System for controlling fuel injection for multiple-displacement engines

A system for controlling fuel injection for a multiple-displacement engine having cylinders and a respective solenoid-operated fuel injection valve for each cylinder, a throttle plate in an intake manifold communicating with the cylinders, a depressable accelerator pedal operatively connected to the throttle plate, and an electronic control unit, comprising:

• switch means for rendering each solenoid-operated fuel injection valve respectively inoperative;
• said accelerator pedal being arranged to be further depressed after a full throttle plate open position;
• a throttle plate position sensor for producing an output signal in proportion to the throttle plate position;
• an accelerator pedal position sensor for producing an output signal dependent on the accelerator pedal position;
• a fuel injection control circuit responsive to said output signals of said throttle plate position sensor and said accelerator pedal position sensor for operating said switch means to cut off fuel to a corresponding of said cylinders, respectively;
• said fuel injection control circuit being arranged to cut off the fuel to respective of said cylinders via corresponding of said switch means in accordance with idle cylinder patterns which are such that particular cylinders are not repeatedly idled, and such that the number of idling cylinders by the fuel cut-off is dependent on said output signals and progressively decreases with an increase of the depression degree of the accelerator pedal after the full throttle plate open position.