At present the air-conditioned train is one of the main tool for people to travel

and the air quality of trains directly affect the passengers’ health. Currently the main control objects of the air-conditioning system are temperature

humidity and CO2concentration

but it can not meet health and comfort level requirements for passengers. In order to control the air quality effectly

the air-conditioning system is composed of LPC2478 as controller and DSM501A as respirable particulate matter concentration monitoring sensor

on the basis of analysis on the train air-conditioning operation status. Experiments show that the air-conditioning system has good performance

high control precision

and it is significant on the improvement of environment

and has widespread application prospect.