Abstract: ：According to the driving behavior of the four wheel drive vehicle on the sand terrain, an engine throttle controller for the traction control system(TCS) on the sand terrain was developed using the combination of the PI control and the threshold control. The road test of the TCS based on the target controller for the vehicle driving straightaway was performed on the sand terrain of a sandpit. The test results show that the developed throttle controller can effectively avoid the excessive spin of the driving wheels and prevent the driving wheels from sinking into the sand, so that the driving resistance of the vehicle can be reduced and the vehicle driving ability and traction performance can be improved.

Key words: vehicle engineering, traction control, target controller, sandy terrain, road test