RAINFALL DETERMINATION DEVICE, AIR VOLUME CALCULATION DEVICE AND ATTACHMENT DETERMINATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a rainfall determination device having higher determination accuracy than a conventional device.SOLUTION: A rainfall determination device comprises: pressure distribution sensors (1F, 1R and 1L) which detect a distribution of external pressure in a predetermined plane; and a circuit (5) which acquires a pressure distribution detected by the pressure distribution sensors and determines whether or not rain is falling on the basis of the acquired pressure distribution. The circuit: calculates a grade variation (DDP) which is a horizontal variation in the plane with respect to a vertical change gradient of the acquired pressure distribution in the plane; determines that rain is falling when the number of positions having the calculated grade variation equal to or larger than a threshold value in the plane is equal to or larger than a reference number; and determines that the rain is not falling when the number of the positions having the calculated grade variation equal to or larger than the threshold value is less than the reference number.