JP2013052810A - vehicle - Google Patents

Abstract

An object of the present invention is to determine well that a ground wire is not connected to a case mounted on a vehicle body via a mounting member that houses an electrical device and has electrical insulation properties.
In a hybrid vehicle, a PCU case 45 that accommodates a DC / DC converter 44 as an electric device that outputs electric power via an output line 53 is supported by the vehicle body 11 via a mount member 15 having electrical insulation. The ground wire 55 mounted on the transaxle case 25 for electrically connecting the PCU case 45 and the vehicle body 11 has a case-side terminal 55a connected to the PCU case 45 at one end, and the case. The other end side of the side terminal 55a is bound to the output line 53 of the DC / DC converter 44.
[Selection] Figure 3

Description

  The present invention relates to a vehicle having an electric device and a case that is mounted on a vehicle body via a mount member that houses the electric device and has electrical insulation properties.

  Conventionally, as a power supply device for a vehicle, a battery for traveling, a monitoring control circuit that monitors and controls the battery for traveling while being connected to an electric battery via a power supply line, and a battery for traveling and a monitoring control circuit are housed In addition, a battery case that is connected to the chassis ground of the vehicle via an earth line (ground line) and a connection state detection circuit that detects a connection state of the earth line is known (for example, a patent) Reference 1). This connection state detection circuit of the power supply device is configured so that the bias voltage of the semiconductor switching element is changed depending on whether the ground wire is connected to the chassis ground or not. Connection failure of the ground wire is detected by switching the element on and off.

JP 2010-54468 A

  If the connection state detection circuit as described above is mounted on a vehicle, a connection failure of the ground line can be detected. However, since a large number of electric devices are mounted on the vehicle, providing a connection state detection circuit for each electric device and case increases the cost. On the other hand, even if the ground wire is not connected to the case that accommodates the electric device, depending on the configuration of the vehicle, the type of the electric device, etc., the vehicle ( The engine may start and run. However, in such a case, there is a possibility that some adverse effect may be exerted on the vehicle side after a while after the vehicle is started or after running.

  Therefore, the present invention mainly enables low-cost and good discrimination that a ground wire is not connected to a case mounted on a vehicle body via a mount member having electrical insulation properties while accommodating an electrical device. Objective.

  The vehicle according to the present invention employs the following means in order to achieve the main object.

The vehicle according to the present invention is
In a vehicle having an electrical device, a case that accommodates the electrical device and is mounted on a vehicle body via a mount member having electrical insulation, and a ground wire for electrically connecting the case and the vehicle body ,
The ground wire has a case-side terminal connected to the case at one end, and is bound to an output line of the electric device at the other end side than the case-side terminal.

  In this vehicle, the ground wire for electrically connecting the case housing the electric device and the vehicle body is bound to the output line of the electric device on the other end side than the case side terminal on one end side connected to the case. ing. In this way, if the ground wire and the output line of the electric device are bound (assembled), for example, when assembling or inspecting the electric device and the case, the case side terminal of the case and the ground wire When is not connected, the portion on the case side terminal side hangs down from the output line with respect to the bundling portion of the ground line with the output line. Therefore, when the vehicle is started or travel is started in this state, the case side terminal side portion of the ground wire flutters or the case side terminal etc. An abnormal noise is generated by hitting the member. As a result, in this vehicle, it is possible to determine at low cost and satisfactorily that the ground line is not connected to the case that houses the electric device from the abnormal noise generated around the ground line.

  Note that the electrical device may output current via an output line. The electric device may be a voltage converter that steps down power from a high voltage system including a high voltage battery and supplies the low voltage system including a low voltage battery and connected to an auxiliary machine. Furthermore, the case may be mounted on an engine or a transaxle mounted on the vehicle body via a mount member having electrical insulation, for example. The vehicle according to the present invention may be a hybrid vehicle or an electric vehicle including an electric motor capable of exchanging electric power with a high voltage battery, or may be a vehicle including only an engine as a power generation source for traveling.

1 is a schematic configuration diagram showing a hybrid vehicle 10 which is an example of a vehicle according to the present invention. 1 is an explanatory diagram showing a main part of a hybrid vehicle 10. FIG. 1 is an explanatory diagram showing a main part of a hybrid vehicle 10. FIG.

  Next, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing a hybrid vehicle 10 which is an example of a vehicle according to the present invention. A hybrid vehicle 10 shown in FIG. 1 includes an engine (internal combustion engine) 12 that outputs power using a hydrocarbon-based fuel such as gasoline or light oil, and a transaxle 21 that constitutes a power output device 20 together with the engine 12. . As shown in the drawing, the engine 12 and the transaxle 21 are mounted on the vehicle body (monocoque) 11 via an insulating mount member 15.

  The transaxle 21 includes a damper 22 connected to the crankshaft 14 of the engine 12, a single pinion planetary gear 30, a motor MG1 that mainly operates as a generator, a motor MG2 that inputs and outputs power to the drive shaft 23, A differential gear 24 connected to a wheel DW, which is a driving wheel, via a drive shaft, a transaxle case 25 that accommodates these components, and the like are included. Planetary gear 30 supports sun gear (first element) 31 connected to the rotor of motor MG1, ring gear (second element) 32 connected to drive shaft 23, and a plurality of pinion gears 33, and via damper 22 And a planetary carrier (third element) 34 connected to the crankshaft 14 of the engine 12. The rotor of the motor MG2 is connected to the drive shaft 23 (ring gear 32) via a transmission 26 housed in the transaxle case 25. Further, the drive shaft 23 is connected to the differential gear 24 via a gear mechanism 27 accommodated in the transaxle case 25.

  Hybrid vehicle 10 also supplies electric power to motors MG1 and MG2 via inverter 41 that drives motor MG1, inverter 42 that drives motor MG1, high-voltage power line 52 including positive and negative buses, and inverters 41 and 42. A high voltage battery 50 capable of exchange. The inverters 41 and 42, the high voltage battery 50, the high voltage power line 52, and the like constitute a high voltage system of the hybrid vehicle 10. The high voltage battery 50 is, for example, a nickel metal hydride secondary battery or a lithium ion secondary battery having a rated output voltage of 200 to 300V.

  Further, a DC / DC converter 44 as an electric device is connected to the high voltage power line 52, and the DC / DC converter 44 includes a low voltage battery (auxiliary battery) 51 and is connected to the auxiliary machine 60. A low voltage system is connected. Each of the DC / DC converters 44 includes a switching element, a transformer, and the like (not shown), and lowers the power from the high voltage system (high voltage power line 52) including the high voltage battery 50 by turning on and off the switching element. That is, it can be supplied to the low voltage battery 51 and the auxiliary machine 60. The low voltage battery 51 is a lead storage battery having a rated output voltage of, for example, 12V. In addition, the auxiliary machine 60 includes a plurality of devices such as a headlight, a room lamp, and a car audio (not shown). The low voltage battery 51 also supplies power to various electronic control units (not shown).

  In the present embodiment, as shown in FIGS. 1 and 2, the DC / DC converter 44 is a power control made of a conductive material together with high-voltage electrical equipment that constitutes a high-voltage system such as inverters 41 and 42 and a boost converter (not shown). It is accommodated in a unit case (hereinafter referred to as “PCU case”) 45. The PCU case 45 is mounted (fixed) on the upper part of the transaxle case 25. As shown in FIG. 2, the output line 53 of the DC / DC converter 44 is connected to the positive terminal 51 a of the low-voltage battery 51, and the positive terminal 51 a is connected to the auxiliary machine 60 via the low-voltage power line 54. .

  Furthermore, the case side terminal 55 a of the ground line 55 is electrically connected to the PCU case 45, and the other end of the ground line 55 is connected to the negative terminal 51 b of the low voltage battery 51. The negative terminal 51 b of the low-voltage battery 51 is connected to the vehicle body 11 via the ground wire 56, whereby the PCU case 45 is electrically connected to the vehicle body 11 via the ground wire 55 and the ground wire 56. . In addition, since the transaxle case 25 that supports the PCU case 45 is electrically insulated from the vehicle body 11 by the mount member 15, the ground (secondary side) of the DC / DC converter 44 is electrically connected to the PCU case 45. Connected to. Thereby, the ground on the output side of the DC / DC converter 44 is electrically connected to the vehicle body 11 via the PCU case 45, the ground wire 55, and the ground wire 56.

  Here, the hybrid vehicle 10 configured as described above basically starts with the power from the motor MG2 driven by the power from the high-voltage battery 50. Further, when starting the engine 12 while the hybrid vehicle 10 is stopped, the engine 12 is cranked by the motor MG1 driven by the electric power from the high voltage battery 50. Furthermore, if the auxiliary machine 60 can be supplied with electric power from the low voltage battery 51 and the output line 53 is properly connected, for example, when the PCU case 45 is assembled or when the hybrid vehicle 10 is inspected and maintained. Even if the case side terminal 55 a of the ground wire 55 is not connected to the PCU case 45, power can be supplied from the DC / DC converter 44 to the auxiliary device 60. Therefore, even if the case side terminal 55a of the ground line 55 is not connected to the PCU case 45, the hybrid vehicle 10 can be started, or the engine 12 can be started while the hybrid vehicle 10 is stopped.

  However, the shield wire of the power cable of the high-voltage electrical device is electrically connected to the PCU case 45, and the ground wire 55 is connected to the PCU case 45 even though the output wire 53 is properly connected. When the hybrid vehicle 10 starts running or the engine 12 is started while the side terminal 55a is not connected, a relatively high current flows from the PCU case 45 to the shield wire of the power cable of the high-voltage electrical equipment. Will flow. Therefore, it is not preferable to continue the state where the case side terminal 55a of the ground wire 55 is not connected to the PCU case 45 for a long time.

  Based on this, in the hybrid vehicle 10 of the present embodiment, as shown in FIG. 2, the ground wire 55 is a binding member such as a tube or a tape on the other end side (low voltage battery 51 side) than the case side terminal 55a on one end side. 57 is bound to the output line 53 of the DC / DC converter 44. Thereby, when the PCU case 45 and the case side terminal 55a of the ground wire 55 are not connected, as shown in FIG. 3, the case side of the binding member 57 (the binding portion with the output line 53) of the ground wire 55. The portion on the terminal 55a side hangs down from the output line 53 with the end of the binding member 57 as a base point. In the present embodiment, the length from the case side terminal 55a to the end portion of the binding member 57 is such that the case side terminal 55a hanging from the output line 53 with the end portion of the binding member 57 as a base point does not rest on another member. , Determined to be floating in the air.

  Thus, if the ground line 55 and the output line 53 of the DC / DC converter 44 are bundled (assumed as an assembly), for example, when the PCU case 45 is assembled or when the hybrid vehicle 10 is inspected and maintained. If the PCU case 45 and the case side terminal 55a of the ground wire 55 are not connected and the hybrid vehicle 10 starts running in such a state or the engine 12 is started while the vehicle is stopped or the like, Due to vibration of the vehicle body 11, the case side terminal 55 a side portion of the ground wire 55 flutters, or the case side terminal 55 a etc. hits peripheral members such as the PCU case 45 and the transaxle case 25. An abnormal noise occurs. As a result, in the hybrid vehicle 10, it is possible to satisfactorily determine that the ground line 55 is not connected to the PCU case 45 that houses the DC / DC converter 44 from abnormal noise generated around the ground line 55. If abnormal noise occurs around the ground wire 55 during the trial run after the PCU case 45 is assembled or the trial run after the inspection and maintenance of the hybrid vehicle 10, the case side terminal 55a of the PCU case 45 and the ground wire 55 is used. If the PCU case 45 and the ground line 55 are not connected, both can be connected.

  As described above, in the hybrid vehicle 10 of the present embodiment, the PCU case 45 that houses the DC / DC converter 44 as an electric device that outputs electric power via the output line 53 has the mount member 15 having electrical insulation. It is mounted on the vehicle body 11 via. The ground wire 55 for electrically connecting the PCU case 45 and the vehicle body 11 has a case side terminal 55a connected to the PCU case 45 at one end and the other end side from the case side terminal 55a. Thus, the output line 53 of the DC / DC converter 44 is bound. In this way, if the ground line 55 and the output line 53 of the DC / DC converter 44 are bound (assembled), the PCU case 45 and the case side terminal 55a of the ground line 55 are not connected. When the hybrid vehicle 10 starts running in the state or the engine 12 is started while the vehicle is stopped or the like, the portion of the ground wire 55 on the case side terminal 55a side caused by running vibration, vibration of the engine 12 or the vehicle body 11, etc. It is possible to satisfactorily determine that the ground line 55 is not connected to the PCU case 45 from abnormal noise generated due to the contact between the case terminal 55a and the peripheral members. According to the configuration as described above, a detection circuit or the like for detecting that the ground line 55 is not connected to the PCU case 45 is not necessary, and thus the cost increase of the hybrid vehicle 10 can be suppressed. it can.

  The hybrid vehicle 10 described above includes a so-called two-motor type power output device 20, but the present invention travels only on a hybrid vehicle including a so-called one-motor type power output device, an electric vehicle, or even an engine. Needless to say, the present invention can also be applied to a vehicle including a power generation source. In the present invention, the electric device is not limited to the DC / DC converter, and is mounted on the vehicle body via a mount member having electrical insulation and is electrically connected to the vehicle body via a ground wire. Anything can be used as long as it can be accommodated in the case.

  Here, the correspondence between the main elements in the embodiment and the main elements of the invention described in the column of means for solving the problem is described in the column of means for the embodiment to solve the problem. The embodiment for carrying out the invention is an example for specifically explaining the embodiment, and does not limit the elements of the invention described in the column of means for solving the problem. That is, the above embodiment is merely a specific example of the invention described in the section for solving the problem, and the interpretation of the invention described in the section for solving the problem is not limited to that section. This should be done based on the description.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention. .

  The present invention can be used in the vehicle manufacturing industry.

  DESCRIPTION OF SYMBOLS 10 Hybrid vehicle, 11 Car body, 12 Engine, 14 Crankshaft, 15 Mount member, 20 Power output device, 21 Transaxle, 22 Damper, 23 Drive shaft, 24 Differential gear, 25 Transaxle case, 26 Transmission, 27 Gear mechanism , 30 planetary gear, 31 sun gear, 32 ring gear, 33 pinion gear, 34 planetary carrier, 41, 42 inverter, 44 DC / DC converter, 45 PCU case, 50 high voltage battery, 51 low voltage battery, 51a positive terminal, 51b negative terminal, 52 high voltage Power line, 53 output line, 54 low voltage power line, 55 ground line, 55a case side terminal, 56 ground line, 57 binding member, 60 auxiliary machine, DW drive wheel, MG1, MG2 motor.

Claims (1)

In a vehicle having an electrical device, a case that accommodates the electrical device and is mounted on a vehicle body via a mount member having electrical insulation, and a ground wire for electrically connecting the case and the vehicle body ,
The ground wire has a case side terminal connected to the case at one end, and is bound to an output line of the electric device at the other end side than the case side terminal.

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