A Study on Safety Intelligent Driving System for Heavy Truck Downhill in Mountainous Area 2018-01-1887
Mountainous area makes up more than half of the whole land area of China, the road of which is full of ups and downs. Heavy commercial vehicles as the main means of transport in mountainous areas, braking torque recession, even brake failure, often happens because of the overheating in long downhill journey, which seriously threats the safety of the driving. Therefore, this paper presents an intelligent assistant system based on Geographic Information System and vehicle dynamics. The main brake working time and heat generation can be effectively reduced through adjusting the speed at the ramp top, applying the engine auxiliary brake in the initial stage and choosing the brake time properly, in order to prolong the downhill driving distance and improve the safety of during continuous braking. In this paper, the characteristics of the road slopes have been analyzed and the effect of ramp characteristics on braking heat generation has been studied. To analysis the temperature rising characteristics of the main brakes under different initial speeds, the temperature rise model of the brake is established. Furthermore, the effectiveness has been recognized by comparing the main brakes’ temperature variation in real vehicle test. Research shows that an apparent temperature rise reduction performance of the typical ramps is achieved in the simulation, and the test results show a better performance of reducing braking temperature on actual road.
Jiakang Quan, Yanming Zhao, Gangfeng Tan, Yongbing Xu, Bo Huang, Tianming He
Wuhan Univ. of Technology, Beijing Institute of Space Launch Technology