US5280772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for controlling the speed of an internal combustion engine after starting
Assignee: Siemens AG
•
Filing: 1991-06-11
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Granted: 1994-01-25
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Expires: 2011-06-11
Abstract
Abstract In a process for controlling the speed of an internal combustion engine after starting, the ignition angle (ZW) is adjusted in the retarded direction when an engine speed threshold (nS) is reached, in order to reduce the power and to reach the idling speed (nLL) without overshooting. The engine speed threshold (nS) is dependent on the temperature-dependent idling speed (nLL). The degree of ignition angle adjustment (Z) is dependent on the rate of variation of the engine speed.
Inventors
- 👤 Gerald Weber
- 👤 Stefan Krebs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:39
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/1502; F02P5/1504; F02P5/1506; F02P5/1508; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
A process for controlling the speed of an internal combustion engine after starting until reaching an idling speed the speed of the internal combustion engine being continuously detected, and the idling speed being dependent on the temperature of cooling water in the engine, comprising the steps of: detecting, during an after-start phase, that the speed of the internal combustion engine has exceeded a specific engine speed threshold, adjusting the ignition angle in a retarded direction as a function of a rate of variation of the speed for a specific time period, and after this time period has elapsed adjusting the ignition angle back to a normal ignition angle in accordance with a predetermined function.
Claim 2
Dependent Claim
114 words
A process for controlling the speed of an internal combustion engine after starting until reaching an idling speed the speed of the internal combustion engine being continuously detected, and the idling speed being dependent on the temperature of cooling water in the engine, comprising the steps of: detecting, during an after-start phase, that the speed of the internal combustion engine has exceeded a specific engine speed threshold, adjusting the ignition angle in a retarded direction as a function of a rate of variation of the speed for a specific time period, and after this time period has elapsed adjusting the ignition angle back to a normal ignition angle in accordance with a predetermined function.
Claim 3
Dependent Claim
25 words
The process as claimed in claim 1, wherein an idling speed control is provided which adjusts the speed of the engine to the idling speed.
Claim 4
Dependent Claim
18 words
The process as claimed in claim 2, wherein the engine speed threshold is dependent on the idling speed.
Claim 5
Dependent Claim
22 words
The process as claimed in claim 2, wherein the adjusting of the ignition angle back to the normal ignition angle is linear.
Claim 6
Dependent Claim
22 words
The process as claimed in claim 2, wherein the adjusting of the ignition angle back to the normal ignition angle is progressive.
Claim 7
Dependent Claim
30 words
The process as claimed in claim 1, wherein a still existing adjustment in the retarded direction of the ignition angle is reversed if the idling operating state is departed from.
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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) | 1997-01-24 | 1997-07-26 | 1998-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-24 | 2001-07-26 | 2002-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-24 | 2005-07-26 | 2006-01-25 | $7700.00 | Window Closed / Lapsed |