US5570575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel delivery control apparatus for use with internal combustion engine
Assignee: Nissan Motor Co Ltd
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Filing: 1994-10-05
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Granted: 1996-11-05
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Expires: 2014-10-05
Abstract
Abstract A fuel delivery control apparatus for use with an internal combustion engine including an exhaust system having a catalytic converter containing catalysts operable at a temperature for purifying exhaust gases discharged through the exhaust system. A fuelcut control is performed to interrupt fuel delivery to the engine during engine deceleration. The fuelcut control is inhibited when the catalyst temperature exceeds a predetermined value.
Inventors
- 👤 Ritsuo Sato
- 👤 Kimiyoshi Nishizawa
- 👤 Fuminori Yamanashi
- 👤 Katsuhiro Shibata
- 👤 Hideharu Ehara
- 👤 Kaoru Ikeda
- 👤 Keiji Yakushiji
- 👤 Ken Ouchi
- 👤 Kiyotaka Baba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:52
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/021; F02D41/0235; F02D41/04; F02D41/12; F02D41/123; F02D2200/00; F02D2200/02; F02D2200/08; F02D2200/0802; F02D2200/0804; F02D2200/50; F02D2200/501
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
A fuel delivery control apparatus for use with an internal combustion engine including an exhaust system having a catalytic converter containing catalysts operable at a temperature for purifying exhaust gases discharged through the exhaust system, comprising: means for performing fuelcut control to interrupt fuel delivery to the engine during engine deceleration; means for estimating the catalyst temperature; means for inhibiting the fuelcut control when the estimated catalyst temperature exceeds a predetermined value; and means for maintaining the fuelcut control inhibited as long as the engine deceleration continues.
Claim 2
Dependent Claim
87 words
A fuel delivery control apparatus for use with an internal combustion engine including an exhaust system having a catalytic converter containing catalysts operable at a temperature for purifying exhaust gases discharged through the exhaust system, comprising: means for performing fuelcut control to interrupt fuel delivery to the engine during engine deceleration; means for estimating the catalyst temperature; means for inhibiting the fuelcut control when the estimated catalyst temperature exceeds a predetermined value; and means for maintaining the fuelcut control inhibited as long as the engine deceleration continues.
Claim 3
Dependent Claim
92 words
The fuel delivery control apparatus as claimed in claim 1, further including: means for detecting engine operating conditions; means for performing fuel enrichment control to supply an increased amount of fuel to the engine when the detected engine operating conditions are in a region specified for fuel enrichment control; means for measuring a period of time during which the fuel enrichment control is performed when the estimated catalyst temperature exceeds the predetermined value; and means for releasing the inhibition of the fuelcut control when the measured time period exceeds a predetermined value.
Claim 4
Dependent Claim
122 words
The fuel delivery control apparatus as claimed in claim 1, further including: means for detecting engine operating conditions; means for performing fuel enrichment control to supply an increased amount of fuel to the engine when the detected engine operating conditions are in a region specified for fuel enrichment control; means for measuring a fuel amount increased during which the fuel enrichment control is performed when the estimated catalyst temperature exceeds the predetermined value; means for measuring a fuel amount decreased during which the fuelcut control is performed when the estimated catalyst temperature exceeds the predetermined value; and means for releasing the inhibition of the fuelcut control when the measured increased fuel amount minus the measured decreased fuel amount exceeds a predetermined value.
References Cited (Backward Citations)
US4656829A
Cited
US4729220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-05 | 2000-05-06 | 2000-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-05 | 2004-05-06 | 2004-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-05 | 2008-05-06 | 2008-11-05 | $7700.00 | Window Closed / Lapsed |