Research On Control Algorithm Of Vehicle Traction Control System Under Complicated Road Conditions

Vehicle traction control system (TCS) is the typical one of the active safety systems.It can control the driving slip ratio to an optimum scope through adjustments of the enginetorque output and active brake pressure, so that the vehicle can obtain a good accelerationand driving stability performance.This paper is based on the research achievement of vehicle dynamics and control groupin vehicle dynamic field. A vehicle dynamic simulation platform has been built andimproved in this research, besides, the control algorithm of TCS under complicated roadconditions and the method about actual vehicle road tests are mainly discussed in this paper.The general contents of this paper can be summarized as follows: Firstly, build andimprove the simulation test platform, which can be used for verifying the controlstrategy of TCS. The platform can simulate the complex control logic through theStateflow toolbox, and improve the engine model and active brake system model as well.The simulation analysis of TCS under different conditions can be confirmed by thisplatform. Secondly, a new coordinate control strategy between engine torque control andactive brake based on the different road friction conditions has been proposed in thispaper. The control strategy can avoid the power consumption each other between drivingtorque and brake torque. Thirdly, build the TCS control algorithm based on the variableparameters of PID control theory. Some simulation tests about engine torque control andactive brake control have been implemented to validate the control algorithm. Thesimulation results show that this method can restrain the skidding of the driving wheelsand also improve the acceleration ability and driving stability. Finally, the actual roadtests have been carried out; the tests and evaluation method have been also summarizedin this research. The results of the actual road tests have verified the proposed controlalgorithm can control the driving slip ratio under the complicated road conditions, and ithas a good robust and adaptability.