The present invention relates to an electronic control unit mounted on a vehicle (a vehicle-mounted electronic control unit), an electric motor formed integrally with the electronic control unit (a vehicle-mounted mechanically/electrically integrated electric motor), and the like.
A vehicle such as an automobile can include, for example, electronic power steering apparatus as a vehicle-mounted apparatus. The electric power steering apparatus generates auxiliary torque for assisting steering torque in a steering system generated through an operation by a driver on a steering handle. According to the generation of the auxiliary torque, the electric power steering apparatus can reduce a burden on the driver. An auxiliary torque mechanism, which applies the auxiliary torque, detects the steering torque of the steering system with a steering torque sensor, generates a driving signal with an electronic control unit on the basis of a signal of the detection, generates, with an electric motor, auxiliary torque corresponding to the steering torque on the basis of the driving signal, and transmits the auxiliary torque to the steering system via a speed reduction mechanism.
For example, Patent Literature 1 discloses the structure of a vehicle-mounted mechanically/electrically integrated electric motor. A first printed board (a control section) 14, a metal board (a power section) 16, and the like (an electronic control unit) shown in FIG. 2 of Patent Literature 1 are formed integrally with an electric motor 8 shown in
However, for example, on the first printed board 14 of Patent Literature 1, the microcomputer 24 needs to be disposed in a position corresponding to the heat transfer member 26. Therefore, a degree of freedom at the time when the first printed board 14 is designed decreases. According to the description of paragraph [0031] of Patent Literature 1, an ECU housing 11 shown in FIG. 2 of Patent Literature 1 has a heat radiation property. On the other hand, a lid body 12 of the ECU housing 11 shown in FIG. 2 of Patent Literature 1 does not have the heat radiation property. Therefore, it is desirable that heat radiation efficiency is improved.
For example, Patent Literature 2 discloses the structure of a vehicle-mounted mechanically/electrically integrated electric motor. A controller (an electronic control unit) such as a control section 30 and a power module (a power section) 40 shown in FIG. 7 of Patent Literature 2 is formed integrally with a motor via a motor case 11. According to the description of paragraph [0038] of Patent Literature 2, a cover 91 shown in FIG. 7 of Patent Literature 2 has a magnetic shield property.
In a heat sink 80 of Patent Literature 2, heat can be radiated not only to a side portion side of a plane section 83 and the like of the heat sink 80 but also to the cover 91 side. Therefore, the heat radiation efficiency of the heat sink 80 of Patent Literature 2 is higher than the heat radiation efficiency of the ECU housing 11 of Patent Literature 1. Note that, in order to fix the controller (the electronic control unit) such as the control section 30 and the power module (the power section) 40 shown in FIG. 7 of Patent Literature 2 to the motor, in FIG. 2, FIG. 3, and FIG. 4 of Patent Literature 2, the heat sink 80 is simply connected to the motor case 11. The heat radiation efficiency of the heat sink 80 of Patent Literature 2 depends on a heat radiation capacity of the heat sink 80 itself. The heat radiation efficiency of the heat sink 80 of Patent Literature 2 is higher than the heat radiation efficiency of the ECU housing 11 of Patent Literature 1. However, the cover 91 of Patent Literature 2 is a member different from the heat sink 80 of Patent Literature 2. The number of components or manufacturing cost increases. The cover 91 of Patent Literature 2 deteriorates the heat radiation efficiency of the heat sink 80 of Patent Literature 2.
An object of the present invention is to provide a vehicle-mounted mechanically/electrically integrated electric motor or a vehicle-mounted electronic control unit, the mechanically/electrically integrated electric motor or the vehicle-mounted electronic control unit having high heat radiation efficiency.
According to a first aspect, a vehicle-mounted electronic control unit that drives and controls an electric motor includes: a case including an ECU housing section; a lid body that covers an upper part of the ECU housing section; a power section including a switching circuit that supplies a driving signal to the electric motor and a power board on which the switching circuit is mounted; and a control section including a control circuit that controls the switching circuit. The lid body is a material having a heat radiation property higher than the heat radiation property of the power section. The ECU housing section accommodates the power section and the control section. The lower surface of the lid body is in contact with the upper surface of the power section. The upper surface of the lid body is exposed.
According to the first aspect, the lower surface of the lid body of the motor case section is closely attached to the power section including the switching circuit, which is a heat generating component. Therefore, the lid body having the heat radiation property can radiate heat not only to the motor case section side having the heat radiation property but also to the upper surface side of the lid body. Consequently, the electronic control unit can have high heat radiation efficiency.
Those skilled in the art can easily understand that the illustrated aspect according to the present invention can be further changed without departing from the spirit of the present invention.
A best embodiment described below is used to easily understand the present invention. Therefore, those skilled in the art should be aware that the present invention is not unduly limited by the best embodiment described below.
In the example shown in
With the steering system 20, by steering the steering handle 21, a driver can steer steering wheels 29, 29 with steering torque of the steering handle 21 via the rack and pinion mechanism 25.
In the example shown in
The electric power steering apparatus 10 is classified into a pinion assist type, a rack assist type, a column assist type, and the like according to a place where the auxiliary torque is applied to the steering system 20. The electric power steering apparatus 10 shown in
The electric motor 43 is, for example, a brushless motor. A rotation angle of a rotor in the brushless motor or a rotation angle of the electric motor 43 (also referred to as rotation signal) is detected by the electronic control unit 42. The rotor is configured by, for example, a permanent magnet. The electronic control unit 42 can detect a movement of the permanent magnet (the N pole and the S pole) with a magnetic sensor.
The electronic control unit 42 is configured by, for example, a power supply circuit, a current sensor that detects a motor current (an actual current), a microprocessor, an FET bridge circuit, and a magnetic sensor. Not only the torque signal but also, for example, a vehicle speed signal can be input to the electronic control unit 42 as an external signal. An external apparatus 60 is another electronic control unit capable of communicating in an interior network such as a CAN (Controller Area Network). However, the external apparatus 60 may be, for example, a vehicle speed sensor capable of outputting a vehicle speed pulse equivalent to the vehicle speed signal. The external signal includes a signal on a system side such as the torque signal and a signal on a vehicle body side (a vehicle body signal) such as the vehicle speed signal. The vehicle body signal can include not only the vehicle speed signal and a communication signal of engine speed and the like but also an ON/OFF signal of an ignition switch. A microprocessor of the electronic control unit 42 can perform vector control of the electric motor 43 on the basis of, for example, the torque signal and the vehicle speed signal. An FET bridge circuit controlled by the microprocessor is configured by, for example, switching circuits that energize the electric motor 43 (the brushless motor) with a driving current (a three-phase AC current), specifically, for example, an FET 1, an FET 2, an FET 3, an FET 4, an FET 5, and an FET 6 shown in
Such an electronic control unit 42 sets a target current on the basis of at least steering torque (a torque signal). The electronic control unit 42 preferably sets the target current also taking into account vehicle speed (a vehicle speed signal and a vehicle speed pulse) detected by the vehicle speed sensor and a rotation angle (a rotation signal) of the rotor detected by the magnetic sensor. The electronic control unit 42 can control a driving current (a driving signal) of the electric motor 43 such that a motor current (an actual current) detected by the current sensor coincides with the target current.
B+ indicates, for example, the potential of a positive electrode of a battery 61 provided in the vehicle as a DC power supply. B− indicates the potential of a negative electrode of the battery 61. The potential B− of the negative electrode can be grounded on the vehicle body of the vehicle. Note that the electronic control unit 42 includes input terminals B+ and B− (a first input terminal and a battery terminal), for example, in a connector section (e.g., a connector section in the front of
With the electric power steering apparatus 10 shown in
The case 430 includes the ECU housing section 420 and the motor case section 447. The ECU housing section 420 and the motor case section 447 may be separately provided or may be integrally provided. However, if the ECU housing section 420 and the motor case section 447 are separate, problems described below occur.
Note that
When the control section 300 is disposed in the ECU housing 420 shown in
A vehicle-mounted electronic control unit of the present invention includes the case 430 including the ECU housing section 420, the lid body 431 that covers the upper part of the ECU housing section 420, the power section 100 including the switching circuits that supply driving signals to the electric motor 43 and the power board 101 on which the switching circuits are mounted, and the control section 300 including the control circuit that controls the switching circuits. The lid body 431 is a material having a heat radiation property higher than the heat radiation property of the power board 101. The ECU housing section 420 accommodates the power section 100 and the control section 300. The lower surface of the lid body 431 is in contact with the upper surface of the power section 300. The upper surface of the lid body 431 is exposed.
The lower surface of the lid body 431 of the case 430 is closely attached to the power section 100 including the switching circuits, which are the heat generating components. Therefore, the lid body 431 made of the material having the heat radiation property higher than the heat radiation property of the power board 101 can radiate heat not only to the case 430 side having the heat radiation property but also to the upper surface side of the lid body 431. However, the power board 101 indicates a bare board excluding copper foil and the like. Consequently, the mechanically/electrically integrated power motor or the electronic control unit 42 can have high heat radiation efficiency. In particular, the lid body 431 made of the material having the high heat radiation property is in direct contact with the case 430 having the heat radiation property. An area of the contact of the lid body 431 having the heat radiation property with the case 430 (a wall section 430w) having the heat radiation property is preferably large. In other words, when the lid body 431 is simply fixed to the case 430 (the wall section 430w), the lid body 431 and the case 430 (the wall section 430w) may be in contact with each other only in several places. Therefore, when the area of the contact of the lid body 431 with the case 430 (the wall section 430w) is the maximum, heat moving from the lid body 431 to the case 430 is maximized. In addition, when each of the case 430 and the lid body 431 has the heat radiation property or is the heat sink, it is possible to suppress an increase in the number of components or manufacturing cost. The lid body 431 not only simply functions as the heat sink but also moves the heat to the case 430 via the area of the contact of the lid body 431 with the case 430 (the wall section 430w). Therefore, it is unnecessary to increase the capacity of the lid body 431 more than necessary. Therefore, the lid body 431 is small and light.
The O-ring 501 may close a gap between the groove 431d of the lid body 431 and the perpendicular inner wall surface 430is of the case 430. That is, the O-ring 501 can provide the mechanically/electrically integrated electric motor or the electronic control unit 42 having the waterproof property using the perpendicular inner wall surface 430is of the case 430. In addition, the O-ring 501 is in contact with the perpendicular inner wall surface 430is of the case 430. Therefore, it is possible to provide the mechanically/electrically integrated electric motor or the electronic control unit 42 small in size. In other words, if the position of the groove 431d moves to the horizontal top surface 430t of the wall section 430w and the O-ring 501 comes into contact with the horizontal top surface 430t of the wall section 430w of the case 430, the size (the thickness) of the wall section 430w of the case 430 increases and the size (the width “a”) in the radial direction of the case 430 increases. The size (the width “a”) in the radial direction of the case 430 shown in
The external connector of the connector case 440 shown in
In addition, in the example shown in
In a state in which the control section 300 and the power section 100 are fixed to the lid body 431, the control section 300 and the power section 100 can be accommodates in the case 430 (see
Explaining more in detail with reference to
A reduction in the size in the radial direction is realized by disposing, in the axial direction, the connector case 440 including the external connector, the power section 100, and the control section 300.
Further, the lid body 431 includes a main body section 433 extending perpendicularly to the vertical direction and a heat radiation fin 432 extending toward the upper side from the upper surface of the main body section 433.
Since the lid body 431 includes the thermal radiation fin 432 extending toward the upper side, it is possible to more efficiently radiate generated heat of the power section 100. The shape of the heat radiation fin 432 is not limited if the heat radiation fin 432 is designed such that, when the heat radiation fin 432 radiates heat to the upper surface side of the lid body 431, the heat is not held up on the upper surface of the lid body 431. For example, as shown in
In the vehicle-mounted electronic control unit 42, a region further on the inner side than the ECU housing section 420 in plan view includes a connector region 441 where the connector case 440 is disposed and a heat radiation fin region 442 where the heat radiation fin is disposed on the upper surface of the lid body 431.
In the connector region 441, the connector case 440 is in contact with the upper surface of the main body section 433. By adopting such a configuration, it is possible to suppress a tilt of the external connector by setting one side of the main body section 433 and the other side of the connector case 440 in surface contact with each other. Further, since the tilt of the external connector can be suppressed, attachability of the vehicle-mounted electronic control unit 42 is improved.
The power section 300 is thermally in contact with the lower side of the heat radiation fin region 442 in the main body section 433. By adopting such a configuration, it is possible to efficiently radiate, from the heat radiation fin 432, generated heat from the power section 300.
The switching circuits are disposed in a position overlapping the heat radiation fin 432 in the vertical direction.
Since the switching circuits and the heat radiation fin 432 are disposed in the axial direction, it is possible to efficiently radiate generated heat from the switching circuits.
A heat conduction material is disposed between the upper surface of the power section 300 and the lower surface of the main body section 433. A lid groove 432 extending along a portion in contact with the power section 300 is formed on the lower surface of the main body section 433. The main body section 433 includes, on the outer side of the lid groove 432, projecting sections 434 extending along the lid groove 432 and projecting toward the lower side. The projecting sections 434 are disposed on the outer side of the power section 300.
Since the heat conduction material (grease) is present, a heat radiation effect of heat generated from the power board 100 is further improved. Since the lid groove 432 is present, the grease does not scatter and is disposed in a predetermined position. Since the projecting sections 434 that guide the position of the power section 300 are present on the outer side of the groove, it is possible to further suppress the heat conduction material (the grease) from scattering to places other than a place between the power board 101 and the lid body 431.
The power board 100 is fixed to the main body section 433 by fixing members 435. The main body section 433 includes sections to be fixed into which the fixing members 290 are inserted. The sections to be fixed are disposed on the outer side of the lid grooves 432.
The heat conduction material accumulates in the lid groove 432, whereby the heat conduction material is suppressed from reaching the sections to be fixed, to which the fixing members 290 are fixed, present on the outer side of the lid groove 432. Consequently, it is possible to prevent tightening of the fixing member 290 from weakening.
At least a part of the power board 101 overlaps the heat radiation fin 432 and the connector case 440 in the vertical direction.
The power board 101 is disposed in a position where the heat radiation fin 432 and at least a part of the connector case 440 overlap in the motor shaft direction, whereby generated heat of the power board 101 is efficiently radiated by the heat radiation fin 432. Further, the power board 101 is disposed in a position where the connector case 440 and the motor shaft overlap, whereby a reduction in the size in the radial direction of the vehicle-mounted electronic control unit 42 is realized.
The connector region 441 includes a lower connector region 449 on the lower side of the lid body 431 and an upper connector region 448 on the upper side of the lid body 431. The upper connector region 448 has an area larger than the area of the lower connector region 449. That is, the upper connector region is a region where a tabular section 437 and the main body section 433 overlap. The lower region is a region where an internal connector is disposed.
The connector case 440 further includes a plurality of terminals 470 connected to the outside via an external connector, the tabular section 437 spreading perpendicularly to the vertical direction from the lower side of the external connector, and an internal connector 436 projecting further to the lower side than the lid body 431 from the tabular section 437 and including the plurality of terminals 470 disposed on the inside. The internal connector 436 is disposed further apart from the heat radiation fin region 442 than the external connector.
The external connector is disposed further on the heat radiation fin region 442 side than the internal connector 436. Consequently, it is possible to dispose the external connector effectively using the radial direction width of a motor unit. Therefore, attachability of the vehicle-mounted electronic control unit 42 is improved.
Further, by disposing the external connector close to the heat radiation fin region, it is possible to realize a reduction in the size in the radial direction of the external connector. Since the internal connector 436 is away from the heat radiation fin region, it is possible to increase an area of the power board 100 in contact with the main body section.
The external connector includes a connector section to which a torque signal is input.
The plurality of terminals 470 are connected to the control section 300. Portions of the plurality of terminals 470 connected to the control section 300 are exposed from the internal connector 436. With such a configuration, since the portions of the plurality of terminals 470 connected to the control section 300 are exposed from the internal connector 436, it is easy to perform soldering and the like.
The internal connector 436 extends further downward than the lower surface of the power board 101. With such a configuration, the plurality of terminals 470 can be connected to the control section 300 without coming into contact with the power board 101.
The lower surface of the tabular section 437 includes a connector groove 438 that is in contact with the upper surface of the lid body 431 and surrounds the internal connector 436. The O-ring 502 is disposed in the connector groove 438. On the lower surface of the lid body 431, a region not surrounded by the connector groove 438 is larger than a region surrounded by the connector groove 438.
The tabular section 437 is disposed in a position in contact with the upper surface of the lid body 431. Consequently, it is possible to secure an area of the contact of the power board 100 with the lid body 431. The waterproof property is improved by limiting a region waterproofed by the connector groove 438 and the O-ring 502.
Further, since the region is narrow, it is possible to prevent a decrease in the waterproof effect even if the connector slightly tilts.
The ECU housing section 420 includes the wall section 430w, which has the hollow cylindrical shape. The lid body 431 includes, at the outer edge portion of the lower surface, an attaching section 439 recessed in the upward direction. The lower surface of the attaching section 439 is in contact with at least a part of the top surface of the wall section 430w. In a sectional view of the side surface of the attaching section 439 including a recessed section 443 in which the O-ring 501 can be fixed, the wall section 430w includes an inner wall surface 430is corresponding to the recessed section 443 and perpendicular to the lower surface of the lid body 431. The O-ring 501 is in contact with the recessed section 443 of the lid body 431 and the inner wall surface 430is.
Waterproofing can be achieved because the O-ring 501 and the lid body 431 are in contact. Heat can be transferred from the lid body 431 to the wall section 430w because the lower surface of the attaching section 439 and the top surface of the wall section 430w are in contact at least in a part. Therefore, it is possible to further improve the heat radiation efficiency.
The lid body 431 includes the pedestal 431p capable of supporting the upper surface of the control section 300. The control section 300 is fixed to the pedestal 431p via a fixing member 446. The side surface of the internal connector is in contact with the side surface of the pedestal 431p.
It is possible to improve the strength of the internal connector extending from the tabular section 437 to the control section 300.
In the motor, the case 430 further includes the motor case section 447 that accommodates the electric motor 43-2. The ECU housing section 420 and the motor case section 447 are integrally provided.
Since the ECU housing section 420 and the motor case section 447 are integrally provided, it is possible to reduce cost and improve heat transfer efficiency.
Incidentally, as measures for reducing conduction noise (motor noise), at least one electrolytic capacitor 210 (see
The FET 1 and the FET 2 are connected in series between the line of the potential B+ of the positive electrode and the line of the potential B− of the negative electrode. The FET 1 and the FET 2 can generate a U-phase current that flows through, for example, a U winding wire of the electric motor 43. As a current sensor for detecting the U-phase current, for example, the shunt resistor R1 can be provided between the FET 2 and the line of the potential B− of the negative electrode. As a semiconductor relay capable of interrupting the U-phase current, for example, an FET 7 can be provided between a connection node of the FET 1 and the FET 2 and the output terminal U to the electric motor 43.
The FET 3 and the FET 4 are connected in series between the line of the potential B+ of the positive electrode and the line of the potential B− of the negative electrode. The FET 3 and the FET 4 can generate a V-phase current flowing through, for example, a V winding wire of the electric motor 43. As a current sensor for detecting the V-phase current, for example, the shunt resistor R2 can be provided between the FET 4 and the line of the potential B− of the negative electrode. As a semiconductor relay capable of interrupting the V-phase current, for example, an FET 8 can be provided between a connection node of the FET 3 and the FET 4 and the output terminal V to the electric motor 43.
The FET 5 and the FET 6 are connected in series between the line of the potential B+ of the positive electrode and the line of the potential B− of the negative electrode. The FET 5 and the FET 6 can generate a W-phase current flowing through, for example, a W winding wire of the electric motor 43. As a current sensor for detecting the W-phase current, for example, the shunt resistor R3 can be provided between the FET 6 and the line of the potential B− of the negative electrode. As a semiconductor relay capable of interrupting the W-phase current, for example, an FET 9 can be provided between a connection node of the FET 5 and the FET 6 and the output terminal W to the electric motor 43.
In the example shown in the
The FET 1 to the FET 11 and the shunt resistor R1 to the shunt resistor R3 shown in
The vehicle-mounted electronic control unit further includes the first component on the lower surface. The first component includes the at least one electrolytic capacitor 210, a first frame 107 that fixes the electrolytic capacitor 210 and is connected to the power section 100, a leg section 106 that extends in the upward direction from the upper end of the first frame 103 and is in contact with the power section 100, and a connecting section 108 that extends from the first frame 103 toward the control section 300. The at least one electrolytic capacitor 210 overlaps, in the vertical direction, other components mounted on the power section 100.
Since the vehicle-mounted electronic control unit includes the first component, it is possible to dispose the electrolytic capacitor 210 under the other components of the power section 100. It is possible to reduce the power section 100 in size with respect to a direction perpendicular to the vertical direction. Since the connecting section 108 extends from the first frame 103, a wire that should originally be present on the power section 100 is absent. A degree of freedom of a layout of the power section 100 is improved. Alternatively, it is possible to reduce the power section 100 in size.
The at least one electrolytic capacitor 210 is fixed to the side surface of the first frame 103.
Since the electrolytic capacitor 210 is disposed laterally, it is possible to reduce the power section 100 in size in the vertical direction as well.
The connecting section 108 extends in the direction perpendicular to the vertical direction from the lower side of a portion of the first frame 103 where the electrolytic capacitor 210 is fixed.
The connecting section 108 extends in the perpendicular direction from the lower side of the portion where the electrolytic capacitor 210 is fixed. Consequently, it is possible to further reduce the power section 100 in size in the axial direction.
In the example shown in
Note that the FET 1 to the FET 11, the shunt resistor R1 to the shunt resistor R3, and the first component and the second component can be collectively mounted on the surface (the lower surface) of the metal board by, for example, reflow soldering. In other words, the FET 1 to the FET 11, the shunt resistor R1 to the shunt resistor R3, and the first component and the second component can be surface-mounted on the power section 100. Specifically, a joining member such as cream solder (not shown in the figure) is printed in advance between the surface (the lower surface) of the metal board and the components such as the FET 1 to the FET 11 and the shunt resistor R1 to the shunt resistor R3. The components such as the FET 1 to the FET 11 and the shunt resistor R1 to the shunt resistor R3 are attached on the cream solder. Similarly, a joining member such as cream solder (not shown in the figure) is printed in advance in a connection region on the surface (the lower surface) of the metal board. The first component and the second component can be attached on the cream solder. Subsequently, these kinds of the cream solder are heated to connect the FET 1 to the FET 11, the shunt resistor R1 to the shunt resistor R3, and the first component and the second component to the surface (the lower surface) of the metal board.
When, for example, the six FETs 1 to 6 and the four electrolytic capacitors 210 are mounted on the surface (the lower surface) of the metal board, the four electrolytic capacitors 210 are mounted on the first surface (the bottom surface of the frame 103) different from (specifically, orthogonal to) the surface (the lower surface) of the metal board. In other words, the four electrolytic capacitors 210 can be three-dimensionally disposed on the surface (the lower surface) of the metal board. Consequently, it is possible to suppress a protrusion (a protrusion in the radial direction of the motor case 430) of the electronic control unit 42 and provide the electronic control unit 42 small in size. Further, for example, the six FETs 1 to 6 and the first component (and the second component) can be collectively mounted on the surface (the lower surface) of the metal board. Therefore, it is possible to simplify a manufacturing process for the electronic control unit 42.
The vehicle-mounted electronic control unit further includes a second component. The second component includes a plurality of signal lines 109 and a second frame 1104 that bundles the plurality of signal lines 109. The power section 100 and the control section 300 are connected by the plurality of signal lines 109. The plurality of signal lines 109 respectively include bent portions 111 extending in the vertical direction from the control section 100 and being bend in the direction perpendicular to the vertical direction. Electronic components mounted on the power section 100 are disposed on the upper side of the second frame 104 or the bent portions 111.
The power section 100 can be reduced in size in the direction perpendicular to the vertical direction.
The second frame 104 includes a signal-line fixing section 112 that bundles the plurality of signal lines 109, an output-terminal fixing section 113 that bundles a plurality of output terminals 114 extending in the downward direction from the power section 100, and a bridge section 115 that couples the signal-line fixing section 112 and the output-terminal fixing section 113. A direction in which the signal-line fixing section 112 bundles the plurality of signal lines 109 and a direction in which the output-terminal fixing section 113 bundles the plurality of output terminals 114 are substantially parallel.
By adopting such a configuration, it is possible to efficiently dispose the second component on the power section 100. Therefore, it is possible to reduce the power section 100 in size in the direction perpendicular to the vertical direction.
The first frame 103 fixes the plurality of electrolytic capacitors 210 in parallel to the direction in which the power section 100 extends. A direction in which the first frame 103 fixes the plurality of electrolytic capacitors 210 and a direction in which the signal-line fixing section 112 bundles the plurality of signal lines 109 are substantially parallel.
Since the first component and the second component can be efficiently disposed on the power section 100, it is possible to reduce the power section 100 in size in the direction perpendicular to the vertical direction.
The vehicle-mounted electronic control unit shown in
The first component and the second component can be efficiently disposed on the power section 100. Therefore, it is possible to reduce the power section 100 in size in the direction perpendicular to the vertical direction.
The coupling section 118 is disposed between the third frame 107 and the signal-line fixing section 112.
The first component and the second component can be efficiently disposed on the power section 100. Therefore, it is possible to reduce the power section 100 in size in the direction perpendicular to the vertical direction.
In the vehicle-mounted electronic control unit, the coupling section 118 includes a rib 119 extending to the lower side from the lower surface of the coupling section 118. The rib 119 is connected to the inner surfaces of the plurality of control-section holding sections 117.
By adopting such a structure, it is possible to improve the strength of the control-section holding sections 117.
In the vehicle-mounted electronic control unit, the top surface of the rib 119 is in contact with the upper surface of the control section 300.
Positioning accuracy of the control section 300 is improved.
The control circuit shown in
The control circuit can also control semiconductor relays (the FET 7 to the FET 11). In this case, the microprocessor of the control circuit determines ON or OFF of each of the FET 7 to the FET 11. The driving circuit of the control circuit can generate, on the basis of the determination of ON or OFF of the FET 7 to the FET 11, five control signals (gate signals) corresponding to the FET 7 to the FET 11. The plurality of signal lines of the second frame 104 on the metal board shown in
In the example of
A battery 70 for driving having a capacity larger than the capacity of the battery 61 (a battery for electric equipment) is connected to the electric motor 43-2 for driving. An electronic control unit 42-2 for driving can control the electric motor 43-2 and the battery 70 for driving such that electric power of the battery 70 for driving is supplied to the electric motor 43-2 for driving and generated power by the electric motor 43-2 for driving charges the battery 70 for driving. The electric motor 43-2 for driving functioning as both of a driving machine for vehicle traveling and a generator for regeneration can convert speed reduction energy into electric power and generate a regenerative braking force during speed reduction. Specifically, collection of electricity is started at an instance when the driver releases a foot from an accelerator pedal (not shown in the figure). Speed reduction by the electric motor 43-2 for driving can be increased when the driver steps on a brake pedal 611. Consequently, more electricity is generated and the battery 70 for driving is charged. Note that, for example, like the electronic control unit 42 and the electric motor 43 shown in
The electronic control unit 42-2 for driving can perform regenerative cooperative control in which regenerative braking and hydraulic braking are combined. Note that, when the vehicle is an electric vehicle, the rear wheels 3, 3 may be driven by the electric motor 43-2 instead of the steering wheels 29, 29 (the front wheels) or in addition to the steering wheels 29, 29 (the front wheels). Alternatively, when the vehicle is a hybrid vehicle, an output shaft of an engine E (an internal combustion engine) indicated by an alternate long and two short dashes line in
The vehicle can include, for example, a publicly-known disk brake system. A caliper including a disk 2a and a wheel cylinder 2b is provided in, for example, each of the left and right steering wheels 29, 29 (the front wheels). Similarly, a disk 3a and a wheel cylinder 3b are provided in, for example, each of the left and right rear wheels 3, 3. A brake hydraulic pressure generating device 8 is connected to the wheel cylinders 2b, 2b, 3b, and 3b via publicly-known brake pipes.
Note that a pedal position sensor 611a that detects the position of the brake pedal 611 (a pedal position) is provided in the brake pedal 611. The pedal position sensor 611a can detect a step-on amount (a brake operation amount) of the driver with an initial state (e.g., the pedal position=0) set in a state in which the brake pedal 611 is not stepped on by the driver. A signal of the detection is supplied from a pedal position sensor 11a to the electronic control unit 42-1 for the electric servo brake via, for example, an external connector (not shown in the figure) same as the external connector shown in
The electric servo brake system includes the electronic control unit 42-1 for the electronic servo brake. The electronic control unit 42-1 for the electric servo brake performs a part of regenerative control in cooperation with the electronic control unit 42-2 for driving in order to realize a regenerative brake function. The electronic control unit 42-1 for the electric servo brake can generate brake hydraulic pressure of a cylinder (not shown in the figure), which depends on the driving of the electric motor 43-2 included in the brake hydraulic pressure generating device 8, on the basis of a detection signal from the pedal position sensor 11a.
The present invention is not limited to the illustrative best embodiment described above. Those skilled in the art could easily change the illustrative best embodiment to the extent within the scope of claims.
Number | Date | Country | Kind |
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2014-020782 | Feb 2014 | JP | national |
Filing Document | Filing Date | Country | Kind |
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PCT/JP2015/053310 | 2/5/2015 | WO | 00 |