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Fault processing method of traction driving system and electric vehicle

A fault handling method and traction drive technology, applied in the field of vehicles, can solve problems such as secondary failure of the traction drive system

Active Publication Date: 2021-05-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In related technologies, when the motor controller detects a failure in the traction drive system, it generally adopts a three-phase short circuit method for the motor. The drive system is prone to secondary failures

Method used

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  • Fault processing method of traction driving system and electric vehicle
  • Fault processing method of traction driving system and electric vehicle
  • Fault processing method of traction driving system and electric vehicle

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Embodiment Construction

[0025] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] The inventors of the present invention found through research and analysis that the motor and its motor controller are key components of the traction drive system of an electric vehicle, and whether it works normally is closely related to the performance and driving safety of the vehicle.

[0027] When the traction drive system fails, a three-phase short circuit is generally used for the motor. However, if the working status of the power switching device in the motor controller is not detected, a three-phase short circuit is used. Once the power switching device fa...

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PUM

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Abstract

The invention provides a fault processing method of a traction driving system and the traction driving system. The traction driving system comprises a motor controller and a motor, and the method comprises the steps of obtaining fault state information of the traction driving system; obtaining a direct current end bus voltage of the motor controller; determining whether the motor enters a short-circuit mode or an idling mode based on the direct current end bus voltage and the fault state information; when it is determined that the motor enters the short-circuit mode, obtaining the state information of all power switch devices in the motor controller, and the state information of the power switch devices being used for reflecting whether each power switch device breaks down or not; and according to the state information of the power switch devices, controlling the power switch devices to execute corresponding operations, so that the motor works in the short-circuit mode. When the traction driving system breaks down, the motor can be in a safe state.

Description

technical field [0001] The invention belongs to the field of vehicles, and in particular relates to a fault handling method of a traction drive system and an electric vehicle. Background technique [0002] As the key traction drive system components of electric vehicles, the motor and its motor controller are closely related to the performance and driving safety of the vehicle. In related technologies, when the motor controller detects a failure in the traction drive system, it generally adopts a three-phase short circuit method for the motor. The drive system is prone to the problem of secondary failure. Contents of the invention [0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. [0004] Therefore, the first object of the present invention is to propose a method for troubleshooting a traction drive system. When the traction drive system fails, the method can determine the operation mode of the mo...

Claims

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Application Information

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IPC IPC(8): B60L3/00
CPCB60L3/0084Y02T10/72
Inventor 徐鲁辉李小为任少朋
Owner BYD CO LTD
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