Patent US4949862A successfully refreshed from Google Patents.
US4068628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine with designated exhaust burning cylinders
Assignee: Individual
•
Filing: 1976-09-20
•
Granted: 1978-01-17
•
Expires: 1996-09-20
Abstract
Abstract A multi-cylinder, gasoline burning internal combustion engine is converted by modification of the intake and exhaust manifolds to an engine having designated exhaust burning cylinders which burn the exhaust gases that are expelled from the gasoline burning cylinders. The intake manifold is modified to isolate an even number of cylinders as the designated exhaust burning cylinders. Typically, two cylinders are chosen, although in some instances it is possible to designate four or even six cylinders, the number of designated exhaust burning cylinders not exceeding half the total number of cylinders in the engine. A pair of cylinders selected as exhaust burning cylinders have their pistons in the same relative positions and moving in the same relative directions but have spark ignition occurring at 360° with respect to each other. No modification is required to the ignition system of the engine. Both the designated exhaust burning cylinders and the gasoline burning cylinders exhaust into a common exhaust manifold system. The exhaust manifold system is modified so as to draw off the lighter exhaust gases to supply to the isolated intake manifold for the designated exhaust burning cylinders. Fresh air is added to the isolated intake manifold and to the exhaust manifold to combine with the exhaust gases to make conditions suitable for combustion in the designated exhaust burning cylinders. The vapors of the crankcase and the gasoline supply tank may be connected in series and supplied to the isolated intake manifold to provide an additional fuel source for the designated exhaust burning cylinders.
Inventors
- 👤 Charles England Duckworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:55
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/10006; F02M35/10026; F02M35/10052; F02B; F02B69/00; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02M35/104; F02M35/116; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
247 words
A method of modifying a multi-cylinder, gasoline burning internal combustion engine of the type employing times sparked ignition so as to achieve more complete combustion of the fuel supplied thereto and thereby improve the efficiency and economy of operation of the engine and at the same time reduce the levels of pollutants in the exhaust gases vented to the atmosphere, said method comprising the steps of: a. selecting at least two cylinders to be the designated exhaust burning cylinders, said selected cylinders having their pistons at the same relative positions and traveling in the same relative directions during all cycles of the operation of the engine, b. modifying the intake manifold of the engine to isolate the designated exhaust burning cylinders from the remaining gasoline burning cylinders and thereby forming an isolated intake manifold for the designated exhaust burning cylinders, c. maintaining a common exhaust manifold system for both gasoline burning and designated exhaust burning cylinders, d. modifying said common exhaust manifold system by providing a secondary exhaust manifold for drawing off a portion of the exhaust gases from the gasoline burning cylinders and also providing an accumulator means for allowing expansion of the exhaust gases in the common exhaust manifold system to reduce the variations in pressure in the common exhaust manifold system, and e. supplying the isolated intake manifold with a controlled mixture of fresh air and the exhaust gases drawn off by the secondary exhaust manifold for burning in the designed exhaust burning cylinders.
Claim 2
Independent Claim
247 words
A method of modifying a multi-cylinder, gasoline burning internal combustion engine of the type employing times sparked ignition so as to achieve more complete combustion of the fuel supplied thereto and thereby improve the efficiency and economy of operation of the engine and at the same time reduce the levels of pollutants in the exhaust gases vented to the atmosphere, said method comprising the steps of: a. selecting at least two cylinders to be the designated exhaust burning cylinders, said selected cylinders having their pistons at the same relative positions and traveling in the same relative directions during all cycles of the operation of the engine, b. modifying the intake manifold of the engine to isolate the designated exhaust burning cylinders from the remaining gasoline burning cylinders and thereby forming an isolated intake manifold for the designated exhaust burning cylinders, c. maintaining a common exhaust manifold system for both gasoline burning and designated exhaust burning cylinders, d. modifying said common exhaust manifold system by providing a secondary exhaust manifold for drawing off a portion of the exhaust gases from the gasoline burning cylinders and also providing an accumulator means for allowing expansion of the exhaust gases in the common exhaust manifold system to reduce the variations in pressure in the common exhaust manifold system, and e. supplying the isolated intake manifold with a controlled mixture of fresh air and the exhaust gases drawn off by the secondary exhaust manifold for burning in the designed exhaust burning cylinders.
Claim 3
Dependent Claim
39 words
The method according to claim 1 further comprising the step of maintaining the timed spark ignition of the engine in standard form and wherein the cylinders selected as the designated exhaust burning cylinders have their spark timing 360° apart.
Claim 4
Dependent Claim
31 words
The method of claim 1 further comprising the step of modifying the intake manifold of the engine to assure an even distribution of a fuel/air mixture to the gasoline burning cylinders.
Claim 5
Dependent Claim
44 words
The method of claim 1 further comprising the step of drawing off the lighter exhaust gases from the highest point of the accumulator means and supplying these lighter exhaust gases directly to the isolated intake manifold for burning in the designated exhaust burning cylinders.
Claim 6
Dependent Claim
36 words
The method of claim 1 further comprising the steps of maintaining a low pressure environment in the common exhaust manifold system and supplying fresh air to the low pressure environment in the common exhaust manifold system.
Claim 7
Dependent Claim
42 words
The method of claim 1 further comprising the step of venting the vapors generated in the crankcase of the engine and the vapors in the gasoline supply tank directly to the isolated intake manifold for burning in the designated exhaust burning cylinders.
Claim 8
Dependent Claim
106 words
The method of claim 1 further comprising the steps of a. drawing off the lighter exhaust gases from the highest point of the accumulator means and supplying these lighter exhaust gases directly to the isolated intake manifold for burning in the designated exhaust burning cylinders, b. maintaining a low pressure environment in the common exhaust manifold system and supplying fresh air to the low pressure environment of the common exhaust manifold system, and c. venting the vapors generated in the crankcase of the engine and the vapors in the gasoline supply tank directly to the isolated intake manifold for burning in said designated exhaust burning cylinders.
Claim 9
Dependent Claim
229 words
In a multi-cylinder, gasoline burning internal combustion engine of the type employing timed spark ignition, said engine including: a. at least two cylinders selected to be designated exhaust burning cylinders, said selected cylinders having their pistons at the same relative positions and traveling in the same relative directions during all cycles of the operation of the engine, the remaining cylinders being gasoline burning cylinders, b. an isolated intake manifold to supply a combustible mixture to said designated exhaust burning cylinders, c. a common exhaust manifold system for both the gasoline burning and the designated exhaust burning cylinders, said common exhaust manifold system having a secondary exhaust manifold for drawing off a portion of the exhaust gases from the gasoline burning cylinders and also accumulator means for allowing expansion of the exhaust gases in the common exhaust manifold system to reduce the variations in pressure in the common exhaust manifold system, and d. means for supplying the isolated intake manifold with a controlled mixture of fresh air and the exhaust gases drawn off by the secondary exhaust manifold for burning in the designated exhaust burning cylinders, whereby a more complete combustion of the fuel supplied to said engine is achieved thereby improving the efficiency and economy of the operation of the engine and at the same time reducing the levels of pollutants in the exhaust gases vented to the atmosphere.
Claim 10
Dependent Claim
229 words
In a multi-cylinder, gasoline burning internal combustion engine of the type employing timed spark ignition, said engine including: a. at least two cylinders selected to be designated exhaust burning cylinders, said selected cylinders having their pistons at the same relative positions and traveling in the same relative directions during all cycles of the operation of the engine, the remaining cylinders being gasoline burning cylinders, b. an isolated intake manifold to supply a combustible mixture to said designated exhaust burning cylinders, c. a common exhaust manifold system for both the gasoline burning and the designated exhaust burning cylinders, said common exhaust manifold system having a secondary exhaust manifold for drawing off a portion of the exhaust gases from the gasoline burning cylinders and also accumulator means for allowing expansion of the exhaust gases in the common exhaust manifold system to reduce the variations in pressure in the common exhaust manifold system, and d. means for supplying the isolated intake manifold with a controlled mixture of fresh air and the exhaust gases drawn off by the secondary exhaust manifold for burning in the designated exhaust burning cylinders, whereby a more complete combustion of the fuel supplied to said engine is achieved thereby improving the efficiency and economy of the operation of the engine and at the same time reducing the levels of pollutants in the exhaust gases vented to the atmosphere.
Claim 11
Dependent Claim
23 words
The internal combustion engine of claim 8 wherein the spark timing for the at least two designated exhaust burning cylinders is 360° apart.
Claim 12
Dependent Claim
39 words
The internal combustion engine of claim 8 further comprising means for drawing off the lighter exhaust gas products at the highest point on said accumulator means and supplying the lighter exhaust gas products directly to the isolated intake manifold.
Claim 13
Dependent Claim
34 words
The internal combustion engine of claim 8 further comprising means for supplying fresh air to said common exhaust manifold system, said means including a check valve for allowing the inflow of fresh air only.
Claim 14
Dependent Claim
22 words
The internal combustion engine of claim 8 further comprising means for maintaining a low pressure environment in said common exhaust manifold system.
Claim 15
Dependent Claim
55 words
The internal combustion engine of claim 8 further comprising a gasoline supply tank for supply fuel to the gasoline burning cylinders of said engine, and means for venting vapors generated in the crankcase of said engine and said gasoline supply tank directly to the isolated intake manifold for burning in the designated exhaust burning cylinders.
Claim 16
Dependent Claim
89 words
The internal combustion engine of claim 8 further comprising: a. means for drawing off the lighter exhaust gas products at the highest point of said accumulator means and supplying the lighter exhaust gas products directly to said isolated intake manifold for burning in said designated exhaust burning cylinders, b. means for supplying fresh air to said common exhaust manifold systems, said means including a check valve for permitting the inflow of fresh air only, and c. means for maintaining a low pressure environment in said common exhaust manifold system.
References Cited (Backward Citations)
US1603256A
Cited
US1152386A
Cited
US1362080A
Cited
DE360351C
Cited
US1904070A
Cited
US2113602A
Cited
US3426524A
Cited
US3727594A
Cited
US3924576A
Cited
US3779013A
Cited
US3776207A
Cited
US3805752A
Cited
US3941113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |