Patent 10273628 was granted and assigned to LG on April, 2019 by the United States Patent and Trademark Office.
Disclosed is a control method for a laundry drying machine. The control method includes driving a compressor configuring the heat pump cycle for generation of heated air, sensing a compressor outlet temperature (TE) and a drum outlet temperature (TD), and determining plugging of a filter, based on a difference between the compressor outlet temperature (TE) and the drum outlet temperature (TD).