VEHICULAR VENTILATOR

PROBLEM TO BE SOLVED: To adjust air supply-exhaust quantity by the flow rate difference by measuring an air supply flow rate and an air exhaust flow rate having smaller fluctuation compared to a change in a car inside pressure measured value and to reduce an excessive load to a car inside air conditioner by maintaining a car inside environment in a comfortable state by restraining a car inside pressure change while securing a required ventilating quantity by restraining the excessive introduction of outside air.

SOLUTION: This ventilator of a high speed vehicle is provided with means 2b, 3b and a controller 4a for measuring the air supply flow rate and the air exhaust flow rate to estimate an air supply-exhaust flow rate difference to control opening of an air supply flow regulating valve 2a and an air exhaust flow regulating valve 3a so that the air supply-exhaust flow rate difference becomes within a preset air supply-exhaust flow rate difference. When controlling both the air supply flow regulating valve and the air exhaust flow regulating valve on condition of being closed, a means or a timer is arranged for detecting car inside-outside pressure difference. When the car inside-outside pressure difference become within a preset value capable of air supply and exhaust or after a preset time passes from air supply-exhaust valve closing time, the air supply flow regulating valve and the air exhaust flow regulating valve are controlled so as to open.