| Distributed electric drive is a new type of electric vehicle driving form,which uses the in-wheel motors to drive the vehicle.The distributed drive electric vehicle has the advantages of short transmission chain,large space and precise control.At the meantime,the research of distributed electric vehicle has a vital significance in the development of automobile industry in our country.This paper uses the distributed drive electric vehicle as the research subject.It puts forward a suitable Anti-Slip Regulation(ASR)control strategy for distributed drive electric vehicle after the analysis of the characteristics of its structure and control.The content of this paper is as follows.(1)Introduce the overall development situation and the trend of electric vehicles especially the research situation of the distributed drive electric vehicles and the current achievements of various countries.At the same time,introduce the structure of distributed drive electric vehicles.(2)Through the Matlab/Simulink to build the 7 degrees-of-freedom distributed drive electric vehicle dynamic model.On this basis,use this model to verify the related algorithms.(3)Put forward a new vehicle velocity estimation algorithm,which bases on the sensors of motor and vehicle acceleration.This new algorithm not only can estimate the vehicle velocity and curb weight but also can estimate the informations of noise,which can help to improve the precision of velocity estimation.(4)Base on results of the velocity estimation,use the slip rate and the adhesion coefficient as inputs and calculate the similarity among the current road and 4 standard roads using the fuzzy inference algorithm.In order to avoid the influence of subjective factors,we use Adaptive Networkbased Fuzzy Inference System(anfis)to independent study the membership function and fuzzy rules.(5)Use PID control strategy to control the ouput troque of the driving motors,which is using the optimal slip ratio as the control objective. |
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