US4716876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection control system for internal combustion engine
Assignee: Mitsubishi Electric Corp
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Filing: 1986-10-22
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Granted: 1988-01-05
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Expires: 2006-10-22
Abstract
Abstract A fuel injection control system in which the output of a hot-wire air flow sensor is limited to a maximum value in order to compensate for return blow at low-speed, high-power conditions. However, the maximum value is adjusted for altitude and temperature.
Inventors
- 👤 Setsuhiro Shimomura
- 👤 Yukinobu Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:44
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; G; G01; G01F; G01F15/00; G01F15/02; G01F15/04; G01F15/043; G01F15/046; F02D41/04; F02D41/187; G01F1/00; G01F1/68
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
226 words
A fuel injection control system comprising: (a) an air-flow sensor (3) for detecting a quantity of suction air supplied to an internal combustion engine; (b) an injector (2) for injecting fuel into said engine; (c) a controller (8) for controlling a quantity of said injected fuel in response to an output of said air-flow sensor; (d) a throttle valve (5) for regulating a quantity of said suction air; (e) throttle valve opening detecting means for detecting an opening of said throttle valve; (f) rotational frequency detecting means (9) for detecting a rotational frequency of said engine; (g) means for limiting one of said quantity of said injected fuel or said output of said air-flow sensor to a maximum value; and (h) means for determining said maximum value in response to said output of said air-flow sensor and to outputs of said throttle valve opening detecting means and said rotational frequency detecting means, wherein said maximum value determining means includes: (i) searching means for finding a first maximum value of said one of said quantity of said injected fuel or said output of said air-flow sensor in response to said output of said rotational frequency detecting means; and correcting means for correcting said first maximum value in response to said outputs of said air-flow sensor, said throttle valve opening detecting means and said rotational frequency detecting means.
Claim 2
Dependent Claim
226 words
A fuel injection control system comprising: (a) an air-flow sensor (3) for detecting a quantity of suction air supplied to an internal combustion engine; (b) an injector (2) for injecting fuel into said engine; (c) a controller (8) for controlling a quantity of said injected fuel in response to an output of said air-flow sensor; (d) a throttle valve (5) for regulating a quantity of said suction air; (e) throttle valve opening detecting means for detecting an opening of said throttle valve; (f) rotational frequency detecting means (9) for detecting a rotational frequency of said engine; (g) means for limiting one of said quantity of said injected fuel or said output of said air-flow sensor to a maximum value; and (h) means for determining said maximum value in response to said output of said air-flow sensor and to outputs of said throttle valve opening detecting means and said rotational frequency detecting means, wherein said maximum value determining means includes: (i) searching means for finding a first maximum value of said one of said quantity of said injected fuel or said output of said air-flow sensor in response to said output of said rotational frequency detecting means; and correcting means for correcting said first maximum value in response to said outputs of said air-flow sensor, said throttle valve opening detecting means and said rotational frequency detecting means.
Claim 3
Dependent Claim
44 words
A fuel injection control system as recited in claim 1, wherein said correcting means are operative only within a predetermined range of at least one of said outputs of said air-flow sensor, said throttle valve opening detecting means and said rotation frequency detecting means.
Claim 4
Dependent Claim
72 words
A fuel injection control system as recited in claim 1, wherein said correcting means includes: estimating means for estimating a first value of said opening of said throttle valve in response to said outputs of said air-flow sensor and said rotational frequency detecting means; and ratio means for correcting said first maximum value according to a ratio of said first value to an actual value of said opening of said throttle valve.
Claim 5
Dependent Claim
58 words
A fuel injection control system as recited in claim 3, further comprising: temperature measuring means for measuring a temperature of said suction air; pressure measuring means for measuring a pressure of said suction air; and calculation means for calculating said actual valve of said opening of said throttle valve in respond to said temperature and pressue measuring means.
Claim 6
Dependent Claim
20 words
A fuel injection control system as recited in claim 1, wherein said air-flow sensor is a hot-wire air flow sensor.
References Cited (Backward Citations)
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Cited
JPS5773830A
Cited
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Cited
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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) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |