US4550703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continous method of fuel injection in electronically controlled engine
Assignee: Toyota Motor Corp
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Filing: 1982-03-11
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Granted: 1985-11-05
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Expires: 2002-03-11
Abstract
Abstract The minimum fuel injection time is on electronically controlled fuel injection engine is set in relation to the running condition of the engine. For example, in shift change, when the throttle valve is in the idling angle and the revolution speed of the engine is high, the minimum fuel injection time is set to a small value to improve the efficiency of fuel consumption. Also, at the completion of fuel cut-off when the revolution speed of the engine is low, the minimum fuel injection time is set to a large value to improve the driveability of the vehicle.
Inventors
- 👤 Takayuki Ootuka
- 👤 Toshiyuki Murai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:40
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/12; F02D41/123; F02D41/126; F02D41/14; F02D41/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
112 words
A method for fuel injection in a vehicle with an electronically controlled engine having a calculated fuel injection amount and a minimum fuel injection amount, the minimum fuel injection amount, in the absence of fuel cut-off, being supplied to the engine when the calculated fuel injection amount is less than the minimum fuel injection amount, said method comprising the steps of: setting the minimum fuel injection amount to a first predetermined value; and setting the minimum fuel injection amount to a second predetermined value higher than said first predetermined value whenever driveability of the vehicle is adversely affected by the setting of the minimum fuel injection amount to said first predetermined value.
Claim 2
Independent Claim
112 words
A method for fuel injection in a vehicle with an electronically controlled engine having a calculated fuel injection amount and a minimum fuel injection amount, the minimum fuel injection amount, in the absence of fuel cut-off, being supplied to the engine when the calculated fuel injection amount is less than the minimum fuel injection amount, said method comprising the steps of: setting the minimum fuel injection amount to a first predetermined value; and setting the minimum fuel injection amount to a second predetermined value higher than said first predetermined value whenever driveability of the vehicle is adversely affected by the setting of the minimum fuel injection amount to said first predetermined value.
Claim 3
Dependent Claim
26 words
A method as recited in claim 1 wherein an adverse effect on the driveability of the vehicle is detected from the revolution speed of the engine.
Claim 4
Dependent Claim
61 words
A method as recited in claim 2, wherein the minimum fuel injection amount is set to said first predetermined value when the revolution speed of the engine is higher than a third predetermined value, and the minimum fuel injection amount is set to said second predetermined value when the revolution speed of the engine is lower than said third predetermined value.
Claim 5
Dependent Claim
40 words
A method as recited in claim 1 wherein an adverse effect on driveability of the vehicle is detected from the revolution speed of the engine and the opening angle of a throttle valve in the intake system of the engine.
Claim 6
Dependent Claim
82 words
A method as recited in claim 4 wherein the minimum fuel injection amount is set to said first predetermined value when the revolution speed of the engine is higher than a third predetermined value or when the throttle value is not at the idling angle; and wherein the minimum fuel injection amount is set to said second predetermined value when the revolution speed of the engine is lower than the third predetermined value and the throttle valve is at the idling angle.
Claim 7
Independent Claim
120 words
A method for fuel injection in a vehicle with an electronically controlled engine having a calculated fuel injection pulse width and a minimum fuel injection pulse width, the minimum fuel injection pulse width, in the absence of fuel cut-off, being supplied to the engine when the calculated fuel injection pulse width is less than the minimum fuel injection pulse width, said method comprising the steps of: setting the minimum fuel injection pulse width to a first predetermined value; and setting the minimum fuel injection pulse width to a second predetermined value higher than said first predetermined value whenever driveability of the vehicle is adversely affected by the setting of the minimum fuel injection pulse width to said first predetermined value.
Claim 8
Independent Claim
120 words
A method for fuel injection in a vehicle with an electronically controlled engine having a calculated fuel injection pulse width and a minimum fuel injection pulse width, the minimum fuel injection pulse width, in the absence of fuel cut-off, being supplied to the engine when the calculated fuel injection pulse width is less than the minimum fuel injection pulse width, said method comprising the steps of: setting the minimum fuel injection pulse width to a first predetermined value; and setting the minimum fuel injection pulse width to a second predetermined value higher than said first predetermined value whenever driveability of the vehicle is adversely affected by the setting of the minimum fuel injection pulse width to said first predetermined value.
Claim 9
Dependent Claim
26 words
A method as recited in claim 6 wherein an adverse effect on the driveability of the vehicle is detected from the revolution speed of the engine.
Claim 10
Dependent Claim
63 words
A method as recited in claim 7 wherein the minimum fuel injection pulse width is set to said first predetermined value when the revolution speed of the engine is higher than a third predetermined value, and the minimum fuel injection pulse width is set to said second predetermined value when the revolution speed of the engine is lower than said third predetermined value.
Claim 11
Dependent Claim
40 words
A method as recited in claim 6 wherein an adverse effect on driveability of the vehicle is detected from the revolution speed of the engine and the opening angle of a throttle valve in the intake system of the engine.
Claim 12
Dependent Claim
84 words
A method as recited in claim 9 wherein the minimum fuel injection pulse width is set to said first predetermined value when the revolution speed of the engine is higher than a third predetermined value or when the throttle valve is not at the idling angle; and wherein the minimum fuel injection pulse width is set to said second predetermined value when the revolution speed of the engine is lower than said third predetermined value and the throttle valve is at the idling angle.
References Cited (Backward Citations)
US3690305A
Cited
US4221191A
Cited
US4250853A
Cited
US4327682A
Cited
US4242991A
Cited
DE2847794A1
Cited
US4305365A
Cited
US4326488A
Cited
US4334513A
Cited
US4353342A
Cited
US4357924A
Cited
US4383514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |