JP7406301B2 - electronic control unit - Google Patents

Description

The present invention relates to an electronic control device using a bendable multilayer wiring board that can be assembled into a housing in a bent state.

Patent Document 1 discloses a circuit board to be incorporated into a motor unit of a power steering device, in which a plurality of rigid board parts are connected by a bending part that is thinner and more flexible than the rigid board parts to form a substantially U-shape. A circuit board that can be used in a folded form is disclosed.

Japanese Patent Application Publication No. 2010-105640

In a circuit board having a bent part as described above, the partially thinned bent part is interposed between the rigid board parts, so the mounting layout and wiring layout of electronic components as a whole of the circuit board is affected. There is a risk of being restricted. That is, there is a problem of how to layout electronic components and wiring in a control system of an electric actuator that includes a detection element such as a rotation sensor that detects the operating state of the electric actuator.

According to the present invention, in one aspect, an electronic control device that drives and controls an electric actuator having two drive units includes a single sheet of wiring that has a plurality of wiring layers and an insulating layer that insulates between these wiring layers. Equipped with a multilayer wiring board. The multilayer wiring board is located between first and second component mounting sections on which electronic components are mounted and the first and second component mounting sections, and has fewer wiring layers than these component mounting sections. , mounted on a flexible part that has higher flexibility than the first and second component mounting parts due to a relatively thin board thickness, and the first component mounting part, and detects the operating state of the electric actuator. and a detection signal line formed in a wiring layer of the flexible section and transmitting a signal of the detection element from the first component mounting section to the second component mounting section, is shared by two control systems corresponding to each drive section of the electric actuator, and the first component mounting section branches the detection signal of the detection element into two systems, and then these two detection signals are The first component mounting is configured to be sent to the second component mounting section via the detection signal line in the flexible section and input to each control system, and configures each of the two control systems of the electric actuator. A group of electronic components mounted on the second component mounting section and a CPU mounted on the second component mounting section are arranged along the wiring direction of the detection signal line.

In such a configuration, the electronic component group in the first component mounting section and the CPU in the second component mounting section are arranged along the wiring direction of the detection signal line for the detection element in the flexible section, resulting in a complicated wiring layout. The electronic components constituting the control system can be efficiently arranged while suppressing the amount of noise.

FIG. 1 is an exploded perspective view of an electric actuator device for a power steering device incorporating a circuit board according to the present invention. A sectional view of an electric actuator device. FIG. 3 is a perspective view of the circuit board in a folded state. FIG. 3 is a side view of the circuit board in a folded state. FIG. 3 is a cross-sectional view of the circuit board in an expanded state. FIG. 3 is a plan view showing the first surface of the circuit board in an expanded state. FIG. 7 is a plan view showing the second surface of the circuit board in an expanded state. FIG. 7 is a plan view showing a wiring pattern on the surface layer on the second surface side of the flexible part. FIG. 7 is a plan view showing a wiring pattern in the inner layer on the second surface side of the flexible part. FIG. 2 is a circuit diagram showing the configuration of an inverter circuit.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to, for example, a control device for an electric power steering device for an automobile will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view of an electric actuator device that provides a steering assist force to a steering mechanism (not shown) in an electric power steering device. Moreover, FIG. 2 is a sectional view of the electric actuator device. This electric actuator device integrates a cylindrical motor section 1, an inverter/power module 2, a circuit board 3 made of a bendable multilayer wiring board which is an embodiment of the present invention, and a plurality of connectors. and a motor cover 5 attached to one end of the motor section 1 so as to cover the inverter/power module 2, circuit board 3, and connector member 4.

In the motor section 1, a motor 1A (FIG. 2) corresponding to an electric actuator consisting of a stator 1B and a rotor 1C is housed inside a cylindrical housing 7, and a rotating shaft 6 protrudes from the front end surface of the housing 7. It has a connecting part 6a such as a gear or a spline at the tip thereof, and is connected to a steering mechanism (not shown) via this connecting part 6a. The motor 1A is a three-phase permanent magnet brushless motor, and the stator 1B includes three-phase coils, and permanent magnets are arranged on the outer peripheral surface of the rotor 1C. Here, the motor 1A includes two systems of coils and corresponding permanent magnets to provide redundancy.

One end portion of the housing 7 opposite to the connecting portion 6a is configured as a bottom wall portion 7a having a horseshoe-shaped outline with a portion of the outer periphery extending in the radial direction, and covers this bottom wall portion 7a. As such, a motor cover 5 having a horseshoe-shaped outline corresponding to the bottom wall portion 7a is attached. In the space defined between the bottom wall portion 7a and the motor cover 5, the inverter power module 2, the circuit board 3, and the connector member 4 are accommodated in an overlapping manner in the axial direction of the rotating shaft 6.

The inverter power module 2 includes two inverter modules 2A that drive the motor 1A, and a relay module 2B that serves as a neutral point relay for the coils, and these three modules form a substantially U-shape surrounding the rotating shaft 6. It is located in The inverter module 2A and relay module 2B are fixed to the end surface of the motor section 1 via a holding member 2C.

The connector member 4 includes three connectors oriented in the same direction along the axial direction of the rotating shaft 6. Specifically, there is a power supply connector 4a located in the center, a sensor input connector 4b into which signals are input from sensors arranged on the steering mechanism side (for example, a steering angle sensor, a torque sensor, etc.), and other connectors inside the vehicle. A communication connector 4c for communicating (for example, CAN communication) with a control device is provided. These connectors 4a, 4b, 4c protrude to the outside through an opening 8 of the motor cover 5.

In the electric actuator device of this embodiment, the inverter power module 2, the circuit board 3, the connector member 4, and the motor cover 5 constitute a "control device" in the claims. This control device and the motor section 1 are integrated, thereby reducing the size of the entire device.

FIG. 3 is a perspective view schematically showing the circuit board 3 in a state of being bent into a substantially U-shape, and FIG. 4 is a side view. As described above, as shown in FIGS. 3 and 4, the circuit board 3 is folded into a substantially U-shape and incorporated into the electric actuator device.

That is, the circuit board 3 is relatively connected to the first rigid part 11 which is a power system board on which a group of electronic components through which a relatively large current flows for driving the motor 1A via the inverter power module 2. It includes a second rigid section 12 serving as a control system board on which control system electronic components through which a small current flows are mounted, and a flexible section 13 between the two. The first rigid section 11 corresponds to a "first component mounting section," and the second rigid section 12 corresponds to a "second component mounting section." Then, the circuit board 3 is assembled with the case with the flexible portion 13 being flexibly deformed so that the first rigid portion 11 and the second rigid portion 12 overlap each other in the axial direction of the rotating shaft 6. The motor cover 5 is housed between a housing 7 and a motor cover 5. In a specific embodiment, the first rigid section 11 and the second rigid section 12 in the bent state are separated by a distance that ensures that the electronic components mounted on each do not come into contact with each other, and each is in a planar state. They are fixedly supported by the electric actuator device in a state where they are parallel to each other while maintaining the same.

FIG. 5 is a cross-sectional view showing the circuit board 3 in an unfolded state, that is, in a state before being bent (hatching of the board portion is omitted). The circuit board 3 made of one multilayer wiring board includes a first surface 3A and a second surface 3B. FIG. 6 is a plan view showing the configuration of the first surface 3A when the circuit board 3 is unfolded, and FIG. 7 is a plan view showing the configuration of the second surface 3B. When the circuit board 3 is unfolded as shown in FIGS. 5 to 7, the first rigid section 11, the second rigid section 12, and the flexible section 13 form a single circuit board along one plane. After the components are mounted, it is finally bent into a substantially U-shape.

The first rigid section 11 and the second rigid section 12 each have a shape similar to a quadrilateral with mounting holes 15 at four corners. The center portion of one side of the first rigid portion 11 and the center portion of one side of the second rigid portion 12 which are adjacent to each other are connected to each other by a flexible portion 13 having a band shape of a constant width. That is, the width of the flexible portion 13 is narrower than the width of the first rigid portion 11 and the second rigid portion 12 (the dimension in the direction orthogonal to the bending direction). Therefore, the circuit board 3 has an I-shape to a character-8 shape as a whole. By configuring the widths of the first and second rigid sections 11 and 12 to be relatively wide and the width of the flexible section 13 to be relatively narrow, a large component mounting area can be secured, while the flexible section 13 flexural deformation becomes easy.

The circuit board 3 is composed of a multilayer printed wiring board, specifically a so-called six-layer printed wiring board including six metal foil layers. This multilayer printed wiring board is made by laminating several layers of base material, such as glass epoxy, with metal foil layers on one or both sides via prepreg (adhesive layer), and then integrating them by heating and pressing. It is made up of. Therefore, the surface metal foil layer of each of the first surface 3A and the second surface 3B and the four inner metal foil layers constitute six metal foil layers serving as wiring layers. A base material serving as an insulating layer is interposed between the metal foil layers to insulate the metal foil layers. In the first rigid section 11 and the second rigid section 12, a desired circuit pattern is formed by etching these six metal foil layers and forming vias extending in the stacking direction.

As is clear from FIG. 4, the flexible part 13 is formed to be relatively thin compared to the thickness (dimension in the stacking direction) of the substrates of the first rigid part 11 and the second rigid part 12 having a six-layer structure. As a result, it is configured to have higher flexibility than the first rigid section 11 and the second rigid section 12. In one embodiment, after forming a circuit board 3 having a six-layer structure in a rectangular shape, for example, including a first rigid part 11, a second rigid part 12, and a flexible part 13, a flexible part is formed by secondary machining. At the time of bending at step 13, the inner four layers are shaved off to make the thickness thinner. Therefore, the base material of the first and second rigid parts 11 and 12 and the base material of the flexible part 13 are made of the same material, and the two metal foil layers remaining as the flexible part 13 are The parts 11 and 12 and the flexible part 13 are continuous.

In the illustrated example, the intermediate rigid section 14 is left in the 6-layer structure in the center of the flexible section 13 in order to ensure a printing surface for barcodes, etc., and a pair of grooves are provided on both sides of the intermediate rigid section 14. A thin portion 16 is formed. This intermediate rigid portion 14 is not essential, and the entire flexible portion 13 may be made thinner. In this embodiment, the entire area between the first rigid section 11 and the second rigid section 12, including the intermediate rigid section 14, is referred to as the flexible section 13.

As is clear from FIGS. 5 and 6, the groove 16 is depressed in the shape of a groove on the first surface 3A of the circuit board 3. On the second surface 3B, the flexible portion 13 has a surface that is continuous with the first and second rigid portions 11 and 12.

A pair of grooves 16 that provide the necessary flexibility to the flexible part 13 are formed along one side of the first rigid part 11 and the second rigid part 12, thereby allowing the first and second rigid parts to A boundary 18 between the sections 11, 12 and the flexible section 13 is defined. In other words, a pair of boundaries 18 are defined by the outer edges of the thinned groove 16, and when it is bent as shown in FIG. 4, the thin flexible portion 13 is flexibly deformed between the pair of boundaries 18. The width of the circuit board 3 (the dimension in the direction perpendicular to the bending direction) decreases at the boundary 18 where the first and second rigid parts 11 and 12 transition to the flexible part 13. The flexible portion 13 is formed into a band shape with a constant width so that it can be easily bent and deformed. In addition, in order to suppress stress concentration due to a decrease in the width dimension at the boundary 18, the flexible portion is 13 is rounded into a circular arc shape with an appropriate radius (see FIGS. 5 and 6).

In the flexible part 13 (the part of the groove 16), among the six metal foil layers, the surface metal foil layer on the second surface 3B side, which becomes the outer surface when bent, and the inner layer adjacent thereto (that is, the second The metal foil layer (the second layer when viewed from the surface 3B side) remains. Note that although the intermediate rigid section 14 has six metal foil layers, the metal foil layers corresponding to the third to sixth layers when viewed from the second surface 3B are not used for forming the wiring pattern. .

FIG. 8 shows a wiring pattern formed by etching on the first metal foil layer, which is the surface layer on the second surface 3B side, and FIG. 9 shows a wiring pattern formed by etching on the second metal foil layer. Shows the wiring pattern. In each case, only the wiring pattern in the flexible part 13, which is the main part, is shown. In the flexible portion 13, only these two metal foil layers are used to form the wiring pattern. In the first and second rigid parts 11 and 12, four more metal foil layers are used to form a wiring pattern.

Next, the layout of various parts that are essential parts of the present invention will be explained. In the following description, in order to facilitate understanding, the longitudinal direction of the circuit board 3 in the unfolded state will be referred to as the L direction, as shown in FIGS. 6 and 7, and the width direction orthogonal to this will be referred to as the W direction. The pair of boundaries 18 of the flexible portion 13 described above are straight lines extending in the W direction. If a straight line along the L direction is drawn on the circuit board 3 in the unfolded state, when the circuit board 3 is bent into a substantially U shape, the straight line on the first rigid part 11 and the straight line on the second rigid part 12 will be drawn. One plane (a plane perpendicular to the boundary 18) is defined by . Furthermore, for convenience of explanation, as shown in FIGS. 6 and 7, a line that intersects the rotation center axis of the motor 1A during assembly and extends parallel to the L direction is defined as a substrate center line M.

The circuit board 3 of this embodiment includes two mutually independent control systems corresponding to the two coil systems of the motor 1A. Basically, each control system is configured by arranging components on the circuit board 3 along the L direction, which is the longitudinal direction of the circuit board 3, and the two control systems are basically arranged in the width direction of the circuit board 3. They are arranged side by side in the W direction. Except for differences in details, the two control systems are configured symmetrically with respect to the substrate centerline M.

As shown in FIG. 6, on the first surface 3A of the first rigid section 11, two filter sections 31 for noise removal are arranged near the center of the first rigid section 11 in the L direction. , two power supply capacitor sections 34 are arranged at positions on the opposite side of the flexible section 13 from the filter sections 31 . That is, one control system includes one filter section 31 and one power supply capacitor section 34. The filter section 31 includes a coil 32 having a rectangular case, and a capacitor 33 having a rectangular case and located closer to the flexible section 13 than the coil 32 . Further, the power supply capacitor section 34 includes a plurality of capacitors 34A, 34B, and 34C each having a rectangular case, for example, three. A group of electronic components constituting one control system, that is, a capacitor 33, a coil 32, and capacitors 34A, 34B, and 34C, are arranged in sequence in the L direction and generally in a line, although not in a perfect straight line. The capacitor 33, coil 32, capacitors 34A, 34B, 34C that make up one control system and the capacitor 33, coil 32, capacitors 34A, 34B, 34C that make up another control system are They are arranged symmetrically with M as the center.

Further, between the capacitor 33 of the filter section 31 and the flexible section 13, a total of four power cutoff switching elements 35, two for each control system, are mounted. The two power cutoff switching elements 35 of each control system are arranged adjacent to the capacitor 33. Further, a total of four power cutoff switching elements 35 are arranged substantially in a straight line along the W direction.

On the first surface 3A of the first rigid section 11, between the two electronic component groups of the control system, specifically between the two filter sections 31, there is a second detection element for detecting the operating state of the motor 1A. A rotation sensor 38 is mounted. This second rotation sensor 38 is an analog rotation sensor that detects the rotation of the rotation shaft 6 by being combined with a magnetic pole provided at the end of the rotation shaft 6 of the motor 1A. It is located on the axis. This second rotation sensor 38 is shared by the two control systems, and is branched into two signal circuits on the first rigid section 11 to be used by each control system.

A first power terminal 40 is attached to a pair of side edges 11a of the first rigid section 11 facing in the W direction, respectively. Each of the first power terminals 40 includes a positive terminal 40A and a negative terminal 40B, and one set of first power terminals 40 consisting of the positive terminal 40A and the negative terminal 40B corresponds to one control system, respectively. There is. These power supply terminals 40 are located outside the electronic component groups (that is, the capacitor 33, the coil 32, and the capacitors 34A, 34B, and 34C) constituting each control system in the W direction of the circuit board 3.

The positive electrode terminal 40A and the negative electrode terminal 40B are each made of a metal piece bent into a substantially L shape, and extend from the first surface 3A along the side edge of the first rigid portion 11 so as to be perpendicular to the first surface 3A. There is. The positive terminal 40A and the negative terminal 40B are arranged side by side along the L direction, and the positive terminal 40A is located closer to the flexible portion 13 than the negative terminal 40B. Specifically, the positive terminal 40A is located on the side of the capacitor 33 of the filter section 31, and the negative terminal 40B is located on the side of the coil 32. When the electric actuator device is finally assembled, the first power terminal 40 is connected to the terminal piece of the power connector 4a of the connector member 4 described above. Note that the two sets of first power supply terminals 40 are configured symmetrically with respect to the substrate center line M.

The first rigid section 11 further includes a gate signal port 41 connected to the switching element of each arm of the inverter power module 2, and an inverter power port 42 for supplying power supply voltage to the inverter power module 2. We are prepared. All of these are formed as through-hole terminals. The gate signal port 41 is arranged near the first power supply terminal 40, and the inverter power supply port 42 is arranged on the side of the power supply capacitor section 34 (outside in the W direction). When the electric actuator device is finally assembled, pin-shaped terminal pieces of the inverter power module 2 are inserted into these ports 41 and 42 and electrically connected.

On the first surface 3A of the second rigid section 12, two CPUs 21 respectively corresponding to the two control systems are mounted near the center of the second rigid section 12 in the L direction. The CPU 21 is composed of an integrated circuit having a flat, approximately square package. The two CPUs 21 are arranged symmetrically with respect to the substrate center line M. Pre-driver circuit elements 22 are mounted at positions closer to the flexible section 13 than the two CPUs 21, respectively. The pre-driver circuit element is an integrated circuit having a substantially square flat package smaller than the CPU 21. The two pre-driver circuit elements 22 correspond to the two control systems, respectively, and are arranged symmetrically about the board centerline M. Each pre-driver circuit element 22 is arranged in line with the CPU 21 of the corresponding control system along the L direction.

A pair of side edges 12a of the second rigid section 12 facing in the W direction are each formed with a notch 24 to avoid interference with the first power terminal 40 of the first rigid section 11 in the bent state. ing. These notches 24 are generally located on the sides of the CPU 21 and the pre-driver circuit element 22. Further, a second power terminal 25 consisting of two positive and negative through holes is provided at a position along each notch 24 . These two sets of second power supply terminals 25 correspond to respective control systems. When the electric actuator device is finally assembled, the pin-shaped terminal piece of the power connector 4a of the connector member 4 described above is inserted into the through-hole-shaped second power terminal 25 and electrically connected. .

An external sensor input section 27 consisting of a plurality of through-hole terminals is provided in an end region of the second rigid section 12 closer to the flexible section 13 . The plurality of through-hole terminals are arranged in a straight line along the W direction. When the electric actuator device is finally assembled, the pin-shaped terminal piece of the sensor input connector 4b of the connector member 4 is inserted into the external sensor input section 27, and the signal from an external sensor such as a steering angle sensor or a torque sensor is input. is input to each control system via the external sensor input section 27.

Further, in an end region of the second rigid section 12 opposite to the flexible section 13, a communication port 28 consisting of a plurality of through-hole terminals is provided. The plurality of through-hole terminals are arranged in a straight line along the W direction. When the electric actuator device is finally assembled, the pin-shaped terminal piece of the communication connector 4c of the connector member 4 is inserted into the communication port 28, and communication is performed with other external control devices. .

As shown in FIG. 7, on the second surface 3B of the first rigid section 11, a first rotation sensor 37 is mounted in the center as a detection element for detecting the operating state of the motor 1A. This first rotation sensor 37 is a digital rotation sensor that detects the rotation of the rotation shaft 6 by being combined with a magnetic pole provided at the end of the rotation shaft 6 of the motor 1A. It is located on the axis. Like the second rotation sensor 38, this first rotation sensor 37 is shared by two control systems, and is branched into two signal circuits on the first rigid section 11 to be used by each control system. be done.

The first rotation sensor 37 disposed on the second surface 3B and the second rotation sensor 38 disposed on the first surface 3A are located at positions overlapping each other when the circuit board 3 is viewed in projection. When finally assembled as an electric actuator device, the first rotation sensor 37 is located on the outer surface of the approximately U-shaped circuit board 3 and faces the end surface of the rotating shaft 6. The second rotation sensor 38 is located inside the substantially U-shaped circuit board 3. In one embodiment, the first rotation sensor 37 is the main rotation sensor, and the second rotation sensor 38 is a backup rotation sensor used, for example, when the first rotation sensor 37 is abnormal.

Note that one of the rotation sensors disposed on the first surface 3A and the second surface 3B may be used for one control system, and the other may be used for the other control system, and they may be used independently of each other.

On the second surface 3B of the second rigid section 12, two power supply/communication ICs 29 are mounted, each of which is an integrated circuit including a power supply circuit for the second rigid section 12 and a communication circuit for the communication port 28. The power supply/communication IC 29 has a flat, approximately square package smaller than the CPU 21 . The two power supply/communication ICs 29 correspond to the two control systems, respectively, and are arranged at substantially symmetrical positions with respect to the board centerline M. Regarding the L direction, the power supply/communication IC 29 is arranged in the end region of the second rigid section 12 opposite to the flexible section 13, and is located between the second power terminal 25 and the communication port 28. Located in When the second rigid section 12 is viewed in projection, the power/communication IC 29 is located between the CPU 21 and the communication port 28, and the CPU 21 is located closer to the flexible section 13 than the power/communication IC 29. Therefore, the CPU 21 is located intermediate between the power supply/communication IC 29 and the external sensor input section 27.

The power supply/communication IC 29 corresponds to a "communication processing circuit section" that communicates with other external control devices via the communication port 28. Further, the power supply/communication IC 29 corresponds to a "second component mounting section power supply circuit section" that converts the terminal voltage input to the second power supply terminal 25 into an operating voltage for the second rigid section 12. Note that, in the present invention, the power supply circuit and the communication circuit may each be constituted by separate integrated circuits.

The arrangement of the main electronic components has been described above, but in addition to the above-mentioned electronic components, there are many relatively small electronic components on the surface of the first rigid section 11 and the second rigid section 12. Implemented.

The detection signals of the first rotation sensor 37 and the second rotation sensor 38 arranged in the first rigid part 11 are sent to the second rigid part 12 side including the CPU 21 via a detection signal line provided in the flexible part 13. Sent. As described above, FIG. 8 shows a wiring pattern formed by etching on the first metal foil layer that is the surface layer on the second surface 3B side. A plurality of detection signal lines 51 for the first and second rotation sensors 37 and 38 are wired at the center of the layer in the W direction. These detection signal lines 51 extend linearly in the L direction in the flexible portion 13, and a plurality of detection signal lines 51 are provided in parallel to each other. Note that the detection signal of the second rotation sensor 38 located on the first surface 3A side is branched into two systems on the first surface 3A side, and then sent to the second surface 3B side via a through hole (via). It is connected to the detection signal line 51 at the top.

In addition to the detection signal line 51 described above, the first metal foil layer that is the surface layer on the second surface 3B side of the flexible part 13 connects the first rigid part 11 and the second rigid part 12. A plurality of control signal lines 52 are formed in line with the detection signal line 51. These control signal lines 52 are located outside (on both sides) of the detection signal line 51 in the W direction. These control signal lines 52 also extend linearly in the L direction in the flexible portion 13, and a plurality of control signal lines 52 are provided in parallel to each other. A plurality of control signal lines 52 located on one side in the W direction with the detection signal line 51 as the center are control signal lines 52 for one control system, and a plurality of control signal lines located on the other side in the W direction are the control signal lines 52 for one control system. 52 is a control signal line 52 for the other control system.

As shown in FIG. 9, a ground line 54 is formed in the second metal foil layer serving as the inner layer of the flexible portion 13. As shown in FIG. This ground line 54 is formed into a band shape that is wider than the detection signal line 51 and the control signal line 52. In one preferred embodiment, the flexible portion 13 is formed into one continuous band having a width that spans almost the entire width (dimension in the W direction). This ground line 54 is electrically connected to a location such as the housing 7 that has a ground potential via a path not shown in detail.

FIG. 10 shows the circuit configuration of an inverter circuit that drives the motor 1A. As shown in the figure, the stator 1B of the motor 1A includes three-phase coils 61 of U, V, and W, each of which is provided with a neutral point relay 62. Neutral point relay 62 is configured by relay module 2B described above. The inverter module 2A includes a total of six switching elements 63, each of which constitutes an upper arm and a lower arm of three phases U, V, and W, thereby constructing an inverter circuit. As shown in the figure, the DC power supply section of the inverter circuit includes a power supply capacitor section 34 and a filter section 31 (coil 32 and capacitor 33), and furthermore, two power cutoff switching elements 35 are connected in series on the positive electrode side. It is located. Note that FIG. 10 shows only one system, and as described above, this embodiment includes two systems of coils 61 and inverter circuits. In this embodiment, the two systems of coils 61 correspond to the "drive section" in the claims, and the two systems of inverter circuits correspond to the "drive circuit" in the claims.

As described above, in the circuit board 3 of one embodiment, two control systems corresponding to the two coils of the motor 1A are configured independently from each other, and these two control systems are connected to the first, first, and second control systems. The second rotation sensors 37 and 38 are arranged substantially symmetrically about the substrate center line M that crosses the second rotation sensors 37 and 38. To explain one control system, the detection signals of the first and second rotation sensors 37 and 38 in response to the rotation of the motor 1A are transmitted from the first rigid section 11 to the second rigid section via the detection signal line 51 in the flexible section 13. It is sent to section 12. The CPU 21 of the second rigid section 12 performs arithmetic processing using this detection signal as one parameter, and generates an instruction signal for the motor 1A. This instruction signal is amplified by the predriver circuit element 22 and converted into an operating signal for the inverter circuit. This activation signal is sent from the second rigid section 12 to the first rigid section 11 via the control signal line 52 in the flexible section 13, and finally from the gate signal port 41 of the first rigid section 11 to the inverter/power module 2. output as a gate signal to A power supply voltage is applied to the inverter power module 2 from the first power supply terminal 40 of the first rigid section 11 via the power cutoff switching element 35, the filter section 31, the power supply capacitor section 34, and the inverter power supply port 42. The motor 1A is driven by the inverter action based on the gate signal.

Here, the electronic component group (capacitor 33, coil 32, and capacitors 34A, 34B, 34C) of the first rigid section 11 constituting one control system and the CPU 21 of the second rigid section 12 connect the detection signal line in the flexible section 13. Since they are arranged along the 51 wiring direction (that is, the L direction), interference between electronic components on the layout and complication of wiring patterns between components (for example, the generation of many detour circuits) can be suppressed. Each control system can be efficiently arranged within the circuit board 3 which has a large area and is divided by the flexible portions 13. In particular, in the above embodiment, since the two control systems are arranged symmetrically across the board center line M, the two control systems are arranged along the wiring direction of the detection signal line 51. Control systems can be efficiently arranged. Furthermore, since each control system is configured to be elongated along the wiring direction of the detection signal line 51 (that is, the L direction), the wiring route within the control system as a whole tends to be straight along the L direction, and the wiring Increase in wiring distance due to route complexity is reduced. Accordingly, this is advantageous in terms of noise resistance.

Further, the rotation sensors 37 and 38 are arranged to be sandwiched between rows of electronic component groups (capacitor 33, coil 32, and capacitors 34A, 34B, 34C) of two control systems in the first rigid section 11, and Since the detection signal lines extend from the sensors 37 and 38 toward the flexible portion 13 along the substrate center line M, the number of intersections between the respective signal lines is reduced.

In the flexible part 13, the detection signal line 51 and the control signal line 52 are arranged side by side on the metal foil layer serving as the surface layer and extend parallel to each other, so that a large number of wiring lines can be arranged in the flexible part 13 having a limited width. can be wired in a simplified form. In other words, high-density wiring is possible. Then, it becomes possible to provide a relatively wide ground line 54 in the second metal foil layer, which is the inner layer. As a result, the thickness of the flexible portion 13 (thickness at the groove 16) can be reduced, and sufficient flexibility can be provided.

The presence of the wide ground line 54 in the flexible portion 13 improves the bending strength of the flexible portion 13. Preferably, the width of the ground line 54 is set larger than the sum of the widths of a plurality of signal lines on the surface layer including the detection signal line 51 and the control signal line 52. Thereby, the ground wire 54 functions as a kind of reinforcing member, and sufficiently high bending strength can be obtained.

In the first rigid part 11, rotation sensors 38 and 37 are mounted on both the first surface 3A and the second surface 3B. Since the structure is configured so that the detection signal from the first rotation sensor 37 is connected to the detection signal line 51 of the flexible part 13, all the detection signal lines 51 can be wired to one metal foil layer in the flexible part 13. can. Therefore, the wiring density in the flexible section 13 can be increased, and the input sections in the second rigid section 12 can be arranged in a concentrated manner.

Furthermore, since the detection signals of the rotation sensors 37 and 38 shared by the two control systems are divided into two systems in the first rigid section 11 and then connected to the detection signal line 51 of the flexible section 13, The resistance to disconnection of the detection signal line 51 of the flexible portion 13 is increased.

Similarly, in the flexible portion 13, the detection signal line 51 is located at the center in the W direction, and the control signal lines 52 of each control system are located on both sides thereof. The thin flexible portion 13 is generally prone to cracks starting from its side edges. For example, cracks are likely to occur along the boundary 18 between the rigid parts 11 and 12. When such a crack occurs, the detection signal line 51 located at the center in the W direction is relatively difficult to break. Even if one of the control signal lines 52 located on both sides in the W direction is disconnected, it is possible to continue driving the motor 1A using the other control system.

In the second rigid section 12, an external sensor input section 27 is provided on one side of the CPU 21, and a communication port 28 and a power supply/communication IC 29 are provided on the other side, arranged along the L direction. The external sensor input section 27 is located on the side of the flexible section 13 that includes the detection signal lines 51 from the rotation sensors 37 and 38. Therefore, the detection signals from the rotation sensors 37 and 38 and the detection signals from the external sensors can be collectively input to the CPU 21, thereby suppressing the complexity of signal wiring. In addition, since the signal lines from the CPU 21 to the power supply/communication IC 29 and the communication port 28 are wired on the opposite side of these signal wires, there is no possibility of crossing with detection signal lines from the rotation sensors 37, 38 or external sensors. This makes it possible to suppress an increase in wiring distance and an increase in the size of the circuit board.

Further, in the configuration of the above embodiment, the first power terminal 40 of the first rigid section 11 and the second power terminal 25 of the second rigid section 12 are arranged adjacent to each other when the first rigid section 11 is bent into a substantially U-shape. Therefore, the power supply connector 4a of the connector member 4 can be configured to be compact, and an increase in the installation area of the connector can be suppressed. In the second rigid section 12, the power supply voltage is input from the second power supply terminal 25 to the power supply/communication IC 29, transformed to a predetermined operating voltage, and then supplied to various electronic components on the second rigid section 12 including the CPU 21. be done. Here, the second power supply terminal 25 is arranged along the notch 24 of the second rigid part 12, and the power/communication IC 29 is arranged in the end region on the opposite side from the flexible part 13, so that The input wiring from the second power supply terminal 25 to the power supply/communication IC 29 can be arranged near the outer edge of the second rigid section 12, while power is supplied from the power supply/communication IC 29 to an area near the inner side of the second rigid section 12. It is possible to secure a wiring route on the output side for this purpose.

Note that the power supply voltage supplied from the power supply connector 4a to the first power supply terminal 40 and the power supply voltage supplied to the second power supply terminal 25 may be equal to each other, or may be different voltages from each other. Good too.

The many electronic components described above are soldered to the circuit board 3 by a so-called reflow soldering method. Here, the CPU 21, capacitor 33, coil 32, and capacitors 34A, 34B, and 34C, which are relatively heavy large components, are mounted on the same surface of the circuit board 3, that is, the first surface 3A. Therefore, by performing reflow soldering with the first surface 3A facing upward in the direction of gravity, efficient soldering work can be performed while suppressing the falling off of these large components. In other words, temporary fixing of these large components with adhesive can be omitted or reduced, and the occurrence of defects during soldering is reduced.

On the other hand, the power/communication IC 29 is mounted on a different surface of the second rigid section 12 from the CPU 21, that is, on the second surface 3B. This is done in consideration of the fact that the power supply/communication IC 29 is generally lighter than the capacitor 33 and the like, and also has a relatively large component area due to its flat package. By arranging the power supply/communication IC 29 and the CPU 21, which each occupy a large area, on different surfaces, the mounting efficiency of the second rigid section 12 is increased. Note that during reflow soldering, the power supply/communication IC 29 is temporarily fixed with adhesive and then soldered.

In the first rigid section 11, the first power terminal 40 is arranged on the side of the filter section 31, and its positive terminal 40A is located closer to the flexible section 13 than the negative terminal 40B. Therefore, the power path on the positive side from the positive electrode terminal 40A to the filter section 31 via the power cutoff switching element 35 is shortened. Since the power supply path on the positive side is wired along the L direction from the filter section 31 to the inverter power supply port 42 via the power supply capacitor section 34, the path is similarly shortened.

The instruction signal generated by the CPU 21 of the second rigid section 12 is relatively weak and susceptible to noise. In the embodiment described above, the instruction signal thus generated by the CPU 21 is amplified by the pre-driver circuit element 22 and then supplied to the first rigid section 11 via the detection signal line 51 of the flexible section 13. The length of the wiring path between the CPU 21 and the pre-driver circuit element 22 can be configured to be shorter than the length of the detection signal line 51 passing through the flexible section 13. In other words, the path length through which a weak signal flows can be made shorter than the path length through which an amplified signal flows, which is advantageous in terms of noise resistance.

Although one embodiment of the present invention has been described above in detail, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, the flexible portion 13 has a band-like configuration with a constant width, but the present invention is applicable even when the flexible portion does not have such a simple shape. Further, in the above embodiment, the flexible section 13 is constructed by removing four layers of the six-layer circuit board, but the present invention is not limited to such a construction. Further, it is not essential that the width of the flexible portion 13 in the W direction is smaller than the width of the rigid portions 11 and 12 in the W direction.

Furthermore, the present invention is not limited to the circuit board of the electric actuator for a power steering device described above, but can be applied to electronic circuit devices for various uses.

Note that some electronic components other than those described above may be mounted on the intermediate rigid section 14 that exists between the first rigid section 11 and the second rigid section 12, and the present invention excludes such a configuration. It's not something you do.

As in the above embodiment, in the structure in which the flexible part 13 having flexibility is formed by thinning a part of a single multilayer wiring board which is originally rigid, the rigid parts 11 and 12 which are rigid are The positional relationship between the flexible part 13 and the flexible part 13 becomes fixed, and the formation of the flexible part 13 reduces the proportion of the area where electronic components can be mounted, which tends to make component layout and wiring layout difficult. . In the above embodiment, as described above, it is possible to improve the efficiency of component layout and wiring layout, and it is possible to solve the problem that occurs when a part of one multilayer wiring board is made thinner.

As described above, the present invention
In electronic control devices that drive and control electric actuators,
A multilayer wiring board having a plurality of wiring layers and an insulating layer that insulates between these wiring layers,
The above multilayer wiring board is
first and second component mounting sections on which electronic components are mounted;
It is located between the first and second component mounting sections, has fewer wiring layers than these component mounting sections, and has a relatively thinner substrate than the first and second component mounting sections. a flexible part with high flexibility;
a detection element that is mounted on the first component mounting section and detects the operating state of the electric actuator;
a detection signal line formed in the wiring layer of the flexible section and transmitting the signal of the detection element from the first component mounting section to the second component mounting section;
Equipped with
A group of electronic components mounted on the first component mounting section and a CPU mounted on the second component mounting section constituting one control system of the electric actuator are arranged along the wiring direction of the detection signal line. ing.

In one preferred embodiment,
The multilayer wiring board has a first surface and a second surface,
The flexible portion is recessed in a groove shape on the first surface, and has a surface continuous with the first and second component mounting portions on the second surface,
The detection element is arranged on the second surface of the first component mounting section,
The detection signal line is formed in a surface wiring layer on the second surface side of the flexible part, and a ground line is formed in an inner wiring layer.

In another preferred embodiment,
The multilayer wiring board has a first surface and a second surface,
The flexible portion is recessed in a groove shape on the first surface, and has a surface continuous with the first and second component mounting portions on the second surface,
The detection element is arranged on the second surface of the first component mounting section,
The detection signal line is formed in a surface wiring layer on the second surface side of the flexible part, and the same wiring layer is connected between the first component mounting part and the second component mounting part. A control signal line is formed parallel to the detection signal line.

In another preferred embodiment,
The multilayer wiring board has a first surface and a second surface,
The flexible portion is recessed in a groove shape on the first surface, and has a surface continuous with the first and second component mounting portions on the second surface,
The detection element includes a first detection element and a second detection element, wherein the first detection element is arranged on the second surface of the first component mounting section, and the second detection element is arranged on the second surface of the first component mounting section. It is arranged on the first surface of the component mounting section,
The detection signal line is formed in a surface wiring layer on the second surface side of the flexible part,
The first detection element and the second detection element are connected to the detection signal line at the first component mounting section.

The flexible part has two layers as the wiring layer, a surface wiring layer and an inner wiring layer,
A plurality of signal lines including the detection signal line are formed in the surface wiring layer,
A ground line having a width larger than the sum of the widths of the plurality of signal lines is formed in the inner wiring layer.

In another preferred embodiment,
The second component mounting section is
the CPU that processes the detection signal of the detection element as one parameter and generates an instruction signal for the electric actuator;
an external sensor input section into which a signal from a sensor located outside the electronic control device is input;
a communication processing circuit unit that communicates with other electronic control devices;
Equipped with
In the second component mounting section, the external sensor input section is located on the flexible section side, the communication processing circuit section is located on the opposite side from the flexible section, and the CPU is located on the side opposite to the flexible section. It is located at an intermediate portion between the communication processing circuit section and the communication processing circuit section.

In another preferred embodiment,
The first component mounting section includes a first power terminal, and the first power terminal is located at a side edge of the first component mounting section and is located outside of the electronic component group constituting the control system. Position to,
The second component mounting section includes a second power terminal on a side edge of the second component mounting section, and transforms the terminal voltage input to the second power terminal into an operating voltage for the second component mounting section. A power supply circuit section for a second component mounting section is disposed in an end region opposite to the flexible section.

Preferably, a notch is formed in a side edge of the second component mounting section at a position facing the first power terminal when the multilayer wiring board is bent, and a notch is formed at a position along the notch. The second power supply terminal is arranged at.

In another preferred embodiment,
The second component mounting section includes a second power terminal that supplies power to the second component mounting section, and the second power terminal is located at a side edge of the second component mounting section,
The CPU is mounted on the first surface of the second component mounting section,
A second component mounting section power supply circuit section that transforms the terminal voltage input to the second power supply terminal into an operating voltage for the second component mounting section is located on the opposite side of the second component mounting section from the flexible section. and is mounted on the second surface of the second component mounting section.

In another preferred embodiment,
The first component mounting section includes a first power terminal including a positive electrode and a negative electrode,
The first power supply terminal is located at a side edge of the first component mounting section, and is located outside the electronic component group constituting the control system,
The positive electrode and the negative electrode are arranged side by side along the direction of the detection signal line, and the positive electrode is located closer to the flexible portion with respect to the negative electrode,
A switching element capable of cutting off power supplied from the first power supply terminal to the electronic component group is arranged between the electronic component group and the flexible section.

In another preferred embodiment,
The second component mounting section is
the CPU that processes the detection signal of the detection element as one parameter and generates an instruction signal for the electric actuator;
a pre-driver circuit element that converts the instruction signal into a control signal for a drive circuit that drives the electric actuator;
Equipped with
The CPU, the pre-driver circuit element, and the filter component and sub-power capacitor included in the electronic component group in the first component mounting section are mounted on the same surface of the multilayer wiring board.

Furthermore, the present invention
In an electronic control device that drives and controls an electric actuator having two drive parts,
The multilayer wiring board includes one multilayer wiring board having a plurality of wiring layers and an insulating layer that insulates between the wiring layers,
first and second component mounting sections on which electronic components are mounted;
It is located between the first and second component mounting sections, has fewer wiring layers than these component mounting sections, and has a relatively thinner substrate than the first and second component mounting sections. a flexible part with high flexibility;
a detection element that is mounted on the first component mounting section and detects the operating state of the electric actuator;
a detection signal line formed in the wiring layer of the flexible section and transmitting the signal of the detection element from the first component mounting section to the second component mounting section;
Equipped with
Two control systems respectively corresponding to the two drive parts of the electric actuator are each configured by a group of electronic components mounted on the first component mounting section and a CPU mounted on the second component mounting section,
The detection element is arranged in the first component mounting section so as to be sandwiched between two rows of electronic component groups respectively corresponding to the two control systems.

In one preferred embodiment,
The second component mounting section includes, for each of the two control systems,
the CPU that processes the detection signal of the detection element as one parameter and generates an instruction signal for the electric actuator;
a pre-driver circuit element that converts the instruction signal into an actuation signal for a drive circuit that drives the electric actuator;
Equipped with
The CPU of each control system, the pre-driver circuit element, and the electronic component group in the first component mounting section are arranged along the direction of an imaginary line passing through the center of the flexible section and the detection element. ,
An output signal from the pre-driver circuit element is transmitted to the first component mounting section via the wiring in the flexible section.

In another preferred embodiment,
The detection signal line is formed in one wiring layer of the flexible section, and control signals are supplied from the second component mounting section to the first component mounting section for each control system on the same wiring layer. A control signal line is formed,
The control signal lines of the two control systems are arranged on both sides of the detection signal line, respectively.

In another preferred embodiment,
The multilayer wiring board has a first surface and a second surface,
In the first component mounting section, the detection element is mounted on the second surface, and the electronic component group constituting each control system is mounted on the first surface,
When the first component mounting section is viewed in projection, the detection element is sandwiched between one electronic component in one control system and one electronic component having the same function in another control system. It is located at a position that does not overlap with these two electronic components.

In another preferred embodiment,
The above detection element is shared by two control systems,
The detection signal of the detection element is branched into two systems in the first component mounting section, and then input to each control system via the detection signal line in the flexible section.

DESCRIPTION OF SYMBOLS 1... Motor part, 2... Inverter power module, 3... Circuit board, 3A... First surface, 3B... Second surface, 4... Connector member, 5... Motor cover, 7... Housing, 11... First rigid part, DESCRIPTION OF SYMBOLS 12... 2nd rigid part, 13... flexible part, 16... groove, 21... CPU, 22... pre-driver circuit element, 24... notch part, 25... 2nd power supply terminal, 27... external sensor input part, 28... communication port, 29...power supply/communication IC, 31...filter section, 32...coil, 33...capacitor, 34...power supply capacitor section, 35...switching element for power cutoff, 37...first rotation sensor, 38...second rotation sensor , 40...First power supply terminal, 40A...Positive terminal, 40B...Negative terminal, 41...Gate signal port, 42...Inverter power supply port, 51...Detection signal line, 52...Control signal line, 54...Ground line.

Claims (16)

In an electronic control device that drives and controls an electric actuator having two drive parts,
A multilayer wiring board having a plurality of wiring layers and an insulating layer that insulates between these wiring layers,
The above multilayer wiring board is
first and second component mounting sections on which electronic components are mounted;
It is located between the first and second component mounting sections, has fewer wiring layers than these component mounting sections, and has a relatively thinner substrate than the first and second component mounting sections. a flexible part with high flexibility;
a detection element that is mounted on the first component mounting section and detects the operating state of the electric actuator;
a detection signal line formed in the wiring layer of the flexible section and transmitting the signal of the detection element from the first component mounting section to the second component mounting section;
Equipped with
The detection element is shared by two control systems corresponding to each drive section of the electric actuator,
The detection signal of the detection element is branched into two systems in the first component mounting section, and these two detection signals are sent to the second component mounting section via the detection signal line in the flexible section. configured to be input to a control system,
A group of electronic components mounted on the first component mounting section and a CPU mounted on the second component mounting section, respectively constituting two control systems of the electric actuator, are arranged along the wiring direction of the detection signal line. has been,
An electronic control device characterized by: The multilayer wiring board has a first surface and a second surface,
The flexible portion is recessed in a groove shape on the first surface, and has a surface continuous with the first and second component mounting portions on the second surface,
The detection element is arranged on the second surface of the first component mounting section,
The detection signal line is formed in a surface wiring layer on the second surface side of the flexible part, and a ground line is formed in an inner wiring layer.
The electronic control device according to claim 1, characterized in that: The multilayer wiring board has a first surface and a second surface,
The flexible portion is recessed in a groove shape on the first surface, and has a surface continuous with the first and second component mounting portions on the second surface,
The detection element is arranged on the second surface of the first component mounting section,
The detection signal line is formed in a surface wiring layer on the second surface side of the flexible part, and the same wiring layer is connected between the first component mounting part and the second component mounting part. A control signal line is formed in parallel with the detection signal line.
The electronic control device according to claim 1, characterized in that: The multilayer wiring board has a first surface and a second surface,
The flexible portion is recessed in a groove shape on the first surface, and has a surface continuous with the first and second component mounting portions on the second surface,
The detection element includes a first detection element and a second detection element, wherein the first detection element is arranged on the second surface of the first component mounting section, and the second detection element is arranged on the second surface of the first component mounting section. It is arranged on the first surface of the component mounting section,
The detection signal line is formed in a surface wiring layer on the second surface side of the flexible part,
The first detection element and the second detection element are connected to the detection signal line in the first component mounting section.
The electronic control device according to claim 1, characterized in that: The flexible part has two layers as the wiring layer, a surface wiring layer and an inner wiring layer,
A plurality of signal lines including the detection signal line are formed in the surface wiring layer,
A ground line having a width greater than the sum of the widths of the plurality of signal lines is formed in the inner wiring layer;
The electronic control device according to claim 1, characterized in that: The second component mounting section is
the CPU that processes the detection signal of the detection element as one parameter and generates an instruction signal for the electric actuator;
an external sensor input section into which a signal from a sensor located outside the electronic control device is input;
a communication processing circuit unit that communicates with other electronic control devices;
Equipped with
In the second component mounting section, the external sensor input section is located on the flexible section side, the communication processing circuit section is located on the opposite side from the flexible section, and the CPU is located on the side opposite to the flexible section. located in the middle between the communication processing circuit section,
The electronic control device according to claim 1, characterized in that: The first component mounting section includes a first power terminal, and the first power terminal is located at a side edge of the first component mounting section and is located outside of the electronic component group constituting the control system. Position to,
The second component mounting section includes a second power terminal on a side edge of the second component mounting section, and transforms the terminal voltage input to the second power terminal into an operating voltage for the second component mounting section. a power supply circuit section for a second component mounting section is arranged in an end region opposite to the flexible section;
The electronic control device according to claim 1, characterized in that: The second component mounting section includes a second power terminal that supplies power to the second component mounting section, and the second power terminal is located at a side edge of the second component mounting section,
The CPU is mounted on the first surface of the second component mounting section,
A second component mounting section power supply circuit section that transforms the terminal voltage input to the second power supply terminal into an operating voltage for the second component mounting section is located on the opposite side of the second component mounting section from the flexible section. mounted in the end region of and on the second surface of the second component mounting section,
The electronic control device according to claim 1, characterized in that: The first component mounting section includes a first power terminal including a positive electrode and a negative electrode,
The first power supply terminal is located at a side edge of the first component mounting section, and is located outside the electronic component group constituting the control system,
The positive electrode and the negative electrode are arranged side by side along the direction of the detection signal line, and the positive electrode is located closer to the flexible portion with respect to the negative electrode,
A switching element capable of cutting off power supplied from the first power supply terminal to the electronic component group is disposed between the electronic component group and the flexible section.
The electronic control device according to claim 1, characterized in that: The second component mounting section is
the CPU that processes the detection signal of the detection element as one parameter and generates an instruction signal for the electric actuator;
a pre-driver circuit element that converts the instruction signal into a control signal for a drive circuit that drives the electric actuator;
Equipped with
The CPU, the pre-driver circuit element, and the filter component and sub power supply capacitor included in the electronic component group in the first component mounting section are mounted on the same surface of the multilayer wiring board;
The electronic control device according to claim 1, characterized in that: In an electronic control device that drives and controls an electric actuator having two drive parts,
A multilayer wiring board having a plurality of wiring layers and an insulating layer that insulates between these wiring layers,
The above multilayer wiring board is
first and second component mounting sections on which electronic components are mounted;
It is located between the first and second component mounting sections, has fewer wiring layers than these component mounting sections, and has a relatively thinner substrate than the first and second component mounting sections. a flexible part with high flexibility;
a detection element that is mounted on the first component mounting section and detects the operating state of the electric actuator;
a detection signal line formed in the wiring layer of the flexible section and transmitting the signal of the detection element from the first component mounting section to the second component mounting section;
Equipped with
Two control systems respectively corresponding to the two drive parts of the electric actuator are each configured by a group of electronic components mounted on the first component mounting section and a CPU mounted on the second component mounting section,
The detection element is arranged in the first component mounting section so as to be sandwiched between two rows of electronic component groups respectively corresponding to the two control systems,
The above detection element is shared by two control systems,
The detection signal of the detection element is branched into two systems in the first component mounting section, and these two detection signals are sent to the second component mounting section via the detection signal line in the flexible section. configured to be input to the control system,
An electronic control device characterized by: The second component mounting section includes, for each of the two control systems,
the CPU that processes the detection signal of the detection element as one parameter and generates an instruction signal for the electric actuator;
a pre-driver circuit element that converts the instruction signal into an actuation signal for a drive circuit that drives the electric actuator;
Equipped with
The CPU of each control system, the pre-driver circuit element, and the electronic component group in the first component mounting section are arranged along the direction of an imaginary line passing through the center of the flexible section and the detection element. ,
The output signal of the pre-driver circuit element is transmitted to the first component mounting section side via the wiring in the flexible section.
12. The electronic control device according to claim 11. The detection signal line is formed in one wiring layer of the flexible section, and control signals are supplied from the second component mounting section to the first component mounting section for each control system on the same wiring layer. A control signal line is formed,
The control signal lines of the two control systems are arranged on both sides of the detection signal line, respectively.
12. The electronic control device according to claim 11. The multilayer wiring board has a first surface and a second surface,
In the first component mounting section, the detection element is mounted on the second surface, and the electronic component group constituting each control system is mounted on the first surface,
When the first component mounting section is viewed in projection, the detection element is sandwiched between one electronic component in one control system and one electronic component having the same function in another control system. and located in a position that does not overlap with these two electronic components,
12. The electronic control device according to claim 11. The detection signal of the detection element is branched into two systems in the first component mounting section, and then input to each control system via the detection signal line in the flexible section.
12. The electronic control device according to claim 11. A notch is formed in the side edge of the second component mounting section at a position facing the first power supply terminal when the multilayer wiring board is folded, and the first power terminal is located along the notch. 2 power terminals are arranged,
The electronic control device according to claim 7, characterized in that:

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