Patent ID: 6330873
Filing Date: 2001-12-18
Classification: B60K,B60W,F01P,F02B,F02D,Y02T

Abstract:
A method of controlling the road speed of a vehicle including a multi-cylinder internal combustion engine having means for engine braking, an electronic control unit with memory for controlling the engine, at least one sensor for sensing a vehicle operating parameter from which current vehicle speed can be derived, and means for indicating an overspeed condition, comprising:providing a plurality engine braking levels operable to a effect a plurality of engine braking loads when activated;receiving a first commanded engine braking level from the vehicle operator;sensing the current vehicle speed:determining a second commanded engine braking level by comparing a current vehicle speed with at least one predetermined speed limit;selecting the one of the first or second commanded engine braking levels corresponding to the lesser engine braking load; andactivating the engine brake at the selected engine braking level.