The invention discloses a secondary ignition circuit and method based on HCS08SG. The secondary ignition circuit comprises a power supply
processing module, a
signal processing module, an IGBT (Insulated Gate Bipolar Translator) driving module, a sampling module and an HCS08SG
single chip microcomputer, wherein the power supply
processing module is used for supplying power to the whole circuit; the
signal processing module is connected between the ECU and the HCS08SG single-
chip microcomputer and used for collecting ECU signals, processing the ECU signals and outputting the ECU signals to the HCS08SG single-
chip microcomputer; the IGBT driving module is connected between the HCS08SG
single chip microcomputer and an IGBT and is used for driving the IGBT to carry out first ignition and second ignition according to the
control signal of the HCS08SG
single chip microcomputer; the sampling module is connected between the HCS08SG single
chip microcomputer and the IGBT and is used for detecting the primary current flowing through the IGBT and feeding back the detected current information to the HCS08SG single chip microcomputer; the HCS08SG single chip microcomputer is used for outputting a
control signal to control the IGBT driving module to drive the IGBT to perform first ignition; after the first ignition, the HCS08SG single-chip microcomputer performs sampling detection at the emitting
electrode of the IGBT through the sampling module; when it is detected that the primary current of the IGBT is reduced, the HCS08SG single-chip microcomputer delays for a certain time and then outputs a
control signal to control the IGBT driving module to drive the IGBT to conduct secondary ignition. According to the invention, the
ignition coil can perform secondary ignition, so that the
ignition coil can still provide relatively
high energy at a low rotating speed,
fuel oil is combusted more sufficiently, the
fuel oil combustion rate and ignition energy are improved, better power is provided, the ignition stability of an engine is maintained, and the
oil consumption and emission performance of the engine are improved.