US4045687A
Expired / Lapsed
US
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Circuit arrangement for evaluating the electrical output signals of a detector for thickness changes in a fuel injection line
Assignee: Siemens AG
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Filing: 1976-08-20
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Granted: 1977-08-30
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Expires: 1996-08-20
Abstract
Abstract A circuit arrangement for evaluating the electrical output signals of a detector for thickness changes in a fuel injection line under the influence of an injection process comprising a series circuit connected to output terminals of the detector and including a differential amplifier, an a-c voltage amplifier, a highpass filter and a rectifier with a peak value storage device and a Schmitt trigger each connected in parallel to the output of the rectifier, the output of the peak value storage device being connected as a reference input of the Schmitt trigger, and a one shot multivibrator connected to the output of the Schmitt trigger.
Inventors
- 👤 Albert Maringer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:42
CPC Classifications
F; F02; F02M; F02M65/00; F02M65/003; F02D; F02D41/00; F02D41/30; F02D41/3005; G; G01; G01L; G01L9/00; G01L9/08; F02D41/20; F02D2041/202; F02D2041/2055; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0602; F02D41/2096; F02M2200/00; F02M2200/21
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
Apparatus for evaluating the electrical output signals of a detector for thickness changes in a fuel injection line due to the influence of the injection process, such as the rapid pressure variations generated when an injection valve is closed, comprising: a. the series connection of an a-c voltage amplifier responsive to said detected signals at its input, a highpass filter and a rectifier responsive to said a-c voltage output; b. a peak value storage device having the output of said rectifier as its input; c. a Schmitt trigger, also having as its input the output of said rectifier, the output of said peak value storage device being connected as a reference input to the Schmitt trigger; and d. a one shot multivibrator connected to the output of said Schmitt trigger.
Claim 2
Dependent Claim
130 words
Apparatus for evaluating the electrical output signals of a detector for thickness changes in a fuel injection line due to the influence of the injection process, such as the rapid pressure variations generated when an injection valve is closed, comprising: a. the series connection of an a-c voltage amplifier responsive to said detected signals at its input, a highpass filter and a rectifier responsive to said a-c voltage output; b. a peak value storage device having the output of said rectifier as its input; c. a Schmitt trigger, also having as its input the output of said rectifier, the output of said peak value storage device being connected as a reference input to the Schmitt trigger; and d. a one shot multivibrator connected to the output of said Schmitt trigger.
Claim 3
Dependent Claim
20 words
Apparatus according to claim 1, and further including a differential amplifier coupled between the detector and said a-c voltage amplifier.
Claim 4
Dependent Claim
19 words
Apparatus according to claim 2, wherein said highpass filter has a lower cut off frequency of about 500 Hz.
Claim 5
Dependent Claim
19 words
Apparatus according to claim 1, wherein said highpass filter has a lower cut off frequency of about 500 Hz.
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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |