JP5699693B2 - Vehicle collision detection device - Google Patents

Description

  The present invention relates to a vehicle collision detection device, and more particularly to a vehicle collision detection device using a case that houses an electrical device such as an inverter.

  In a hybrid vehicle, an electric vehicle, a fuel cell vehicle, etc., an electric device such as an inverter is operated by electric power from a high-voltage power source, and therefore, the vehicle receives a significant impact due to a collision and the level of the impact is the strength of the electric device. If the durability is exceeded, the device may be damaged, and high voltage power may leak depending on the degree of damage to the electrical system. In order to prevent such a situation, it is necessary to quickly detect a vehicle collision, cut off the power supply from the power source at the time of the collision, and quickly discharge the charge accumulated in the high-voltage capacitor.

  The following Patent Document 1 discloses a configuration in which a conductor film that is electrically disconnected when the lid is deformed is stretched around the inner surface of the lid of the case that houses the inverter. The ECU detects the current value I flowing through the conductor film and determines whether or not the current value I is substantially zero. If it is substantially zero, it is determined that the inverter has received an impact, and the system main relay is turned off so as to cut off the power from the traveling battery. Further, the inverter is stopped so that the motor generator cannot be operated with the motor generator being in an inoperative state.

JP 2008-154315 A

  Although the configuration in which the conductor film is stretched around the inner surface of the lid of the case that houses the electrical device such as the inverter is effective as a method for detecting deformation of the lid due to the collision, the step of forming the conductor film as a dedicated product for deformation detection Is required separately. For this reason, when detecting an impact by detecting the deformation of the case, it is desirable to be able to detect the impact without increasing the number of processes or the number of dedicated parts. At the same time, since the impact can occur from any direction, it is also necessary to stop the operation of the high-pressure system by detecting the deformation of the case in any direction.

  An object of the present invention is an apparatus that can detect a collision by reliably detecting deformation of a case that houses an electrical device such as an inverter due to an impact from an arbitrary direction without increasing the number of parts. Is to provide.

The present invention is a vehicle collision detection device, and is arranged to be electrically connected to an electrical device, a case that houses the electrical device, and a terminal of the electrical device, and circulate around an inner periphery of the case. A relay bus bar, and a controller that is connected to the relay bus bar, monitors the voltage of the electrical device using the relay bus bar as a voltage detection line, and detects a collision by detecting a voltage change of the relay bus bar; The case is provided with a flange so as to protrude outward from the case, and the relay bus bar is disposed in the flange .

Further, the present invention is a vehicle collision detection device, wherein the electric device, a case that houses the electric device, and a terminal of the electric device are electrically connected to circulate around the inner periphery of the case. A relay bus bar arranged and a control connected to the relay bus bar and monitoring the voltage of the electrical device using the relay bus bar as a voltage detection line and detecting a voltage change of the relay bus bar The case is provided with a flange so as to protrude from the case to the outside, and the relay bus bar is on the inner surface of the case and substantially the same surface as the surface on which the flange is formed. It is characterized by being arranged.

  In another embodiment of the present invention, the electrical device includes a capacitor, one end of the relay bus bar is connected to a terminal of the capacitor, and the other end of the relay bus bar goes around the inner periphery of the case. And connected to the control unit.

  In another embodiment of the present invention, the electrical device includes a voltage conversion circuit, one end of the relay bus bar is connected to an output of the voltage conversion circuit, and the other end of the relay bus bar is connected to the case. It goes around the inner circumference and is connected to the controller.

  According to the present invention, it is possible to detect a collision by reliably detecting deformation of a case that houses an electric device such as an inverter due to an impact from an arbitrary direction. Further, since the relay bus bar that detects the collision functions as a voltage detection line, it is not necessary to separately provide a dedicated product for collision detection.

It is a system basic composition figure. It is arrangement position explanatory drawing of a collision detection apparatus. It is a top view which shows the internal structure of a case. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is arrangement | positioning explanatory drawing of a case. It is another arrangement explanatory view of a case. It is a block diagram of a relay bus bar. It is another block diagram of a relay bus bar. It is a top view which shows the other internal structure of a case. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a flowchart of a detection process. It is another flowchart of a detection process. It is a top view which shows other internal structure of a case. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view which shows other internal structure of a case. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is another flowchart of a detection process. It is a circuit block diagram of an inverter control board.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking a hybrid vehicle as an example. However, the present invention is not limited to a hybrid vehicle, and similarly applies to any vehicle that travels by driving a motor by controlling electric power from a battery with an electric device such as an inverter, such as an electric vehicle or a fuel cell vehicle. Applicable.

1. First, the overall system configuration will be described. The overall configuration of the system is the same as the system configuration described in Patent Document 1. FIG. 1 shows this system configuration.

  The system includes a traveling battery 220, a boost converter 242, an inverter 240, capacitors 510 and 520, system main relays SMRs 500, 504 and 506, a limiting resistor 502, and an ECU 400.

  Inverter 240 includes six IGBTs (Insulated Gate Bipolar Transistors) and six diodes connected in parallel to each IGBT so that a current flows from the emitter side to the collector side of the IGBT. Inverter 240 causes motor generator 140 to function as a motor or a generator based on a control signal from ECU 400. When the motor generator 140 functions as a motor, the inverter 240 turns on / off the gate of each IGBT, converts the DC power supplied from the traveling battery 220 into AC power, and supplies the AC power to the motor generator 140. When inverter 240 functions as motor generator, inverter 240 turns on / off the gate of each IGBT to convert AC power generated by motor generator 140 into DC power to charge traveling battery 220. The motor generator 140 includes a motor generator 140A and a motor generator 140B. When the motor generator 140A is for driving, the upper inverter 240 functions as a driving inverter, and when the motor generator 140B is for power generation. The lower inverter 240 functions as a power generation inverter.

  Boost converter 242 includes a reactor 311, transistors 312 and 313, and diodes 314 and 315. One end of the reactor 311 is connected to the power supply line of the traveling battery 220, and the other end is connected to an intermediate point between the transistor 312 and the transistor 313. The transistors 312 and 313 are connected in series between the positive electrode side line and the negative electrode side line of the inverter 240. The collector of the transistor 312 is connected to the positive line, and the emitter of the transistor 313 is connected to the negative line. In addition, diodes 314 and 315 that flow current from the emitter side to the collector side are connected between the collectors and emitters of the transistors 312 and 313. In boost converter 242, transistors 312 and 313 are turned on / off by ECU 400, and the DC voltage supplied from capacitor 510 is boosted and supplied to capacitor 520. Capacitor 520 smoothes the DC voltage supplied from boost converter 242 and supplies the smoothed DC power to inverter 240. Since both the capacitors 510 and 520 function as a smoothing capacitor, the capacitors 510 and 520 will be collectively referred to as a smoothing capacitor as appropriate below. Further, the positive line before being boosted by the boost converter 242 is referred to as a VL line for convenience, the positive line after being boosted by the boost converter 242 is referred to as a VH line, and the negative line is referred to as a VN line for convenience.

  ECU 400 controls inverter 240 and SMRs 500, 504, and 506 based on the ignition switch, the amount of depression of the accelerator pedal, the amount of depression of the brake pedal, the detected voltages of the VH and VL lines, and the like.

  Boost converter 242, smoothing capacitors (capacitors 510 and 520), inverter 240, and ECU 400 are housed in a case as a power control unit (PCU), and the case is housed in the engine room or below the rear floor. The inverter 240 is supplied with electric power obtained by further boosting a high voltage of about several hundred volts from the traveling battery 220 by the boost converter 242. Therefore, when the vehicle receives a significant impact due to a collision and the level of the impact exceeds the strength durability of the case, the case may be damaged, and high voltage power from the inverter 240 may leak depending on the degree of damage. . Therefore, in the present embodiment, ECU 400 quickly detects an impact caused by a collision, and executes a process of immediately stopping the operation of the high-pressure system.

  FIG. 2 shows the overall configuration of the collision detection circuit in this embodiment. The voltages on the VH, VL, and VN lines are respectively detected by voltage sensors and supplied to the ECU 400. The ECU 400 switches the SMRs 500, 504, 506 and the inverter 240 based on the inverter control board 400a including a voltage detection circuit (consisting of a conversion circuit that converts a high voltage into a low voltage) and the voltage detected by the voltage detection circuit. The inverter control board 400b includes a CPU that outputs a control signal for control. In the present embodiment, the relay circuit unit A for supplying the voltages of the VH, VL, and VN lines to the inverter control board 400a, or the relay circuit part B for supplying the detection voltage from the inverter control board 400a to the inverter control board 400b. The collision detection structure is applied to any of the above. The collision detection structure detects a deformation caused by an impact at the time of a collision of the smoothing capacitor or the case that houses the inverter 240, and detects the terminal voltage of the smoothing capacitor that occupies a large volume in the case to detect VH and VL. When detecting the voltage of the line, in the configuration in which the voltage detection line is connected to the inverter control board 400a or 400b via the relay bus bar, the relay bus bar is arranged to circulate along the inner peripheral surface of the case.

  Hereinafter, the details of the collision detection structure will be described separately for the case where the collision detection structure is arranged in the relay circuit unit A and the case where the collision detection structure is arranged in the relay circuit unit B.

2. Case of Arrangement in Relay Circuit Part A 2.1 First Configuration FIG. 3 is a plan view of the case 10 that houses the smoothing capacitor and the inverter 240. The case 10 has a flange 10a formed around the case 10 and accommodates the smoothing capacitor module 12. The smoothing capacitor module 12 includes capacitors 510 and 520 and a resin case 12b. The relay bus bar 16 is disposed in the resin case 12b. The relay bus bar 16 is configured by resin molding of a metal plate or a metal wire, and is disposed in the resin case 12b so as to surround the smoothing capacitor module 12 as shown in the drawing. Case 10 is connected to a body ground.

  4 shows an AA cross section in FIG. 3, and FIG. 5 shows a BB cross section in FIG. As shown in FIG. 4, the smoothing capacitor module 12 is provided with an electrode plate 12 a, and the electrode plate 12 a and the relay bus bar 16 are fastened with terminal fixing bolts 16. The terminal voltage of the smoothing capacitor module 12 is the terminal voltage of the capacitors 510 and 520, and is the voltage of the VH and VL lines. Since the electrode plate 12 a and the relay bus bar 16 are connected, the voltages on the VH and VL lines are output via the relay bus bar 16. The relay bus bar 16 is arranged around the smoothing capacitor module 12 as shown in FIG. The surface on which the relay bus bar 16 is disposed is substantially equal to the surface on which the flange 10a is formed. As shown in FIG. 5, the other end of the relay bus bar 16 is fastened to the voltage detection wire harness (W / H) 20 with a terminal fixing bolt 12c. The other end of the voltage detection wire harness 20 is connected to the inverter control board 400a.

  In FIG. 6, the vehicle mounting example of case 10 provided with such a relay bus bar 16 is shown. FIG. 6A is a plan view, and FIG. 6B is a side view. In the figure, the left direction indicates the front of the vehicle, and the right direction indicates the rear of the vehicle. A radiator support 21 is disposed in front of the case 10, and a side member is disposed on the side of the case 10. The flange 10a of the case 10 is formed in the horizontal direction. At the time of a collision from the front, the radiator support 21 collides with the flange 10a of the case 10 and gives an impact to the flange 10a. Moreover, also at the time of a collision from the side, the side member collides with the flange 10a of the case 10, and similarly gives an impact to the flange 10a.

  As described above, the surface on which the relay bus bar 16 is disposed is substantially the same as the surface on which the flange 10a is formed. Therefore, when an impact is applied to the flange 10a, the impact is also applied to the relay bus bar 16 accordingly. 16 is deformed and broken. Since the relay bus bar 16 is configured by resin-molding a metal plate or a metal wire, the internal metal plate or the metal wire is disconnected due to breakage of the relay bus bar 16 or becomes a body ground potential via the case 10. . The relay bus bar 16 is supplied to the inverter control board 400a as shown in FIG. 5 and further supplied to the CPU of the inverter control board 400b. Therefore, the CPU detects a voltage change of the relay bus bar 16 to generate a collision. Can be detected.

  FIG. 7 shows another arrangement of the case 10. FIG. 7A is a plan view and FIG. 7B is a side view. The flange 10a is formed in the vertical direction. Even in this case, at the time of a collision from the front, the radiator support 21 collides with the flange 10a of the case 10 and gives an impact to the flange 10a. Moreover, also at the time of a collision from the side, the side member collides with the flange 10a of the case 10, and similarly gives an impact to the flange 10a.

  As described above, in both cases of a collision from the front and a collision from the side, an impact is first applied to the flange 10a, whereby an impact is also applied to the relay bus bar 16 and the relay bus bar 16 is disconnected. Or, since a change to the potential of the body ground occurs, a collision from any direction can be detected.

  In this embodiment, since it is assumed that the relay bus bar 16 is disconnected due to an impact at the time of a collision, the relay bus bar 16 is preferably configured to be disconnected when an impact of a predetermined level or more is applied. FIG. 8 shows an example of the relay bus bar 16. A constricted portion 16a is periodically formed in the metal plate or the metal wire in the relay bus bar 16, and the strength is reduced in the constricted portion 16a, and the wire is easily disconnected.

  FIG. 9 shows another example of the relay bus bar 16. The metal plate or the metal wire in the relay bus bar 16 is periodically formed with openings 16b having a diameter smaller than the width of the metal plate or the metal wire, and the strength is lowered by these openings 16b and the wire is easily broken. It has become.

2.2 Second Configuration FIG. 10 shows another plan view of the case 10. 11 and 12 show the AA cross section and the BB cross section of FIG. 10, respectively.

  In the first configuration shown in FIGS. 3 to 5, the relay bus bar 16 is arranged in the resin case 12 b of the smoothing capacitor module 12. In the second configuration, the flange 10 a is surrounded so as to surround the smoothing capacitor module 12. It is arranged in a circle. That is, as shown in FIG. 11, the relay bus bar 16 is disposed so as to be sandwiched between the flanges 10a, and one end of the relay bus bar 16 is fastened to the electrode plate 12a of the smoothing capacitor module 12 by the terminal fixing bolt 12c. As shown in FIG. 12, the other end of the relay bus bar 16 is fastened to the voltage detection wire harness 20 by a terminal fixing bolt 12c.

  By arranging the relay bus bar 16 around the flange 10a, if the flange 10a receives an impact at the time of a collision, the relay bus bar 16 will be similarly impacted, and the CPU of the inverter control board 400b is affected by the voltage change of the relay bus bar 16. A collision can be detected.

2.3 Collision Detection Processing The basic configuration of the relay bus bar 16 in the case 10 has been described above. Next, detection processing in the CPU in the inverter control board 400b using the voltage of the relay bus bar 16 will be described.

(1) First Process FIG. 13 shows a flowchart of the collision detection process. First, the CPU acquires the voltages of the VH line and the VL line via the relay bus bar 16, and acquires the rotation speed (Rd) of the motor generator (MG) 140 (S101). The voltage on the VH line is the terminal voltage of the capacitor 520, and the voltage on the VL line is the terminal voltage of the capacitor 510. However, these voltages are converted from an actual voltage to a low voltage by the voltage conversion circuit of the inverter control board 400a and supplied to the CPU.

  Next, the CPU compares the acquired voltage value with the previously acquired voltage value and determines whether or not a change has occurred (S102). That is, the CPU calculates the magnitude (absolute value) of the difference between the previous value and the current value, and determines whether this exceeds a predetermined threshold, for example, 100 V in terms of actual voltage. The reason why the actual voltage is converted is that, as described above, the CPU is supplied with a value obtained by converting the actual voltage into a low voltage by the voltage conversion circuit. If it is determined that the difference between the previous value and the current value is equal to or smaller than the threshold value and there is no change, the processing after S101 is repeated assuming that no collision has occurred.

  On the other hand, when the magnitude of the difference between the previous value and the current value exceeds the threshold value, the CPU determines whether or not there is a change in the rotational speed of the motor generator (MG) (S103). This determination is made based on whether or not the magnitude of the difference between the previous value and the current value exceeds a predetermined threshold, for example, 200 rpm. When the magnitude of the difference between the previous value and the current value exceeds the threshold value, the CPU determines that sudden braking is applied due to a collision (S104), and determines that the relay bus bar 16 is disconnected due to the collision (S105). . Then, the CPU outputs a command to shut off the SMRs 500, 504, and 506 in order to stop the operation of the high voltage system (S106). At the same time, a command is output to inverter 240 to discharge the electric charge accumulated in the smoothing capacitor. Specifically, the inverter 240 is provided with a rapid discharge circuit composed of a relay and a discharge resistor Rd between the VH line and the VN line, and outputs a command to turn on the relay of the rapid discharge circuit. The electric charge accumulated in the smoothing capacitor is discharged.

  If the difference between the previous value and the current value is equal to or smaller than the threshold value in S103, the CPU determines that the voltage of the high voltage cable or the like has fluctuated due to a ground fault other than the collision (S107). In this case, the command for shutting off the SMRs 500, 504 and 506 triggered by the collision determination and the command for operating the rapid discharge circuit are not output (S108).

  In this processing, the fact that the voltage fluctuates due to the disconnection or ground fault of the relay bus bar 16 is used, but this can be easily realized using a differential amplifier. That is, the inverter control board 400a includes a voltage conversion circuit, which is constituted by a voltage dividing resistor and a differential amplifier. The non-inverting input terminal of the differential amplifier is supplied with the voltage of the VH line or VL line divided by the voltage dividing resistor, and the voltage of the VN line divided by the voltage dividing resistor is also supplied to the inverting input terminal. Is done. A predetermined voltage, for example, 5V, is supplied as a control voltage to the differential amplifier, and the output of the differential amplifier is supplied to the inverter control board 400b. When the relay bus bar 16 is operating normally, the output of the differential amplifier falls within, for example, 1V and 4V, but is fixed to the control voltage of 5V when the wire breaks (325V in terms of actual voltage). And the size of the difference from the normal time exceeds 100V). FIG. 22 shows an example of the circuit configuration of the inverter control board 400a.

(2) Second Process FIG. 14 shows another process flowchart of collision detection. The processing of S201 to S208 is the same as the processing of S101 to S108 shown in FIG. That is, first, the CPU acquires the voltages of the VH line and the VL line via the relay bus bar 16, and acquires the rotation speed (Rd) of the motor generator (MG) 140 (S201).

  Next, the CPU compares the acquired voltage value with the previously acquired voltage value and determines whether or not a change has occurred (S202). That is, the CPU calculates the magnitude (absolute value) of the difference between the previous value and the current value, and determines whether this exceeds a predetermined threshold, for example, 100 V in terms of actual voltage.

  When the magnitude of the difference between the previous value and the current value exceeds the threshold value, the CPU determines whether or not there is a change in the rotational speed of the motor generator (MG) (S203). This determination is made based on whether or not the magnitude of the difference between the previous value and the current value exceeds a predetermined threshold, for example, 200 rpm. When the magnitude of the difference between the previous value and the current value exceeds the threshold, the CPU determines that sudden braking is applied due to a collision (S204), and determines that the relay bus bar 16 is disconnected due to the collision (S205). . Then, the CPU outputs a command for shutting off the SMRs 500, 504, and 506 in order to stop the operation of the high voltage system (S206). At the same time, a command is output to inverter 240 to discharge the electric charge accumulated in the smoothing capacitor. That is, the relay of the rapid discharge circuit is instructed to be turned on, and the charge accumulated in the smoothing capacitor is discharged by the discharge resistor Rd.

  If the difference between the previous value and the current value is equal to or smaller than the threshold value in S203, the CPU determines that the voltage of the high voltage cable or the like has fluctuated due to a ground fault other than the collision (S207). In this case, a command for shutting off the SMRs 500, 504, and 506 triggered by the collision determination and a command for operating the rapid discharge circuit are not output (S208).

  On the other hand, the processing when the magnitude of the difference between the previous value and the current value is equal to or smaller than the threshold value in S202 is different from FIG. That is, the CPU holds the acquired current value in the memory (S209). Then, the voltage of the VH line and the VL line (this is set as the P side) is read (S210), and the voltage of the VN line (this is set as the N side) is acquired (S211). Similarly to the voltage detection of the VH and VL lines, the voltage of the VN line may be detected by connecting the relay bus bar 16 to the VN line side electrode plate of the smoothing capacitor. Then, the CPU calculates the magnitude of the difference between the P-side voltage and the N-side voltage, and determines whether or not the magnitude of the difference exceeds a predetermined threshold, for example, 50 V in terms of actual voltage (S212). If it is below the threshold value, the processing from S201 onward is repeated. If the threshold value is exceeded, it is determined whether there is a change in the rotational speed of motor generator 140 as in S203 (S213). If there is a change in the rotational speed, it is determined that sudden braking has been applied due to the collision as in S204 due to the collision (S214). It is determined that the potential has been reached (S215). And since it determined with a collision, CPU outputs the command which interrupts | blocks SMR500,504,506 (S206). In addition, a command is output to inverter 240 to discharge the charge accumulated in the smoothing capacitor. That is, the relay of the rapid discharge circuit is instructed to be turned on, and the charge accumulated in the smoothing capacitor is discharged by the discharge resistor Rd.

  In this process, it is determined that the relay bus bar 16 is disconnected due to a collision in S205, but it should be noted that it is determined that the relay bus bar 16 is grounded in S215. This is because, when either the VH line or the VN line (or the VL line or the VN line) is grounded, the magnitude of the difference may not exceed a threshold value (for example, 100 V in terms of actual voltage) This is based on the fact that if one of them is grounded, the voltage difference between the VH line and the VN line exceeds a certain threshold value (50 V in terms of actual voltage). In the flowchart of FIG. 13, if either the VH line or the VN line (or the VL line or the VN line) is grounded, it is determined NO in S102 and thus cannot be detected. Any ground fault can be detected by adding the process of S212, and therefore a ground fault occurs even if it does not reach disconnection, or when the disconnection occurs, the detection line touches the case and a ground fault occurs. The occurrence of a collision as a cause of the ground fault can be detected.

  If it is determined in S213 that there is no change in the rotational speed, the CPU determines that the voltage has fluctuated due to a ground fault in a high-voltage cable or the like other than the collision as in S207. In this case, since no collision has occurred, a command for shutting off the SMRs 500, 504, and 506 and a command for operating the rapid discharge circuit are not output (S208).

3. 3.1 Case of Arrangement in Relay Circuit Unit B FIGS. 15 to 17 show the configuration of case 10 when a collision detection device is arranged in relay circuit B. FIG. 15 is a plan view of the case 10, and FIGS. 16 and 17 are cross-sectional views taken along lines AA and BB, respectively, of FIG. One end of the relay bus bar 16 is fastened with a terminal fixing bolt 30 to an inverter control board 400a including a voltage conversion circuit as shown in FIG. The relay bus bar 16 is arranged on the resin case 12b of the smoothing capacitor module 12 so as to surround the periphery of the smoothing capacitor module 12 as in FIG. Further, the other end of the relay bus bar 16 is fastened to the wire harness 22 on the inverter control board 400a by the terminal fixing bolt 30 as shown in FIG. The other end of the wire harness 22 is fastened to the inverter control board 400b with the terminal fixing bolt 32. Since the surface on which the relay bus bar 16 is disposed is substantially equal to the surface on which the flange 10a is formed, when an impact is applied to the flange 10a, the impact is also applied to the relay bus bar 16 and the relay bus bar 16 is deformed and damaged. To do. Since the relay bus bar 16 is configured by resin-molding a metal plate or a metal wire, the internal metal plate or the metal wire is disconnected due to breakage of the relay bus bar 16 or becomes a body ground potential via the case 10. . Since the relay bus bar 16 is connected to the inverter control board 400b, the CPU can detect the occurrence of a collision by detecting a voltage change of the relay bus bar 16.

3.2 Second Configuration FIGS. 18 to 20 show other configurations of the case 10 when the collision detection device is arranged in the relay circuit B. FIG. 18 is a plan view of the case 10, and FIGS. 19 and 20 are AA and BB sectional views of FIG. 18, respectively. As shown in FIG. 19, one end of the relay bus bar 16 is fastened to one end of the wire harness 22 with a terminal fixing bolt 30, and the other end of the wire harness 22 is fastened to the inverter control board 400 a including the voltage conversion circuit with the terminal fixing bolt 30. Is done. The relay bus bar 16 is disposed in the flange 10a so as to surround the smoothing capacitor module 12 as in FIG. Further, the other end of the relay bus bar 16 is connected to the inverter control board 400b via the wire harness 22 by a terminal fixing bolt 30 as shown in FIG. Since the relay bus bar 16 is disposed in the flange 10a, when an impact is applied to the flange 10a, the impact is also applied to the relay bus bar 16, and the relay bus bar 16 is deformed and damaged. Since the relay bus bar 16 is configured by resin-molding a metal plate or a metal wire, the internal metal plate or the metal wire is disconnected due to breakage of the relay bus bar 16 or becomes a body ground potential via the case 10. . Since the relay bus bar 16 is connected to the inverter control board 400b, the CPU can detect the occurrence of a collision by detecting a voltage change of the relay bus bar 16.

3.3 Collision Detection Processing Next, detection processing in the CPU of the inverter control board 400b will be described.

  FIG. 21 shows a flowchart of the collision detection process. First, the CPU acquires the voltages of the VH and VL lines (S301). Then, it is determined whether or not the acquired voltage value is within a predetermined range, for example, within a range of 1V to 4V (S302). If the acquired voltage value is within a predetermined range, it is assumed that the voltage value is normal, and the processes after S301 are repeated.

  On the other hand, when the acquired voltage value is not within the predetermined range, it is determined that a collision has occurred. Specifically, when the voltage value is 0 V, it is determined that the relay bus bar 16 has a ground fault due to a collision. If the voltage value is 5V, it is determined that the relay bus bar 16 is disconnected due to a collision (S303). And the command which interrupts SMR500,504,506 is output (S304). At the same time, the CPU may output a command to the inverter 240 so as to discharge the charge accumulated in the smoothing capacitor.

  As described above, by disposing the collision detection device in one of the relay circuits A and B, it is possible to detect a collision and quickly stop the operation of the high-pressure system. In the present embodiment, a collision is detected using the relay bus bar 16 for detecting the voltage of the smoothing capacitor and supplying it to the inverter control board 400a or 400b. In other words, the relay bus bar as a voltage detection line is used for collision detection. Therefore, it is not necessary to provide a conductor film or the like in the case 10 separately from the voltage detection line.

  10 cases, 140 motor generator, 220 battery for running, 240 inverter, 242 boost converter, 400 ECU, 510, 520 condenser (smoothing condenser).

Claims (2)

A vehicle collision detection device comprising:
Electrical equipment,
A case for housing the electrical device;
A relay bus bar that is electrically connected to a terminal of the electrical device and is arranged to circulate the inner periphery of the case;
A controller that is connected to the relay bus bar, monitors the voltage of the electrical device using the relay bus bar as a voltage detection line, and detects a collision by detecting a voltage change of the relay bus bar;
Equipped with a,
The case is provided with a flange so as to protrude outward from the case,
The vehicle collision detection device , wherein the relay bus bar is disposed in the flange . A vehicle collision detection device comprising:
Electrical equipment,
A case for housing the electrical device;
A relay bus bar that is electrically connected to a terminal of the electrical device and is arranged to circulate the inner periphery of the case;
A controller that is connected to the relay bus bar, monitors the voltage of the electrical device using the relay bus bar as a voltage detection line, and detects a collision by detecting a voltage change of the relay bus bar;
With
The case is provided with a flange so as to protrude outward from the case,
The vehicular collision detection device , wherein the relay bus bar is disposed on an inner periphery of the case and substantially the same surface as the surface on which the flange is formed .

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