RAIL TRANSIT VEHICLE AND VEHICLE DOOR STATE DETECTION CIRCUIT AND DETECTION METHOD THEREFOR

A vehicle door state detection method, comprising: determining activation states of a first power supply end and a second power supply end, determining an activated end, and starting from a non-activated end, collecting a state signal of a travel switch of a door of each carriage; if the state signal of the travel switch of the door of the first carriage is at a low level, determining that the door of the first carriage on this side is not secured; if the state signals of the travel switches of the doors of the first to ith carriages are all at a high level, and the state signals, which have been subjected to an AND operation, of the travel switches of the doors of the first to (i+1)th carriages are at a low level, determining that the door of the (i+1)th carriage on this side is not secured, wherein i = 2 to n-1; and if the state signals of the travel switches of the doors of the first to (n-1)th carriages are all at a high level, determining that the door of the nth carriage is not secured. By comprehensive