Patent ID: 8096276
Filing Date: 2012-01-17
Classification: F02D,F02P

Abstract:
1. A plasma ignition device, comprising: a plasma discharging spark plug; a spark coil that supplies a discharge voltage to the spark plug according to an ignition signal; and a plasma power supply circuit that is connected to the spark plug in parallel and supplies electric energy used to generate a plasma in a discharge space of the spark plug when a discharge of the spark plug starts, wherein the plasma power supply circuit includes: a DC/DC converter that is connected to a DC power supply and outputs a DC voltage; a voltage limit circuit that limits an output voltage of the DC/DC converter to a predetermined value; a PJ capacitor that is connected to an output end of the DC/DC converter and charged with the electric energy used to generate the plasma in the discharge space of the spark plug; and a high-voltage switch that is connected between the PJ capacitor and the DC/DC converter and controlled to switch ON and OFF so that a charge period of the PJ capacitor is controlled according to a running condition of an internal combustion engine.