Electronic Brake Anti-lock Control for Electric Vehicles Under Emergency Braking
Electric vehicles can use electric motors for regenerative braking,converting the kinetic energy during the braking process into electrical energy and storing it in the power battery,which can effectively save energy and improve the vehicle's range.However,the motor slip rate of electric vehicles is affected by emergency braking,constantly changing and presenting ambiguity,making it difficult to meet the braking needs of drivers at any time,especially after wheel lock up.In this context,a study is conducted on an electronic brake anti-lock control method for electric vehicles under emergency braking.Magneto-electric sensors are used to collect and preprocess the wheel speed of electric vehicles,and the slip rate is calculated based on the wheel speed.The slip rate difference is calculated based on the ideal slip rate.The slip rate difference is used as input to the controller,an adaptive fuzzy PID controller is designed,and a braking control signal is generated.The electronic braking torque and regenerative braking torque are adjusted based on the braking control signal to prevent wheel lock up.The results show that after emergency braking,under the adaptive fuzzy PID controller,the slip rate of electric vehicles quickly decreases to the ideal range(15％to 20％).In addition,the braking distance of the studied method is relatively small under various road conditions,demonstrating good anti-lock braking control efficacy.
emergency brakingelectric vehicleselectronic brakeadaptive fuzzy PID controlleranti-lock braking control
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