Patent ID: 8973562
Filing Date: 2015-03-10
Classification: F02P

Abstract:
1. An ignition device for an internal combustion engine, comprising: an ignition plug including a first electrode and a second electrode opposed to each other via a predetermined gap, for generating in the predetermined gap a spark discharge for igniting a combustible mixture in a combustion chamber of the internal combustion engine; an ignition coil including a primary coil and a secondary coil, for generating a high voltage in the secondary coil by supplying or stopping a primary current flowing through the primary coil, and then applying the generated high voltage to the first electrode; and a control unit for driving the ignition coil for a plurality of times within a single ignition process, and changing a primary voltage for driving the ignition coil within the single ignition process, wherein the control unit comprises: wherein the ignition capacitor comprises: wherein a second side of the primary coil is connected to a node between the negative electrode side and the second switching element through the first switching element.