[0034] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with the embodiments of the present invention and the accompanying drawings.
[0035] The exhaust protection control method of the air conditioner of the present invention judges whether to activate the exhaust protection according to the exhaust temperature and the duration of the temperature; when the exhaust protection is activated, the opening degree of the electronic expansion valve is first activated to adjust, if the adjustment fails, then Turn on frequency reduction protection; if it still fails, turn on shutdown protection. So as to ensure the accuracy of judgment, improve the efficiency of the system and the service life of the compressor.
[0036] The exhaust protection control system of the air conditioner proposed by the present invention includes an initial value setting module, a detection module and a control module. Such as figure 1 , figure 2 As shown, the exhaust protection control method of the air conditioner proposed by the present invention includes the following steps:
[0037] Step S10: The setting module sets the exhaust temperature threshold T 0 And exhaust temperature duration threshold t 0;
[0038] Wherein, the exhaust temperature threshold T 0 Including: limited frequency temperature T 1 , Derating temperature T 2 , Shutdown protection temperature T 3 , And recoverable temperature T 4. That is, step S10 includes: setting the frequency limit temperature T 1 , Frequency reduction temperature T 2 , Shutdown protection temperature T 3 , And recoverable temperature T 4. Among them, shutdown protection temperature T 3Frequency reduction temperature T 2Limited frequency temperature T 1Recoverable temperature T 4 , And T 1 -T 45℃.
[0039] Step S11: Detect the discharge temperature T of the compressor exhaust And the temperature duration t;
[0040] In step S11, the exhaust gas temperature T is detected in real time by the temperature sensor at the exhaust end of the compressor exhaust.
[0041] Step S12: The exhaust temperature T will be detected exhaust And the exhaust temperature threshold T 0 Compare, and compare the duration t of the exhaust temperature with the time threshold t 0 Make comparisons and determine the compressor discharge protection mode based on the comparison results;
[0042] In the embodiment of the present invention, the exhaust protection mode includes an electronic expansion valve opening adjustment mode, a frequency reduction protection mode, and a shutdown protection mode.
[0043] Specifically, the electronic expansion valve opening mode is the frequency limiting mode, in which the exhaust gas temperature is opened when the temperature is between the frequency limiting temperature and the frequency reduction temperature, the compressor frequency is limited to the current frequency, and the electronic expansion valve is added Step count.
[0044] The frequency reduction mode is adjusted by reducing the compressor frequency. When the exhaust gas cannot be reduced to the frequency limit temperature through the frequency limit mode or the exhaust gas temperature directly rises above the frequency reduction temperature, the frequency reduction mode is activated. Reduce the press frequency to adjust.
[0045] The shutdown protection mode is the mode that is adjusted by turning off the compressor. When the two adjustment methods of the frequency limit mode and the frequency reduction mode still cannot reduce the exhaust temperature below the limit frequency temperature, the shutdown protection mode is turned on and the compressor is turned off Run to adjust.
[0046] In step S12, when the compressor discharge end temperature sensor detects T exhaust ≥T 4 +5, and the duration is greater than or equal to 5 seconds, the control system enters the frequency limit protection mode, adjusts the opening of the electronic expansion valve, the opening of the electronic expansion valve K 1 = Original opening K+5 steps, and limit the increase in compressor frequency, when the exhaust temperature T is detected exhaust ≤Recoverable temperature T 4 When the temperature, return to the original opening of the electronic valve K, otherwise, continue to adjust the opening of the electronic expansion valve, when the exhaust temperature is lower than T 4 At +5, the protection mode is released.
[0047] When the frequency limiting mode adjustment fails, and the compressor discharge end temperature sensor detects T 1 ≤T exhaust 2 , And the duration is greater than or equal to 5 seconds, no matter what mode the system is in, adjust the opening degree of the electronic expansion valve = the original opening degree K + 10 steps, when the compressor discharge end temperature sensor detects T exhaust ≤T 4 , And maintain this temperature for more than 3 seconds, then adjust the electronic expansion valve to return to the original opening K, at the same time the system limits the frequency to increase, and maintains the current frequency operation. If adjusting the opening degree of the electronic expansion valve = the original opening degree K+10 steps fail, and if T is still satisfied after 5 minutes 1 ≤T exhaust 2 , According to T 2 ≤T exhaust 3 The interval requires the frequency reduction mode to be reduced by 5 Hz, and the frequency is maintained for 2 minutes. If the exhaust gas temperature is detected to decrease after 2 minutes, and the decrease is large, the protection mode is released. If the exhaust temperature continues to rise after 2 minutes, and T 2 ≤T exhaust 3 , Then enter the next adjustment mode.
[0048] When T is detected 2 ≤T exhaust 3 , And the duration is greater than 3 seconds, no matter what mode the system is running in, the system will immediately reduce the frequency to 5Hz and keep the frequency for 2 minutes. When the frequency is reduced for 2 minutes:
[0049] a. If T is still satisfied 2 ≤T exhaust 3 , Then reduce the frequency by 5 Hz and maintain it for 2 minutes. At this time, it is still T 2 ≤T exhaust 3 , It will stop protection directly, when T is detected exhaust 2 When, the system exits the shutdown protection mode and restarts operation.
[0050] b. If T 4 ≤T exhaust 2 At the time, keep the frequency running for 30 minutes, and the subsequent system will recalculate the frequency operation according to the ability of the control logic.
[0051] c. If T exhaust 4 When the time is maintained for 3 minutes, the system re-runs according to the logical capacity calculation frequency.
[0052] At any time when the system is running, once T is detected for 3 consecutive seconds 3 ≤T exhaust , The system enters the shutdown protection mode directly, and displays "Exhaust High Temperature Protection" until T exhaust 4 It can be started only when it is time, otherwise the shutdown protection mode is maintained.
[0053] In the embodiment of the present invention, in the above various protection modes, if the output frequency calculated according to the capacity is lower than the current frequency, the output will be according to the actual frequency. Before the system starts, if the exhaust temperature T is detected exhaust ≥T 4 Then the system is not allowed to start, T exhaust Must be less than T 4 Before starting.
[0054] Such as image 3 As shown, the exhaust protection control system of the air conditioner proposed by the present invention includes: a control module, a detection module connected to the control module, and an initial value setting module module; wherein the initial value setting module is used to set the exhaust temperature threshold T 0 And exhaust temperature duration threshold t 0 , Wherein the exhaust temperature threshold T 0 Specifically include: limited frequency temperature T 1 , Frequency reduction temperature T 2 , Shutdown protection temperature T 3 , And recoverable temperature T 4 , And T 3T 2T 1T 4 , T 1 -T 4t Assume , Here t Assume Take 5°C; the detection module is used to detect the compressor discharge temperature T exhaust And the duration of the temperature t; the control module is used to detect the exhaust temperature T exhaust And the exhaust temperature threshold T 0 Compare and compare the duration t of the exhaust temperature with the time threshold t 0 Make comparisons and determine the compressor discharge protection mode based on the comparison results. The exhaust protection modes include an electronic expansion valve opening mode, a frequency reduction protection mode and a shutdown protection mode.
[0055] Wherein, the electronic expansion valve opening mode is the frequency limiting mode. In this mode, the exhaust gas temperature is opened when the temperature is between the frequency limiting temperature and the frequency reduction temperature. The compressor frequency is limited to the current frequency and the electronic expansion valve step is increased. number.
[0056] The frequency reduction mode is adjusted by reducing the compressor frequency. When the exhaust gas cannot be reduced to the frequency limit temperature through the frequency limit mode or the exhaust gas temperature directly rises above the frequency reduction temperature, the frequency reduction mode is activated. Reduce the press frequency to adjust.
[0057] The shutdown protection mode is the mode that is adjusted by turning off the compressor. When the two adjustment methods of the frequency limit mode and the frequency reduction mode still cannot reduce the exhaust gas temperature below the limit frequency temperature, the shutdown protection mode is turned on and the compressor is turned off Run to adjust.
[0058] In the embodiment of the present invention, the initial value setting module sets the frequency limit temperature T 1 , Frequency reduction temperature T 2 , Shutdown protection temperature T 3 , And recoverable temperature T 4. Among them, shutdown protection temperature T 3Frequency reduction temperature T 2Limited frequency temperature T 1Recoverable temperature T 4 , And T 1 -T 45℃. The detection module detects the exhaust temperature T through the temperature sensor at the exhaust end of the compressor exhaust.
[0059] When the compressor discharge end temperature sensor detects T exhaust ≥ T 4 +5 , And the duration is greater than or equal to 5 seconds, the control module controls to enter the frequency limit protection mode, adjust the opening of the electronic expansion valve, the opening of the electronic expansion valve K 1 = Original opening K+5 steps, and limit the increase in compressor frequency, when the exhaust temperature T is detected exhaust ≤Recoverable temperature T 4 When the temperature, return to the original opening of the electronic valve K, otherwise, continue to adjust the opening of the electronic expansion valve, when the exhaust temperature is lower than T 4 At +5, the protection mode is released.
[0060] When the frequency limiting mode adjustment fails, and the compressor discharge end temperature sensor detects T 1 ≤T exhaust 2 , When the duration is greater than or equal to 5 seconds, no matter what mode the system is in, the control module will adjust the opening degree of the electronic expansion valve = the original opening degree K + 10 steps, when the compressor discharge end temperature sensor detects T exhaust ≤T 4 , And maintain this temperature for more than 3 seconds, then adjust the electronic expansion valve to return to the original opening K, at the same time the system limits the frequency to increase, and maintains the current frequency operation. If adjusting the opening degree of the electronic expansion valve = the original opening degree K+10 steps fail, and if T is still satisfied after 5 minutes 1 ≤T exhaust 2 , According to T 2 ≤T exhaust 3 The interval requires the frequency reduction mode to be reduced by 5 Hz, and the frequency is maintained for 2 minutes. If the exhaust gas temperature is detected to decrease after 2 minutes, and the decrease is large, the protection mode is released. If the exhaust temperature continues to rise after 2 minutes, and T 2 ≤T exhaust 3 , Then enter the next adjustment mode.
[0061] When T is detected 2 ≤T exhaust 3 , And the duration is greater than 3 seconds, no matter what mode the system is running in, the system will immediately reduce the frequency to 5Hz and keep the frequency for 2 minutes. When the frequency is reduced for 2 minutes:
[0062] a. If T is still satisfied 2 ≤T exhaust 3 , Then reduce the frequency by 5 Hz and maintain it for 2 minutes, at this time it is still T 2 ≤T exhaust 3 , It will stop protection directly, when T is detected exhaust 2 When, the system exits the shutdown protection mode and restarts operation.
[0063] b. If T 4 ≤T exhaust 2 At the time, keep the frequency running for 30 minutes, and the subsequent system will recalculate the frequency operation according to the ability of the control logic.
[0064] c. If T exhaust 4 When the time is maintained for 3 minutes, the system re-runs according to the logical capacity calculation frequency.
[0065] At any time when the system is running, once T is detected for 3 consecutive seconds 3 ≤T exhaust , The system enters the shutdown protection mode directly, and displays "Exhaust High Temperature Protection" until T exhaust 4 It can be started only when it is time, otherwise the shutdown protection mode is maintained.
[0066] The present invention judges whether to activate the exhaust protection according to the exhaust temperature and the temperature duration. When the exhaust protection is activated, the opening degree of the electronic expansion valve is first activated to adjust. If the adjustment fails, the frequency reduction protection is activated; if it still fails, The shutdown protection is turned on to ensure the accuracy of judgment and improve the efficiency of the system and the service life of the compressor.
[0067] The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection of the present invention. Within range.
