When the leaf sign on the dashboard lights up, the intelligent green energy-saving auxiliary system is turned on, commonly known as energy-saving mode. As long as the owner turns on the ECON energy-saving mode switch, the vehicle will automatically enter the priority fuel consumption control mode, and the system will actively avoid the high energy consumption caused by the driver's excessive acceleration and deep stepping on the accelerator to realize intelligent fuel saving. The working principle of energy-saving mode is to analyze the configuration that can affect fuel consumption, such as gearbox, engine speed, braking system, gearbox oil temperature, etc. Through various sensors, the ECU calculates the optimal fuel quantity, which provides work for the engine and effectively reduces the fuel consumption compared with the ordinary driving mode.