Automatic Climate Control of the Recreation Vehicle with Dual HVAC System 2001-01-0591
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.
The automatic climate controller in this paper controlled front and rear side with 10 input variables and 11 output variables. This system was controlled by ‘Proportional Feed Forward Control Theory’. It was generally used in automatic climate control of vehicle. The basic control equation was induced from a thermal balance equation of the cabin interior. The control performance of this system has satisfied the conventional specifications.
The HVAC system installed in the rear side had an evaporator and a heater separately. Therefore, it had a big difference from normal ‘reheat air mixing system’. That was why the stability and climate control capacity of system were compared and optimized.
This paper should be a milestone the automatic climate control for RV and Multi-zones.