US4007718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for correcting the air/petrol ratio for an internal combustion engine
Assignee: Individual
•
Filing: 1973-07-17
•
Granted: 1977-02-15
•
Expires: 1993-07-17
Abstract
Abstract A device for correcting the proportioning of the air/petrol mixture furnished by a proportioning means to an internal combustion engine comprising a probe producing a signal which is a function of the oxygen or carbon monoxide content of engine exhaust gas and an auxiliary air admission valve downstream of the air/petrol proportioning means, this valve being periodically operable by control means sensitive to said signal.
Inventors
- 👤 Bernard R. Laprade
- 👤 Xavier J. Laprade
- 👤 Pierre J. Gele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:37
CPC Classifications
F; F02; F02M; F02M23/00; F02M23/04; F02D; F02D9/00; F02D2700/00; F02D2700/09; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
190 words
A device for correcting the proportioning of the air-petrol mixture furnished by a proportioning member to an internal combustion engine having an intake pipe connected from the proportioning member and an exhaust pipe for burnt gases, the device comprising at least one auxiliary air inlet tapped into said intake pipe downstream of the member determining the proportioning of the air-petrol mixture, means for providing auxiliary air to said at least one auxiliary air inlet at overpressure with respect to the pressure prevailing in the intake pipe, at least one valve controlling the air inlet or inlets, a probe arranged in the exhaust pipe for delivering an electric signal which is a function of the composition of the burnt gases, and electronic means releasing electrical pulses controlling the opening of the valve or valves in synchronism with the engine so as to introduce into the mixture a quantity of air predetermined at each cycle of the engine in response to the information from the probe when the concentration of oxygen in the burnt gases is lower than a predetermined value (or the concentration of CO is higher than a predetermined value).
Claim 2
Independent Claim
190 words
A device for correcting the proportioning of the air-petrol mixture furnished by a proportioning member to an internal combustion engine having an intake pipe connected from the proportioning member and an exhaust pipe for burnt gases, the device comprising at least one auxiliary air inlet tapped into said intake pipe downstream of the member determining the proportioning of the air-petrol mixture, means for providing auxiliary air to said at least one auxiliary air inlet at overpressure with respect to the pressure prevailing in the intake pipe, at least one valve controlling the air inlet or inlets, a probe arranged in the exhaust pipe for delivering an electric signal which is a function of the composition of the burnt gases, and electronic means releasing electrical pulses controlling the opening of the valve or valves in synchronism with the engine so as to introduce into the mixture a quantity of air predetermined at each cycle of the engine in response to the information from the probe when the concentration of oxygen in the burnt gases is lower than a predetermined value (or the concentration of CO is higher than a predetermined value).
Claim 3
Dependent Claim
34 words
A device as claimed in claim 1 in which said electronic means prevents the arrival of an opening signal at the valve as long as the latter has not dropped back on its seat.
Claim 4
Dependent Claim
33 words
A device as claimed in claim 1 in which said electronic means provides opening pulses to said valve when the concentration of oxygen is lower than a predetermined value of near to zero.
Claim 5
Dependent Claim
22 words
A device as claimed in claim 1 in which the additional air is at an absolute pressure of 1 to 1.5 bars.
Claim 6
Dependent Claim
27 words
A device as claimed in claim 1 in which the additional air inlet into the intake pipe opens directly onto the center of said pipe's cross section.
Claim 7
Dependent Claim
39 words
A device as claimed in claim 1 in which said valve furnishes a unit quantity of additional air at each lifting of said valve that is less than 15% of the unit cylinder capacity of the internal combustion engine.
Claim 8
Dependent Claim
40 words
A device as claimed in claim 6 in which said valve furnishes a unit quantity of additional air at each lifting of said valve that is between 5 and 10% of the unit cylinder capacity of the internal combustion engine.
References Cited (Backward Citations)
US3738341A
Cited
US3641767A
Cited
US3745768A
Cited
US3759232A
Cited
US3827237A
Cited
US3831564A
Cited
US3799301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |