Control systems for vehicle engines

A control system for a vehicle engine comprising:

• first detecting means for detecting a controlled change of position of an accelerator from a reference position, said accelerator being operatively connected with the vehicle engine,
• engine output adjusting means for controlling an engine output of the vehicle engine, said engine output including torque and/or rotational velocity of an output shaft,
• second detecting means for detecting a condition wherein a vehicle in which the vehicle engine is employed is travelling in a traffic jam situation, and
• controlling means for determining a first drive signal value for said engine output adjusting means based on a detection output of said first detecting means to actuate said engine output adjusting means in accordance with said first drive signal value when the condition wherein the vehicle is travelling in the traffic jam situation is not detected by the second detecting means, and for determining a second drive signal value for said engine output adjusting means which is smaller than said first drive signal value based on the detection output of said first detecting means to actuate said engine output adjusting means in accordance with said second drive signal value when the condition wherein the vehicle is travelling in the traffic jam situation is detected by the second detecting means, so as to cause the vehicle engine to have the engine output adjusted in accordance with the controlled change in position of said accelerator detected by said first detecting means.