Steering control system for vehicle

A steering control system for a vehicle, comprising:

• an electric motor for steering a wheel,
• a steering amount detecting means for detecting the steering amount provided by a driver's steering operation,
• a vehicle speed detecting means for detecting the vehicle speed,
• an operational state detecting means for detecting the operational state of said electric motor,
• a first control means for controlling said electric motor on the basis of said steering amount, said vehicle speed and said operational state,
• wherein said steering control system further includes a second control means for controlling said first control means,
• wherein said first control means is capable of controlling said electric motor on the basis of inputs of the actual steering amount, the actual vehicle speed and the actual operational state, and
• wherein said second control means is provided separately from and is connectable to the control system for the vehicle and produces at least one of a modified steering amount based upon the actual steering amount and a modified vehicle speed based upon the actual vehicle speed, and substitutes at least one of the modified steering amount and the modified vehicle speed for the actual steering amount and the actual vehicle speed for the inputs of the first control means.