US5090386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection control system for an internal combustion engine
Assignee: Subaru Corp
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Filing: 1990-10-25
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Granted: 1992-02-25
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Expires: 2010-10-25
Abstract
Abstract An ignition device intermittently produces an ignition voltage in synchronism with speed of an engine. A fuel injection control is provided for operating a fuel injector for injecting fuel. A fuel pump for supplying fuel to the fuel injector is stopped at a time after the ignition and fuel injection stop, thereby keeping fuel pressure in a fuel supply passage.
Inventors
- 👤 Shinichi Kurosu
- 👤 Mitsugi Chonan
- 👤 Fusao Tachibana
- 👤 Hideyuki Ishikawa
- 👤 Yoshiki Yuzuriha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:31
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/042; F02D41/30; F02D41/3082; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02D2400/00; F02D2400/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
207 words
A fuel injection control system for an internal combustion engine having a fuel pump, an ignition coil, a fuel injector receiving fuel from the fuel pump through a fuel passage, and an electronic control unit for controlling operation of the engine comprising: an ignition device for intermittently producing an ignition voltage in synchronism with speed and crank position of said engine for exciting said ignition coil; fuel injection means for operating said fuel injector for injecting fuel in accordance with engine operating conditions; first stopping means for stopping said fuel injection means from injecting fuel in accordance with engine operation conditions when the engine stops to at least a first predetermined minimum value; second stopping means for stopping the fuel pump after the stopping of the fuel injection means from injecting fuel in accordance with engine operating conditions when the engine stops to at least a second predetermined minimum value, said second predetermined minimum value being smaller than said first predetermined minimum value, said electronic control unit operating said fuel pump after the stopping of the fuel injection means from injecting fuel until said second stopping means stops the fuel pump so as to maintain pressure in the fuel passage to enable easy restarting of the engine.
Claim 2
Dependent Claim
207 words
A fuel injection control system for an internal combustion engine having a fuel pump, an ignition coil, a fuel injector receiving fuel from the fuel pump through a fuel passage, and an electronic control unit for controlling operation of the engine comprising: an ignition device for intermittently producing an ignition voltage in synchronism with speed and crank position of said engine for exciting said ignition coil; fuel injection means for operating said fuel injector for injecting fuel in accordance with engine operating conditions; first stopping means for stopping said fuel injection means from injecting fuel in accordance with engine operation conditions when the engine stops to at least a first predetermined minimum value; second stopping means for stopping the fuel pump after the stopping of the fuel injection means from injecting fuel in accordance with engine operating conditions when the engine stops to at least a second predetermined minimum value, said second predetermined minimum value being smaller than said first predetermined minimum value, said electronic control unit operating said fuel pump after the stopping of the fuel injection means from injecting fuel until said second stopping means stops the fuel pump so as to maintain pressure in the fuel passage to enable easy restarting of the engine.
Claim 3
Dependent Claim
34 words
The system according to claim 1 further comprising means for supplying power to said electronic control unit for a predetermined period after the stopping of the engine for storing data for restarting the engine.
Claim 4
Dependent Claim
75 words
The system according to claim 1, wherein said first stopping means includes first determining means for determining when the engine stops to at least the first predetermined minimum value by comparing the interval of ignitions with a first reference value; and said second stopping means includes second determining means for determining when the engine stops to at least the second predetermined minimum value by comparing the interval of the ignitions with a second reference value.
Claim 5
Dependent Claim
25 words
The system according to claim 1, wherein said first stopping means stops fuel injection when speed of the engine becomes lower than a predetermined speed.
Claim 6
Dependent Claim
22 words
The system according to claim 1, wherein said fuel injection means is responsive to said ignition voltage for controlling fuel injection timing.
Claim 7
Independent Claim
156 words
A method for controlling a system for an internal combustion engine having a fuel pump, an ignition coil, a fuel injector receiving fuel from the fuel pump through a fuel passage, and an electronic control unit for controlling operation of the engine, comprising the steps of: intermittently producing an ignition voltage in synchronism with speed and crank position of said engine for exciting the ignition coil; operating the fuel injector for injecting fuel in accordance with engine operating conditions; stopping the fuel injecting in accordance with engine operating conditions when the engine has stopped to at least a first predetermined minimum value; and thereafter stopping the fuel pump in accordance with engine operating conditions when the engine has stopped at least to a second predetermined minimum value, said second predetermined minimum value being smaller than said first predetermined minimum value, so as to maintain pressure in the fuel passage to enable easy restarting of the engine.
Claim 8
Independent Claim
156 words
A method for controlling a system for an internal combustion engine having a fuel pump, an ignition coil, a fuel injector receiving fuel from the fuel pump through a fuel passage, and an electronic control unit for controlling operation of the engine, comprising the steps of: intermittently producing an ignition voltage in synchronism with speed and crank position of said engine for exciting the ignition coil; operating the fuel injector for injecting fuel in accordance with engine operating conditions; stopping the fuel injecting in accordance with engine operating conditions when the engine has stopped to at least a first predetermined minimum value; and thereafter stopping the fuel pump in accordance with engine operating conditions when the engine has stopped at least to a second predetermined minimum value, said second predetermined minimum value being smaller than said first predetermined minimum value, so as to maintain pressure in the fuel passage to enable easy restarting of the engine.
Claim 9
Dependent Claim
182 words
A fuel injection control system for an internal combustion engine having a fuel pump, an ignition coil, a fuel injector receiving fuel from the fuel pump through a fuel passage, and an electronic control unit for controlling operation of the engine comprising: an ignition device for intermittently producing an ignition voltage in synchronism with speed and crank position of said engine for exciting said ignition coil; fuel injection means for operation said fuel injector for injecting fuel in accordance with engine operating conditions; first stopping means for stopping said fuel injection means from injecting fuel in accordance with engine operating conditions when the engine stops to at least a predetermined minimum value; and second stopping means for stopping the fuel pump after the stopping of the fuel injection means from injecting fuel in accordance with engine operating conditions, said electronic control unit operating said fuel pump after the stopping of the fuel injection means from injecting fuel until said second stopping means stops the fuel pump so as to maintain pressure in the fuel passage to enable easy restarting of the engine.
Claim 10
Dependent Claim
182 words
A fuel injection control system for an internal combustion engine having a fuel pump, an ignition coil, a fuel injector receiving fuel from the fuel pump through a fuel passage, and an electronic control unit for controlling operation of the engine comprising: an ignition device for intermittently producing an ignition voltage in synchronism with speed and crank position of said engine for exciting said ignition coil; fuel injection means for operation said fuel injector for injecting fuel in accordance with engine operating conditions; first stopping means for stopping said fuel injection means from injecting fuel in accordance with engine operating conditions when the engine stops to at least a predetermined minimum value; and second stopping means for stopping the fuel pump after the stopping of the fuel injection means from injecting fuel in accordance with engine operating conditions, said electronic control unit operating said fuel pump after the stopping of the fuel injection means from injecting fuel until said second stopping means stops the fuel pump so as to maintain pressure in the fuel passage to enable easy restarting of the engine.
Claim 11
Dependent Claim
84 words
The system according to claim 1, wherein said second stopping means includes determining means for determining when the engine stops to at least the second predetermined minimum value by comparing the interval of the ignitions with a reference value and determining if the interval is equal to or greater than the reference value, and said second stopping means producing a signal for stopping the fuel pump when said second stopping means determines that the interval is equal to or greater than the reference value.
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) | 1995-02-24 | 1995-08-26 | 1996-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-24 | 1999-08-26 | 2000-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-24 | 2003-08-26 | 2004-02-25 | $7700.00 | Window Closed / Lapsed |