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EP0162470A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

A method for controlling the fuel supply of an internal combustion engine

Assignee: Honda Motor Co Ltd
•
Filing: 1985-05-23
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Granted: —
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Expires: 2005-05-23
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Abstract

Abstract There is a method for controlling the fuel supply of an internal combustion engine having a throttle valve in the intake air system. It is detected that an angular position of a crankshaft of the engine coincides with a predetermined crankshaft angular position. Whenever this coincidence is detected, the pressure in the intake air passage downstream of the throttle valve and the engine rotating speed or the value of the inverse number thereof is detected on the basis of the interval between the detections of the crankshaft angular position. The reference basic fuel supply amount into the engine is determined in accordance with the present de- : tection value P BAn of the pressure in the intake air passage. The present reference value M eAVEn having predetermined functional relations with regard to the present detection value M on and previous reference value M eAVEn(n-1) of the engine speed or of the value of the inverse number thereof is set. The correction fuel supply amount is decided on the basis of the present reference value M eAVEn and is added to the basic fuel supply amount. Then the injection amount of fuel as much as the result of this addition is supplied into the engine. Thus, a driveability of the engine is improved.

Inventors

  • 👤 Akihiro Yamato

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 03:50
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/10; F02D41/08; F02D41/24; F02D41/26; F02D41/30; F02D41/32; F02D41/34; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 213 words
A method for controlling the fuel supply of an internal combustion engine having a throttle valve in an intake air system comprising the steps of: detecting that an angular position of a crankshaft of the engine coincides with a predetermined crankshaft angular position; detecting at every detection of said coincidence a pressure in an intake air passage downstream of said throttle valve and a rotating speed of the engine or a value of the inverse number of said engine rotating speed on the-basis of an interval between the detections of said predetermined crankshaft angular position; determining a basic amount of fuel which is supplied into the engine in accordance with a present detection value P BAn of said pressure in the intake air passage; setting a present reference value M eAVEn having predetermined functional relations with regard to a present detection value M en of said engine rotating speed or the value of the inverse number thereof and to an reference value M eAVE(n-1) one sampling before; determining a correction fuel supply amount cn the basis of said present reference value M eAVEn ; adding said correction fuel supply amount to said basic fuel supply amount; and supplying an injection amount of fuel commensurated with the result of said addition into the engine.
Claim 2
Independent Claim 213 words
A method for controlling the fuel supply of an internal combustion engine having a throttle valve in an intake air system comprising the steps of: detecting that an angular position of a crankshaft of the engine coincides with a predetermined crankshaft angular position; detecting at every detection of said coincidence a pressure in an intake air passage downstream of said throttle valve and a rotating speed of the engine or a value of the inverse number of said engine rotating speed on the-basis of an interval between the detections of said predetermined crankshaft angular position; determining a basic amount of fuel which is supplied into the engine in accordance with a present detection value P BAn of said pressure in the intake air passage; setting a present reference value M eAVEn having predetermined functional relations with regard to a present detection value M en of said engine rotating speed or the value of the inverse number thereof and to an reference value M eAVE(n-1) one sampling before; determining a correction fuel supply amount cn the basis of said present reference value M eAVEn ; adding said correction fuel supply amount to said basic fuel supply amount; and supplying an injection amount of fuel commensurated with the result of said addition into the engine.
Claim 3
Dependent Claim 68 words
A method according to claim 1, wherein said present reference value M eAVEn is obtained from a following equation in which, A is a constant and M REF (1≦M REF ≦A-1) is a constant to give a degree of averaging of the detection value M en of said engine rotating speed or of the value of the inverse number of said engine rotating speed until the present calculation.
Claim 4
Dependent Claim 34 words
A method according to claim 1, wherein said correction fuel supply amount is determined depending on a subtraction value ΔM eAVE between said detection value M en and said reference value M eAVEn .
Claim 5
Dependent Claim 50 words
A method according to claim 3, further comprising the steps of discriminating whether said subtraction value ΔM eAVE is positive or negative and multiplying a constant α, which differs depending on the result of said discrimination, to said subtraction value ΔM eAVE and thereby determining said correction fuel supply amount.
Claim 6
Dependent Claim 62 words
A method according to claim 1, wherein when said correction fuel supply amount exceeds an upper limit value, the correction fuel supply amount is set to be equal to said upper limit value, and when the correction fuel supply amount becomes smaller than a lower limit value, the correction fuel supply amount is set to be equal to said lower limit value.

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