CN104791282B - A kind of infrared temp. control electric fan speed regulating method - Google Patents

Abstract

The invention discloses a kind of infrared temp. control electric fan speed regulating method, including: system initialization, set desirable thermal comfort index pmv value and PMV bound threshold value, controller monitors current human's temperature and ambient temperature in real time, measured temperature calculates the current pmv value of human body by PMV simplified model, and calculate the difference of human body currency and ideal value, described difference is carried out temperature control threshold value differentiation, according to differentiating that situation sets PMV regulated quantity, described PMV regulated quantity calculates current desired motor speed value by PMV rotating speed model, calculate described tachometer value and account for the percentage ratio of motor maximum (top) speed value, and this percentage ratio is exported PWM waveform as PWM duty cycle, thus controlling fan electromotor revolution, realize temperature control speed governing. the present invention establishes for speed governing PMV rotating speed model, it is possible to carry out speed governing with human body optimum reelability quality for target.

Description

A kind of infrared temp. control electric fan speed regulating method

Technical field

The present invention relates to a kind of fan motor speed regulating method, be specifically related to a kind of infrared temp. control electric fan speed regulating method.

Background technology

The temperature-controlled fan speed regulating method that presently, there are, generally all possess and be automatically adjusted rotation speed of the fan according to human body temperature or be automatically adjusted the function of rotation speed of the fan according to ambient temperature, but all not to regulating according to illustrating in control method, namely how to regulate, the size of regulated quantity and how to regulate problem not specified (NS)s such as making human comfort high; Further, speed regulating method there is also temperature threshold regulation and control drawback, and namely when human body temperature drops to and arranges threshold value, electric fan is closed, and during higher than this threshold value, electric fan is opened. If human body temperature is when this Near Threshold fluctuates, then electric fan meeting frequent start-stop, affects electrical machinery life, and can not carry out speed governing according to body compartments's hot comfort situation.

If application number is 200910193968, the applying date is on November 17th, 2009, the Chinese invention patent that authorized announcement date is on May 23rd, 2012 discloses a kind of multi-mode temperature control fan governor, switch is selected including mode of operation, human body pyroelectricity infrared detection module, temperature collect module, power module, control processing module, solid-state relay, electric fan and temperature display module, this temperature control speed regulating method is: the temperature information inputted by temperature collect module contrasts with temperature preset value, when described input temperature information more than or equal to control processing module temperature preset value time, the PWM ripple of corresponding dutycycle is exported to solid-state relay according to described reduced value, solid-state relay is opened electric fan according to the PWM ripple of this corresponding dutycycle and determines its rotating speed, otherwise, output duty cycle is that the PWM ripple of 0 is to solid-state relay, electric fan is made to be closed. although the method can realize temperature control speed-regulating function, but be a lack of fan speed and regulate foundation, the problem that can not carry out speed governing according to body compartments's hot comfort situation in regulating step.

If application number is 200620014446, the applying date is on 08 30th, 2006, the Chinese utility model patent that authorized announcement date is on 09 05th, 2007 discloses a kind of automatic temperature-controlling electric fan, including circuit for controlling motor, fan, motor, human body sensing device, two-way controlable electric current and temperature sensor circuit, this temperature control speed regulating method is: two-way controlable electric current is opened for the output when human body sensing device exports temperature that useful signal and temperature sensor circuit sense more than or equal to the first setting value and controlled signal to circuit for controlling motor, when the temperature that human body sensing device does not export useful signal or temperature sensor circuit senses is less than the first setting value, output pass controls signal to circuit for controlling motor, circuit for controlling motor for controlling electric machine rotation after being responsive to out control signal, motor stalls is controlled after being responsive to pass control signal.This speed regulating method is only in accordance with set value calculation motor start and stop, it is impossible to according to the problem that Studies of Human Body Heat interval comfort level situation carries out speed governing.

Both the above electric fan temperature control speed regulating method all lacks speed governing foundation, it is impossible to carry out speed governing with human body optimum reelability quality for target, also without the problem that solution carries out speed governing according to body compartments's hot comfort situation.

Summary of the invention

It is an object of the invention to the shortcoming overcoming prior art with not enough, it is provided that a kind of infrared temp. control electric fan speed regulating method. This temperature control speed regulating method, all the time with human body optimal comfort setting value for target, adopts PMV rotating speed model to carry out speed governing, makes human comfort be worth and remain at optimum level; Fan electromotor speed governing adds threshold value discriminating step; set the upper limit threshold of compressor start up condition and the lower threshold of halt condition; can realize being again started up the problem of temperature control speed governing after electric fan is shut down, it is to avoid detected value is when Near Threshold fluctuates, and electric fan can the problem of frequent start-stop.

For solving above-mentioned technical problem, the present invention provides a kind of infrared temp. control electric fan speed regulating method, including:

As it is shown in figure 1, S1. initializes desirable pmv value I_PMV, thermal comfort index PMV upper limit threshold ε₊With lower threshold ε_-。

S2. controller carries out infrared measurement of temperature by human body infrared temperature sensing circuit, environment infrared temperature sensing circuit, in real time monitoring current human temperature t_hWith ambient temperature t_e。

Set up thermal comfort index PMV simplified model, it is known that human thermal comfort index model is:

PMV=(0.303e^-0.036M+0.028){M-W-f_clh_c(t_cl-t_a)-0.0014M(34-t_a)-0.0173M

(5.867-P_a)-3.05[5.7328-0.007(M-W)-P_a]-0.42(M-W-58.2)-(1)

3.96×10^-8f_cl[(t_cl+273)⁴-(t_r+273)⁴]}

Wherein, M is body energy metabolic rate (W/m2), W is the mechanical power (W/m2) done of human body, P_aFor the steam partial pressure (kPa) of human body surrounding air, h_cFor human body surface convection transfer rate (W/m2 K), t_aFor human body ambient air temperature (DEG C), t_rFor the mean radiant temperature (DEG C) in room, f_clFor covering human body external surface area and the ratio not covering body surface area, the t of wearing the clothes_clFor human body clothes hull-skin temperature (DEG C).

Model is simplified, makes body energy metabolic rate M=58.18W/m2, the mechanical power W=0 that human body does, surface area ratio f_cl=1.1, steam partial pressure P_a=1.5kPa, convection transfer rate h_c=4.84W/m²K, human peripheral air themperature t_aMean radiant temperature t with room_r, surveyed ambient temperature t_eEqual, human body clothes hull-skin temperature t_clHuman body temperature t surveyed with infrared sensor_hEqual; Therefore, thermal comfort index PMV simplified model can be obtained:

$\begin{array}{c}PMV=(0.303e^{-2.0945}+0.028)\{58.18-5.324(t_h-t_e)-0.0353(34-t_e)-16.0549-\\ 4.356\×{10}^{-8}\[{(t_h+273)}^4-{(t_e+273)}^4\]\}\end{array}---\left(2\right)$

Wherein, t_hHuman body temperature (DEG C), t is detected by infrared sensor_eAmbient temperature (DEG C) is detected by infrared sensor.

S3. according to detected current human temperature t_hWith ambient temperature t_eThe current thermal comfort index pmv value C of human body is calculated by PMV simplified model formula (2)_PMV, and calculate C_PMVWith set desirable thermal comfort index pmv value I_PMVDifference E_PMV。

S4. temperature control threshold value differentiation is carried out, as it is shown in figure 1, to thermal comfort index PMV difference E_PMVJudge with set temperature control threshold size, it is judged that human thermal comfort index difference, whether beyond upper threshold, namely judges E_pmv>ε₊Whether set up, if E_pmv>ε₊Set up and then enter step S5, set described PMV regulated quantity A_PMV=E_PMVIf being false, judge that whether human thermal comfort index difference is beyond bottom threshold, i.e. E_pmv≤ε_-Judge whether to set up, if E_pmv≤ε_-Set up and then forward step S8, fan electromotor stall to, otherwise forward step S2 to.

Set up the PMV rotating speed model for speed governing, fan motor chooses the single-phase three-speed motor in household fan, its effective tacho value range is 366-1200r/min, thermal comfort span for dispelling the heat is :-1≤PMV≤3, by corresponding with thermal comfort span for effective for single-phase three-speed motor range of speeds such as table 1:

The effective range of speeds of the single-phase three-speed motor of table 1 table corresponding to thermal comfort span

Rotating speed (r/min)	PMV	Rotating speed (r/min)	PMV
				0	-1	710	1.3
0	-0.8	790	1.5
				0	-0.5	880	1.7
0	-0.3	948	1.9
				0	0	970	2.1
0	0.3	1030	2.3
				366	0.5	1070	2.5
460	0.7	1100	2.7
				541	0.9	1184	2.9
630	1.1	1200	3.0

Adopt radial base neural net function that upper table is fitted, input as thermal comfort pmv value regulated quantity A_PMV, it is output as motor speed value S₀, import radial base neural net function and be trained, obtaining PMV rotating speed model is:

$S_0=\underset{i=1}{\overset{19}{\Σ}}{w}_i\exp -{\left(0.8326\right||A_{PMV}-c_i|\left|\right)}^2---\left(3\right)$

Wherein: ‖ A_PMV-c_i‖ is input quantity A_PMVWith weights amount c_iEuclidean distance, w_iFor the weights between hidden layer to output layer, w_i=[w₁w₂w₃...w₁₉]^T=[00.0500.1250.1750.250.3250.3750.4250.4750.5750.6250.6750 .72450.7750.82450.8750.9250.9751]^T, c_i=[c₁c₂c₃...c₁₉]^T=[0000000.30500.38330.45080.59170.65830.71110.79000.80830. 85830.89170.91670.98671.0000]^T。

S5. thermal comfort index PMV regulated quantity A is set_PMV=E_PMV, enter step S6.

S6. according to gained PMV regulated quantity A_PMVThe fan motor rotational speed value S being currently target with human body optimum reelability quality is calculated by PMV rotating speed modular form (3)₀, and calculate described tachometer value S₀Account for maximum (top) speed value S_maxPercentage ratio η, enter step S7.

S7. gained percentage ratio η is exported as PWM duty cycle σ, enter step S9.

S8., PWM duty cycle σ=0, fan electromotor stall are set, enter step S9.

S9. driver controls the break-make of power tube according to the PWM waveform that controller exports, and reaches to control the purpose of fan motor rotational speed, and fan electromotor acts on human body and environment, constitutes closed-loop temperature control speed governing.

S10. judging whether shutdown, if not shutting down, forwarding step S2 to, repeat step S2-S9 and realize fan temperature control speed governing; If shutdown, terminate.

For solving above-mentioned technical problem, a kind of infrared temp. control fan speed-regulating device that the present invention adopts, as shown in Figure 2, its structure is by singlechip controller circuit (1), human body infrared temperature sensing circuit (2), environment infrared temperature sensing circuit (3), button display circuit (4), MOSFET drive circuit (5), motor circuit (6) forms, singlechip controller circuit (1) with, human body infrared temperature sensing circuit (2), ambient temperature sensing circuit (3), button display circuit (4), MOSFET drive circuit (5) passes through power line, signal control line connects, MOSFET drive circuit (5) and motor circuit (6) pass through power line, signal control line connects.

As shown in Figure 3, singlechip controller circuit (1) is made up of integrated circuit U1, quartz crystal XTAL, electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, the 7th jiao of quartz crystal XTAL and integrated circuit U1, the 8th jiao connects, electric capacity C1, C2 be connected on the 7 of integrated circuit respectively, between 8 feet and ground wire, resistance R1 one end ground connection, one end connects with the 9th foot of electric capacity C3, integrated circuit U1, and the other end of electric capacity C3 connects with the 10th foot of integrated circuit U1, VCC, human body infrared temperature sensing circuit (2) is made up of integrated circuit U2, and the 1st foot of integrated circuit U2 connects with VCC, and the 2nd foot of integrated circuit U2 connects with the 2nd foot of integrated circuit U1, the 3rd foot ground connection of integrated circuit U2, ambient temperature sensing circuit (3) is made up of infrared receiving tube RHW, resistance R2, and the positive pole of infrared receiving tube RHW connects with the 1st foot of resistance R2, integrated circuit U1, and the negative pole of infrared receiving tube connects with VCC, button display circuit (4) is by key switch K1-K4, integrated circuit U4 forms, one end of key switch K1-K4 is respectively with the 3 of integrated circuit U1, 4, 5, 6 feet connect, the other end ground connection of key switch K1-K4, the 1-11 foot of integrated circuit U4 connects with the 11-21 foot of integrated circuit U1 respectively, 12 feet of integrated circuit U4 and one end of slide rheostat R3, ground wire connects, 13 feet of integrated circuit U4 connect with the sliding end of slide rheostat R3, 14 feet of integrated circuit U4 and the other end of slide rheostat R3, VCC connects, the 15 of integrated circuit U4, 16 feet are unsettled, MOSFET drive circuit (5) is made up of integrated circuit U3, MOSFET power tube NMOS, stabilivolt WZ, 1st foot of integrated circuit U3 connects with the 2nd foot of power tube NMOS, 2nd foot of integrated circuit U3 connects with the 3rd foot of power tube NMOS, first foot of stabilivolt WZ, ground wire, 3rd foot of integrated circuit U3 connects with VCC, 4th foot of integrated circuit U3 connects with the 22nd foot of integrated circuit U1, and the 2nd foot of stabilivolt WZ connects with the 1st foot of power tube NMOS,Motor circuit (6) is made up of the single-phase three-speed motor of 220V, single-phase three-speed motor one end connects with mains supply 220V, the high speed tap H end of single-phase three-speed motor connects with the 2nd foot of the 1st foot of power tube NMOS, stabilivolt WZ, and the middling speed tap M end of single-phase three-speed motor is unsettled with the low speed tap L end of single-phase three-speed motor.

Accompanying drawing explanation

Fig. 1 is the working-flow figure of the present invention;

Fig. 2 is system hardware structure block diagram;

Fig. 3 is system hardware circuit diagram.

Detailed description of the invention

A kind of infrared temp. control electric fan speed regulating method providing the embodiment of the present invention below in conjunction with accompanying drawing is described further.

As it is shown in figure 1, step S1, first initialize desirable pmv value I_PMV=0, thermal comfort index PMV upper limit threshold ε₊=0.5 and lower threshold ε_-=-0.5, enters step S2.

Step S2, controller monitors current human temperature t in real time by human body infrared temperature sensing circuit, environment infrared temperature sensing circuit_hWith ambient temperature t_e, enter step S3.

Step S3, according to detected current human temperature t_hWith ambient temperature t_eThe current thermal comfort index pmv value C of human body is calculated by PMV simplified model formula (1)_PMV, and calculate C_PMVWith set desirable thermal comfort index pmv value I_PMVDifference E_PMV, enter step S4.

$\begin{array}{c}PMV=(0.303e^{-2.0945}+0.028)\{58.18-5.324(t_h-t_e)-0.0353(34-t_e)-16.0549-\\ 4.356\×{10}^{-8}\[{(t_h+273)}^4-{(t_e+273)}^4\]\}\end{array}---\left(1\right)$

Wherein, t_hHuman body temperature (DEG C), t is detected by infrared sensor_eAmbient temperature (DEG C) is detected by infrared sensor;

Step S4, to thermal comfort index PMV difference E_PMVJudge with set temperature control threshold size, it is judged that human thermal comfort index difference, whether beyond upper threshold, namely judges E_pmv>ε₊Whether set up, if E_pmv>ε₊Set up and then enter step S5, set described PMV regulated quantity A_PMV=E_PMVIf being false, judge that whether human thermal comfort index difference is beyond bottom threshold, namely judges E_pmv≤ε_-Whether set up, if E_pmv≤ε_-Set up and then enter step S8, otherwise forward step S2 to.

Step S5, sets thermal comfort index PMV regulated quantity A_PMV=E_PMV, enter step S6.

Step S6, according to gained PMV regulated quantity A_PMVThe fan motor rotational speed value S being currently target with human body optimum reelability quality is calculated by PMV rotating speed modular form (2)₀, and calculate described tachometer value S₀Account for maximum (top) speed value S_maxPercentage ratio η, enter step S7.

PMV rotating speed model is:

$S_0=\stackrel{19}{\Σ}{w}_i\exp -{\left(0.8326\right||A_{PMV}-c_i|\left|\right)}^2---\left(2\right)$

Wherein: ‖ A_PMV-c_i‖ is input quantity A_PMVWith the Euclidean distance of weights amount, w_iFor the weights between hidden layer to output layer, w_i=[w₁w₂w₃...w₁₉]^T=[00.0500.1250.1750.250.3250.3750.4250.4750.5750.6250.6750 .72450.7750.82450.8750.9250.9751]^T, c_i=[c₁c₂c₃...c₁₉]^T=[0000000.30500.38330.45080.59170.65830.71110.79000.80830. 85830.89170.91670.98671.0000]^T。

Step S7, using gained percentage ratio η as PWM duty cycle σ, controller exports PWM waveform according to dutycycle σ, enters step S9.

Step S8, PWM duty cycle, fan electromotor stall enters step S9.

Step S9, driver controls the break-make of power tube according to the PWM waveform that controller exports, and reaches to control the purpose of fan motor rotational speed, and fan electromotor acts on human body and environment, it is achieved temperature control speed governing.

Step S10, it may be judged whether shutdown, if not shutting down, forwards step S2 to, repeats step S2-S9 and realizes the fan temperature control speed governing of circulation on-line monitoring; If shutdown, terminate.

A kind of infrared temp. control fan speed-regulating device that the present invention adopts, its processing and fabricating is simple and convenient, processes shown in by specification accompanying drawing. Integrated circuit in each circuit and other elements are commercially available prod, and in circuit, connection between each chip is all the Single-chip Controlling connected mode of standard, errorless get final product work as long as installing by circuit diagram. It is singlechip controller that the integrated circuit model used in circuit is respectively as follows: U1, and model is SST89E516RD;U2 is infrared sensor of the human body model is D205B; U3 is MOSFET driving chip model is MIC5104; U4 is LCD display model is LCD1602.

A kind of infrared temp. control fan speed-regulating device work process that the present invention adopts is as follows:

After switching on power, singlechip controller initializes, LCD display initializes, then button is detected by single-chip microcomputer, and implement the data of monitoring infrared sensor of the human body and infrared receiving tube, institute's Monitoring Data is displayed, and fan motor rotational speed is set according to Monitoring Data, temperature control mode and manual gear pattern can be set by button.

The present invention can carry out interval temperature control and differentiate, it is possible to when solving only in accordance with a certain set value calculation motor start and stop, and temperature fluctuates the problem causing motor frequent start-stop near this setting value; Foundation has rotational speed regulation model, makes temperature air-conditioning joint have something to base on.

Claims (5)

1. an infrared temp. control electric fan speed regulating method, it is characterised in that comprise the following steps:

S1. system initialization, sets desirable pmv value I_PMV, thermal comfort index PMV upper limit threshold ε₊With lower threshold ε_-;

S2. controller monitors current human's temperature and ambient temperature in real time by human body infrared temperature sensing circuit, environment infrared temperature sensing circuit;

S3. human body current thermal comfort index pmv value C is calculated with ambient temperature value by thermal comfort index PMV simplified model according to surveyed current human's temperature value_PMV; And calculate the current thermal comfort index pmv value C of described human body_PMVWith set desirable thermal comfort index pmv value I_PMVDifference E_PMV;

S4. to described difference E_PMVCarry out temperature control threshold value differentiation, it is judged that human thermal comfort index difference, whether beyond upper threshold, namely judges E_pmv>ε₊Whether set up, if E_pmv>ε₊Setting up and then enter step S5, if being false, judging that whether human thermal comfort index difference is beyond bottom threshold, namely judges E_pmv≤ε_-Whether set up, if E_pmv≤ε_-Set up and then enter step S8, otherwise forward step S2 to;

S5. thermal comfort index PMV regulated quantity A is set_PMV=E_PMV;

S6. thermal comfort index PMV regulated quantity A_PMVThe fan motor rotational speed value S being currently target with human body optimum reelability quality is calculated by PMV rotating speed model₀, and calculate described tachometer value S₀Account for maximum (top) speed value S_maxPercentage ratio η;

S7. percentage ratio η is exported PWM waveform as PWM duty cycle σ, forward step S9 to;

S8., PWM duty cycle σ=0, fan electromotor stall are set, forward step S9 to;

S9. driver controls the break-make of power tube according to the PWM waveform that controller exports, thus controlling fan motor rotational speed, it is achieved temperature control speed governing;

S10. judging whether shutdown, if not shutting down, forwarding step S2 to; If shutdown, terminate.

2. infrared temp. control electric fan speed regulating method according to claim 1, it is characterised in that the model of PMV rotating speed described in step S6 is that pmv value is formed by Function Mapping with corresponding fan motor rotational speed value.

3. infrared temp. control electric fan speed regulating method according to claim 2, it is characterised in that: the Function Mapping in the model of PMV rotating speed described in step S6 is radial base neural net Function Mapping.

4. infrared temp. control electric fan speed regulating method according to claim 3, it is characterised in that: described radial base neural net Function Mapping refers to: input as thermal comfort pmv value regulated quantity A_PMV, it is output as motor speed value S₀, import radial base neural net function and be trained, obtain PMV rotating speed model as follows:

$S_0=\underset{i=1}{\overset{19}{\Σ}}{w}_i\exp -{\left(0.8326\right||A_{PMV}-c_i|\left|\right)}^2$

Wherein: ‖ A_PMV-c_i‖ is input quantity A_PMVWith weights amount c_iEuclidean distance, w_iFor the weights between hidden layer to output layer.

5. infrared temp. control electric fan speed regulating method according to claim 1, it is characterised in that: in described step S3, the current thermal comfort index pmv value of human body is calculated by below equation:

PMV=(0.303e^-2.0945+0.028){58.18-5.324(t_h-t_e)-0.0353(34-t_e)-16.0549-4.356×10^-8[(t_h+273)⁴-(t_e+273)⁴]}

Wherein, wherein, t_hHuman body temperature (DEG C), t is detected by infrared sensor_eAmbient temperature (DEG C) is detected by infrared sensor.