Exhaust gas re-circulation device for an internal combustion engine

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(11)

EP 1 136 688 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	12.06.2002 Bulletin 2002/24

(43)	Date of publication A2:
	26.09.2001 Bulletin 2001/39

(21)	Application number: 01104948.3

(22)	Date of filing: 28.02.2001

(51)	International Patent Classification (IPC)⁷: F02M 25/07

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

22.03.2000 LU 90551

(71)	Applicant: Delphi Technologies, Inc.
	Troy, MI 48007 (US)

(72)	Inventors:
	Mafrica, Sébastien L. 6750 Mussy-La-Ville (BE) Vanormelingen, Herman J. 4950 Bascharage (LU) Kanters, Gertjan J.M. 8447 Steinfort (LU)

(74)	Representative: Schmitt, Armand et al
	Office Ernest T. Freylinger S.A., B.P. 48 8001 Strassen 8001 Strassen (LU)

(54)	Exhaust gas re-circulation device for an internal combustion engine

(57) An exhaust gas re-circulation device for an internal combustion engine comprises an intake air channel (2), an intake air control valve (18), an exhaust gas re-circulation valve (12) and an actuator (22), a first motion transmission mechanism between the actuator (22) and the exhaust gas re-circulation valve (12) and a second motion transmission mechanism between the actuator (22) and the intake air control valve (18). A first uncoupling means (26) is included in the first motion transmission mechanism and a first pull-back spring (34) biases the exhaust gas re-circulation valve (12) in a closed position. The device enables to control exhaust gas re-circulation rates by simultaneously driving the two valves in opposite senses and to obtain a smooth engine shut-off, by simultaneously closing the two valves. In a preferred embodiment, with a second uncoupling means (50) in the second motion transmission mechanism and a second pull-back spring (52) biasing the intake air control valve (18) in an open position, low exhaust gas re-circulation rates can be controlled with the intake air control valve (18) fully open.

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