Patent US4571992A successfully refreshed from Google Patents.
US4571992A
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US
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Method of determination of supply start in injection pumps
Assignee: Robert Bosch GmbH
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Filing: 1981-10-28
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Granted: 1986-02-25
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Expires: 2001-10-28
Abstract
Abstract A method of determination of a supply start in an injection pump, includes the steps of blocking an outlet of a pump element, for example, by a valve, supplying a testing medium into the pump element, and determining a supply start upon a pressure increase in the pump element when an upper edge of a pump piston closes a fuel inlet opening of the pump element.
Inventors
- 👤 Ulrich Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:22
CPC Classifications
F; F02; F02M; F02M65/00; F02M65/003
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A method of determination of a supply start in an injection pump, particularly Diesel injection pump, comprising the steps of blocking an outlet of a pump element; supplying a testing volume into the pump element; and determining a supply start upon a pressure increase in the pump element when an upper edge of a pump piston closes a fuel inlet opening of the pump element.
Claim 2
Independent Claim
65 words
A method of determination of a supply start in an injection pump, particularly Diesel injection pump, comprising the steps of blocking an outlet of a pump element; supplying a testing volume into the pump element; and determining a supply start upon a pressure increase in the pump element when an upper edge of a pump piston closes a fuel inlet opening of the pump element.
Claim 3
Dependent Claim
22 words
A method as defined in claim 1, wherein said blocking step includes blocking the outlet of the pump element by a valve.
Claim 4
Dependent Claim
24 words
A method as defined in claim 1, wherein said determining step includes determining the pressure increase by a pressure sensor arranged in the outlet.
Claim 5
Dependent Claim
41 words
A method as defined in claim 1, wherein said determining step includes converting the determined pressure by an evaluating electronic device into a trigger signal so as to determine thereby an angular position of a cam shaft for the pump piston.
Claim 6
Dependent Claim
20 words
A method as defined in claim 1, wherein said supplying step includes supplying a testing medium by a hydraulic aggregate.
Claim 7
Dependent Claim
20 words
A method as defined in claim 1, wherein said supplying step includes supplying a fuel replacement as the testing medium.
Claim 8
Dependent Claim
29 words
A method as defined in claim 1; and further comprising the step of retaining the rotary speed of a cam shaft for the pump piston at a lower level.
Claim 9
Dependent Claim
26 words
A method as defined in claim 7, wherein said retaining step includes retaining the rotary speed of the cam shaft lower than 20 revolutions per minute.
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) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |