Multi-mode OTA full-quantity upgrading method and system

The invention belongs to the technical field of OTA upgrading, and particularly relates to a multi-mode OTA full-quantity upgrading method and system. In order to solve the problems that OTA upgrading is incompatible and the safety is reduced due to the fact that all types of vehicle-mounted controllers of a commercial vehicle are upgraded by adopting the same OTA upgrading mode, preliminary judgment is performed by comparing the size of an upgrading package, further judgment is performed by combining the function importance degree of a vehicle-mounted control unit to be upgraded of the commercial vehicle and hardware storage resources, and the OTA upgrading is completed. A proper upgrading mode is selected to be compatible with different controllers, reliable OTA upgrading of the vehicle-mounted controller is guaranteed, remote vehicle problem repairing or new function pushing to market vehicles is further achieved, and continuous optimization of power economy, safety and the like of the whole life cycle of