METHOD AND SYSTEM FOR AUTOMATIC FREEWHEELING OF VEHICLE

摘要

A method and a system for automatic freewheeling of a vehicle, where in the vehicle are arranged speed­lowering means, an engine (1), a wheel driven by the engine (1) via an automated stage-geared gearbox (9), a gas pedal (48) for regulating the driving torque of the engine, and a control unit (45). The control unit (45) is arranged to, when the freewheel function is activated and in the presence of an input signal indicating that a predetermined vehicle speed limit (vm,,) is exceeded, to automatically deactivate the freewheel function and brake the vehicle with speed­lowering means. The control unit (45) is arranged to reactivate the freewheel function in the presence of an input signal indicating that the vehicle speed (v) has fallen to close to the predetermined vehicle speed limit (vm.). According to one embodiment, the future progression of the vehicle is simulated with a view to optimizing the freewheel function in terms of good fuel economy and/or increased comfort.