Constant-speed cruise control apparatus for a vehicle

摘要: The invention relates to a constant-speed cruise control apparatus for automatically controlling the speed of vehicle permit at constant speed. gradient road is estimated on basis an actual vehicle, opening throttle valve, and performance characteristics which indicates relationship between valve. If it determines that uphill, moreover, absolute value deviation (i.e., froma target speed) more than predetermined value, shifting down carried out. Subsequently, if less another determined downhill, up Through such shift-up shift-down both gradient, possible perform change according conditions surface road, thereby carrying out highly reliable vehicle.