Why can't the engine exceed 3000 rpm in neutral?

[SanElaina]

Manufacturer-set fuel cut-off protection RPM to prevent the engine speed from rising too high when revving in neutral. Fuel cut-off protection: When the engine operates beyond normal parameters or detects abnormal conditions, it will temporarily stop the injectors from working, ceasing fuel delivery to the cylinders. This causes the engine speed to drop or rapidly reduces heat generation to protect the engine. Engine: A machine that converts other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. The term 'engine' can refer either to the power generation device alone or the entire machine including the power unit. The engine first originated in England, so the concept also derives from English, with its original meaning referring to 'a mechanical device that generates power'.