US4583174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronically controlled fuel injection apparatus for internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1983-08-04
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Granted: 1986-04-15
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Expires: 2003-08-04
Abstract
Abstract An electronically controlled fuel injection apparatus for internal combustion engine which increases the rate of fuel injection when the engine speed drops by a rate more than a predetermined rate under a condition that the aperture of the throttle valve is minimum, that is, under an idling condition. In order to increase the rate of fuel injection, the width of the basic fuel injection pulse is enlarged which is given according to the engine speed and the intake air flow rate, or, in addition to the basic fuel injection pulse, a predetermined rate of fuel is injected asynchronously, i.e., independently from the crank angle of the engine.
Inventors
- 👤 Haruo Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:52
CPC Classifications
F; F02; F02D; F02D31/00; F02D31/001; F02D31/007; F02D41/00; F02D41/02; F02D41/04; F02D41/10; F02D41/105; F02D41/14; F02D41/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
173 words
An electronically controlled fuel injection apparatus for an internal combustion engine which controls the amount of fuel supplied to said internal combustion engine by controlling an injector, comprising: engine speed detecting means for detecting a speed of said engine; intake air flow rate amount detecting means for detecting the intake air flow rate supplied to said engine; idling condition sensing means for sensing that a throttle valve is operated to be the minimum aperture; basic injection pulse generating means for determining a basic fuel injection time according to the engine speed and the intake air flow rate so as to generate a pulse for opening the injector while the pulse is generated, said pulse having a width corresponding to said basic fuel injection time; and correction means for enlarging the width of said pulse for opening the injector when the engine decelerates at a rate more than a predetermined rate under idling condition, said correction means enlarging the width of said pulse by a width in proportion to the engine speed deceleration rate.
Claim 2
Dependent Claim
173 words
An electronically controlled fuel injection apparatus for an internal combustion engine which controls the amount of fuel supplied to said internal combustion engine by controlling an injector, comprising: engine speed detecting means for detecting a speed of said engine; intake air flow rate amount detecting means for detecting the intake air flow rate supplied to said engine; idling condition sensing means for sensing that a throttle valve is operated to be the minimum aperture; basic injection pulse generating means for determining a basic fuel injection time according to the engine speed and the intake air flow rate so as to generate a pulse for opening the injector while the pulse is generated, said pulse having a width corresponding to said basic fuel injection time; and correction means for enlarging the width of said pulse for opening the injector when the engine decelerates at a rate more than a predetermined rate under idling condition, said correction means enlarging the width of said pulse by a width in proportion to the engine speed deceleration rate.
Claim 3
Dependent Claim
82 words
An electronically controlled fuel injection apparatus for an internal combustion engine according to claim 1, said correction means comprising: rotation speed variation rate detecting means for detecting the speed acceleration rate of the engine; and rotation speed acceleration correction means for generating a correction signal when the engine speed acceleration rate is negative and greater in its absolute value than a predetermined value, said correction signal representing a value in proportion to the diference between the absolute value and the predetermined rate.
Claim 4
Dependent Claim
31 words
An electronically controlled fuel injection apparatus for an internal combustion engine according to claim 2, wherein the detection of the acceleration rate of the engine rotation speed made in one cycle.
Claim 5
Dependent Claim
168 words
An electronically controlled fuel injection apparatus for an internal combustion engine which controls the amount of fuel supplied to said internal combustion engine by controlling an injector, comprising: engine rotation speed detecting means for detecting a rotation speed of said engine; intake air flow rate detecting means for detecting the intake air flow rate supplied to said engine; idling condition sensing means for sensing that a throttle valve is operated to be the minimum aperture; basic injection pulse generating means for determining a basic fuel injection time according to the engine speed and the intake air flow rate so as to generate a pulse for opening the injector while the pusle is generated, said pulse having a width corresponding to said basic fuel injection time; and correction means for generating a pulse with a predetermined width for opening the injector independently from the pulse generated by said basic injection pulse generating means when the engine speed decelerates at a rate more than a predetermined rate under idling condition.
Claim 6
Dependent Claim
168 words
An electronically controlled fuel injection apparatus for an internal combustion engine which controls the amount of fuel supplied to said internal combustion engine by controlling an injector, comprising: engine rotation speed detecting means for detecting a rotation speed of said engine; intake air flow rate detecting means for detecting the intake air flow rate supplied to said engine; idling condition sensing means for sensing that a throttle valve is operated to be the minimum aperture; basic injection pulse generating means for determining a basic fuel injection time according to the engine speed and the intake air flow rate so as to generate a pulse for opening the injector while the pusle is generated, said pulse having a width corresponding to said basic fuel injection time; and correction means for generating a pulse with a predetermined width for opening the injector independently from the pulse generated by said basic injection pulse generating means when the engine speed decelerates at a rate more than a predetermined rate under idling condition.
Claim 7
Dependent Claim
62 words
An electronically controlled fuel injection apparatus for an internal combustion engine according to claim 4, said correction means comprising: rotation speed variation rate detecting means for detecting the speed acceleration rate of the engine; and rotation speed acceleration correction means for generating said pulse with a predetermined width when the engine speed rotation rate is negative and greater than a predetermined value.
Claim 8
Dependent Claim
31 words
An electronically controlled fuel injection apparatus for an internal combustion engine according to claim 5, wherein the detection of the acceleration rate of the engine rotation speed made in one cycle.
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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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |