Patent ID: 8364369

Claim:
A vehicle anti-rollback method, comprising: providing a vehicle that includes a pair of front wheels, a pair of rear wheels, a power unit, and a transmission connecting the power unit to at least one wheel of the front and rear wheels, the transmission including a plurality of forward drive ratios and at least one reverse drive ratio and a two speed gear reduction assembly configured to select between a high range drive ratio and a low range drive ratio when the transmission is in one of the plurality of forward drive ratios; sensing, using a controller, a vehicle rollback condition when the vehicle transmission is configured in a forward drive ratio; and the controller configured to execute the following functions: decreasing torque distributed from the power unit of the vehicle to the at least one wheel, and actuating a brake, when the rollback condition is sensed; executing drive ratio changeover from the high range drive ratio to the low range drive ratio after the decreasing of the torque and actuating of the brake; and increasing torque distributed from the power unit of the vehicle to the at least one wheel and releasing the brake after the low range drive ratio has been engaged.