US Patent No: 6,427,437
Number of patents in Portfolio can not be more than 2000
Method for improved performance of an engine emission control system
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Aug 6, 2002
Issued date -
Mar 17, 2000
filing date -
09/528,215
serial no -
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Abstract
An engine control system of an internal combustion engine coupled to a NOx trap uses a integrated difference between NOx exiting the trap and NOx entering the trap to determine NOx storage capacity. NOx exiting the trap is measured by a NOx sensor downstream of the trap. NOx entering the trap is determined based on engine operating conditions. The values are integrated until the ratio of NOx exiting to NOx entering reaches a predetermined threshold.
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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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| 4,964,272 Air-fuel ratio feedback control system including at least downstreamside air-fuel ratio sensor | 56 | 1988 | |
| 5,088,281 Method and apparatus for determining deterioration of three-way catalysts in double air-fuel ratio sensor system | 78 | 1989 | |
| 5,270,024 Process for reducing nitrogen oxides from exhaust gas | 89 | 1990 | |
| 5,331,809 Exhaust gas purification system for an internal combustion engine | 86 | 1990 | |
| 5,189,876 Exhaust gas purification system for an internal combustion engine | 93 | 1991 | |
| 5,233,830 Exhaust gas purification system for an internal combustion engine | 93 | 1991 | |
| 5,174,111 Exhaust gas purification system for an internal combustion engine | 75 | 1991 | |
| 5,165,230 Apparatus for determining deterioration of three-way catalyst of internal combustion engine | 67 | 1991 | |
| 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 | 155 | 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 | 100 | 1994 | |
| 5,472,673 Exhaust gas purification device for an engine | 102 | 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 | 104 | 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 | |
| 5,974,793 Exhaust gas purification device for an internal combustion engine | 104 | 1997 | |
| 5,752,492 Apparatus for controlling the air-fuel ratio in an internal combustion engine | 65 | 1997 | |
| 5,996,338 Exhaust gas purifying device for engine | 80 | 1997 | |
| 5,974,791 Exhaust gas purification device for an internal combustion engine | 186 | 1998 | |
| 5,865,027 Device for determining the abnormal degree of deterioration of a catalyst | 60 | 1998 | |
| 6,058,700 Device for purifying exhaust gas of engine | 99 | 1998 | |
| 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 | |
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| 5,341,643 Feedback control system | 11 | 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 | 109 | 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 | 101 | 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 | |
| 6,023,929 Engine with cylinder deactivation | 154 | 1998 | |
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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 | |
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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 | |
| 6,167,695 Method and system for diagnosing deterioration of NOx catalyst | 30 | 1999 | |
| 6,263,666 Exhaust emission control device for internal combustion engine | 28 | 2000 | |
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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 | |
| 6,134,883 Method of controlling an engine exhaust gas system and method of detecting deterioration of catalyst/adsorbing means | 64 | 1999 | |
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| 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 | |
| 6,309,536 Method and apparatus for detecting a functional condition on an NOx occlusion catalyst | 13 | 1998 | |
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| 4,251,989 Air-fuel ratio control system | 92 | 1979 | |
| 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 | |
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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 | |
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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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| 5,267,439 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 | |
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| 5,938,715 Method for monitoring the conversion capacity of a catalytic converter | 76 | 1998 | |
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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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| 5,792,436 Method for using a regenerable catalyzed trap | 87 | 1996 | |
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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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| 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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| 5,410,873 Apparatus for diminishing nitrogen oxides | 94 | 1993 | |
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| 6,173,568 Method and device for operating an internal combustion engine operating with an excess of air | 26 | 1998 | |
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| 5,272,871 Method and apparatus for reducing nitrogen oxides from internal combustion engine | 146 | 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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| 5,842,340 Method for controlling the level of oxygen stored by a catalyst within a catalytic converter | 122 | 1997 | |
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| 5,992,142 No exhaust emission control method and arrangement | 81 | 1999 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Feb 6, 2014 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |