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US4284048A
Expired / Lapsed
US
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Pressure control valve for a fuel injection system
Assignee: Robert Bosch GmbH
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Filing: 1979-07-05
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Granted: 1981-08-18
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Expires: 1999-07-05
Abstract
Abstract A pressure control valve for a fuel injection system is proposed which serves to control the warm-up fuel quantity for a mixture-compressing, externally ignited internal combustion engine. The pressure control valve includes a movable valve part which is urged in the closing direction by a compression spring which is counteracted during the warm-up phase by a first temperature-dependent element, whose force on the compression spring below a predetermined temperature in the direction of an increase in the force of the first temperature-dependent element can be influenced by a second temperature-dependent element, so that the fuel-air mixture during the warm-up phase can be adapted to the requirements of every internal combustion engine.
Inventors
- 👤 Peter Schelhas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:23
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/30; F02M69/36; F02M69/38; F02M69/386
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
216 words
A pressure control valve for a fuel injection system of a mixture-compressing, externally ignited internal combustion engine having an intake manifold provided with an air flow rate member which is moved in accordance with the quantity of air flowing therethrough against a restoring force generated by a constant pressure fluid which is arbitrarily variable by means of said pressure control valve having a movable element, said pressure being supplied into a control pressure line against a face of said movable element, said movable element having another face acted upon by action of a compression spring, the force of said compression spring being arranged to be reduced by at least a first temperature-dependent element, said pressure control valve further including a second temperature-dependent element which may influence the force of the first temperature-dependent element on the compression spring, further wherein a rigid connecting element is disposed between said first and second temperature-dependent elements, said rigid connecting element being affixed at one end to at least one of said temperature-dependent elements, whereby said rigid connecting element provided between said first and second temperature-dependent elements engages said first temperature-dependent element and urges said first temperature-dependent element in the direction of an increase in the force of said first temperature-dependent element on said compression spring only below a predetermined temperature.
Claim 2
Dependent Claim
216 words
A pressure control valve for a fuel injection system of a mixture-compressing, externally ignited internal combustion engine having an intake manifold provided with an air flow rate member which is moved in accordance with the quantity of air flowing therethrough against a restoring force generated by a constant pressure fluid which is arbitrarily variable by means of said pressure control valve having a movable element, said pressure being supplied into a control pressure line against a face of said movable element, said movable element having another face acted upon by action of a compression spring, the force of said compression spring being arranged to be reduced by at least a first temperature-dependent element, said pressure control valve further including a second temperature-dependent element which may influence the force of the first temperature-dependent element on the compression spring, further wherein a rigid connecting element is disposed between said first and second temperature-dependent elements, said rigid connecting element being affixed at one end to at least one of said temperature-dependent elements, whereby said rigid connecting element provided between said first and second temperature-dependent elements engages said first temperature-dependent element and urges said first temperature-dependent element in the direction of an increase in the force of said first temperature-dependent element on said compression spring only below a predetermined temperature.
Claim 3
Dependent Claim
44 words
A pressure control valve in accordance with claim 1, further wherein an electrical heating element is disposed at least on said first temperature-dependent element, the electrical circuit of which is closed by means of an ignition and starting switch of the internal combustion engine.
Claim 4
Dependent Claim
20 words
A pressure control valve in accordance with claim 2, further wherein said first and second temperature-dependent elements comprise bimetallic springs.
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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |