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Compressor refrigerant temperature and refrigerant lack detection method and air conditioner
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A technology for compressors and air conditioners, which is applied in heating methods, mechanical equipment, lighting and heating equipment, etc. It can solve the problems that the heat of the stator coil of the compressor is difficult to transfer to the exhaust detection position, the production process is complicated, and it is easy to misjudge. , to achieve the effect of eliminating easy failure, simple production process and high reliability
Active Publication Date: 2021-11-02
HISENSE (GUANGDONG) AIR CONDITIONER
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Problems solved by technology
The acquisition solution is complicated to install and the production process is complicated, and the sensor is prone to failure under high temperature and high humidity
[0003] In addition, for the existing scheme that collects the compressor exhaust temperature and applies it to judge the lack of refrigerant or leakage of refrigerant, because when there is no refrigerant, the heat of the stator coil of the compressor is difficult to transfer to the exhaust detection position, and the exhaust cannot identify whether there is a lack of refrigerant. Refrigerant, but through the detection of superheat and subcooling under different working conditions, different models, corresponding parameters are different, the rules are complicated, and it is easy to misjudge
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Embodiment 1
[0035] Such as figure 1 Shown, a kind of refrigerant temperature detection method of compressor, it comprises:
[0036] S1. Obtain the three-phase current of the compressor at the current moment, and calculate and obtain the estimated resistance value of the stator coil of the compressor according to the three-phase current. Specifically:
[0037] The estimated resistance value of the stator coils of the compressor is calculated according to the following differential equation:
[0038] d s ' / dt=(iα'*iα+iβ'*iβ) / L s ;
[0039] Wherein, the iα', iβ' are estimated values on the αβ coordinate system through the Clarke transformation of the three-phase current; L s is the coil inductance of the stator coil.
[0040] Preferably, the estimated resistance value is a resistance value obtained after filtering out high-frequency noise by a low-pass filter.
[0041] S2. Obtain the refrigerant temperature at the current moment according to the estimated resistance value and the re...
Embodiment 2
[0054] Such as figure 2 As shown, a refrigerant leakage detection method for a compressor includes:
[0055] S1. Obtain the three-phase current of the compressor at the current moment, and calculate and obtain the estimated resistance value of the stator coil of the compressor according to the three-phase current. Specifically:
[0056] The estimated resistance value of the stator coils of the compressor is calculated according to the following differential equation:
[0057] d s ' / dt=(iα'*iα+iβ'*iβ) / L s ;
[0058] Wherein, the iα', iβ' are estimated values on the αβ coordinate system through the Clarke transformation of the three-phase current; L s is the coil inductance of the stator coil.
[0059] Preferably, the estimated resistance value is a resistance value obtained after filtering out high-frequency noise by a low-pass filter.
[0060] S2. Obtain the refrigerant temperature at the current moment according to the estimated resistance value and the reference re...
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Abstract
The invention discloses a method for detecting refrigerant temperature and refrigerant shortage of a compressor and an air conditioner. The three-phase current of the compressor at the current moment is obtained, and the estimated resistance value of the stator coil of the compressor is calculated according to the three-phase current; according to the estimated The resistance value and the reference resistance value of the stator coil are used to obtain the refrigerant temperature at the current moment; within the preset time interval, the first refrigerant temperature at the initial moment and the second refrigerant temperature at the final moment are calculated according to the above steps; according to the first refrigerant temperature and the rate of change of the temperature of the second refrigerant to determine whether the refrigerant of the compressor leaks. Therefore, the present invention can replace the existing sensor detection method, without installing any sensor and corresponding hardware circuit in the production process, eliminating the problem that the sensor is prone to failure under high temperature and high humidity, and has simple production process, high reliability and low cost .
Description
technical field [0001] The invention relates to the technical field of air-conditioning control, in particular to a method for detecting refrigerant temperature and lack of refrigerant of a compressor and an air conditioner. Background technique [0002] Existing technical solution: The outdoor system of the inverter air conditioner needs to collect the exhaust temperature of the compressor. The collection solution currently uses traditional sensors, such as NTC thermistors, which are placed at the compressor exhaust port or exhaust pipeline. The wire connects the sensor to the circuit board, and the circuit board converts the voltage of the sensor into an analog signal. The signal is connected to the MCU, and the MCU performs AD conversion, and then calculates the corresponding temperature through software. The acquisition scheme is complicated to install and the production process is complicated, and the sensor is prone to failure under high temperature and high humidity. ...
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