Patent EP0363958A2 successfully refreshed from Google Patents.
EP0363958A2
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EP
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Method and apparatus for controlling the fuel injection for internal combustion engines
Assignee: Hitachi Ltd
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Filing: 1989-10-12
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Granted: —
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Expires: 2009-10-12
Abstract
Abstract Disclosed is a fuel injection control apparatus and method for internal combustion engines comprising a controller, which includes a microprocessor for executing a predetermined processing in response to fundamental parameters representing the operational condition of the engine, produces a basic fuel injection pulse on the basis of a suction air quantity and a rotational speed of the engine and corrects the basic fuel injection pulse in accordance with the degree of the acceleration or deceleration required thereby to provide a fuel injection pulse applied to a fuel injector. The microprocessor is provided with membership functions (f₁ - f₄), each function varying with respect to the acceleration or deceleration, and determines by using the membership functions a correction coefficient (k₁, k₂) for correcting the basic fuel injection pulse on the basis of the required degree of acceleration or deceleration, said membership functions (f₁ - f₄) defining a driver's action in operating the engine.
Inventors
- 👤 Tomiya Itakura
- 👤 Hiroshi Kamifuji
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:03
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; F02D41/1404; F02D41/04; F02D41/10; F02D41/24; F02D41/2406; F02D41/2409; F02D41/2422; Y; Y10; Y10S; Y10S706/00; Y10S706/90
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
198 words
A fuel injection control apparatus for internal combustion engines, comprising: fuel injecting means for supplying fuel to the engine in response to a fuel injection pulse applied thereto; sensing means for detecting fundamental parameters representing the operational condition of the engine to produce signals corresponding to each detected amount of the parameters, the fundamental parameters including at least an acceleration or deceleration required to be effected by the engine; and controlling means, including a microprocessor for executing a predetermined processing in response to the signals of said sensing means, for producing a basic fuel injection pulse, a pulse width of which is determined based on the fundamental parameters, and correcting the pulse width of the basic fuel injection pulse in accordance with the degree of the acceleration or deceleration required thereby to provide the fuel injection pulse to said fuel injecting means, characterized in that the microprocessor - stores in advance membership functions, each function varying with respect to acceleration or deceleration, and - determines by using the membership functions a correction coefficient for correcting the basic fuel injection pulse on the basis of the degree of acceleration or deceleration required by means of the respective driver's action.
Claim 2
Dependent Claim
198 words
A fuel injection control apparatus for internal combustion engines, comprising: fuel injecting means for supplying fuel to the engine in response to a fuel injection pulse applied thereto; sensing means for detecting fundamental parameters representing the operational condition of the engine to produce signals corresponding to each detected amount of the parameters, the fundamental parameters including at least an acceleration or deceleration required to be effected by the engine; and controlling means, including a microprocessor for executing a predetermined processing in response to the signals of said sensing means, for producing a basic fuel injection pulse, a pulse width of which is determined based on the fundamental parameters, and correcting the pulse width of the basic fuel injection pulse in accordance with the degree of the acceleration or deceleration required thereby to provide the fuel injection pulse to said fuel injecting means, characterized in that the microprocessor - stores in advance membership functions, each function varying with respect to acceleration or deceleration, and - determines by using the membership functions a correction coefficient for correcting the basic fuel injection pulse on the basis of the degree of acceleration or deceleration required by means of the respective driver's action.
Claim 3
Dependent Claim
37 words
The apparatus according to claim 1, characterized in that the microprocessor is adapted to define the degree of acceleration/deceleration required by the driver's action by detecting the change rate of the throttle valve position (Δϑ t ).
Claim 4
Dependent Claim
19 words
The apparatus according to claim 1, wherein the membership functions vary linearly with respect to the acceleration or deceleration.
Claim 5
Dependent Claim
26 words
The apparatus according to claim 1, wherein the membership functions have a non-sensitive zone at least in the region where the acceleration or deceleration is small.
Claim 6
Dependent Claim
33 words
The apparatus according to claim 1, wherein there are provided various kinds of the membership functions and a set of the membership functions is selected in accordance with the temperature of the engine.
Claim 7
Dependent Claim
31 words
The apparatus according to claim 1, wherein the degree of the acceleration or deceleration required is detected by a change rate of an opening of a throttle valve of the engine.
Claim 8
Dependent Claim
25 words
The apparatus according to claim 6, wherein each membership function varies linearly with respect to the changing rate of the opening of the throttle valve.
Claim 9
Dependent Claim
32 words
The apparatus according to claim 6, wherein the membership functions have a non-sensitive zone at least in the region where the changing rate of the opening of the throttle valve is small.
Claim 10
Dependent Claim
157 words
The apparatus according to claim 6, wherein the microprocessor executes the following steps: a first step of reading at least a quantity of air sucked into the engine, a rotational speed of the engine and the opening of the throttle valve; a second step of determining a pulse width T i ′ of the basic fuel injection pulse on the basis of the quantity of the suction air and the rotational speed read at the first step; a third step of calculating the changing rate of the opening of the throttle valve read at the first step; a fourth step of determining the correction coefficient k₂ on the basis of the membership functions and the changing rate of the opening calculated at the third step; and a fifth step of calculating a pulse width T i of the fuel injection pulse in accordance with the following formula: T i = T i ′ x (1 - k₂).
Claim 11
Dependent Claim
86 words
The apparatus according to claim 9, wherein the fourth step includes: a step of obtaining functional values of the membership functions in response to the changing rate of the opening of the throttle valve; a step of calculating an area of a figure, which is formed on the basis of the functional values obtained at the previous step; a step of obtaining a centroid of the figure; and a step of determining the correction coefficient on the basis of the thus obtained centroid of the figure.
Claim 12
Dependent Claim
169 words
A fuel injection control method for internal combustion engines comprising the steps of: - supplying fuel to the engine by fuel injecting means in response to a fuel injection pulse applied thereto; - detecting fundamental parameters representing the operational condition of the engine to produce signals corresponding to each detected amount of the parameters, the fundamental parameters including at least an acceleration or deceleration required to be effected by the engine; and - producing a basic fuel injection pulse, a pulse width of which is determined based on the fundamental parameters, and correcting the pulse width of the basic fuel injection pulse in accordance with the degree of the acceleration or deceleration required thereby, characterized by following steps: - storing in advance membership functions, each function varying with respect to acceleration or deceleration, and - determining by using the membership functions a correction coefficient for correcting the basic fuel injection pulse on the basis of the degree of acceleration or deceleration required by means of the respective driver's action.
Claim 13
Dependent Claim
169 words
A fuel injection control method for internal combustion engines comprising the steps of: - supplying fuel to the engine by fuel injecting means in response to a fuel injection pulse applied thereto; - detecting fundamental parameters representing the operational condition of the engine to produce signals corresponding to each detected amount of the parameters, the fundamental parameters including at least an acceleration or deceleration required to be effected by the engine; and - producing a basic fuel injection pulse, a pulse width of which is determined based on the fundamental parameters, and correcting the pulse width of the basic fuel injection pulse in accordance with the degree of the acceleration or deceleration required thereby, characterized by following steps: - storing in advance membership functions, each function varying with respect to acceleration or deceleration, and - determining by using the membership functions a correction coefficient for correcting the basic fuel injection pulse on the basis of the degree of acceleration or deceleration required by means of the respective driver's action.
Claim 14
Dependent Claim
35 words
The method according to claim 11, characterized in that the degree of acceleration or deceleration required by the driver's action is defined by detecting the change rate of the throttle valve position (Δϑ t ).
Claim 15
Dependent Claim
19 words
The method according to claim 11, wherein the membership functions vary linearly with respect to the acceleration or deceleration.
Claim 16
Dependent Claim
26 words
The method according to claim 11, wherein the membership functions have a non-sensitive zone at least in the region where the acceleration or deceleration is small.
Claim 17
Dependent Claim
33 words
The method according to claim 11, wherein there are provided various kinds of the membership functions and a set of the membership functions is selected in accordance with the temperature of the engine.
Claim 18
Dependent Claim
31 words
The method according to claim 11, wherein the degree of the acceleration or deceleration required is detected by a change rate of an opening of a throttle valve of the engine.
Claim 19
Dependent Claim
25 words
The method according to claim 16, wherein each membership function varies linearly with respect to the changing rate of the opening of the throttle valve.
Claim 20
Dependent Claim
32 words
The method according to claim 16, wherein the membership functions have a non-sensitive zone at least in the region where the changing rate of the opening of the throttle valve is small.
Claim 21
Dependent Claim
134 words
The method according to claim 16, characterized by the following further steps: - detecting at least a quantity of air sucked into the engine, a rotational speed of the engine and the opening of the throttle valve; - determining a pulse width T i ′ of the basic fuel injection pulse on the basis of the quantity of the suction air and the rotational speed read at the first step; - calculating the changing rate of the detected opening of the throttle valve; - determining the correction coefficient k₂ on the basis of the membership functions and the calculated changing rate of the opening calculated; and - calculating a pulse width T i of the fuel injection pulse in accordance with the following formula: T i = T i ′ x (1 - k₂).
Claim 22
Dependent Claim
86 words
The method according to claim 19, wherein for determination of the correction coefficient (k₂) following steps are carried out: - obtaining functional values of the membership functions in response to the changing rate of the opening of the throttle valve; - calculating an area of a figure, which is formed on the basis of the functional values obtained at the previous step; - obtaining a centroid of the figure; and - determining the correction coefficient on the basis of the thus obtained centroid of the figure.
References Cited (Backward Citations)
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