Research Of Bed-testing Evaluation Method Of ABS Performance

Automobile brake performance is one of automobile major performance, it concerns the safety of automobile traveling. Anti-Lock Braking System prevent wheels from locking, reduce the slide of automobile and prevent slide of side direction of vehicle. However, with the using of vehicle and some other factors, it can cause automobile ABS to lose its function or make its function drop, and it can bring hidden troubles for vehicle traveling.ABS testing methods include road-testing and bed-testing, actual ABS testing method is road-testing, but road surface situation and friction coefficients of the internal automobile break proving ground is not accorded with nation standard. Otherwise, actual ABS bed-testing still need whole vehicle test, and need big area of test ground. The bound of test vehicle is limited by test-bed, so that method is not applied in every test situation.The aim of this subject is to design a new scheme of test-bed for ABS in lab. According the overseas latest new method, the test-bed merge the mix simulation platform-dSPACE and vehicle model- Tesis, after the sufficient research of ABS configuration, theory and index of performance. The scheme have two step: open loop test and closed loop test. Open loop test, first use signal generator simulate the wheel speed signal, after the speed signal sent to the ABS ECU,then solenoids have action. Then electromotor drive the toothed exciter wheels, wheel speed sensors bring the signal to the ABS ECU, finally pressure sensors test the variability of pressure of every wheel pumps;Closed loop test, connect the ABS signal I/O interface in loop with dSPACE I/O interface, first configure the vehicle dynamics model of Tesis, in open loop situation validate the vehicle dynamics model, lastly, use the hardware in the loop method collect and analyse several index of performance, the average of slip ratio, stabilization coefficient, the average of break pressure etc.This subject pilot study the bed-testing evaluation method of ABS performance, But the simulation technology has not very well recently, the vehicle dynamics model can not substitute the actual vehicle, the hysteresis of hardware influence the veracity and real-time of simulation. Generally, this subject provide a new and constructive testing method of ABS performance.