Patent US4594974A successfully refreshed from Google Patents.
US4594974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching arrangement for glow plugs of a diesel internal combustion engine
Assignee: Bayerische Motoren Werke AG
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Filing: 1985-05-15
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Granted: 1986-06-17
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Expires: 2005-05-15
Abstract
Abstract So-called quick-start glow plugs which, at normal operating voltage, are continuously connected to the operating voltage, are to be operable also at higher operating voltages. In order to protect the glow plugs from being destroyed, a timing device for the intermittent activation of the glow plug becomes effective, this timing device being actuated by an operating voltage monitoring device.
Inventors
- 👤 Dieter Nowak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:03
CPC Classifications
F; F02; F02P; F02P19/00; F02P19/02; F02P19/021; F02P19/022; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
A switching arrangement for glow plugs of a diesel internal combustion engine, the glow plugs being activatable at normal operating voltage for a relatively short period of time and in an uninterrupted fashion, comprising means for monitoring operating voltage and timing means activated in a series of cycles by the monitoring means for the intermittent actuation of the glow plugs at an operating voltage higher than the normal value, a self-holding means for keeping the timing means activated during the entire preheating step, independently of a short-time drop of the operating voltage, wherein said means for monitoring operating voltage comprises means for producing a delayed input to activate said timing means in response to receipt by said means for monitoring operating voltage of an operating voltage higher than normal.
Claim 2
Dependent Claim
129 words
A switching arrangement for glow plugs of a diesel internal combustion engine, the glow plugs being activatable at normal operating voltage for a relatively short period of time and in an uninterrupted fashion, comprising means for monitoring operating voltage and timing means activated in a series of cycles by the monitoring means for the intermittent actuation of the glow plugs at an operating voltage higher than the normal value, a self-holding means for keeping the timing means activated during the entire preheating step, independently of a short-time drop of the operating voltage, wherein said means for monitoring operating voltage comprises means for producing a delayed input to activate said timing means in response to receipt by said means for monitoring operating voltage of an operating voltage higher than normal.
Claim 3
Dependent Claim
28 words
A switching arrangement according to claim 1, further comprising means for controlling the activating period of the timing means for each cycle in response to the operating voltage.
Claim 4
Dependent Claim
53 words
A switching arrangement for glow plugs in accordance with claim 1 wherein said timing means further comprises means for controlling the pulse-interval ratio of the timing cycles of the timing means set by the operating voltage to cause heating of the glow plugs to approximately the same temperature independently of actual operating voltage.
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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) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |