The Simulation Research Of Pneumatic Braking System’s Dynamic Characteristic For Commercial Vehicle

With the improvement of road conditions, Vehicle Technology and the speed, themanufacturer is more concerned with the driving safety and reliability of cars. While, theperformance of brake system and the quality of brake actuator components are the key toensure safe driving. Emphasis on static characteristics and ignore the characteristics ofdynamic response, will inevitably lead to differences in analysis results and actual situation.At the same time, the lack of research on the energy supply, storage and consumption of airbrake system tell us that, to set up a dynamic model which can be able to emulate their workprocess is very necessary for the study of the braking system.In this paper, the modeling methods and response characteristic of the pneumatic brakingsystem for commercial vehicles are discussed, which are based on a collaboration project”The simulation technology development of the commercial vehicles’ braking system” with acompany. First, by reading a lot of literature, the basic theory of pneumatic, the compositionand working principle of air brake system were brief introduced. Then it analyzes the mainbrake system components, including the dual-chamber brake valve, relay valve, ABSpressure regulator, brake chamber, and its work principle and mathematical model areestablished. Then established their simulation model, Analyzing of the responsecharacteristics and the relationship between pressure and ejector seat stroke of the series ofdual-chamber brake valve in the states of circuit failure or not, Analyzing of the pressurecharacteristics and response characteristics of the relay valve, Analyzing of the dynamicresponse characteristics and the operation with the solenoid valve switch of the ABSpressure regulator in the states of pressurization, decompression, step pressurizing and stepdecompressing, Analyzing of the response characteristics and the change of push rodstroke of the brake chamber in the states of different pressure source. Finally, the simulationresults were compared with experimental results.Built the brake system integration model on the basis of the establishment of the main components simulation model to analysis of the pressure response of the whole system. Andcompared simulation results of the pressure response with vehicle experiment in the frontand rear axle air chamber, to verify the correctness of the entire system model. Then weestablished energy supply equipment for braking system, simulated the combined effects ofenergy supply, energy storage and energy consumption, to analysis the matching relations ofcompressor, air reservoir and brake chamber between the three. Finally, we explored theCo-simulation of the air brake model based on AMESim and the vehicle dynamicssimulation mode in TruckSim, simulating the100km/h-0braking conditions, obtaining hevariation of vehicle speed with time and the like.Through the study of the above, so as to provide data for the development and match ofnew braking system models, to shorten product development cycles, gaining the upper handin the market competition, but also can significantly save costs. Therefore, this issue is notonly a very important theoretical value, but also has a very realistic engineering significance.