The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 2022
Filed:
Jan. 28, 2019
Qingdao Haier Air-conditioning Electronic Co., Ltd., Qingdao, CN;
Haier Smart Home Co., Ltd., Qingdao, CN;
Defang Guo, Qingdao, CN;
Baitian Zhuo, Qingdao, CN;
Bin Shi, Qingdao, CN;
Shaojiang Cheng, Qingdao, CN;
Ruigang Zhang, Qingdao, CN;
Jun Wang, Qingdao, CN;
QINGDAO HAIER AIR-CONDITIONING ELECTRONIC CO., LTD., Qingdao, CN;
HAIER SMART HOME CO., LTD., Qingdao, CN;
Abstract
An oil return control method for a multi-split air conditioner and a system accomplishing the same includes: calculating an average exhaust pressure within an oil return period Pd_AVG; determining whether the average exhaust pressure Pd_AVG≥the set threshold Pd; if Pd_AVG≥Pd, maintaining the multi-split air conditioner working in heating mode to ensure an acceptable oil return performance without affecting the air conditioning effect of indoor unit in heating mode; if Pd_AVG<Pd, switching the multi-split air conditioner to cooling mode, stopping a fan within those power-on indoor units and entering into a cooling oil return process and switching the multi-split air conditioner back to heating mode until the cooling oil return process ends.