US4492204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metering device for an internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1982-08-25
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Granted: 1985-01-08
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Expires: 2002-08-25
Abstract
Abstract A fuel metering system and method for an internal combustion engine is proposed, having a lambda regulation device and a warm-up enrichment, in which at the onset of regulation the warm-up enrichment is reduced or turned off for the purpose of not having an abnormally high control stroke when transferring to a closed-loop operation and thereby rapidly attaining a stable lambda value.
Inventors
- 👤 Richard Bertsch
- 👤 Dieter Gunther
- 👤 Ulrich Steinbrenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:08
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1486; F02D41/1487
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A method for controlling fuel supply rate in a fuel metering system for an internal combustion engine having a closed-loop lambda regulating device and means providing a warm-up enrichment, comprising the steps of sensing the temperature of a lambda sensor of said lambda regulating device, switching from an open-loop regulation to closed-loop lambda regulation of fuel supply in response to said sensing step, reducing the amount of warm-up enrichment when said closed-loop regulation begins, switching from said closed-loop regulation to said open-loop regulation in response to sensing of a predetermined temperature range in said sensing step, and preventing the amount of warm-up enrichment from being increased following a return from closed-loop lambda regulation to open-loop regulation.
Claim 2
Independent Claim
116 words
A method for controlling fuel supply rate in a fuel metering system for an internal combustion engine having a closed-loop lambda regulating device and means providing a warm-up enrichment, comprising the steps of sensing the temperature of a lambda sensor of said lambda regulating device, switching from an open-loop regulation to closed-loop lambda regulation of fuel supply in response to said sensing step, reducing the amount of warm-up enrichment when said closed-loop regulation begins, switching from said closed-loop regulation to said open-loop regulation in response to sensing of a predetermined temperature range in said sensing step, and preventing the amount of warm-up enrichment from being increased following a return from closed-loop lambda regulation to open-loop regulation.
Claim 3
Dependent Claim
27 words
A method for a fuel metering system in accordance with claim 1, further comprising the step of, turning off the warm-up enrichment when said closed-loop regulation begins.
Claim 4
Dependent Claim
33 words
A method for a fuel metering system in accordance with claim 1, further comprising the step of, reducing the warm-up enrichment in accordance with a function of time when said closed-loop regulation begins.
Claim 5
Dependent Claim
32 words
A method for a fuel metering system having a post-start boost in accordance with claim 1 or 2, further comprising the step of, reducing the post-start boost when said closed-loop regulation begins.
Claim 6
Dependent Claim
119 words
A fuel metering control system for an internal combustion engine having a closed-loop lambda regulating means and means providing a warm-up enrichment, comprising a lambda sensor, a temperature sensing means connected to sense the temperature of said lambda sensor, switching means connected to said regulating means responsive to said temperature sensing means for initiating a closed-loop control of fuel metering by said lambda regulating means, reducing the amount of warm-up enrichment provided by said warm-up enrichment means at the onset of closed-loop regulation and terminating said closed-loop control of fuel metering based on the temperature sensed by said temperature sensing means, and means for preventing increasing of said amount of warm-up enrichment following said terminating of said closed-loop control.
Claim 7
Dependent Claim
119 words
A fuel metering control system for an internal combustion engine having a closed-loop lambda regulating means and means providing a warm-up enrichment, comprising a lambda sensor, a temperature sensing means connected to sense the temperature of said lambda sensor, switching means connected to said regulating means responsive to said temperature sensing means for initiating a closed-loop control of fuel metering by said lambda regulating means, reducing the amount of warm-up enrichment provided by said warm-up enrichment means at the onset of closed-loop regulation and terminating said closed-loop control of fuel metering based on the temperature sensed by said temperature sensing means, and means for preventing increasing of said amount of warm-up enrichment following said terminating of said closed-loop control.
Claim 8
Dependent Claim
25 words
A fuel metering system according to claim 5, further comprising a correction stage means feeding an electromagnetic injection valve means connected to said switching means.
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) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |