US4760341A
Expired / Lapsed
US
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Method and apparatus for monitoring operation of a spark ignition device in a gas turbine engine
Assignee: ZF International UK Ltd
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Filing: 1986-10-29
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Granted: 1988-07-26
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Expires: 2006-10-29
Abstract
Abstract The characteristics of an energizing voltage pulse and of the spark discharge in an ignition device for a gas turbine engine are monitored by providing a voltage whose magnitude and duration correspond to those of an electrical field in the ignition device. An output signal is provided only when the duration and magnitude of the energizing pulse are respectively not greater than and not less than predetermined values, and when the time integral over a preset period of spark discharges in the device is greater than a predetermined value.
Inventors
- 👤 Robert C. Skerritt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:11
CPC Classifications
F; F02; F02P; F02P15/00; F02P15/001; F02P15/003; F02C; F02C7/00; F02C7/26; F02C7/264; F02C7/266; F02P17/00; F02P17/12; F02P2017/006
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A method of monitoring operation of a spark ignition device in a gas turbine engine, comprising detecting the magnitude of an electric field in said device, generating a first indicating signal if the duration of an input voltage applied to said device does not exceed a predetermined value, generating a second indicating signal if the magnitude of said input voltage is not less than a predetermined value, and generating an output signal only in the presence of said first and second signals.
Claim 2
Independent Claim
82 words
A method of monitoring operation of a spark ignition device in a gas turbine engine, comprising detecting the magnitude of an electric field in said device, generating a first indicating signal if the duration of an input voltage applied to said device does not exceed a predetermined value, generating a second indicating signal if the magnitude of said input voltage is not less than a predetermined value, and generating an output signal only in the presence of said first and second signals.
Claim 3
Independent Claim
108 words
A method of monitoring operation of a spark ignition device in a gas turbine engine, comprising detecting the magnitude and duration of an electric field in said device, generating a first indicating signal if the duration of an input voltage applied to said device does not exceed a predetermined value, generating a second indicating signal if the magnitude of said input voltage is not less than a predetermined value, generating a third indicating signal if a time integral of a spark discharge in said device is greater than a predetermined value, and generating an output signal only in the presence of said first, second and third indicating signals.
Claim 4
Independent Claim
108 words
A method of monitoring operation of a spark ignition device in a gas turbine engine, comprising detecting the magnitude and duration of an electric field in said device, generating a first indicating signal if the duration of an input voltage applied to said device does not exceed a predetermined value, generating a second indicating signal if the magnitude of said input voltage is not less than a predetermined value, generating a third indicating signal if a time integral of a spark discharge in said device is greater than a predetermined value, and generating an output signal only in the presence of said first, second and third indicating signals.
Claim 5
Independent Claim
120 words
An apparatus for monitoring operation of a spark ignition device in a gas turbine engine, comprising means for detecting the magnitude and duration of an electric field in said device, means for generating a first indicating signal if the duration of an input voltage pulse applied to said device does not exceed a predetermined value, means for generating a second indicating signal if the magnitude of said input voltage pulse is not less than a predetermined value, means for generating a third indicating signal if a time integral of a spark discharge in said device is greater than a predetermined value, and means for generating an output signal only in the presence of said first, second and third indicating signals.
Claim 6
Independent Claim
120 words
An apparatus for monitoring operation of a spark ignition device in a gas turbine engine, comprising means for detecting the magnitude and duration of an electric field in said device, means for generating a first indicating signal if the duration of an input voltage pulse applied to said device does not exceed a predetermined value, means for generating a second indicating signal if the magnitude of said input voltage pulse is not less than a predetermined value, means for generating a third indicating signal if a time integral of a spark discharge in said device is greater than a predetermined value, and means for generating an output signal only in the presence of said first, second and third indicating signals.
Claim 7
Independent Claim
94 words
An apparatus for monitoring operation of a spark ignition device in a gas turbine engine, comprising means for detecting the magnitude and duration of an electric field in said device, means for generating a first indicating signal if the duration of an input voltage pulse applied to said device does not exceed a predetermined value, means for generating a second indicating signal if the magnitude of said input voltage pulse is not less than a predetermined value, and means for generating an output signal only in the presence of said first and second signal.
Claim 8
Independent Claim
94 words
An apparatus for monitoring operation of a spark ignition device in a gas turbine engine, comprising means for detecting the magnitude and duration of an electric field in said device, means for generating a first indicating signal if the duration of an input voltage pulse applied to said device does not exceed a predetermined value, means for generating a second indicating signal if the magnitude of said input voltage pulse is not less than a predetermined value, and means for generating an output signal only in the presence of said first and second signal.
Claim 9
Dependent Claim
36 words
An apparatus as claimed in claim 4 which includes means for generating a third indicating signal if a time integral of the voltage of a series of spark discharges in said device exceeds a predetermined value.
Claim 10
Dependent Claim
24 words
An apparatus as claimed in claim 4 in which said means for generating the first indicating signal is responsive to said second indicating signal.
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) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |