, by control top-support so as to eliminate turning initial stage vertical force compliance steer influence device.

Figure 23 is the block diagram of the composition of the control system for the draft hitch for representing embodiment 7.

The suspension control system of embodiment 7 has top-support control unit 530, to replace the drive control of embodiment 1 Unit 130 etc..

Top-support control unit 530 by control to the left and right the top-support of damper unit 70 air inject, so as to Top-support is set to be stretched in the direction of principal axis of shock absorber.

As shown in figure 24, in embodiment 7, inject air in foreign steamer side roof part support in step S09 and enter to exercise row Cheng Shenchang stroke Corrective control, and terminate in step s 13 the trip Corrective control aspect and Fig. 9 shown in embodiment 1 control is different.

In the case of without stroke Corrective control, the beam angle of trailing wheel according to vertical force compliance-steer coefficient first backward Beam direction change, when the stroke change for hereafter producing suspension and/or during cross force, according to jolt steering characteristic and cross force it is soft Sexual deviation characteristic changes to prenex side.

In the case where having carried out stroke Corrective control, extend top-support initial stage in turning, make to the defeated of shock absorber Enter load increase, release the stuck of damper unit 70 in early stage and promote stroke at initial stage, turn so as to produce to jolt in early stage To characteristic, during shortening shows the influence as caused by vertical force compliance-steer coefficient, driving stability is improved.

(embodiment 8)

Then, the embodiment 8 for applying the draft hitch of the present invention is illustrated.

The draft hitch of embodiment 8 is that stabilising arrangement 80 rolls rigid adjustable rigid stabilizer for that can change, according to Roll rigidity control and eliminate the device of the influence of the vertical force compliance steer at turning initial stage.

Figure 26 is the block diagram of the composition of the control system for the draft hitch for representing embodiment 8.

The suspension control system of embodiment 8 has adjustable control unit 630, to replace the driving control of embodiment 1 Unit 130 processed etc..

Adjustable control unit 630 controls the driver not shown set in stabilising arrangement 80, inclination is rigidly become Change.

As shown in figure 27, in embodiment 8, enter in step S09 and exercise the inclination rigidity for rolling rigidity reduction (softening) Corrective control, and in step s 13, terminate the inclination rigidity Corrective control aspect and Fig. 9 shown in embodiment 1 control It is different.

The change of the rear wheel toe angle in the case of making the holding of inclination stiff stability low-level is represented in Figure 28 with double dot dash line.

In the case of without rolling rigid Corrective control, the beam angle of trailing wheel according to vertical force compliance-steer coefficient first To posterior cord direction change, when the stroke change and/or cross force for hereafter producing suspension, according to steering characteristic and the transverse direction of jolting Power compliance-steer coefficient changes to prenex side.

In the case where having carried out the rigid Corrective control of inclination, make the side of inclination rigidity reduction promotion car body initial stage in turning Incline, release the stuck of damper unit 70 in early stage and promote stroke at initial stage, so as to produce the steering characteristic that jolts, contracting in early stage It is short show as caused by vertical force compliance-steer coefficient influence during, improve driving stability.

In addition, after fully producing jolt steering and cross force compliance steer, by making inclination rigidly return to shape at initial stage State is so as to improving driving stability.

(embodiment 9)

Then, the embodiment 9 for applying the draft hitch of the present invention is illustrated.

For the draft hitch of embodiment 9, stabilising arrangement 80 is that application makes its torsion by splitting stabiliser bar in pars intermedia Turn the torque in direction, so as to the active stabilizer as the torque that can produce vehicle roll direction.

In embodiment 9, by controlling active stabilizer, so as to eliminate turning initial stage vertical force compliance steer shadow Ring.

Figure 29 is the block diagram of the composition of the control system for the draft hitch for representing embodiment 9.

The suspension control system of embodiment 9 has active stability control unit 730, to replace the drive control of embodiment 1 Unit 130 etc..

Active stability control unit 730 controls the driver (not shown) set in stabilising arrangement 80, to enter enforcement or so Stabiliser bar relative torsion control.

As shown in figure 30, in embodiment 9, carry out stablizing rod twisting control according to active stabilizer in step S09, So as to promote the inclination action in the direction jumped on foreign steamer side, also, terminate the aspect of the stable rod twisting control in step s 13 It is different from the control of the embodiment 1 shown in Fig. 9.

In embodiment 9 as described above, inclination is substantially forcibly produced by using active stabilizer, produces suspension Stroke, so as to produce steering of jolting in early stage, prevent from making foreign steamer turn to posterior cord side according to vertical force compliance steer, improve Driving stability.

(embodiment 10)

Then, the embodiment 10 for applying the draft hitch of the present invention is illustrated.

The draft hitch of embodiment 10 possesses and can changed in the car body side rubber bush in preceding tranverse connecting rod 30, rear tranverse connecting rod 40 (the adjustable rigid sleeve is to enclose by applying magnetic field from outside to make viscoplasticity to the adjustable rigid rubber bush of change elastic constant The hydraulic seal sleeve of the MR fluids of characteristic variations, elastic constant can be changed corresponding to the application state in magnetic field), pass through control Its elastic constant is so that vertical force compliance-steer coefficient inverts.

Figure 31 is the block diagram of the composition of the control system for the draft hitch for representing embodiment 10.

The suspension control system of embodiment 10 has sleeve rigidity control unit 830, to replace the drive control of embodiment 1 Unit 130 etc..

The elastic constant of the car body side rubber bush of tranverse connecting rod 30 before sleeve rigidity control unit 830 controls.

As shown in figure 32, in embodiment 10, enter to exercise the preceding tranverse connecting rod 30 of foreign steamer side and lubrication groove side in step S09 Rubber bush the increased control of elastic constant, also, in step s 13, terminate the aspect and Fig. 9 of elastic constant control The control of shown embodiment 1 is different.

In embodiment 10, controlled by carrying out the elastic constant of sleeve of above-mentioned preceding tranverse connecting rod 30, preceding tranverse connecting rod 30 The poor rigidity of the rubber bush of rubber bush and rear tranverse connecting rod 40 inverts during beyond the initial stage of turning is with it.

As a result, in embodiment 10, compared with the situation without so controlling, vertical force compliance steer can be made Characteristic inverts.

Therefore, according to embodiment 10, it can prevent that foreign steamer turns to and lubrication groove is to prenex side to posterior cord side at the initial stage of turning Turn to, improve driving stability.

It should be noted that the elastic constant of the sleeve of rear tranverse connecting rod 40 is set to reduce temporarily to replace making preceding tranverse connecting rod 30 The elastic constant of sleeve increases temporarily, or after making while the elastic constant of the sleeve in tranverse connecting rod before making 30 increases temporarily it is horizontal The elastic constant of the sleeve of connecting rod 40 is reduced temporarily, can also obtain substantially the same effect.

(embodiment 11)

Then, the embodiment 11 for applying the draft hitch of the present invention is illustrated.

Top-support of the draft hitch of embodiment 11 in the upper end of damper unit 70 possesses and can change elastic constant Adjustable rigid top-support, mitigate the influence of vertical force compliance steer by controlling its elastic constant.

Figure 34 is the block diagram of the composition of the control system for the draft hitch for representing embodiment 11.

The suspension control system of embodiment 11 has top-support rigidity control unit 930, to replace the driving of embodiment 1 Control unit 130 etc..

Top-support rigidity control unit 930 controls the elastic constant of the top-support of damper unit 70.

As shown in figure 35, in embodiment 11, enter to exercise the top-support of foreign steamer side and lubrication groove side in step S09 The increased control of elastic constant, and terminate in step s 13 the elastic constant control aspect and Fig. 9 shown in embodiment 1 Control it is different.

In embodiment 11, controlled by the elastic constant for carrying out above-mentioned top-support, make the initial stage to damper unit 70 defeated Enter increase, releasing the stuck of damper unit 70 in early stage promotes stroke at initial stage, special so as to produce steering of jolting in early stage Property, during shortening shows the influence as caused by vertical force compliance-steer coefficient, improve driving stability.

(embodiment 12)

Then, the embodiment 12 for applying the draft hitch of the present invention is illustrated.

The draft hitch of embodiment 12 by preceding tranverse connecting rod 30, rear tranverse connecting rod 40, upper connecting rod 50, vertical connecting rod 60 end Make by changing elastic constant (increase is reduced) support 20 can be made to rotate to the one of prenex side in each sleeve possessed Partial sleeves (prenex side particular sleeve) and support 20 can be made to rotate to a part of sleeve of posterior cord side (posterior cord side is specific Sleeve) elastic constant change, thus mitigate vertical force compliance steer influence.

The change of the elastic constant of such sleeve can for example apply magnetic field so that viscoplasticity by using having enclosed Fluid-tight sleeve of MR fluids of characteristic variations etc. is realized.

Figure 37 is the block diagram of the composition of the control system for the draft hitch for representing embodiment 12.

There is the suspension control system of embodiment 12 sleeve rigidity control unit 1030 to replace the drive control of embodiment 1 Unit 130 etc..

Sleeve rigidity control unit 1030 controls above-mentioned prenex side particular sleeve, the elastic constant of posterior cord side particular sleeve.

As shown in figure 38, in embodiment 12, enter to exercise in step S09 the prenex side particular sleeve of turning foreign steamer side with And the control of the elastic constant change of the posterior cord side particular sleeve of turning lubrication groove side, and it is normal to terminate the elasticity in step s 13 The aspect of number change is different from the control of the embodiment 1 shown in Fig. 9.

Support 20 is set to go to prenex side in turning foreign steamer sidespin by the rigidity control of link rod sleeve in embodiment 12 Posterior cord side is gone in turning lubrication groove sidespin, the influence thus, it is possible to suppress vertical force compliance steer, improves driving stability.

(variation)

The present invention is not limited to embodiment as described above, can carry out various deformations and/or change, these Each fall within the range of the technology of the present invention.

(1) composition of draft hitch is not limited to above-described embodiment, can carry out appropriate change.For example, draft hitch Form be not limited to embodiment as double wish-bone arm type or pillar, multi link formula, corbel type etc. other shapes Formula.In addition, also there is no particular limitation for the composition of control system.

(2) in embodiment 1,2, drive is produced in left and right trailing wheel using the motor for individually applying driving force to left and right trailing wheel Differential force, but be not limited thereto, it is poor driving force can also to be produced according to other method.

For example, can will common driving engine and/or left and right trailing wheel electro-motor output by changing left and right after The torque distribution of wheel and the torque vector distributor that transmits is allocated and to produce driving force poor.

(3) can be used together if embodiment 1,2 is according to the beam angle control of driving force difference and if embodiment 3,4 is according to braking The beam angle control of power difference.

For example, apply driving force in the case of the draft hitch with rear dragging toe-in characteristic or in foreign steamer, and And apply the composition of brake force in lubrication groove.

(4) in embodiment 1~4 it is the draft hitch with wheel center rear dragging posterior cord characteristic, but the present invention also can It is enough to be applied to the draft hitch with wheel center rear dragging toe-in characteristic.In this case, make in the control of lubrication groove and foreign steamer Hold reversion.

(5) each embodiment is based on the end beam angle Corrective control such as shock absorber stroke, top-support load, but is not limited to This, can also terminate beam angle Corrective control by other method.For example, can after turning starts the scheduled time tie control Beam.In addition, making the method for the slowly varying situation of controlled quentity controlled variable, also there is no particular limitation.

(6) each embodiment produces brake force using the motor for individually applying brake force in left and right trailing wheel in left and right trailing wheel Difference, but be not limited thereto, it can also be controlled according to brakes such as ESC to produce brake force difference.In this case, connecing Place acts on brake force, therefore changes control content corresponding to the beam angle variation characteristic of earth point rear dragging.For example, draft hitch 1 has earth point rear dragging toe-in characteristic, therefore by increasing the brake force of turning foreign steamer, can suppress by the vertical of initial stage of turning Posterior cord caused by power turns to.

Claims

1. a kind of draft hitch, it is characterised in that possess：

Hub bearing support, it supports the trailing wheel of vehicle so that the trailing wheel of vehicle can surround axletree rotation；

Suspension link, its both ends are able to joltily be installed in car body and hub bearing support, and support the wheel hub The support of bearing can relatively described car body generation stroke；

Bearing spring, its generation are corresponding with the relative shift of the vertical direction of the relatively described car body of the hub bearing support Reaction force；With

Shock absorber, it produces decay corresponding with the relative velocity of the vertical direction of the relatively described car body of the hub bearing support Power,

And increase of the draft hitch with the vertical force according to the tyre surface for acting on the trailing wheel makes the rear-axle steering extremely Prenex side or the vertical force compliance-steer coefficient of posterior cord side,

The draft hitch is also equipped with beam angle change generation unit, and it produces beam angle change initial stage temporarily in the turning of vehicle, should The direction of the beam angle change direction that the beam angle as caused by the vertical force compliance-steer coefficient changes towards counteracting or suppression,

The beam angle change generation unit has support rigidity control unit, and the support rigid element increases initial stage temporarily in turning Add the rigidity of the adjustable rigid elasticity body support frame between the upper end for being arranged on the shock absorber and car body.

2. draft hitch as claimed in claim 1, it is characterised in that

The support rigidity control unit reaches more than predetermined value according to the stroke of the shock absorber and makes the adjustable rigid bullet Property body support frame rigidity return to turn start before state.