US4508086A
Expired / Lapsed
US
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Method of electronically controlling fuel injection for internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1984-05-04
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Granted: 1985-04-02
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Expires: 2004-05-04
Abstract
Abstract Fuel is injected in synchronism with the crank angle. In addition, an engine acceleration state is detected from the second-order differential value of the intake-pipe pressure, and the quantity of the asynchronous fuel injection in which fuel is injected in asynchronism with the crank angle is increased in an early stage of acceleration but is decreased after the early stage of acceleration. Moreover, no asynchronous injection is carried out in a low engine speed region. It is thereby possible to obtain an optimum air-fuel ratio in accordance with the engine acceleration state.
Inventors
- 👤 Toshimitsu Ito
- 👤 Kazuhiko Norota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:17
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/10; F02D41/105
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
148 words
A method of electronically controlling a fuel injection for an internal combustion engine wherein fuel is injected in asynchronism with a crank angle when a throttle valve is open and a rate of change of an engine load takes a positive value, comprising the steps of: obtaining a second-order differential value of the engine load with respect to time defined as the rate of change of a change rate of the engine load; injecting a first quantity of fuel during a period after a point of time when the throttle valve at fully closed position is opened until a predetermined period of time has elapsed and when said second-order differential value is not less than a first reference value; and injecting a second quantity of fuel after said predetermined period of time has elapsed and when said second-order differential value is not less than a second reference value.
Claim 2
Independent Claim
148 words
A method of electronically controlling a fuel injection for an internal combustion engine wherein fuel is injected in asynchronism with a crank angle when a throttle valve is open and a rate of change of an engine load takes a positive value, comprising the steps of: obtaining a second-order differential value of the engine load with respect to time defined as the rate of change of a change rate of the engine load; injecting a first quantity of fuel during a period after a point of time when the throttle valve at fully closed position is opened until a predetermined period of time has elapsed and when said second-order differential value is not less than a first reference value; and injecting a second quantity of fuel after said predetermined period of time has elapsed and when said second-order differential value is not less than a second reference value.
Claim 3
Dependent Claim
45 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 1, wherein said first and second reference values are increased in accordance with time from the point of time when the throttle valve at fully closed position is opened.
Claim 4
Dependent Claim
31 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 1, wherein said second quantity of fuel is increased as said second-order differential value increases.
Claim 5
Dependent Claim
31 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 2, wherein said second quantity of fuel is increased as said second-order differential value increases.
Claim 6
Independent Claim
164 words
A method of electronically controlling a fuel injection for an internal combustion engine wherein fuel is injected in asynchronism with a crank angle when a throttle valve is open and the rate of change of an engine load takes a positive value, comprising the steps of: obtaining a time based on a point of time when the throttle valve at fully closed position is opened, as well as determining a reference value which is increased in accordance with said time; obtaining a second-order differential value of the engine load with respect to time defined as the rate of change of a change rate of the engine load; injecting a first quantity of fuel when said time is not exceeding a predetermined period of time and said second-order differential value is not less than said reference value; and injecting a second quantity of fuel when said time exceeds said predetermined period of time and said second-order differential value is not less than said reference value.
Claim 7
Independent Claim
164 words
A method of electronically controlling a fuel injection for an internal combustion engine wherein fuel is injected in asynchronism with a crank angle when a throttle valve is open and the rate of change of an engine load takes a positive value, comprising the steps of: obtaining a time based on a point of time when the throttle valve at fully closed position is opened, as well as determining a reference value which is increased in accordance with said time; obtaining a second-order differential value of the engine load with respect to time defined as the rate of change of a change rate of the engine load; injecting a first quantity of fuel when said time is not exceeding a predetermined period of time and said second-order differential value is not less than said reference value; and injecting a second quantity of fuel when said time exceeds said predetermined period of time and said second-order differential value is not less than said reference value.
Claim 8
Dependent Claim
31 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 5, wherein said second quantity of fuel is increased as said second-order differential value increases.
Claim 9
Dependent Claim
41 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 5, wherein said reference value, which is increased in accordance with time, is further increased by a predetermined quantity in a low engine speed region.
Claim 10
Dependent Claim
41 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 6, wherein said reference value, which is increased in accordance with time, is further increased by a predetermined quantity in a low engine speed region.
Claim 11
Dependent Claim
40 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 5, wherein said reference value, which is increased in accordance with time, is further increased by a predetermined quantity after the injection of fuel.
Claim 12
Dependent Claim
31 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 9, wherein said second quantity of fuel is increased as said second-order differential value increases.
Claim 13
Dependent Claim
41 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 9, wherein said reference value, which is increased in accordance with time, is further increased by a predetermined quantity in a low engine speed region.
Claim 14
Dependent Claim
41 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 10, wherein said reference value, which is increased in accordance with time, is further increased by a predetermined quantity in a low engine speed region.
Claim 15
Independent Claim
192 words
A method of electronically controlling a fuel injection for an internal combustion engine wherein fuel is injected in asynchronism with a crank angle when a throttle valve is open and the rate of change of an engine load takes a positive value, comprising the steps of: obtaining a second-order differential value of the engine load with respect to time which is defined as the rate of change of a change rate of the engine load, and a third-order differential value of the engine load with respect to time which is defined as the rate of change of said second-order differential value; injecting a first quantity of fuel during a period from a point of time when the throttle valve at fully closed position is opened until a predetermined period of time has elapsed and when said second-order differential value is not less than a first reference value and said third-order differential value is not negative; and injecting a second quantity of fuel after said predetermined period of time has elapsed and when said second-order differential value is not less than a second reference value and said third-order differential value is not negative.
Claim 16
Independent Claim
192 words
A method of electronically controlling a fuel injection for an internal combustion engine wherein fuel is injected in asynchronism with a crank angle when a throttle valve is open and the rate of change of an engine load takes a positive value, comprising the steps of: obtaining a second-order differential value of the engine load with respect to time which is defined as the rate of change of a change rate of the engine load, and a third-order differential value of the engine load with respect to time which is defined as the rate of change of said second-order differential value; injecting a first quantity of fuel during a period from a point of time when the throttle valve at fully closed position is opened until a predetermined period of time has elapsed and when said second-order differential value is not less than a first reference value and said third-order differential value is not negative; and injecting a second quantity of fuel after said predetermined period of time has elapsed and when said second-order differential value is not less than a second reference value and said third-order differential value is not negative.
Claim 17
Dependent Claim
45 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 13, wherein said first and second reference values are increased in accordance with time from the point of time when the throttle valve at fully closed position is opened.
Claim 18
Dependent Claim
53 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 13, wherein said first and second reference values are obtained from a reference value which is increased in accordance with time based on the point of time when the throttle valve at fully closed position is opened.
Claim 19
Dependent Claim
31 words
A method of electronically controlling a fuel injection for an internal combustion engine according to claim 13, wherein said second quantity of fuel is increased as said second-order differential value increases.
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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) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |