What is the difference between VCU and ECU?
1 Answers
VCU and ECU have the following differences: 1. VCU: The VCU is the core electronic control unit that implements vehicle control decisions. It is generally only equipped in new energy vehicles, while traditional fuel vehicles do not require this device. The VCU determines the driver's driving intention by collecting signals from the accelerator pedal, gear, brake pedal, etc. By monitoring vehicle status (such as speed, temperature, etc.), the VCU processes this information and sends control commands for the vehicle's operating state to the powertrain and battery system, while also controlling the working mode of the on-board auxiliary power system. The VCU has functions for diagnosing, protecting, and storing faults in the entire vehicle system. 2. ECU: The ECU controls the fuel mixture (air-fuel ratio) and spark timing (ignition advance and duration) based on feedback from sensors connected to the engine. The control of fuel mixture and spark timing is quite complex. The ECU needs to gather data from multiple sensors to achieve optimal system control. The ECU must monitor ground speed, engine speed, crankshaft position, air quality (oxygen content), engine temperature, engine load (such as when the air conditioning (A/C) is on), throttle position, throttle change rate, transmission gear, exhaust emissions, and more.
