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US4715326A Expired / Lapsed US ⏱️ 0.0 years remaining

Multicylinder catalytic engine

Assignee: Southwest Research Institute
•
Filing: 1986-09-08
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Granted: 1987-12-29
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Expires: 2006-09-08
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Abstract

Abstract An unthrottled multicylinder catalytic engine having first and second cylinders with first and second pistons, respectively, reciprocating therein. A mixture of air and fuel is inserted into the first cylinder, compressed in the first cylinder, and combustion is initiated, if necessary, during start-up. A transfer passageway communication between the first and second cylinders receives the compressed mixture and a catalyst positioned in the passageway oxidizes or ignites the mixture to provide the power stroke for operating the second piston. Thereafter, the oxidized or burnt mixture is exhausted from the second cylinder. The compressed gas may be heated in the passageway by the exhaust heat.

Inventors

  • 👤 Robert H. Thring

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 01:33
CPC Classifications
F; F02; F02B; F02B41/00; F02B41/02; F02B41/06; F02B43/00; F02B43/08; F02B51/00; F02B51/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/30

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 194 words
A multicylinder catalyst engine comprising, a first cylinder and a first piston reciprocating therein, a second cylinder and a second piston reciprocating therein, said first cylinder including an intake port, an intake valve in the intake port admitting all of the air and fuel for the engine, air/fuel mixing means connected to the intake port, said intake valve being opened as the first piston draws an air/fuel mixture into the first cylinder, and said intake valve being closed as the first piston moves to compress the mixture, a transfer passageway in communication between the first and second cylinders, a transfer valve in the passageway adjacent the first cylinder closing while the air/fuel mixture is drawn into the first cylinder and opening when the mixture in the first cylinder is compressed for transferring the compressed mixture from the first cylinder toward the second cylinder, a catalyst positioned in the passageway downstream of the transfer valve for igniting the compressed mixture when the transfer valve is closed thereby powering the second piston, an exhaust port connected to the second cylinder, and an exhaust valve positioned in the exhaust port for exhausting gas from the second cylinder.
Claim 2
Dependent Claim 194 words
A multicylinder catalyst engine comprising, a first cylinder and a first piston reciprocating therein, a second cylinder and a second piston reciprocating therein, said first cylinder including an intake port, an intake valve in the intake port admitting all of the air and fuel for the engine, air/fuel mixing means connected to the intake port, said intake valve being opened as the first piston draws an air/fuel mixture into the first cylinder, and said intake valve being closed as the first piston moves to compress the mixture, a transfer passageway in communication between the first and second cylinders, a transfer valve in the passageway adjacent the first cylinder closing while the air/fuel mixture is drawn into the first cylinder and opening when the mixture in the first cylinder is compressed for transferring the compressed mixture from the first cylinder toward the second cylinder, a catalyst positioned in the passageway downstream of the transfer valve for igniting the compressed mixture when the transfer valve is closed thereby powering the second piston, an exhaust port connected to the second cylinder, and an exhaust valve positioned in the exhaust port for exhausting gas from the second cylinder.
Claim 3
Dependent Claim 32 words
The apparatus of claim 1 including a heat exchanger positioned adjacent the passageway and connected to the exhaust port for heating the compressed mixture in the passageway from the waste exhaust heat.
Claim 4
Dependent Claim 13 words
The apparatus of claim 1 wherein the air/fuel mixing means includes a carburetor.
Claim 5
Dependent Claim 22 words
The apparatus of claim 1 wherein the second piston leads the first piston by a crank angle of between 45° and 90°.
Claim 6
Dependent Claim 13 words
The apparatus of claim 1 including, combustion initiating means in the first cylinder.
Claim 7
Independent Claim 130 words
The method of operating a catalytic internal combustion engine having a first cylinder with a first piston reciprocating therein and a second cylinder with a second piston reciprocating therein comprising, premixing all of the air/fuel mixture and inserting all of the mixture into the first cylinder while blocking the mixture from entering the second cylinder, and being exposed to the catalyst prior to compression of the mixture, compressing the mixture in the first cylinder, transferring the compressed mixture from the first cylinder thorugh a catalyst for igniting the compressed air/fuel mixture thereby providing an expanding gas, transferring the expanding gas to the second cylinder and closing communication between the first and second cylinders for providing a power stroke for the second piston, and exhausting the gas from the second cylinder.
Claim 8
Independent Claim 130 words
The method of operating a catalytic internal combustion engine having a first cylinder with a first piston reciprocating therein and a second cylinder with a second piston reciprocating therein comprising, premixing all of the air/fuel mixture and inserting all of the mixture into the first cylinder while blocking the mixture from entering the second cylinder, and being exposed to the catalyst prior to compression of the mixture, compressing the mixture in the first cylinder, transferring the compressed mixture from the first cylinder thorugh a catalyst for igniting the compressed air/fuel mixture thereby providing an expanding gas, transferring the expanding gas to the second cylinder and closing communication between the first and second cylinders for providing a power stroke for the second piston, and exhausting the gas from the second cylinder.
Claim 9
Dependent Claim 16 words
The method of claim 6 including, initiating combustion of the compressed mixture in the first cylinder.
Claim 10
Dependent Claim 28 words
The method of claim 6 including, heating the compressed mixture as it leaves the first cylinder from the heat of the waste exhaust gas from the second cylinder.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-12-28 1991-06-29 1991-12-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-12-28 1995-06-29 1995-12-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-12-28 1999-06-29 1999-12-29 $7700.00 Window Closed / Lapsed

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