VORRICHTUNG UND VERFAHREN ZUR STEUERUNG EINER ABGASRUECKFUEHRUNG

摘要

An apparatus for controlling the exhaust-gas recirculation cycling of an engine includes an exhaust-gas recirculation passage connected at one end to an intake passage and at the other end to an exhaust passage. An exhaust-gas recirculation valve is provided in the recirculation passage to open and close it. The valve is coupled to an actuator having a pressure chamber and moved in accordance with the pressure within the chamber. The chamber communicates with first and second pressure sources through a solenoid valve. In order to move the recirculation valve to a desired position from the present position, the solenoid valve is controlled by a control device such that the first and second pressure sources are alternately connected to the pressure chamber when the distance between the present and desired positions is small, and such that the first or second pressure source is continuously connected to the pressure chamber when the distance between the present and desired positions is large.