US4395984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic fuel supply control system for internal combustion engines
Assignee: Nissan Motor Co Ltd
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Filing: 1980-09-25
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Granted: 1983-08-02
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Expires: 2000-09-25
Abstract
Abstract An electronic fuel supply control system for internal combustion engines which carries out the engine fuel cutoff while the engine is decelerated either with a predetermined delay or immediately depending on engine driving conditions, and preferably on the state of the transmission, thus reducing the jolt produced when the fuel cutoff is carried out.
Inventors
- 👤 Hiroshi Yamaguchi
- 👤 Kenji Ikeura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:52
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/24; F02D41/26; F02D41/02; F02D41/04; F02D41/12; F02D41/123
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
A fuel supply control system, for an internal combustion engine having an associated transmission, which cuts off the fuel supplied to said engine during deceleration conditions, comprising: (a) first means for determining when an engine fuel cutoff condition is satisfied; (b) second means, operative in response to a fuel supply cutoff determination from said first means, for setting a delay in effecting the actual fuel cutoff depending upon instantaneous engine operation; and (c) third means for cutting off the fuel supplied to the engine, either immediately in response to a fuel cutoff determination from said first means or after a delay set by said second means, depending upon instantaneous transmission operation.
Claim 2
Dependent Claim
111 words
A fuel supply control system, for an internal combustion engine having an associated transmission, which cuts off the fuel supplied to said engine during deceleration conditions, comprising: (a) first means for determining when an engine fuel cutoff condition is satisfied; (b) second means, operative in response to a fuel supply cutoff determination from said first means, for setting a delay in effecting the actual fuel cutoff depending upon instantaneous engine operation; and (c) third means for cutting off the fuel supplied to the engine, either immediately in response to a fuel cutoff determination from said first means or after a delay set by said second means, depending upon instantaneous transmission operation.
Claim 3
Dependent Claim
37 words
The fuel supply control system of claim 1, further comprising (d) fourth means for detecting fuel cutoff conditions, in which said second means is activated selectively according to at least one of the sensed fuel cutoff conditions.
Claim 4
Dependent Claim
25 words
The fuel supply control system of claim 2, in which said fourth means includes a means for the detection of the state of a transmission.
Claim 5
Dependent Claim
29 words
The fuel supply control system of claim 3, in which said second means is activated when said fourth means detects that the transmission is in a lower speed range.
Claim 6
Dependent Claim
30 words
The fuel supply control system of claim 4, in which said second means is activated when said fourth means detects that the transmission is not in the top speed range.
Claim 7
Dependent Claim
25 words
The fuel supply control system of claims 2 or 3 or 4 or 5, in which the delay is a predetermined accumulated interval of time.
Claim 8
Dependent Claim
25 words
The fuel supply control system of claims 2 or 3 or 4 or 5, in which the delay is a predetermined number of engine revolutions.
Claim 9
Dependent Claim
66 words
The fuel supply control system of claim 2, in which said second means is activated when said fourth means detects that a throttle valve of the engine is fully closed and the instantaneous engine speed exceeds a first predetermined value, said first predetermined value being based on the engine cooling water temperature and being higher than a predetermined value which establishes resumption of the fuel supply.
Claim 10
Dependent Claim
39 words
The fuel supply control system of claim 2, in which said second means is not activated when said fourth means detects that the instantaneous engine speed decreases from below a first predetermined value with the throttle valve fully closed.
Claim 11
Dependent Claim
45 words
The fuel supply control system of claim 2, in which said second means is activated when said fourth means detects that the instantaneous engine speed increases from below a first predetermined value and becomes above a second predetermined value, with the throttle valve fully closed.
Claim 12
Dependent Claim
38 words
The fuel supply control system of claim 2, in which said second means is activated when said fourth means detects that the instantaneous engine speed increases from above a first predetermined value, with the throttle valve fully closed.
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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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |