Low-voltage sensor fault identification control method, device, and multi-connected air-conditioning system

Abstract

Embodiments of the present invention provide a low-voltage sensor fault identification control method, device, and multi-connected air-conditioning system, which relate to the technical field of air-conditioning. The method includes: when the compressors of the plurality of outdoor unit modules stop and stand still for a first preset time, acquiring the shutdown low pressure saturation temperature corresponding to the low pressure sensors of the plurality of outdoor unit modules. Preliminarily identify whether the low pressure sensor detects abnormality according to the low pressure saturation temperature at shutdown. If so, mark the outdoor unit module corresponding to the low-pressure sensor initially identified as detecting abnormality as an abnormal module. In the case of the heating operation for the second preset time, the low pressure saturation temperature corresponding to the low pressure sensors of the multiple outdoor unit modules, the exhaust temperature of the compressor, and the opening of the external unit expansion valve of the abnormal module are acquired. Based on the low-pressure saturation temperature, exhaust temperature and the opening of the expansion valve of the external unit, it is judged whether the low-pressure sensor of the abnormal module has detected an abnormality. This method can effectively identify the fault of the low pressure sensor.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a low-pressure sensor fault identification control method, device and multi-connected air conditioning system. Background technique [0002] The multi-connected air-conditioning system will have more temperature sensors. These sensors are the core input parameters of the multi-connected air-conditioning system. When the sensors are abnormal or damaged, the normal operation of the air conditioner will be affected. Especially the low pressure sensor is the core of the multi-connected air conditioning system. However, it is difficult to identify faults of low-voltage sensors in related technologies at present. Therefore, how to identify sensor faults and perform adaptive control without affecting user use is worth studying. Contents of the invention [0003] The problem solved by the invention is the technical problem that the low pressure sensor is difficult to identify...

AI Technical Summary

Problems solved by technology

However, at present, low-voltage sensors in related technologies are difficult to identify faults. Therefore, how to identify sensor faults and perform adaptive control without affecting user use is worth studying.

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