US3587540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rpm regulating system for internal combustion engines operating on injected fuel
Assignee: Robert Bosch GmbH
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Filing: 1969-07-23
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Granted: 1971-06-28
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Expires: 1989-07-23
Abstract
Abstract AN R.P.M. REGULATING SYSTEM THAT INCLUDES A HYDRAULIC MOTOR ADAPTED TO DISPLACE THE FUEL QUANTITY CONTROL MEMBER OF A FUEL INJECTION PUMP DELIVERING FUEL TO AN INTERNAL COMBUSTION ENGINE, A SOLENOID VALVE THAT CONTROLS THE ADMISSION OF HYDRAULIC FLUID TO, AND ITS DRAINAGE FROM, SAID MOTOR AND AN ELECTRONIC CONTROL STAGE THE ENERGIZING OUTPUT SIGNAL OF WHICH, APPLIED TO SAID SOLENOID VALVE, IS GENERATED BY THE COMPARISON OF AN R.P.M. DEPENDENT ELECTRIC SIGNAL AND A SIGNAL RESPONSIVE TO THE POSITION OF SAID FUEL QUANTITY CONTROL MEMBER WITH A SIGNAL RESPONSIVE TO THE ARBITRARILY SET VALUE OF A DESIRED ENGINE OUTPUT.
Inventors
- 👤 Eberhard Hofmann
- 👤 Rolf Muller
- 👤 Heinrich Staudt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:22
CPC Classifications
F; F02; F02D; F02D1/00; F02D1/02; F02D1/08; F02D1/12; F02M; F02M51/00; F02M51/005; F02M59/00; F02M59/44
Claims Analysis
Total Claims: 0
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |