Patent US4976242A successfully refreshed from Google Patents.
US4976242A
Expired / Lapsed
US
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Fuel injection control device of an engine
Assignee: Toyota Motor Corp
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Filing: 1990-01-24
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Granted: 1990-12-11
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Expires: 2010-01-24
Abstract
Abstract A fuel injection control device in which it is determined whether the air-fuel mixture is lean or rich at a predetermined crankangle during a lean-rich discriminating time at the time of acceleration. The lean-rich discriminating time is shortened as the degree of the acceleration becomes larger, and the times of being lean and the times of being rich within the lean-rich discriminating time are calculated. When the times of being lean are larger than the times of being rich, and the difference therebetween is larger than a predetermined value, the accelerating increasing rate of the amount of fuel fed into the engine cylinder is increased.
Inventors
- 👤 Yukihiro Sonoda
- 👤 Kouichi Osawa
- 👤 Hiroshi Kanai
- 👤 Kouichi Hoshi
- 👤 Hiroki Matsuoka
- 👤 Michihiro Ohashi
- 👤 Hiroshi Sawada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:53
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/045; F02D41/14; F02D41/1438; F02D41/1473; F02D41/1474; F02D41/1477; F02D41/1481
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
317 words
A fuel injection control device of an engine having an intake passage and an exhaust passage, said device comprising: an oxygen concentration detector arranged in the exhaust passage and producing an output signal indicating whether an air-fuel mixture fed into the engine is lean or rich; feedback control means for controlling an amount of fuel fed into the engine in response to the output signal of said oxygen concentration detector to bring an air-fuel ratio of the mixture to a desired air-fuel ratio; means for detecting an accelerating operation of the engine; fuel increasing means for increasing the amount of fuel fed into the engine when the accelerating operation of the engine is carried out; times calculation means determining, on the basis of the output signal of said oxygen concentration detector, whether the air-fuel mixture is lean or rich at a predetermined crankangle during a lean-rich discriminating time when the accelerating operation of the engine is carried out to calculate both times of being lean and times of being rich within said lean-rich discriminating time; time control means for controlling said lean-rich discriminating time in response to a degree of an acceleration of the engine to shorten said lean-rich discriminating time as said degree of the acceleration of the engine becomes larger; means for calculating a difference between said times of being lean and said times of being rich; and correction means for correcting an increase in the amount of fuel, which increase is caused by said fuel increasing means, to increase said increase in the amount of fuel when said times of being lean is larger than said times of being rich and when said difference is larger than a predetermined value, and to reduce said increase in the amount of fuel when said times of being rich is larger than said times of being lean and when said difference is larger than a predetermined value.
Claim 2
Dependent Claim
317 words
A fuel injection control device of an engine having an intake passage and an exhaust passage, said device comprising: an oxygen concentration detector arranged in the exhaust passage and producing an output signal indicating whether an air-fuel mixture fed into the engine is lean or rich; feedback control means for controlling an amount of fuel fed into the engine in response to the output signal of said oxygen concentration detector to bring an air-fuel ratio of the mixture to a desired air-fuel ratio; means for detecting an accelerating operation of the engine; fuel increasing means for increasing the amount of fuel fed into the engine when the accelerating operation of the engine is carried out; times calculation means determining, on the basis of the output signal of said oxygen concentration detector, whether the air-fuel mixture is lean or rich at a predetermined crankangle during a lean-rich discriminating time when the accelerating operation of the engine is carried out to calculate both times of being lean and times of being rich within said lean-rich discriminating time; time control means for controlling said lean-rich discriminating time in response to a degree of an acceleration of the engine to shorten said lean-rich discriminating time as said degree of the acceleration of the engine becomes larger; means for calculating a difference between said times of being lean and said times of being rich; and correction means for correcting an increase in the amount of fuel, which increase is caused by said fuel increasing means, to increase said increase in the amount of fuel when said times of being lean is larger than said times of being rich and when said difference is larger than a predetermined value, and to reduce said increase in the amount of fuel when said times of being rich is larger than said times of being lean and when said difference is larger than a predetermined value.
Claim 3
Dependent Claim
50 words
A fuel injection control device according to claim 1, wherein said degree of the acceleration is determined by a rate of change in an engine load L, and said time control means shortens said lean-rich discriminating time as the rate of the change in the engine load L becomes higher.
Claim 4
Dependent Claim
25 words
A fuel injection control device according to claim 2, wherein said engine load L is represented by an absolute pressure PM in the intake passage.
Claim 5
Dependent Claim
35 words
A fuel injection control device according to claim 2, wherein said engine load L is represented by Q/N, where Q indicates an amount of air fed into the engine and N indicates an engine speed.
Claim 6
Dependent Claim
64 words
A fuel injection control device according to claim 2, wherein said rate of the change in the engine load L is determined by a load difference between the engine load L and a blunt value Mn of the engine load L, which is obtained by blunting the change in the engine load L, and said lean-rich discriminating time is determined by said load difference.
Claim 7
Dependent Claim
27 words
A fuel injection control device according to claim 5, wherein said lean-rich discriminating time is a time during which said load difference is within a predetermined range.
Claim 8
Dependent Claim
54 words
A fuel injection control according to claim 5, wherein said engine load L is detected at a predetermined crankangle, and said blunt value Mn is calculated at a predetermined crankangle on the basis of said engine load L and a blunt value Mo which has been calculated before said blunt value Mn is calculated.
Claim 9
Dependent Claim
24 words
A fuel injection control device according to claim 7, wherein said blunt value Mn is represented by (K.Mo+L)/(K+1), K is a positive integral number.
Claim 10
Dependent Claim
24 words
A fuel injection control device according to claim 7, wherein a calculation of said blunt value Mn is begun after the engine is started.
Claim 11
Dependent Claim
29 words
A fuel injection control device according to claim 1, wherein said times calculation means stops determining whether the air-fuel mixture is lean or rich in a predetermined operating state.
Claim 12
Dependent Claim
35 words
A fuel injection control device according to claim 10, wherein said predetermined operating state is a state wherein an engine speed exceeds a predetermined speed when the accelerating operation of the engine is carried out.
Claim 13
Dependent Claim
30 words
A fuel injection control device according to claim 10, wherein said predetermined operating state is a state wherein a feedback control by said feedback control means is not carried out.
Claim 14
Dependent Claim
67 words
A fuel injection control device according to claim 1, wherein said increase in the amount of fuel by said fuel increasing means is increased for a short time after the accelerating operation of the engine is started, and a reduction in said increase in the amount of fuel is begun after said short time has elapsed and continues after the accelerating operation of the engine is completed.
Claim 15
Dependent Claim
67 words
A fuel injection control device according to claim 13, wherein said increase in the amount of fuel is controlled on the basis of a rate of change in an engine load L, and said increase in the amount of fuel is increased when said rate of change is relatively high, said increase in the amount of fuel being reduced when said rate of change is relatively low.
Claim 16
Dependent Claim
25 words
A fuel injection control device according to claim 14, wherein said engine load L is represented by an absolute pressure PM in the intake passage.
Claim 17
Dependent Claim
35 words
A fuel injection control device according to claim 14, wherein said engine load L is represented by Q/N, where Q indicates an amount of air fed into the engine and N indicates an engine speed.
Claim 18
Dependent Claim
49 words
A fuel injection control device according to claim 14, wherein said rate of change in the engine load L is determined by a rate of change ΔL in a blunt value Mn of the engine load L, which is obtained by blunting the change in the engine load L.
Claim 19
Dependent Claim
54 words
A fuel injection control according to claim 17, wherein said engine load L is detected at a predetermined crankangle, and said blunt value Mn is calculated at a predetermined crankangle on the basis of said engine load L and a blunt value Mo which has been calculated before said blunt value Mn is calculated.
Claim 20
Dependent Claim
25 words
A fuel injection control device according to claim 18, wherein said blunt value Mn is represented by (K.Mo+L)/(K+1), where K is a positive integral number.
Claim 21
Dependent Claim
55 words
A fuel injection control device according to claim 17, wherein said increase in the amount of fuel is calculated from the following equation. TPAEW={C.sub.2.ΔL+C.sub.3.(ΔL+C.sub.1.ΣΔL)}.C.sub.4 where TPAEW: said increase in the amount of fuel ΔL: said rate of change in said blunt value C 1 , C 2 , C 3 , C 4 : coefficients.
Claim 22
Dependent Claim
16 words
A fuel injection control device according to claim 20, wherein said correction means corrects said TPAEW.
Claim 23
Dependent Claim
149 words
A fuel injection control device according to claim 20, further comprising: means for detecting a decelerating operation of the engine; fuel decreasing means for decreasing the amount of fuel fed into the engine when the decelerating operation of the engine is carried out; and correction means used during a deceleration operation for correcting an decrease in the amount of fuel, which decrease is caused by said fuel decreasing means, to increase said decrease in the amount of fuel when said times of being lean is larger than said times of being rich and when said difference is larger than a predetermined value, and to reduce said decrease in the amount of fuel when said times of being rich is larger than said times of being lean and when said difference is larger than a predetermined value, said decrease in the amount of fuel being also calculated from said TPAEW.
Claim 24
Dependent Claim
21 words
A fuel injection control device according to claim 22, wherein said correction means used during a deceleration operation corrects said TPAEW.
Claim 25
Dependent Claim
46 words
A fuel injection control device according to claim 20, wherein said increase in the amount of fuel is controlled by a rate of change ΔL in an engine load L, and is increased as said rate of change ΔL in the engine load L becomes higher.
Claim 26
Dependent Claim
35 words
A fuel injection control device according to claim 24, wherein said engine load L is represented by Q/N, where Q indicates an amount of air fed into the engine and N indicates an engine speed.
Claim 27
Dependent Claim
26 words
A fuel injection control device according to claim 24, wherein said increase in the amount of fuel is calculated by C.ΔL, where C is a coefficient.
Claim 28
Dependent Claim
16 words
A fuel injection control device according to claim 26, wherein said correction means corrects said C.ΔL.
Claim 29
Dependent Claim
149 words
A fuel injection control device according to claim 26, further comprising: means for detecting a decelerating operation of the engine; fuel decreasing means for decreasing the amount of fuel fed into the engine when the decelerating operation of the engine is carried out; and correction means used during a deceleration operation for correcting an decrease in the amount of fuel, which decrease is caused by said fuel decreasing means, to increase said decrease in the amount of fuel when said times of being lean is larger than said times of being rich and when said difference is larger than a predetermined value, and to reduce said decrease in the amount of fuel when said times of being rich is larger than said times of being lean and when said difference is larger than a predetermined value, said decrease in the amount of fuel being also calculated from said C.ΔL.
Claim 30
Dependent Claim
21 words
A fuel injection control device according to claim 28, wherein said correction means used during a deceleration operation corrects said C.ΔL.
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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) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |