Electronic control system

The invention provides an electronic control system. The electronic control system comprises an under-voltage identification unit, a power supply selection unit, a voltage detection unit, a micro-control unit and a switch unit. The electronic control system is powered by a first power supply and/or a second power supply. During power-on, if one power supply has an under-voltage fault, the under-voltage identification unit can send a voltage identification signal representing under-voltage to the power supply selection unit, and the power supply selection unit controls the switch unit to enablethe normal power supply to supply power so as to avoid the situation that the units cannot operate due to the under-voltage fault of the power supply; and after power-on, the voltage detection unit detects the voltages of the two power supplies, so that the micro-control unit can perform fault classification on the two power supplies and can output a power supply adjustment signal according to afault classification resul