Device and method for controlling timing at which ignition is stopped when internal combustion engine becomes stopped

A method for controlling stopping of an internal combustion engine including a throttle valve that controls an intake air amount of the internal combustion engine, an actuator that drives the throttle valve, a revolving speed sensor that detects a revolving speed of the internal combustion engine, and an electronic control unit that controls the internal combustion engine, the electronic control unit performing the steps of:

• stopping control of fuel injection valves with a command for stopping the internal combustion engine;
• continuing ignition control of ignition plugs after the control of the fuel injection valves is stopped;
• transmitting signals to the actuator for opening the throttle valve to control a stopping position of a piston after the command for stopping the engine is transmitted and when the revolving speed of the internal combustion engine becomes lower than a predetermined revolving speed;
• stopping ignition of ignition plugs when the throttle valve is opened in order to control the piston stopping position;
• determining an advance angle amount of ignition timing by feedback control such that the revolving speed of the internal combustion engine becomes a target revolving speed;
• and
• determining a retard angle amount of the ignition timing according to a pressure in an intake pipe;
• wherein the step of stopping ignition stops the ignition in response to the ignition timing being retarded by the retard angle amount due to an increase of the pressure in the intake pipe resulted from the throttle valve being opened to control a piston stopping position, after the ignition timing is advanced by the advance angle amount.