US4899713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection control system for an automotive engine
Assignee: Subaru Corp
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Filing: 1989-02-09
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Granted: 1990-02-13
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Expires: 2009-02-09
Abstract
Abstract Average pressure of pressure in an intake passage is calculated. A basic injection quantity is determined by engine speed and the average pressure. On the other hand, estimated pressure is estimated from engine speed and throttle position. A correcting coefficient is obtained from the average pressure and the estimated pressure, and the basic injection quantity is corrected with the correcting coefficient.
Inventors
- 👤 Mitsuo Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:15
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/24; F02D41/26; F02D41/28; F02D41/30; F02D41/32; F02D41/34; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
196 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 for injecting fuel by a quantity determined by the system, the system comprising: an engine speed sensor producing an engine speed signal dependent on speed of the engine; a throttle position sensor producing a throttle position signal dependent on opening degree of the throttle valve; a pressure sensor producing a pressure signal dependent on pressure in the intake passage; first calculator means for averaging pressures represented by the pressure signal and for producing an average pressure signal; estimating means responsive to the engine speed signal and the throttle position signal for estimating pressure in the intake passage and for producing an estimated pressure signal; means responsive to the average pressure signal and the estimated pressure signal for producing a correcting signal; second calculator means responsive to the engine speed signal and the average pressure signal for producing a basic fuel injection quantity signal; and corrector means for correcting the basic fuel injection quantity signal with the correcting signal, for determining the quantity of fuel to be injected.
Claim 2
Independent Claim
196 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 for injecting fuel by a quantity determined by the system, the system comprising: an engine speed sensor producing an engine speed signal dependent on speed of the engine; a throttle position sensor producing a throttle position signal dependent on opening degree of the throttle valve; a pressure sensor producing a pressure signal dependent on pressure in the intake passage; first calculator means for averaging pressures represented by the pressure signal and for producing an average pressure signal; estimating means responsive to the engine speed signal and the throttle position signal for estimating pressure in the intake passage and for producing an estimated pressure signal; means responsive to the average pressure signal and the estimated pressure signal for producing a correcting signal; second calculator means responsive to the engine speed signal and the average pressure signal for producing a basic fuel injection quantity signal; and corrector means for correcting the basic fuel injection quantity signal with the correcting signal, for determining the quantity of fuel to be injected.
Claim 3
Dependent Claim
16 words
The system according to claim 1 wherein the engine speed sensor is a crank angle sensor.
Claim 4
Dependent Claim
13 words
The system according to claim 1 wherein the correcting signal is a coefficient.
References Cited (Backward Citations)
US4747387A
Cited
JPS603448A
Cited
US4705001A
Cited
US4831537A
Cited
US4782806A
Cited
US4836164A
Cited
US4836169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |