Double-isometric thermodynamic cycle engine and combustion control method thereof

The invention relates to the technical field of engines, and provides a double-equal-capacity thermodynamic cycle engine and a combustion control method thereof.The double-equal-capacity thermodynamic cycle engine comprises an air cylinder, a first nozzle, a second nozzle, a spark plug, a wide oxygen sensor and a controller; the first nozzle is connected to an air inlet channel of the air cylinder or the end of the air cylinder and used for spraying anti-knock fuel into the main combustion chamber. The second nozzle is connected to the jet chamber and used for jetting hydrogen fuel into the jet chamber; the controller can adjust the injection time, the injection time and the injection times of the first nozzle and the second nozzle according to the average effective pressure of the engine and the excess air coefficient of mixed gas in an air cylinder, the engine is controlled to form two times of sequential isometric heat release before and after a compression top dead center, the mixed gas at the edge of a m