Method for controlling the operation of the fuel injector in a fuel injection type internal combustion engine during a deceleration condition of the engine

Claim 1

Method for operating a fuel injector device in a computer controlled fuel injection type internal combustion engine during a fully closed position of throttle valve of the engine in which idling engine speed is controlled so that it is maintained to N F , said method comprising the steps of: (a) storing, in a memory unit of the electrical computer, a value corresponding to a first rotational speed N 1 ; (b) storing, in the memory unit, a value corresponding to a second rotational speed N 2 which is smaller than N 1 and is larger than the idling rotational speed N F ; (c) storing, in the memory unit, a value corresponding to an increase α in the first rotational speed N 1 ; (d) storing, in the memory unit, data corresponding to an increase β in the second rotational speed of the engine N 2 ; (e) detecting whether a predetermined period has lapsed or not from the start of the engine; (f) producing an electrical signal for stopping the operation of the fuel injector device when said period has not lapsed and when the rotational speed of the engine N is larger than N 1 plus α; (g) producing an electrical signal for operating the fuel injector device when said period has not lapsed and when the rotational speed of the engine N is smaller than N 2 plus β; (h) producing the electrical signal for stopping the operation of the fuel injector when the period has lapsed and when the rotational speed of the engine N is larger than N 1 ; (i) producing the electrical signal for operating the fuel injector when the period has lapsed and when the rotational speed of the engine N is smaller than N 2 ; (j) repeating the above mentioned steps during fully closed position of the throttle valve of the engine.