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Research on Bang-Bang Control of EPB System in Vehicle Hill Start

WANG Hong-liang;GU Wen-hao;ZHANG Qing-ke;WANG Er-lie;School of Mechanical Engineer,Nanjing University of Science and Technology;  
Due to the difficulty of vehicle hill-starting operation,a hill-start strategy of pneumatic electronic parking brake(EPB)was proposed based on a Bang-Bang control.Analyzing the force change of hill-start,pneumatic EPB principle and the working characteristics of the solenoid valve,a control method combined with pulse width modulation(PWM)and pulse frequency modulation(PFM)was put forward to carry out the control of solenoid valve of EPB.The corresponding relationship between the driving torque and braking force during hill-start was studied.Ideal control target of the demand pneumatic pressure in hill-start was presented.The Bang-Bang control algorithm was taken as the core algorithm of the system control strategy to control the solenoid valve of EPB.Experiments carried out on the test vehicle show the better control effect and the feasibility of the control strategy.
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