Air-fuel mixture control device of engine

An air-fuel mixture control system for controlling a mixture of air and fuel to be supplied to a combustion chamber of an engine, the system including:

• a throttle body including an intake passage communicated to the combustion chamber and a throttle valve provided in the intake passage;
• a fuel injection valve for injecting the fuel into the intake passage;
• a fuel supplying device for supplying the fuel under pressure to the fuel injection valve;
• and
• an electronic control unit for controlling an injection quantity of the fuel to be injected from the fuel injection valve,
• the throttle body, the fuel injection valve, the fuel supplying device, and the electronic control unit being united, forming an assembly;
• a memory for storing a correction value with respect to dispersion related to the fuel injection quantity determined by a preliminary test on an assembly-by-assembly basis, the memory being provided in the electronic control unit;
• and
• the electronic control unit being operated to correct the fuel injection quantity based on the correction value stored in the memory for control of the fuel injection quantity.