Multiple combustion mode engine with ammonia fuel and control method thereof

A control method of a multiple combustion mode engine with ammonia fuel, comprising:

• a premixed combustion mode:
• under starting, idling and small-load working condition of the engine, upon predetermining a first timing when a jet flame of a pre-chamber comprised in the engine is generated, enabling a second timing when an ammonia injector comprised in the engine injects ammonia gas in a main combustion chamber comprised in the engine to be earlier than the first timing when the jet flame of the pre-chamber is generated in the main combustion chamber;
• mixing the ammonia gas entering the main combustion chamber with air in the main combustion chamber to form homogeneous premixed gas;
• under a compression action of a piston comprised in the engine, igniting the homogeneous premixed gas by the jet flame of the pre-chamber near a top dead center of the compression stroke of the engine, spreading and developing a flame of the homogeneous premixed gas, and completing a combustion process by the engine;
• and
• a diffusion combustion mode:
• upon the engine operating under middle-or-high load working condition, injecting the ammonia gas to the main combustion chamber near the top dead center of the compression stroke of the engine by the ammonia injector;
• enabling the second timing when the ammonia injector injects the ammonia gas to be slightly later than the first timing when the jet flame of the pre-chamber is generated, or injecting the ammonia gas by the ammonia injector at the first timing when the jet flame of the pre-chamber is generated;
• and synchronously performing injection of the ammonia gas in the main combustion chamber and mixture of the ammonia gas injected by the ammonia injector with the air in the main combustion chamber, wherein the ammonia gas and the air in the main combustion chamber are in a non-premixed state.