Safety Study Of Heavy Vehicle Driving Downhill Basing On Exhaust Valve Brake

As China's economy develops fast, road transport of china also begins to grow quickly.At the same time there is a serious problem,more and more traffic accidents cause grievous consequence by heavy vehicles driving downhill especially.One main reason of the traffics made by heavy vehicle is that the efficiency of service brake slumps greatly,so it's a valid proposal to install sustained braking system on heavy vehicle.This article studies the principle and working process of several sustained braking system.Compared with other sustained braking system, Exhaust valve Braking system(EVB) is a better sustained braking system. EVB system has been comprehensively used in developed countries and making good effects。This article researches characters of EVB precisely.This article studies the principle and working process of EVB and studies the usage of EVB.In order to study the results of EVB,we make a experiment of EVB on level road. Then we analyse the results of the experiment and get a statement of sustained braking. At the same time we calculate sevral parameters of engine.This article creats a mechanical model of heavy vehicle basing on theoretical arithmetic, and do a simulation of mechanical model. We study the mechanics equilibrium of heavy vehicle driving downhill at a constant speed and make a derivation of the results gotten before.At last we draw a conclusion,getting the speed of heavy vehicle driving downhill at different ratios of slope when the vehicle is no-live load or fully loadedThis article provides a thereunder for heavy vehicle with EVB system driving downhill.lt provides a guiding suggestion to improve the safety of heavy vehicle driving downhill.