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Method for calibrating current in motor-driven control system of electric automobile

A technology for motor drive control and electric vehicles, applied in the direction of motor parameter estimation/correction, etc., can solve problems affecting the accuracy of calculated current, reduce control errors and ensure feedback accuracy

Active Publication Date: 2013-09-04
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main control chip calculates the actual current according to the theoretical circuit parameters, but the actual deviation of the components in the sampling processing circuit will affect the correctness of the calculated current

Method used

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  • Method for calibrating current in motor-driven control system of electric automobile

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Embodiment 1

[0020] Such as figure 1 As shown, the current calibration method in the electric vehicle motor drive control system of this embodiment includes the following steps:

[0021] A: Use the regulated power supply to output the calibration current of multiple calibration current points to the current sampling circuit in the motor drive control system, and the calibration current points are evenly distributed within the range of the current sensor in the current sampling circuit;

[0022] B: using the control unit in the motor drive control system to collect the feedback current value corresponding to each calibration current point of the current sampling circuit;

[0023] C: Subtract the corresponding calibration current value from the feedback current value to obtain the deviation of the input and output current of the current sampling circuit;

[0024] D: Record the corresponding relationship between the calibration current value corresponding to each calibration current point, t...

Embodiment 2

[0028] The current calibration method in the electric vehicle motor drive control system of the present embodiment includes the following steps:

[0029] A: Use the regulated power supply to output the calibration current of multiple calibration current points to the current sampling circuit in the motor drive control system, and the calibration current points are evenly distributed within the range of the current sensor in the current sampling circuit;

[0030] B: using the control unit in the motor drive control system to collect the feedback current value corresponding to each calibration current point of the current sampling circuit;

[0031] C: Subtract the corresponding calibration current value from the feedback current value to obtain the deviation of the input and output current of the current sampling circuit;

[0032] D: Record the corresponding relationship between the calibration current value corresponding to each calibration current point, the feedback current v...

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Abstract

The invention aims at providing a method for calibrating a current in a motor-driven control system of an electric automobile. According to the method, current measurement error caused by circuit parameter deviation is revised, and the current loop-locked feedback accuracy is ensured, so that the control error of the motor-driven system is reduced. The method for calibrating the current in the motor-driven control system of the electric automobile is as follows: a control unit in the motor-driven control system acquires a current feedback value by use of a current sampling circuit, and obtains a corresponding relation table of input and output currents by virtue of a method of inputting a calibrating current into the current sampling circuit and collecting a corresponding current feedback value; and the corresponding relation table is applied to a control program so as to compensate an actual measurement current for current loop-locked feedback.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a current calibration method in an electric vehicle motor drive control system. Background technique [0002] Currently, the environment and energy are becoming a growing concern. In the field of automobiles, pure electric vehicles with high efficiency, energy saving and environmental protection have become one of the development trends of the automobile industry. Pure electric vehicles rely on power batteries for power supply and use high-power motor drive systems as the vehicle's power source. Therefore, the control performance of the motor drive system directly affects the comfort and handling of the vehicle. [0003] In pure electric vehicles, the motor drive system mostly adopts the torque control mode, and the current closed loop is the control core, and the sampling feedback of the current sensor is the basis of the closed loop. After the output of...

Claims

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Application Information

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IPC IPC(8): H02P23/14
Inventor 王金磊罗晓陈立冲王瑛蔡交明
Owner CHERY AUTOMOBILE CO LTD
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