Patent ID: 8886421

Claim:
A system for protecting a drive shaft, comprising: a vehicle state detector detecting vehicle information including a currently selected shift-speed, a current steering angle, a vehicle speed, and an engine RPM; a traction control portion analyzing the vehicle information delivered from the vehicle state detector and demanding reduction of an output torque of an engine when a predetermined condition is satisfied, wherein the predetermined condition is satisfied when simultaneously satisfying following conditions: (i) the currently selected shift-speed is a reverse speed, (ii) the current steering angle is a full turn angle in a state of reverse speed and (iii) a stall condition in the state of reverse speed is satisfied, wherein the stall condition in the state of reverse speed is satisfied when the vehicle speed is slower than a predetermined speed and the engine RPM is faster than a predetermined RPM; and an engine control portion reducing the output torque of the engine according to the torque reduction demanded by the traction control portion such that a torque applied to the drive shaft is smaller than a limit torque, wherein the engine control portion lags ignition timing or reduces fuel injection amount for reducing the output torque of the engine.