Method to control fuel vapor purging

Details Method to control fuel vapor purging Method to control fuel vapor purging

2002-06-04

2004-04-06

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

C123S520000, C123S481000

Reexamination Certificate

active

06715462

ABSTRACT:

BACKGROUND OF INVENTION
1. Field of the Invention
The field of the invention relates generally to engine control systems utilizing fuel vapor purging.
2. Background of the Invention
Engine control systems utilize fuel vapor purging to reduce emissions from the vehicle. In these systems, vapors are inducted into the engine intake manifold, and then into the engine cylinders to be burned.
The inventors herein have developed an engine control methodology that allows efficient engine operation with some of the cylinders inducting air with no injected fuel. However, the inventors have also recognized that if fuel vapors are inducted into the engine manifold, some fuel vapor will enter these non-combusting cylinders and pass to the exhaust unburned. As such, if the exhaust system is at a high temperature, the exhaust system may become too hot. Alternatively, if the exhaust system is not at a high temperature, then vapors may pass through the exhaust unburned, thereby increasing engine emissions.
SUMMARY OF THE INVENTION
Various of the above problems can be reduced by operation according to a method having a first and second group of cylinders, operating in a first mode wherein the first cylinder group operates with air and substantially no injected fuel and the second cylinder group operates by combusting air and injected fuel, providing a request for fuel vapor purging, and in response to the request, disabling the first mode of operation and operating the engine in a second mode of operation. By disabling the first mode, it is possible to operate in another mode that can more efficiently burn the inducted fuel vapors.
In another aspect of the present invention, the method comprises combusted air and injected fuel in the second group near stoichiometry.
By allowing fuel vapor purging in said first mode when the exhaust temperature is within a predetermined range, it is possible to react the fuel vapors with excess oxygen over the catalyst. However, if this causes the temperature to move outside the range, the engine can be transitioned to a second mode that allows burning of the fuel vapors with increasing exhaust gas temperature.


REFERENCES:
patent: 3696318 (1972-10-01), Boyd et al.
patent: 3696618 (1972-10-01), Boyd et al.
patent: 3969932 (1976-07-01), Rieger et al.
patent: 4033122 (1977-07-01), Masaki et al.
patent: 4036014 (1977-07-01), Ariga
patent: 4178883 (1979-12-01), Herth
patent: 4207855 (1980-06-01), Phillips
patent: 4251989 (1981-02-01), Norimatsu et al.
patent: 4622809 (1986-11-01), Abthoff et al.
patent: 4854123 (1989-08-01), Inoue et al.
patent: 4884066 (1989-11-01), Miyata et al.
patent: 4913122 (1990-04-01), Uchida et al.
patent: 4964272 (1990-10-01), Kayanuma
patent: 5009210 (1991-04-01), Nakagawa et al.
patent: 5088281 (1992-02-01), Izutani et al.
patent: 5097700 (1992-03-01), Nakane
patent: 5165230 (1992-11-01), Kayanuma et al.
patent: 5174111 (1992-12-01), Nomura et al.
patent: 5179924 (1993-01-01), Manaka
patent: 5189876 (1993-03-01), Hirota et al.
patent: 5201802 (1993-04-01), Hirota et al.
patent: 5209061 (1993-05-01), Takeshima
patent: 5222471 (1993-06-01), Stueven
patent: 5233830 (1993-08-01), Takeshima et al.
patent: 5267439 (1993-12-01), Raff et al.
patent: 5270024 (1993-12-01), Kasahara et al.
patent: 5272871 (1993-12-01), Oshima et al.
patent: 5325664 (1994-07-01), Seki et al.
patent: 5331809 (1994-07-01), Takeshima et al.
patent: 5335538 (1994-08-01), Blischke et al.
patent: 5357750 (1994-10-01), Ito et al.
patent: 5377484 (1995-01-01), Shimizu
patent: 5402641 (1995-04-01), Katoh et al.
patent: 5410873 (1995-05-01), Tashiro
patent: 5412945 (1995-05-01), Katoh et al.
patent: 5412946 (1995-05-01), Oshima et al.
patent: 5414994 (1995-05-01), Cullen et al.
patent: 5419122 (1995-05-01), Tabe et al.
patent: 5423181 (1995-06-01), Katoh et al.
patent: 5433074 (1995-07-01), Seto et al.
patent: 5437153 (1995-08-01), Takeshima et al.
patent: 5437253 (1995-08-01), Huffmaster et al.
patent: 5448887 (1995-09-01), Takeshima
patent: 5450722 (1995-09-01), Takeshima et al.
patent: 5452576 (1995-09-01), Hamburg et al.
patent: 5472673 (1995-12-01), Goto et al.
patent: 5473887 (1995-12-01), Takeshima et al.
patent: 5473890 (1995-12-01), Takeshima et al.
patent: 5479898 (1996-01-01), Cullen et al.
patent: 5483795 (1996-01-01), Katoh et al.
patent: 5483941 (1996-01-01), Cullen et al.
patent: 5497745 (1996-03-01), Cullen et al.
patent: 5544482 (1996-08-01), Matsumoto et al.
patent: 5551231 (1996-09-01), Tanaka et al.
patent: 5577382 (1996-11-01), Kihara et al.
patent: 5595060 (1997-01-01), Togai et al.
patent: 5598703 (1997-02-01), Hamburg et al.
patent: 5622047 (1997-04-01), Yamashita et al.
patent: 5626014 (1997-05-01), Hepburn et al.
patent: 5626117 (1997-05-01), Wright et al.
patent: 5628299 (1997-05-01), Marzonia et al.
patent: 5655363 (1997-08-01), Ito et al.
patent: 5657625 (1997-08-01), Koga et al.
patent: 5672817 (1997-09-01), Sagisaka et al.
patent: 5693877 (1997-12-01), Ohsuga et al.
patent: 5492094 (1998-02-01), Cullen et al.
patent: 5713199 (1998-02-01), Takeshima et al.
patent: 5715679 (1998-02-01), Asanuma et al.
patent: 5722236 (1998-03-01), Cullen et al.
patent: 5724808 (1998-03-01), Ito et al.
patent: 5732554 (1998-03-01), Sasaki et al.
patent: 5735119 (1998-04-01), Asanuma et al.
patent: 5740669 (1998-04-01), Kinugasa et al.
patent: 5743084 (1998-04-01), Hepburn
patent: 5746049 (1998-05-01), Cullen et al.
patent: 5746052 (1998-05-01), Kinugasa et al.
patent: 5752492 (1998-05-01), Kato et al.
patent: 5771685 (1998-06-01), Hepburn
patent: 5771686 (1998-06-01), Pischinger et al.
patent: 5778666 (1998-07-01), Cullen et al.
patent: 5792436 (1998-08-01), Feeley et al.
patent: 5802843 (1998-09-01), Kurihara et al.
patent: 5803048 (1998-09-01), Yano et al.
patent: 5832722 (1998-11-01), Cullen et al.
patent: 5842340 (1998-12-01), Bush et al.
patent: 5865027 (1999-02-01), Hanafusa et al.
patent: 5938715 (1999-08-01), Zhang et al.
patent: 5950603 (1999-09-01), Cook et al.
patent: 5970707 (1999-10-01), Sawada et al.
patent: 5974788 (1999-11-01), Hepburn et al.
patent: 5974791 (1999-11-01), Hirota et al.
patent: 5974793 (1999-11-01), Kinugasa et al.
patent: 5983627 (1999-11-01), Asik
patent: 5992142 (1999-11-01), Pott
patent: 5996338 (1999-12-01), Hirota
patent: 6012428 (2000-01-01), Yano et al.
patent: 6014859 (2000-01-01), Yoshizaki et al.
patent: 6023929 (2000-02-01), Ma
patent: 6058700 (2000-05-01), Yamashita et al.
patent: 6116213 (2000-09-01), Yasui et al.
patent: 6189316 (2001-02-01), Surnilla et al.
patent: 6244242 (2001-06-01), Grizzle et al.
patent: 6324835 (2001-12-01), Surnilla et al.
patent: 6327850 (2001-12-01), Yasui et al.
patent: 6360713 (2002-03-01), Kolmanovsky et al.
patent: 6505464 (2003-01-01), Isobe et al.
patent: 6539784 (2003-04-01), King et al.
patent: 6615804 (2003-09-01), Matthews et al.
patent: 2003/0221664 (2003-12-01), Surnilla
patent: 196 07 151 (1997-07-01), None
patent: 0 351 197 (1990-01-01), None
patent: 0 444 783 (1991-09-01), None
patent: 0 503 882 (1992-09-01), None
patent: 0 580 389 (1994-01-01), None
patent: 2056556 (1981-03-01), None
patent: 55-29002 (1980-03-01), None
patent: 55-49549 (1980-04-01), None
patent: 62-97630 (1987-05-01), None
patent: 62-117620 (1987-05-01), None
patent: 64-53042 (1989-03-01), None
patent: 2-30915 (1990-02-01), None
patent: 2-33408 (1990-02-01), None
patent: 2-207159 (1990-08-01), None
patent: 3-135417 (1991-06-01), None
patent: 5-26080 (1993-02-01), None
patent: 5-106493 (1993-04-01), None
patent: 5-106494 (1993-04-01), None
patent: 6-58139 (1994-03-01), None
patent: 6-264787 (1994-09-01), None
patent: 7-97941 (1995-04-01), None
patent: 7-166851 (1995-06-01), None
patent: 98/27322 (1998-06-01), None
Joe Theis et al, “An Air/Fuel Algorithm To Improve The NOx Conversion Of Copper-Based Catalysts”, SAE Technical Paper No. 922251, Oct. 19-22, 1992, pp. 77-89.
Y. Kaneko et al, “Effect of Air-Fuel Ratio Modulation on Conversion Efficiency of Three-Way Catalysts”, Inter-Industry Emission Control Program 2 (IIEC-2) Progress Report No. 4, SAE Technical Paper No. 780607, Jun. 5-9, 1978, pp. 119-127.
Alan

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