Development And HIL Validation Of Electronic Braking System Ecu For Commercial Vehicle

The brake system is the most important components to ensure the vehicle safety. Duringthe brake process, the brake system must maintain good handling ability, meanwhile, ensurethat the car stop within a safe distance. For the commercial vehicles which transport thegoods or passengers, the performance of brake system is an important indicator to evaluatethe safety performance.This paper topics from the National Natural Science Foundation "based on theheavy-duty semi-trailer model predicts the kinetic stability of multi-objective control study"(Project No.51075176).This paper is mainly aimed at the design of the controller forElectronic Braking System (EBS). Based on the17degrees of freedom andhardware-in-the-loop simulation test-bed, this paper focus on the design of the ECU and theprogram, as well as the closed loop test. The following work is included in this paper:(1)Through the description of the structure analysis and research status of EBS, theperformance requirements of EBS functions are proposed. This is the basis of the hardwareand program design.(2)The brake signal sensor test can obtain its output type and amplitude, which can beused as the basis of the intention of the driver identification. The response time and thecharacteristic curves of the proportional relay valve through the test. This can be used as thebasis of the control method of the proportional relay valve. The response time and thecharacteristic curves of the axle modulator can also through the test. This can be used as thebasis of the control method of the axle modulator.(3)EBS hardware design, which includes the selection of the microcontroller, theminimum circuit design, the design of the external driver circuit, the design of the signalprocessing circuit, CAN communication design. The hardware design adopts the global design rule, which departs the design into certain modules. Each module is designedaccording to different functions, and communicates through I/O interface.(4)ECU program design, which includes system initialization module, vehicle stateestimation module, driver intention recognition module, conventional brake module,emergency brake module, valve control module and CAN communication module design..The program needs to meet the requirements of real-time, accuracy, reliability, easy modifyand portability.(5)This paper conducts EBS hardware-in-the-loop simulation tests. The test conditionsare loaded conventional brake, unloaded conventional brake, loaded emergency brake,unloaded emergency brake. The test results show that the control strategy in conventionalbrake consideration can make the expected deceleration. This can reduce the driver’s burden.The control strategy in conventional brake consideration can maximize the use of the groundbraking force, which can improve the safety of the vehicle.