Control method for combustion system, combustion system and engine

A method for controlling a combustion system, wherein the combustion system comprises a piston, a cylinder and a fuel injector, the piston is slidably arranged in a cylinder chamber of the cylinder, a combustion chamber communicated to the cylinder chamber is provided on top of the piston, a side wall of the combustion chamber is formed with a first arc ridge and a second arc ridge that are spaced apart from each other, and the first arc ridge and the second arc ridge protrude into the combustion chamber;

• the method for controlling a combustion system comprising:
• the fuel injector performing a first main injection and a second main injection at intervals, in which the fuel injector injects fuel to the first arc ridge during the first main injection, the fuel injector injects fuel to the second arc ridge during the second main injection, and velocities of the fuel injected during the first main injection and the second main injection are not lower than a set velocity;
• wherein the piston moves upward in the cylinder and compresses gas in the cylinder chamber when the fuel injector performs the first main injection;
• and the piston moves downward in the cylinder when the fuel injector performs the second main injection;
• and
• wherein when the fuel injector performs the first main injection, a fuel injection hole of the fuel injector faces toward a center of the first arc ridge, a distance between the fuel injection hole of the fuel injector and the center of the first arc ridge is L1, a velocity of the fuel injected from the fuel injection hole of the fuel injector is V1, an ignition delay period of the fuel injected during the first main injection is t1, and t1=L1/V1.