US5207089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for measuring the control cross section area of a nozzle
Assignee: Robert Bosch GmbH
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Filing: 1989-11-23
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Granted: 1993-05-04
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Expires: 2009-11-23
Abstract
Abstract The method for measuring the cross-sectional area of a nozzle by a pneumatic through-flow method with supercritical pressure ratio measures the volume flow flowing through the nozzle on its input side by a differential pressure measurement at a resistance distance through which a laminar flow passes. Deviations of the temperature of the test medium from a reference value are determined by a temperature sensor and accounted for via a correction factor.
Inventors
- 👤 Jurgen Abt
- 👤 Sybille Stumpf
- 👤 Ulrich Kuhn
- 👤 Werner Banzhaf
- 👤 Gerhard Felten
- 👤 Gerold Lemperle
- 👤 Michael Specker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:29
CPC Classifications
G; G01; G01B; G01B13/00; G01B13/08; G01B13/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
101 words
A method for measuring a control cross-section area of a nozzle, comprising the steps of providing a pneumatic through-flow of a medium through a nozzle with supercritical pressure ratio of pressures in back and in front of the nozzle; measuring the flow passing through the nozzle as a volume flow (V E ) on an input side of the nozzle; and determining a control cross-section area of the nozzle as follows: A=K'·V.sub.E (1-0.0017(δ.sub.E -20° C.)) wherein K' is a constant variable for the medium and δ E is the temperature (in °Celsius) of the test medium in front of the nozzle.
Claim 2
Independent Claim
101 words
A method for measuring a control cross-section area of a nozzle, comprising the steps of providing a pneumatic through-flow of a medium through a nozzle with supercritical pressure ratio of pressures in back and in front of the nozzle; measuring the flow passing through the nozzle as a volume flow (V E ) on an input side of the nozzle; and determining a control cross-section area of the nozzle as follows: A=K'·V.sub.E (1-0.0017(δ.sub.E -20° C.)) wherein K' is a constant variable for the medium and δ E is the temperature (in °Celsius) of the test medium in front of the nozzle.
Claim 3
Dependent Claim
42 words
A method as defined in claim 1, wherein said measuring the flow includes determining the volume flow by a differential pressure measurement at a resistance distance through which the flow passes in a laminar fashion on the input side of a nozzle.
Claim 4
Dependent Claim
16 words
A method as defined in claim 2, wherein said resistance distance includes at least one tube.
Claim 5
Dependent Claim
19 words
A method as defined in claim 2, wherein said resistance distance includes a plurality of tubes connected in parallel.
Claim 6
Dependent Claim
22 words
A method as defined in claim 1; and further comprising applying a vacuum to provide the pneumatic through flow of the medium.
Claim 7
Dependent Claim
18 words
A method as defined in claim 5, wherein said vacuum is applied by means of a vacuum pump.
Claim 8
Dependent Claim
24 words
A method as defined in claim 1; and further comprising the step of applying an overpressure to provide said pneumatic through-flow of the medium.
Claim 9
Dependent Claim
35 words
A method as defined in claim 1; and further comprising the step of detecting deviations of a temperature of the medium from a reference temperature, and taking the deviations into consideration as a correction factor.
Claim 10
Dependent Claim
20 words
A method as defined in claim 8, wherein said detecting of the variations is performed by means of temperature sensor.
Claim 11
Dependent Claim
72 words
A method as defined in claim 1; and further comprising determining the volume flow by a differential pressure measurement at a resistance distance through which a laminar flow passes to the nozzle; detecting deviations of a temperature of a medium from a reference temperature and taking it into consideration as a correction factor; determining measurement variables of the pressure and the temperature; and processing the measurement variables in a computer-controlled test device.
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) | 1996-05-03 | 1996-11-02 | 1997-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-03 | 2000-11-02 | 2001-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-03 | 2004-11-02 | 2005-05-04 | $7700.00 | Window Closed / Lapsed |