How does the ECU (Electronic valve control) work?

How does the ECU work? Simply it like a general command process: “thinking”, “command” and finally “confirm”

“Reconnaissance” isbeen finished by the sensor, the sensor is responsible for the entire engine “reconnaissance”, in an engine,there are many sensors, big or small. Throttle position sensor, crankshaft speed sensor, oxygen sensor, crankshaft position sensor, camshaft position sensor, intake air temperature sensor, water temperature sensor, knock sensor, they are the basic sensors in a car engine. Sensors are everywhere, they are responsible for collecting relevant information, and make them in a form of electrical signals transfer to the ECU, through the analog-digital converter A / D into a digital signal, through the operation the ECU can determine the working state of the engine, This is the ECU “thinking” process.