(19)
(11) EP 1 213 468 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.11.2003 Bulletin 2003/48

(43) Date of publication A2:
12.06.2002 Bulletin 2002/24

(21) Application number: 01125970.2

(22) Date of filing: 31.10.2001
(51) International Patent Classification (IPC)7: F02M 25/07, F02D 9/04, F02B 37/22
(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

(30) Priority: 07.12.2000 US 733881

(71) Applicant: Caterpillar Inc.
Peoria Illinois 61629-6490 (US)

(72) Inventors:
  • Lawrence, Keith E., Caterpillar Inc.
    Peoria, Illinois 61629-6490 (US)
  • Pierpont, David A., Caterpillar Inc.
    Peoria, Illinois 61629-6490 (US)
  • Rathman, Carol A., Caterpillar Inc.
    Peoria, Illinois 61629-6490 (US)

(74) Representative: Wagner, Karl H., Dipl.-Ing. 
WAGNER & GEYER Patentanwälte Gewürzmühlstrasse 5
80538 München
80538 München (DE)

   


(54) Open manifold back pressure valve exhaust gas recirculation system


(57) An internal combustion engine exhaust gas recirculation (EGR) system includes an exhaust gas manifold back pressure valve insert assembly which has an exhaust gas recirculation (EGR) conduit interposed exhaust manifold structure of the engine and atmospheric exhaust structure which includes a scroll element of the turbine stage of the engine turbocompressor, and a valve mechanism disposed within the scroll element and movable between a fully closed position at which all exhaust gases from all of the engine cylinders pass to atmospheric exhaust through the atmospheric exhaust structure, and a fully opened position at which the valve mechanism partially occludes an upstream portion of the scroll element such that a sufficiently large back pressure is developed with respect to the atmospheric exhaust structure such that exhaust gases are forced through the exhaust gas recirculation (EGR) conduit.






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