Engine output control system for vehicle

An engine output control system for a vehicle comprising a slip detecting means which detects a degree of slip driving wheels of the vehicle, an engine output reduction determining means which determines engine output reduction requirement by which the output of the engine is to be reduced in order to converge the degree of slip of the driving wheels on a target value according to the degree of slip of the driving wheels detected by the slip detecting means so that the engine output reduction requirement is larger when the slip is large than when the slip is small, an engine output reducing means which reduces the output of the engine by the engine output reduction requirement determined by the engine output reduction determining means so that the output of the engine is more reduced when the engine output reduction requirement is large than when the engine output reduction requirement is small, an engine speed detecting means which detects the engine speed, an engine output reduction inhibiting means which inhibits reduction of the engine output when the engine speed is lower than a preset engine speed, a preset engine speed changing means which changes the preset engine speed according to the engine output reduction requirement so that the preset engine speed is higher when the engine output reduction requirement is large than when the engine output reduction requirement is small.