Lateral Stability Anlysis And Driving Force Distribution For Electric Vehicle

Because the electric car can achieve zero emission, therefore, theapplication of electric automobile is one of the important measures to improvethe environment. This topic focuses on the four-wheel independent drive electricvehicle, improving the lateral stability of vehicle, establish the nonlinear vehicledynamics model, analysis vehicle dynamic characteristics, through a certainalgorithm, combined with the corresponding controller design, put forwardreasonable and appropriate four-wheel drive moment distribution method,improve the vehicle stability, comfort and active safety, The main were asfollows:First, combined with the actual demand and the reality the topic, weestablished vehicle motion equation, also combined with the study of tire brakingmodel, nonlinear tire model, etc. analyzed vehicle dynamic characteristics,discussed the establishment method of seven dof nonlinear dynamic model andcompleted the construction of the whole vehicle model in Matlab/Simulinkenvironment.Then, we putted forward the theoretical analysis of EV lateral stability, onthe basic starting point of lateral stability, studied driving force distributioncontroller design and algorithm for two types of extreme road conditions: first,we putted transient low adhesion, low adhesion road split road as, took the totalvehicle driving force and yaw moment as the basis measure, by a certainalgorithm research and controller design, to realize distribution, second, weputted vehicle front wheel big angle input as the condition of experiment, torealize to control vehicle driving force distribution accompanied bycorresponding algorithms.Finally, we simulated on vehicle stability system, compared relatedparameters curve, conclusion: first, split low adhesion road,. After theapplication of driving force distribution system, the performance of the vehiclehave improved significantly, the wheel acceleration and total driving force keepat a right level, yaw moment had obvious inhibition, the control input alwayskeep a lower value, driving force saturation characteristic were well avoided;second, under the condition of large angle input, the equality constraintalgorithm, inequality constrained quadratic programming algorithm has moreobvious advantages, yaw rate are well controlled which are related to vehicle stability, drive force were also effectively control within the restrictions.We can get that the vehicle stability control system design and algorithmresearch improved vehicle performance, optimize the vehicle’s operation,improve the comfort, stability, and the active safety of vehicle against theproposed two kinds of extreme pavement conditions. We got the desired effectthrough the research. Active safety related research our research provided therelated research in the field of information.