Homogeneous charge compression ignition internal combustion engine

Abstract

A homogeneous charge compression ignition internal combustion engine capable of reliably reducing flame noise at a time of high-load operation is provided. The engine includes an injector 12a which injects a liquid hydrocarbon fuel to an intake port 23, and an injector 12b which directly injects an alcohol fuel into a combustion chamber 21. The liquid hydrocarbon fuel is distributed to an outer peripheral side of the combustion chamber 21, and the alcohol fuel is distributed to a central portion. The engine includes intake valves 25a and 25b, and divides an intake stroke into a period in which the intake valve 25a is stopped and a fuel-gas mixture is flown, and a period in which the intake valves 25a and 25b are operated and the flow is suppressed, guides the liquid hydrocarbon fuel into the combustion chamber 21 during the flow period, and injects the alcohol fuel to the combustion chamber 21 during the flow suppression period. The engine includes separating means for mixing water into a composite fuel of the liquid hydrocarbon and alcohol and separating it into an alcohol-water mixture solution and the liquid hydrocarbon, supplying means 6 for supplying the liquid hydrocarbon to the injector 12a, and supplying means 9 for supplying the alcohol-water mixture solution to the injector 12b.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a system block diagram showing one configuration example of an internal combustion engine system including a homogeneous charge compression ignition internal combustion engine of the present invention;

FIG. 2 is an explanatory sectional view showing one configuration example of the homogeneous charge compression ignition internal combustion engine of the present invention;

FIG. 3 is a plan view showing one configuration example of the homogeneous charge compression ignition internal combustion engine of the present invention;

FIGS. 4A to 4D and 5A to 5D are graphs showing distributions of heat generation of low temperature oxidation reaction and an air fuel ratio in the homogeneous charge compression ignition internal combustion engine of the present invention; and

FIGS. 6A and 6B are graphs showing the relationship between a crank angle, and heat generation of the low temperature oxidation reaction and pressure in the homogeneous charge compression ignition internal combustion engine of the present invention.

Claims

1. A homogeneous charge compression ignition internal combustion engine comprising an intake port guiding a gaseous mixture into a combustion chamber, a first injector injecting a first fuel to the intake port, and a second injector directly injecting a second fuel into the combustion chamber, the engine compresses a fuel-gas mixture including the fuels supplied from both of the injectors to cause the same to self-ignite, wherein the first fuel is a liquid hydrocarbon fuel, and the second fuel is an alcohol fuel.

2. The homogeneous charge compression ignition internal combustion engine according to claim 1, wherein the gaseous mixture including the liquid hydrocarbon fuel guided from said intake port is distributed to an outer peripheral side in said combustion chamber, and said alcohol fuel injected from said second injector is distributed to a central portion in the combustion chamber.

3. The homogeneous charge compression ignition internal combustion engine according to claim 2, further comprising: a plurality of intake valves,wherein an intake stroke is divided into a period in which any one of the intake valves is stopped, and said fuel-gas mixture guided into said combustion chamber flows inside the combustion chamber, and a period in which all the intake valves are operated, and flow of the fuel-gas mixture is suppressed, andwherein in the period in which the fuel-gas mixture flows, a gaseous mixture including said liquid hydrocarbon fuel is guided into the combustion chamber from said intake port, and in the period in which the flow of the fuel-gas mixture is suppressed, said alcohol fuel is injected into the combustion chamber from said second injector.

4. The homogeneous charge compression ignition internal combustion engine according to claim 3, wherein said intake ports are constituted of only straight type intake ports.

5. The homogeneous charge compression ignition internal combustion engine according to claim 3, wherein said intake ports are constituted of the straight type intake port and a swirl type intake port.

6. The homogeneous charge compression ignition internal combustion engine according to claim 1, further comprising: separating means for separating a composite fuel composed of liquid hydrocarbon and alcohol into an alcohol-water mixture solution in which the water and the alcohol are mixed and the liquid hydrocarbon by mixing water thereinto;first supplying means for supplying the liquid hydrocarbon separated in the separating means to said first injector; andsecond supplying means for supplying the alcohol-water mixture solution separated in the separating means to said second injector.

7. The homogeneous charge compression ignition internal combustion engine according to claim 1, wherein said liquid hydrocarbon fuel is gasoline.

8. The homogeneous charge compression ignition internal combustion engine according to claim 1, wherein said liquid hydrocarbon fuel is naphtha.

9. The homogeneous charge compression ignition internal combustion engine according to claim 1, wherein said alcohol fuel is ethanol.