The Strategy Of Power Reduction For Electric Vehicle

With the global increase in car ownership,the world's energy shortages,environmental pollution and global warming are becoming more and more serious,and it has become an important issue that people have to face up to.Therefore,in order to effectively alleviate these serious problems,the development of new energy vehicles has become the consensus of all countries in the world,and among all new energy vehicles,the structure is simple,the noise is weak,and even “zero emissions,zero pollution” electric vehicles stand out from the crowd and are more popular.With the development of electric vehicles becoming more and more rapid,the demand is getting larger and larger,and the performance requirements for electric vehicles are getting higher and higher.The safety problems of pure electric vehicles and the reasonable energy management problems proposed in this paper are proposed.The power strategy has mainly done the following work for this purpose:(1)The mathematical model of the asynchronous motor is analyzed.In order to simplify the control mode of the asynchronous motor,the transformation of the reference coordinate system is adopted.The voltage and flux linkage equations of the asynchronous motor in the reference coordinate system of the stator and rotor and the synchronous rotating reference coordinate system are derived,and the vector control of the asynchronous motor is completed.Based on this,the control flow of the power reduction strategy is given.(2)To classify the fault level of the electric vehicle,and to abandon the traditional high temperature problem of the electronic control system,the upper limit of the temperature is used as the limit,and the working mode of the upper limit power failure shutdown protection is reached,so as to limit the output power before this.Make it work continuously.For the secondary faults in the secondary fault of the electronic control system,the secondary fault problem of the controller housing temperature is too high,and the inverse power limit and the set temperature threshold are combined to reduce the power.In terms of strategy,the overload capacity of the motor operation is fully utilized and the efficiency of the motor application is improved.(3)Based on the battery under voltage of electric vehicle power battery system and the problem of increasing the mileage of the vehicle,combined with the driving experience related problems in the actual vehicle driving process,the corresponding power reduction strategy is proposed.The former is carried out by setting the voltage threshold linearly attenuating the power output to increase the mileage so that it can go home or reach a nearby electric pile.The latter limits the maximum power and limits the maximum speed of the motor to increase the range of the vehicle.(4)The corresponding strategies were carried out to verify the feasibility and effectiveness of the proposed strategy.