JP2012095482A - Power supply control device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply control device for vehicle, which has a shock blocking means which appropriately blocks power supply of a high voltage battery when collision of vehicles occurs, while achieving a means for easily detecting deformation of the PCU case and miniaturization of the detection means.SOLUTION: A PCU (power control unit) 3 is directly mounted on a transaxle 2, and the transaxle 2 has first and second motor generators 21 and 22, and a differential gear 23. The PCU 3 contains: an IPM 34 which controls two motor generators; a control board 19 on which a control device which controls the IPM 34 is arranged; a reactor 31 for boosting the battery voltage; a DC/DC converter 32 for charging an auxiliary battery; a connector 35 which connects these modules and a power cable 36; a water jacket 33 which cools the IPM 34 and the DC/DC converter 32, etc.; and a contact detection means 10.

Description

  The present invention relates to a power supply control device for a vehicle, and in particular, includes a power conversion device that converts power supplied from a battery into power for load driving, a control board that controls the power conversion device, and a case that accommodates these. The present invention relates to a power supply control device for a vehicle.

  In recent years, electric vehicles and hybrid vehicles combining an engine and an electric vehicle have been put into practical use, and hybrid vehicles and the like have begun to spread. Such a hybrid vehicle or the like is equipped with a drive circuit that controls the power of the high-voltage battery by an inverter and supplies it to the motor generator to drive the vehicle. Examples of the drive circuit include an inverter for controlling the motor generator and a converter for stepping down the power of the high voltage battery to a low voltage for charging the auxiliary battery. An inverter, a converter, etc. are integrated as one power control unit (PCU), and since the handled voltage becomes a high voltage of several hundred volts, a plurality of safety measures are taken.

  One of the safety measures is to cut off the power supply from the high-voltage battery and related equipment and prevent the electric power from being received by a service person who repairs and inspects the vehicle accidentally touching the high-voltage equipment. There are interlocking means to prevent inadvertent supply. In addition, as another safety measure, impact blocking means for properly cutting off the power supply of the high-voltage battery in the event of a vehicle collision accident, and high-voltage equipment is unlikely to be damaged in the event of a vehicle collision accident. Therefore, there is an impact absorbing means for absorbing an impact by a case of a high voltage device, a bracket for holding the high voltage device, or the like.

  As an example of the impact blocking means, when the vehicle receives an impact due to a collision or the like, there is an apparatus that detects the impact by an acceleration sensor installed in the vicinity of the high voltage device and interrupts the power supply. However, there is a transaxle connected to the engine or suspension in the vicinity of the high-voltage equipment, and when a local impact occurs on the acceleration sensor, the acceleration sensor mistakenly detects the local impact as a vehicle collision. Even if there is no leakage from the high-voltage device, there is a risk of interrupting the power supply. In order to avoid such a problem, there is a vehicle power supply control device disclosed in Patent Document 1.

  FIG. 7 shows one conventional example of a vehicle power supply control device. A hybrid vehicle 100 in FIG. 7A includes an engine 101 mounted in an engine room, a motor unit 102 directly connected to the engine 101, drive wheels 103 driven by the engine 101 and the motor unit 102, An inverter unit 104 that controls the power supply for the vehicle is disposed.

  The inverter unit 104 includes a control device (not shown), a case that is housed in the inverter case 105 and that opens below the inverter case 105, and a lid 106 that covers the case opening. Note that the inverter unit 104 in FIG. 7A is provided below the motor unit 102 due to restrictions on the mounting space in the vehicle, and the inverter case 105 has no other components between the road surface and the inverter case 105. Placed in position.

  FIG. 7B is an enlarged view of the inverter unit 104 of FIG. In Patent Document 1, a conductor film 108 is provided on the inner side (the inner surface 109 of the lid) of the inverter case 105 so that the resistance value is electrically changed or disconnected when the lid 106 is deformed by an impact load caused by a vehicle collision. Yes. When the resistance value of the conductor film changes due to an impact load, the control device detects a collision based on a change in the current value flowing through the conductor film 108, and cuts off the power supply to the high voltage device based on the detection result.

  However, since the impact blocking means of the above-mentioned patent document 1 needs to attach the conductor film 108 to the inner surface 109 of the lid and detect a change in the current value by the current sensor to judge the collision, the conductor film, the current sensor and the additional It is necessary to attach an electronic circuit or the like, which causes a cost increase. Therefore, Patent Document 2 discloses a power shut-off device that does not require these acceleration sensors and additional electronic circuits.

  The power shutoff device of Patent Document 2 includes a power supply circuit having a battery, a load, and a relay, a relay control unit that controls connection / disconnection of the battery and the load by controlling the relay, and a relay control unit and a relay in the event of a vehicle collision. And a cutting blade for breaking or grounding a signal line provided between the two. Such a configuration eliminates the need for sensors and control circuits associated with collision detection.

JP 2008-154315 A JP 2004-159439 A

  Conventionally, a power control unit (PCU) that consolidates boosters, inverters, DC / DC converters, etc., is a separately installed type using a dedicated bracket below the motor unit or on the transaxle for the purpose of shock absorption. Although it was mounted on a vehicle as a PCU, a direct installation type in which the PCU is directly mounted on a transaxle (T / A) is being studied in order to meet the demands for downsizing and reducing the number of parts. If the PCU is of the direct installation type, for example, the effect of absorbing the impact cannot be expected by moving the PCU over the mounting bracket of the transaxle, so that strengthening of the case and reliable impact blocking means are required.

  Therefore, it is conceivable that by using the reliable shock blocking means of Patent Document 2, even if the PCU is directly placed, the number of components can be reduced without strengthening the special case. However, the mechanism of the cutting blade that cuts the drive circuit of the relay has not been easily reduced in size.

  For the above reasons, the power control apparatus for a vehicle according to the present invention realizes a means for easily detecting the deformation of the PCU case and the size of the detecting means, and supplies power to the high voltage battery when a vehicle collision accident occurs. An object of the present invention is to provide a power control device for a vehicle having an impact blocking means for appropriately blocking the above.

  In order to achieve the above-described object, a power control device for a vehicle according to the present invention includes a power conversion device that converts power supplied from a battery into power for driving a load, and a control that controls the power conversion device. A power supply control device for a vehicle having a board and a case for housing them, wherein the control board housed in the case includes at least one of a plurality of signal terminals, a case inner surface in front of the vehicle, and the signal terminals. It has a contact detection terminal arrange | positioned so that one signal terminal may contact by the collision of a vehicle, It is characterized by the above-mentioned. By adopting such a configuration, it is possible to configure the shock detection structure only with the lead frame of the signal terminal.

  Further, in the vehicle power supply control device according to the present invention, the control board is horizontally or forwardly inclined and mounted on the vehicle, and the contact detection terminal has the front end of the signal terminal extending vertically from the control board forward. It is a bent terminal. With this configuration, the contact detection terminal comes into contact before the case touches the control board, and a collision can be detected.

  Further, in the vehicle power supply control device according to the present invention, the contact detection terminal is disposed at a predetermined distance from the inner surface of the case, and becomes a ground potential by contacting the inner surface of the case. And

  Further, in the vehicle power supply control device according to the present invention, the contact detection terminal further includes a terminal in which a tip of a signal terminal extending vertically from the control board is bent in the left-right direction. . With such a configuration, in addition to the impact from the front side of the vehicle, it is possible to detect a collision from the side surface of the vehicle.

  Further, in the power supply control device for a vehicle according to the present invention, the control board switches from the battery to the power conversion device by turning off a relay that connects the battery and the power conversion device based on a signal from the contact detection terminal. Stop power supply. By such processing, it is possible to suitably realize the impact blocking means.

  By using the power control device for a vehicle according to the present invention, the impact detection structure can be configured only by the lead frame of the signal terminal, so that the cost can be reduced and the connection to the signal detection board is easy. There is an effect of becoming.

It is sectional drawing explaining the power supply control apparatus for vehicles which concerns on embodiment of this invention. It is sectional drawing explaining the state when the power supply for vehicles of FIG. 1 receives the impact load by the collision of a vehicle. It is explanatory drawing explaining the control board and IPM which comprise the power supply control apparatus for vehicles of FIG. It is explanatory drawing explaining the shape of the contact detection terminal provided in the power supply control apparatus for vehicles of FIG. It is a block diagram which shows the structure of the drive system which has the power supply for vehicles of this embodiment. It is a flowchart figure which shows the flow of a process of a control apparatus when the power supply for vehicles of FIG. 1 receives the impact load by the collision of a vehicle. It is explanatory drawing explaining the prior art example in the power supply control apparatus for vehicles.

  Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described with reference to the drawings.

  FIG. 1 shows an outline of a power supply control device for a vehicle, and shows a cross section of a transaxle 2 and a power control unit 3 (PCU) having contact detection means 10 capable of detecting contact by a contact detection terminal 11. ing. The PCU 3 constituting the power control device for a vehicle is directly mounted on the transaxle 2, and the transaxle 2 includes a first motor generator 21 (MG1), a second motor generator 22 (MG2), a differential gear 23, and the like. have.

  The PCU 3 is an intelligent power module (IPM) 34 that modularizes an IGBT transistor, a flywheel diode (FWD), an upper arm high voltage drive circuit, a lower arm high voltage drive circuit, and the like that control two motor generators. The control board 19 on which the control device for controlling the IPM 34 is arranged, the reactor 31 for boosting the battery voltage, the DC / DC converter 32 for charging the auxiliary battery, these modules and the power cable 36 A connector 35 for connecting the IPM 34, a water jacket 33 for cooling the DC / DC converter 32, etc., a contact detecting means 10 for realizing the impact blocking means in cooperation with the control device, and a case for housing these. An upper lid 24 and a lower lid 25 are included. The IPM 34 and the control board 19 are connected by a lead frame extending from the IPM or a lead frame extending from the board.

  FIG. 2 shows a state where the vehicle power supply control device (PCU 3) of FIG. 1 receives an impact load due to a vehicle collision. In the present embodiment, the PCU 3 receives the impact load evenly at the center of the vehicle and the outside of the vehicle at the time of a frontal collision, and receives either a large impact load at the outside of the left or right vehicle at the time of an offset collision. It is designed so that at least the front surface of the PCU 3 is crushed.

  As shown in FIG. 2, when the PCU 3 receives an impact load, the upper lid 24 made of aluminum die-casting is crushed, and the contact detection terminal 11 (lead frame) extending from the control board 19 via the IPM 34 contacts the inner surface of the upper lid 24. become. Since the upper lid 24 is at the ground potential, the control device cuts off the power supply from the battery based on the processing described later by changing the contact detection terminal 11 from the distribution impedance state to the ground potential. Next, the contact detection terminal 11 will be described in detail.

  FIG. 3 shows the control board 19 and the IPM 34 constituting the vehicle power supply control device (PCU 3) of FIG. 1, and FIG. 4 shows the contact detection terminal 11 provided in the vehicle power supply control device of FIG. The shape is shown. 3A shows a top view of the control board 19, and FIG. 3B shows a front view of the control board 19. As shown in FIG.

  Many of the control electrodes 16 (also referred to as control terminals) extending from the control board 19 control the IPM IGBT transistor, but the contact detection terminal 11 is an electrode bent toward the front side of the vehicle, and is similarly contacted. The detection terminal 15 is an electrode bent toward the side of the vehicle. Note that the characteristic feature of the present embodiment is that the contact detection terminal extended from the control board 19 is used to prevent the impact detection load from causing excessive displacement of the contact detection terminal and plastic deformation in a direction in which the contact detection terminal does not appear. Nos. 11 and 15 are folded at the insulating part of the IPM and protruded from the IPM 34 in a predetermined direction. With such a configuration, the deformation of the contact detection terminals 11 and 15 remains elastic deformation without using a member that supports the contact detection terminals 11 and 15, and a suitable impact load can be detected. Become. The dashed line in FIG. 3A shows the deformation of the upper lid when an impact load is applied from the front or the side, and at least one contact detection terminal is changed to the ground potential by the impact load.

  FIG. 3C shows an enlarged view of the control board 19 and the IPM 34. In the central part of the IPM 34, there is an IGBT transistor arrangement area, and a plurality of IGBT transistors, free wheel diodes, and the like are arranged. Further, the outer peripheral portion of the IPM 34 is made of an insulating member, and the number of components can be reduced by using the outer peripheral portion as a support member for the contact detection terminals 11 and 15. Furthermore, the front end portions of the contact detection terminals 11 and 15 have a quadrangular pyramid contact shape, thereby improving electrical connectivity with the inner surface of the lid.

  4A to 4D show the tip shape of the contact detection terminal in this embodiment, and show an example of the shape that makes electrical contact with the upper lid 24. FIG. These contact detection terminals are preferably selected according to the state of the inner surface of the upper lid of the contact partner. For example, FIG. 4A shows a needle-like tip shape, which is suitable when the inner surface of the upper lid 24 has many irregularities. 4B is an inverted conical shape like a nail head and has a wide contact area and outer peripheral shape, which is suitable for improving detection accuracy in frontal collision, offset collision, and the like. FIG. 4C shows a spherical selection shape, which is suitable when the inner surface of the upper lid 24 is smooth. Further, FIG. 4D is designed such that a rectangular grid-like unevenness is provided on the inner surface of the upper lid, and a contact detection terminal having a square shape and a flat tip is engaged with the unevenness. As the tip of the contact detection terminal fits into the irregularities on the inner surface of the upper lid, reliable detection is possible.

  FIG. 5 shows the configuration of the drive system 1 in the present embodiment. The drive system 1 mounted on the vehicle has a high voltage battery 49, an auxiliary battery 42, and a power control unit 3. The power control unit 3 constituting the power supply control device for the vehicle includes a booster 41 that boosts the voltage of the high-voltage battery 49, an inverter 44 that controls the motor generator 45, a smoothing capacitor 46 that smoothes the voltage, The DC / DC converter 32 that charges the 12V auxiliary battery 42, the contact detection terminal 11, the photocoupler 13, the transistor 14, and the control device 12 are used as an inverter 44, DC / DC It has relays 47 and 48 which are system main relays (SMR) for supplying / cutting off to the DC converter 32 and the like, transistors 51a and 51b for driving the relays 47 and 48, and a control device 12 for controlling them. Yes.

  Here, since the contact detection terminal 11 connected to the control device 12 is arranged in the vicinity of the control board and the IPM constituting the inverter 44, a short circuit is prevented by providing an insulating circuit. The circuit configuration is not limited to a diode and a transistor, and a circuit configuration such as an insulation transformer may be used.

  FIG. 6 shows a flow of processing of the control device 12 when the vehicle power source of FIG. 1 receives an impact load due to a vehicle collision, and details the flow of processing together with the drive system 1 of FIG. This process is a timer interruption process that is periodically executed, and the control device 12 processes the contact detection in step S10 at a predetermined time. In step S10, the control device 12 inspects the output potentials of the transistors 14 connected to the plurality of contact detection terminals 11 and 15 one after another, and the output of the transistor 14 is 12V when one of the contact detection terminals falls to the ground potential. Whether or not (Hi) is set is checked, and the process proceeds to step S12.

  In step 12, it is confirmed whether there is a terminal that falls to the ground potential (the output of the transistor 14 changes from the high impedance state to the Hi state) among the contact detection terminals 11 and 15, and if no contact is detected. In such a case, the process proceeds to step S14, the interrupt process is terminated with no impact on the PCU 3, and the process returns to the main routine before the interrupt. In this case, the relays 47 and 48 which are system main relays (SMR) remain on, and the electric power of the battery 49 is supplied to the booster 41, the inverter 44 and the DC / DC converter 32 via the relays 47 and 48. The motor generator 45 is controlled by the inverter 44.

  On the other hand, if contact is detected in step S12, the process moves to step S16, where it is determined that the PCU 3 has received an impact, and the process moves to step S18 to actually execute the impact blocking means. In step S18, the control device 12 turns the transistors 51a and 51b from on to off in order to turn off the relays 47 and 48, which are system main relays (SMR). In step S20, the processing such as stopping the inverter 44 of the PCU 3 and discharging the charges accumulated in the smoothing capacitor and the booster capacitor is executed, and then the interrupt processing is terminated and the process returns to the main routine before the interrupt.

  As described above, by using the vehicle power supply control device according to the present embodiment, the impact detection structure can be configured only by the lead frame of the signal terminal, so that the cost can be reduced and the signal can be transmitted. Connection to the substrate to be detected is also facilitated.

  In another modification of the present embodiment, by arranging another contact detection terminal that is always at ground potential when the case is closed on the rear side of the vehicle, power from the high-voltage battery is opened when the case is opened. The power of the high-voltage battery when a vehicle crash occurs due to the interlock means that cuts off the supply and prevents the power from being inadvertently supplied and the contact detection terminal arranged in the front or side of the vehicle Needless to say, it is possible to configure a vehicle power supply control device that also has an impact blocking means for appropriately blocking supply, and it is possible to reduce the size and the number of components.

DESCRIPTION OF SYMBOLS 1 Drive system, 2 transaxle, 3 Power control unit, 10 Contact detection means, 11, 15 Contact detection terminal, 12 Control apparatus, 13 Photocoupler, 14, 51a, 51b Transistor, 16 Control electrode, 19 Control board, 21, 22, 45 Motor generator, 23 Differential gear, 24 Upper lid, 25 Lower lid, 31 Reactor, 32 DC / DC converter, 33 Water jacket, 35 Connector, 36 Power cable, 41 Booster, 42 Auxiliary battery, 44 Inverter, 46 Smoothing capacitor, 47, 48 relay, 49 battery, 100 hybrid vehicle, 101 engine, 102 motor unit, 103 drive wheel, 104 inverter unit, 105 inverter case, 106 lid, 108 conductor film, 10 The inner surface of the lid.

Claims (5)

A power supply control device for a vehicle having a power conversion device that converts power supplied from a battery into power for driving a load, a control board that controls the power conversion device, and a case that accommodates these,
The control board accommodated in the case includes a plurality of signal terminals, a contact detection terminal arranged so that a case inner surface in front of the vehicle and at least one signal terminal of the signal terminal come into contact with each other due to a vehicle collision, A power supply control device for a vehicle characterized by comprising: The vehicle power supply control device according to claim 1,
The control board is mounted on the vehicle tilted horizontally or forward,
The vehicle power supply control device, wherein the contact detection terminal is a terminal whose front end of a signal terminal extending vertically from the control board is bent forward. A power supply control device for a vehicle according to claim 1 or 2,
The contact detection terminal is disposed at a predetermined distance from the inner surface of the case, and is a power supply control device for a vehicle that becomes a ground potential by contacting the inner surface of the case. The power supply control device for a vehicle according to claim 3,
Further, the contact detection terminal includes a terminal in which a tip of a signal terminal extending vertically from the control board is bent in the left-right direction. The vehicle power supply control device according to any one of claims 1 to 4,
The control board is a power supply control device for a vehicle that stops power supply from the battery to the power conversion device by turning off a relay that connects the battery and the power conversion device based on a signal from the contact detection terminal.

Images