US Patent No: 6,467,259
Number of patents in Portfolio can not be more than 2000
Method and system for operating dual-exhaust engine
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Oct 22, 2002
Issued date -
Jun 19, 2001
filing date -
09/884,563
serial no -
In Force
status
Importance
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Abstract
An exhaust gas treatment system for an internal combustion engine includes a pair of upstream emission control devices which respectively receive the exhaust gas generated by a respective group of cylinders, and a single, shared downstream emission control device receiving catalyzed exhaust gas from each of the upstream emission control devices. After the downstream device stores a selected constituent gas generated when each cylinder group is operating "lean," the downstream device is purged by operating the first cylinder group with a stoichiometric air-fuel mixture while operating the second cylinder group with a rich air-fuel mixture, such that the combined catalyzed exhaust gas flowing through the downstream device during the purge event has an air-fuel ratio slightly rich of stoichiometry. As a result, the invention improves overall vehicle fuel economy because only one of the upstream devices is purged of stored oxygen when purging the downstream device of previously-stored constituent gas.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,088,281 Method and apparatus for determining deterioration of three-way catalysts in double air-fuel ratio sensor system | 78 | 1989 | |
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| 5,233,830 Exhaust gas purification system for an internal combustion engine | 93 | 1991 | |
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| 5,201,802 Exhaust gas purification system for an internal combustion engine | 125 | 1992 | |
| 5,209,061 Exhaust gas purification system for an internal combustion engine | 81 | 1992 | |
| 5,412,946 NOx decreasing apparatus for an internal combustion engine | 149 | 1992 | |
| 5,473,887 Exhaust purification device of internal combustion engine | 154 | 1993 | |
| 5,402,641 Exhaust gas purification apparatus for an internal combustion engine | 127 | 1993 | |
| 5,433,074 Exhaust gas purification device for an engine | 82 | 1993 | |
| 5,412,945 Exhaust purification device of an internal combustion engine | 86 | 1993 | |
| 5,423,181 Exhaust gas purification device of an engine | 69 | 1993 | |
| 5,377,484 Device for detecting deterioration of a catalytic converter for an engine | 85 | 1993 | |
| 5,437,153 Exhaust purification device of internal combustion engine | 129 | 1994 | |
| 5,450,722 Exhaust purification device of internal combustion engine | 68 | 1994 | |
| 5,448,887 Exhaust gas purification device for an engine | 80 | 1994 | |
| 5,473,890 Exhaust purification device of internal combustion engine | 107 | 1994 | |
| 5,483,795 Exhaust purification device of internal combustion engine | 99 | 1994 | |
| 5,472,673 Exhaust gas purification device for an engine | 101 | 1994 | |
| 5,551,231 Engine exhaust gas purification device | 96 | 1994 | |
| 5,577,382 Exhaust purification device of internal combustion engine | 89 | 1995 | |
| 5,746,052 Exhaust gas purification device for an engine | 86 | 1995 | |
| 5,740,669 Exhaust gas purification device for an engine | 90 | 1995 | |
| 5,732,554 Exhaust gas purification device for an internal combustion engine | 103 | 1996 | |
| 5,715,679 Exhaust purification device of an engine | 83 | 1996 | |
| 5,735,119 Exhaust purification device of an engine | 78 | 1996 | |
| 5,713,199 Device for detecting deterioration of NO.sub.x absorbent | 97 | 1996 | |
| 5,743,086 Device for judging deterioration of catalyst of engine | 26 | 1996 | |
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| 5,934,072 Exhaust gas purifying device for engine | 32 | 1998 | |
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| 5,974,794 Exhaust gas purification device for an internal combustion engine | 38 | 1998 | |
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| 6,014,859 Device for purifying exhaust gas of engine | 112 | 1998 | |
| 5,970,707 Exhaust gas purification device for an internal combustion engine | 93 | 1998 | |
| 6,138,453 Exhaust gas purification device for an internal combustion engine | 46 | 1998 | |
| 6,205,773 Exhaust gas purification device for an internal combustion engine | 42 | 1999 | |
| 6,250,074 Air-fuel ratio control apparatus and method of internal combustion engine | 15 | 2000 | |
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| 5,359,852 Air fuel ratio feedback control | 41 | 1993 | |
| 5,419,122 Detection of catalytic converter operability by light-off time determination | 79 | 1993 | |
| 5,414,994 Method and apparatus to limit a midbed temperature of a catalytic converter | 123 | 1994 | |
| 5,626,117 Electronic ignition system with modulated cylinder-to-cylinder timing | 66 | 1994 | |
| 5,452,576 Air/fuel control with on-board emission measurement | 93 | 1994 | |
| 5,626,014 Catalyst monitor based on a thermal power model | 108 | 1995 | |
| 5,598,703 Air/fuel control system for an internal combustion engine | 62 | 1995 | |
| 5,743,084 Method for monitoring the performance of a no.sub.x trap | 101 | 1996 | |
| 5,771,685 Method for monitoring the performance of a NO.sub.x trap | 108 | 1996 | |
| 5,722,236 Adaptive exhaust temperature estimation and control | 99 | 1996 | |
| 5,746,049 Method and apparatus for estimating and controlling no x trap temperature | 82 | 1996 | |
| 5,832,722 Method and apparatus for maintaining catalyst efficiency of a NO.sub.x trap | 93 | 1997 | |
| 5,778,666 Method and apparatus for improving engine fuel economy | 100 | 1997 | |
| 5,974,788 Method and apparatus for desulfating a no.sub.x trap | 151 | 1997 | |
| 5,983,627 Closed loop control for desulfating a NO.sub.x trap | 89 | 1997 | |
| 5,910,096 Temperature control system for emission device coupled to direct injection engines | 49 | 1997 | |
| 5,877,413 Sensor calibration for catalyst deterioration detection | 29 | 1998 | |
| 6,023,929 Engine with cylinder deactivation | 154 | 1998 | |
| 6,079,204 Torque control for direct injected engines using a supplemental torque apparatus | 52 | 1998 | |
| 6,199,373 Method and apparatus for desulfating a NOx trap | 39 | 1999 | |
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| 5,325,664 System for determining deterioration of catalysts of internal combustion engines | 100 | 1992 | |
| 5,544,482 Exhaust gas-purifying system for internal combustion engines | 78 | 1995 | |
| 5,803,048 System and method for controlling air-fuel ratio in internal combustion engine | 63 | 1995 | |
| 5,655,363 Air-fuel ratio control system for internal combustion engines | 74 | 1995 | |
| 5,724,808 Air-fuel ratio control system for internal combustion engines | 79 | 1996 | |
| 6,012,428 Method for controlling air-fuel ratio in internal combustion engine | 67 | 1997 | |
| 5,966,930 Catalyst deterioration-determining system for internal combustion engines | 45 | 1997 | |
| 6,003,308 Air-fuel ratio control system for internal combustion engines | 30 | 1997 | |
| 6,092,369 Catalyst deterioration-determining system for internal combustion engines using compressed natural gas | 26 | 1998 | |
| 6,128,899 Exhaust gas purification system for internal combustion engine | 38 | 1999 | |
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| 5,009,210 Air/fuel ratio feedback control system for lean combustion engine | 66 | 1987 | |
| 4,913,122 Air-fuel ratio control system | 71 | 1988 | |
| 5,729,971 Engine catalyst temperature estimating device and catalyst diagnostic device | 35 | 1996 | |
| 6,101,809 Exhaust gas purifying system of internal combustion engine | 32 | 1998 | |
| 6,148,611 Engine air-fuel ratio controller and control method | 28 | 1999 | |
| 6,237,330 Exhaust purification device for internal combustion engine | 89 | 1999 | |
| 6,145,305 System and method for diagnosing deterioration of NOx-occluded catalyst | 25 | 1999 | |
| 6,233,923 Exhaust emission control device of internal combustion engine | 25 | 2000 | |
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| 5,693,877 Evaluating method for NO.sub.x eliminating catalyst, an evaluating apparatus therefor, and an efficiency controlling method therefor | 76 | 1994 | |
| 5,802,843 Method and apparatus for diagnosing engine exhaust gas purification system | 72 | 1995 | |
| 5,617,722 Exhaust control device of internal combustion engine | 29 | 1995 | |
| 5,867,983 Control system for internal combustion engine with enhancement of purification performance of catalytic converter | 31 | 1996 | |
| 5,813,387 Change gear control device using acceleration and gear ratio as parameters for automatic transmission in a motor vehicle and the method therefor | 21 | 1996 | |
| 5,979,404 Output torque control apparatus and method for an internal combustion engine | 24 | 1997 | |
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| 5,267,439 Method and arrangement for checking the aging condition of a catalyzer | 62 | 1991 | |
| 5,335,538 Method and arrangement for determining the storage capacity of a catalytic converter | 92 | 1992 | |
| 6,119,449 Internal combustion engine and method of operating the same | 28 | 1998 | |
| 6,216,448 Method of diagnosing an NOX storage catalytic converter during operation of an internal combustion engine | 40 | 1999 | |
| 6,216,451 Method of diagnosing an NOx storage catalytic converter during operation of an internal combustion engine | 30 | 1999 | |
| 6,161,428 Method and apparatus for evaluating the conversion capability of a catalytic converter | 26 | 1999 | |
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| 4,251,989 Air-fuel ratio control system | 92 | 1979 | |
| 4,677,955 Method and apparatus for discriminating operativeness/inoperativeness of an air-fuel ratio sensor | 26 | 1985 | |
| 5,097,700 Apparatus for judging catalyst of catalytic converter in internal combustion engine | 76 | 1991 | |
| 5,622,047 Method and apparatus for detecting saturation gas amount absorbed by catalytic converter | 67 | 1994 | |
| 5,806,306 Deterioration monitoring apparatus for an exhaust system of an internal combustion engine | 20 | 1996 | |
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| 5,953,907 Method of controlling an engine exhaust gas system and method of detecting deterioration of catalyst/adsorbing means | 53 | 1997 | |
| 6,012,282 Method for controlling engine exhaust gas system | 51 | 1997 | |
| 6,026,640 Method of controlling an engine exhaust gas system and method of detecting deterioration of catalyst/adsorbing means | 34 | 1999 | |
| 6,134,883 Method of controlling an engine exhaust gas system and method of detecting deterioration of catalyst/adsorbing means | 64 | 1999 | |
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| 5,862,661 Method for monitoring catalytic converter efficiency | 23 | 1997 | |
| 5,938,715 Method for monitoring the conversion capacity of a catalytic converter | 75 | 1998 | |
| 6,145,302 Method for monitoring a catalytic converter | 44 | 1998 | |
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| 6,073,440 System for detecting deterioration of catalyst for purifying exhaust gas | 40 | 1997 | |
| 6,148,612 Engine exhaust gas control system having NOx catalyst | 39 | 1998 | |
| 6,244,046 Engine exhaust purification system and method having NOx occluding and reducing catalyst | 47 | 1999 | |
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| 5,792,436 Method for using a regenerable catalyzed trap | 87 | 1996 | |
| 6,105,365 Apparatus, method, and system for concentrating adsorbable pollutants and abatement thereof | 91 | 1997 | |
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| 4,884,066 Deterioration detector system for catalyst in use for emission gas purifier | 77 | 1987 | |
| 5,357,750 Method for detecting deterioration of catalyst and measuring conversion efficiency thereof with an air/fuel ratio sensor | 66 | 1993 | |
| 6,214,207 Method and apparatus for measuring oxygen concentration and nitrogen oxide concentration | 39 | 1997 | |
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| 5,595,060 Apparatus and method for internal-combustion engine control | 117 | 1995 | |
| 5,657,625 Apparatus and method for internal combustion engine control | 156 | 1995 | |
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| 5,842,339 Method for monitoring the performance of a catalytic converter | 47 | 1997 | |
| 5,842,340 Method for controlling the level of oxygen stored by a catalyst within a catalytic converter | 122 | 1997 | |
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| 6,164,064 Method and arrangement for desulfurization of NOx reservoir catalysts | 30 | 1998 | |
| 5,992,142 No exhaust emission control method and arrangement | 80 | 1999 | |
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| 6,189,523 Method and system for controlling an air-to-fuel ratio in a non-stoichiometric power governed gaseous-fueled stationary internal combustion engine | 36 | 1999 | |
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| 4,533,900 Service-interval display for motor vehicles | 76 | 1982 | |
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| 5,771,686 Method and apparatus for operating a diesel engine | 104 | 1996 | |
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| 4,622,809 Method and apparatus for monitoring and adjusting .lambda.-probe-controlled catalytic exhaust gas emission control systems of internal combustion engines | 113 | 1985 | |
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| 5,831,267 Method and apparatus for remote measurement of exhaust gas | 64 | 1997 | |
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| 6,202,406 Method and apparatus for catalyst temperature control | 38 | 1999 | |
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| 6,092,021 Fuel use efficiency system for a vehicle for assisting the driver to improve fuel economy | 78 | 1997 | |
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| 5,554,269 No.sub.x sensor using electrochemical reactions and differential pulse voltammetry (DPV) | 30 | 1995 | |
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| 5,426,934 Engine and emission monitoring and control system utilizing gas sensors | 87 | 1993 | |
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| 6,161,378 Exhaust gas purification apparatus of internal combustion engine and catalyst for purifying exhaust gas internal combustion engine | 49 | 1998 | |
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| 5,929,320 Apparatus and method for judging deterioration of catalysts device and oxygen content sensing device | 24 | 1996 | |
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| 5,410,873 Apparatus for diminishing nitrogen oxides | 94 | 1993 | |
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| 5,272,871 Method and apparatus for reducing nitrogen oxides from internal combustion engine | 139 | 1992 | |
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| 5,222,471 Emission control system for an internal combustion engine | 65 | 1992 | |
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| 4,854,123 Method for removal of nitrogen oxides from exhaust gas of diesel engine | 99 | 1988 | |
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| 5,448,886 Catalyst deterioration-determining device for an internal combustion engine | 24 | 1993 | |
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| 6,102,019 Advanced intelligent fuel control system | 21 | 1999 | |
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| 4,186,296 Vehicle energy conservation indicating device and process for use | 18 | 1977 | |
| 5,569,848 System, method and apparatus for monitoring tire inflation pressure in a vehicle tire and wheel assembly | 77 | 1995 | |
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