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US3887870A
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Pulse repetition rate meters
Assignee: Automobiles Citroen SA
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Filing: 1972-09-28
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Granted: 1975-06-03
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Expires: 1992-09-28
Abstract
Abstract A pulse repetition rate meter has a time base for generating a fixed plurality of auxiliary pulses in response to each pulse received of a train of pulses whose repetition rate is to be measured. A clock periodically provides a gating signal having a predetermined duration greater than the period between two successively occuring pulses in the train of pulses to be measured. A gated counter under the control of the gating signal counts all the auxiliary pulses from the time base that occur during the period of the gating signal. The count thus registered is a function of the pulse repetition rate.
Inventors
- 👤 Albert Grosseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:14
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/489; G01R; G01R23/00; G01R23/02; G01R23/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A pulse-repetition rate meter, comprising time base means having an input to receive pulses whose repetition rate is to be measured and an output, the time base means being operative upon receipt of each pulse at its input to generate a predetermined plurality of auxiliary pulses at a frequency such that the said plurality is completed before the next following pulse to be measured occurs, counting means having an input connected to the output of the time base means and a gate input, and control means for supplying a control signal to the gate input of the counting means to render the counting means operative to count said auxiliary pulses for a predetermined duration only, whereby the count registered by the counting means is representative of the repetition rate of the pulses applied to the input of the time base means.
Claim 2
Dependent Claim
141 words
A pulse-repetition rate meter, comprising time base means having an input to receive pulses whose repetition rate is to be measured and an output, the time base means being operative upon receipt of each pulse at its input to generate a predetermined plurality of auxiliary pulses at a frequency such that the said plurality is completed before the next following pulse to be measured occurs, counting means having an input connected to the output of the time base means and a gate input, and control means for supplying a control signal to the gate input of the counting means to render the counting means operative to count said auxiliary pulses for a predetermined duration only, whereby the count registered by the counting means is representative of the repetition rate of the pulses applied to the input of the time base means.
Claim 3
Dependent Claim
141 words
A pulse-repetition rate meter, comprising time base means having an input to receive pulses whose repetition rate is to be measured and an output, the time base means being operative upon receipt of each pulse at its input to generate a predetermined plurality of auxiliary pulses at a frequency such that the said plurality is completed before the next following pulse to be measured occurs, counting means having an input connected to the output of the time base means and a gate input, and control means for supplying a control signal to the gate input of the counting means to render the counting means operative to count said auxiliary pulses for a predetermined duration only, whereby the count registered by the counting means is representative of the repetition rate of the pulses applied to the input of the time base means.
Claim 4
Dependent Claim
141 words
A pulse-repetition rate meter, comprising time base means having an input to receive pulses whose repetition rate is to be measured and an output, the time base means being operative upon receipt of each pulse at its input to generate a predetermined plurality of auxiliary pulses at a frequency such that the said plurality is completed before the next following pulse to be measured occurs, counting means having an input connected to the output of the time base means and a gate input, and control means for supplying a control signal to the gate input of the counting means to render the counting means operative to count said auxiliary pulses for a predetermined duration only, whereby the count registered by the counting means is representative of the repetition rate of the pulses applied to the input of the time base means.
Claim 5
Dependent Claim
51 words
A meter according to claim 1 wherein the time base means comprises a generator triggered by each pulse to be measured to generate pulses at a predetermined frequency, and a counter for counting the generated pulses, the counter being operative to halt the generator when the count reaches said predetermined plurality.
Claim 6
Dependent Claim
72 words
A meter according to claim 1 wherein said control means comprises clock means having an input connected to receive the pulses applied to the input of the time base means, and having an output connected to the gate input of the counting means, the clock means being triggered by each pulse received to activate the counting means and operative to de-activate the counting means at the end of the sAid predetermined duration.
Claim 7
Dependent Claim
27 words
A meter according to claim 1, wherein the pulses whose repetition rate is to be measured are representative of the speed of the rotation of the shaft.
Claim 8
Dependent Claim
65 words
In combination, a four stroke spark ignition engine having means for generating ignition pulses, and a pulse repetition rate meter according to claim 1, the said means for generating ignition pulses being connected to feed the ignition pulses to the input of the time base means, said plurality of auxiliary pulses being 240/n in number, where n is a number of cylinders of the engine.
Claim 9
Dependent Claim
65 words
In combination, a two stroke spark ignition engine having means for generating ignition pulses, and a pulse repetition rate meter according to claim 1, the said means for generating ignition pulses being connected to feed the ignition pulses to the input of the time base means said plurality of auxiliary pulses being 120/n in number, where n is a number of cylinders of the engine.
References Cited (Backward Citations)
US3769583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |