US3610212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative pressure detector in internal combustion engine
Assignee: Denso Corp
•
Filing: 1969-05-01
•
Granted: 1971-10-05
•
Expires: 1989-05-01
Abstract
Abstract Negative pressure detector in an internal combustion engine in which a detecting section for the negative pressure is formed of an oscillation coil converting the negative pressure into a variation in inductance and an oscillator detecting the variation in inductance of the oscillation coil as a variation in frequency, said detecting section for the negative pressure is arranged in the vicinity of an inlet manifold and consequently the negative pressure in the engine can be detected exactly with a good signal to noise ratio S/N.
Inventors
- 👤 Kunio Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:42
CPC Classifications
G; G01; G01L; G01L23/00; G01L23/08; G01L23/12; G01L9/00; G01L9/0041; G01L9/007; G01L9/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
216 words
An apparatus for an internal combustion engine for converting variations in negative pressure in an engine into variations in inductance of an oscillation coil, and for generating an electrical signal for controlling the fuel injection valve in said engine comprising: an oscillator, having an output terminal and power supply terminal and including said oscillation coil, for generating an output signal to be applied to an amplifying circuit connected to said output terminal so that the frequency of said output signal varies in accordance with said variations in inductance of said oscillation coil, an amplifying circuit, having an input terminal for receiving said output signal and a power supply terminal, for producing said electrical signal, said electrical signal varying as a function of variations in the frequency of said oscillator output signal, connecting means connecting said oscillator to said amplifying circuit comprising an input coupling condenser, a connecting wire, and an output coupling condenser connected in series between said output terminal of said oscillator and said input terminal of said amplifying circuit, and high impedance coil means comprising first and second coils, said first coil being connected between said power supply terminal of said oscillator and said connecting wire, and said second coil being connected between said power terminal of said amplifying circuit and said connecting wire.
Claim 2
Independent Claim
216 words
An apparatus for an internal combustion engine for converting variations in negative pressure in an engine into variations in inductance of an oscillation coil, and for generating an electrical signal for controlling the fuel injection valve in said engine comprising: an oscillator, having an output terminal and power supply terminal and including said oscillation coil, for generating an output signal to be applied to an amplifying circuit connected to said output terminal so that the frequency of said output signal varies in accordance with said variations in inductance of said oscillation coil, an amplifying circuit, having an input terminal for receiving said output signal and a power supply terminal, for producing said electrical signal, said electrical signal varying as a function of variations in the frequency of said oscillator output signal, connecting means connecting said oscillator to said amplifying circuit comprising an input coupling condenser, a connecting wire, and an output coupling condenser connected in series between said output terminal of said oscillator and said input terminal of said amplifying circuit, and high impedance coil means comprising first and second coils, said first coil being connected between said power supply terminal of said oscillator and said connecting wire, and said second coil being connected between said power terminal of said amplifying circuit and said connecting wire.
Claim 3
Dependent Claim
15 words
Apparatus as in claim 1, wherein said connecting wire is formed with a coaxial cable.
References Cited (Backward Citations)
US2848710A
Cited
US2847625A
Cited
US2883976A
Cited
US3287715A
Cited
US3327526A
Cited
US3448728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |