Current inverse time limit protection method for pure electric vehicle

Abstract

The invention provides a current inverse time limit protection method for a pure electric vehicle. The current inverse time limit protection method comprises the following steps: calculating a corresponding heat speed value VCalor through a real-time current overload multiple; according to the current heat speed value VCalor, enabling the motor controller to accumulate the VCalor once every n ms to obtain a real-time total heat accumulation value S1; according to the allowable overload multiple x and the allowable overload duration T1 of the motor controller, acquiring an allowable total heat accumulation value S2 , and when the real-time total heat accumulation value S1 is larger than the allowable total heat accumulation value, carrying out maximum torque reduction output; and when the current real-time overload multiple is smaller than 1, enabling the real-time total heat accumulation value S1 to be reduced, and when the real-time total heat accumulation value S1 is reduced to an artificial set value S3, adjusting the torque power value output by the controller to be the maximum value. According to the method, the current temperature characteristic curve of the motor controller can be fitted to the maximum extent, the motor controller is effectively protected, and the performance output of a power system is kept as far as possible.

Description

technical field [0001] The invention belongs to the field of electric vehicle power, and in particular relates to a current inverse time limit protection method for pure electric vehicles. Background technique [0002] The operating conditions of electric vehicles are complex, and may need to run in the conditions of frequent continuous climbing. According to the design of electric vehicle power system requirements according to regulations, the peak torque needs to be maintained for 1min, and then the torque output can be reduced. According to the output of power devices Under different current values, the continuous output time of the power device is different. The larger the current value of the power device, the shorter the allowable output time. In order to better fit the output characteristics, a different current is designed. The sustainable characteristic curve is of great significance for analyzing the continuous climbing condition of pure electric vehicles. Conten...

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Problems solved by technology

[0003] In view of this, the present invention aims to propose a current inverse time-limit protection method for pure electric vehicles to solve the problem that the continuous output time of power devices is affected by the current value under the continuous climbing condition of existing electric vehicles, and it is inconvenient to analyze the electric current. The problem with the power characteristics of the car

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