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Contactor fault detection device and method and vehicle

A fault detection and contactor technology, applied in measuring devices, circuit breaker testing, instruments, etc., can solve problems such as failure to detect faults in main and negative contactors, missing contactor failures, affecting battery and vehicle safety, etc.

Inactive Publication Date: 2020-09-08
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used contactor diagnosis method is to detect the current and voltage of the contactor coil to determine whether there is a fault in the contactor. The method cannot detect the fault of the main and negative contactors, resulting in the possibility of missing contactor faults and affecting the safety of the battery and the vehicle

Method used

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  • Contactor fault detection device and method and vehicle
  • Contactor fault detection device and method and vehicle
  • Contactor fault detection device and method and vehicle

Examples

Experimental program
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Effect test

Embodiment 1

[0029] figure 1 A structural diagram of a contactor fault detection device provided in Embodiment 1 of the present invention, the device is used for fault detection of a contactor in a high-voltage load circuit, such as figure 1 As shown, the device includes: a voltage sampling module 110 , a voltage dividing module 120 and a control module 130 ; the voltage sampling module 110 and the voltage dividing module 120 are respectively connected to the control module 130 .

[0030] The high-voltage load circuit 140 includes: a pre-charging resistor 141, a pre-charging contactor 142, a main positive contactor 143, a power battery 144, a main negative contactor 145, and a load device 146; the first end of the pre-charging resistor 141 is connected to the The first end of the load device 146 is connected to the first end of the main positive contactor 143, the second end of the pre-charging resistor 141 is connected to the first end of the pre-charging contactor 142, and the pre-chargi...

Embodiment 2

[0044] figure 2 It is a flow chart of a contactor fault detection method provided in Embodiment 2 of the present invention. The method is executed by the control module in any contactor fault detection device provided in the embodiment of the present invention. The method includes the following steps:

[0045] Step 201, after receiving a power-on instruction, control the voltage dividing module to close.

[0046] In this embodiment, the power-on instruction can be specifically understood as an instruction for instructing the power battery to supply power to other devices in the vehicle, and the voltage dividing module can be specifically understood as a circuit device that can realize the voltage dividing function, and is used to control the power of the power battery. The voltage at the terminal is divided, such as a circuit composed of a relay and a resistor.

[0047] Specifically, the triggering mode of the power-on instruction may be triggered by switching the ignition s...

Embodiment 3

[0103] Figure 4 It is a flow chart of a contactor fault detection method provided by the embodiment of the present invention. The technical solution of this embodiment is further refined on the basis of the above technical solution, and specifically mainly includes the following steps:

[0104] Step 401 , control the current collection module to feed back the collected current information according to the set second time interval, and determine the current state of each contactor.

[0105] In this embodiment, the second time interval can be specifically understood as a current collection period preset according to actual needs, such as 0.1s; the current information can be specifically understood as the current value of each device in the high-voltage load circuit, and the current information includes the main positive contact current information of the contactor coil, main negative contactor coil current information and / or pre-charging contactor coil current information; the ...

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PUM

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Abstract

The embodiment of the invention discloses a contactor fault detection device and method and a vehicle. The device comprises a voltage sampling module, a voltage division module and a control module. The voltage sampling module and the voltage division module are respectively connected with the control module; the voltage sampling module is used for collecting voltages at two ends of a power battery and a main positive contactor, voltages at two ends of a main negative contactor and voltages at two ends of the power battery; the collected voltages are fed back to the control module; the controlmodule is used for performing fault detection on a contactor in a high-voltage load circuit by controlling the on-off of the voltage division module according to the voltage acquired by the voltage sampling module. Therefore, a problem that fault detection cannot be carried out on a main negative contactor due to the fact that voltage at two ends is zero when the main negative contactor is disconnected and connected in a high-voltage load circuit is solved. The problem of failure missed alarm of the contactor is solved, the driving safety is improved, the failure diagnosis of the contactor inthe high-voltage load circuit can be realized by matching a simple circuit with the voltage sampling module, and the cost is saved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of vehicle control, in particular to a contactor fault detection device, method and vehicle. Background technique [0002] With the improvement of living standards and awareness of energy conservation and emission reduction, more and more people choose electric vehicles as a travel tool. The driving of electric vehicles and the normal operation of the entire vehicle can only be completed by the power provided by the power battery. In electric vehicles, when the power battery supplies power to the high-voltage system of the vehicle, the contactor is used to control the on-off of the battery and the high-voltage system of the vehicle, so the fault diagnosis of the contactor is particularly important. [0003] At present, the commonly used contactor diagnosis method is to detect the current and voltage of the contactor coil to determine whether there is a fault in the contactor. The m...

Claims

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Application Information

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IPC IPC(8): G01R31/327
CPCG01R31/3275
Inventor 齐睿刘轶鑫荣常如马腾翔许立超
Owner CHINA FIRST AUTOMOBILE