| 摘要 |
This application discloses a high-energy ignition coil, wherein a primary coil and a secondary coil are both wound around an iron core, these three constituting a transformer. The primary coil loop is provided with a switch controlled by an ECU. The spark plug is connected at one electrode to an end of the secondary coil, and is grounded at the other electrode. An on-board power supply supplies power to the primary coil via a DC booster, which boosts the DC voltage outputted by the on-board power supply before outputting. The other end of the secondary coil is either connected to the DC booster or grounded via a reversely connected diode. A current keeping device is connected in parallel with a serial branch of the secondary coil and the spark plug, working after the spark plug is turned on to keep the spark plug on. The ignition coil of this application can regulate the on-time of the spark plug arbitrarily, and can thus increase the ignition energy; besides, in the ignition coil of this application a higher voltage is used to turn on the primary coil, thus improving the energy conversion efficiency. |
