EP0224195A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Air/fuel ratio control apparatus for internal combustion engines
Assignee: Hitachi Ltd
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Filing: 1986-11-20
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Granted: —
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Expires: 2006-11-20
Abstract
Abstract In feedback control for the air/fuel ratio based on a sensor (4) producing an output signal proportional to a change in the air/fuel ratio, a control constant modifier (10) is operative to vary the proportional component and the integration component in a feedback system (7, 8, 9) in accordance with an air/fuel ratio set for controlling, thereby assuring stability of ultimate fuel control.
Inventors
- 👤 Minoru Osuga
- 👤 Yoshishige Oyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 20:07
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1477; F02D41/1483; F02D41/1479; F02D41/1444; F02D41/1454; F02D41/1456
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
An air/fuel ratio control apparatus for an internal combustion emgine comprising: air/fuel ratio sensor means (4, 5, 6) for detecting an amount of oxygen or combustible component remaining in an exhaust gas to produce an output signal proportional to an air/fuel ratio in said engine (2); means (1, 6, 7, 8, 9) responsive to the output signal from said air/fuel ratio sensor means to control the air/fuel ratio of a mixture gas fed to said engine on the closed loop control basis; and means (7, 8, 10) for varying air/fuel ratio control constants used for the closed loop control in accordance with an air/fuel ratio set for controlling.
Claim 2
Dependent Claim
108 words
An air/fuel ratio control apparatus for an internal combustion emgine comprising: air/fuel ratio sensor means (4, 5, 6) for detecting an amount of oxygen or combustible component remaining in an exhaust gas to produce an output signal proportional to an air/fuel ratio in said engine (2); means (1, 6, 7, 8, 9) responsive to the output signal from said air/fuel ratio sensor means to control the air/fuel ratio of a mixture gas fed to said engine on the closed loop control basis; and means (7, 8, 10) for varying air/fuel ratio control constants used for the closed loop control in accordance with an air/fuel ratio set for controlling.
Claim 3
Dependent Claim
43 words
An air/fuel ratio control apparatus according to Claim 1 wherein said air/fuel ratio control constants includes an integration constant and a proportional constant, and either one or both of the two constants are varied in accordance with the air/fuel ratio set for controlling.
Claim 4
Dependent Claim
50 words
An air/fuel ratio control apparatus according to Claim 2 wherein the proportional and integration constants for a first region where the air/fuel ratio is larger than the stoichiometric air/fuel ratio is made different from those for a second region where the air/fuel ratio is smaller than the stoichiometric air/fuel ratio.
Claim 5
Dependent Claim
27 words
An air/fuel ratio control apparatus according to Claim 3 wherein the proportional and integration constants are varied continuously in accordance with the air/fuel ratio set for controlling.
Claim 6
Dependent Claim
28 words
An air/fuel ratio control apparatus according to Claim 3 wherein the proportional and integration constants for said first region are made larger than those for said second region.
Claim 7
Dependent Claim
90 words
An air/fuel ratio control apparatus using an air/fuel ratio sensor (4) for detecting an amount of oxygen or combustible component remaining in an exhaust gas to produce an output signal proportional to an air/fuel ratio in an engine (2) and performing closed loop control of the air/fuel ratio of a mixture gas fed to said engine on the basis of the output signal from said air/fuel ratio sensor, wherein air/fuel ratio control constants used for the closed loop control are varied in accordance with an air/fuel ratio set for controlling.
Claim 8
Dependent Claim
90 words
An air/fuel ratio control apparatus using an air/fuel ratio sensor (4) for detecting an amount of oxygen or combustible component remaining in an exhaust gas to produce an output signal proportional to an air/fuel ratio in an engine (2) and performing closed loop control of the air/fuel ratio of a mixture gas fed to said engine on the basis of the output signal from said air/fuel ratio sensor, wherein air/fuel ratio control constants used for the closed loop control are varied in accordance with an air/fuel ratio set for controlling.
References Cited (Backward Citations)
No citation records indexed.
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