Stable Speed Control for a vehicle

摘要

The invention provides a method of operating a motor vehicle equipped with a powertrain, comprising the steps of: detecting if the motor vehicle is requested to move under a stable speed condition 600, and performing an operating strategy, if the request is detected. This operating strategy 625 comprising the steps of de­termining a mean value of the motor vehicle speed to be obtained during the stable speed condition, setting an allowable range of speed values around the determined mean value, and repeatedly performing a control cycle that operates the powertrain to accelerate the motor vehicle, until the motor vehicle speed increases to an upper limit of the allowable range of speed values. Then preventing the power-train from providing traction to the motor vehicle by operating a clutch to disengage the engine and allowing the vehicle to freewheel until the speed of the motor vehicle decreases from the upper limit to a lower limit of the al­lowable range of speed values.