Research Of Relationships Between Brake Temperature Rise And Mountainous Road Parameters Or Vehicle Condition

Severe traffic accidents are often caused due to the special geographical situationon western mountainous road, such as rugged terrain, sharp and continuous bends,continuous long steep downhill, high road embankment, intersection and otherdangerous sections. Chongqing is an important transportation hub in Southwest China,the terrain is undulating and mountain peaks are widely distributed, mountainous areaand hazardous terrain are common, Chongqing has all the typical sections of westernmountainous road. Through the investigation of traffic accidents occurred on specialsections among those accidents occurred on Chongqing mountainous road, downhillsection is the special section on which the most traffic accidents occurred.Chongqing typical downhill section is taken as the research object in this article,and small car Buick SGM7160SL、Medium buses Jinbei sea lion green power seriesSY6513XS1H、heavy truck the Futian Ruiwo3-180-the Futian BJ3062V3PDB-B1Three car used in the road test chamber as the research vehicle models. From themechanical characteristics and safety of the vehicle when driving long downhill section,and consider the characteristics of the experimental research vehicle front and rear brake,and analytical model of braking energy under long downhill sections as well ascontinuous braking is established. Through the relationship between parameters such asbrake temperature rise and vehicle load, vehicle speed, road slope and slope length,temperature rise model of engine assistant brake and combined brake in the downhillsections is established. Coast-down test, engine auxiliary braking road test, the longdownhill sections of continuous brake of vehicle test are processed respectively, basedon the mathematical model and the corresponding vehicle and road parameters neededin the model, combined with real-time data collected from the corresponding sensor andmodel formula imported, the variation of brake temperature with changes of thosefactors during the process of vehicle brake is calculated and analyzed, and quantitativerelationships between vehicle brake temperature rise and parameters such as vehicleload, vehicle speed, road slope and slope length.The research provides basis for the safe driving of vehicle in the long downhillsections under continuous braking conditions, provides theoretical foundation forhighway alignment design in mountainous, supports theoretically safety early warningdevice of vehicle on the mountainous downhill road, offers practical research value forvehicle safety research on western mountainous road.