US4957088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection control system for an automotive engine
Assignee: Subaru Corp
•
Filing: 1989-09-22
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Granted: 1990-09-18
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Expires: 2009-09-22
Abstract
Abstract The quantity of air induced in a cylinder of an engine is estimated by using equations based on various coefficients. The coefficients are stored in a memory and derived in accordance with engine operating conditions. The estimated quantity of induced air is corrected so as to approximate quantity of air actually induced in the cylinder. A basic injection pulse width is calculated based on the corrected air quantity. The basic injection pulse width is corrected by a feedback coefficient, thereby producing a fuel injection pulse width signal for operating a fuel injector of the engine.
Inventors
- 👤 Hiroshi Hosaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:37
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/24; F02D41/2406; F02D41/2409; F02D41/2422; F02D41/02; F02D41/04; F02D41/10; F02D41/107; F02D41/18; F02D41/182
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
208 words
A system for controlling fuel injection of an engine for a motor vehicle having an intake passage, a throttle valve provided in the intake passage, and a fuel injector, the system comprising: an engine speed sensor for producing an engine speed signal dependent on speed of the engine; a throttle position sensor for producing a throttle opening degree signal dependent on opening degree of the throttle valve; an intake air temperature sensor for producing an intake air temperature signal; storing means for storing various coefficients which are arranged in accordance with the engine speed signal, the throttle opening degree signal and the intake air temperature signal; first calculator means for calculating a quantity of induced air, using coefficients derived from the storing means in accordance with the engine speed signal, throttle opening degree signal and intake air temperature signal; correcting means for correcting the induced air quantity calculated by the first calculator means, using a coefficient derived from the storing means in accordance with the engine speed signal and for producing a corrected induced air quantity signal; and second calculator means for producing a basic injection pulse width signal in accordance with said corrected induced air quantity signal so as to approximate to an actual induced air quantity.
Claim 2
Independent Claim
208 words
A system for controlling fuel injection of an engine for a motor vehicle having an intake passage, a throttle valve provided in the intake passage, and a fuel injector, the system comprising: an engine speed sensor for producing an engine speed signal dependent on speed of the engine; a throttle position sensor for producing a throttle opening degree signal dependent on opening degree of the throttle valve; an intake air temperature sensor for producing an intake air temperature signal; storing means for storing various coefficients which are arranged in accordance with the engine speed signal, the throttle opening degree signal and the intake air temperature signal; first calculator means for calculating a quantity of induced air, using coefficients derived from the storing means in accordance with the engine speed signal, throttle opening degree signal and intake air temperature signal; correcting means for correcting the induced air quantity calculated by the first calculator means, using a coefficient derived from the storing means in accordance with the engine speed signal and for producing a corrected induced air quantity signal; and second calculator means for producing a basic injection pulse width signal in accordance with said corrected induced air quantity signal so as to approximate to an actual induced air quantity.
Claim 3
Dependent Claim
68 words
The system according to claim 1 further comprising third calculator means for calculating a quantity of throttle valve passing air, and fourth calculator means for calculating an intake passage pressure based on the calculated quantity of throttle valve passing air and a coefficient in accordance with the intake air temperature signal, the first calculator means calculates the induced air quantity further based on the calculated intake passage pressure.
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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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |