Glow plug engine
View Patent ↗The object of the present invention is to provide a glow-plug engine capable of achieving suitable operation using a glow plug even for various kinds of fuel other than special alcohol based fuel. The end section of a glow plug protrudes inside a combustion chamber and is located in a specified area near the top surface 53 a of piston when located at the top dead center. By doing so, it is possible to achieve suitable operation (combustion) using a glow plug even for various kinds of fuel other than special alcohol based fuels.
1. A glow-plug engine comprising:
a combustion chamber to which a premixed air-fuel mixture is introduced,
a piston that compresses the premixed air-fuel mixture introduced in the combustion chamber, and
a glow-plug with a tip end section that is exposed into the combustion chamber for igniting the premixed air-fuel mixture compressed by the piston;
wherein the glow-plug protrudes toward a top surface of the piston in the combustion chamber, and the tip end section of the glow-plug is placed in a prescribed region near the top surface of the piston when the piston is positioned at a top dead center, the prescribed region being determined to set a starting point for combustion of the premixed air-fuel mixture near the top surface of the piston.
2. The glow-plug engine of claim 1 ,
wherein the prescribed region satisfies a relationship 0≦G/H≦0.8, where a distance from the tip end section of the glow plug to the top surface of the piston when located at the top dead center is taken to be G, and a distance from the top surface of the piston when located at the top dead center to the top section of the combustion chamber is taken to be H.
3. The glow-plug engine of claim 1 ,
wherein the prescribed region satisfies a relationship 0≦G/B≦0.4, where a distance from the tip end section of the glow plug to the top surface of the piston when located at the top dead center is taken to be G, and a diameter of a cylinder is taken to be B.
4. The glow-plug engine of claim 1 ,
wherein the prescribed region is located in the vicinity above a line extending from a center axis of the top surface of the piston.
5. The glow-plug engine of claim 1 ,
wherein a ratio of compression is 5 or greater and less than 10.
6. The glow-plug engine of claim 1 ,
wherein the glow-plug comprises a cylindrical section that houses a heat core on the tip end side, and a communicator is formed near a tip end of the cylindrical section for communicating an inner space that houses the heat core with the combustion chamber.
7. The glow-plug engine of claim 2 ,
wherein the glow-plug comprises a cylindrical section that houses a heat core on the tip end side, and a communicator is formed near a tip end of the cylindrical section for communicating an inner space that houses the heat core with the combustion chamber.
8. The glow-plug engine of claim 3 ,
wherein the glow-plug comprises a cylindrical section that houses a heat core on the tip end side, and a communicator is formed near a tip end of the cylindrical section for communicating an inner space that houses the heat core with the combustion chamber.
9. The glow-plug engine of claim 4 ,
wherein the glow-plug comprises a cylindrical section that houses a heat core on the tip end side, and a communicator is formed near a tip end of the cylindrical section for communicating an inner space that houses the heat core with the combustion chamber.
10. The glow-plug engine of claim 5 ,
wherein the glow-plug comprises a cylindrical section that houses a heat core on the tip end side, and a communicator is formed near a tip end of the cylindrical section for communicating an inner space that houses the heat core with the combustion chamber.
11. The glow-plug engine of claim 1 ,
wherein the premixed air-fuel mixture includes a fuel having an ignition point that is lower than that of alcohol, and air.
12. The glow-plug engine of claim 2 ,
wherein the premixed air-fuel mixture includes a fuel having an ignition point that is lower than that of alcohol, and air.
13. The glow-plug engine of claim 3 ,
wherein the premixed air-fuel mixture includes a fuel having an ignition point that is lower than that of alcohol, and air.
14. The glow-plug engine of claim 4 ,
wherein the premixed air-fuel mixture includes a fuel having an ignition point that is lower than that of alcohol, and air.
15. The glow-plug engine of claim 5 ,
wherein the premixed air-fuel mixture includes a fuel having an ignition point that is lower than that of alcohol, and air.
16. The glow-plug engine of claim 1 ,
wherein the premixed air-fuel mixture includes a fuel selected from the group consisting of gasoline, LP gas, and kerosene; and air.
17. The glow-plug engine of claim 2 ,
wherein the premixed air-fuel mixture includes a fuel selected from the group consisting of gasoline, LP gas, and kerosene; and air.
18. The glow-plug engine of claim 3 ,
wherein the premixed air-fuel mixture includes a fuel selected from the group consisting of gasoline, LP gas, and kerosene; and air.
19. The glow-plug engine of claim 4 ,
wherein the premixed air-fuel mixture includes a fuel selected from the group consisting of gasoline, LP gas, and kerosene; and air.
20. The glow-plug engine of claim 5 ,
wherein the premixed air-fuel mixture includes a fuel selected from the group consisting of gasoline, LP gas, and kerosene; and air.