Optimization For Vehicle Handing Stability Based On Suspension K&C Characteristics

With the highly rapid development of automobile industry, China’s own brand carmarket share also increased, but the research and development capabilities arerelatively weak. Only by making great efforts to improv the Chinese automobileindustry independent research and development capacity,can we fundamentally improvethe R&D capabilities.This research is based on a specific vehicle chassis R&D project, First of all, Thebenchmarking car has made a series of suspension K&C characteristics and vehiclehandling and stability real vehicle test. Based on these tests, the benchmark vehicle’sdynamic model is setted up by CARSIM, which has been verified by comparing with theexperimental data.In the second place,according to the three dimensional mathematicalmodel and the related design parameters which provided by the project， the frontsuspension and rear suspension of the target vehicle’s dynamic model was set up, and thesuspension K&C simulation of these dynamic model was also made by ADAMS. Using theresult of the simulation and the related design parameters，the target vehicle’s dynamicmodel is set up and making the virtual vehicle handling and stability test all by CARSIM.Compared with the performance index of the benchmark vehicle, the insufficient onhandling and stability performance of the target car is found. At last,choosing the degree ofundersteer as the evaluation index.Analysis of the factors which influenced the selectedevaluation index of handling and stability performance is conducted，and then the factorswas decomposed to the suspension K&C characteristics level.Based on the requirement ofthe project,we choose the suitable parameters and adjust reasonably to make the degreeof understeer of target car equal to the benchmark vehicle.In this article,the suspension K&C characteristics and it’s influence on the degreeof understeer were discussed. Based on the degree of understeer of the vehicleperformance,decomposing the factors step by step,the hard points of suspension arechosen as the parameters to optimize in the end. By Choosing the optimization scheme，adjusting the hard points，optimizing the suspension characteristics，to making thetarget vehicle performance is achieved.Which has a great important to analyzing thefactors on the handling and stability level，decomposing the factors of whole vehiclestep by step and improving the handling and stability of vehicle performance better.