JP2015113072A - Electronic control unit, electric power steering device and vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic control unit whose height dimensions can be made lower without restricting mounting arrangement of an input/output substrate and a control substrate facing each other in a vertical direction by devising arrangement of discrete components such as an electrolytic capacitor and coil which are considered as tall electronic components, an electric power steering device using the same, and a vehicle on which the electric power steering device is mounted.SOLUTION: An electronic control unit comprises: power modules 60A, 60B; an input/output substrate 70 on which an input connector 71 and an output connector are mounted; and a control substrate 80. The output substrate 70 and the control substrate 80 are mounted so as to face each other in a vertical direction. A discrete component 73 with height H1 larger than half distance D/2 of an interval D between the input/output substrate 70 and the control substrate 80, etc. is mounted only on a surface 70e of the input/output substrate 70 facing the control substrate 80.

Description

  The present invention relates to an electronic control unit (ECU), an electric power steering device, and a vehicle, and in particular, an electronic control unit that controls driving of an electric motor, and an electric power steering device and an electric power steering device using the electronic control unit. It relates to the mounted vehicle.

  An electronic control unit in an electric power steering apparatus mounted on a vehicle controls driving of an electric motor, and is a control in which a power module having a switching element and a control device for controlling an output current of the power module are mounted. And a substrate. The power module is electrically connected to the electric motor via the output connector, and the control board is electrically connected to a vehicle battery, a torque sensor, and the like.

Here, the electronic control unit and the electric motor are required to be miniaturized in order to flexibly correspond to the vehicle mounting position corresponding to the vehicle type. In order to meet this requirement, an electric power steering device in which an electronic control unit and an electric motor shown in Patent Document 1 are integrated has been proposed.
The electronic control unit in the electric power steering apparatus of Patent Document 1 is provided with a power module equipped with a switching element, a control module for controlling the output current of the power module, and a power terminal block to which power is supplied from a battery. A DC conductor module and an AC conductor module provided with a motor terminal block for supplying electric power to the electric motor are provided.

The power module is screwed onto the metal casing, and the DC conductor module and the AC conductor module are arranged above the power module and are respectively screwed to the metal casing. The control module is disposed above the DC conductor module and the AC conductor module and is screwed to the metal casing.
Here, on the power module, discrete components such as switching devices and shunt resistors, which are low-height electronic components, and discrete components such as relays and jumper leads, which are high-height electronic components, are mounted. On the other hand, discrete parts that are large and tall electronic parts such as electrolytic capacitors, relays, and normal filters are mounted on the lower surface of the bus bar of the DC conductor module that is arranged to face the power module in the vertical direction. . In order to reduce the height dimension of the electronic control unit, the power module and the DC conductor module are arranged so that the above-described tall discrete components do not interfere with each other.

JP 2010-30489 A

However, the conventional electronic control unit in the electric power steering apparatus of Patent Document 1 has the following problems.
That is, in order to reduce the height dimension of the electronic control unit, it is necessary to dispose the power module and the DC conductor module facing each other in the vertical direction so that the tall discrete components do not interfere with each other. There was a limit to the mounting position of the conductor module.

  Therefore, the present invention has been made to solve this conventional problem, and its purpose is to devise the arrangement of discrete electronic components such as electrolytic capacitors and coils, which can be moved up and down. Electronic control unit capable of reducing height of electronic control unit without restricting mounting arrangement of input / output board and control board opposed to each other, electric power steering apparatus and electric power steering apparatus using the same The purpose is to provide an onboard vehicle.

  In order to solve the above problems, an electronic control unit according to an aspect of the present invention includes a power module incorporating a switching element, an input / output board on which an input connector and an output connector are mounted, and an output current of the power module. A control board mounted with a control device for controlling the input / output board, the input / output board and the control board are mounted so as to face each other in the vertical direction, and only the surface of the input / output board facing the control board is mounted. In addition, a discrete component having a height greater than a half of the distance between the input / output board and the control board is mounted.

In the electronic control unit, the discrete component faces the control board so that a height direction thereof is the vertical direction perpendicular to a direction in which a surface of the input / output board facing the control board extends. It is preferable that it is mounted on the surface.
Further, in the electronic control unit, the discrete component has a surface facing the control board so that a height direction thereof is substantially parallel to a direction in which a surface of the input / output board facing the control board extends. May be implemented.

In this electronic control unit, it is preferable that an opening into which the discrete component can enter is formed in the control board.
An electric power steering apparatus according to an aspect of the present invention includes any one of the electronic control units described above.
Furthermore, a vehicle according to an aspect of the present invention is characterized by mounting the above-described electric power steering device.

  According to the electronic control unit, the electric power steering apparatus, and the vehicle according to the present invention, the height of the discrete component that is a tall electronic component, that is, a height that is greater than half the distance between the input / output substrate and the control substrate. Discrete parts having the above are mounted only on the surface of the input / output board facing the control board among the input / output board and the control board mounted so as to face each other in the vertical direction. The height dimension of the electronic control unit can be reduced without restricting the mounting arrangement of the input / output board and the control board.

It is a figure which shows the basic structure of the electric power steering apparatus with which the electronic control unit as a motor control apparatus which concerns on this invention is used. It is a block diagram which shows the control system of the motor control apparatus of the electric power steering apparatus shown in FIG. It is a disassembled perspective view which shows the internal structure of the electronic control unit as a motor control apparatus. It is a perspective view which shows the external appearance structure of an electronic control unit. It is the 1st side view seen from the direction of arrow L1 of FIG. It is the 2nd side view seen from the direction of arrow L2 of FIG. It is a perspective view which extracts and shows the power module of FIG. It is the figure seen from the direction of arrow L3 of FIG. It is sectional drawing which shows the schematic structure of a housing | casing typically. It is a perspective view in the state where electronic parts (discrete parts) were mounted on the input / output board of the electronic control unit. It is the front view seen from the direction of arrow L4 of FIG. It is the 1st side view seen from the direction of arrow L5 of FIG. 10 (the same direction as the direction of arrow L2). It is the 2nd side view seen from the direction of arrow L6 of FIG. 10 (the same direction as the direction of arrow L1). It is the bottom view seen from the direction of arrow L7 of FIG. FIG. 11 is a perspective view of a state in which an input / output board on which an electronic component (discrete part) shown in FIG. 10 is mounted and a control board are connected by first and second power modules. It is the front view seen from the direction of the arrow L8 of FIG. 15 (the same direction as the direction of the arrow L4). It is the 1st side view seen from the direction of arrow L9 of FIG. 15 (the same direction as the direction of arrow L5). It is the 2nd side view seen from the direction of arrow L10 of FIG. 15 (the same direction as the direction of arrow L6). It is the bottom view seen from the direction of arrow L11 of FIG. 15 (the same direction as the direction of arrow L7).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a basic structure of an electric power steering apparatus in which an electronic control unit as a motor control apparatus according to the present invention is used.
The electric power steering apparatus shown in FIG. 1 is mounted on a vehicle such as an automobile. In this electric power steering apparatus, the steering force applied to the steering wheel 1 from the driver is transmitted to the steering shaft 2. The steering shaft 2 has an input shaft 2a and an output shaft 2b. One end of the input shaft 2 a is connected to the steering wheel 1, and the other end is connected to one end of the output shaft 2 b via the steering torque sensor 3.

  The steering force transmitted to the output shaft 2 b is transmitted to the lower shaft 5 via the universal joint 4 and further transmitted to the pinion shaft 7 via the universal joint 6. The steering force transmitted to the pinion shaft 7 is transmitted to the tie rod 9 via the steering gear 8 and steers steered wheels (not shown). Here, the steering gear 8 is configured in a rack and pinion type having a pinion 8a connected to the pinion shaft 7 and a rack 8b meshing with the pinion 8a, and the rack 8b transmits the rotational motion transmitted to the pinion 8a. It has been converted to a straight motion in the width direction.

A steering assist mechanism 10 for transmitting a steering assist force to the output shaft 2b is connected to the output shaft 2b of the steering shaft 2. The steering assist mechanism 10 is an electric motor composed of, for example, a three-phase brushless motor that generates a steering assist force coupled to the reduction gear 11 and a reduction gear 11 composed of, for example, a worm gear mechanism coupled to the output shaft 2b. 12.
The steering torque sensor 3 detects the steering torque applied to the steering wheel 1 and transmitted to the input shaft 2a. For example, the steering torque sensor 3 converts the steering torque into a deflection angle displacement of a torsion bar (not shown) interposed between the input shaft 2a and the output shaft 2b, and this deflection angle displacement is arranged on the input shaft 2a side. It detects by converting into an angle difference between an input side angle sensor (not shown) and an output side angle sensor (not shown) arranged on the output shaft 2b side.

  In addition, the electric motor 12 is constituted by, for example, a three-phase brushless motor, and as shown in FIG. Lb and Lc are wound. One end of each phase motor winding La, Lb, and Lc is connected to each other to form a star connection, and the other end is connected to the motor control device 20 to be supplied with motor drive currents Ia, Ib, and Ic.

As shown in FIG. 2, the electric motor 12 is provided with a rotational position sensor 13a for detecting the rotational position of the motor, and the detected value from the rotational position sensor 13a is supplied to the motor rotational angle detection circuit 13 to be supplied to the motor. The rotation angle detection circuit 13 detects the motor rotation angle θm.
Further, a direct current is input to the motor control device 20 from a battery 22 as a direct current power source.

Here, as shown in FIG. 2, the motor control device 20 includes a control arithmetic device 31 for calculating three-phase voltage command values V1 ^* _and V2 ^*, and a three-phase voltage command value output from the control arithmetic device 31. First and second motor drive circuits 32A and 32B to which V1 ^* and V2 ^* are input, first and second motor drive circuits 32A and 32B, and multiphase motor windings La, Lb and Lc of electric motor 12 And first and second motor current cut-off circuits 33A and 33B.

The control arithmetic unit 31 includes the steering torque detected by the steering torque sensor 3, the vehicle speed detected by the vehicle speed sensor 21, the motor rotation angle θm output from the motor rotation angle detection circuit 13, the motor angular velocity, and the motor angular acceleration. Entered. The control arithmetic unit 31 receives motor drive currents I1a to I1c and I2a to I2c that are supplied from the current detection circuits 39A and 39B and are supplied to the phase motor windings La, Lb, and Lc of the electric motor 12. Is done. Then, the control arithmetic unit 31 determines the three-phase voltage command value V1 for the first and second motor drive circuits 32A and 32B based on the steering torque, the vehicle speed, the motor rotation angle θm, the motor angular velocity, and the motor angular acceleration. ^{* And} V2 ^* are calculated, and the calculated three-phase voltage command values V1 ^* and V2 ^* are output to the gate drive circuits 41A and 41B described later of the first and second motor drive circuits 32A and 32B.

  Further, the control arithmetic unit 31 includes an open failure of the upper arm of the field effect transistors (FETs) Q1 to Q6 as switching elements constituting first and second inverter circuits 42A and 42B, which will be described later, and a short circuit of the lower arm. An abnormality detection unit 31a is provided for detecting a failure and disconnection abnormality of the coil portions of the respective phase motor windings La, Lb and Lc of the electric motor 12. In this abnormality detection unit 31a, when the open failure and the short failure of the field effect transistors (FETs) Q1 to Q6 are not detected, the abnormality detection signals SAa and SAb having the logical value “0” (normal) are output from the motor drive circuits 32A and 32B. Outputs to gate drive circuits 41A and 41B, and detects an abnormal detection signal SAa or SAb of logical value "1" (abnormal) when open failure and short circuit failure of field effect transistors (FET) Q1-Q6 are detected Output to the gate drive circuit 41A or 41B of the motor drive circuit 32A or 32B.

Each of the first and second motor drive circuits 32A and 32B receives the three-phase voltage command values V1 ^* and V2 ^* output from the control arithmetic unit 31 to form a gate signal, and performs current control during abnormality. Gate drive circuits 41A and 41B that also serve as a unit, and first and second inverter circuits 42A and 42B to which gate signals output from these gate drive circuits 41A and 41B are input.

  Here, when the abnormality detection signal SAa input from the control arithmetic unit 31 is a logical value “0” (normal), the gate drive circuit 41A outputs three high-level gate signals to the motor current cutoff circuit 33A. At the same time, a high-level gate signal is output to the current interrupt circuit 44A. Further, when the abnormality detection signal SAa has a logical value “1” (abnormal), the gate drive circuit 41A outputs three low-level gate signals to the motor current cutoff circuit 33A at the same time, and motor drive currents I1a to I1c. And a low level gate signal is output to the current interrupt circuit 44A to interrupt the battery current.

  Similarly, when the abnormality detection signal SAa input from the control arithmetic unit 31 is a logical value “0” (normal), the gate drive circuit 41B outputs three high-level gate signals to the motor current cutoff circuit 33B. At the same time, a high-level gate signal is output to the current interrupt circuit 44B. Further, when the abnormality detection signal SAa has a logical value “1” (abnormal), the gate drive circuit 41B outputs three low-level gate signals to the motor current cutoff circuit 33B at the same time, and the motor drive currents I2a to I2c. And a low level gate signal is output to the current interrupt circuit 44B to interrupt the battery current.

Further, the battery current of the battery 22 is input to the first and second inverter circuits 42A and 42B via the noise filter 43 and the power cutoff circuits 44A and 44B, respectively, and a smoothing electrolytic capacitor CA and CB is connected.
Each of the first and second inverter circuits 42A and 42B has field effect transistors (FETs) Q1 to Q6 as six switching elements, and includes three field effect transistors connected in series. The switching arms SAa, SAb and SAc are connected in parallel. A gate signal output from the gate drive circuit 41A is input to the field effect transistors Q1 to Q6 constituting the first inverter circuit 42A, so that A is applied between the field effect transistors of the switching arms SAa, SAb, and SAc. The phase motor drive current I1a, the B phase motor drive current I1b, and the C phase motor drive current I1c are energized to the respective phase motor windings La, Lb, and Lc of the electric motor 12 through the motor current cutoff circuit 33A. In addition, when the gate signal output from the gate drive circuit 41B is input to the field effect transistors Q1 to Q6 constituting the second inverter circuit 42B, A to the field effect transistors between the switching arms SAa, SAb, and SAc. The phase motor drive current I2a, the B phase motor drive current I2b, and the C phase motor drive current I2c are supplied to the respective phase motor windings La, Lb, and Lc of the electric motor 12 through the motor current cutoff circuit 33B.

The motor current cut-off circuit 33A includes three current cut-off field effect transistors QA1 to QA3, and the motor current cut-off circuit 33B includes three current cut-off field effect transistors QB1 to QB3. Has been.
Next, the configuration of the electronic control unit 50 as the motor control device 20 will be described with reference to FIGS. 3 to 9.

3 to 9, mainly, the electronic control unit 50 includes first and second power modules 60A and 60B, an input / output board 70, a control board 80, and a casing 90 for housing them. ing.
The first power module 60A includes a motor current cutoff circuit 33A, a first inverter circuit 42A composed of a plurality of switching elements, a power cutoff circuit 44A, and the like. The second power module 60B mainly includes a motor current cut-off 33B, a second inverter circuit 42B composed of a plurality of switching elements, a power cut-off circuit 44B, and the like.

  A power input connector (input connector) 71 and a three-phase output connector (output connector) 72 are mounted on the input / output board 70, and coils 73 a and 73 b constituting the electrolytic capacitors CA and CB and the noise filter 43 are mounted. In addition, an electronic component (discrete component) 73 such as a resistor and a three-terminal regulator is also mounted. The mounting of the electronic component 73 on the input / output board 70 will be described in detail later.

  The control board 80 includes a control arithmetic unit 31 as a control unit that controls output currents of the first and second power modules 60A and 60B, a gate drive unit 82A equipped with a gate drive circuit 41A, and a gate drive circuit 41B. The gate driving device 82B is mounted, and electronic components such as a capacitor, a resistor, and a signal input connector 81 are also mounted. The control board 80 and the input / output board 70 have, for example, a multilayer wiring structure in which wiring layers are provided on the front and back surfaces or the front and back surfaces and the inner layer.

The housing 90 is mainly configured by a case 91 and a cover 92, and the first and second power modules 60A and 60B, the input / output board 70, the control board 80, and the like are provided in a storage portion formed by the case 91 and the cover 92. Is housed. The case 91 and the cover 95 are formed of a conductive metal material, for example, aluminum die cast (ADC).
The case 91 includes a ceiling portion 92, a side wall portion 93 provided integrally with the edge of the ceiling portion 92 so as to surround the center of the ceiling portion 92, and an opening provided on the opposite side of the ceiling portion 92. The cover 95 is attached so as to cover the opening. The case 91 is formed in a square shape in plan view, and has four side wall portions 93 (93a, 93b, 99c, 93d). Of the four side wall portions 93a, 93b, 93c, and 93d, each of the two side wall portions 93a and 93b faces each other in the first direction (left-right direction), and each of the remaining two side wall portions 93c and 93d is the first one. They are opposed to each other in a second direction (front-rear direction) perpendicular to the first direction.

  Each of the first and second power modules 60 </ b> A and 60 </ b> B is screwed and fixed to the two side wall portions 93 c and 93 d of the case 91 facing each other by a screw member 65 from the inside. Further, the input / output board 70 is fixed to the ceiling 92 of the case 91 by screws from the inside with a screw member 75. Further, the control board 80 is fixed to the ceiling portion 92 of the case 91 with screws from the inside by a screw member 85. The cover 95 is fixed to the side wall portions 93a, 93b, 93c, and 93d of the case 91 with screws from the outside by screw members 96. The input / output board 70 and the control board 80 face each other with a predetermined distance D (see FIG. 9) in the thickness direction of the electronic control unit 50, that is, the vertical direction. In FIG. 3, the upper side is “upper”, the lower side is “lower”, and the input / output board 70 is disposed above the control board 80.

The three-phase output connector 72 of the input / output board 70 is exposed to the outside from the side wall portion 93a of the case 91 (see FIGS. 4 and 5). The power input connector 71 of the input / output board 70 and the signal input connector 81 of the control board 80 are exposed to the outside from the side wall surface 93b of the case 91 (see FIG. 6).
7 and 8, each of the first and second power modules 60A and 60B includes a sealing body 61, a plurality of first leads 63, and a plurality of second leads 64. have. Each of the first and second power modules 60A and 60B has a two-way lead array type package structure.

  The sealing body 61 is formed in a rectangular shape when viewed in plan, and in this embodiment, for example, is formed in a rectangle having two long sides 61a and 61b and two short sides 61c and 61d. The sealing body 61 is made of, for example, an insulating resin or ceramics. The sealing body 61 of the first power module 60A mainly seals the switching elements constituting the first inverter circuit 42A. The sealing body 61 of the second power module 60B mainly seals the switching elements and the like constituting the second inverter circuit 42B.

Although not shown in detail, each of the plurality of first and second leads 63 and 64 extends over the inside and outside of the sealing body 61 and includes an internal lead portion positioned inside the sealing body 61. And an external lead portion located outside the sealing body 61.
Each of the plurality of first leads 63 is disposed along one long side 61 a of the two long sides 61 a and 61 b of the sealing body 61 in the external lead portion located outside the sealing body 61. ing. Each of the plurality of second leads 64 is arranged along the other long side 61 b of the two long sides 61 a and 61 b of the sealing body 61 in the external lead portion located outside the sealing body 61. ing.

Each of the plurality of first and second leads 63 and 64 is bent in a plurality of stages at an external lead portion located outside the sealing body 61.
Each of the external lead portions of the plurality of first leads 63 is bent, for example, in three steps, and protrudes from one long side 61a side of the sealing body 61, and the first portion 63a. The second portion 63b is bent from 63a in the thickness direction of the sealing body 61, and the third portion 63c is bent from the second portion 63b to the back surface side of the sealing body 61.

The external lead portions of each of the plurality of second leads 64 are bent, for example, in two steps, and project from the other long side 61b side of the sealing body 61, and the first portion 64a. And a second portion 64b that is bent so as to be inclined toward the back surface side of the sealing body 61.
In the first and second power modules 60A and 60B, each of the plurality of first leads 63 is, for example, soldered to the wiring of the input / output board 70 and is electrically and mechanically connected. Each of the plurality of second leads 64 is soldered, for example, to the wiring of the control board 80 and is electrically and mechanically connected.

  Here, in the plurality of leads 63, the leads 63 electrically connected to the terminals of the power input connector 71 and the terminals of the three-phase output connector 72 are electrically connected via the wiring of the input / output board 70. A lead 63 to be connected is included. The plurality of leads 64 include leads 64 that are electrically connected to the terminals of the signal input connector 81 via the wiring of the control board 80.

  The electronic control unit 50 configured as described above is mounted on the end surface of the electric motor 12 opposite to the output shaft 12a, and is fixed by screws with a screw member (not shown). As shown in FIGS. 3 to 6, a plurality of boss portions 95 b are formed on the lower surface of the cover 95 that constitutes the electronic control unit 50. When the electronic control unit 50 is mounted on the electric motor 12, the boss portions 95b are placed on the plurality of first mounting flange portions 12b provided on the electric motor 12, and the lower surface of the cover 95 is connected to the output shaft 12a. Is placed on the opposite end face. Then, the electronic control unit 50 is mounted on the electric motor 12 by fixing the first mounting flange portion 12b and the boss portion 95b with a screw member (not shown). Note that a plurality of second mounting flange portions 12 c to other members are provided on the output shaft 12 a side of the electric motor 12.

Next, a manufacturing method (assembly method) of the electronic control unit 50 will be described with reference to FIG.
First, the first and second power modules 60A and 60B, the input / output board 70, the control board 80, the case 91, and the cover 95 are prepared. The input / output board 70 is an electronic component (discrete component) such as a power input connector 71, a three-phase output connector 72, electrolytic capacitors CA and CB, coils 73a and 73b constituting a noise filter 43, a resistor, and a three-terminal regulator. 73 is implemented. Electronic components such as a control device (control arithmetic device 31) and a gate drive device (gate drive circuits 41A and 41B) for controlling output currents of the first and second power modules 60A and 60B are mounted on the control board 80. Furthermore, electronic components such as a capacitor, a resistor, and a signal input connector 81 are mounted.

Next, the first and second power modules 60 </ b> A and 60 </ b> B are individually screwed and fixed to the side wall portions 93 c and 93 d of the case 91 from the inside by the screw members 65.
Next, the input / output board 70 is fixed to the ceiling portion 92 of the case 91 with a screw member 75 from the inside. A plurality of screw through holes 70c are formed in the input / output board 70, and the screw member 75 is inserted into the screw through holes 70c when screwing and fixing. Further, when the input / output board 70 is screwed and fixed to the ceiling portion 92 of the case 91, the plurality of first leads 63 of the first and second power modules 60A, 60B are formed on the wiring of the input / output board 70. Is inserted through a through hole (not shown).

  Next, the control board 80 is fixed to the ceiling portion 92 of the case 91 with a screw member 85 from the inside. A plurality of screw through holes 80a are formed in the control board 80, and the screw member 85 is inserted into the screw through hole 80a when fixing with screws. Further, when the control board 80 is screwed and fixed to the ceiling portion 92 of the case 91, the plurality of second leads 64 of the first and second power modules 60A and 60B are formed on the wiring of the control board 80. Insert through a through hole (not shown).

  Next, the plurality of first leads 63 of the first and second power modules 60A and 60B are electrically and mechanically connected to the through holes formed in the wiring of the input / output substrate 70 by soldering, and at the same time The plurality of second leads 64 of the first and second power modules 60A and 60B are electrically and mechanically connected to through holes formed in the wiring of the control board 80 by solder.

Next, the cover 95 is attached so as to cover the opening portion of the case 91, and is fixed to the side wall portion 93 of the case 91 with a screw member 96 from the outside of the cover 95. A plurality of screw through holes 95a are formed in the cover 95, and the screw member 96 is inserted into the screw through holes 95a when fixing with screws.
Thereby, the electronic control unit 50 of this embodiment is almost completed.

  In this electronic control unit 50, as shown in FIG. 9, the input / output board 70 and the control board 80 are arranged to face each other with a predetermined distance D in the thickness direction of the electronic control unit 50, that is, the vertical direction. Has been. In the present embodiment, the input / output board 70 is arranged on the ceiling 92 side of the case 91 with respect to the control board 80, and the control board 80 is arranged on the cover 95 side, that is, below the input / output board 70.

The input / output board 70 is formed with a plane size smaller than that of the control board 80. The input / output board 70 has two sides 70a and 70b facing each other, and the control board 80 has two sides 80aa and 80bb facing each other.
One side 70a of the input / output board 70 is located on the same side as the one side 80aa of the control board 80, and is located inside the one side 80aa. The other side 70b of the input / output board 70 is located on the same side as the other side 80bb of the control board 80, and is located inside the other side 80bb.

  The first power module 60A is arranged on one side 70a, 80aa side of each of the input / output board 70 and the control board 80 so as to cross one side 70a of the input / output board 70. The second power module 60B is arranged on the other side 70a, 80aa side of each of the input / output board 70 and the control board 80 so as to cross the other side 70b of the input / output board 70.

Next, the mounting of the electronic component (discrete component) on the input / output board and the relationship between the input / output board on which the electronic component is mounted and the control board will be described with reference to FIGS.
As described above, the electronic component 73 mounted on the input / output substrate 70 side is a discrete component such as the electrolytic capacitors CA and CB, the coils 73a and 73b constituting the noise filter 43, the resistor, and the three-terminal regulator. Among the discrete components, the electrolytic capacitors CA and CB and the coils 73a and 73b constituting the noise filter 43 are electronic components 73 having a high height. That is, the height H1 of the coil 73a, the height H2 of the coil 73b, and the height H3 of the electrolytic capacitors CA and CB shown in FIG. Is larger than the distance 2 / D, which is half the distance D between the two (see FIGS. 9 and 17).

  The discrete components such as the coils 73a and 73b and the electrolytic capacitors CA and CB, which are the tall electronic components 73, are provided only on the surface of the input / output substrate 70 facing the control substrate 80, that is, the lower surface 70e of the input / output substrate 70. As shown in FIGS. 10 to 19, it is not mounted on the upper surface 70d of the input / output substrate 70 or the upper surface 80b and the lower surface 80c of the control substrate 80.

As described above, the discrete components, which are the tall electronic components 73, are mounted only on the surface of the input / output board 70 that faces the control board 80, that is, the lower surface 70e of the input / output board 70, thereby facing each other in the vertical direction. Without limiting the mounting arrangement of the input / output board 70 and the control board 80, the height of the electronic control unit 50 can be reduced.
That is, by mounting a discrete component, which is a tall electronic component 73, on the surface (lower surface 70 e) of the input / output substrate 70 that faces the control substrate 80, a space between the input / output substrate 70 and the control substrate 80 is obtained. It can be used for mounting discrete components that are tall electronic components 73, and the height of the electronic control unit 50 can be reduced. Further, as described in Patent Document 1, such discrete components are distributed between a surface (lower surface 70e) facing the control board 80 of the input / output board 70 and a surface (upper face 80b) facing the input / output board 70 of the control board 80. As a result, the electronic control unit 50 can be reduced in height, but in order to avoid contact between the discrete components provided on both the boards 70 and 80, the mounting arrangement of the input / output board 70 and the control board 80 is reduced. There is a disadvantage of being limited.

The discrete component, which is a tall electronic component 73, has a vertical direction that is perpendicular to the direction in which the surface (lower surface 70e) of the input / output substrate 70 facing the control substrate 80 extends. It is mounted on the surface (lower surface 70e) facing the control board 80.
Here, the height H1 of the coil 73a among the discrete parts that are the tall electronic parts 73 is larger than the interval D between the input / output board 70 and the control board, as shown in FIG. The coil 73a is mounted on the lower surface 70e of the input / output board 70 so that the height direction thereof is the vertical direction. For this reason, the tip of the mounted coil 73 a comes into contact with the control board 80. However, as shown in FIG. 19, the control board 80 has an opening (through hole) 83 into which the coil 73a can enter. For this reason, the tip of the mounted coil 73 a passes through the opening 83 of the control board 80 and protrudes from the lower surface 80 c of the control board 80.

  Accordingly, when the height of the discrete component that is the tall electronic component 73 is larger than the distance D between the input / output substrate 70 and the control substrate 80, the opening (in which the discrete component can enter the control substrate 80) If the through-hole 83 is not formed, it is necessary to increase the distance D between the input / output board 70 and the control board 80 facing each other in the vertical direction. When the height of a discrete component, which is a tall electronic component 73, is larger than the distance D between the input / output substrate 70 and the control substrate 80, an opening 83 into which the discrete component can enter is formed in the control substrate 80. By doing so, the height dimension of the electronic control unit 50 can be reduced without increasing the distance D between the input / output board 70 and the control board 80.

In addition, as shown in FIG. 19, the opening (through hole) 83 can also enter the coil 73b. As shown in FIG. 17, since the tip of the coil 73b is also in contact with the upper surface 80b of the control board 80, the opening (through hole) 83 can also enter the coil 73b.
Further, the discrete component which is the electronic component 73 having a high height is arranged so that the height direction thereof is substantially parallel to the direction in which the surface (the lower surface 70e) of the input / output substrate 70 facing the control substrate 80 extends, that is, the discrete component. You may mount in the surface (lower surface 70e) which opposes the control board 80 so that components may lie down. A discrete component, which is an electronic component 73 having a high height, is mounted on a surface (lower surface 70e) facing the control board 80 so as to lie down, so that the distance between the input / output board 70 and the control board 80 facing each other in the vertical direction is reduced. D can be made smaller, and the height dimension of the electronic control unit 50 can be made smaller.

As mentioned above, although embodiment of this invention has been described, this invention is not limited to this, A various change and improvement can be performed.
For example, the control board 80 is arranged on the cover 95 side, that is, below the input / output board 70, but the control board 80 may be arranged on the upper side of the input / output board 70. In this case, a discrete component that is a tall electronic component 73 is mounted only on the upper surface of the input / output board 70.

  DESCRIPTION OF SYMBOLS 1 ... Steering wheel, 2 ... Steering shaft, 2a ... Input shaft, 2b ... Output shaft, 3 ... Steering torque sensor, 4 ... Universal joint, 5 ... Lower shaft, 6 ... Universal joint, 7 ... Pinion shaft, 8 ... Steering gear 8a ... pinion, 8b ... rack, 9 ... tie rod, 10 ... steering assist mechanism, 11 ... reduction gear, 12 ... electric motor, 12a ... output shaft, 12b ... first mounting flange, 12c ... second mounting flange, DESCRIPTION OF SYMBOLS 13 ... Motor rotation angle detection circuit, 13a ... Rotation position sensor, La ... A phase motor winding, Lb ... B phase motor winding, Lc ... C phase motor winding, 20 ... Motor controller, 21 ... Vehicle speed sensor, 22 ... battery, 31 ... control arithmetic unit, 32A ... first motor drive circuit, 32B ... second motor drive circuit, 33A ... first motor Current cutoff circuit, 33B ... second motor current cutoff circuit, 39A, 39B ... current detection circuit, 41A, 41B ... gate drive circuit, 42A, 42B ... inverter circuit, 43 ... noise filter, 44A, 44B ... power cutoff circuit, 50 ... electronic control unit, 60A ... first power module, 60B ... second power module, 61 ... sealed body, 61a, 61b ... long side, 61c, 61d ... short side, 63 ... first lead, 63a ... 1st part, 63b ... 2nd part, 63c ... 3rd part, 64 ... 2nd lead, 64a ... 1st part, 64b ... 2nd part, 65 ... Screw member, 70 ... Input / output Boards 70, 70c ... Screw through holes, 70d ... Upper surface of the input / output board, 70e ... Lower face of the input / output board, 71 ... Power input connector (input connector), 72 ... Three-phase output connector (output) Connector) 73 ... electronic component (discrete component) 73a ... coil, 73b ... coil, 75 ... screw member, 80 ... control board, 80a ... through hole for screw, 80b ... upper surface of control board, 80c ... lower surface of control board, DESCRIPTION OF SYMBOLS 81 ... Connector for signal input, 82A ... Gate drive device, 82B ... Gate drive device, 83 ... Opening, 85 ... Screw member, 90 ... Housing, 91 ... Case, 92 ... Ceiling part, 93a, 93b, 93c, 93d ... Side wall part, 95 ... cover, 95a ... through hole for screw, 95b ... boss part, 96 ... screw member

In order to solve the above problems, an electronic control unit according to an embodiment of the present invention includes a power module incorporating a switching element, an input / output board on which an input connector and an output connector are mounted, and an output current of the power module. A control board mounted with a control device for controlling the power supply, a housing for housing the power module, the input / output board, and the control board, so that the input / output board and the control board face each other in the vertical direction. In addition, a discrete component having a height greater than half the distance between the input / output board and the control board is mounted only on the surface of the input / output board facing the control board. And the housing includes a mounting portion and a ceiling portion that are spaced apart and face each other in one direction, and four or more sides located between the mounting portion and the ceiling portion. And a part, a sloped sidewall portion inclined inwardly at an acute angle relative to at least one of the attachment portions of the four or more side wall portions.

In the electronic control unit, the input / output board and the control board are arranged to face each other at a predetermined interval in the one direction, and the power module includes a sealing body having a rectangular plane. A plurality of first leads arranged along one side of two sides located on opposite sides of the sealing body, and the other side of the two sides of the sealing body. A plurality of second leads disposed along the first lead, the first lead connected to the input / output substrate, the second lead connected to the control substrate, and the sealing body It is preferable to incline along the inclined side wall.
In the electronic control unit, the discrete component faces the control board so that a height direction thereof is the vertical direction perpendicular to a direction in which a surface of the input / output board facing the control board extends. It is preferable that it is mounted on the surface.
Further, in the electronic control unit, the discrete component has a surface facing the control board so that a height direction thereof is substantially parallel to a direction in which a surface of the input / output board facing the control board extends. May be implemented.

Claims (6)

A power module incorporating a switching element, an input / output board on which an input connector and an output connector are mounted, and a control board on which a control device for controlling the output current of the power module is mounted,
The input / output board and the control board are mounted so as to face each other in the vertical direction, and the gap between the input / output board and the control board is provided only on the face of the input / output board facing the control board. An electronic control unit comprising a discrete component having a height greater than half the distance.   The discrete component is mounted on a surface facing the control board so that a height direction thereof is the vertical direction perpendicular to a direction in which a surface of the input / output board facing the control board extends. The electronic control unit according to claim 1.   The discrete component is mounted on a surface facing the control board so that a height direction thereof is substantially parallel to a direction in which a surface of the input / output board facing the control board extends. The electronic control unit according to claim 1.   The electronic control unit according to claim 1, wherein an opening through which the discrete component can enter is formed in the control board.   An electric power steering apparatus comprising the electronic control unit according to any one of claims 1 to 4.   An electric power steering apparatus according to claim 5 is mounted.

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