FIELD: engines and pumps.
SUBSTANCE: electronic control unit (ECU) (40) provides the ignition signal Si to the ignition device (30) via the ignition transmission line (Li) and outputs the discharge pulse shape control signal Sc with logic value H through the pulse shape control signal transmission line (Lc). The ignition device (30) performs the operation of closing the ignition switch (60) in the time interval during which the ignition signal Si is output. In the time interval for inputting the discharge pulse shape control signal Sc after stopping the input of the ignition signal Si, the ignition device (30) controls the electric current, flowing through the primary winding (52) by the opening-closing operation of the control switching element (80). When the voltage of the pulse shape control signal transmission line Lc is logical value of H in the time interval for stopping the supply of the discharge pulse shape control signal Sc, the ECU (40) determines that the pulse shape control signal transmission line (Lc) is faulty and performs the fault-tolerant process.
EFFECT: detection of a fault in the transmission line of the pulse shape control signal, which transmits the control signal of the discharge pulse form.
4 cl, 12 dwg
