Patent US2565902A successfully refreshed from Google Patents.
Patent US5113347A successfully refreshed from Google Patents.
US5113347A
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Internal combustion engine speed controller for controlling a throttle valve bypass with respect to the atmospheric pressure
Assignee: Mitsubishi Electric Corp
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Filing: 1990-07-20
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Granted: 1992-05-12
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Expires: 2010-07-20
Abstract
Abstract An engine speed control apparatus including an air control valve which controls the cross-sectional area of a bypass passage provided so as to bypass the throttle valve of the engine. The apparatus also includes a control unit which controls a degree of opening of the air control valve on the basis of a synthesized quantity which is obtained by synthesizing a basic air quantity for maintaining a target engine speed and an engine speed feed-back correction quantity which effects to eliminate an error between the target speed and an actual engine speed. An atmosphere pressure sensor is used to detect an atmospheric pressure, and a correction circuit is used to ensure that the synthesized quantity corresponds with the detected atmospheric pressure the engine is started.
Inventors
- 👤 Hirofumi Ohuchi
- 👤 Hajime Kako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:23
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D31/00; F02D31/001; F02D31/002; F02D31/003; F02D31/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
An engine speed control apparatus for an internal combustion engine which comprises: an air control valve which controls the cross-sectional area of a bypass passage provided so as to bypass the throttle value of the engine; a control unit which controls a degree of opening of said air control valve on the basis of a synthesized quantity which is obtained by synthesizing a basic air quantity for maintaining a target engine speed and an engine speed feed-back correction quantity which effects to eliminate an error between the target speed and an actual engine speed; an atmospheric pressure detecting means to detect an atmospheric pressure, and a correction means for correcting said synthesized quantity based upon the detected atmospheric pressure every time the engine is started and only during an engine starting operation.
Claim 2
Dependent Claim
132 words
An engine speed control apparatus for an internal combustion engine which comprises: an air control valve which controls the cross-sectional area of a bypass passage provided so as to bypass the throttle value of the engine; a control unit which controls a degree of opening of said air control valve on the basis of a synthesized quantity which is obtained by synthesizing a basic air quantity for maintaining a target engine speed and an engine speed feed-back correction quantity which effects to eliminate an error between the target speed and an actual engine speed; an atmospheric pressure detecting means to detect an atmospheric pressure, and a correction means for correcting said synthesized quantity based upon the detected atmospheric pressure every time the engine is started and only during an engine starting operation.
Claim 3
Dependent Claim
36 words
The engine speed control apparatus according to claim 1, wherein an engine-stop flag is set before an atmospheric-pressure-corrected air quantity is calculated on the basis of the atmospheric pressure detected by the atmospheric pressure detecting means.
Claim 4
Dependent Claim
37 words
The engine speed control apparatus of claim 2, wherein said engine speed feed-back correction quantity is set to equal an initial engine speed feed-back correction quantity plus said atmospheric-pressure-corrective air quantity when said engine-stop flag is set.
Claim 5
Dependent Claim
30 words
The engine speed control apparatus of claim 1, wherein said controller calculates a duty ratio from said synthesized quantity and uses said duty ratio to control the air control valve.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-12 | 1995-11-11 | 1996-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-12 | 1999-11-11 | 2000-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-12 | 2003-11-11 | 2004-05-12 | $7700.00 | Window Closed / Lapsed |