CN106484008A - Oven temperature control system based on multi-point temp sensing and method - Google Patents
Oven temperature control system based on multi-point temp sensing and method Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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Abstract
The present invention relates to the system and method that a kind of oven temperature based on multi-point temp sensing controls, the method comprises the following steps：(1) set the parameter controlling for oven temperature；(2) baking oven, the legitimacy of inspection parameter, and print parameters are started；(3) start to warm up, and oven temperature is controlled；(4) remove this arrange parameter, stop all outputs, and terminate this operation.The system and method being controlled based on the oven temperature of multi-point temp sensing using this, by being distributed three groups of multichannel temperature sensing sensors in casing, the input value of 3 groups of sensors of interactive computing, set up two-dimensional quadrature PID function, in order to control the power of heater, and running is replaced by left and right blower fan, realize the risk that product Quick uniform avoids overtemperature while intensification and owes temperature in baking oven, be with a wide range of applications.
Description
Technical field
The present invention relates to baking oven technical field, more particularly, to oven temperature control technology field, specifically refer to one kind and be based on
The oven temperature control system of multi-point temp sensing and method.
Background technology
The industry such as automobile, electronics, household electrical appliances needs to need to carry out heat treated to product, to keep away after completing Product Assembly at present
Exempt to cause the damage of product because of the physical property that material expands with heat and contract with cold.Current heat treated is used mostly Electric heat oven and carries out.
But product once piled by the Electric heat oven generally existing casing using on market, the intensification of casing each several part temperature is uneven, plus
Hot overtemperature or the defect being not reaching to temperature requirement, cause to need the product of heating because overtemperature deformation or do not arrive temperature requirement and
The manufacturability producing is damaged.
Current baking oven production technology is blown to casing by blower fan using after the programme controlled electric heater of PID heats
Interior product is heated.Because the product in casing during actually used has intercepted flowing in casing for the hot blast, and by
In heater the heating rate in temperature-rise period cannot with casing the intensification uniformity of product consistent.Difference portion in casing
Temperature contrast in temperature-rise period for the product of position leads to topical product to there is the risk of temperature too high (overtemperature), or leads to office
The temperature of portion's product is unable to reach the risk of design temperature (owing temperature).
Content of the invention
The purpose of the present invention is the shortcoming overcoming above-mentioned prior art, there is provided it is fast that one kind is capable of product in baking oven
Speed avoid overtemperature while uniformly intensification and owe the risk of temperature the oven temperature control system based on multi-point temp sensing and
Method.
To achieve these goals, the present invention's has following composition：
The oven temperature control method that should be sensed based on multi-point temp, is comprised the following steps：
(1) set the parameter controlling for oven temperature；
(2) baking oven, the legitimacy of inspection parameter, and print parameters are started；
(3) start to warm up, and oven temperature is controlled；
(4) remove this arrange parameter, stop all outputs, and terminate this operation.
It is preferred that described parameter includes fiducial temperature, maximum temperature, minimum temperature, working time and temperature retention time.
It is preferred that described step (2) comprises the following steps：
(2-1) start baking oven, read Code and close oven door；
(2-2) reading parameter and judge whether parameter is legal, if it is, continuing step (2-3), otherwise, continuing step
(2-4)；
(2-3) print parameters；
(2-4) report an error, debug, continues step (4).
More preferably, described judge whether parameter is legal, specially：
Judge each parameter whether in legal interval, wherein, the legal interval of fiducial temperature is (70 degree, 150 degree), highest
The legal interval of temperature is (- 0 ,+10), and the legal interval of minimum temperature is (- 5 ,+0), and the legal interval of working time is (10
Minute, 90 minutes), the legal interval of temperature retention time is (0 minute, 90 minutes).
It is preferred that described step (3), specifically include following steps：
(3-1) begin to warm up control；
(3-2) at least 6 points for measuring temperature are chosen according to systemic presupposition, and whether all to judge the temperature of each described point for measuring temperature
Higher than the minimum temperature setting, if it is, continuing step (3-3), otherwise, continue step (3-4)；
(3-3) start working timing；
(3-4) judge in 6 points for measuring temperature, to whether there is the point for measuring temperature higher than the maximum temperature setting, if it is, starting
Radiating, lights red led, opens buzzer, continues step (3-9)；
(3-5) judge whether the working time reaches parameter request, if it is, closing heater；
(3-6) judging whether be provided with temperature retention time in parameter, if it is, continuing step (3-7), otherwise, continuing step
Suddenly (3-8)；
(3-7) close blower fan, and start heat preservable timer, until temperature retention time reaches parameter request；
(3-8) start to radiate, light yellow indicator lamp, open buzzer；
(3-9) stop baking oven or open oven door；
(3-10) close blower fan, heater, yellow indicator lamp, red led and buzzer, and monitoring printing data continues
Continuous step (4).
More preferably, described step (3-1), specifically includes following steps：
(3-1-1) open heater；
(3-1-2) the described point for measuring temperature of each according to selected by systemic presupposition calculates left side mean temperature and right side is average
Temperature；
(3-1-3) in real time relatively and judge the size of left side mean temperature and right side mean temperature, if left side is averagely warm
Degree is larger, then open left side blower fan, if right side mean temperature is larger, opens right side blower fan, to guarantee each described survey
Warm spot uniformly heats up, and controls heater by two-dimensional quadrature PID function, then proceedes to step (3-2).
Further, described heater is controlled by two-dimensional quadrature PID function, specifically include following steps：
(3-1-3-1) PID output is calculated as the input of PID by the average temperature value of middle one group of temperature sensor
u(t)
(3-1-3-2) by the maximum temperature value in the temperature sensor of each road as the integral and calculating output having restriction parameter
C (t), specially
Wherein, tmax is the maximum temperature of current each point, and Tc is the temperature of the initial adjustment setting, and Tmax is to set
High-temperature, N is the integrated depth parameter that can arrange, and t is the sampling time；
(3-1-3-2) calculate heater SCR control output uout (t)=C (t) × u (t).
More preferably, described start to radiate, specially：
Close heater, start blower fan, the startup of blower fan can switch about startup according to the time interval of program setting
Blower fan or entrance manual mode start left and right blower fan simultaneously.
Also include a kind of for realize method any one of claim 1 to 8 based on multi-point temp sensing
Oven temperature control system, including：
Baking oven, for heating product, described baking oven include heater, at least left and right 2 blower fans and at least 3 give vent to anger
Mouthful；
Printer, the parameter for setting of printing and monitoring data；
At least 6 temperature sensors, for measuring the temperature of point for measuring temperature, described point for measuring temperature and a pair of temperature sensor 1
Should；
Computer, for setting the parameter controlling for oven temperature, is controlled to heating process, described computer
It is connected with described baking oven, printer and temperature sensor respectively.
It is preferred that described computer also includes display, described display is used for staff's display system work
Make situation.
It is preferred that described system also includes two-dimensional code scanning rifle, described two-dimensional code scanning rifle is used for obtaining heated
Product product type.
The system and method being controlled based on the oven temperature of multi-point temp sensing using this, by being distributed three groups in casing
Multichannel temperature sensing sensor, the input value of 3 groups of sensors of interactive computing, set up two-dimensional quadrature PID function, in order to control heater
Power, and running is replaced by left and right blower fan, realize product Quick uniform in baking oven and avoid overtemperature while intensification and owe
The risk of temperature, is with a wide range of applications.
Brief description
Fig. 1 is the oven temperature control system based on multi-point temp sensing of the present invention and the control schematic diagram of method.
Fig. 2 is the oven temperature control system based on multi-point temp sensing of the present invention and the temp. control function block of method
Flow chart.
Fig. 3 is the oven temperature control system based on multi-point temp sensing of the present invention and the baking oven main control process flow of method
Figure.
Fig. 4 is the oven temperature control system based on multi-point temp sensing and the method oven structure schematic diagram of the present invention.
Fig. 5 is the oven temperature control system based on multi-point temp sensing and the method heating temp uphill process of the present invention
Schematic diagram.
Fig. 6 is the oven temperature control system based on multi-point temp sensing and the signal of method PID curve of output of the present invention
Figure.
Specific embodiment
In order to more clearly describe the technology contents of the present invention, to carry out further with reference to specific embodiment
Description.
In a kind of feasible embodiment, it is somebody's turn to do the oven temperature control method based on multi-point temp sensing, such as Fig. 2 and Tu
Shown in 3, comprise the following steps：
(1) set the parameter controlling for oven temperature；
(2) baking oven, the legitimacy of inspection parameter, and print parameters are started；
(3) start to warm up, and oven temperature is controlled；
(4) remove this arrange parameter, stop all outputs, and terminate this operation.
In one kind preferably embodiment, described parameter includes fiducial temperature, maximum temperature, minimum temperature, work
Time and temperature retention time.
In one kind preferably embodiment, described step (2) comprises the following steps：
(2-1) start baking oven, read Code and close oven door；
(2-2) reading parameter and judge whether parameter is legal, if it is, continuing step (2-3), otherwise, continuing step
(2-4)；
(2-3) print parameters；
(2-4) report an error, debug, continues step (4).
In one kind more preferably embodiment, described judges whether parameter is legal, specially：
Judge each parameter whether in legal interval, wherein, the legal interval of fiducial temperature is (70 degree, 150 degree), highest
The legal interval of temperature is (- 0 ,+10), and the legal interval of minimum temperature is (- 5 ,+0), and the legal interval of working time is (10
Minute, 90 minutes), the legal interval of temperature retention time is (0 minute, 90 minutes).
In one kind preferably embodiment, described step (3), specifically include following steps：
(3-1) begin to warm up control；
(3-2) at least 6 points for measuring temperature are chosen according to systemic presupposition, and whether all to judge the temperature of each described point for measuring temperature
Higher than the minimum temperature setting, if it is, continuing step (3-3), otherwise, continue step (3-4)；
(3-3) start working timing；
(3-4) judge in 6 points for measuring temperature, to whether there is the point for measuring temperature higher than the maximum temperature setting, if it is, starting
Radiating, lights red led, opens buzzer, continues step (3-9)；
(3-5) judge whether the working time reaches parameter request, if it is, closing heater；
(3-6) judging whether be provided with temperature retention time in parameter, if it is, continuing step (3-7), otherwise, continuing step
Suddenly (3-8)；
(3-7) close blower fan, and start heat preservable timer, until temperature retention time reaches parameter request；
(3-8) start to radiate, light yellow indicator lamp, open buzzer；
(3-9) stop baking oven or open oven door；
(3-10) close blower fan, heater, yellow indicator lamp, red led and buzzer, and monitoring printing data continues
Continuous step (4).
In one kind more preferably embodiment, described step (3-1), specifically include following steps：
(3-1-1) open heater；
(3-1-2) the described point for measuring temperature of each according to selected by systemic presupposition calculates left side mean temperature and right side is average
Temperature；
(3-1-3) in real time relatively and judge the size of left side mean temperature and right side mean temperature, if left side is averagely warm
Degree is larger, then open left side blower fan, if right side mean temperature is larger, opens right side blower fan, to guarantee each described survey
Warm spot uniformly heats up, and controls heater by two-dimensional quadrature PID function, then proceedes to step (3-2).
In a kind of further embodiment, described controls heater by two-dimensional quadrature PID function, concrete bag
Include following steps：
(3-1-3-1) PID output is calculated as the input of PID by the average temperature value of middle one group of temperature sensor
u(t)
(3-1-3-2) by the maximum temperature value in the temperature sensor of each road as the integral and calculating output having restriction parameter
C (t), specially：
Wherein, tmax is the maximum temperature of current each point, and Tc is the temperature of the initial adjustment setting, and Tmax is to set
High-temperature, N is the integrated depth parameter that can arrange, and t is sampling time parameter；
(3-1-3-2) calculate heater SCR control output uout (t)=C (t) × u (t).
In one kind more preferably embodiment, described starts radiating, specially：
Close heater, start blower fan, the startup of blower fan can switch about startup according to the time interval of program setting
Blower fan or entrance manual mode start left and right blower fan simultaneously.
Also include a kind of for realize method any one of claim 1 to 8 based on multi-point temp sensing
Oven temperature control system, including：
Baking oven, for heating product, described baking oven include heater, at least left and right 2 blower fans and at least 3 give vent to anger
Mouthful；
Printer, the parameter for setting of printing and monitoring data；
At least 6 temperature sensors, for measuring the temperature of point for measuring temperature, described point for measuring temperature and a pair of temperature sensor 1
Should；
Computer, for setting the parameter controlling for oven temperature, is controlled to heating process, described computer
It is connected with described baking oven, printer and temperature sensor respectively.
In one kind preferably embodiment, described computer also includes display, and described display is used for work
Make personnel's display system working condition.
In one kind preferably embodiment, described system also includes two-dimensional code scanning rifle, described two-dimensional code scanning
Rifle is used for obtaining the product type of heated product.
In one kind more specifically embodiment, the control system of the present invention is as shown in figure 1, be made up of following key element：
The input of system includes：
1.1) temperature：Temperature collect module adopts the thermocouple of Graduation Number J or K, and three groups gather simultaneously, adopts the left side at present
One group of 3 tunnel；One group of 3 tunnel in the right；The scheme on middle one group of 2 tunnel；
1.2) baking oven state：Using switch input quantity：Oven door unlatching/closed mode；
1.3) product parameters setting：The fiducial temperature (70 degree, 150 degree) controlling, maximum temperature (- 0 ,+10), minimum temperature
(- 5 ,+0), the working time (10 minutes, 90 minutes), temperature retention time (0 minute, 90 minutes)；
1.4) blower fan electric current：In order to judge blower fan whether normal work；
1.5) program pushbutton switch：Program start button, inputs program enabling signal；Program pause button, input is interrupted
Program singal.
The output of system includes：
2.1) electrical heating analog quantity：One tunnel controls power of controlled silicon transformator；
2.2) air-blower control switching value：The switch by Control two Fans for the two-way interlocking, only one every time
Open；
2.3) run indicator switching value：End-of-job (yellow, buzzing), working condition (green), job failure (red)；
2.4) display screen output：(middle one group of meansigma methodss calculate input, left and right two for traditional PI D to multichannel real time temperature
Two groups of side is used for controlling the conversion of blower fan, and participates in calculating and the judgement of minimum maximum temperature), cumulative activation timing, add up to protect
The warm time, name of product, product type, fiducial temperature, maximum temperature, minimum temperature, mean temperature etc.；
2.5) printer：Print operational factor (product type, running parameter, temperature time curve)；
2.6) data output：Operational factor (product type, running parameter, temperature time curve, PID time graph, output
Signal/time) PC is stored in Excel file form.Output of further can networking backups to server.
The control of program requires：
3.1) all of input detection, all output of memory dump machine are started after baking oven is restarted；
3.2) before reading oven door shutdown signal, all outputs are closed；
3.3) product parameters reading in after reading oven door shutdown signal, start baking oven workflow；
3.4) program work starts output services parameter on monitoring screen, PID calculating parameter, each road sensor real-time
Temperature, cut-in time, the every of current procedure controls output, cumulative activation timing, accumulative temperature retention time；
3.5) real time temperature of program record each road sensor, electrical heating analog quantity calculates output, fan switch amount in real time
Export in real time；
3.6) according to the frequency of sampling and the depth of numerical filtering of the parameter adjustment temperature sensor that can set；
3.7) control PAU+FCU system with the left and right temperature averages of two groups of temperature sensors of baking oven both sides：
3.7.1) switch blower fan direction when the MTD on both sides exceedes temperature value (can change) of setting；
3.7.2) switch blower fan direction when the operating of unidirectional blower fan was more than 5 minutes；
3.8) control and require：
3.8.1) any point temperature is not less than the minimum temperature of setting；
3.8.2) any point temperature is not higher than the maximum temperature setting；
3.8.3) two-dimensional quadrature PID function calculates：
3.8.3.1) the first dimension calculates biography by the average temperature value of middle one group of temperature sensor as the input of PID
System PID output u (t)；
3.8.3.2) second tie up by the maximum temperature value in the temperature sensor of each road as the integrating meter having restriction parameter
Calculate, output C (t)；
3.8.3.3) heater SCR control output uout (t)=C (t) × u (t),
Wherein：
Wherein：T0：The operating temperature setting；
tmax：The maximum temperature of current each point；
Tc：Set the temperature (T0 can be taken) of initial adjustment
Tmax：The maximum temperature setting；
>0：E (t) value can only be more than zero, when tmax is less than Tc, e (t)=0
N：The integrated depth parameter that can arrange；
3.8.4) temperature acquisition：Using the temperature averages of cycling numerical value filtering, sampling period and numerical filtering depth can
Setting；
3.8.5) when all temperature spots are higher than all to set minimum temperature, start cumulative operation time；
3.8.6) timing reaches the setting working time, and cut-out heater exports and cuts off fan power and starts to be incubated；
3.8.7) reach insulation timing and open fan power, output services end switch signal opens amber light and buzzing；
3.9) interrupt warning output：
3.9.1) baking oven is started working, and any point temperature exceedes setting maximum temperature, exports red alarm, exports buzzing
Signal；
3.9.2) baking oven enabling signal, end-of-job after baking oven enabling are waited after alarm signal output, wait is restarted.
The baking oven air channel of the present invention and blower fan turning are as shown in Figure 4：
1st, baking oven adopts 2 extension sets altogether, and a first from left is right, blows on the left of left air box, right blower fan Lateral supply to the right；
2nd, left and right blower fan adopts interlock system, can only have a blower fan work when system works；
3rd, PAU+FCU system wind direction must is fulfilled for the temperature requirement of program setting.
In some other embodiments, the major control of this control system is to the temperature liking in baking oven, the difficulty of control
Point essentially consists in when placed the product more than comparison in baking oven, because air circulation is poor, causes oven temperature not
Equilibrium, settling mode mainly uses left and right to amount to 6 point for measuring temperature detection left and right sides temperature, and using two blower fans according to survey
The feedback temperature of warm spot in turn to the left and right both direction blow heated hot blast.
Control system input signal：
1st, Temperature Feedback：6 points of temperature K-type thermocouples
2nd, product type：Swept by two-dimensional code scanning rifle
3rd, product parameters：LAN server is sent to master control PC by the form of file
4th, baking oven state：Start button, scram button, door trip etc.
Control system output signal：
1st, temperature computer heating control：The special three-phase solid relay switching of heater is controlled by a road high-speed pulse output
Heater be switched on and off controlling the output of heater
2nd, temperature wind direction switching：Control the start and stop of blower fan by 2 tunnel output control blower fan catalysts, and then control wind
To.
3rd, working condition instruction：By the red greenish-yellow tri coloured lantern of 4 tunnel output controls and buzzer
4th, man machine interface shows：PC display shows six tunnel temperature, cumulative operation time, accumulative temperature retention time in real time
And hard data preserves：Horizontal sliding printer prints operational factor (product type, running parameter, temperature time curve)
Soft data preserves：Operational factor is automatically saved to server by master control PC, and (product type, running parameter, during temperature
Half interval contour, PID time graph, output signal time record etc.).
As seen from Figure 5：
The 1st, 8 tunnel temperature can be obtained from temperature curve after PID control, temperature rises uniformly；
2nd, baking oven bulk temperature controls in effective range, reaches cardinal temperature requirement；
3rd, baking oven product heating temperature time control in the range of.
As seen from Figure 6：
1st, heater the incipient stage can 100% output, reach unlatching be brought rapidly up require.
2nd, when there being any road to reach when setting initial temperature Tc adjusting of setting in the temperature of each road, control the meter of output
Calculate function to start working to ensure that any portion of product in casing is not in the phenomenon of overtemperature, and make heater wattage output
It is effectively controlled.
The system and method being controlled based on the oven temperature of multi-point temp sensing using this, by being distributed three groups in casing
Multichannel temperature sensing sensor, the input value of 3 groups of sensors of interactive computing, set up two-dimensional quadrature PID function, in order to control heater
Power, and running is replaced by left and right blower fan, realize product Quick uniform in baking oven and avoid overtemperature while intensification and owe
The risk of temperature, is with a wide range of applications
In this description, the present invention is described with reference to its specific embodiment.But it is clear that still can make
Various modifications and alterations are without departing from the spirit and scope of the present invention.Therefore, specification and drawings be considered as illustrative
And it is nonrestrictive.
Claims (11)
1. a kind of oven temperature control method based on multi-point temp sensing is it is characterised in that described method includes following step
Suddenly：
(1) set the parameter controlling for oven temperature；
(2) baking oven, the legitimacy of inspection parameter, and print parameters are started；
(3) start to warm up, and oven temperature is controlled；
(4) remove this arrange parameter, stop all outputs, and terminate this operation.
2. the oven temperature control method of multi-point temp according to claim 1 sensing is it is characterised in that described parameter
Including fiducial temperature, maximum temperature, minimum temperature, working time and temperature retention time.
3. the oven temperature control method of multi-point temp according to claim 1 sensing is it is characterised in that described step
(2) comprise the following steps：
(2-1) start baking oven, read Code and close oven door；
(2-2) reading parameter and judge whether parameter is legal, if it is, continuing step (2-3), otherwise, continuing step (2-
4)；
(2-3) print parameters；
(2-4) report an error, debug, continues step (4).
4. the oven temperature control method of multi-point temp according to claim 3 sensing is it is characterised in that described judgement
Whether parameter is legal, specially：
Judge each parameter whether in legal interval, wherein, the legal interval of fiducial temperature is (70 degree, 150 degree), maximum temperature
Legal interval be (- 0 ,+10), the legal interval of minimum temperature is (- 5 ,+0), the working time legal interval for (10 minutes,
90 minutes), the legal interval of temperature retention time is (0 minute, 90 minutes).
5. the oven temperature control method of multi-point temp according to claim 1 sensing is it is characterised in that described step
(3), following steps are specifically included：
(3-1) begin to warm up control；
(3-2) at least 6 points for measuring temperature are chosen according to systemic presupposition, and judge that whether the temperature of each described point for measuring temperature is higher than all
The minimum temperature setting, if it is, continuing step (3-3), otherwise, continues step (3-4)；
(3-3) start working timing；
(3-4) judge in 6 points for measuring temperature, to whether there is the point for measuring temperature higher than the maximum temperature setting, if it is, starting to radiate,
Light red led, open buzzer, continue step (3-9)；
(3-5) judge whether the working time reaches parameter request, if it is, closing heater；
(3-6) judging whether be provided with temperature retention time in parameter, if it is, continuing step (3-7), otherwise, continuing step (3-
8)；
(3-7) close blower fan, and start heat preservable timer, until temperature retention time reaches parameter request；
(3-8) start to radiate, light yellow indicator lamp, open buzzer；
(3-9) stop baking oven or open oven door；
(3-10) close blower fan, heater, yellow indicator lamp, red led and buzzer, and monitoring printing data continues step
Suddenly (4).
6. the oven temperature control method of multi-point temp according to claim 5 sensing is it is characterised in that described step
(3-1), following steps are specifically included：
(3-1-1) open heater；
(3-1-2) the described point for measuring temperature of each according to selected by systemic presupposition calculates left side mean temperature and right side is averagely warm
Degree；
(3-1-3) in real time relatively and judge the size of left side mean temperature and right side mean temperature, if left side mean temperature is relatively
Greatly, then open left side blower fan, if right side mean temperature is larger, open right side blower fan, to guarantee each described point for measuring temperature
Uniformly heat up, and heater is controlled by two-dimensional quadrature PID function, then proceed to step (3-2).
7. the oven temperature control method of multi-point temp sensing according to claim 6 is it is characterised in that described passes through
Two-dimensional quadrature PID function controls heater, specifically includes following steps：
(3-1-3-1) PID output u (t) is calculated as the input of PID by the average temperature value of middle one group of temperature sensor
(3-1-3-2) by the maximum temperature value in the temperature sensor of each road as there being the integral and calculating limiting parameter to export C (t), have
Body is：
Wherein, tmax is the maximum temperature of current each point, and Tc is the temperature of the initial adjustment setting, and Tmax is the highest temperature setting
Degree, N is the integrated depth parameter that can arrange, and t is sampling time parameter；
(3-1-3-2) calculate heater SCR control output uout (t)=C (t) × u (t).
8. the oven temperature control method of multi-point temp according to claim 5 sensing is it is characterised in that described beginning
Radiating, specially：
Close heater, start blower fan, the startup of blower fan can start left and right blower fan according to the time interval switching of program setting
Or entrance manual mode starts left and right blower fan simultaneously.
9. a kind of oven temperature based on multi-point temp sensing for realizing the method any one of claim 1 to 8
Control system is it is characterised in that described system includes：
Baking oven, for heating product, described baking oven includes heater, at least 2 blower fans in left and right and at least 3 gas outlets；
Printer, the parameter for setting of printing and monitoring data；
At least 6 temperature sensors, for measuring the temperature of point for measuring temperature, described point for measuring temperature is corresponded with temperature sensor；
Computer, for setting the parameter controlling for oven temperature, is controlled to heating process, and described computer is respectively
It is connected with described baking oven, printer and temperature sensor.
10. the oven temperature control system of multi-point temp according to claim 9 sensing is it is characterised in that described meter
Calculation machine also includes display, and described display is used for staff's display system working condition.
The oven temperature control system of 11. multi-point temp sensings according to claim 9 is it is characterised in that described is
System also includes two-dimensional code scanning rifle, and described two-dimensional code scanning rifle is used for obtaining the product type of heated product.
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