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Air conditioning is defined as the process of treating air so as to control simultaneously its temperature, humidity, cleanliness and distribution to meet the requirements of the conditioned space. As in the definition, the important actions involved in the operation of an air conditioning system are temperature and humidity control, air purification and movement. For these conditions this paper proposes a Automatic Climate Control(ACC) system of the bus. The system has cooling, heating, and dehumidifying modes, and is governed by dual 8-bit microprocessors. These modes are broken down into sub-modules dealing with control of the compressor, blower speed, damper position, air purifier, ventilators, preheater, air mixing damper and so on.

In efforts to prevent airflow noise and conserve heated and/or cooled air, express bus design has favored fixed windows, double glasses and closed structures with lower rates of ventilation. However, because there are many passengers in an express bus at the same time, offensive odor, carbon dioxide and other contaminants may accumulate in the bus's indoor. If sufficient amounts of ambient air are not brought into or distributed throughout the passenger compartment of the bus, in-bus air problems may result. An air ventilating system of the express bus that is properly designed, and that has a good performance of natural ventilation, can promote the air quality of the passenger compartment and the comfort of passengers. In order to design an effective ventilating system of the express buses, some design factors such as air inlet/outlet positions, air distribution, proportion of ambient air, and airflow control are considered computationally and experimentally in this work.