JP3975394B2 - Electric drive control unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a control unit for a drive device powered by an electric motor, and more particularly to a control unit used for an electric vehicle drive device or a hybrid vehicle drive device.
[0002]
[Prior art]
  In recent years, SW element power constituting an inverter for controlling a motor and a drive device on a drive device case that houses a motor (generally referred to as a motor and a generator that operates as a motor in this specification). Inverter-integrated motor drive devices equipped with an inverter case containing modules, capacitors, and the like have been developed. When a drive unit in which a control unit incorporating such an inverter or the like is integrated is mounted in a vehicle, particularly in its engine room, there are various mounting restrictions around the inverter, although it is uniquely integrated. For example, it is necessary to secure a crushable zone in the vehicle front-rear direction, and there are restrictions such as the presence of side members in the left-right direction. In view of this, Japanese Patent Laid-Open No. 2001-11998 proposes a drive device in which a control unit including an inverter or the like is arranged in a form extending from the drive device in a vehicle upward direction with relatively few restrictions.
[0003]
  The control unit of this drive device fixes the inverter switching element power module to the bottom wall of the bottomed rectangular cylindrical inverter case fixed to the top of the drive device case, and projects over the middle of the cylindrical body of the case frame. The smoothing capacitor of the inverter is fixed to the attached mounting portion via a bracket, and the control board is fixed to the top wall of the trunk portion.
[0004]
[Problems to be solved by the invention]
  The positioning of the inverter case in the above prior art for integration with the drive device is appropriate per se, but the following problems to be further improved remain regarding the structure of the inverter case.
[0005]
  (Compact)
  Since the switching element power module of an inverter that handles a large current itself is a heating element, its surface area is generally increased in consideration of cooling performance. On the other hand, since the body of the frame of the inverter case surrounds the power module, it becomes a cylinder having a relatively large area. Therefore, the smoothing capacitor and the control board fixed to the frame must be matched to the area. That is, since the body of the frame is formed in a cylindrical shape having a quadrangular shape, the area of the body is determined by the smoothing capacitor, the control board, and the switching element power module that are fixed to the frame, and having the largest area. Since the other two parts have to be matched to the area, it is inevitable that the three parts are affected in terms of area and a dead space is created around the other two parts.
[0006]
  (Assemblyability)
  Since the bracket that holds the smoothing capacitor is bolted to the projecting part at the center of the case frame body in the height direction, the screw tightening work becomes the work at the back of the frame, and the smoothing capacitor and the body part Since there is only a small gap with the wall, it is extremely difficult to fasten the bracket to the frame through this small space. The same can be said for the operation when connecting the terminals of the smoothing capacitor and the wiring board.
[0007]
  (Manufacturability)
  The case frame has a DC connector support portion projecting toward the inverter / control board housing chamber, a first mounting portion for the capacitor bracket, and a first number for the control board at the lower end, substantially center and upper end of the body portion. 2 mounting parts are provided at three locations in the height direction as parts projecting inward, making it difficult to manufacture the case frame by a general method such as die casting. Necessitates a complicated method, which increases man-hours and costs.
[0008]
  (Seismic resistance)
  Due to the structure of the case frame, the support part for the uppermost part can only be provided around the body part, so that the control board with low bending rigidity is fixed to the frame only at its peripheral part. Since the central portion is easily bent due to vibration or the like, there is a concern about the possibility of occurrence of membrane vibration that adversely affects control.
[0009]
  Therefore, in order to solve these various problems, the present invention adopts a configuration in which the components constituting the control unit are sequentially stacked and fixed in the order of their sizes, thereby achieving compactness, assemblability, and manufacturability. An object of the present invention is to provide an electric drive control unit that is excellent in earthquake resistance.
[0010]
[Means for Solving the Problems]
  In order to achieve the above object, according to the present invention, an electric drive device control including an inverter for controlling an electric motor of a drive device including an electric motor and a control board for controlling the drive device, as described in claim 1. In the unit, the switching element power module of the inverter is accommodated.Bottomed rectangular short cylindricalA first base that is a case frame;Has a rib structure,Place a smoothing capacitor for the inverterIs a bracketA second base, and a third base on which the control board is placed, the second base being,In the case frame as the first baseAt least 4 cornersProvided inBoss part with screw holeOn the mounting attachmentFastened with boltsWhile fixing, the third base is fixed to the second basedidIt is characterized by that.
[0011]
  Further, according to the present invention, as described in claim 2, in an electric drive device control unit that accommodates an inverter for electric motor control of a drive device including two electric motors and a control board that controls the drive device. The switching element power modules for the two electric motors of the inverter are stored side by side.Bottomed rectangular short cylindricalA first base that is a case frame;Has a rib structure,Place a smoothing capacitor for the inverterIs a bracketA second base, and a third base on which the control board is placed, the second base being,In the case frame as the first baseAt least 4 cornersProvided inBoss part with screw holeOn the mounting attachmentFastened with boltsWhile fixing, the third base is fixed to the second basedidIt is characterized by that.
[0012]
  In the above case, as described in claim 3, it is more effective if the smoothing capacitor is configured to be interposed in a smoothing circuit common to the switching element power modules of the two electric motors.
[0013]
  Further, as described in claim 4, each of the switching element power modules has a configuration in which their DC terminals are aligned on one side of the first base and their output terminals are aligned on the other side. It is also effective to do.
[0014]
  In the above configuration, as described in claim 5, it is effective to adopt a configuration in which the smoothing capacitor is fixed to the second base with its terminal directed toward the DC input side of the switching element power module. It is.
[0015]
  In any one of the above-described configurations, as described in claim 6, it is also effective to adopt a configuration in which the control board is fixed to the third base at a peripheral portion and a central portion.
[0016]
  Furthermore, in any one of the configurations described above, as described in claim 7, it is effective that the third base is fixed to the second base via a buffer member.
[0017]
  It is effective that the electric drive device control unit configured as described above is integrated with the drive device as described in claim 8.
[0018]
  In the above case, as described in claim 9, it is more effective if the electric drive device control unit is configured to be attached to the electric drive device in a forward leaning posture with respect to the front of the vehicle.
[0019]
  In the above case, as described in claim 10,The upper part of the case frame is covered with a cover,It is more effective if the front and rear surfaces of the cover are inclined surfaces that are a vertical surface and a horizontal surface when mounted on the vehicle.
[0020]
  In any one of the above-described configurations, as described in claim 11, the third base includes a control board mounting portion on the opposite side to the second base. It is also effective.
[0021]
  Furthermore, in any one of the above configurations, as described in claim 12,in frontIt is also effective that a fastening portion for attachment to the above-described mounting portion is provided at a position coinciding with the above-described mounting portion at the four corners of the second base.
[0022]
  Further, in any one of the above-described configurations, as described in claim 13, a second mounting attachment portion for attaching the control board to at least four corners inside the fastening portion of the second base. A second fastening portion for attachment to the second mounting attachment portion may be provided at a position coincident with the second mounting attachment portion at the four corners of the third base. It is valid.
[0023]
  Furthermore, in any one of the configurations described above, as described in claim 14, the switching element power module, the smoothing capacitor, the second base, and the control are fixed to the case frame together with the case frame. It is also effective to include a cover that covers the substrate and the third base.
[0024]
[Action and effect of the invention]
  In the configuration according to the first aspect, regarding the compactness, the switching element power module, the smoothing capacitor, and the control board constituting the control unit are stacked in the height direction through the base, so that the area Therefore, it is possible to reduce the size of the control unit. Moreover, by setting it as the stacking | stacking structure via such a base, each component can be made into a sub-assembly and can be comprised by the optimal size for itself, without being mutually restricted by the area of two other components. Therefore, in general, the switching element power module, which has to secure the surface area in consideration of cooling performance, is fixed to the largest first base, and the control board which does not require a large area is made the smallest third base. Although the number and size differ depending on the required inverter performance, etc., the smoothing capacitor, which is roughly in the middle of those areas, is fixed on the second intermediate base so that they overlap. Accordingly, the area becomes smaller and the control unit is reduced in size three-dimensionally. Also, with regard to assemblability, each part is simply sub-assembled for each base and simply fixed, so that the work space is not restricted, so that the assemblability is improved. Furthermore, with regard to manufacturability, the shape of each base is simplified by the above-described stacked configuration, and each base can be manufactured by a general method such as die casting. Reduction is possible. As an incidental effect, the switching element power module and the smoothing capacitor are arranged close to each other so that the surge voltage generated by switching can be reduced by shortening their connection. In addition, the second base and the third base serve to shield the switching noise of the switching element and prevent the smoothing capacitor and the control board from being adversely affected by mounting via the base. it can.
[0025]
  Next, in the structure of Claim 2, each said effect is achieved in the control unit for electric drive apparatuses provided with two electric motors.
[0026]
  According to the third aspect of the present invention, the arrangement space for the smoothing capacitor that requires the maximum space in the smoothing circuit of the inverter of the control unit is reduced, and the electric drive provided with two electric motors for driving and power generation The control unit for the apparatus can be made more compact.
[0027]
  Furthermore, in the configuration according to claim 4, the arrangement of the terminals of the switching element power module arranges the routing on the wiring of bus cables, bus panels, etc. connected to them, so that the arrangement space for them is reduced. It is possible to reduce the number of assembly steps.
[0028]
  Further, in the configuration according to claim 5, since the shortest distance connection on the DC circuit between the switching element power module and the smoothing capacitor constituting the inverter is possible, the surge voltage generated by switching of the inverter is further reduced. Can do.
[0029]
  Further, in the configuration according to the sixth aspect, the control board that is easy to bend because it is thin plate-like compared to other parts constituting the control unit, and that is likely to cause membrane vibration due to resonance when vibration is applied, the third control board is provided. Since the rigidity of the base can be increased and the rigidity of the control unit can be improved.
[0030]
  Moreover, in the structure of Claim 7, even when a control unit vibrates, since the propagation of the vibration to a control board can be attenuated with a buffer member, it protects a control board weak to a vibration for the above reason. Therefore, the earthquake resistance of the entire control unit can be further improved.
[0031]
  Further, in the configuration according to claim 8, the control unit integrated electric motor is integrated by integrating the control units which are compact in area and three-dimensionally by the stacking method through the respective bases as described above. The overall configuration of the drive device can be reduced in size, and thereby the mountability of the drive device on a vehicle can be improved.
[0032]
  Further, in the configuration according to the ninth aspect, the control unit extends obliquely upward and forward of the vehicle with sufficient space for mounting on the vehicle on the outer shape of the control unit integrated electric drive device. Thus, it is possible to realize a configuration in which the overall height of the drive device and the increase in the longitudinal dimension are minimized.
[0033]
  Moreover, in the structure of Claim 10, since it can be set as the shape which a protrusion part does not produce in the upper direction and the front of a drive unit on the external shape of a control unit integrated electric drive device, Mountability is further improved.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of an electric drive device control unit according to an embodiment. The control unit includes an electric motor control unit for controlling the electric motor and a control unit for controlling the driving device. The motor control unit is a three-phase AC motor that drives both a drive motor (hereinafter referred to as a motor) and a generator motor (hereinafter referred to as a generator) using a vehicle-mounted battery as a power source. Therefore, the motor control unit is an inverter that controls the motor and the generator. ing.
[0035]
  As is well known, an inverter as an AC / DC converter generally has an electric circuit configuration as shown in FIG. 2, and for the motor M, the inverter DC (battery power source (B) is switched by alternating current ( If the motor is a three-phase AC motor, it is converted to three-phase and supplied to the three-phase coil (U, V, W) of the motor (M). For the generator (G), the three-phase coil (U , V, W) is converted into direct current by a switching action and smoothing by a smoothing capacitor (C) and a choke coil (L) and supplied to the battery power source (B).
[0036]
  In this embodiment, as shown in FIG. 3, the switching circuit portion of the inverter is a switching element power module Um, Ug composed of a switching transistor and an accompanying circuit chip and a circuit board on which they are arranged. In addition, two-pole DC terminals P1 and P2 are arranged on one side of the substrate, and three-pole AC terminals P3, P4 and P5 are arranged on the other side. The smoothing capacitor C of the DC circuit section shown in FIG. 2 is arranged separately from these modules Um and Ug and connected to DC terminals P1 and P2 via a bus panel. The drive unit control unit constitutes an electronic control unit (ECU) mainly composed of a microcomputer and a memory storing various programs and data for controlling the entire drive unit. It is assumed that it takes the form of a control board Uc arranged on the circuit.
[0037]
  Returning to FIG. 1, the case 20 as the first base for housing the control unit is made of an aluminum material for the purpose of heat dissipation and light weight, and the two switching element power modules Um and Ug are connected to their direct currents. The terminals P1 and P2 and the AC terminals P3 to P5 are aligned to have a bottomed rectangular short cylindrical frame structure having a cross-sectional shape that substantially matches the outer shape arranged adjacent to each other. At the four corners of the frame 20 and the center of the side on the side of the three-pole AC terminals P3 to P5, a boss portion having a screw hole is provided, and these are the brackets 23 as the second base for the smoothing capacitor C. It is set as the mounting attachment part 20c.
[0038]
  The switching element power modules Um and Ug are brought into close contact with the finished machining surface of the bottom wall of the case frame 20 that accommodates them, and are brought into close contact with each other so as to ensure the maximum contact area by appropriate means. (This reason will be explained in detail later).
[0039]
  The smoothing capacitor C has three configurations in this embodiment, and the terminal portion (hidden in the back side in FIG. 1) is the DC input side on which the DC terminals P1 and P2 of the switching element power modules Um and Ug are provided. Are arranged side by side on the bracket 23 in the same direction. The bracket 23 is generally plate-shaped having a rib structure for heat dissipation, light weight, and high rigidity, and is formed with a horizontal cylindrical smoothing capacitor housing portion 23a that protrudes upward from the plate surface. A fastening portion 23b in which a bolt through hole is formed in a positional relationship that coincides with the mounting attachment portion 20c of the frame 20 is provided. Further, a total of six bosses extending upward are provided at the four corners on the inner side of these fastening portions 23b and at approximately two intermediate portions of the four corners, and screw holes are formed in these boss portions. It is set as the mounting attachment part 23c (2nd mounting attachment part) of the control board Uc. With respect to the bracket 23 having such a configuration, each of the smoothing capacitors C is fitted in the housing portion 23a, and is fixedly secured by bolting the bracket 23 to the bracket 23 of the stopper applied to the end surface on the terminal side. For the fixing structure, see FIG. 5 below showing the assembly process).
[0040]
  Similarly to the bracket 23, the control board Uc is fixed to the upper surface of the bracket 24 as a substantially third plate having a rib structure with the aim of heat dissipation, light weight, and high rigidity. Fastening portions 24a (second fastening portions) are provided at the four corners of the bracket 24 so as to coincide with the mounting attachment portions 23c of the bracket 23 of the smoothing capacitor C. As shown in FIG. 4, the control board Uc is removed to show only the bracket 24, and the mounting part 24 b of the control board Uc is a boss part slightly protruding from the upper surface of the bracket 24. These boss portions are provided at twelve locations in the vertical and horizontal directions at substantially constant intervals. Then, two other fastening portions 24a are provided at positions avoiding these boss portions in a positional relationship coincident with the mounting attachment portion 23c of the bracket 23. A buffer member 25 made of an elastic material such as rubber is disposed at these fastening portions 24a. These buffer members 25 have a hooked bush shape interposed between the fastening portion 24a and the bolt so as to follow the upper and lower surfaces of the fastening portion 24a and the inner peripheral surface of the bolt through hole.
[0041]
  As shown in FIG. 5, each bracket 23, 24 having the above-described configuration is formed by first aligning the bracket 23 of the smoothing capacitor C with the mounting attachment portion 20 c in the frame 20 and bolting it at five locations. The + and − terminals of the smoothing capacitor C are located at positions protruding upward from the upper end of the frame 20. In this state, the connection of each smoothing capacitor C to the inverter circuit is completed by bolting the bus panel 26 that connects the capacitor terminal and the DC terminals P1, P2 of the inverter. At this time, the position of the DC terminals P1 and P2 of the inverter with respect to the bus panel 26 is extremely shallow when viewed from the upper end of the frame 20, so that bolting of this portion is extremely easy even if it is spatially narrow. . Further, the bus panel 26 can be bolted to the capacitor terminal in a state where there is no spatial restriction.
[0042]
  After the smoothing capacitor C is assembled in this way, the bracket 24 of the control board Uc is placed on the bracket 23 of the smoothing capacitor C protruding above the upper end of the frame 20 so as to be aligned with the mounting attachment portion 23c. As shown in FIG. 6, only the switching element power modules are arranged side by side, the smoothing capacitor C is placed thereon, and the control board Uc is further placed thereon. It becomes a three-story structure confined to. A cover 27 having a hat-like shape at the upper part of the frame 20, that is, the largest outer shape at the mating surface part with the frame, and the upper part gradually narrowing so as to cover the smoothing capacitor C and the control board Uc of the assembled control unit U. The control unit is completed.
[0043]
  Next, an embodiment in which the control unit U having the above configuration is integrated with a drive device for a hybrid vehicle will be described. FIG. 7 shows an axial cross section in which the axes of the driving device are developed on the same plane. This drive device has a generator G arranged on the first axis I, a motor M arranged on the second axis II, a differential device D arranged on the fourth axis IV, and a single pinion configuration arranged on the first axis I. An internal combustion engine (hereinafter referred to as an engine) E showing only the end of the crankshaft in the figure connected to the planetary gear set P on the first shaft I, the main component being the planetary gear set P, and a generator G coaxial therewith Are connected to the differential device D through the planetary gear set P and through the counter gear mechanism T on the third shaft III, and the motor M is directly connected to the differential device D through the counter gear mechanism T. A one-way clutch F for preventing reverse rotation of the engine E and a brake B for preventing idling of the generator G are provided. There is a formed.
[0044]
  As shown in a side view of the actual positional relationship between the respective axes in FIG. 8 as viewed from the connection side with the engine, this drive device has the fourth axis IV on which the differential device D is disposed at the lowest position. The second shaft II with the motor M disposed on the first shaft I is positioned, and the first shaft I with the generator G or the like positioned slightly above the front of the fourth shaft IV (front in the vehicle-mounted state, that is, the right side in the drawing) Has been. In FIG. 8, the third axis does not appear, but this axial position is at a substantially central position of a triangle surrounded by a straight line connecting the axes of the first, second, and fourth axes.
[0045]
  With respect to the drive device having such a configuration, the control unit U shown in FIG. 1 is provided with a motor mounting surface of the control unit U as shown in FIG. 8 in order to reduce the overall height of the device in an integrated state with the drive device. The motor M and the generator G are connected so as to be substantially in contact with the outer diameters of the motor M and the generator G, and the heights of the shaft positions of the motor M and the generator G are different. The relationship between the forward tilting posture and the shape of the cover 27 is such that the front surface of the cover 27 is substantially perpendicular to the vehicle and the rear surface is substantially horizontal, so that the shape of the entire drive device is forward and upward. This is useful for creating a compact external shape without protrusions.
[0046]
  The control unit U in this embodiment is composed of the bottom wall of the case frame 20 because the switching element power modules Um and Ug that handle a large current among these components constituting the control unit U generate a large amount of heat from the component chips. In order to cool by contacting with a heat sink H (see FIG. 7), it is arranged on the bottom wall side by side on the bottom, and the capacitor C for the smoothing circuit of the inverter is arranged on the upper part as described above. The control board Uc is arranged.
[0047]
  In this embodiment, ATF (automatic transmission fluid: referred to as oil in this specification) is circulated in the drive unit case 10 for lubrication of each part of the mechanism of the drive unit and cooling of the motor M and the generator G. The system is cooled by heat exchange with another coolant (for example, using water, antifreeze liquid, etc.), and the control unit U is integrated with the drive unit, and the system is cooled by heat exchange with the coolant. Therefore, the cooling device is arranged at the connecting portion between the driving device and the control unit U.
[0048]
  The cooling device includes an oil reservoir 11 formed on a mating surface on the drive device case 10 side, a finned heat transfer wall 12 made of a material having a good thermal conductivity such as an aluminum material that constitutes a lid that covers the oil reservoir 11, Each component of the control unit U is accommodated, and similarly configured by a heat sink H formed on the bottom wall portion 20a of the case frame 20 made of a material having good thermal conductivity such as an aluminum material. The oil reservoir 11 on the side of the drive unit case 10 constitutes an oil passage in the middle of an oil circulation path using an oil pump O that is drivingly connected to the carrier of the planetary gear set P as a pressure feed source. An appropriate oil reservoir amount is always maintained by adjusting the flow rate using an orifice (not shown) provided. The heat sink H on the case frame 20 side is in contact with the switching element power modules Um and Ug for the motor M and the generator G of the control unit U, and has a U-shaped cross section in which the lower part formed in the heat sink H is opened. The coolant flow path L which consists of this groove 20b is provided. The open surface side of the groove is closed by a heat insulating wall 22 as a wall member constituting the groove lid.
[0049]
  The heat sink H in contact with the switching element power modules Um and Ug for the motor M and the generator G of the control unit U is formed in a form in which the bottom wall 20a of the case frame 20 is raised above the mating surface with the drive device case 10. . A continuous recess is formed as a groove 20b having a U-shaped cross section in the bottom wall 20a, and a heat insulating wall 22 as a wall member is fixed by being attached to the open surface side of the groove 20b. The heat insulating wall 22 defines a coolant flow path L in the heat sink H in cooperation with the groove 20b of the bottom wall 20a.
[0050]
  Coolant is fed into the heat sink H by pressure feeding by an electric pump (not shown) separately provided, and through an appropriate external pipe (not shown), from the inlet hole in the peripheral wall of the case frame 20. The low-temperature fluid that has entered the coolant flow path L is immediately introduced directly under the heat generating chip of the switching element power module Ug for the generator, and especially the chip portion of the switching element power module Ug for the generator by heat exchange with a sufficient temperature gradient. Cool down. After that, it is led directly under the heat generating chip of the motor switching element power module Um through a communication path between the generator switching element power module Ug and the motor power module Um, and the chip portion is cooled preferentially. In this way, the coolant exiting the heat sink H passes through the opening of the heat insulating wall 22, wraps around the lower side of the wall, and flows through the mating surface portion with the drive device case 10, thereby exchanging heat with the finned heat transfer wall 12. This time, the oil in the oil reservoir 11 (see FIG. 3) is cooled. The coolant that has undergone a series of heat exchange by flowing through the mating surface portion enters the heat sink H side again from the return opening of the heat insulating wall 22, and passes through an appropriate hole (not shown) from the outlet hole of the peripheral wall of the case frame 20 to cool the engine. It returns to the refrigerant reservoir connected to the suction side of the electric pump via a radiator or a heat sink such as a dedicated cooler.
[0051]
  In the cooling device of this embodiment, the coolant is shared for the cooling of the switching element power modules Um and Ug and the cooling of the oil. However, because of the flow path arrangement, the coolant is first switched to the switching element power via the heat sink H. After the modules Um and Ug are cooled, the oil for cooling the motor M and the generator G is cooled, so that the coolant temperature can be kept lower on the heat sink H side than on the heat transfer wall 12 side. This cooling mode is related to the fact that the heat resistance temperature of the switching element power modules Um, Ug is lower than the heat resistance temperature of the motor M and the generator G, and the temperature of the oil as the coolant for cooling the motor M and the generator G is When the load on the motor M or the generator G that requires sufficient cooling is large, the temperature is much higher than the temperature of the switching element power modules Um and Ug. Nevertheless, since a sufficient temperature gradient is generated between the oil that sandwiches the heat transfer wall 12, this depends on being able to perform efficient cooling.
[0052]
  Further, in the cooling order as described above, the cooling device portion interposed between the drive device case 10 and the unit case frame 20 itself has a high temperature oil between the heat sink H side and the heat transfer wall 12 side. It effectively functions as a heat insulating means for preventing the heat from being transferred to the switching element power modules Um and Ug. From this, even when the oil temperature of the heavy load increases, it is possible to prevent the coolant temperature from rising until it exceeds the heat resistance temperature of the switching element power modules Um and Ug. Therefore, by synergy of the above-described actions, the power modules Um, Ug, the motor M, and the generator G can be efficiently cooled according to their heat resistance while using the same coolant.
[0053]
  As described above in detail, according to this embodiment, with respect to the control unit U, the smoothing capacitor C is fixed on the switching element power modules Um and Ug, and the control board Uc is fixed on the smoothing capacitor C to control the inverter. Since the module is formed by stacking the substrates in the height direction, the area is reduced in size. In addition, by modularizing each part by bracket fixing, each can be sub-assembled and configured with an optimum size, so that each other is not affected by the area of the other two parts. The switching element power modules Um and Ug, which must secure a surface area in consideration of cooling performance, are fixed to the first base having the largest area, and the control board which does not require an area is fixed to the third base having the smallest area. Although the number and size differ depending on the required performance of the inverter, etc., these bases are fixed by fixing a smoothing capacitor having an intermediate area to the second base of the intermediate area. Since it becomes the structure which becomes smaller in area as it overlaps, it can be reduced in size three-dimensionally.
[0054]
  In addition, since the work procedure is such that each part is fixed to the base and sub-assembled, and these are simply stacked and fixed, the work space is not restricted and the assemblability is improved. Furthermore, since each base can be manufactured by a general method such as die casting, man-hours and costs can be reduced. In addition, since the switching element power modules Um and Ug and the smoothing capacitor C are connected by a short path on the circuit connection by the bus panel 26, a surge voltage due to switching of the switching element can be reduced. Further, the second base and the third base serve to shield the switching noise of the switching elements from the relationship of the stacked positions, and prevent the smoothing capacitor C and the control board Uc from being adversely affected. Can do.
[0055]
  The present invention has been described in detail based on the embodiment in which the present invention is applied to a drive device for a hybrid vehicle.However, the present invention is not limited to this embodiment, and at least an electric motor such as a drive device for an electric vehicle is used for control. The present invention is applicable to all drive devices that require an inverter, and can be implemented with various specific configurations within the scope of the matters described in the claims.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a control unit of a hybrid vehicle drive device according to an embodiment of the present invention.
FIG. 2 is an electric circuit diagram showing a general circuit configuration of an inverter of a control unit.
FIG. 3 is a circuit plan view showing a substantial configuration of a switching element power module of the inverter.
FIG. 4 is a perspective view showing a detailed structure of a bracket on which a control board of the control unit is placed.
FIG. 5 is a perspective view showing a form after the capacitor is assembled in the control unit.
FIG. 6 is a perspective view showing a form after the control board is assembled in the control unit.
FIG. 7 is an axially developed cross-sectional view of a hybrid vehicle drive device in which a control unit is integrated.
FIG. 8 is a side view of the hybrid vehicle drive device as viewed from the engine coupling side.
[Explanation of symbols]
M motor (electric motor)
G generator (electric motor)
U control unit
Uc control board
Ug, Um Switching element power module
C Smoothing capacitor
P1, P2 DC terminal
20 Case frame (first base)
23 Bracket (second base)
24 Bracket (third base)
25 cushioning member
27 Cover

Claims (14)

In an electric drive device control unit that houses an inverter for motor control of a drive device including an electric motor and a control board that controls the drive device,
A first base that is a bottomed rectangular short cylindrical case frame that houses the inverter switching element power module;
A second base that has a rib structure and is a bracket on which the smoothing capacitor for the inverter is placed;
A third base for mounting the control board;
With
Said second base, said provided at least four corners of the case frame as the first base, while fastened by bolts to the置取mounting portion mounting a boss threaded holes are formed, The electric drive unit control unit, wherein the third base is fixed to the second base. In an electric drive device control unit containing an inverter for controlling an electric motor of a drive device including two electric motors, and a control board for controlling the drive device,
A first base that is a bottomed rectangular short cylindrical case frame that houses the switching element power modules for the two electric motors of the inverter side by side;
A second base that has a rib structure and is a bracket on which the smoothing capacitor for the inverter is placed;
A third base for mounting the control board;
With
Said second base, said provided at least four corners of the case frame as the first base, while fastened by bolts to the置取mounting portion mounting a boss threaded holes are formed, The electric drive unit control unit, wherein the third base is fixed to the second base.   The electric drive device control unit according to claim 2, wherein the smoothing capacitor is interposed in a smoothing circuit common to the switching element power modules of the two electric motors.   4. The electric drive unit control unit according to claim 2, wherein each of the switching element power modules is arranged with their DC terminals aligned on one side of the first base and their output terminals aligned on the other side. 5. .   The electric drive device control unit according to any one of claims 1 to 4, wherein the smoothing capacitor is fixed to the second base with a terminal thereof facing a DC input side of the switching element power module.   The electric drive device control unit according to claim 1, wherein the control board is fixed to the third base at a peripheral portion and a central portion.   The electric drive device control unit according to claim 1, wherein the third base is fixed to the second base via a buffer member.   The electric drive device control unit according to claim 1, wherein the electric drive device control unit is integrated with the drive device.   The electric drive device control unit according to claim 8, wherein the electric drive device control unit is attached to the drive device in a forward leaning posture with respect to the front of the vehicle. The electric drive device control unit according to claim 9 , wherein an upper portion of the case frame is covered with a cover, and a front surface and a rear surface of the cover are inclined surfaces which are a vertical surface and a horizontal surface when mounted on the vehicle.   The electric drive device control unit according to any one of claims 1 to 10, wherein the third base has an attachment portion for the control board on a side opposite to the second base. A position consistent with the previous SL before described置取mounting portion of the four corners of the second base, any one of the preceding claims, the fastening portion is provided for attachment to the front according置取mounting portion The electric drive unit control unit described.   Second mounting mounting portions for mounting the control board are provided at least at four corners inside the fastening portion of the second base, and the second mounting at the four corners of the third base is provided. The electric drive unit control unit according to claim 12, wherein a second fastening portion for attachment to the second mounting attachment portion is provided at a position coinciding with the attachment portion. A cover fixed to the case frame and provided with the case frame, the cover covering the switching element power module, the smoothing capacitor, the second base, and the control board and the third base. The electric drive unit control unit according to any one of 9 and 11-13.

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