ECU and ECM are commonly used electronic control units in intelligent vehicles. ECU stands for Electronic Control Unit, which is a processor that accepts input signals, calculates them, and outputs control signals to control the output of the engine. ECU is responsible for managing specific vehicle systems or subsystems, such as the engine, braking system, suspension system, etc. ECM is a part of ECU and mainly used to monitor and control the operation of the engine, manage systems such as fuel injection, ignition, emission control, etc. ECM also includes the collection of various sensor signals and feeds them back to ECU as feedback signals for closed-loop control, to ensure that the vehicle works in the best possible state under various working conditions. ECU and ECM are used to ensure that the vehicle works in the best possible state under various working conditions, while improving the safety, comfort, and fuel efficiency of the vehicle.