Motor controller overload protection method and system

A motor controller and overload protection technology, applied in the control system, motor control, electrical components, etc., can solve the problems of threatening the driving safety of the driver and the difficulty of judging the overload status, so as to improve safety, reduce torque and prolong service life Effect

Inactive Publication Date: 2016-07-20
ZHENGZHOU YUTONG BUS CO LTD
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  • Abstract
  • Description
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Problems solved by technology

However, this method has certain limitations. When the driver is in a special road condition and the motor is frequently switched between overload and non-overload, it is difficult to judge the overload situation. In addition, the protection malfunction will seriously threaten the driving safety of the driver.

Method used

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  • Motor controller overload protection method and system

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Embodiment Construction

[0020] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] Embodiment of a motor controller overload protection method of the present invention

[0022] This embodiment is aimed at the motor controller of the new energy vehicle. The present invention detects the output current of the motor controller, and when the output current value is greater than the rated current, judges the duration of the current to confirm whether it is really overloaded. When the overload state is about to be reached , by limiting the current and judging the duration to achieve stepwise derating measures, so as to avoid reaching the protection state of overload power failure. The implementation process of this method is as follows figure 1 As shown, the specific implementation steps are as follows:

[0023] 1. Collect the output current of the motor controller.

[0024] When the whole vehicle starts to run and the...

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Abstract

The invention relates to a motor controller overload protection method and a motor controller overload protection system, which belong to the field of new energy automobile motor control technologies. The motor controller overload protection method comprises the steps of: detecting an output current of a motor controller, judging duration of the output current when an output current value is greater than a rated value, confirming whether overload is real, and achieving a ladder form derating measure through limiting current and judging the duration when an overload state is about to be reached, thereby preventing an overload power off protection state from being reached. The motor controller overload protection method and the motor controller overload protection system can allow a motor to reduce torque more smoothly in an overload state, have obvious buffer function for the overload state, effectively improve driving feeling of a new energy automobile, are free of sudden interruption of power, can reduce destructive effect of the motor in the overload state, prolong the service life of the motor, and enhance safety of vehicle driving of a driver.

Description

technical field [0001] The invention relates to a motor controller overload protection method and system, belonging to the technical field of new energy vehicle motor control. Background technique [0002] When new energy vehicles are driving on different road conditions, the overload of the drive motor controller is one of the common faults of new energy vehicles. When the output current of the motor controller exceeds its rated output current, and the duration exceeds the allowable temperature rise of the internal IGBT of the controller, the controller will be overloaded. However, as the motor speed changes frequently, the water temperature of the cooling system changes with the ambient temperature, so the heat dissipation conditions will also change accordingly. At the same time, during the process of controller speed regulation, the current value will also fluctuate greatly, so it is more difficult to judge the overload protection of the motor controller. Impact. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/032
CPCH02P29/032
Inventor 靳超郑维韩光辉刘朝辉张冬乔理想
Owner ZHENGZHOU YUTONG BUS CO LTD
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