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Motor controller high voltage bus capacitance discharging method

A technology of motor controller and high-voltage busbar, which is used in the control of driving, electric vehicles, transportation and packaging, etc., can solve problems such as safety accidents, and achieve the effect of improving safety and reliability.

Active Publication Date: 2015-07-15
CHERY AUTOMOBILE CO LTD
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AI Technical Summary

Problems solved by technology

[0004] The motor drive system in the new energy vehicle is a part of the vehicle power system or a single power system. When the vehicle stops working and the high-voltage relay is disconnected, the motor controller bus capacitor still has a certain amount of residual charge. This part of the residual charge needs to be It takes a long time to fully discharge, and safety accidents may occur during operations such as vehicle maintenance or cleaning

Method used

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  • Motor controller high voltage bus capacitance discharging method
  • Motor controller high voltage bus capacitance discharging method
  • Motor controller high voltage bus capacitance discharging method

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Embodiment Construction

[0031] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

[0032] New energy vehicle motor controller high-voltage bus capacitor residual charge discharge strategy based on figure 1 The d-axis current i in d load curve and figure 2 To implement the active release strategy in , the specific implementation method is as follows:

[0033] The counter t1 is initialized to 0 when the vehicle is powered on normally, and the active discharge strategy does not work;

[0034] When the key switch of the vehicle is turned off and the high voltage relay of the vehicle is disconnected, the motor controller enters the active discharge program.

[0035] Synchronize the dq axes with the current i d , i q The given value is set to zero;

[0036] When the motor controller enters the active discharge program, the counter t1 starts counting;

[0037] When th...

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Abstract

The invention relates to a motor controller high voltage bus capacitance discharging method. When a finished vehicle key switch is turned off and simultaneously a finished vehicle high-voltage relay is disconnected, a motor controller enters an active discharging program, and capacitance residual charge is consumed through the heating of a motor winding, if not, the motor controller is normally operated. By adding an active discharging strategy, the discharging of the residual charge can be rapidly accomplished, and the safety and reliability of a finished vehicle are improved.

Description

technical field [0001] The invention relates to a car power system, in particular to a motor control system of a new energy vehicle, and in particular to a method for discharging a high-voltage bus capacitor of a motor controller. Background technique [0002] At present, people pay more and more attention to the protection of the environment and the effective and rational use of energy. Therefore, high-efficiency, energy-saving and environmentally friendly new energy vehicles have become one of the development trends of the automotive industry. Based on the electric drive system, it can achieve the purpose of low energy consumption and low emission, and has great market prospects. [0003] When used in cars, due to the limitation of installation space, the size of the motor drive system is strictly required. Therefore, the sine wave permanent magnet synchronous motor is generally used in the drive system of new energy vehicles. It has the characteristics of reliable operat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/00
Inventor 罗晓林伟义陈立冲王瑛蔡交明
Owner CHERY AUTOMOBILE CO LTD
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