JP5325271B2 - 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, since the circuit board and the cover are arranged close to each other, the electric noise generated in the circuit board passes through the cover. There is a risk of radiation. 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, An electrical connection member that electrically connects the fluid pressure control block and the cover member via the bus bar structure body; and a circuit board that controls the drive of the fluid pressure control devices via the bus bar structure body. It is characterized by that.

  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, the electrical noise at the cover member can be effectively reduced.

1 is an exploded perspective view showing a first embodiment of an electronic control device according to the present invention. It is a principal part expanded sectional view of the electronic controller of this embodiment. It is a perspective view which shows the earth connection member and through-hole which are provided to this embodiment. It is an expanded sectional view which shows the state which the same earth connection member latched to the through-hole.

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 Embodiment]
First, the ABS will be described in outline. A master cylinder that generates a brake pressure corresponding to the amount of depression of a brake pedal (not shown), the master cylinder, front wheel left and right (FR, FL) side, and rear wheel left and right (RL, A main passage that communicates with each wheel cylinder on the RR) side, and a normally-open solenoid type booster valve and a normally-closed solenoid that are provided in the main passage and that control the brake fluid pressure from the master cylinder to each wheel cylinder. A pressure reducing valve of the mold, a plunger pump that is provided in the main passage and discharges the brake fluid pressure to each wheel cylinder, and the brake fluid discharged from each wheel cylinder is stored through the pressure reducing valve. And a reservoir tank that supplies brake fluid to the main passage by operation of the plunger pump.

  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 brake fluid pressure in each wheel cylinder is increased, reduced and maintained by opening / closing the increased / decreasing pressure by an electronic control unit.

  Each of the pressure increasing valve and the pressure reducing valve is opened and closed by being energized or de-energized based on a control signal from the electronic control unit.

  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 coil unit 8 coupled to the upper ends of the pressure increasing valves 5 and the pressure reducing valves 6 is held.

  Further, inside the hydraulic control block 3, the main passage and sub passage communicating with the pressure increasing valve 5 and the pressure reducing valve 6, the plunger pump for supplying brake hydraulic pressure to the main passage, and the electric motor for driving the pump. Etc. A hydraulic unit 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. It is also possible to use a reversible gear pump instead of the plunger pump.

  The cover member 4 is made of an aluminum alloy material functioning as a heat radiating material (heat sink) and is formed in a thin plate shape along the outer shape of the hydraulic control block 3, and includes a flat upper wall 4a and an outer wall of the upper wall 4a. It is composed of an annular side wall 4b integrally formed on the periphery, and a rectangular frame-shaped flange portion 4c provided continuously and integrally on the outer periphery of the lower end of the side wall 4b. Four locking pieces 10 that lock onto the outer periphery of the upper end portion of the bus bar constituting body 11 in a state where the cover member 4 is fitted with a printed circuit 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 the like is disposed on 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 a plurality of 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.

  On the other hand, as shown in FIG. 2, an annular seal 15 that is elastically contacted with the outer peripheral surface 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. .

  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, at a predetermined position on the upper surface 11 b of the bus bar structure 11, one cylindrical portion 20 that fixes and supports the printed circuit board 12 with screws 19 is integrally provided upright. A metal cylindrical portion 20a is integrally fixed to the inner peripheral surface of the cylindrical portion 20, and a female screw portion to which the screw 19 is screwed is formed on the inner peripheral surface of the cylindrical portion 20a. .

  Moreover, as shown in FIGS. 1-4, the through-hole 21 penetrated to the up-down direction is drilled in the outer vicinity of the said cylindrical part 20 of the bus-bar structure 11. As shown in FIG. The through-hole 21 is formed in a substantially T shape in plan view, and the insertion hole 21a is formed in a substantially rectangular shape, and the substantially rectangular relief located in the center of one side of the insertion hole 21a. It is comprised from the use hole 21b.

  The printed circuit board 12 is formed of a synthetic resin material into a substantially square thin plate shape, and a screw insertion hole 22 is formed in a predetermined position corresponding to the cylindrical portion 20 of the bus bar structure 11 near the center. Further, when the printed circuit board 12 is placed from above the bus bar structure 11, the lower surface side hole edge of the screw insertion hole 22 abuts on the upper surface of the tubular portion 20, and the tubular portion 20. The upper and lower gaps C are arranged so as to prevent the electronic components from interfering with each other.

  A plurality of electronic components including a microcomputer are mounted on the printed circuit board 12, and a power distribution pattern which is a part of a control circuit is formed therein. A drive control signal for the electric motor is generated by the printed circuit board 12.

  On the lower surface 12b of the printed circuit board 12, four semiconductor switch elements (MOS-FETs) which are heat generating elements (not shown) are arranged and fixed.

  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.

  An earth connection member 23 as an electrical connection member is fixed to the through hole 21 of the bus bar structure 11.

  As shown in FIG. 3, the ground connection member 23 is integrally formed in an elongated flat plate shape by a conductive material such as copper, and has a rectangular base portion 24 positioned in the through hole 21, and the base portion 24. It consists of elastic deformation portions 25 and 26 that are both ends extending in the vertical direction from the upper and lower edges, and a pair of left and right clip pieces 27 and 27 that are locking portions provided on both sides of the base portion 24. Further, as shown in FIG. 2, the ground connection member 23 has a total length when the cover member 4 is assembled to the hydraulic pressure control block 3 via the bus bar structure 11. 3 is set to be larger than the distance between the upper surface 3a of the cover 3 and the lower surface 4c of the upper wall 4a of the cover member 4.

  The base 24 is formed in a flat shape, and its vertical length L is slightly longer than the vertical length of the insertion hole 21 a of the through hole 21.

  The two elastically deformable portions 25 and 26 extend from the upper and lower ends of the base portion 24 in the vertical direction and are bent outwardly so as to be inclined, and the extended portions 25a and 26a The abutting portions 25b and 26b are formed integrally with the leading end edge, and the leading end portions are bent inwardly to each other. The outer surface of each of the abutting portions 25b and 26b is the hydraulic pressure control. The upper surface 3a of the block 3 and the upper wall 4a lower surface 4c of the cover member 4 are elastically contacted.

  The clip pieces 27 and 27 extend downward from the center of the base 24 integrally with shoulders 27a and 27a provided in the lateral direction and with a predetermined gap C and C from the shoulders 27a and 27a. It is comprised from the provided leg pieces 27b and 27b. Each of the shoulder portions 27a and 27a has an upper end edge formed in a downwardly inclined shape. The leg pieces 27b, 27b are formed with locking grooves 27c, 27c slightly larger than the wall thickness of the upper wall of the bus bar structure 11 on both outer sides, and at the lower ends of the locking grooves 27c, 27c. Locking claw portions 27d and 27d that are locked to the lower hole edge of the insertion hole portion 21a of the through hole 21 are formed.

[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 increase, pressure reducing valves 5 and 6, a plunger 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.

  On the other hand, the ground connection member 23 is locked and fixed in the through hole 21 of the bus bar structure 11. That is, as shown in FIG. 3, when the ground connecting member 23 is held so that the base 24 side becomes the insertion hole 21a side and is directly inserted into the through hole 21 from above, the lower elastic deformation portion 25 is It is inserted across both the insertion hole 21a and the escape hole 21b. When pushed down as it is, the locking claws 27d and 27d of the clip pieces 27 and 27 are elastically deformed inward through the gaps C and C while elastically contacting the opposing upper end edge and inner surface of the insertion hole 21a. When the locking grooves 27c and 27c are positioned in the insertion holes 21a, the clip pieces 27 and 27 are elastically restored, and the upper and lower edges of the locking grooves 27c and 27c are inserted into the insertion holes. Locks to the upper and lower opening edges of the portion 21a.

  As a result, the ground connection member 23 is firmly locked and fixed to the bus bar structure 11 with one touch.

  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.

  Thereafter, the screw 19 is screwed into the female screw portion of the cylindrical portion 20 a from the screw insertion hole 22 to fix the printed circuit board 12 to the upper position of the bus bar structure 11. 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, as shown in FIG. 2, after the adhesive 30 is applied to the outer periphery of the cover member 4, each locking claw of each locking piece 10 is fitted from above the printed circuit board 12 and the bus bar structure 11. When 10a is inserted into the locking holes of the locking portions 13 of the bus bar structure 11 using elastic deformation, the locking claws 10a are locked to the lower hole edges of the locking holes, whereby the bus bar structure 11 can be easily assembled.

  Next, the bus bar structure 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 fastened and fixed to the hydraulic pressure control block 3 by the fixing bolts 14. To do. At this time, the outer surface of the lower end of the bending portion 25 b of the elastic deformation portion 25 on the lower side of the ground connection member 23 is in elastic contact with the upper surface 3 a of the hydraulic pressure control block 3. Thereby, the assembly work of each component is completed.

  At this time, the upper surface of the curved portion 26 b of the elastic deformation portion 26 on the upper side of the ground connection member 23 is in elastic contact with the lower surface 4 c of the upper wall 4 a of the cover member 4.

  As described above, in the present embodiment, the hydraulic pressure control block 3 and the cover member 4 are electrically connected by the ground connection member 23, so that both the potentials 3 and 4 have the same potential. For this reason, since the electric noise transmitted from the circuit board 12 to the cover member 4 can be flowed to the hydraulic pressure control block 3 side, the electric noise in the cover member 4 can be effectively reduced.

  In addition, since the ground connection member 23 is always elastically contacted with the upper surface 3a of the hydraulic pressure control block 3 and the upper wall lower surface 4c of the cover member 4 by elastic deformation of both elastic deformation portions 25 and 26, vibration is generated. Even if it occurs, the continuity between the hydraulic control block 3 and the cover member 4 can always be maintained stably.

  In particular, since both the elastically deforming portions 25 and 26 are formed in a curved shape, the degree of freedom in the overall length of the ground connection member 23 is improved.

  As a result, even if vertical dimension errors or assembly errors occur in the hydraulic pressure control block 3, the cover member 4, and the bus bar structure 11, large bending in the length direction is caused by the curved shape of the elastic deformation portions 25 and 26. Since the deformation is possible, the errors can be absorbed, and positioning and assembly work are facilitated.

  Further, the ground connection member 23 can be firmly locked and fixed to the through hole 21 of the bus bar constituting body 11 via the clip pieces 27 and 27 and can be locked and fixed with one touch as described above. Is extremely easy.

  Further, since the ground connection member 23 is disposed in the dead space in the hydraulic pressure control block 3, the cover member 4, and the bus bar structure 11, the dead space can be effectively used.

  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 embodiment. For example, the ground connection member 23 can be connected to the hydraulic control block 3 from the cover member 4 via the printed circuit board 12. In this way, it is also possible to directly transmit electrical noise generated in the printer board 12 to the hydraulic pressure control block 3.

  Furthermore, for example, the shape and structure of the casing 1 and the bus bar structure 11 can be arbitrarily changed. In addition to the ABS, the application target device of the electronic control device can be applied to a traction control device.

  The elastic deformation portions 25 and 26 may be provided only at one end portion of the ground connection member 23.

The technical ideas of the invention other than the claims ascertained from the embodiment will be described below.
[Claim a]
The electronic control device according to claim 2, wherein the electrical connection member is formed in an elongated flat plate shape, and the elastic deformation portion is bent in a curved shape.

By forming the elastic deformation part in a curved shape, the degree of freedom of the length of the electrical connection member is improved, and even if the distance between the hydraulic control block and the cover member is changed, both are always electrically connected. A state is obtained.
[Claim b]
The locking portion includes: a plate-like main body formed substantially at the center of the electrical connection member; and a pair of locking pieces arranged in parallel to both side portions of the main body and elastically deforming to each other. The electronic control device according to claim 3, wherein each of the locking pieces is formed with a locking groove for locking to a hole edge of the through hole on an outer edge.
[Claim c]
The electronic control device according to claim 2, wherein the elastically deforming portion is formed at both end portions of the electrical connecting member.

  According to the present invention, since the elastic deformation portions are formed at both ends of the electrical connection member, each elastic deformation portion absorbs the error even when an assembly error occurs when the electrical connection member is assembled to the bus bar structure. Therefore, the assembling work is facilitated.

DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Electronic control mechanism 3 ... Fluid pressure control block 3a ... Upper surface 4 ... Cover member 4c ... Lower surface 5-6 ... Pressure increase, pressure-reduction valve 8 ... Coil unit 11 ... Bus-bar structure 12 ... Printed circuit board (circuit board)
DESCRIPTION OF SYMBOLS 19 ... Screw 20 ... Cylindrical part 21 ... Through-hole 23 ... Ground connection member (electrical connection member)
24 ... Base 25, 26 ... Elastic deformation part 27 ... Clip piece (locking part)
27b ... leg piece 27c ... locking groove

Claims (3)

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 hydraulic control devices,
The electronic control mechanism includes a synthetic resin material bus bar structure having a power electronic circuit for driving the hydraulic pressure control devices, and a circuit board for controlling the driving of the hydraulic pressure control devices via the bus bar structure. Consists of
An electronic control device comprising: an electrical connection member that electrically connects the hydraulic control block and the cover member via the bus bar structure.   The electrical connecting member extends between the hydraulic pressure control block and the cover member, and can be changed by deforming the length in the longitudinal direction at at least one of both ends in the longitudinal direction. The electronic control device according to claim 1, further comprising an elastic deformation portion.   A through hole through which the electrical connection member is inserted is formed in the bus bar structure, and a locking portion that elastically locks to a hole edge of the through hole at a predetermined position in the longitudinal direction of the electrical connection member The electronic control device according to claim 1, wherein the electronic control device is provided.

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