# US 2006/0185625 A1 · Method for controlling compression ignition internal combustion engine

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- Number: US 2006/0185625 A1
- Document ID: US20060185625A1
- Status: Published application
- Kind: A1
- Application number: 11/349,103
- Filed: 2006-02-08
- Published: 2006-08-24
- Earliest claimed: 2005-02-24
- Assignees: Honda Motor Co., Ltd.
- Inventors: Kohtaro Hashimoto; Kohjiroh Aimoto; Fumiaki Ikegawa; Takahiro Gunji
- Web page: https://patentgrep.com/patent/US20060185625A1

## CPC

- F02B 51/00: Other methods of operating engines involving pretreating of, or adding substances to, combustion air, fuel, or fuel-air mixture of the engines
- F02D 19/0649: {Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers}
- F02D 19/0671: {Means to generate or modify a fuel, e.g. reformers, electrolytic cells or membranes}
- F02M 25/12: the apparatus having means for generating such gases (using rays and simultaneously generating ozone F02M27/06)
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/30: Use of alternative fuels, e.g. biofuels
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The present invention provides a method for controlling a compression ignition internal combustion engine, which can easily cope with a wide range of demand load with the use of a single fuel. The method includes: providing fuel 2 containing an ignition enhancer for the compression ignition internal combustion engine 1; thermally decomposing a part of the ignition enhancer included in the fuel 2 to make the fuel 2 less ignitable as the compression ignition internal combustion engine has a higher demand load; and supplying the fuel having the a lower ignitability to the compression ignition internal combustion engine 1. The fuel capable of compression self-ignition is a hydrocarbon-based fuel. The ignition enhancer is one selected from the group consisting of an organic peroxide, a nitric ester, a nitrite ester and an azo compound. The organic peroxide is di-tert-butyl peroxide. The nitric ester is 2-ethylhexyl nitrate. The nitrite ester is n-pentyl nitrite. The azo compound is 2,2-azobis(2,4-dimethylvaleronitrile). The ignition enhancer is thermally decomposed in an electric furnace.

## Claims

### Claim 1

A method for controlling a compression ignition internal combustion engine in which an oxygen-containing gas and a fuel capable of compression self-ignition are introduced into a cylinder and are compressed for self-ignition, the method comprising the steps of:
providing a fuel containing an ignition enhancer for the compression ignition internal combustion engine;
thermally decomposing a part of the ignition enhancer included in the fuel to make the fuel less ignitable as the compression ignition internal combustion engine has a higher demand load; and
supplying the fuel having the lower ignitability to the compression ignition internal combustion engine.

### Claim 2 (depends on 1)

The method for controlling the compression ignition internal combustion engine according to claim 1, wherein the fuel capable of compression self-ignition is a hydrocarbon-based fuel.

### Claim 3 (depends on 2)

The method for controlling the compression ignition internal combustion engine according to claim 2, wherein the hydrocarbon-based fuel is one selected from the group consisting of gas oil, kerosene, gasoline, dimethyl ether and heptane.

### Claim 4 (depends on 1)

The method for controlling the compression ignition internal combustion engine according to claim 1, wherein the ignition enhancer is one selected from the group consisting of an organic peroxide, a nitric ester, a nitrite ester and an azo compound.

### Claim 5 (depends on 4)

The method for controlling the compression ignition internal combustion engine according to claim 4, wherein the organic peroxide is di-tert-butyl peroxide.

### Claim 6 (depends on 4)

The method for controlling the compression ignition internal combustion engine according to claim 4, wherein the nitric ester is 2-ethylhexyl nitrate.

### Claim 7 (depends on 4)

The method for controlling the compression ignition internal combustion engine according to claim 4, wherein the nitrite ester is n-pentyl nitrite.

### Claim 8 (depends on 4)

The method for controlling the compression ignition internal combustion engine according to claim 4, wherein the azo compound is 2,2-azobis(2,4-dimethylvaleronitrile).

### Claim 9 (depends on 1)

The method for controlling the compression ignition internal combustion engine according to claim 1, wherein the ignition enhancer is thermally decomposed in an electric furnace.