Control method and system for limping running of pure electric automobile

Abstract

The invention relates to a control method for limping running of a pure electric automobile. The control method is performed in the process that a complete vehicle controller performs judgment on failures relevant to the limping running according to an accelerator pedal opening signal, a brake pressure signal, a charged electric state signal and a temperature signal of a power battery, a temperature signal of a driving motor and the like; when limping running determination conditions are satisfied, according to the set limping running vehicle speed and the actual vehicle speed of a current vehicle, the objective discharge power of the power battery is obtained through a closed loop feedback control algorithm; by combining the power value obtained through the calculation of the power value, the DCDC voltage and the current of an air conditioning system, and the maximum allowable torque of the driving motor is obtained according to the rotating speed of the driving motor and the efficiency of the system; further according to the opening of an accelerator pedal, the opening and the closing of a brake pedal, and shifting positions, manipulated by a driver, the objective torque of the driving motor at this moment is determined and output. Through the adoption of the method disclosed by the invention, the properties of vehicles under current working conditions are guaranteed, and the running safety is also guaranteed.

Description

technical field [0001] The invention relates to the technical field of vehicle power system control, in particular to the technical field of pure electric vehicle power system control. Background technique [0002] At present, in pure electric vehicles, the power battery is too low or the temperature is low, the temperature of the power system components such as the power battery or the drive motor is too high, or the accelerator pedal opening voltage value is faulty, and the brake pressure voltage value is faulty. At this time, there are two main ways to deal with the whole vehicle: limiting the output power of the power battery or stopping the vehicle power output. [0003] If the first method is adopted, it is the method of limiting the output power of the power battery. Since the speed of the vehicle is not limited, when the driver needs a higher speed, faults such as power battery current overcurrent and battery voltage drop are prone to occur, resulting in loss of veh...

AI Technical Summary

Problems solved by technology

Since the speed of the vehicle is not limited, when the driver has a demand for a higher speed, faults such as power battery current overcurrent and battery voltage drop are prone to occur, resulting in the disappearance of vehicle power and bringing safety hazards to the driver.

[0004] If the second method is adopted, that is, the method of stopping the power output of the vehicle, the power battery and the drive motor still have a certain power output capacity, or the failure of the accelerator pedal and brake pressure does not affect safe driving and can be recovered by itself. , reducing the driving performance of the vehicle

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