Multi-stage control device of discharge air volume of bus air conditioner

摘要

The present invention relates to a multi-stage control device for the discharge air volume of the air conditioner for the bus, comprising: a power supply unit for supplying power generated through a vehicle generator to the system; A voltage divider for dividing the voltage power supply to have a predetermined voltage; A key panel portion for inputting a predetermined number of stages for obtaining a desired discharge air volume; A controller unit for driving and controlling the system by generating a control signal corresponding to the discharge air volume according to the corresponding button when a predetermined number of stages is input; A blower motor driving relay that performs on / off switching operation, and a relay controlling a moto by opening or closing a circuit and a blower motor.The blower motor is connected in series circuit only at the lowest stage and in parallel circuit at the highest stage, and between the highest stage and the lowest stage. In the stage, a series circuit and a parallel circuit are connected to each other, and an evaporator unit which blows the cooled air to the room by varying the rotational speed of the blower motor is made uniform, and the life of the blower motor is uniform, and the difference in air volume is reduced.