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Electric leakage detection device for in-vehicle power supply system, and hydraulic shovel

A hydraulic excavator, power supply technology, applied in the direction of electrical devices, measuring devices, measuring current/voltage, etc., to achieve the effect of cheap circuit structure

Inactive Publication Date: 2016-09-21
KOMATSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] On the other hand, when there is a leakage in the power supply system 10, that is, in the case of a leakage in the negative wire 14, a leakage resistance r is generated between the negative wire 14 and the main body (ground) of the vehicle body.

Method used

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  • Electric leakage detection device for in-vehicle power supply system, and hydraulic shovel
  • Electric leakage detection device for in-vehicle power supply system, and hydraulic shovel
  • Electric leakage detection device for in-vehicle power supply system, and hydraulic shovel

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Embodiment Construction

[0051] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0052] figure 1 It is a figure which shows the structure of embodiment. exist figure 1 Among them, the leakage detection device of the vehicle-mounted power supply system includes a power supply system 10 and a leakage detection device 30 .

[0053] figure 1 The power supply system 10 shown, except that the contactor 17b is not provided on the negative wire 14, is similar to that used Figure 4 The illustrated power supply system 10 is substantially the same. In this embodiment, a contactor may also be provided on the negative electric wire 14, but it is necessary to turn on any one of the contactors provided on the positive electric wire and the negative electric wire during the leakage detection process in this embodiment.

[0054] The power supply system 10 is composed of a DC high voltage circuit A and an AC high voltage circuit B. The DC high voltage circui...

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Abstract

An electric leakage detection device for an in-vehicle power supply system includes: a detection signal generation unit for applying an AC voltage to a voltage application point on a wire connecting a power conversion circuit and a power supply, said power conversion circuit converting the power from the power supply to AC power and supplying the AC power to an electric motor; a voltage measurement unit for measuring the voltage at a voltage measurement point between said detection signal generation unit and said voltage application point; and an electric leakage detection unit for detecting, when a control device for said electric motor is providing said electric motor with an instruction for holding a constant rotation angle, whether or not electric leakage is present between said power conversion circuit and said electric motor depending on the voltage at said voltage measurement point measured by said voltage measurement unit.

Description

technical field [0001] The present invention relates to a leakage detection device and a hydraulic excavator of an on-vehicle power supply system that converts DC power of a storage battery into AC power by a power conversion circuit and supplies the AC power to an AC motor. Background technique [0002] In recent years, the development of vehicles such as hybrid vehicles in which part or all of the power is replaced by electric power supplied from a storage battery has been advanced. Such vehicles are often equipped with a power supply system that converts DC power of a battery into AC power using a power conversion circuit such as an inverter, and supplies the AC power to a load such as an AC motor. [0003] The storage battery used in the power supply system has a high voltage and a large capacity, so if a leakage occurs somewhere in the circuit, it may hinder the maintenance work of the vehicle. Therefore, in the vehicle-mounted electric power supply system, it is neces...

Claims

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Application Information

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IPC IPC(8): G01R31/02E02F9/12E02F9/20
CPCE02F9/123E02F9/2091E02F9/2095G01R31/007H02P27/06H02M7/48E02F9/2075H02H3/16H02H7/08H02P29/0241G01R31/42E02F9/2004E02F9/267G01R31/52B60L50/60H02J2310/48Y02T10/64Y02T10/70H02M1/123H02J7/0013H02J7/0048G01R19/16576G01R31/50B60L3/0061B60L2210/40H02M7/537H02P6/14
Inventor 山田健太郎川路泰史
Owner KOMATSU LTD
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