CAN bus-based distributed control system for controlled atmosphere fresh-keeping transport vehicle and realization method thereof

The invention discloses a CAN bus-based distributed control system for a controlled atmosphere fresh-keeping transport vehicle and the realization method thereof. The control system comprises a main controller node and communication nodes, wherein the main controller node comprises an ARM control panel with a CAN communication port and a touch screen, the main controller node is installed on the instrument panel in the cab of the controlled atmosphere fresh-keeping transport vehicle, the communication nodes comprise a pressure chamber node, a vehicle head node, a negative pressure chamber node and a fresh-keeping chamber node, and the main controller node communicates with the communication nodes through CAN buses. The communication medium employs bi-core leads with shielding net. Four communication nodes of the pressure chamber node, the vehicle head node, the negative pressure chamber node and the fresh-keeping chamber node and the main control node are employed, and communication among all nodes is carried out through CAN buses. The working stability of the system is improved. The control system has fault diagnosis function, acquires the sensor parameter scope and performer working current of the communication nodes on a real-time basis, and determines the working state of devices after calculation and analysis.