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EP0145992A2
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Method of controlling air-fuel ratio
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 A novel method of controlling air-fuel ratio for an internal combustion engine is disclosed, which comprises a memory area for holding regional compensation factors used for air-fuel ratio control, a memory area for holding new regional compensation factors obtained by learning, and a memory area for holding regional compensation factors based on the result of the learning immediately before the latest learning, thus rationalizing the new setting and updating processes of regional compensation factors according to the result of learning.
Inventors
- 👤 Matsuo Amano
- 👤 Masami Shida
- 👤 Masahide Sakamoto
- 👤 Takeshi Hirayama
- 👤 Takao Sasayama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 15:27
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2487; F02D41/2429; F02D41/2441; F02D41/2445; F02D41/2451; F02D41/2454; F02B; F02B1/00; F02B1/02; F02B1/04; F02D41/2477; F02D41/248
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
In an air-fuel ratio control method for an internal combustion engine wherein the operating conditions of the engine are controlled on the basis of compensation factors set by learning for a plurality of operating regions into which the operating conditions are divided according to the operating items such as the magnitude of engine speed (N) and load (Tp), the improvement further comprising means for holding said compensation factors as a plurality of independent memory data groups having a first group made up of compensation factors used for said control, a second group made up of compensation factors sequentially changed according to the result of the learning based on feedback control, and a third group made up of compensation factors for determining the timing of rewriting the compensation factors of the first group by the compensation factors of the second group.
Claim 2
Dependent Claim
140 words
In an air-fuel ratio control method for an internal combustion engine wherein the operating conditions of the engine are controlled on the basis of compensation factors set by learning for a plurality of operating regions into which the operating conditions are divided according to the operating items such as the magnitude of engine speed (N) and load (Tp), the improvement further comprising means for holding said compensation factors as a plurality of independent memory data groups having a first group made up of compensation factors used for said control, a second group made up of compensation factors sequentially changed according to the result of the learning based on feedback control, and a third group made up of compensation factors for determining the timing of rewriting the compensation factors of the first group by the compensation factors of the second group.
Claim 3
Dependent Claim
35 words
A method of controlling air-fuel ratio according to Claim 1, wherein a plurality of operating regions for mutually different operating items are provided, and compensation factors set for respective operating regions are used for control.
Claim 4
Dependent Claim
109 words
In a method of controlling air-fuel ratio wherein a basic value of the fuel supply amount of a fuel injection valve (4) is calculated in accordance with the intake air amount among the operating conditions of an internal combustion engine, and said basic value is corrected in accordance with the other operating conditions, the improvement further comprising the step of effecting compensation only when said basic value is reduced below the basic value of the fuel supply amount under idle state of the internal combustion engine, the operation of said compensation means being multiplication of a factor taking the value of 1 or less against the prevailing basic value.
Claim 5
Dependent Claim
109 words
In a method of controlling air-fuel ratio wherein a basic value of the fuel supply amount of a fuel injection valve (4) is calculated in accordance with the intake air amount among the operating conditions of an internal combustion engine, and said basic value is corrected in accordance with the other operating conditions, the improvement further comprising the step of effecting compensation only when said basic value is reduced below the basic value of the fuel supply amount under idle state of the internal combustion engine, the operation of said compensation means being multiplication of a factor taking the value of 1 or less against the prevailing basic value.
Claim 6
Dependent Claim
43 words
A method of controlling air-fuel ratio according to Claim 1, wherein said factor taking the value of 1 or less is determined by the learning based on the compensation of the air-fuel ratio at the time of deceleration of the internal combustion engine.
References Cited (Backward Citations)
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