Patent ID: 7243638

Claim:
A fuel injection control method, comprising the steps of: providing an electronic type control apparatus; using an ignition coil generating an ignition voltage operating an ignition plug in synchronous with an engine rotation, a pressure sensor detecting an intake pipe pressure, and said electronic type control apparatus to which an ignition signal corresponding to a primary voltage generated in said ignition coil and a pressure signal corresponding to an intake pipe pressure detected by said pressure sensor are input and which outputs an ignition signal to a fuel injection valve, wherein said electronic type control apparatus checks out by using said ignition signal and the pressure signal first that a state in which the intake pipe pressure is lowered exists within a certain ignition signal cycle, and second that the state in which the intake pipe pressure is lowered does not exist within the next injection signal cycle, determines that an ignition signal generating time point of said second ignition signal cycle start is a terminal phase of a compression stroke and an end ignition signal generating time point is a terminal phase of an exhaust stroke at a time when said first and second confirmations are executed, and decides an injection timing on the basis of said determination.