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CN106364478B - A kind of automatic transmission shift control method for correcting for improving emergency brake of vehicle performance - Google Patents

A kind of automatic transmission shift control method for correcting for improving emergency brake of vehicle performance Download PDF

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Publication number
CN106364478B
CN106364478B CN201610913414.2A CN201610913414A CN106364478B CN 106364478 B CN106364478 B CN 106364478B CN 201610913414 A CN201610913414 A CN 201610913414A CN 106364478 B CN106364478 B CN 106364478B
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engine
speed
gear
braking
vehicle
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CN106364478A (en
Inventor
夏光
施信信
谢海
闫瑞琦
郑友
滑杨莹
郭东云
杜克
邹斌
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Hefei University of Technology
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Hefei University of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
    • B60W10/11—Stepped gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W2050/0001—Details of the control system
    • B60W2050/0002—Automatic control, details of type of controller or control system architecture
    • B60W2050/0014—Adaptive controllers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W2050/0001—Details of the control system
    • B60W2050/0043—Signal treatments, identification of variables or parameters, parameter estimation or state estimation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0638—Engine speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/10—Change speed gearings
    • B60W2510/1005—Transmission ratio engaged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0644—Engine speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/10—Change speed gearings
    • B60W2710/1005—Transmission ratio engaged

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Human Computer Interaction (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The invention discloses a kind of automatic transmission shift control method for correcting for improving emergency brake of vehicle performance, it is characterised in that：When the vehicle for equipping automatic transmission carries out emergency braking, by the gear amendment of automatic transmission and the adjustment of rotational speed of engine, using the braking moment characteristic of engine, braking distance when shortening emergency brake of vehicle, the abrasion for reducing braking system.

Description

A kind of automatic transmission shift control method for correcting for improving emergency brake of vehicle performance
Technical field
The present invention relates to a kind of automobile automatic gear shift control method, specifically a kind of raising emergency brake of vehicle The automatic transmission shift control method for correcting of performance.
Background technology
Fluid drive gearshift control technology is the key technology of vehicle speed variation control, and fluid drive gearshift control mainly includes One-parameter, two parameters, three parameters or even four parameters basic shift control method, shifted gears with improving fuel economy and improving Ride comfort.
Driver has different manipulations to be intended in vehicle processes are driven, when an emergency situation is encountered needs emergency braking, The basic shift control method of fluid drive is set according to vehicle at the uniform velocity driving intention, can not be taken according to emergency braking driving intention Corresponding shift control strategy and gearshift execution method perform operation to meet current desired gear and gearshift, lead to vehicle row Sail safety reduction.
Vehicle needs very big braking moment in emergency braking, and the system for relying solely on vehicle provides brake force, What is then needed carries out high braking moment design, and braking system wear and heat fading phenomenon are apparent, increase system to braking system The use cost of dynamic system, reduces the safety of vehicle.
Invention content
The present invention proposes a kind of raising emergency brake of vehicle performance to avoid the shortcoming present in the above-mentioned prior art Automatic transmission shift control method for correcting, to using engine braking moment characteristic, pass through the gear of automatic transmission Position correct and engine adjustment of rotational speed, shorten emergency brake of vehicle when braking distance, reduce braking system abrasion, so as to Improve braking safety when vehicle carries out emergency braking.
The present invention to achieve the above object of the invention, adopts the following technical scheme that：
The present invention it is a kind of improve emergency brake of vehicle performance automatic transmission shift control method for correcting the characteristics of be by Following steps carry out：
Step 1 determines the minimum speed n that engine effectively works during emergency brake of vehicleminWith maximum (top) speed nmax；
Step 2, the lower rotation speed limit n for determining engine best effort during emergency brake of vehicledownWith rotating speed upper limit nup；
Step 3, when the engine speed n be less than ndownAnd more than or equal to nmin, the transmission gear d be more than 1 and During less than or equal to highest gear number m, transmission gear potential drop one is kept off, and engine speed is made to be promoted to n after the completion of downshiftup,
Step 4, when the engine speed n be less than nmin, and the transmission gear d be equal to 1 when, transmission gear become For neutral gear.
The characteristics of automatic transmission shift control method for correcting of the present invention, lies also in：
The minimum speed n that the engine effectively worksminWhen being in each gearratio for transmission for vehicles, engine is not put out The maximum value of minimum speed corresponding to fire；The maximum (top) speed n that the engine effectively worksmaxIt is worked normally for vehicle motor Maximum speed.
The lower rotation speed limit n of the engine best effortdownWhen being in each gearratio for transmission for vehicles, execution machine of shifting gears Structure can realize the minimum value of maximum engine speed corresponding to safety gearshift, and ndown≥nmin；The adjacent gear of speed changer is defined to pass The dynamic maximum value than ratio is qmax, the rotating speed upper limit n of the engine best effortup=ndown×qmax。
Compared with the prior art, the present invention has the beneficial effect that：
1st, the present invention is by the gear amendment of automatic transmission and the adjustment of rotational speed of engine, shortening vehicle and promptly making Braking distance when dynamic, improves braking safety during emergency brake of vehicle.
2nd, the present invention utilizes the braking moment characteristic of engine, special by the pump gas resistance and mechanical friction that play engine Property, braking ability during emergency braking is improved, reduces the abrasion of braking system and the heat fading phenomenon of braking system, is extended The service life of braking system.
3rd, it is urgent to realize raising vehicle by the gear amendment of automatic transmission and the adjustment of rotational speed of engine by the present invention Braking ability, without changing vehicle hardware system, without the braking systems hardware cost such as brake disc and shoe brake is increased, only It needs to increase the corresponding software program of this control method in automatic transmission electronic control unit, operability is strong, and can fit It is applied widely for equipping the vehicle of different type automatic transmission.
4th, it is urgent to realize raising vehicle by the gear amendment of automatic transmission and the adjustment of rotational speed of engine by the present invention Braking ability when designing brake systems design, considers the severity of braking that engine braking torque characteristic can improve, is ensuring always It is appropriate to reduce braking system performance parameter under the premise of body braking ability meets national standard, so as to reduce braking system Hardware cost, engineer application are stronger.
Description of the drawings
The automatic transmission shift that Fig. 1 is the present invention corrects schematic diagram；
Fig. 2 is the engine steady state torque characteristic curve figure of the embodiment of the present invention；
Fig. 3 is the speed changer basic motive type gearshift curve graph of the embodiment of the present invention；
Fig. 4 is the engine braking torque performance diagram of the embodiment of the present invention.
Specific embodiment
In the present embodiment, it is a kind of improve emergency brake of vehicle performance automatic transmission shift control method for correcting, be When equipping the vehicle progress emergency braking of automatic transmission, pass through the gear amendment of automatic transmission and the rotating speed tune of engine It is whole, using the braking moment characteristic of engine, braking distance when shortening emergency brake of vehicle, the abrasion for reducing braking system, And improve emergency braking performance.Refering to Fig. 1, V is speed, and n is engine speed, is to carry out as follows specifically：
Step 1 determines the minimum speed n that engine effectively works during emergency brake of vehicleminWith maximum (top) speed nmax；Its In, minimum speed n that engine effectively worksminWhen being in each gearratio for transmission for vehicles, engine is not flame-out corresponding most The maximum value of small rotating speed；
When transmission gear d={ m, m-1 ..., 2,1 }, it is ensured that normal vehicle operation, engine are not flame-out corresponding Minimum speedIt can be according to the universal characteristic curve of engine, transmission parameters and vehicle ginseng Number is calculated, i.e. during transmission gear d={ m, m-1 ..., 2,1 }, overcomes vehicle running resistance, maintain vehicle normal operation Engine is needed to provide the minimum value of driving force, minimum during referred to as gear d={ m, m-1 ..., 2,1 } maintains driving force, The minimum rotating speed maintained corresponding to driving force when then engine provides gear d={ m, m-1 ..., 2,1 } is transmission gear Minimum speed during d={ m, the m-1 ..., 2,1 } of position.The minimum speed n that engine effectively worksminIt is in for transmission for vehicles During gear d={ m, m-1 ..., 2,1 }, the not flame-out corresponding minimum speed of engineMaximum Value, i.e.,：
The braking moment T of enginebe=T0+ kn, wherein, T0It is the constant unrelated with engine speed n, k is by starting The constant that the characterisitic parameter of machine determines, by the braking moment formula of engine it is found that the braking moment of engine turns with engine It is the pseudo- linear relationship of direct ratio between speed, i.e.,：Engine speed is higher, and braking moment is bigger, and the braking effect of generation is bigger, then The maximum (top) speed n that engine effectively worksmaxMaximum speed for vehicle motor normal work.
Step 2, the lower rotation speed limit n for determining engine best effort during emergency brake of vehicledownWith rotating speed upper limit nup；Its In, the lower rotation speed limit n of engine best effortdownWhen being in each gearratio for transmission for vehicles, gear shifting actuating mechanism can be realized The minimum value of maximum engine speed corresponding to safety gearshift, and ndown≥nmin；
The gear shifting actuating mechanism of vehicle automatic speed variator is generally shift clutch, passes through hydraulic system or motor module Shift process is completed in the separation and engagement of the corresponding shift clutch of drive control, realizes gear switching.
The driving disc spacing pressing of shift clutch is connect with engine output shaft, the driven disc and transmission output shaft of shift clutch Connection, the output shaft of speed changer are connected to driving wheel of vehicle by main reducing gear, the driving disc spacing pressing of shift clutch and driven disc Speed discrepancy is smaller, and the load torque that shift clutch is born is smaller, and shift clutch engagement more smoothes out；In emergency braking operating mode Under, engine is a passive energy consumption machine by towing astern, and driven disc of the inertia through clutch of vehicle drives driving disc spacing pressing, when Engine is in the minimum speed state effectively to work, since speed is higher, driving wheel anti-pass to engine, so that engine turns Speed is higher than the minimum speed n effectively to workminAnd braking moment is generated, and according to the braking moment characteristic of engine, engine at this time Rotating speed it is higher, the braking moment of generation is bigger.
It when the engine speed is lower, can be by reducing gear to improve engine speed, when implementing downshift, currently Then the clutch separation of gear, then clutch driven plate rotating speed rising change to the clutch slipping engagement of gear, drive clutch Device active disk rotating speed rises, and engine working speed is made to increase；It is noted that in downshift previous moment, clutch principal and subordinate Moving plate is in engagement state, and driven disk rotating speed is equal with engine speed, when the clutch is disengaged, under engine speed meeting is rapid Drop, clutch driven plate due to losing load so that rotating speed can rise suddenly, and there are rotating speeds with engine speed for driven disk rotating speed Difference, speed discrepancy is bigger, and the load torque that shift clutch is born is bigger, and pause and transition in rhythm or melody, clutch abrasion are got in shift clutch engagement It is more serious, in some instances it may even be possible to occur due to the driven disc of shift clutch and too big and generation the load torque of the speed discrepancy of driving disc spacing pressing More than the torque limit that the clutch changed can bear, cause shift clutch that can not engage, therefore, engine during emergency braking The lower rotation speed limit n of best effortdownIt is determining need consider gearshift of vehicle transmission clutch engagement safety and using the longevity Life.
When transmission gear d={ m, m-1 ..., 2,1 }, it is ensured that the shift clutch of transmission for vehicles can shift gears safely The maximum (top) speed of corresponding engineIt can be joined according to the design of gearshift of vehicle transmission clutch Number is calculated, i.e. during transmission gear d={ m, m-1 ..., 2,1 }, is ensuring the safety of shift of transmission executing agency Under the premise of adequate service life, when carrying out shift of transmission clutch safe engagement with detaching, shift clutch is master and slave Moving plate can bear the maximum value of loading moment, and maximum during referred to as gear d={ m, m-1 ..., 2,1 } bears load force Square, then it is right that the maximum when braking moment that engine provides is equal to gear d={ m, m-1 ..., 2,1 } bears loading moment institute The maximum (top) speed when rotating speed answered is transmission gear d={ m, m-1 ..., 2,1 }.The lower rotation speed limit of engine best effort ndownWhen being in gear d={ m, m-1 ..., 2,1 } for transmission for vehicles, it is ensured that the shift clutch of transmission for vehicles is in each gear Maximum engine speed corresponding to safety gearshift can be achieved in positionMinimum value, i.e.,：In order to ensure that vehicle runs well, it is necessary to assure ndown≥nmin。
The ratio of adjacent low gear and high gear gearratio is q when defining transmission gear d={ m, m-1 ..., 2,1 }, i.e.,：q ={ qm-1,qm-2,...,q2,q1, then as transmission gear d=m-2, gear d=m-2 is q=with d=m-3 gearratios ratio qm-3, the lower rotation speed limit of engine best effort is ndown, according to transmission power gearshift curve computational methods, work as engine Rotating speed is increased to n=ndown×qm-3When reached the shifting points of speed changer, the gear d of speed changer needs to become m-3 from m-2； After transmission gear d becomes m-3 from m-2, since transmission ratio expands qm-3Times, then it maintains needed for current vehicle speed Engine speed rises, in order to maximally utilise the braking moment characteristic of engine, then when transmission gear d=m-2, gear Position d=m-2 is q=q with d=m-3 gearratios ratiom-3, the lower rotation speed limit of engine best effort is ndownWhen, engine is most The rotating speed upper limit of good work
The maximum value for defining the adjacent gear transmission ratio ratio of speed changer is qmax, consider that engine braking torque characteristic utilizes Maximization principle, the rotating speed upper limit n of engine best effortup=ndown×qmax。
When step 3, emergency brake of vehicle, when engine speed n is less than the lower rotation speed limit n of engine best effortdownWhen, The optimum speed range of engine braking torque is deviated from, it is best to engine braking torque to need to adjust the rotating speed of engine Rotating speed section；Consider that engine cannot stop working, engine speed n has to be larger than or equal to nmin；Consider that adjustment engine speed needs It to be realized by reducing the gear of speed changer, then when transmission gear d is more than 1 and is less than or equal to highest gear number m, speed change One gear of device gear drop, and engine speed is made to be promoted to n after the completion of downshiftup, to ensure engine speed always in braking The best rotating speed interval range of torque, maximally utilises the braking characteristic of engine, improves the urgent of motor vehicle braking system Braking ability shortens braking distance；The abrasion of braking system is reduced simultaneously, extends the service life of braking system.
Step 4, when engine speed n be less than nminWhen, engine is unable to maintain that normal operation until stopping working, due to the modern times The brake pressure of the braking system of most vehicles relies on vacuum booster generation, if do not driven by vacuum booster Sail operating personnel be difficult by pedal brake pedal generate brake pressure, and vacuum booster work be when engine operates, Under the premise of vacuum booster vacuum is extracted in inlet manifold air inlet, therefore, in order to ensure that braking system works normally, during emergency braking Engine cannot stop working, and when transmission gear d is equal to 1, need, by the way that transmission gear is become neutral gear, to disconnect engine Driven loads, to ensure that engine does not stop working, therefore, when engine speed n is less than nminAnd transmission gear d be equal to 1 when, become Fast device gear becomes neutral gear.
Embodiment：The present embodiment carries out certain car model using the control method of the present invention fluid drive of emergency braking Device gearshift Correction and Control, the whole-car parameters of the car model are as follows：
Kerb weight：1600kg；Transmission types：5 speed dual-clutch transmissions；Air resistance coefficient：0.4；Rolling resistance system Number：0.018；Front face area：2m2；Transmission efficiency：0.9；Master subtracts：3.842；Radius of wheel：0.317m；The corresponding biographies of gear 1-5 Dynamic ratio：3.615、2.053、1.370、1.031、0.837；The corresponding correction coefficient of rotating mass of gear 1-5：1.34、1.14、 1.08、1.05、1.04。
The steady state torque characteristic curve that engine test data obtain is as shown in Fig. 2, wherein engine speed are to start Machine rotating speed, throttle are throttle opening, and engine torque are motor torque, according to whole-car parameters and engine Characteristic curve data to calculate speed changer basic motive type gearshift curve as shown in Figure 3；The braking moment characteristic curve of engine As shown in figure 4, the braking moment of engine and rotating speed are substantially linear, according to the braking moment characteristic of engine, in vehicle Engine speed is higher during emergency braking, and the braking moment provided is bigger.
It is assumed that the car model in normal road, encounters emergency, need to carry out emergency braking, current vehicle speed is 100km/h, transmission gear 5, throttle opening 15, engine speed 2500r/min are tight to the car model below Carry out shift of transmission Correction and Control during anxious braking is specific to control process as follows to improve emergency braking performance：
(1) the minimum speed n that engine effectively works during the car model emergency braking is determinedminWith maximum (top) speed nmax；
The steady state torque characteristic curve of shown engine and speed changer basic motive type shown in Fig. 3 gearshift according to fig. 2 Curve is it is found that the range of speeds of the engine work is 800r/min~6000r/min, thus may determine that the model vapour The minimum speed n that engine effectively works during vehicle emergency brakingmax=800r/min and maximum (top) speed nmax=6000r/min；
(2) the lower rotation speed limit n of engine best effort during the car model emergency braking is determineddownWith rotating speed upper limit nup；
By simulation calculation, when transmission gear d={ 5,4,3,2,1 }, it is ensured that the gearshift of the car model speed changer Clutch can shift gears safely corresponding engine maximum (top) speed n=3100r/min, 3200r/min, 3240r/min, 3510r/min, 3800r/min }, then the lower rotation speed limit n of engine best effortdownFor transmission for vehicles be in gear d=5, When 4,3,2,1 }, it is ensured that the shift clutch of the car model speed changer can be achieved to start corresponding to safety gearshift in each gear The minimum value of machine maximum (top) speed n={ 3100r/min, 3200r/min, 3240r/min, 3510r/min, 3800r/min }, i.e.,： ndown=min { 3100r/min, 3200r/min, 3240r/min, 3510r/min, 3800r/min }=3100r/min, and ndown ＞ nmin, ensure that automobile runs well.
The gearratio ratio of adjacent gear is during car model transmission gear d={ 5,4,3,2,1 }The maximum of the adjacent gear transmission ratio ratio of speed changer It is worth for qmax=1.499, then the rotating speed upper limit n of engine best effortup=ndown×qmax=3100r/min × 1.499= 4647r/min。
(3) when the car model carries out emergency braking, present engine rotating speed n=2500r/min is best less than engine The lower rotation speed limit n of workdown=3100r/min, and more than the minimum speed n effectively to workmin=800r/min, engine turn Speed needs to adjust the rotating speed of engine to the best rotating speed area of engine braking torque not in the best range of speeds of braking moment Between, the current shift d=5 of speed changer is down to d=4, and engine speed is made to be promoted to n after the completion of downshiftup=4647r/ Min makes engine speed be in the best rotating speed interval range of braking moment, and the braking for maximally utilising engine is special Property improves the emergency braking performance of motor vehicle braking system.
(4) the gear Correction and Control of speed changer and the adjustment of rotational speed of engine are carried out according to (3), meets gearshift correction conditions Shi Jinhang gearshifts are corrected, and adjust engine speed to the best rotating speed interval range of engine braking torque, when engine turns Fast n is less than nmin=800r/min, and during transmission gear d=1, engine will be unable to maintain to run well until stopping working, to protect Braking system normal work is demonstrate,proved, engine cannot stop working during emergency braking, need, by the way that transmission gear is become neutral gear, to disconnect The driven loads of engine, to ensure that engine does not stop working, above-mentioned shift of transmission makeover process to car model braking stops Until only.So far, shift of transmission Correction and Control process when completing certain car model emergency braking.
By simulation calculation it is found that the car model current vehicle speed be 100km/h, transmission gear 5, air throttle is opened It is 15 to spend, engine speed for 2500r/min carry out emergency braking, shift of transmission control method for correcting using the present invention, Continuous ten braking average distances of the car model are 39.2m, and brake disc mean temperature is 240 degrees Celsius, does not use the present invention Shift of transmission control method for correcting, rely solely on braking system and braked, continuous ten times braking average distance be 41.1m, brake disc mean temperature are 300 degrees Celsius, shorten emergency stopping distance and brake system disk temperature.
It therefore, can be to the maximum extent using shift of transmission control method for correcting of the present invention when vehicle carries out emergency braking Using the braking characteristic of engine, the emergency braking performance of motor vehicle braking system is improved, shortens braking distance；It reduces simultaneously continuous The brake disc temperature generated is braked, the abrasion of braking system is reduced, extends the service life of braking system.

Claims (3)

1. a kind of automatic transmission shift control method for correcting for improving emergency brake of vehicle performance, it is characterized in that as follows It carries out：
Step 1 determines the minimum speed n that engine effectively works during emergency brake of vehicleminWith maximum (top) speed nmax；
Step 2, the lower rotation speed limit n for determining engine best effort during emergency brake of vehicledownWith rotating speed upper limit nup；
Step 3, when engine speed n be less than ndownAnd more than or equal to nmin, transmission gear d is more than 1 and less than or equal to most During high gear digit m, transmission gear potential drop one is kept off, and engine speed is made to be promoted to n after the completion of downshiftup,
Step 4, when the engine speed n be less than nmin, and when the transmission gear d is equal to 1, transmission gear becomes empty Gear.
2. automatic transmission shift control method for correcting according to claim 1, it is characterised in that：The effective work of engine The minimum speed n of workminWhen being in each gearratio for transmission for vehicles, the maximum value of the not flame-out corresponding minimum speed of engine； The maximum (top) speed n that the engine effectively worksmaxMaximum speed for vehicle motor normal work.
3. automatic transmission shift control method for correcting according to claim 1, it is characterised in that：The best work of engine The lower rotation speed limit n of workdownWhen being in each gearratio for transmission for vehicles, gear shifting actuating mechanism can realize that safety gearshift is corresponding and send out The minimum value of motivation maximum (top) speed, and ndown≥nmin；The maximum value for defining the adjacent gear gearratio ratio of speed changer is qmax, it is described The rotating speed upper limit n of engine best effortup=ndown×qmax。
CN201610913414.2A 2016-10-19 2016-10-19 A kind of automatic transmission shift control method for correcting for improving emergency brake of vehicle performance Active CN106364478B (en)

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