Design Of EBS Controller And Brake Force Control Strategy For Commercial Vehicles

In order to distribute the braking force of hybrid commercial vehicles better,obtain more accurate and stable vehicle braking force and improve energy recovery efficiency,this paper proposes a hybrid electric bus(HEB)braking force based on electronically controlled braking system(EBS)Control strategy,and refer to the relevant foreign prototypes,design EBS controller hardware and driver software,to achieve the control and detection of each relevant actuator.In terms of braking force control strategy,first of all,by collecting relevant information such as wheel speed,motor engine output torque and braking force,a hybrid algorithm of extended Kalman filter(EKF)and recursive least squares(RLS)is used to estimate the road slope in real time respectively And vehicle quality.Secondly,the total braking force required for braking is calculated by combining the expected braking intensity with the estimated vehicle mass and road gradient through the sliding film control(SMC)method.In addition,on the premise of realizing the driver's braking intention and meeting the technical requirements and regulations of commercial vehicle and trailer brake systems,the braking force is distributed according to the state of the motor to regenerative braking and pneumatic braking to improve the recovery of braking energy the amount.In terms of controller hardware design,this article focuses on the processing and safety protection of core signals such as brake pedal signals and related solenoid valve control signals,and selects relevant automotive-grade chips to design EBS hardware electronic controllers with safety redundancy.To implement certain safety functions.At the same time,design related drive software and hardware to ensure the realization of related safety functions.Finally,this paper uses Matlab / Simulink to build a vehicle simulation model,and runs the designed algorithm to simulate to verify the rationality of the control strategy,at the same time obtain the relevant braking force and solenoid valve pressure control parameters,and through hardware in the ring test bench The experiment tested the pressure inside the control valve.The results show that the state estimation algorithm in this paper improves the accuracy of quality estimation,and the error is reduced by 2% compared with the traditional EKF algorithm.Through accurate control and distribution of braking force,the stability of braking can be improved and the braking distance can be shortened,which is effective improve braking performance and better recover braking energy during braking,which can increase energy recovery by about 6%.