US4877003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
RPM control device for internal combustion engine
Assignee: Mitsubishi Electric Corp
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Filing: 1987-11-24
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Granted: 1989-10-31
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Expires: 2007-11-24
Abstract
Abstract In an rpm control device for an internal combustion engine, a loop for adjusting a suction rate of the engine to a target value and a loop for adjusting a speed (rpm) of the engine to a target value are operated in combination, so that the suction rate and the engine speed are adjusted quickly.
Inventors
- 👤 Setsuhiro Shimomura
- 👤 Yukinobu Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:24
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/14; F02D31/00; F02D31/001; F02D31/002; F02D31/003; F02D31/005; F02D11/00; F02D11/06; F02D11/10; F02D2011/101; F02D2011/102
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
An rpm control device for an internal combustion engine comprising: speed adjusting means for providing a target suction rate of said engine according to a speed of said engine and a target speed of said engine; a suction rate sensor arranged in a suction path of said engine, for providing an electrical output corresponding to a suction rate of said engine; suction adjusting means for providing an adjusting signal according to a value which is obtained by integrating the difference between an output of said suction rate sensor and said target suction rate; control valve means for changing a suction rate of said engine substantially in proportion to said adjusting signal; driver means for driving said control valve means according to said adjusting signal; and abnormal speed detecting means for resetting said value obtained through integration to a reference value when the speed of said engine is abnormally decreased.
Claim 2
Dependent Claim
149 words
An rpm control device for an internal combustion engine comprising: speed adjusting means for providing a target suction rate of said engine according to a speed of said engine and a target speed of said engine; a suction rate sensor arranged in a suction path of said engine, for providing an electrical output corresponding to a suction rate of said engine; suction adjusting means for providing an adjusting signal according to a value which is obtained by integrating the difference between an output of said suction rate sensor and said target suction rate; control valve means for changing a suction rate of said engine substantially in proportion to said adjusting signal; driver means for driving said control valve means according to said adjusting signal; and abnormal speed detecting means for resetting said value obtained through integration to a reference value when the speed of said engine is abnormally decreased.
Claim 3
Dependent Claim
20 words
An rpm control device as claimed in claim 1, further comprising revolution sensor for detecting the speed of said engine.
Claim 4
Dependent Claim
20 words
An rpm control device as claimed in claim 1, further comprising a target speed generator for provide said target speed.
Claim 5
Dependent Claim
23 words
An rpm control device as claimed in claim 1, in which said suction rate sensor comprises a hot wire type suction rate sensor.
Claim 6
Dependent Claim
22 words
An rpm control device as claimed in claim 1, in which said suction rate sensor comprises a vane type suction rate sensor.
Claim 7
Dependent Claim
23 words
An rpm control device as claimed in claim 1, in which said suction rate sensor comprises a Karman's vortex type suction rate sensor.
Claim 8
Dependent Claim
24 words
An rpm control device as claimed in claim 1, in which said suction rate sensor comprises a pressure sensor provided in the suction path.
Claim 9
Dependent Claim
19 words
An rpm control device as claimed in claim 1, in which said control valve means comprises a solenoid valve.
Claim 10
Dependent Claim
22 words
An rpm control device as claimed in claim 1, in which said control valve means comprises a valve operated by a step-motor.
Claim 11
Dependent Claim
23 words
An rpm control device as claimed in claim 1, in which said control valve means comprises a valve operated by a DC motor.
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) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |