Study On Anti-Slip Performance And Control Strategy Of Vehicle

Vehicle accelerate in slippery and soft road,often caused driving wheel slip,vehicle lateral stability decreased and get out of control easily.Wheel loader machine as the earthwork machinery,bad work environment usually caused wheel slip and lead vehicle driving and through performance decline,affected the progress of the operation and efficiency.Domestic engineering vehicle differential usually use ordinary differential or limited-slip differential for friction-type.Active limited-slip differential used more on the car and engineering vehicles rarely.As if its application in the wheel loader,the traction ability when the loader operating will be greatly improved.According to the domestic and foreign limited slip differential development,studied and analyzed the structure and principle of current common limited-slip differential,combined with loader ZL50,built the limited slip differential simulation model of the electro-hydraulic.For the driving transmission system of the ZL50 loader,the paper analyzed the transmission characteristics of the relevant parts,according to the experiment data,and in turn established mathematical model for the loader engine,the torque converter,the transmission,the drive axle and the wheel.The paper built the simulation system by these mathematical models in MATLAB/ SIMULINK.Based on slip-rate influence on the vehicle driving performance,considered manufacture costs of speed sensor,combined with four wheel drive characteristics explode the reference speed method based on vehicle dynamics,obtained slip ratio.Proposed traction control strategy and control method which based on slip rate of the active.The logic threshold control method is selected for the limited slip differential of ZL50 loader,and the feasibility of the logic threshold control is explored.Setting simulation condition for ZL50 loader machine,under non-symmetrical pavement requirement,loader machine's straight and steering simulation analyzed,result verified that electric hydraulic ALSD could overcome average torque distribution of ordinary differential,and good adaptability to the road,road adhesion coefficient difference is bigger on both sides,limit sliding effect more obvious.Low attachment region achieved better limit slip-and control the tire-slip ratio,thereby,loader machine has a higher driving force and the lateral force of the tire,ensured the vehicle's driving anti-slip performance and also verified the correctness and feasibility of the control strategy.