# US 4,395,998 A · Multi-fuel gasifier system for spark ignition engines

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,395,998 A
- Document ID: US4395998A
- Status: Granted
- Kind: A
- Application number: 06/271,854
- Filed: 1981-06-09
- Granted: 1983-08-02
- Earliest claimed: 1981-06-09
- Assignees: How Tong Industrial Co. Ltd.
- Inventors: You-May Chou
- Web page: https://patentgrep.com/patent/US4395998A

## CPC

- F02M 31/093: Air intake passage surrounding the exhaust gas passage; Exhaust gas passage surrounding the air intake passage
- F02B 13/00: Engines characterised by the introduction of liquid fuel into cylinders by use of auxiliary fluid
- F02M 31/16: Other apparatus for heating fuel
- F02B 1/04: with fuel-air mixture admission into cylinder
- F02B 3/06: with compression ignition (compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02)
- F02F 2007/0092: {Transparent materials}
- Y02T 10/12: Improving ICE efficiencies
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A multi-fuel gasifier system for internal combustion engines comprising a hollow casing having heat conducting plates therein in thermal contact with a heat exchange duct passing through the casing through which hot exhaust gas passes from the exhaust manifold to the exhaust pipe, a gasifying chamber substantially centrally located within the casing and surrounded by the heat conducting plates and defined by inner wall portions of the plates. An inlet in the casing wall communicates with one end of the chamber and the outlet of the carburetor. An outlet through the casing wall communicates with the other end of the chamber and the intake manifold of the engine. Adjacent the inlet end of the chamber is a first perforated vaporization cap through which fuel-air mixture from the carburetor passes and thereafter contacts a second conically shaped vaporization cap which deflects and sprays the fuel mixture into the vaporization chamber. Downstream of the conical vaporization cap is a second high temperature vaporization section of the chamber which is defined by that portion of the chamber surrounded by the inner walls of the heat conducting plates. An auxiliary fuel tank is provided and is connected to a pre-heating fuel line extending through the heat exchange pipe and coiled around the second high temperature vaporization section of the chamber so that fuel fed through one end is heated before passing to the carburetor inlet where it is mixed with the primary fuel prior to being mixed with air in the caburetor and passed into contact with the vaporization caps and through the gasification chamber of the gasifier. This invention is particularly useful for gasifying lower grade fuels such as diesel oil, or kerosine, for use in IC engines and for mixing lower grade fuels with gasoline for increasing power, efficiency, and economy of operating IC engines.

## Claims

### Claim 1

A multi-fuel gasifier for internal combustion engines having a carburetor, fuel pump, fuel line to the carburetor and intake and exhaust systems, comprising, a hollow casing, an inlet to said casing adapted to be connected to the air-fuel mixture outlet of a carburetor, an outlet from said casing adapted to be connected to the engine intake manifold, a gasifying chamber within said casing between said inlet and outlet, a plurality of heat conducting plates supported in spaced relationship with respect to each other within said casing with portions thereof forming at least part of the walls defining said chamber, heat conducting pipe means extending through said casing in thermal conducting contact with said plates having an inlet adapted to be connected to the engine exhaust manifold and an outlet adapted to be connected to the exhaust pipe, a heat transfer pipe connected at its ends to said exhaust manifold and said inlet of said heat conducting pipe means respectively and between its ends to one end of a heat regulator pipe, the other end of said heat regulator pipe being connected to the exhaust pipe, a heat regulating valve in said heat regulating pipe for controlling the flow of exhaust gas through said heat transfer pipe, means for operating said heat regulating valve, an auxiliary fuel tank, an auxiliary fuel line from said auxiliary fuel tank, a pre-heating fuel line extending through at least that part of said heat conducting pipe means that is disposed within said casing and in thermal conducting relationship with the exhaust gas within said heat conducting pipe means, and said pre-heating fuel line having an inlet connected to said auxiliary fuel lines and an outlet connected to the carburetor fuel inlet.

### Claim 2 (depends on 1)

A multi-fuel gasifier as claimed in claim 1 and further comprising a first vaporization cap in said chamber adjacent said chamber inlet, a plurality of perforations in said first vaporization cap for passing said fuel-air mixture therethrough, a second conically shaped vaporization cap in said chamber in a position to have fuel-air mixture passing through said first vaporization cap impinge on its surface to spray said fuel-air mixture substantially radially outwardly.

### Claim 3 (depends on 2)

A multi-fuel gasifier as claimed in claim 2 and further comprising a first gasifying section in said chamber between said first and second vaporization caps, and a second high temperature gasifying section between said second vaporization cap and said casing outlet in that part of said chamber where the chamber walls are formed by said portions of said heat conducting plates.

### Claim 4 (depends on 3)

A multi-fuel gasifier as claimed in claim 3 wherein said portions of said heat conducting plates that form said walls of said chamber are cylindrical, and said pre-heating fuel line is coiled at least once around said cylindrical section of said chamber.