Electric vehicle motor control method and system based on current detection
A technology of electric vehicle and motor control, applied in the direction of motor control, electric vehicle, control system, etc., can solve the problem of untimely protection of motor power module, improve the efficiency of fault detection and realize the effect of safety control
Active Publication Date: 2020-07-10
深圳熙斯特新能源技术有限公司
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[0005] In view of the above, the present invention provides a current detection-based electric vehicle motor control method and method, the purpose of which is to solve the technical problem in the prior art that the protection of the motor power module is not timely due to the lag time in the hardware circuit detection fault
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[0034] In order to make the object, technical solution and advantages of 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. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0035] figure 1 It is a flow chart of a preferred embodiment of the electric vehicle motor control method based on current detection in the present invention. Such as figure 1 The shown electric vehicle motor control method based on current detection, applied to permanent magnet synchronous motor and resolver, the method includes:
[0036] S10: Using the speed sensor to obtain the current...
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The invention relates to a permanent magnet synchronous motor technology, and provides a method and a system for electric vehicle motor control based on current detection. The method comprises the following steps: utilizing a rotating speed sensor to obtain the current rotating speed of an electric vehicle motor in real time, searching a pre-configured mapping relation table according to a given torque command input by a user and the current rotating speed of the motor to obtain a first current value corresponding to the given torque command, acquiring a current three-phase current instantaneous value of the motor by using a Hall current sensor, calculating a difference value between the first current value and the current three-phase current instantaneous value, judging whether the difference value is greater than a first preset threshold value or not, and sending out first early warning information and executing power limiting operation on the motor when the difference value is greater than or equal to the first preset threshold value. The method and the system can improve the detection efficiency of the fault current, and achieve the safety control of the motor.
Description
technical field [0001] The invention relates to the technical field of permanent magnet synchronous motors, in particular to a method and system for controlling electric vehicle motors based on current detection. Background technique [0002] The power system of a pure electric vehicle is driven by a motor, and the motor controller converts the direct current into a sinusoidal alternating current through an inverter to drive the permanent magnet synchronous motor to provide power for the vehicle. The power module of the motor controller uses IGBT. Due to the cost of the whole vehicle, it is difficult to choose a high-specification and high-current module for the power IGBT. Therefore, the power module is basically selected according to the peak current of the motor. It can be detected in time, and the output of the IGBT power module is turned off, so as to prevent the power module from being damaged due to excessive output current of the power module due to excessive tempera...
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IPC IPC(8): H02P29/028H02P29/032H02H7/085B60L15/28B60L3/00
CPCB60L3/0061B60L15/28B60L2240/12B60L2240/429H02H7/085H02P29/024Y02T10/64Y02T10/72
Inventor 陈跃东李文勇刘启安
Owner 深圳熙斯特新能源技术有限公司