Patent US5148369A successfully refreshed from Google Patents.
US5148369A
Expired / Lapsed
US
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Air-fuel control apparatus for an internal combustion engine
Assignee: Mitsubishi Electric Corp
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Filing: 1991-05-01
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Granted: 1992-09-15
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Expires: 2011-05-01
Abstract
Abstract An air-fuel ratio control apparatus for an internal combustion engine controls a fuel supplying means by a signal generated from an air-fuel sensor so that the air-fuel ratio of a gas mixture to be sucked into the internal combustion engine becoms a target air-fuel ratio. The air-fuel ratio control apparatus corrects the target air-fuel ratio by a parameter on the condition of the engine detected by the detecting means so that a fuel supplying device is controlled to obtain a corrected target air-fuel ratio.
Inventors
- 👤 Masanobu Uchinami
- 👤 Toshihisa Takahashi
- 👤 Ryoji Nishiyama
- 👤 Hiroyoshi Suzuki
- 👤 Shinichi Nishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:56
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1477; F02D41/1479
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
170 words
An air-fuel ratio control apparatus for controlling a fuel supply means in a fuel-injected internal combustion engine comprising: an exhaust gas sensor for detecting the actual air-fuel ratio and for outputting a signal indicative of said actual air-fuel ratio; means for detecting the actual load on said engine; means for detecting the RPM of said engine; a memory storing data of basic target air-fuel ratio in which the load and the RPM are used as parameters; means for reading the basic target air-fuel ratio from the memory to obtain a corrected target air-fuel ratio by calculation, means for producing a feedback control signal based upon the difference between the target air-fuel ratio and the actual air-fuel ratio based upon said signal produced from said exhaust gas sensor, and means for producing a signal for adjusting said injection system so as to alter the air-fuel ratio in a series of gradual step like changes depending on the lapse of time and the difference between said detected ratio and said optimum ratio.
Claim 2
Dependent Claim
170 words
An air-fuel ratio control apparatus for controlling a fuel supply means in a fuel-injected internal combustion engine comprising: an exhaust gas sensor for detecting the actual air-fuel ratio and for outputting a signal indicative of said actual air-fuel ratio; means for detecting the actual load on said engine; means for detecting the RPM of said engine; a memory storing data of basic target air-fuel ratio in which the load and the RPM are used as parameters; means for reading the basic target air-fuel ratio from the memory to obtain a corrected target air-fuel ratio by calculation, means for producing a feedback control signal based upon the difference between the target air-fuel ratio and the actual air-fuel ratio based upon said signal produced from said exhaust gas sensor, and means for producing a signal for adjusting said injection system so as to alter the air-fuel ratio in a series of gradual step like changes depending on the lapse of time and the difference between said detected ratio and said optimum ratio.
Claim 3
Dependent Claim
23 words
An apparatus as in claim 1, wherein said load on said engine is detected by the degree of the opening of a throttle.
Claim 4
Dependent Claim
21 words
An apparatus as in claim 1, wherein said load on said engine is detected by a measured intake-air quantity per RPM.
Claim 5
Dependent Claim
22 words
An apparatus as in claim 1, wherein said load on said engine is detected by the pressure in said intake air manifold.
Claim 6
Dependent Claim
22 words
An apparatus as in claim 4 wherein said means for determining means further comprises: means to factor a condition of said engine.
Claim 7
Dependent Claim
17 words
An apparatus as in claim 5 wherein said means to factor comprises: a water temperature detection means.
Claim 8
Dependent Claim
23 words
An apparatus as in claim 5 wherein said means to factor comprises: means for calculating, determining how long said engine has been running.
Claim 9
Dependent Claim
24 words
An apparatus as in claim 5 wherein said means to factor comprises: means for determining the time period after a fuel cut has returned.
Claim 10
Dependent Claim
25 words
An apparatus as in claim 5 wherein said means to factor comprises: means for determining the number of revolutions after a fuel cut has returned.
Claim 11
Dependent Claim
26 words
An apparatus as in claim 5 wherein said means to factor comprises: means for determining the time period since a change in acceleration of said engine.
Claim 12
Dependent Claim
29 words
An apparatus as in claim 5 wherein said means to factor comprises: means for determining the number of revolutions in an idle or near idle condition of said engine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |