US4791810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow monitoring
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1987-04-17
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Granted: 1988-12-20
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Expires: 2007-04-17
Abstract
Abstract An apparatus and a method are provided for detecting and monitoring flow of a fluid through an injector, such as a fuel injector (10) of a diesel engine. Ultrasonic waves are detected by a transducer (12), and signals passed through a filter (20), so as to observe broadband signals of frequency above 100 kHz. Such signals are due to turbulent flow through the injector orifice (38), and so enable the flow itself to be detected.
Inventors
- 👤 Charles F. Old
- 👤 Christopher B. Scruby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:57
CPC Classifications
F; F02; F02M; F02M65/00; F02M65/001; F02M65/005; G; G01; G01F; G01F1/00; G01F1/66; G01F1/666; G01P; G01P13/00; G01P13/0006; G01P13/0073; F02B; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
An injector monitoring apparatus, including a broad-band ultrasonic transducer sensitive to ultrasonic waves of frequencies throughout the range 100 kHz to 1 MHz, means for acoustically coupling the transducer to an injector, means for amplifying noise signals from the transducer, for filtering out noise signals below a cut-off frequency of 100 kHz, and for generating an output signal representing the noise signals form the transducer throughout a board frequency band above the cut-off frequency, and means responsive to the output signal for indicating fluid flow through the injector.
Claim 2
Dependent Claim
88 words
An injector monitoring apparatus, including a broad-band ultrasonic transducer sensitive to ultrasonic waves of frequencies throughout the range 100 kHz to 1 MHz, means for acoustically coupling the transducer to an injector, means for amplifying noise signals from the transducer, for filtering out noise signals below a cut-off frequency of 100 kHz, and for generating an output signal representing the noise signals form the transducer throughout a board frequency band above the cut-off frequency, and means responsive to the output signal for indicating fluid flow through the injector.
Claim 3
Dependent Claim
44 words
An apparatus as claimed in claim 1 wherein the transducer is sensitive to ultrasonic waves of frequencies throughout the range 100 kHz to 2 MHz, and the output signal represents the noise signals throughout a frequency band from the cut-off frequency to 1 MHz.
Claim 4
Independent Claim
69 words
A method for monitoring the operation of an injector comprising detecting, by means of a broadband ultrasonic transducer sensitive to waves throughout the frequency range 100 kHz to 1 MHz, noise due to turbulent flow of fluid through the injector; filtering out noise signals below a cut-off frequency of 100 kHz; and genernating an output signal representing the noise signals throughout a broad frequency band above the cut-off frequency.
Claim 5
Independent Claim
69 words
A method for monitoring the operation of an injector comprising detecting, by means of a broadband ultrasonic transducer sensitive to waves throughout the frequency range 100 kHz to 1 MHz, noise due to turbulent flow of fluid through the injector; filtering out noise signals below a cut-off frequency of 100 kHz; and genernating an output signal representing the noise signals throughout a broad frequency band above the cut-off frequency.
References Cited (Backward Citations)
US3289077A
Cited
US3580092A
Cited
US3731527A
Cited
GB1372724A
Cited
US3821726A
Cited
US3816773A
Cited
US4052663A
Cited
US4109517A
Cited
GB2035560A
Cited
GB2089986A
Cited
JPS57188764A
Cited
JPS57200553A
Cited
EP0078987A2
Cited
US4523458A
Cited
GB2122252A
Cited
JPS5970879A
Cited
GB2146119A
Cited
US4577496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |