This paper proposes a new technique on Variable Capacity Control(VCC) of compressor for Automotive Air-Conditioning System(AACS). It is based on Reference Model Following Based Sliding Mode Controller (RMFSMC) with disturbance observer. Today, VCC for AACS is widely attracted from the point of view of saving energy and keeping inside of a car comfortable. However, it is difficult to control AACS with VCC, since AACS has a complex and non-linear characteristic. To fix the problem, the mathematical model was derived from the system identification result and RMFSMC with disturbance observer has been designed. This paper describes some techniques to realize its development process, and the simulation and experimental results are shown.
