Patent US2990748A successfully refreshed from Google Patents.
Patent US4886034A successfully refreshed from Google Patents.
US4886034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine control system
Assignee: MARATHON ENGINE SYSTEMS Inc
•
Filing: 1989-03-30
•
Granted: 1989-12-12
•
Expires: 2009-03-30
Abstract
Abstract An internal combustion engine is provided with a biased by-pass throttle valve that trims the flow of supplementary combustion air for mixing with basic combustion air and fuel induced in carburetor venturi. The by-pass throttle valve is controlled by an electrical stepmotor that is regulated by a pre-programmed microprocessor in response to sensed engine speed and engine manifold pressure conditions to thereby improve engine operating efficiency and reduce noxious emissions without utilizing catalytic converter equipment.
Inventors
- 👤 John E. Lambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:24
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/24; F02D41/2406; F02D31/00; F02D31/001; F02D31/002; F02D31/003; F02D31/005; F02M; F02M23/00; F02M23/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
156 words
Internal combustion engine control system apparatus comprising: (a) carburetor venturi means flowing basic combustion air and having an induced fuel flow in said basic combustion air; (b) carburetor by-pass throttle valve means having a biased open position and causing and trimming the flow of supplementary combustion air parallel to and then into said basic combustion air for mixing; (c) engine throttle valve means regulating the flow of a mixture of said supplementary combustion air and said basic combustion air with induced fuel flow for engine combustion; (d) separate electrical step motor means connected to said carburetor by-pass throttle valve means and to said engine throttle valve means; and (e) pre-programmed microprocessor means connected to each of said electrical stepmotor means, said microprocessor means controlling one of said electrical stepmotor means and the trim positioning of said carburetor by-pass throttle valve means in response to sensed engine speed and sensed engine manifold pressure or throttle position conditions.
Claim 2
Dependent Claim
156 words
Internal combustion engine control system apparatus comprising: (a) carburetor venturi means flowing basic combustion air and having an induced fuel flow in said basic combustion air; (b) carburetor by-pass throttle valve means having a biased open position and causing and trimming the flow of supplementary combustion air parallel to and then into said basic combustion air for mixing; (c) engine throttle valve means regulating the flow of a mixture of said supplementary combustion air and said basic combustion air with induced fuel flow for engine combustion; (d) separate electrical step motor means connected to said carburetor by-pass throttle valve means and to said engine throttle valve means; and (e) pre-programmed microprocessor means connected to each of said electrical stepmotor means, said microprocessor means controlling one of said electrical stepmotor means and the trim positioning of said carburetor by-pass throttle valve means in response to sensed engine speed and sensed engine manifold pressure or throttle position conditions.
Claim 3
Dependent Claim
40 words
The apparatus defined by claim 1 wherein said microprocessor means controls the other of said electrical stepmotor means and the positioning of said engine throttle valve means in response to an engine speed command and a sensed engine speed condition.
Claim 4
Dependent Claim
48 words
The apparatus defined by claim 1 wherein said by-pass throttle valve means is biased in an open condition to provide a supplementary combustion air flow that is at least approximately from 40% to 60% of said carburetor venturi means basic combustion air flow in all engine operating conditions.
Claim 5
Dependent Claim
66 words
The apparatus defined by claim 1 wherein said microprocessor means controls the trim positioning of said carburetor by-pass throttle valve means to a maximum trim position in response to a sensed engine speed corresponding approximately to the engine steady operating condition design speed and in response to a sensed engine manifold pressure or throttle position corresponding approximately to within the upper portion of the design range.
Claim 6
Dependent Claim
49 words
The apparatus defined by claim 1 wherein said microprocessor means controls the trim positioning of said carburetor by-pass throttle valve means to a near-zero trim position in response to a sensed engine speed corresponding to within approximately the below mid-range or above mid-range engine operating condition design speed range.
Claim 7
Independent Claim
108 words
A method of controlling the flow of air and fuel to an internal combustion engine, comprising the steps of: (a) flowing a quantity of basic combustion air and induced fuel; (b) flowing a biased quantity of supplementary combustion air; (c) mixing said supplementary combustion air with said and basic combustion air and induced fuel; (d) regulating the flow of said mixed air to the internal combustion engine in response to an engine speed command signal; and (e) trimming the flow of said biased quantity of supplementary air in response to a sensed engine speed condition and in response to a sensed engine manifold pressure or throttle position condition.
Claim 8
Independent Claim
108 words
A method of controlling the flow of air and fuel to an internal combustion engine, comprising the steps of: (a) flowing a quantity of basic combustion air and induced fuel; (b) flowing a biased quantity of supplementary combustion air; (c) mixing said supplementary combustion air with said and basic combustion air and induced fuel; (d) regulating the flow of said mixed air to the internal combustion engine in response to an engine speed command signal; and (e) trimming the flow of said biased quantity of supplementary air in response to a sensed engine speed condition and in response to a sensed engine manifold pressure or throttle position condition.
Claim 9
Dependent Claim
27 words
The method defined by claim 6 wherein said biased quantity of supplementary air is approximately 40% to 60% said quantity of basic combustion air and induced fuel.
Claim 10
Dependent Claim
66 words
The method defined by claim 6 wherein said trimming of the flow of supplementary air is a maximum trimming in response to a sensed engine speed condition corresponding approximately to the engine steady operating condition design speed and in response to a sensed engine manifold pressure or throttle position condition corresponding approximately to within the upper portion of the engine operating manifold pressure condition design range.
Claim 11
Dependent Claim
42 words
The method defined by claim 8 wherein said trimming of the flow of supplementary air is a near-zero trimming in response to sensed engine speed conditions corresponding to within approximately the below mid-range and above mid-range engine operating condition design speed range.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |