Patent EP0142856A2 successfully refreshed from Google Patents.
EP0142856A2
Expired / Lapsed
EP
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Air-fuel ratio control apparatus for internal combustion engines
Assignee: Hitachi Ltd
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Filing: 1984-11-20
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Granted: —
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Expires: 2004-11-20
Abstract
Abstract An air-fuel ratio control apparatus for an internal combustion engine accurately controls the air-fuel ratio of a mixture by first determining the desired fuel injection quantity (Tp) in accordance with the engine speed (N) and the amount of depression (θAC) of the accelerator pedal (8),then determining the desired amount of intake air flow (Q'a) and finally controlling the opening of the throttle valve (3) in accordance with the desired amount of intake air flow (Q'a).
Inventors
- 👤 Takeshi Atago
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 15:58
CPC Classifications
F; F02; F02D; F02D43/00; F02D31/00; F02D31/001; F02D31/002; F02D41/00; F02D41/02; F02D41/04; F02D41/10; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
176 words
In an electronic air-fuel ratio control apparatus for an internal combustion engine including a throttle actuator (4) for varying the opening of a throttle valve (3) arranged in an intake passage of said engine and at least one fuel injection valve (5) positioned upstream or downstream of said throttle valve (3) to inject a fuel whereby controlling the air-fuel ratio of a mixture supplied to combustion chambers of said engine, the improvement comprising: a first sensor (13) for detecting a rotational speed (N) of said engine; a second sensor (9) for detecting an operation command quantity (θ AC ) by a driver; first computing means (step 83) responsive to output signals from said first and second sensors (13, 9) to compute a quantity (Tp) of fuel injected from said fuel injection valve (5); and second computing means (step 84) responsive to said fuel injection quantity (Tp) computed by said first computing means for computing an optimum throttle actuator drive signal (θ TO ) and thereby driving said throttle actuator (4) to attain an optimum throttle opening.
Claim 2
Dependent Claim
176 words
In an electronic air-fuel ratio control apparatus for an internal combustion engine including a throttle actuator (4) for varying the opening of a throttle valve (3) arranged in an intake passage of said engine and at least one fuel injection valve (5) positioned upstream or downstream of said throttle valve (3) to inject a fuel whereby controlling the air-fuel ratio of a mixture supplied to combustion chambers of said engine, the improvement comprising: a first sensor (13) for detecting a rotational speed (N) of said engine; a second sensor (9) for detecting an operation command quantity (θ AC ) by a driver; first computing means (step 83) responsive to output signals from said first and second sensors (13, 9) to compute a quantity (Tp) of fuel injected from said fuel injection valve (5); and second computing means (step 84) responsive to said fuel injection quantity (Tp) computed by said first computing means for computing an optimum throttle actuator drive signal (θ TO ) and thereby driving said throttle actuator (4) to attain an optimum throttle opening.
Claim 3
Dependent Claim
98 words
An apparatus according to claim 1, wherein the computation of said first computing means is effected by using an amount of intake air flow (Q'a) read from a'first memory (Fig. 7) in accordance with the output signals (N, 8 AC ) from said first and second sensors (13, 9), and wherein the computation of said second computing means is effected by reading said throttle actuator drive signal (θ TO ) ) from a second memory (Fig. 9) in accordance with the output signal (N) from said first sensor (13) and said computed fuel injection quantity (T P ).
Claim 4
Dependent Claim
39 words
An apparatus according to claim 1, wherein said fuel injection valve (5) is provided for each of a plurality of cylinders of said engine, and wherein said fuel injection valves (5) are positioned downstream of said throttle valve (3).
Claim 5
Dependent Claim
39 words
An apparatus according to claim 1, wherein only one said fuel injection valve (5) is provided for a plurality of cylinders of said engine, and wherein said fuel injection valve (5) is positioned upstream of said throttle valve (3).
References Cited (Backward Citations)
No citation records indexed.
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