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A Basic Study on Control Algorithm for Car HVAC  

Shin, Young-Gy (Department of Mechanical Engineering, Sejong University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.22, no.5, 2010 , pp. 275-281 More about this Journal
Abstract
Car HVAC is one of main factors influencing a potential customer's first impression. It should be fault-free, which requires the most stable control performance. So, the control algorithm consists of a proportional feedback only, not with an integral action needed for elimination of steady-state errors. To reduce the errors and make the response faster, feedforward algorithm based on predicted thermal load is added. To evaluate the performance, car HVAC is dynamically modelled and its control logic is simulated. The results shows that the proportional feedback leads to about $4^{\circ}C$ of steady-state error. When the feedback is combined with the feedforward algorithm and with a set value update based on disturbances, it predicts less than $1^{\circ}C$ of control error and improved thermal comfort.
Keywords
Dynamic model; HVAC control; Car; Feedforward; Steady-state error;
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  • Reference
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