US3678732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the simultaneous and quantitative detection of the detonation and preignition
Assignee: SnamProgetti SpA
•
Filing: 1970-03-11
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Granted: 1972-07-25
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Expires: 1990-03-11
Abstract
Abstract A system for simultaneously and quantitatively measuring the detonation and preignition in an internal combustion engine by evaluating the pressure variations in an engine cylinder for a given time after peak pressure in the cylinder and by evaluating a signal having frequency proportional to engine speed for a period between the occurrence of an ignition signal and peak pressure.
Inventors
- 👤 Virgilio Arrigoni
- 👤 Franco Sezzi
- 👤 Bruno Gaetani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:50
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/08; F; F02; F02D; F02D35/00; F02D35/02; F02D35/023; G01L; G01L23/00; G01L23/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
231 words
A system for simultaneously and quantitatively determining the detonation and preignition in an internal combustion engine, in response to an ignition signal, including: a single transducer operably connected to said engine for producing signals in accordance with the variations in pressure within said engine; peak pressure circuit means operably connected to said transducer and responsive thereto for producing a detonation gating signal of predetermined duration when the pressure in said engine attains a maximum value; detonation gating circuit means operably connected to said transducer and to said peak pressure circuit meanS for enabling transmission of the transducer signals upon occurrence of said detonation gating signal; pulse generator means for producing a train of pulses having a frequency proportional to the speed of said engine; gate generator circuit means operably connected to said peak pressure circuit means and responsive to said ignition signal and to said detonation gatinG signal for producing a preignition gating signal having a duration defined by said ignition signal and said detonation gating signal; preignition gating circuit means operably connected to said pulse generator and to said gate generator circuit for enabling transmission of said train of pulses upon occurrence of said preignition gating signal; and measuring means operably connected to said detonation gating circuit and to said preignition gating circuit and responsive to the transmitted transducer signals and to the transmitted train of pulses for evaluating same.
Claim 2
Independent Claim
231 words
A system for simultaneously and quantitatively determining the detonation and preignition in an internal combustion engine, in response to an ignition signal, including: a single transducer operably connected to said engine for producing signals in accordance with the variations in pressure within said engine; peak pressure circuit means operably connected to said transducer and responsive thereto for producing a detonation gating signal of predetermined duration when the pressure in said engine attains a maximum value; detonation gating circuit means operably connected to said transducer and to said peak pressure circuit meanS for enabling transmission of the transducer signals upon occurrence of said detonation gating signal; pulse generator means for producing a train of pulses having a frequency proportional to the speed of said engine; gate generator circuit means operably connected to said peak pressure circuit means and responsive to said ignition signal and to said detonation gatinG signal for producing a preignition gating signal having a duration defined by said ignition signal and said detonation gating signal; preignition gating circuit means operably connected to said pulse generator and to said gate generator circuit for enabling transmission of said train of pulses upon occurrence of said preignition gating signal; and measuring means operably connected to said detonation gating circuit and to said preignition gating circuit and responsive to the transmitted transducer signals and to the transmitted train of pulses for evaluating same.
Claim 3
Dependent Claim
22 words
A system according to claim 1 wherein said peak pressure circuit means includes a monostable multivibrator triggered by the peak pressure event.
Claim 4
Dependent Claim
22 words
A system according to claim 2 wherein the duration of the output of said monostable multivibrator is a function of engine speed.
Claim 5
Dependent Claim
30 words
A system according to claim 1 wherein said gate generator circuit means includes a bistable multivibrator which is set by said ignition signal and reset by said detonation gating signal.
References Cited (Backward Citations)
US3010313A
Cited
US3247705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |