Engine

1 . An engine, comprising:

an engine body including a main combustion chamber;

an intake line connected to a combustion chamber of the engine body, the intake line including an intake port formed in a cylinder head of the engine body, the intake port having one end connected to the main combustion chamber, and an intake pipe connected to the other end of the intake port;

a first fuel line connected to the intake line and configured to supply a first fuel to the intake line; and

a second fuel line connected to the intake line at a position downstream of where the first fuel line is connected and configured to supply a second fuel having a lower explosive limit that is lower than that of the first fuel;

a turbocharger including a compressor for compressing air flowing through the intake line; and

an air cooler disposed between the compressor and the engine body in the intake line, wherein the first fuel line is connected to the intake line at a position upstream of the compressor,

wherein the second fuel line is connected to the intake line at a position downstream of the compressor,

wherein the second fuel line is connected directly to the intake port of the intake line at a position between the air cooler and an intake valve of the engine body to supply the second fuel directly into the intake port;

wherein the first fuel is methane, and

wherein the second fuel is hydrogen.

2 . An engine, comprising:

an engine body including a main combustion chamber and a precombustion chamber communicating with the main combustion chamber;

an intake line connected to the main combustion chamber of the engine body, the intake line including an intake port formed in a cylinder head of the engine body, the intake port having one end connected to the main combustion chamber, and an intake pipe connected to the other end of the intake port;

at least one fuel line connected to the intake line and configured to supply a first fuel to the intake line; and

a precombustion chamber fuel line connected to the precombustion chamber and configured to supply a second fuel having a lower explosive limit that is lower than that of the first fuel to the precombustion chamber;

a turbocharger including a compressor for compressing air flowing through the intake line;

and

an air cooler disposed between the compressor and the engine body in the intake line, wherein the at least one fuel line is connected to the intake line at a position downstream of the compressor, and

wherein the at least one fuel line is connected directly to the intake port of the intake line at a position between the air cooler and an intake valve of the engine body to supply the first fuel directly into the intake port.

3 . The engine according to claim 2 ,

wherein the first fuel is methane, and

wherein the second fuel is hydrogen.

4 . The engine according to claim 2 ,

wherein the first fuel is ammonia, and

wherein the second fuel is methane.

5 . The engine according to claim 2 ,

wherein the first fuel is ammonia, and

wherein the second fuel is hydrogen.

6 . An engine, comprising:

an engine body including a main combustion chamber;

an intake line connected to a combustion chamber of the engine body, the intake line including an intake port formed in a cylinder head of the engine body, the intake port having one end connected to the main combustion chamber, and an intake pipe connected to the other end of the intake port;

a first fuel line connected to the intake line and configured to supply a first fuel to the intake line; and

a second fuel line connected to the intake line at a position downstream of where the first fuel line is connected and configured to supply a second fuel having a lower explosive limit that is lower than that of the first fuel;

a turbocharger including a compressor for compressing air flowing through the intake line; and

an air cooler disposed between the compressor and the engine body in the intake line, wherein the first fuel line is connected to the intake line at a position upstream of the compressor,

wherein the second fuel line is connected to the intake line at a position downstream of the compressor,

wherein the second fuel line is connected directly to the intake port of the intake line at a position between the air cooler and an intake valve of the engine body to supply the second fuel directly into the intake port;

wherein the first fuel is ammonia, and

wherein the second fuel is methane.

7 . An engine, comprising:

an engine body including a main combustion chamber;

an intake line connected to a combustion chamber of the engine body, the intake line including an intake port formed in a cylinder head of the engine body, the intake port having one end connected to the main combustion chamber, and an intake pipe connected to the other end of the intake port;

a first fuel line connected to the intake line and configured to supply a first fuel to the intake line; and

a second fuel line connected to the intake line at a position downstream of where the first fuel line is connected and configured to supply a second fuel having a lower explosive limit that is lower than that of the first fuel;

a turbocharger including a compressor for compressing air flowing through the intake line; and

an air cooler disposed between the compressor and the engine body in the intake line, wherein the first fuel line is connected to the intake line at a position upstream of the compressor,

wherein the second fuel line is connected to the intake line at a position downstream of the compressor,

wherein the second fuel line is connected directly to the intake port of the intake line at a position between the air cooler and an intake valve of the engine body to supply the second fuel directly into the intake port;

wherein the first fuel is ammonia, and

wherein the second fuel is hydrogen.