Patent ID: 7827959

Claim:
An ignition device for a spark ignition type internal combustion engine that directs ignition with generation of a predetermined start signal, the ignition device comprising: a timing determination means for determining whether the start signal is generated at predetermined start timing; and a prohibition means for prohibiting ignition based on the start signal when the timing determination means determines that the start signal is not generated at the predetermined start timing, wherein the predetermined start timing is set as a predetermined time elapsed after generation of a predetermined reference signal, the timing determination means determines whether the start signal is generated at the predetermined start timing based on elapsed time from generation of the predetermined reference signal to generation of the start signal, and the timing determination means starts charging of a time measuring capacitor when the reference signal is generated and determines whether the start signal is generated at the predetermined start timing based on whether the time measuring capacitor charge exceeds a permissible level before the start signal is generated.