US4949693A
Expired / Lapsed
US
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Fuel injection control device of an engine
Assignee: Toyota Motor Corp
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Filing: 1988-11-07
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Granted: 1990-08-21
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Expires: 2008-11-07
Abstract
Abstract A fuel injection control device comprising an electronic control unit in which a changing rate of the amount of air fed into the engine cylinders per one revolution of the engine is calculated. The amount of fuel injected by the fuel injector is increased and decreased when the changing rate becomes positive and negative, respectively. The decrease in the amount of fuel injected by the fuel injector is prohibited even when the changing rate becomes negative until a predetermined time has elapsed after the engine is started.
Inventors
- 👤 Yukihiro Sonoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:11
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/045; F02D41/047; F02D41/06; F02D41/061; F02D41/10; F02D41/107
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
260 words
A fuel injection control device of an engine having an engine cylinder and a fuel injector, said device comprising: engine speed detecting means for detecting an engine speed; air amount detecting means for detecting an amount of air fed into the engine cylinder; air amount calculating means for calculating said amount of air per one revolution of the engine on the basis of a result of a detection by said engine speed detecting means and said air amount detecting means; fuel amount calculating means for calculating an amount of fuel injected by the fuel injector on the basis of a result of a calculation by said air amount calculating means; changing rate calculating means for calculating a changing rate of said amount of air per one revolution of the engine on the basis of the result of the calculation by said air amount calculating means; correction means for correcting said amount of fuel injected by the fuel injector in response to a change of said changing rate to increase said amount of fuel when said changing rate is positive and to decrease said amount of fuel when said changing rate is negative; enrichment means for increasing said amount of fuel during a predetermined enrichment period after the engine is started; and prohibition means for prohibiting a decreasing operation of said amount of fuel, which operation is effected by said correction means, even when said changing rate is negative during a predetermined prohibition period after the engine is started, wherein said predetermined prohibition period is equal to said predetermined enrichment period.
Claim 2
Dependent Claim
260 words
A fuel injection control device of an engine having an engine cylinder and a fuel injector, said device comprising: engine speed detecting means for detecting an engine speed; air amount detecting means for detecting an amount of air fed into the engine cylinder; air amount calculating means for calculating said amount of air per one revolution of the engine on the basis of a result of a detection by said engine speed detecting means and said air amount detecting means; fuel amount calculating means for calculating an amount of fuel injected by the fuel injector on the basis of a result of a calculation by said air amount calculating means; changing rate calculating means for calculating a changing rate of said amount of air per one revolution of the engine on the basis of the result of the calculation by said air amount calculating means; correction means for correcting said amount of fuel injected by the fuel injector in response to a change of said changing rate to increase said amount of fuel when said changing rate is positive and to decrease said amount of fuel when said changing rate is negative; enrichment means for increasing said amount of fuel during a predetermined enrichment period after the engine is started; and prohibition means for prohibiting a decreasing operation of said amount of fuel, which operation is effected by said correction means, even when said changing rate is negative during a predetermined prohibition period after the engine is started, wherein said predetermined prohibition period is equal to said predetermined enrichment period.
Claim 3
Dependent Claim
54 words
A fuel injection control device according to claim 1, wherein said enrichment means controls an enrichment correction coefficient which corrects said amount of fuel, said amount of fuel being increased as said enrichment correction coefficient is increased, said enrichment correction coefficient being reduced from a predetermined value to zero during said predetermined enrichment period.
Claim 4
Dependent Claim
22 words
A fuel injection control device according to claim 2 , wherein said predetermined value becomes large as an engine temperature becomes low.
Claim 5
Dependent Claim
49 words
A fuel injection control device according to claim 1, wherein a correction of said amount of fuel, which is effected by said correction means, is not carried out when an absolute value of said amount of air per one revolution of the engine is smaller than a predetermined value.
Claim 6
Dependent Claim
64 words
A fuel injection control device according to claim 1, wherein said correction means controls a transition state correction coefficient which corrects said amount of fuel, said amount of fuel being increased and decreased as said transition state correction coefficient is increased and decreased, respectively, said transition state correction coefficient being obtained by multiplying said changing rate by a predetermined basic transition state correction coefficient.
Claim 7
Dependent Claim
24 words
A fuel injection control device according to claim 5, wherein said basic transition state correction coefficient becomes large as an engine temperature becomes low.
Claim 8
Dependent Claim
29 words
A fuel injection control device according to claim 1, wherein it is determined that the engine start up is completed when the engine is rotating under its own power.
Claim 9
Dependent Claim
30 words
A fuel injection control device according to claim 7, wherein it is determined that the engine is rotating under its own power when the engine speed exceeds about 400 r.p.m.
Claim 10
Dependent Claim
251 words
A fuel injection control device of an engine having an engine cylinder and a fuel injector, said device comprising: engine speed detecting means for detecting an engine speed; air amount detecting means for detecting an amount of air fed into the engine cylinder; air amount calculating means for calculating said amount of air per one revolution of the engine on the basis of a result of a detection by said engine speed detecting means and said air amount detecting means; fuel amount calculating means for calculating an amount of fuel injected by the fuel injector on the basis of a result of a calculation by said air amount calculating means; changing rate calculating means for calculating a changing rate of said amount of air per one revolution of the engine on the basis of the result of the calculation by said air amount calculating means; correction means for correcting said amount of fuel injected by the fuel injector in response to a change of said changing rate to increase said amount of fuel when said changing rate is positive and to decrease said amount of fuel when said changing rate is negative; and prohibition means for prohibiting a decreasing operation of said amount of fuel, which operation is effected by said correction means, even when said changing rate is negative during a predetermined prohibition period after the engine is started, wherein said predetermined prohibition period is a period until the engine speed exceeds a predetermined speed after the engine is started.
Claim 11
Dependent Claim
251 words
A fuel injection control device of an engine having an engine cylinder and a fuel injector, said device comprising: engine speed detecting means for detecting an engine speed; air amount detecting means for detecting an amount of air fed into the engine cylinder; air amount calculating means for calculating said amount of air per one revolution of the engine on the basis of a result of a detection by said engine speed detecting means and said air amount detecting means; fuel amount calculating means for calculating an amount of fuel injected by the fuel injector on the basis of a result of a calculation by said air amount calculating means; changing rate calculating means for calculating a changing rate of said amount of air per one revolution of the engine on the basis of the result of the calculation by said air amount calculating means; correction means for correcting said amount of fuel injected by the fuel injector in response to a change of said changing rate to increase said amount of fuel when said changing rate is positive and to decrease said amount of fuel when said changing rate is negative; and prohibition means for prohibiting a decreasing operation of said amount of fuel, which operation is effected by said correction means, even when said changing rate is negative during a predetermined prohibition period after the engine is started, wherein said predetermined prohibition period is a period until the engine speed exceeds a predetermined speed after the engine is started.
Claim 12
Dependent Claim
17 words
A fuel injection control device according to claim 9, wherein said predetermined speed is about 1000 r.p.m.
Claim 13
Dependent Claim
49 words
A fuel injection control device according to claim 9, wherein a correction of said amount of fuel, which is effected by said correction means, is not carried out when an absolute value of said amount of air per one revolution of the engine is smaller than a predetermined value.
Claim 14
Dependent Claim
64 words
A fuel injection control device according to claim 9, wherein said correction means controls a transition state correction coefficient which corrects said amount of fuel, said amount of fuel being increased and decreased as said transition state correction coefficient is increased and decreased, respectively, said transition state correction coefficient being obtained by multiplying said changing rate by a predetermined basic transition state correction coefficient.
Claim 15
Dependent Claim
24 words
A fuel injection control device according to claim 9, wherein said basic transition state correction coefficient becomes large as an engine temperature becomes low.
Claim 16
Dependent Claim
29 words
A fuel injection control device according to claim 9, wherein it is determined that the engine start up is completed when the engine is rotating under its own power.
Claim 17
Dependent Claim
30 words
A fuel injection control device according to claim 14, wherein it is determined that the engine is rotating under its own power when the engine speed exceeds about 400 r.p.m.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |