Research And Development Of Magnetorheological Limited Slip Differential

With the improvement of living standard,people’s requirement of car is high,not only low price,beautiful shape,but also safe,comfortable,energy-saving and environmental protection.As an important part of a car,automobile differential reflects comfort,stability,trafficability and so on.Because currently limited slip differential still exists some deficiencies,based on the new intelligent material magnetorheological fluid and ordinary differential characteristics,this article researches and develops a new magnetorheological differential,which effectively improves performance of the car,perfects the deficiency of the traditional differential and increases its intelligence.Mainly from structure design,electromagnetic analysis and control simulation,this article studies magnetorheological differential.First of all,through analyzing and comparing the properties of different MRF and the influence of various factors on the shear stress,it chooses a suitable MRF.Using the properties of MRF,it designs the structure of the friction plate group,analyzes the influence of various factors on differential torque,and gets the relationship of differential torque and magnetic induction intensity.Combined with the friction plate group and ordinary differential,it designs integral model of magnetorheological differential and gets prototype of differential.Secondly through the magnetic circuit theorem and design principle,it designs two kinds of magnetic circuit model for the prototype.Respectively in the theoretical calculation and electromagnetic simulation,from the structure size,the size and uniformity of the magnetic induction intensity,it compares two kinds of magnetic circuit and chooses the optimal solenoid type magnetic circuit model.In addition,through the design and decorate of coil,it gets the relationship of the magnetic induction intensity and the exciting current.Finally using structure design and electromagnetic simulation,it gets the relationship between the differential torque and the excitation coil,and analysis magnetic rheological limited slip differential effects on vehicle performance.Through the establishment of the vehicle dynamics model,the dynamic differential equation is obtained to determine the input and output parameters.Based on the sliding mode controller and Kalman state estimation system,simulation model is established in SIMULINK.It analyzes output performance of magnetorheological limited slip differential in understeer and oversteer,and compares centroid side-slip angle and yawing angular velocity between traditional differential and magnetorheological limited slip differential,so that magnetorheological limited slip differential can effectively improve the vehicle’s handling stability.