Patent US3780587A successfully refreshed from Google Patents.
US3780587A
Expired / Lapsed
US
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Methods of measuring instantaneous mean pressures in fluid media
Assignee: Automobiles Peugeot SA
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Filing: 1972-03-10
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Granted: 1973-12-25
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Expires: 1992-03-10
Abstract
Abstract Apparatus for measuring a pressure, applicable notably to the specific case of a fluid volume output in a conduit, in which a pressure pick up having a very short response time translates the instantaneous pressure into the form of an electric signal amplified and transformed into a voltage fed to an electric integrator determining the means pressure. At least one pick up emits an electric signal during at least one fraction of the period for controlling the release of the integrator, its integration period and the resetting thereof. The apparatus is applicable inter alia to systems for injecting fuel into internal combustion engines.
Inventors
- 👤 J Rivere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:46
CPC Classifications
G; G01; G01L; G01L23/00; G01L23/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
251 words
Apparatus for measuring mean pressure of a fluid medium in which pulsated waves are produced comprising: a. means for detecting the instantaneous fluid medium pressure and forming voltage signals proportional to said pressure; b. an electronic integrator, responsive to said voltage signals, for determining signals corresponding to the mean pressure of said fluid medium, said integrator including an operational amplifier, a first field effect transistor connected between said detecting means and said amplifier, a first capacitive memory connected to an input of said amplifier and being charged through said first transistor, a second field effect transistor connected on either side of said first memory, a third field effect transistor connected to the output of said amplifier, a second capacitive buffer memory being charged through said third field effect transistor, and a fourth field effect transistor connected across the terminals of said second memory; and c. means for controlling the operation of said integrator including means for periodically initiating the integration operation, a first multivibrator, having an input connected to said initiating means and an output connected to said second transistor, an or-no gate having a first input connected to the output of said first multivibrator and an output connected to said first transistor, a second multivibrator having an input connected to said initiating means and an output connected to said third transistor and a second input of said gate, and a third multivibrator having an input connected to the output of said gate and an output connected to said fourth transistor.
Claim 2
Dependent Claim
251 words
Apparatus for measuring mean pressure of a fluid medium in which pulsated waves are produced comprising: a. means for detecting the instantaneous fluid medium pressure and forming voltage signals proportional to said pressure; b. an electronic integrator, responsive to said voltage signals, for determining signals corresponding to the mean pressure of said fluid medium, said integrator including an operational amplifier, a first field effect transistor connected between said detecting means and said amplifier, a first capacitive memory connected to an input of said amplifier and being charged through said first transistor, a second field effect transistor connected on either side of said first memory, a third field effect transistor connected to the output of said amplifier, a second capacitive buffer memory being charged through said third field effect transistor, and a fourth field effect transistor connected across the terminals of said second memory; and c. means for controlling the operation of said integrator including means for periodically initiating the integration operation, a first multivibrator, having an input connected to said initiating means and an output connected to said second transistor, an or-no gate having a first input connected to the output of said first multivibrator and an output connected to said first transistor, a second multivibrator having an input connected to said initiating means and an output connected to said third transistor and a second input of said gate, and a third multivibrator having an input connected to the output of said gate and an output connected to said fourth transistor.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 wherein said means for detecting comprises a quartz pick-up and a voltage amplifier connected to said pick-up.
Claim 4
Dependent Claim
23 words
The apparatus of claim 1 wherein said means for detecting comprises a strain gauge pick-up and a current-voltage converter connected to said pick-up.
Claim 5
Dependent Claim
21 words
The apparatus of claim 1 wherein said means for initiating comprises an electromagnetic proximity pick-up spaced apart from the fluid medium.
Claim 6
Dependent Claim
21 words
The apparatus of claim 1 wherein said means for initiating comprises an electrostatic proximity pick-up spaced apart from the fluid medium.
Claim 7
Dependent Claim
88 words
The apparatus of claim 1 wherein during a first period said gate triggers said first transistor to charge said first memory, said third multivibrator triggers said fourth transistor during said first period to reset said second memory, said first and second multivibrator trigger said second and third transistors, respectively, during a second period to transfer energy stored in said first memory to said second memory, said first memory being reset prior to being charged, said second memory being discharged prior to receiving energy transferred from said first memory.
Claim 8
Dependent Claim
31 words
The apparatus of claim 6 wherein the energy transferred to said second memory is stored therein during a time period corresponding substantially to the period said first memory is being charged.
Claim 9
Dependent Claim
23 words
The apparatus of claim 6 wherein the energy stored in said second memory is discharged to a digital computer via an analog-to-digital converter.
Claim 10
Dependent Claim
26 words
The apparatus of claim 6 wherein said energy stored in said second memory is discharged to different points of an automatic computer through a synchronizing system.
Claim 11
Dependent Claim
63 words
The apparatus of claim 1 further comprising an internal combustion engine having an induction pipe, said means for determining including a pressure pick-up disposed on said induction pipe wherein the amount of air necessary for filling the cylinders of the engine is taken as a mean absolute pressure in said pipe and the mean pressure is measured during transitory acceleration and deceleration phases.
Claim 12
Dependent Claim
23 words
The apparatus of claim 10 wherein said internal combustion engine comprises a crankshaft and the periodic initiation occurs every half-revolution of the crankshaft.
Claim 13
Dependent Claim
26 words
The apparatus of claim 10 Wherein said internal combustion engine comprises a crankshaft and the period initiation occurs at multiples of a half-revolution of the crankshaft.
References Cited (Backward Citations)
US3625054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |