The Control Strategy Of Vechile Inertia Brake Test Bench Based On Dc Drive

The vehicle inertia brake test bench is the equipment to test the quality and performance of brake. The flywheel is usually used on the test bench to simulate the mechanical inertia, but this method has a lot of shortcomings such as the flywheels are weighty, bulky, and they can not change the load, thus it is necessary to be replaced by another method.The brake test bench based on electric inertia is through controlling the DC motor, the output inertia of DC motor can simulate the mechanical inertia. First of all, the key variables-speed and current are found, which can affect the system performance. The ADRC controller is designed to control the outer speed loop while the PI controller is designed to control the inner current loop. Through the speed-current dual closed loop control, to achieve the goal that the electric inertia can simulate the mechanical inertia. The simulation result has shown that the electric inertia system under ADRC control can not only simulate the mechanical inertia, but also effectively suppress the interference within the system.In the brake test bench system, the brake force is produced through the pneumatic force servo system. Since the cylinder causes the crawl phenomenon when it runs under slow speed, the analysis of the mechanism of the phenomenon of cylinder crawling is proposed, the key variable which is friction is found, as friction can't be directly detected, extended kalman filter observer is designed to estimate the friction in the pneumatic force servo system online, then the estimated friction is introduced to the control input for friction compensation. The simulation result has shown that this method has good dynamic and static characteristics, high tracking accuracy, high robustness, and also the response time is quickly.Since the control strategy of pneumatic force servo system and electric inertia system is simulated and the conclusion has had, the control strategy is verified through the test bench to achieve the goal that the electric inertia can simulate the mechanical inertia. The experiment result has shown that the control strategy of the brake test bench works well, and it is in full compliance with the control requirements.