Combining spare wheel identification and wheel speed compensation,limited slip feedforward control based on equal utilizable friction coefficient on the front and the rear axle and limited slip feedback control based on axle speed difference were designed.And an on-demand 4WD vehicle dynamics simulation platform was built to verify the effectiveness of small spare tire identification,wheel speed compensation,and limited slip control.The strategy can achieve the central differential and differential slip limiting functions of on-demand 4WD vehicle,improve vehicle's power performance and driving stability,avoid the error trigger of limited slip control caused by the difference in rolling radius,and solve the abnormal wear and ablation of the multiple-plate clutch caused by the small rolling radius of the spare tire.
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