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In this paper, we deal with the automatic climate control for Recreational Vehicle (RV). The HVAC system used for RV was composed of front side and rear side. And, the HVAC system of front side differed from that of rear side in the characteristic of HVAC system. This system was economically optimized for automatic control over 2 separated zones. The development procedure of automatic climate controller was as follows. The first stage was to derive control equation from characteristic analysis of HVAC system and the structural characteristic of vehicle interior. In the second stage, the software (S/W) was designed and programmed to operate microprocessor which calculated previously mentioned equation. Finally, the hardware (H/W) design and building were performed to operate the HVAC system with the calculation results from microprocessor. The control performance of this automatic climate control algorithm and system was evaluated by experimental method.

This paper is consists of two parts, which describe the development procedure of climate control algorithm for a passenger car. The first part deals with the control algorithm design, and the second part introduces control performance test. Control algorithm is evaluated through thermal balance equation of vehicle compartment. The procedure of this evaluation is verified by showing test result. In vehicle test, the remote controller, a real-time experimental system for climate control, is used. The software of remote controller is programmed by Visual C++ operating on WIN95 and the hardware is similar to a real electronic control unit of HVAC. Remote controller predicts control efficiency of HVAC system. The goal of this paper is to get the standard model of development procedure. It would contribute cost reduction and rapid development of climate control algorithm for a passenger car.