ECU data flashing method, device and system

The invention discloses an ECU data flashing method, device and system, which can ensure that an industrial personal computer correctly sends out programming data of each CAN channel without being interrupted by programming data of other CAN channels by adding a CAN network number in a data packet and using a plurality of CAN channels in a vehicle communication interface, and correctly distinguish which CAN channel the received data belongs to. In addition, a VCI can accurately forward the programming data sent by the industrial personal computer to the corresponding ECU, and return the response data of the corresponding ECU accurately to the industrial personal computer without confusing the data of each CAN channel. Through the process, multiple pieces of network data can be ensured to be transmitted on the bus for communication between the industrial personal computer and the VCI at the same time, and therefore the data flashing efficiency is improved while the cost is ensured. 本发明公开了一种ECU数据刷写方法、装置以及系统，通过在