EP0217391A2
Expired / Lapsed
EP
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Fuel injection control system for internal combustion engines
Assignee: Mitsubishi Electric Corp
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Filing: 1986-10-02
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Granted: —
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Expires: 2006-10-02
Abstract
Abstract A fuel injection control system intended to correct for return blow. First. the sensed throttle valve opening is corrected according to the engine's rotation rate to provide a correction factor. Then this correction factor is combined with a sensed air-flow signal and an air temperature signal to provide a corrected air-flow amount.
Inventors
- 👤 Seiji Mitsubishi Denki K.K. Wataya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 14:35
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32; F02D41/34; F02D41/02; F02D41/18; F02D41/187
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
A fuel injection control system comprising: an air flow sensor (3) for detecting a quantity of suction air supplied to an internal combustion engine (1); an injector (2) for injecting fuel into said engine; a controller (8) for controlling a quantity of said injected fuel responsive to an output of said air-flow sensor; a throttle valve (5) for regulating a quantity of said suction air; throttle valve opening detecting means (15) for detecting an opening of said throttle valve; rotational frequency detecting means (103) for detecting a rotational frequency of said engine; means (16) for measuring a temperature of said suction air; first correcting means (101, 102) responsive to outputs of said throttle valve opening detecting means (15) and said rotational frequency detecting means (103) for correcting said output of said air-flow sensor in a return blow region of said engine; second correcting means (101, 102) responsive to outputs of said first correcting means and of said temperature measuring means; and means responsive to an output of said second correcting means (101, 102) for determining a quantity of said injected fuel.
Claim 2
Dependent Claim
181 words
A fuel injection control system comprising: an air flow sensor (3) for detecting a quantity of suction air supplied to an internal combustion engine (1); an injector (2) for injecting fuel into said engine; a controller (8) for controlling a quantity of said injected fuel responsive to an output of said air-flow sensor; a throttle valve (5) for regulating a quantity of said suction air; throttle valve opening detecting means (15) for detecting an opening of said throttle valve; rotational frequency detecting means (103) for detecting a rotational frequency of said engine; means (16) for measuring a temperature of said suction air; first correcting means (101, 102) responsive to outputs of said throttle valve opening detecting means (15) and said rotational frequency detecting means (103) for correcting said output of said air-flow sensor in a return blow region of said engine; second correcting means (101, 102) responsive to outputs of said first correcting means and of said temperature measuring means; and means responsive to an output of said second correcting means (101, 102) for determining a quantity of said injected fuel.
Claim 3
Dependent Claim
20 words
A fuel injection control system as recited in claim 1, wherein said air-flow sensor (3) is a hot-wire air-flow sensor.
Claim 4
Dependent Claim
27 words
A fuel injection control system as recited in claim 1, further comprising third means (104) responsive to said temperature measuring means (16) for correcting said rotational frequency.
Claim 5
Dependent Claim
62 words
A fuel injection control system as recited in claim 1, wherein said first correcting means (101, 102) corrects said output of said air-flow sensor (3) according to a correction factor selected from a map in a memory (101) of said first correcting means according to said outputs of said throttle valve opening detecting means (15) and said rotational frequency detecting means (103).
Claim 6
Dependent Claim
34 words
A fuel injection control system as recited in claim 3, wherein said third correcting means (104) corrects said rotational frequency in proportion to a square root of an absolute temperature of said suction air.
References Cited (Backward Citations)
No citation records indexed.
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