Off-line time detection method and system based on vehicle expected speed and medium

The invention relates to an off-line time detection method and system based on the expected speed of a vehicle and a medium, and the method comprises the steps: U1, obtaining the driving acceleration of the vehicle and the course angle data information of the vehicle in real time based on a vehicle-mounted IMU, and obtaining the position data information of the vehicle in real time based on a vehicle-mounted GPS; and U2, on the basis of the position data information of the vehicle, the driving acceleration of the vehicle and the course angle data information of the vehicle, calculating the expected values of the vehicle speeds at different moments and positions by adopting a multivariable vehicle expected speed algorithm to obtain expected speed data information of the vehicle at different moments and positions. The off-line time of the vehicle can be accurately detected, the detection process is suitable for various complex environments, the application range is wide, and application and popularization are f