Freewheeling controller and ignition system

The invention provides a freewheeling controller and an ignition system. The ignition system comprises an electronic controller, ignition coils and the freewheeling controller. According to the freewheeling controller and the ignition system, the freewheeling controller analyzes the magnitude of the required discharge current and the required discharge current time of the secondary ignition coil according to an ignition control signal sent by the electronic controller, and the magnitude of the discharge current of the secondary ignition coil is controlled by controlling the follow current to flow to the primary ignition coil, so that the actual discharge duration time of the secondary ignition coil is consistent with the required discharge duration time; and/or the magnitude of the actualdischarge current of the secondary ignition coil and the magnitude of the required discharge current are protected to be consistent, so that continuous ignition of an engine is realized, electric energy waste caused by too sm