Unreasonable oil consumption real-time alarm method and OBD vehicle-mounted terminal thereof

The invention discloses an unreasonable oil consumption real-time alarm method and an OBD vehicle-mounted terminal thereof, and belongs to the technical field of vehicle electronics. Whether the vehicle has unreasonable fuel consumption and fuel consumption reasons in the driving process or not is scientifically judged through real-time data such as the accelerator opening degree, the vehicle speed and the engine rotating speed according to the running principle of the diesel vehicle; and a driver is reminded through voices. The OBD vehicle-mounted terminal comprises a first CAN bus unit, a second CAN bus unit, a single-chip microcomputer including an unreasonable oil consumption real-time alarm program, a storage unit and an alarm prompt unit. And driving parameters are received from theOBD system of the diesel vehicle and transmitted to the single chip microcomputer, whether unreasonable oil consumption exists in the driving process or not is judged in real time, and the oil consumption per hundred kilometers is calculated. Besides, the single-chip microcomputer calls the corresponding voice file from the storage unit and informs the driver of the corresponding voice file through the alarm prompt unit to prompt the driver to change the driving behavior, and unreasonable oil consumption is avoided.