Improvement Design And Simulation For Bus's Air Braking System Based On EMB

Air brake system was currently widely used in bus brake system. Although the brake system was mature in technology and simple in structure, there was inevitable problem in braking such as delayed braking time which could result in long braking distance. Therefore, to shorten the delay time and reducing braking distance is the development direction of bus brake system.Firstly, by introducing the evolution of the braking system, we lead out the EMB system. Basing on the fully understanding and mastering of the principle of EMB system, its current development status and current problems, we found that the long braking distance due to the long air brake system delay time especially the long rear brake system delay time as a result of a 6120-type bus brake performance test and test data analysis. To resolve the problem, we improved the design for Bus's Air Braking System Based on EMB system. As a result, we could reduce the rear brake delay time and improve the braking efficiency. This was our purpose of improvement design.To effectively reduce the rear wheel brake delay time, a better approach was the use of EMB system's electronic control mode instead of the air control mode. The overall improvement design was that the front wheel still maintained the existing air brake air control mode but the rear air brake was controlled by electricity. Consideration of the reliability and security in existing technical conditions, we followed the principle of minimizing the use of electronic components and little changes in the existing brake system. So the rear brake still use the existing air brake system as well as pressure-driven brake chamber to drive the brake disc/drum brake structure.Finally, according to the basic parameters of test bus, we got a simulation model. We analyzed the simulation of the efficiency of the improvement in bus braking system by using the ADAMS. The results showed that the improved braking system reduced the braking distances by 1.6m and the probability of reducing was 11.1% in the event of the continuous improved braking deceleration is less than the case of test-like vehicles and under 34km/h initial speed of braking. The braking stability was good. Therefore, by improving the braking system to reduce the bus braking delay time of inception and the maximum braking force delay time, we could shorten the braking distance and improve braking performance. The results were obvious.The research topic provided the ideas not only for the improvement of the existing vehicle brake system, but also for the development of new braking system bus. Of course, this could provide some reference on how to shorten the braking distance. In addition, the research results can solve the air brake system problem of transition to the EMB for the current bus system by improving the design of the braking system. If the research continues, it will bring better value and commercial value.