JP5325270B2 - Electronic control unit - Google Patents

Description

  The present invention relates to an electronic control unit for controlling, for example, an antilock brake system (ABS) of a vehicle.

  As an electronic control device used in, for example, an antilock brake system of a vehicle, for example, there is one described in Patent Document 1 below.

  This conventional electronic control device includes a hydraulic control block made of an aluminum alloy material electrically connected to the vehicle body, a resin case provided at the upper end of the hydraulic control block, and an upper portion of the case. And a circuit board accommodated in the cover.

  An electrical connection member is attached to the case, and one end side of the electrical connection member is connected to the ground portion of the circuit board within the cover, and the other end side is in pressure contact with the upper surface of the hydraulic control block. As a result, the fluid pressure control block and the grounding portion of the circuit board are electrically connected to each other, so that electrical noise of electronic components on the circuit board is reduced.

JP 2007-290596 A

  However, in the conventional electronic control device, when the cover is made of metal, the circuit board and the cover are disposed close to each other, so that electric noise generated in the circuit board passes through the cover. May be emitted to the outside.

  Further, the hydraulic control block is provided with a drive actuator such as an electric motor or a pressure increasing / decreasing valve, and these electric noises may be transmitted to the cover through the case and radiated to the outside.

  The present invention has been devised in view of the technical problem of the conventional electronic control device, and provides an electronic control device capable of effectively reducing electrical noise transmitted from a circuit board or the like to a cover member. It is an object.

  The present invention relates to a metal hydraulic control block provided with hydraulic control devices, a metal cover member fitted to the hydraulic control block, and held between the hydraulic control block and the cover member. An electronic control mechanism for driving the hydraulic control devices, and the electronic control mechanism includes a synthetic resin bus bar structure having a power electronic circuit for driving the hydraulic control devices, A circuit board that controls the driving of the hydraulic control devices via the bus bar structure, and the circuit board on which a plurality of electronic components are mounted is fixed to the bus bar structure in a superposed state by a fixing means; Conductive means for electrically connecting the cover member and the hydraulic pressure control block via the fixing means is provided.

  According to the present invention, since the electrical noise transmitted from the circuit board to the cover member can be released to the hydraulic pressure control block by the conduction means, the electrical noise at the cover member can be effectively reduced.

It is a disassembled perspective view which shows one Embodiment of the electronic controller which concerns on this invention. It is a cross-sectional view of the electronic control apparatus of this embodiment. FIG. 3 is an enlarged view of a main part of FIG. 2.

  Hereinafter, an embodiment in which an electronic control device according to the present invention is applied to an ABS will be described in detail with reference to the drawings.

  First, the outline of the ABS will be described. A master cylinder that generates a brake pressure corresponding to a depression amount of a brake pedal (not shown), the master cylinder, front wheel left and right (FR, FL) side, and rear wheel left and right (RL, RR) ) Side communication with each wheel cylinder, and a normally open solenoid type booster valve and a normally closed solenoid type, which are provided in the main path and control brake fluid pressure from the master cylinder to each wheel cylinder. A pressure reducing valve, a pump that is provided in the main passage and discharges brake fluid pressure to each wheel cylinder, and brake fluid discharged from each wheel cylinder is stored via the pressure reducing valve, and a pump And a reservoir tank for supplying brake fluid to the main passage.

  The pressure increase valve controls the brake fluid pressure from the master cylinder so that it can be supplied to each wheel cylinder during normal brake operation, while the pressure reducing valve causes the wheel to slip when the internal pressure of each wheel cylinder exceeds a predetermined level. When opened, the brake fluid is returned to the reservoir tank.

  The pressure increase / decrease is controlled to be opened / closed by an electronic control unit, so that the brake fluid pressure in each wheel cylinder is increased / decreased / held.

  As shown in FIGS. 1 and 2, the electronic control device includes a casing 1 and a plurality of electronic control mechanisms 2 held in the casing 1.

  The casing 1 includes a lower hydraulic pressure control block 3 electrically connected to the vehicle body, a cover member 4 for fitting the electronic control mechanism 2 assembled on the upper portion of the hydraulic pressure control block 3 from above, It has.

  The hydraulic pressure control block 3 is integrally formed in a substantially cubic shape by an aluminum alloy material, and a plurality of holding holes 7 for inserting and holding the lower portions of the plurality of pressure increasing valves 5 and pressure reducing valves 6 are provided in the vertical direction on the upper surface side. And a metal solenoid case 8 that is coupled to the upper ends of the pressure increasing valves 5 and the pressure reducing valves 6 and in which an electromagnetic coil is accommodated is held. The bottom surface of the solenoid case 8 is in electrical contact with the top surface 3a of the hydraulic pressure control block 3.

  Further, inside the hydraulic pressure control block 3, brake hydraulic pressure is supplied to the main passage and the sub passage communicating with the pressure increasing valve 5 and the pressure reducing valve 6 which constitute a part of the hydraulic pressure control devices, and further to the main passage. A hydraulic unit such as an electric motor for driving the pump and the pump is provided. Furthermore, female screw holes 9 into which fixing bolts 14 are screwed are formed at the upper four corners of the hydraulic pressure control block 3.

  The cover member 4 is formed of an aluminum alloy material in a thin dish shape along the outer shape of the hydraulic control block 3, and is formed integrally with a flat upper wall 4a and an outer peripheral edge of the upper wall 4a. Side wall 4b, and a rectangular frame-shaped flange portion 4c provided continuously and integrally with the lower end outer peripheral portion of the side wall 4b.

  A plurality of locking pieces 10 that are locked to the outer periphery of the upper end portion of the bus bar constituting body 11 in a state in which the cover member 4 is fitted with a printed board 12 to be described later are projected downward from the flange portion 4c. Each locking piece 10 is provided at a substantially central position in the longitudinal direction of each side of the flange 4c, and a locking claw 10a is formed on the outer side of the tip.

  As described above, the electronic control mechanism 2 disposed between the hydraulic pressure control block 3 and the cover member 4 outputs switching signals for opening and closing operations to the respective pressure increasing and pressure reducing valves 5 and 6. A bus bar structure 11 integrally formed with a power electronic circuit for supplying electric power to the stator of the electric motor, an electromagnetic filter circuit for reducing radio noise (electromagnetic noise), and a superposition state on the upper portion of the bus bar structure 11 And a printed circuit board 12 which is a circuit board for controlling the driving of the electric motor or the like.

  The bus bar structure 11 is formed in a block plate shape by molding with a synthetic resin material, and the outer shape is formed in a substantially rectangular shape along the outer shape of the hydraulic control block 3 and the cover member 4 as shown in FIG. Has been. Further, on the outer peripheral portion of the upper end of the bus bar structure 11, four engaging portions are engaged with the engaging claws 10a of the engaging pieces 10 of the cover member 4 and are elastically engaged with the inner through holes. 13 is provided integrally. Furthermore, bolt insertion holes 11a through which the fixing bolts 14 are inserted are formed at the corners of the outer peripheral portion of the bus bar structure 11 so as to penetrate in the vertical direction.

  Further, as shown in FIG. 2, an annular seal 15 that is elastically contacted and sealed to the outer peripheral side of the upper surface of the hydraulic pressure control block 3 is fixed to the outer peripheral portion of the lower end of the bus bar constituting body 11 through a fitting groove. Yes.

  A power connector connected to a battery, a motor connector supplying power to the electric motor, a signal connector serving as a transmission path for various signals such as resolver, CAN communication, and I / O are provided at the front end of the bus bar structure 11. The connector structure 16 consisting of is integrally provided.

  Further, on the surface and inside of the bus bar structure 11, there are many power distribution patterns such as a power source negative side bus bar and a power source positive side bus bar connected to the power connector, a bus bar for output to the motor, and a power source positive side bus bar. The power distribution pattern is formed.

  The bus bar structure includes a plurality of terminal groups 17 connected to the power connector, the motor connector, and the signal connector, a control signal terminal group 18 for driving a motor relay and a semiconductor switch element (FET) described later, and the like. 11 protrudes from the upper surface 11b of the electrode 11.

  Also, on the lower surface 11c of the bus bar structure 11, electronic components of the power electronic circuit, a plurality of aluminum electrolytic capacitors, normal coils, common coils, and a plurality of ceramic capacitors, which are components of the filter electronic circuit, are mounted. Yes.

  Further, as shown in FIGS. 2 and 3, one cylindrical portion 20 for fixing and supporting the printed circuit board 12 with a screw member 19 as a fixing means is integrally formed at a predetermined position on the upper surface 11b of the bus bar constituting body 11. Is erected.

  The screw member 19 is integrally provided via a head portion 19a on one end side where a cross groove for a driver jig is formed on the upper surface, and a flange portion 19c provided on the lower surface of the head portion 19a. It is comprised from the shaft part 19b of the other end side by which was cut | disconnected.

  The cylindrical portion 20 forms a gap S having a predetermined width between the bus bar structure 11 and the printed circuit board 12, and the length in the axial direction is the upper surface of the bus bar structure 11 or the printed circuit board 12. The length is set so as not to interfere with an electronic component to be described later mounted on the lower surface.

  Further, a through-hole 21 that continuously penetrates the bus bar structure 11 is formed in the tubular portion 20 along the vertical direction, and the through-hole 21 on the tubular portion 20 side is also formed. A metal sleeve 22 is integrally fixed to the inner peripheral surface by press fitting or the like. The sleeve 22 is formed with an internal thread on the inner peripheral surface to which the male thread on the outer periphery of the shaft portion 19b of the screw member 19 is screwed.

  As shown in FIGS. 2 and 3, the printed circuit board 12 is formed of a synthetic resin material into a substantially square thin plate shape, and is screwed into a position corresponding to the cylindrical portion 20 of the bus bar structure 11 near the center. A hole 23 is formed through. A substantially annular conductive piece 24 is integrally provided on the insertion side of the screw member 19 of the screw insertion hole 23, that is, on the hole edge on the printed circuit board upper surface 12 a side. The conductive piece 24 is formed with an insertion hole 24a through which the shaft portion 19b of the screw member 19 is inserted, and the flange portion 19c of the screw member 19 is seated on the exposed upper surface. .

  The printed circuit board 12 is mounted with a plurality of electronic components including a microcomputer, for example, a semiconductor switch element (MOS-FET), an acceleration sensor 30 and the like, and a distribution pattern which is a part of a control circuit is formed inside. Has been. A driving signal for the electric motor is generated by the printed circuit board 12. The acceleration sensor 30 is mounted in the vicinity where the printed circuit board 12 is fixed by the screw member 19.

  Further, the pins 17a and 18a of the terminal groups 17 and 18 of the bus bar constituting body 11 are inserted into a plurality of terminal holes 12c formed on one side and the other side of the printed board 12, respectively, and soldered. Connected by.

  The acceleration sensor 30 is a tuning fork type sensor having a detuning frequency of 500 to 900 Hz. When the printed circuit board 12 resonates at the detuning frequency, the acceleration sensor 30 resonates and the sensor output drifts (offset). Resulting in.

  In the vicinity of the fixing portion of the screw member 19 of the printed circuit board 12, the vibration frequency of the printed circuit board 12 can be increased to 1000 to 1300 Hz, and does not overlap with the detuning frequency of the acceleration sensor 30, and the sensor output drifts. It is advantageous.

  And between the said hydraulic-pressure control block 3 and the cover member 4, as shown in FIGS. 1-3, the conduction | electrical_connection means which electrically conducts both 3 and 4 via the said screw member 19 is provided. ing.

  The conduction means is provided on the head 19a side of the screw member 19 and is elastically contacted with the lower surface 4d of the upper wall of the cover member 4. The shaft portion 19b of the screw member 19 and the solenoid case 8 And an earth spring 26 mounted between the two.

  The earth plate 25 is formed by bending a conductive thin thin plate into a substantially concave shape, and has a flat base portion 25a and rising pieces 25b and 25b rising from both side edges of the base portion 25a toward the cover member 4. And. The base portion 25a has a through hole 25c through which the shaft portion 19b of the screw member 19 is inserted in the center, and is sandwiched and fixed between the flange portion 19c of the screw member 19 and the conductive piece 24. It has become. The both rising pieces 25b, 25b are bent at the upper ends 25d, 25d outwardly and are in elastic contact with the lower surface 4d of the cover member 4.

  The earth spring 26 is formed in the shape of a coil spring by a metal material, the upper end portion is accommodated and held in the through hole 21, the upper end edge 26 a is in elastic contact with the lower end edge of the shaft portion 19 b of the screw member 19, and penetrates A lower end edge 26b of the lower end portion protruding downward from the hole 21 is in elastic contact with the upper surface of the solenoid case 8 (black point T in FIG. 1).

[Assembly procedure]
Hereinafter, the assembly procedure of the electronic control device will be described. First, the hydraulic pressure control block 3 is preliminarily assembled with each of the pressure increasing and pressure reducing valves 5 and 6, a pump, an electric motor, a reservoir, and the like to constitute a hydraulic unit. Further, the power distribution pattern of the power electronic circuit and the filter electronic circuit is modularized to integrally form the bus bar structure 11, and a plurality of electronic components such as the electrolytic capacitors are mounted on the bus bar structure 11. . Furthermore, various electronic components such as a power distribution pattern of the printed circuit board 12 and the semiconductor switch elements are mounted.

  In addition, the ground plate 25 is temporarily attached to the shaft portion 19b of the screw member 19 in advance through the insertion hole 25c.

  Subsequently, the printed circuit board 12 is placed on the upper surface of the cylindrical portion 20 of the bus bar constituting body 11 with the lower surface hole edge of the screw insertion hole 22 in contact with each other. The corresponding front terminal pins 17a and 18a are inserted while being positioned.

  Next, the tip end of the shaft portion 19b of the screw member 19 is inserted into the sleeve 22 from the bolt insertion hole 24a of the conductive piece 24 with the ground plate 25 temporarily attached, and the screw member 19 is directly passed through the male and female screws. Then, it is screwed with a predetermined torque while being screwed.

  Then, the ground plate 25 is fixed at the base portion 25a with the flange portion 19c of the screw member 19 and the conductive piece 24, and at the same time, the entire ground spring 26 is compressed and deformed, and the upper end edge 26a. Elastically contacts the lower end edge of the shaft portion 19b, and the lower end edge 26b elastically contacts the upper surface of the solenoid case 8.

  As a result, the printed circuit board 12 is fixed at a position above the bus bar structure 11, and electrical conductivity between the printed circuit board 12 and the solenoid case 8 is ensured.

  Thereafter, the terminal pins 17a and 18a are soldered to the printed circuit board 12 while being inserted into the terminal holes 12c. Thereby, they are electrically connected to each other.

  Next, after applying an adhesive to the outer periphery of the cover member 4, the cover member 4 is fitted from above the printed circuit board 12 and the bus bar constituting body 11, and each locking claw 10a of each locking piece 10 is connected to the bus bar. When engaging with the locking holes of the locking portions 13 of the structural body 11 using elastic deformation, the locking claws 10a are locked to the lower hole edges of the locking holes, so that the bus bar structural body 11 can be simplified. Can be assembled.

  Subsequently, the bus bar constituting body 11 is placed in a temporarily fixed state while being positioned on the upper surface of the hydraulic pressure control block 3 via the annular seal 15, and then fixed to the hydraulic pressure control block 3 by the fixing bolts 14. To do. Thereafter, the ground spring 26 is inserted in advance into the through hole 21 of the bus bar structure 11, and the lower end edge 26 b is brought into contact with the upper surface of the solenoid case 8. Thereby, the assembly work of each component is completed.

  At this time, the upper surface of both upper end portions 25d and 25d of the earth plate 25 elastically contact the lower surface 4d of the upper wall 4a of the cover member 4 by its own elastic force. The base portion 25a of the ground plate 25 is sandwiched between the head portion 19a of the screw member 19 and the printed circuit board 12 and is electrically connected. The base portion 19 a of the screw member 19 is in elastic contact with the earth spring 26 and is electrically connected to the shoulder portion of the solenoid case 80. Further, since the solenoid case 8 is also in electrical contact with the hydraulic pressure control block 3, this ensures electrical conductivity between the cover member 4 and the hydraulic pressure control block 3.

  As described above, in the present embodiment, the hydraulic control block 3 and the cover member 4 are electrically connected by the screw member 19, the ground plate 25, and the ground spring 26, so that both the potentials 3 and 4 can be set to the same potential. it can. For this reason, the electrical noise transmitted from the printed circuit board 12 to the cover member 4, more specifically, the electrical noise generated in the current line of the motor or solenoid as noise due to a magnetic field change caused by a change (switching) of the drive current of the motor or solenoid. Can flow to the hydraulic pressure control block 3 side, that is, the vehicle body side. Thereby, the electric noise in the said cover member 4 can be reduced effectively. Therefore, noise superimposition on the signal line provided on the printed circuit board 12 can be suppressed.

  In addition, since the electric noise generated on the printed circuit board 12 can be directly transmitted to the hydraulic control block 3 through the conductive piece 24, the electric noise generated on the printed circuit board 12 can be effectively reduced.

  In addition, since electrical noise transmitted from the outside to the cover member 4 can also flow through the hydraulic pressure control block 3, noise transmission to the printed circuit board 12 can be sufficiently suppressed.

  Further, since the acceleration sensor 30 mounted on the printed circuit board 12 is disposed in the vicinity of the fixed position by the screw member 19, vibration transmission to the acceleration sensor 30 can be effectively prevented, so that the acceleration A decrease in detection accuracy can be suppressed.

  In addition, since the electrical conductivity between the both 3 and 4 is ensured by using the existing screw member 19, the manufacturing cost can be reduced.

  That is, the ground plate 25 is fixed to the printed circuit board 12 by the screw torque of the screw member 19, and the ground spring 26 is elastically contacted with the solenoid case 8 by using the screwing force of the screw member 19. Compared with the case where a different earth connection member is formed and fixed to the bus bar structure, the structure is simplified, and the manufacturing work is facilitated.

  Further, since the lower end edge 26b of the earth spring 26 is not brought into direct contact with the hydraulic pressure control block 3, but is made into elastic contact with the existing solenoid case 8, the axial length of the earth spring 26 is sufficiently shortened. Can do. Thus, as described above, when the screw member 19 is screwed and a compressive force is applied to the ground spring 26, the linear spring is always maintained without being inadvertently tilted or twisted in the radial direction. Is possible. Therefore, a stable elastic contact with the solenoid case 8 is obtained.

  Furthermore, by simply screwing the screw member 19, it is possible to obtain the fixing of the ground plate 25 to the printed circuit board 12 and the elastic contact force of the ground spring 26 at the same time.

  Further, since the cover member 4 and the printed circuit board 12 and the solenoid case 8 are always elastically contacted via the screw member 19 by the spring force of the earth plate 25 and the earth spring 26, even if vibration is generated, the liquid The continuity between the pressure control block 3 and the cover member 4 can always be maintained stably.

  In particular, since the ground plate 25 is in elastic contact with the lower surface 4d of the upper wall of the cover member 4 and the ground spring 26 is in elastic contact with the solenoid case 8, the entire length of the conduction means including the screw member 19 is achieved. The degree of freedom increases.

  As a result, even if a vertical dimensional error or assembly error of the hydraulic pressure control block 3, the cover member 4, and the bus bar structure 11 occurs, the ground plate 25 and the ground spring 26 are bent and deformed in the longitudinal direction. Since each error can be absorbed, positioning and assembly work are facilitated.

  Further, since the earth plate 25 and the earth spring 26 are arranged in the dead space above and below the screw member 19, the dead space can be effectively used. As a result, an increase in the size of the device and a change in circuit arrangement can be suppressed.

  Furthermore, in this embodiment, since the power electronic circuit and the distribution pattern of the filter electronic circuit are integrated into a module and configured as a thin bus bar structure 11, the vertical height of the electronic control device is sufficiently reduced. As a result, the entire apparatus can be reduced in size (thinned) and reduced in weight.

  Moreover, in this embodiment, since the said cover member 4 can be combined with the bus-bar structure 11 by one touch only using each latching piece 10 and each latching | locking part 13, assembly | attachment of this cover member 4 Work becomes good.

  The present invention is not limited to the configuration of the above-described embodiment. For example, the ground plate 25 and the ground 26 are not electrically connected via the screw member 19. For example, the cylindrical shape is formed on the outer periphery of the shaft portion 19 b of the screw member 19. It is also possible to make the two conductive materials 25 and 26 conductive through this conductive material.

  Further, as the fixing means, it is possible to use a bolt and a nut, or a conductive rivet.

  Furthermore, the earth plate 25 may be only the rising piece 25b on one side. Further, for example, the shape and structure of the casing 1 and the bus bar structure 11 can be arbitrarily changed.

  Furthermore, the application target device of the electronic control device can be applied to a traction control device in addition to ABS.

The technical ideas of the invention other than the claims ascertained from the embodiment will be described below.
[Claim a] The fixing means is constituted by a screw member, and a screw insertion hole through which the screw member is inserted is formed at a predetermined position of the circuit board, and a hole on the screw insertion side of the screw insertion hole is formed. The electronic control device according to claim 2, wherein a conductive piece is provided on an edge, and the ground plate is sandwiched and fixed between the conductive piece and a head portion of the screw member.
[B] The ground plate is formed in a concave shape by a flat base piece fixed by the fixing means and rising pieces rising from both ends of the base piece toward the cover member. The electronic control device according to claim 2, wherein each upper end is bent outward and the upper surface of each upper end is in elastic contact with the lower surface of the cover member.
[C] A cylindrical portion is integrally formed on the upper surface of the bus bar structure, and a metal sleeve having a female screw to which the screw member is screwed is integrally fixed to the inner periphery of the cylindrical portion. The electronic control device according to claim a or b.
[D] The one end portion of the earth spring is elastically contacted with the tip end edge of the shaft portion of the screw member, and the other end portion is elastically contacted with the upper surface of the solenoid case. The electronic control device according to any one of the above.

DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Electronic control mechanism 3 ... Hydraulic pressure control block 3a ... Upper surface 4 ... Cover member 4d ... Lower surface 5 * 6 ... Pressure increase and pressure reducing valve (hydraulic pressure control equipment)
8 ... Solenoid case 11 ... Bus bar structure 12 ... Printed circuit board (circuit board)
19 ... Screw member (fixing means)
DESCRIPTION OF SYMBOLS 19a ... Head part 19b ... Shaft part 19c ... Flange part 20 ... Cylindrical part 21 ... Through-hole 23 ... Screw insertion hole 24 ... Conductive piece 25 ... Ground plate (conduction means)
25a ... Base 25b ... Rising piece 25c ... Insertion hole 25d ... Upper end 26 ... Earth spring (conduction means)
26a ... Upper edge 26b ... Lower edge

Claims (3)

A metal control block provided with control devices, a metal cover member fitted to the control block, and electronic control that is held between the control block and the cover member and drives the control devices A mechanism,
The electronic control mechanism is composed of a synthetic resin material bus bar structure having a power electronic circuit that drives the control devices, and a circuit board that controls the drive of the control devices via the bus bar structure,
The circuit board on which a plurality of electronic components are mounted is fixed to the bus bar structure in a superposed state by a metal fixing means,
An electronic control device comprising a conduction means for electrically conducting the cover member and the control block via the fixing means.   The conducting means includes a ground plate made of a conductive material having a base portion fixed to one end side of the fixing means and a tip portion elastically contacting the lower surface of the cover member; one end portion elastically contacting the other end side of the fixing means; 2. The electronic control device according to claim 1, wherein the electronic control device comprises an earth spring made of a conductive material whose end is elastically contacted with the control block via the control devices.   The control device includes a valve mechanism for increasing or decreasing a brake fluid pressure, and elastically contacts the other end of the earth spring to a metal solenoid case constituting each valve mechanism, so that the cover member The electronic control device according to claim 2, wherein the control block is electrically connected to the control block.

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