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US4569227A
Expired / Lapsed
US
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Test station for fuel injection pump
Assignee: Robert Bosch GmbH
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Filing: 1984-10-25
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Granted: 1986-02-11
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Expires: 2004-10-25
Abstract
Abstract A test station for fuel injection pump includes a test container enclosing an air space into which a fuel injection nozzle under test opens. A microphone communicates with the air space to convert air pressure pulses resulting during each injection into a corresponding electrical signal. The integral of the output signals from the microphone is a measure for the quantity of the injection fuel. The total quantity of injected fuel can be determined by a calibration system.
Inventors
- 👤 Dietrich Adolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:29
CPC Classifications
F; F02; F02M; F02M65/00; F02M65/002; B; B05; B05B; B05B1/00; B05B1/002; B05B12/00; B05B12/004; B05B12/006; B05B12/008; B05B12/08; B05B12/085; G; G01; G01F; G01F1/00; G01F1/66; G01F1/666; G01F25/00; G01F25/10; G01F25/17
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
65 words
A method of measuring the quantity of fuel injected by a nozzle of an injection pump, comprising the steps of injecting fuel through a nozzle under test into a closed air space and detecting the resulting pressure pulse by a microphone, and then integrating the output signals from the microphone and evaluating the integral signal as a measure of the quantity of the injected fuel.
Claim 2
Independent Claim
65 words
A method of measuring the quantity of fuel injected by a nozzle of an injection pump, comprising the steps of injecting fuel through a nozzle under test into a closed air space and detecting the resulting pressure pulse by a microphone, and then integrating the output signals from the microphone and evaluating the integral signal as a measure of the quantity of the injected fuel.
Claim 3
Dependent Claim
30 words
A method as defined in claim 1, wherein the air space is sealed by a body of liquid and held at a constant height by an overflow of the liquid.
Claim 4
Dependent Claim
16 words
A method as defined in claim 2, wherein an overpressure is created in the air space.
Claim 5
Independent Claim
107 words
A device for determining the quantity of fuel injected by a nozzle of an injection pump, comprising a container for enclosing an air space at its top part and a body of sealing liquid at its bottom part; means for mounting a nozzle to be tested at the top of the container so as to inject fuel delivered by an injection pump into the air space; a microphone communicating with the air space to convert air pressure pulses resulting during injection into corresponding electrical signals; and means for integrating the electrical signals into an integral signal which is the measure of the quantity of the injected fuel.
Claim 6
Independent Claim
107 words
A device for determining the quantity of fuel injected by a nozzle of an injection pump, comprising a container for enclosing an air space at its top part and a body of sealing liquid at its bottom part; means for mounting a nozzle to be tested at the top of the container so as to inject fuel delivered by an injection pump into the air space; a microphone communicating with the air space to convert air pressure pulses resulting during injection into corresponding electrical signals; and means for integrating the electrical signals into an integral signal which is the measure of the quantity of the injected fuel.
Claim 7
Dependent Claim
24 words
A device as defined in claim 4, wherein the bottom part of the container is provided with an overflow device for the liquid body.
Claim 8
Dependent Claim
26 words
A device as defined in claim 5, further comprising a calibrating device connected to an output of the overflow device and including a reference volume chamber.
Claim 9
Dependent Claim
25 words
A device as defined in claim 6, wherein the integrated signal from the integrating means is corrected by a signal derived from the calibrating device.
Claim 10
Dependent Claim
55 words
A device as defined in claim 5, comprising a pressure regulator installed in said overflow device to generate an overpressure in the air space of the container, said microphone having a diaphragm communicating with the air space in the container and the rear side of the diaphragm communicating with the air space via a throttle.
Claim 11
Dependent Claim
16 words
A device as defined in claim 13, wherein the microphone is enclosed in a pressure chamber.
Claim 12
Dependent Claim
22 words
A device as defined in claim 4, wherein the microphone communicates with the air space in the container via a pressure pipe.
Claim 13
Dependent Claim
26 words
8. A device as defined in claim 4, wherein the top of the container includes mounting means for receiving a plurality of nozzles to be tested.
Claim 14
Dependent Claim
28 words
A device as defined in claim 11, further comprising means for coordinating respective nozzles with the integrating means in response to an angular position of the injection pump.
Claim 15
Dependent Claim
25 words
A device as defined in claim 12, wherein the integrating means includes a multiposition switching device having a plurality of contacts assigned to respective nozzles.
Claim 16
Dependent Claim
33 words
A device as defined in claim 4, further comprising a temperature sensor arranged in the air space, and means for correcting the integrating signal in dependency on the signal from the temperature sensor.
References Cited (Backward Citations)
US3958458A
Cited
US4347747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |