Solenoid valve state monitoring circuit, monitoring method and monitoring system

The invention relates to an electromagnetic valve state monitoring circuit, monitoring method and monitoring system, and belongs to the technical field of electromagnetic valves. The input end of the first voltage dividing module is connected with the first output end of the energy charging module; an emitter of the first switch tube N1 is grounded, and a base is externally connected with a controller; the electromagnetic valve interface is connected in parallel with a diode D1, one end is connected with the input end of the first voltage division module, and the other end is connected with the collector of the first switching tube N1; the input end of the second voltage dividing module is connected with the collector of the first switching tube N1, and the output end is grounded; the solenoid valve state detection circuit comprises a comparator U1A, the non-inverting input end of the comparator U1A is connected with the first voltage dividing module, and the inverting input end of the comparator U1A is conne