Because according to the working sequence (ignition sequence) of the engine, the low-voltage DC is boosted to a sufficiently high voltage. Through the spark plugs of each cylinder, the compressed combustible mixture with high temperature and high pressure is ignited to complete the working process.

ECU is an electronic control unit, also known as "trip computer" and "vehicle computer". Like an ordinary computer, it consists of a microcontroller (MCU), a memory (ROM, RAM), an input/output interface (I/O), an analog-to-digital converter (A/D) and a large-scale integrated circuit such as shaping and driving.

Like an ordinary computer, it consists of a microcontroller (MCU), a memory (ROM, RAM), an input/output interface (I/O), an analog-to-digital converter (A/D) and a large-scale integrated circuit such as shaping and driving. To put it simply, ECU is the brain of a car.