Patent ID: 6269794
Filing Date: 2001-08-07
Classification: F02D,Y02T

Abstract:
A method of stabilizing the idling run of an internal-combustion engine having a crankshaft, a plurality of cylinders each provided with intake and exhaust valves, a piston received for reciprocation in each cylinder and an engine control for variably controlling the intake and exhaust valves, comprising the following steps during the idling run:(a) opening the intake valves at a moment determined as a function of the angular position of the crankshaft and(b) closing the intake valves by the engine control at a moment determined as a function of time, whereby if an actual rpm exceeds a predetermined desired rpm, one part of a charge is returned from the cylinders into respective intake ports and if the actual rpm falls below the predetermined desired rpm, an increase of the charge in the cylinders is effected, without varying the open period between opening and closing moments as defined in steps (a) and (b).