Control method of multi-split outdoor DC fan

Abstract

The present invention relates to the field of air conditioning control. In order to improve the control accuracy of an outdoor DC fan, a control method for a multi-split outdoor DC fan is provided, comprising: 1. determining an initial speed S of the outdoor fan 室外风机初始转速 ; 2. After the outdoor fan speed stabilizes, 取样时间 Time reads the current outdoor ambient temperature T 当前外环 and outdoor coil temperature T 当前外盘 ; 3. Calculate △T 当前 , △T 当前 =T 当前外盘 ‑T 当前外环 ; 4. According to T 当前外环 Determine ΔT 当前目标 ; 5. Calculate C A当前 , C A当前 =△T 当前 ‑ΔT 当前目标 ; 6. Calculate the determination coefficient D, D = C A当前 ‑C A当前‑1 , C A当前‑1 Indicates the C obtained at the previous moment A Value; 7. According to C A当前 and D to calculate the speed regulation rate S 调节量 ; 8. S 目标转速 =S 当前 +S 调节量 , S 当前 is the current speed of the outdoor fan; 9. Repeat steps 2-8. The above steps improve the control accuracy.

Description

Technical Field

[0001] The invention relates to the field of air conditioning control, and in particular to a control method for a multi-split outdoor DC fan. Background Art

[0002] With the guidance of the national energy conservation and emission reduction policy and the change of user consumption concepts, the application ratio of household multi-split units in the field of household air conditioning is getting higher and higher. A household multi-split unit is a large outdoor unit matched with multiple small indoor units. In actual use, most user application scenarios are to only turn on some indoor units. In this case, the outdoor unit only needs to input part of the load to meet the user's requirements. At this time, the outdoor unit compressor is in a low-frequency and low-output operation state. At the same time, the outdoor fan only needs to run at a low speed to meet the heat exchange requirements of the whole machine.

[0003] The prior art uses segmented and fixed value control to control the outdoor fan. This method is inaccurate and easily causes power consumption waste. Summary of the invention

[0004] In order to improve the control accuracy of outdoor DC fans and reduce system energy consumption, a control method for multi-split outdoor DC fans is provided.

[0005] The technical solution adopted by the present invention to solve the above problems is:

[0006] A control method for a multi-split outdoor DC fan includes:

[0007] Step 1: Determine the initial speed S of the outdoor fan 室外风机初始转速 ;

[0008] Step 2: After the outdoor fan speed stabilizes, 取样时间 Time reads the current outdoor ambient temperature T 当前外环 and outdoor coil temperature T 当前外盘 ;

[0009] Step 3: Calculate △T 当前 , △T 当前 =T 当前外盘 -T 当前外环 ;

[0010] Step 4: According to T 当前外环 Determine ΔT 当前目标 ;

[0011] Step 5: Calculate C A当前 , C A当前 =△T 当前 -ΔT 当前目标 ;

[0012] Step 6: Calculate the determination coefficient D, D = C A当前 -CA当前-1 , C A当前-1 Indicates the C obtained at the previous moment A value;

[0013] Step 7: According to C A当前 And the determination coefficient D calculates the speed regulation rate S 调节量 ;

[0014] Step 8: Calculate the outdoor fan target speed S 目标转速 , S 目标转速 =S 当前 +S 调节量 , S 当前 is the current speed of the outdoor fan;

[0015] Step 9. Repeat steps 2-8 while the system is running.

[0016] Furthermore, the step 1 is specifically as follows: after the multi-split system is started, the outdoor ambient temperature T is obtained. 室外环境温度 , and according to T 室外环境温度 Determine the initial speed S of the outdoor fan 室外风机初始转速 :

[0017] When T 室外环境温度 When the temperature is ≤27℃, the initial speed of the outdoor fan is S 室外风机初始转速 =R 初始转速1 ;

[0018] When 27 <T 室外环境温度 ≤32℃, S 室外风机初始转速 =(R 初始转速1 +R 初始转速2 ) / 2;

[0019] when When S 室外风机初始转速 =R 初始转速2 ; Among them, R 初始转速1 and R 初始转速2 is the set value.

[0020] Specifically, R 初始转速1 At 300RPM, R 初始转速2 is 800RPM.

[0021] Furthermore, t 取样时间 =5 seconds.

[0022] Furthermore, the step 4 is specifically as follows:

[0023] When T 当前外环 ≤27℃,ΔT 当前目标 =7℃;

[0024] When 27℃ <T 当前外环 ≤32℃, ΔT 当前目标=5+(32-T 当前外环 )×0.4;

[0025] When 32℃ <T 当前外环 ≤42℃, ΔT 当前目标 =5℃;

[0026] When 42℃ <T 当前外环 ≤52℃, ΔT 当前目标 =(52-T 当前外环 )×0.5;

[0027] when When ΔT 当前目标 =0℃.

[0028] Furthermore, the speed regulation rate S 调节量 The calculation method is:

[0029] When C A当前 >5 and D>0, S 调节量 =1.6×C A当前 +0.8D; when C A当前 >5 and D≤0, S 调节量 =1.6×C A当前 ;

[0030] 0 <C A当前 ≤5 and D>0, S 调节量 =1.6×C A当前 +0.4D;0 <C A当前 ≤5 and D=0, S 调节量 =1.6×C A当前 ; 0 <C A当前 ≤5 and D<0, S 调节量 =0;

[0031] C A当前 =0 and D>0, S 调节量 =D; C A当前 =0 and D = 0, S 调节量 =0; C A当前 =0 and D<0, S 调节量 =1.6D;

[0032] C A当前 <0 and D>0, S 调节量 =0.4×C A当前 ; C A当前 <0 and D=0, S 调节量 =6×C A当前 ; C A当前 <0 and D<0, S 调节量 =6×C A当前 +2D.

[0033] Compared with the prior art, the invention has the following beneficial effects: the outdoor fan speed is associated with the outdoor coil and the outdoor ambient temperature, and segmented control is implemented to improve the control accuracy. When a large number of indoor units of a household multi-split system are turned on, the outdoor fan will run at a high speed to ensure the user's use effect; when a small number of indoor units of a household multi-split system are turned on, the outdoor fan will run at a low speed, effectively reducing the power consumption of the whole machine while ensuring the user's use effect, and effectively reducing the noise of the outdoor unit. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] A control method for a multi-split outdoor DC fan includes:

[0036] Step 1: Determine the initial speed S of the outdoor fan 室外风机初始转速 In order to make the control more accurate, this embodiment is based on the outdoor ambient temperature T after the system is started. 室外环境温度 Determine the initial speed S of the outdoor fan 室外风机初始转速 , the initial speed adopts segmented control:

[0037] When T 室外环境温度 When the temperature is ≤27℃, the initial speed of the outdoor fan is S 室外风机初始转速 =R 初始转速1 ;

[0038] When 27 <T 室外环境温度 ≤32℃, S 室外风机初始转速 =(R 初始转速1 +R 初始转速2 ) / 2;

[0039] when When S 室外风机初始转速 =R 初始转速2 ; Among them, R 初始转速1 and R 初始转速2 is the set value, and R 初始转速1 <R 初始转速2 , R 初始转速1 and R 初始转速2 The specific setting value of can be set according to actual needs. In this embodiment, R 初始转速1 At 300RPM, R 初始转速2 is 800RPM.

[0040] Step 2: After the outdoor fan speed stabilizes, 取样时间 Time reads the current outdoor ambient temperature T 当前外环 and outdoor coil temperature T 当前外盘;t 取样时间 = 5 seconds, can also be set according to actual needs;

[0041] Step 3: Calculate △T 当前 , △T 当前 =T 当前外盘 -T 当前外环 ;

[0042] Step 4: According to T 当前外环 Determine ΔT 当前目标 In order to make the control more precise, this embodiment adopts segmented determination:

[0043] When T 当前外环 ≤27℃,ΔT 当前目标 =7℃;

[0044] When 27℃ <T 当前外环 ≤32℃, ΔT 当前目标 =5+(32-T 当前外环 )×0.4;

[0045] When 32℃ <T 当前外环 ≤42℃, ΔT 当前目标 =5℃;

[0046] When 42℃ <T 当前外环 ≤52℃, ΔT 当前目标 =(52-T 当前外环 )×0.5;

[0047] when When ΔT 当前目标 =0℃;

[0048] Step 5: Calculate C A当前 , C A当前 =△T 当前 -ΔT 当前目标 ;

[0049] Step 6: Calculate the determination coefficient D, D = C A当前 -C A当前-1 , C A当前-1 Indicates the C obtained at the previous moment A value;

[0050] Step 7: According to C A当前 and D to calculate the speed regulation rate S 调节量 :

[0051] <![CDATA[S 调节量 ]]> D＞0 D＝0 D＜0 <![CDATA[C A当前 >5]]> <h2 style=";text-align:left;direction:ltr"><![CDATA[1.6×C <h2 style=";text-align:left;direction:ltr"> A当前 <h2 style=";text-align:left;direction:ltr"> +0.8D]]><h2 style=";text-align:left;direction:ltr"> <![CDATA[1.6×C A当前 ]]> <![CDATA[1.6×C A当前 ]]> <![CDATA[0<C A当前 ≤5]]> <![CDATA[1.6×C A当前 +0.4D]]> <![CDATA[1.6×C A当前 ]]> 0 <![CDATA[C A当前 =0]]> 1.0×D 0 1.6D <![CDATA[C A当前 <0]]> <![CDATA[0.4×C A当前 ]]> <![CDATA[6×C A当前 ]]> <h2 style=";text-align:left;direction:ltr"><![CDATA[6×C <h2 style=";text-align:left;direction:ltr"> A当前 <h2 style=";text-align:left;direction:ltr"> +2D]]><h2 style=";text-align:left;direction:ltr">

[0052] Step 8: S 目标转速 =S 当前 +S 调节量 , S 当前is the current speed of the outdoor fan;

[0053] Step 9. Repeat steps 2-8 while the system is running.

[0054] The outdoor fan speed is linked to the outdoor coil and the outdoor ambient temperature, and segmented control is implemented. When a large number of indoor units of the household multi-split system are turned on, the outdoor fan will run at high speed to ensure the user's use effect; when a small number of indoor units of the household multi-split system are turned on, the outdoor fan will run at low speed. Under the premise of ensuring the user's use effect, the power consumption of the whole machine is effectively reduced, and the noise of the outdoor unit is effectively reduced.

Claims

1. A control method for a multi-split outdoor DC fan, characterized in that: include: Step 1: Determine the initial speed S of the outdoor fan 室外风机初始转速 ; Step 2: After the outdoor fan speed stabilizes, 取样时间 Time reads the current outdoor ambient temperature T 当前外环 and outdoor coil temperature T 当前外盘 ; Step 3: Calculate △T 当前 , △T 当前 =T 当前外盘 -T 当前外环 ; Step 4: According to T 当前外环 Determine ΔT 当前目标 ; Step 5: Calculate C A当前 , C A当前 =△T 当前 -ΔT 当前目标 ; Step 6: Calculate the determination coefficient D, D = C A当前 -C A当前-1 , C A当前-1 Indicates the C obtained at the previous moment A value; Step 7: According to C A当前 And the determination coefficient D calculates the speed regulation rate S 调节量 : When C A当前 >5 and D>0, S 调节量 =1.6×C A当前 +0.8D; when C A当前 >5 and D≤0, S 调节量 =1.6×C A当前 ; 0 <C A当前 ≤5 and D>0, S 调节量 =1.6×C A当前 +0.4D;0 <C A当前 ≤5 and D=0, S 调节量 =1.6×C A当前 ; 0 <C A当前 ≤5 and D<0, S 调节量 =0; C A当前 =0 and D>0, S 调节量 =D; C A当前 =0 and D = 0, S 调节量 =0; C A当前 =0 and D<0, S 调节量 =1.6D; C A当前 <0 and D>0, S 调节量 =0.4×C A当前 ; C A当前 <0 and D=0, S 调节量 =6×C A当前 ; C A当前 <0 and D<0, S 调节量 =6×C A当前 +2D; Step 8: Calculate the outdoor fan target speed S 目标转速 , S 目标转速 =S 当前 +S 调节量 , S 当前 is the current speed of the outdoor fan; Step 9. Repeat steps 2-8 while the system is running.

2. The control method of the multi-split outdoor DC fan according to claim 1 is characterized in that: The step 1 is specifically as follows: after the multi-connected system is started, the outdoor ambient temperature T is obtained. 室外环境温度 , and according to T 室外环境温度 Determine the initial speed S of the outdoor fan 室外风机初始转速 : When T 室外环境温度 When ≤27℃, the initial speed of the outdoor fan is S 室外风机初始转速 =R 初始转速1 ; When 27 <T 室外环境温度 ≤32℃, S 室外风机初始转速 =(R 初始转速1 +R 初始转速2 ) / 2; When T 室外环境温度 >32℃,S 室外风机初始转速 =R 初始转速2 ; Among them, R 初始转速1 and R 初始转速2 is the set value.

3. The control method of the multi-split outdoor DC fan according to claim 2 is characterized in that: R 初始转速1 At 300RPM, R 初始转速2 is 800RPM.

4. The control method of a multi-split outdoor DC fan according to claim 1, characterized in that: t 取样时间 =5 seconds.

5. The control method of a multi-split outdoor DC fan according to claim 1, characterized in that: The step 4 is specifically as follows: When T 当前外环 ≤27℃,ΔT 当前目标 =7℃; When 27℃ <T 当前外环 ≤32℃, ΔT 当前目标 =5+(32-T 当前外环 )×0.4; When 32℃ <T 当前外环 ≤42℃, ΔT 当前目标 =5℃; When 42℃ <T 当前外环 ≤52℃, ΔT 当前目标 =(52-T 当前外环 )×0.5; When T 当前外环 >52℃,ΔT 当前目标 =0℃.