Research On Simulation Of Driving Resistance Of Vehicle Based On The Bench-vehicle Dynamics Model

As an important means of transportation, the vehicle has become an essential partof people’s daily life. Under the background of low-carbon life, people persue thevehicle safety and reliability, at the same time, people pay more attention on power,economy and exhaust emission of vehicle. With the increase of driving time andmileage, the technical conditions of vehicle deteriorate, which is associated with poorpower, increased fuel consumption and exhaust emissions. So we must strengthen thedetection of vehicle performance. To complete the detection of vehicle power,economy and emissions, the first condition is correctly simulating the road resistanceon the chassis dynamometer. The simulation accuracy of road resistance will directlyaffect the accuracy of vehicle performance test. The road resistance is a dynamic data,it is difficult to get the accurate road resistance. According to the traditional methods,we need to do road test and lab test repeatedly to get road resistance. It not only takelong test cycle, but also cost huge manpower, material resources and financialresources. This paper puts forward the method of researching road driving resistancebased on bench-vehicle dynamics model after researching the road resistance anddynamics simulation.The paper firstly analyzes the force of car on the road, then analyzes the rollingresistance, air resistance, slope resistance and acceleration resistance. We can get thetotal road resistance of vehicle traveling on the road. According to the car drivingequation, the paper obtains the driving wheel torque equations, and the driving wheeltorque is proportional to the square of vehicle speed, the acceleration. Then the paperanalyzes the force of vehicle when driving on the dynamometer in the non-slipcondition. When the vehicle running on the dynamometer, there is no air resistance,slope resistance and part of acceleration resistance. In order to make sure that theresults of indoor detection is consistent with road detection, the loading device mustsimulate the lack external resistance.According to many years’ practical experience of the team, the paper designs thechassis dynamometer model in SolidWorks according to the DCG-10D chassisdynamometer. The size of the cylinder in the model and in the real equipment isexactly the same. The parameter of the frame of the equipment, motor and other partscan adjust appropriately without affecting the simulation results. The paper designes the vehicle dynamics model in ADAMS/Car. The model includes front suspensionsubsystem, rear suspension subsystem, steering subsystem, braking subsystem, powersubsystem, tire subsystem and body subsystem. In ADAMS/View, the paperestablishes the simulation platform by setting the constraints and simulate the drivingresistance of different driving conditions by setting the corresponding load torquevalue. The simulation results show that the dynamic response of the model is good,the simulation results of automobile road driving resistance are more accurate. Finally,do the real vehicle test in automobile application engineering laboratory. The paperdoes the test of uniform motion and accelerated motion by setting the correspondingloading force according to the driving conditions. Through the comparative analysisof the simulation test results and real vehicle test results, the results shows that thesimulation model has a high precision, and we can study the road resistance on thissimulation platform instead of the real vehicle test. The simulation test can savemanpower, material, financial resources, and shorten the development cycle, whichlaid a theoretical foundation for the in-depth study on the control system of chassisdynamometer.