Sensor detachment determination and expansion valve control method, device and air conditioner

Abstract

The present invention provides a method, device and an air conditioner for judging sensor dropout and expansion valve control, and an air conditioner. The control method includes: heating the air conditioner, detecting and calculating a first temperature difference ΔT 1 , ΔT 1 =T 外盘 ‑T 外环 , and according to ΔT 1 Preliminarily determine whether the operating state of the exhaust gas temperature sensor is normal or abnormal, and when the preliminary determination result is that the operating state of the exhaust gas temperature sensor is abnormal, detect and calculate the second temperature difference ΔT 2 , ΔT 2 =T 内盘 ‑T 排气 , and according to ΔT 2 The second judgment is that the exhaust gas temperature sensor is operating normally or abnormally. When the second judgment result is that the exhaust gas temperature sensor is abnormal, the 2 Adjust the opening of the expansion valve and / or determine whether the exhaust gas temperature sensor falls off. The invention determines whether the exhaust temperature sensor falls off through the second judgment, which improves the judgment accuracy, and plays a certain protective role on the compressor through the adjustment of the opening degree of the expansion valve, so as to prevent the compressor from being worn or burned in a long-term high temperature state. , to improve the safety of the use of air conditioners.

Description

technical field [0001] The present invention relates to the field of air conditioners, and in particular, to a method and device for judging sensor dropout and controlling an expansion valve, and an air conditioner. Background technique [0002] At present, in the air conditioner system, the expansion valve generally uses the exhaust temperature collected by the outdoor unit exhaust temperature sensor for linkage control. When the exhaust temperature sensor falls off or is not fixed firmly, the actual exhaust temperature detected during heating operation is usually It will be lower than the target discharge temperature, causing the system to adjust the expansion valve to make the expansion valve valve step smaller, until it is adjusted to the minimum valve step for operation, which will cause the actual discharge temperature of the compressor to be too high, and at this time the expansion valve The control is in a state of failure, and long-term operation will cause the comp...

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Problems solved by technology

[0002] At present, in the air conditioner system, the expansion valve generally adopts the exhaust temperature collected by the exhaust temperature sensor of the outdoor unit for linkage control. When the exhaust temperature sensor falls off or is not fixed firmly, the actual exhaust temperature detected during heating operation is usually will be lower than the target discharge temperature, causing the system to adjust the expansion valve so that the valve step of the expansion valve becomes smaller until it is adjusted to the minimum valve step for operation, which will cause the actual discharge temperature of the compressor to be too high. The control is in an invalid state, and long-term operation will cause wear and tear of the compressor or even burn it out

[0003] In the prior art, there are many methods for judging the exhaust gas temperature sensor falling off, such as pipe temperature, ambient temperature, etc., but after it is judged to be falling off, the control method of shutting down is usually adopted. Because the existing judgment method is not accurate, it often fails false positive shutdown

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