Patent US4966112A successfully refreshed from Google Patents.
US4966112A
Expired / Lapsed
US
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Method for adjusting idling RPM of engine
Assignee: Mitsubishi Electric Corp
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Filing: 1989-09-01
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Granted: 1990-10-30
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Expires: 2009-09-01
Abstract
Abstract A method for adjusting idling RPM of engine having a pair of bypass passages, one of which is provided with a control valve and the other is provided with an air intake adjusting screw. The control valve is controlled by an adjusting signal (St+Sc) which is derived from an adjusting signal generator provided in a feedback system for decreasing the deviation of idling RPM of engine from a predetermined target RPM value after detecting it and the air intake adjusting screw is so adjusted as to make the adjusting signal to conform to the predetermined value (St) by decreasing the RPM correcting signal (Sc) independently of the said control value. With this arrangement there are no need of particular ways or arrangements for adjusting the idling RPM of the engine.
Inventors
- 👤 Setsuhiro Shimomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:49
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/16; F02M; F02M3/00; F02M3/06; F02M3/07; F02D31/00; F02D31/001; F02D31/002; F02D31/003; F02D31/005
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
162 words
A method of adjusting an idling speed of an internal combustion engine having an intake passage, a throttle valve in the intake passage, first and second bypass passages each separately communicating with the intake passage so as to bypass the throttle valve, a flow rate control means for controlling the flow rate through the first bypass passage, and an adjustable device for adjusting the flow rate through the second bypass passage, the method comprising the steps of: generating, as a varying adjustment signal, a target signal and a correctional signal, the target signal representing a target engine idling speed, and the correction signal representing a difference between a detected engine idling speed and the target engine idling speed; controlling said flow rate control means in accordance with the generated varying adjustment signal; and adjusting said adjustable device so as to decrease an absolute value of said correction signal, said adjusting step being performed at a time when said controlling step is performed.
Claim 2
Independent Claim
162 words
A method of adjusting an idling speed of an internal combustion engine having an intake passage, a throttle valve in the intake passage, first and second bypass passages each separately communicating with the intake passage so as to bypass the throttle valve, a flow rate control means for controlling the flow rate through the first bypass passage, and an adjustable device for adjusting the flow rate through the second bypass passage, the method comprising the steps of: generating, as a varying adjustment signal, a target signal and a correctional signal, the target signal representing a target engine idling speed, and the correction signal representing a difference between a detected engine idling speed and the target engine idling speed; controlling said flow rate control means in accordance with the generated varying adjustment signal; and adjusting said adjustable device so as to decrease an absolute value of said correction signal, said adjusting step being performed at a time when said controlling step is performed.
Claim 3
Dependent Claim
16 words
The method as defined in claim 1, further comprising the step of monitoring said adjustment signal.
Claim 4
Dependent Claim
21 words
The method as defined in claim 1, further comprising the step of monitoring only the correction signal of said adjustment signal.
Claim 5
Dependent Claim
39 words
The method as defined in claim 1, further comprising the steps of: detecting at least one of losses and temperatures at predetermined engine elements; and generating said target engine idling speed in accordance with said detected losses and temperatures.
Claim 6
Dependent Claim
28 words
The method as defined in claim 1, further comprising the step of limiting a value of said generated varying adjustment signal to within a predetermined range of values.
Claim 7
Dependent Claim
29 words
The method as defined in claim 1, wherein said controlling step controls the amount of air intake to the engine through the first bypass passage in a linear fashion.
Claim 8
Dependent Claim
22 words
The method as defined in claim 1, further comprising the step of providing an analog representation of the generated varying adjustment signal.
Claim 9
Dependent Claim
21 words
The method as defined in claim 1, further comprising the step of providing a digital representation of the generated varying signal.
Claim 10
Dependent Claim
38 words
The method as defined in claim 1, wherein said controlling step comprises the steps of: generating a driving signal in accordance with the generated adjustment signal; and applying said generated driving signal to said flow rate control means.
Claim 11
Dependent Claim
17 words
The method as defined in claim 9, further comprising the step of monitoring said generated driving signal.
Claim 12
Dependent Claim
16 words
The method as defined in claim 1, further comprising the step of displaying the correction signal.
Claim 13
Dependent Claim
20 words
The method as defined in claim 1, further comprising the step of converting said correction signal into a duty signal.
Claim 14
Dependent Claim
39 words
The method as defined in claim 12, wherein the internal combustion engine includes a meter for measuring the duty signal, and wherein the adjusting step includes adjusting said adjustable device so that the meter measures a 50% duty signal.
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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) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |