EP0087809A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electrical fuel injector control
Assignee: Hitachi Ltd
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Filing: 1983-03-02
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Granted: —
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Expires: 2003-03-02
Abstract
Abstract n an electrical fuel injector which comprises an air flow meter (9) for detecting an amount of air intake to an internal combustion engine, a revolution counter (20) for measuring the rate of rotations of the internal combustion engine, and an electronic circuit adapted to arithmetically control an opening time of an injection valve for injecting fuel into the internal combustuion engine based on output signals from both air flow meter (9) and revolution counter (20), this invention includes a digital filter (15) which has a gain variable in accordance with drive conditions of the internal combustion engine, so that the output signal from the air flow meter (9) is applied to the electronic circuit through the digital filter.
Inventors
- 👤 Masami Nagano
- 👤 Takeshi Atago
- 👤 Tatsuya Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 06:02
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/24; F02D41/26; F02D41/28; F02D41/02; F02D41/18; F02D41/182; F02D41/187; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02D41/14; F02D41/1401; F02D2041/1413; F02D2041/1432
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
128 words
An electrical fuel injector comprising; an injection valve for injecting fuel into an internal combustion engine; an air flow detector for detecting an amount of intake air fed to said internal combustion engine through a throttle valve; a revolution counter for measuring the rate of rotations of said internal combustion engine; and an electronic circuit for determining an opening and closing time of said injection valve based on output signals from both said air flow meter and said revolution counter, characterized in that there is provided a first digital filter (15) which has a gain variable in accordance with the drive conditions of said internal combustion engine, and the output signal from said air flow meter (9) is applied to said electronic circuit through said first digital filter.
Claim 2
Dependent Claim
128 words
An electrical fuel injector comprising; an injection valve for injecting fuel into an internal combustion engine; an air flow detector for detecting an amount of intake air fed to said internal combustion engine through a throttle valve; a revolution counter for measuring the rate of rotations of said internal combustion engine; and an electronic circuit for determining an opening and closing time of said injection valve based on output signals from both said air flow meter and said revolution counter, characterized in that there is provided a first digital filter (15) which has a gain variable in accordance with the drive conditions of said internal combustion engine, and the output signal from said air flow meter (9) is applied to said electronic circuit through said first digital filter.
Claim 3
Dependent Claim
116 words
'2. An electrical fuel injector comprising; an injection valve for injecting fuel into an internal combustion engine; an air flow detector for detecting an amount of intake air fed to said internal combustion engine through a throttle valve; a revolution counter for measuring the rate of rotations of said internal combustion engine; and an electronic circuit for determining an opening and closing time of said injection valve based on output signals from both said air flow meter and said revolution counter, characterized in that there is provided a second digital filter (15) having a constant gain so as to change the output signal from said revolution counter (20) and then apply it to said electronic circuit.
Claim 4
Dependent Claim
116 words
'2. An electrical fuel injector comprising; an injection valve for injecting fuel into an internal combustion engine; an air flow detector for detecting an amount of intake air fed to said internal combustion engine through a throttle valve; a revolution counter for measuring the rate of rotations of said internal combustion engine; and an electronic circuit for determining an opening and closing time of said injection valve based on output signals from both said air flow meter and said revolution counter, characterized in that there is provided a second digital filter (15) having a constant gain so as to change the output signal from said revolution counter (20) and then apply it to said electronic circuit.
Claim 5
Dependent Claim
127 words
An electrical fuel injector comprising; an injection valve for injecting fuel into an internal combustion engine; an air flow detector for detecting an amount of intake air fed to said internal combustion engine through a throttle valve; a revolution counter for measuring the rate of rotations of said internal combustion engine; and an electronic circuit for determining an opening and closing time of said injection valve based on output signals from both said air flow meter and said revolution counter, characterized in that there is provided a third digital filter (15) which has a gain variable in accordance with the drive conditions of said internal combustion engine, and the output signal from said revolution counter (20) is applied to said electronic circuit through said third digital filter.
Claim 6
Dependent Claim
127 words
An electrical fuel injector comprising; an injection valve for injecting fuel into an internal combustion engine; an air flow detector for detecting an amount of intake air fed to said internal combustion engine through a throttle valve; a revolution counter for measuring the rate of rotations of said internal combustion engine; and an electronic circuit for determining an opening and closing time of said injection valve based on output signals from both said air flow meter and said revolution counter, characterized in that there is provided a third digital filter (15) which has a gain variable in accordance with the drive conditions of said internal combustion engine, and the output signal from said revolution counter (20) is applied to said electronic circuit through said third digital filter.
Claim 7
Dependent Claim
42 words
An electrical fuel injector according to Claim 1, characterized in that it includes a second digital filter (15) having a constant gain so as to change the output signal from said revolution counter (20) and then apply it to said electronic circuit.
Claim 8
Dependent Claim
53 words
An electrical fuel injector according to Claim 1, which further includes a third digital filter (15) which has a gain variable in accordance with the drive conditions of said internal combustion engine, so that the output signal from said revolution counter (20) is applied to said electronic circuit through said third digital filter.
Claim 9
Dependent Claim
101 words
An electrical fuel injector according to Claim 1, characterized in that said first digital filter is so constituted that its gain is variable upon whether at least one signal among an ON or OFF signal from an idle switch (21) for detecting an opening degree of said throttle valve, the output signal from said revolution counter (20), the output signal from said air flow meter (9), and a fuel injection pulse in proportion to a value obtained by dividing the output signal from said air flow meter by the output signal from said revolution counter reaches a predetermined value or not.
Claim 10
Dependent Claim
103 words
An electrical fuel injector according to Claim 3 or 5, characterized in that said third digital filter is so constituted that its gain is variable upon whether at least one signal among an ON or OFF signal from an idle switch (21) for detecting an opening degree of said throttle valve, the output signal from said revolution counter (20), the output signal from said air flow meter (9), and a fuel injection pulse in proportion to a value obtained by dividing the output signal from said air flow meter by the output signal from said revolution counter reaches a predetermined value or not.
References Cited (Backward Citations)
No citation records indexed.
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