US4611560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Idling speed control system of an internal combustion engine
Assignee: Mitsubishi Electric Corp
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Filing: 1984-04-07
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Granted: 1986-09-16
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Expires: 2004-04-07
Abstract
Abstract PCT No. PCT/JP84/00175 Sec. 371 Date Dec. 7, 1984 Sec. 102(e) Date Dec. 7, 1984 PCT Filed Apr. 7, 1984.The present invention is adapted for providing an idling speed control system of an internal combustion engine, which exhibits a good response for changes in an engine load, comprising: a throttle valve which controls the amount of intake air for the engine; an actuator which includes an electric motor for variably controlling the opening of the throttle valve; a rotation speed detector for detecting the rotation speed of the engine; an idling condition detector for detecting the idling condition of the engine; and a control, responsive to the detected output of the idling condition detector means, for generating feedback control pulses to intermittently drive said electric motor so that the detected rotation speed of the engine under the idling condition may converge into a target idling rotation speed while, responsive to the output of a detector that detects the operation condition of the engine load operated under the idling condition of the engine, or to the detected output of said rotation speed detector indicating that the detected rotation speed has dropped to an abnormally low rotation speed of the engine, for generating drive control pulses at a time independent of said feedback control pulses to drive said electric motor in a predetermined direction.
Inventors
- 👤 Masaaki Miyazaki
- 👤 Mitsuaki Ishii
- 👤 Hajime Kako
- 👤 Noboru Nakamura
- 👤 Hideo Kakinuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:53
CPC Classifications
F; F02; F02D; F02D31/00; F02D31/001; F02D31/002; F02D31/003; F02D31/004; F02D41/00; F02D41/02; F02D41/04; F02D41/08; F02D41/083
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
An idling speed control system of an internal combustion engine comprising: a valve device which controls the amount of intake air for the engine; an actuator which includes an electric motor for variably controlling the opening of said valve device; rotation speed detector means for detecting the rotation speed of the engine; idling condition detector means for detecting the idling condition of the engine; feedback control means responsive to the detected output of said idling condition detector means for generating feedback control pulses to intermittently drive said electric motor so that said detected rotation speed of the engine under the idling condition may converge into a target idling rotation speed; and control means responsive to the output of detector means that detects an abnormally low rotation speed of the engine detected by said rotation speed detector means for generating control pulses that do not overlap said feedback control pulses to drive said electric motor in a predetermined direction.
Claim 2
Dependent Claim
158 words
An idling speed control system of an internal combustion engine comprising: a valve device which controls the amount of intake air for the engine; an actuator which includes an electric motor for variably controlling the opening of said valve device; rotation speed detector means for detecting the rotation speed of the engine; idling condition detector means for detecting the idling condition of the engine; feedback control means responsive to the detected output of said idling condition detector means for generating feedback control pulses to intermittently drive said electric motor so that said detected rotation speed of the engine under the idling condition may converge into a target idling rotation speed; and control means responsive to the output of detector means that detects an abnormally low rotation speed of the engine detected by said rotation speed detector means for generating control pulses that do not overlap said feedback control pulses to drive said electric motor in a predetermined direction.
Claim 3
Dependent Claim
233 words
An idling speed control system of an internal combustion engine comprising: a valve device which controls the amount of intake air for the engine; an actuator which includes an electric motor for variably controlling the opening of said valve device; rotation speed detector means for detecting the number of revolutions of the engine; idling condition detector means for detecting the idling condition of the engine; engine load condition detector means for detecting the operation condition of an engine load under the idling condition of said engine; feedback control means responsive to the detected output of said idling condition detector means for generating feedback control pulses to intermittently drive said electric motor so as to converge said detected rotation speed of the engine under the idling condition into a target idling rotation speed; first control means responsive to an operation condition of an engine load under the idling condition of the engine detected by said engine load condition detector means for generating drive control pulses at a time such that said drive pulses do not overlap said feedback control pulses to drive said electric motor in a predetermined direction; and second control means for determining the time of the generation of said feedback control pulses relative to the generation of said drive control pulses such that said feedback control pulses are generated at a predetermined time from the generation of said drive control pulses.
Claim 4
Dependent Claim
233 words
An idling speed control system of an internal combustion engine comprising: a valve device which controls the amount of intake air for the engine; an actuator which includes an electric motor for variably controlling the opening of said valve device; rotation speed detector means for detecting the number of revolutions of the engine; idling condition detector means for detecting the idling condition of the engine; engine load condition detector means for detecting the operation condition of an engine load under the idling condition of said engine; feedback control means responsive to the detected output of said idling condition detector means for generating feedback control pulses to intermittently drive said electric motor so as to converge said detected rotation speed of the engine under the idling condition into a target idling rotation speed; first control means responsive to an operation condition of an engine load under the idling condition of the engine detected by said engine load condition detector means for generating drive control pulses at a time such that said drive pulses do not overlap said feedback control pulses to drive said electric motor in a predetermined direction; and second control means for determining the time of the generation of said feedback control pulses relative to the generation of said drive control pulses such that said feedback control pulses are generated at a predetermined time from the generation of said drive control pulses.
Claim 5
Dependent Claim
205 words
An idling speed control system of an internal combustion engine comprising: a valve device which controls the amount of intake air for the engine; an actuator which includes an electric motor for variably controlling the opening of said valve device; rotation speed detector means for detecting the rotation speed of the engine; idling condition detector means for detecting the idling condition of the engine; feedback control means responsive to the detected output of said idling condition detector means for generating feedback control pulses to intermittently drive said electric motor so as to converge said detected rotation speed of the engine under the idling condition into a target idling rotation speed; first control means responsive to an abnormally low rotation speed of the engine detected by said rotation speed detector means for generating drive control pulses at a time such that said drive pulses do not overlap said feedback control pulses to drive said electric motor in a predetermined direction; and second control means for determining the time of the generation of said feedback control pulses relative to the generation of said drive control pulses such that said feedback control pulses are generated at a predetermined hold time from the generation of said drive control pulses.
Claim 6
Dependent Claim
205 words
An idling speed control system of an internal combustion engine comprising: a valve device which controls the amount of intake air for the engine; an actuator which includes an electric motor for variably controlling the opening of said valve device; rotation speed detector means for detecting the rotation speed of the engine; idling condition detector means for detecting the idling condition of the engine; feedback control means responsive to the detected output of said idling condition detector means for generating feedback control pulses to intermittently drive said electric motor so as to converge said detected rotation speed of the engine under the idling condition into a target idling rotation speed; first control means responsive to an abnormally low rotation speed of the engine detected by said rotation speed detector means for generating drive control pulses at a time such that said drive pulses do not overlap said feedback control pulses to drive said electric motor in a predetermined direction; and second control means for determining the time of the generation of said feedback control pulses relative to the generation of said drive control pulses such that said feedback control pulses are generated at a predetermined hold time from the generation of said drive control pulses.
Claim 7
Dependent Claim
22 words
An idling speed control system of an internal combustion engine according to claim 2, wherein the engine load comprises an air-conditioning apparatus.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |