| 主权项 |
1. An ignition control device configured to control operation of a spark plug provided to ignite an air fuel mixture in a cylinder of an internal combustion engine, characterized in that the device comprises:
an ignition coil having a primary winding and a secondary winding and configured to generate a secondary current in the secondary winding connected to the spark plug by increasing/decreasing a primary current that is a current passing through the primary winding; a direct-current power supply having a non-grounded side output terminal connected to one end of the primary winding so that the primary current is passed through the primary winding; a first switching element that is a semiconductor switching element having a first control terminal, a first power supply side terminal, and a first grounded side terminal, the semiconductor switching element being configured to control turning on/off of a current across the first power supply side terminal and the first grounded side terminal on the basis of a first control signal inputted to the first control terminal, in which the first power supply side terminal is connected to another end of the primary winding and the first grounded side terminal is connected to ground; a second switching element that is a semiconductor switching element having a second control terminal, a second power supply side terminal, and a second grounded side terminal, the semiconductor switching element being configured to control turning on/off of a current across the second power supply side terminal and the second grounded side terminal on the basis of a second control signal inputted to the second control terminal, in which the second grounded side terminal is connected to another end of the primary winding; a third switching element that is a semiconductor switching element having a third control terminal, a third power supply side terminal, and a third grounded side terminal, the semiconductor switching element being configured to control turning on/off of a current across the third power supply side terminal and the third grounded side terminal on the basis of a third control signal inputted to the third control terminal, in which the third power supply side terminal is connected to the second power supply side terminal of the second switching element and the third grounded side terminal is connected to ground; an energy storage coil that is an inductor interposed in an electric power line connecting the non-grounded side output terminal of the direct-current power supply to the third power supply side terminal of the third switching element, in which the energy storage coil is provided to store energy by turning on the third switching element; a capacitor connected in series with the energy storage coil, being located at a position between the non-grounded side output terminal of the direct-current power supply and the ground, the capacitor being provided to store energy by turning off the third switching element; and a control unit provided to control the second switching element so that during ignition discharge at the spark plug started by turning off the first switching element, the second switching element is non-intermittently turned on to cause the capacitor to discharge stored energy for supplying the primary current from the another end to the primary winding, wherein during the ignition discharge, the control unit non-intermittently turns on the second switching element over an energy input time period. |
