CN104038221A - Electric heater and method for carrying out fault identification on AD input device of electric heater - Google Patents
Electric heater and method for carrying out fault identification on AD input device of electric heater Download PDFInfo
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- CN104038221A CN104038221A CN201310074173.3A CN201310074173A CN104038221A CN 104038221 A CN104038221 A CN 104038221A CN 201310074173 A CN201310074173 A CN 201310074173A CN 104038221 A CN104038221 A CN 104038221A
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Abstract
The invention brings forward a method for carrying out fault identification on an AD input device of an electric heater. The method comprises the following steps that: a controller in an electric heater carries out accumulated timing on heating time of the electric heater and carries out continuous timing on unheated time of the electric heater; when heating time of the accumulated timing is larger than or equal to first preset time and unheated time of the continuous timing is less than second preset time, the controller obtains a maximum detection value and a minimum detection value within the heating time and the unheated time of the electric heater, wherein the maximum detection value and the minimum detection value are outputted by the AD input device; and whether a difference value between the maximum detection value and the minimum detection value is larger than or equal to a preset threshold value is determined; if so, the AD input device is determined to be normal; and if not, the AD input device is determined to be in a fault state. According to the invention, with the method, fault identification can be carried out on the whole AD input device can be carried out; and the application range is wide. In addition, the invention also puts forward an electric heater.
Description
Technical field
The present invention relates to electric-heating technology field, particularly a kind of electric heater and a kind of method of the AD input unit of electric heater being carried out to Fault Identification.
Background technology
At present, for AD(Analog-Digital, analog digital) fault recognition method that true property is intended in signal input mainly contains two schemes, wherein, intend true property and refer to the particular community having in product running, i.e. the variation of output of products amount can follow certain input variable to change.Above-mentioned two schemes is as follows:
Scheme one, compare, and then whether the detected AD module of identification breaks down by detected value and the known reference value with reference to output output that the detected AD module detecting is obtained.As shown in Figure 1, IO1 is with reference to output, output known electric parameter " 0 " or " 1 ", AD1 module is detected AD module, and AD1 module carries out after AD conversion obtaining a detected value, product I C(Integrated Circuit, integrated circuit) by the known electric parameter that relatively this detected value and IO1 end are exported, judge whether these two parameters coincide, if misfitted, judgement is detected AD module failure.Under normal circumstances, product I C has the particular community that meets its designing requirement, and the variation of output of products amount can be followed certain input variable to change and intend true property.If the sensor module circuitry being connected with AD1 module breaks down, even if also can cause occurring that output of products quantitative changeization does not still have corresponding input to change.For example, the IO1 of product I C output one adds heat as shown in Figure 1, under normal condition, by AD1 module, can obtain an input variable quantity, if but the sensor module circuitry being connected with AD1 module breaks down, this input variable quantity will there will be extremely, and this Novel presentation is that the detected value being undertaken after AD conversion by AD1 module can not change conventionally.
Therefore, the shortcoming that scheme one exists is, whether the AD1 module in can only testing product IC is normal, but whether fail to identify connected sensor module circuitry normal.
Scheme two, in product running, within a period of time, for example detect the detected value that detected AD module converts goes out in 10S, and its specific change rule corresponding with pre-stored in product I C and particular community is compared, and then whether identify the input module of product normal.As shown in Figure 2, for example output of products one adds heat, in product running, at certain hour, for example in 10S, detect the detected value that AD1 module converts goes out, formation time-temperature curve D, curve D is compared with corresponding specific change law curve D1 and the D2 that are pre-stored in product I C, if curve D between curve D 1 and curve D 2, judges sensor module circuitry and detected AD1 module normal operation that the input module of product is connected with detected AD1 module.
But, the shortcoming that scheme two exists is, although whether can identify the input module of product normal, but there is limitation, be only applicable to input variable and there is the fixedly product of Changing Pattern, not fixedly rule, for example curve D in Fig. 23 of its input variable while moving as fruit product, this scheme is no longer applicable, and accommodation is smaller.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technological deficiency.
For this reason, first object of the present invention is to propose a kind of method of the AD input unit of electric heater being carried out to Fault Identification, and the method can be carried out Fault Identification to whole AD input unit, and applied widely.Second object of the present invention is to propose a kind of electric heater.
For achieving the above object, a kind of method of the AD input unit of electric heater being carried out to Fault Identification that first aspect present invention embodiment proposes, comprise the steps: that controller in electric heater is to adding up timing the heating time of described electric heater, and to carrying out continuous timing the not heating time of described electric heater; The heating time of accumulative total timing be more than or equal to the first Preset Time and continuously timing be not less than the second Preset Time heating time time, described controller obtains the heating time of described electric heater and maximum detected value and minimum detection value that the described AD input unit in heating time is not exported; Judge whether the difference between described maximum detected value and minimum detection value is more than or equal to predetermined threshold value; If so, judge that described AD input unit is normal; If not, judge described AD input unit fault.
According to the embodiment of the present invention, the AD input unit of electric heater is carried out to the method for Fault Identification, by detecting electric heater accumulation heating the first Preset Time and not being less than heating time after the second Preset Time continuously, according to the variation of the detected value of AD input unit output, AD input unit is carried out to Fault Identification, expand Fault Identification scope, improved the fail safe of electric heater.And can be applied to have the product of on-fixed input rule, applied range.
Further, in one embodiment of the invention, described AD input unit comprises detection module and AD modular converter, and described AD modular converter is arranged among described controller.Wherein, described detection module detects the running parameter of described electric heater to generate detection signal, and described AD modular converter converts described detection signal to digital signal that described controller can be identified.
The AD input unit to electric heater of the embodiment of the present invention carries out the method for Fault Identification can carry out Fault Identification to detection module, can carry out Fault Identification to AD modular converter again, has expanded Fault Identification scope.
In one embodiment of the invention, described controller comprises the first timer and the second timer, described the first timer is for to add up timing the heating time of described electric heater, and described the second timer is used for and to carrying out continuous timing the not heating time of described electric heater.
In one embodiment of the invention, said method also comprises: when be less than described the first Preset Time the heating time of accumulative total timing, described controller records described maximum detected value and minimum detection value, and by described the second timer zero clearing.
In another embodiment of the present invention, said method also comprises: continuous timing be not more than or equal to described the second Preset Time heating time time, the first timer, described maximum detected value and minimum detection value described in described controller zero clearing.
For achieving the above object, a second aspect of the present invention embodiment proposes a kind of electric heater, comprise AD input unit and controller, wherein, described AD input unit comprises detection module and AD modular converter, described AD modular converter is arranged among described controller, and described detection module detects the running parameter of described electric heater to generate detection signal, and described AD modular converter converts described detection signal to digital signal that described controller can be identified; Described controller, for to adding up timing the heating time of described electric heater and to carrying out continuous timing the not heating time of described electric heater, and the heating time of accumulative total timing be more than or equal to the first Preset Time and continuously timing be not less than the second Preset Time heating time time obtain the heating time of described electric heater and maximum detected value and minimum detection value that the described AD input unit in heating time is not exported, and judge according to the difference between described maximum detected value and minimum detection value whether described AD input unit exists fault.
According to the electric heater of the embodiment of the present invention, by controller, passed through to compare the size of the maximum detected value of AD input unit and the difference of minimum detection value, can carry out Fault Identification to the detection module of AD input unit and AD modular converter, can expand Fault Identification scope, improve the Fault Identification ability of AD input unit, and improved reliability, can effectively prevent the safety problem causing due to AD input unit fault.In addition, the electric heater that the present invention proposes, can be applied to input variable without the fixing product of rule, applied range.
In one embodiment of the invention, described controller judges that described AD input unit is normal while being also more than or equal to predetermined threshold value for the difference between described maximum detected value and minimum detection value, judges described AD input unit fault when described difference is less than described predetermined threshold value.
In one embodiment of the invention, described controller also comprises the first timer and the second timer, described the first timer is for to add up timing the heating time of described electric heater, and described the second timer is used for and to carrying out continuous timing the not heating time of described electric heater.
In one embodiment of the invention, described controller records described maximum detected value and minimum detection value while being also less than described the first Preset Time for the heating time in accumulative total timing, and by described the second timer zero clearing, and continuous timing be not more than or equal to described the second Preset Time heating time time zero clearing described in the first timer, described maximum detected value and minimum detection value.
The aspect that the present invention is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
Fig. 1 is the schematic diagram of signal comparison in the product in the scheme one of prior art;
Fig. 2 is Time-temperature law curve figure in the scheme two of prior art;
Fig. 3 is for carrying out the flow chart of the method for Fault Identification according to the embodiment of the present invention to the AD input unit of electric heater;
Fig. 4 is according to the schematic diagram of the modular structure of the electric heater of the embodiment of the present invention;
Fig. 5 is the electrical block diagram of detection module according to an embodiment of the invention;
Fig. 6 is the schematic diagram that the first timer according to an embodiment of the invention and the second timer carry out the Time-temperature of timing;
Fig. 7 is the flow chart of the concrete steps of the AD input unit to the electric heater according to an embodiment of the invention method of carrying out Fault Identification.
Reference numeral:
Detection module 401, AD modular converter 402, controller 403, AD input unit 404, the first timer 405 and the second timer 406, thermistor RT, diode D1 and diode D2, resistance R 1 and resistance R 2.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
Disclosing below provides many different embodiment or example to be used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and object clearly, itself do not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique the invention provides and the example of material, but those of ordinary skills can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, First Characteristic described below Second Characteristic it " on " structure can comprise that the first and second Characteristics creations are for the direct embodiment of contact, also can comprise the embodiment of other Characteristics creation between the first and second features, such the first and second features may not be direct contacts.
In description of the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be to be directly connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
With reference to description and accompanying drawing below, these and other aspects of embodiments of the invention will be known.These describe and accompanying drawing in, specifically disclose some specific implementations in embodiments of the invention, represent to implement some modes of the principle of embodiments of the invention, still should be appreciated that the scope of embodiments of the invention is not limited.On the contrary, embodiments of the invention comprise spirit and all changes within the scope of intension, modification and the equivalent that falls into additional claims.
A kind of method of the AD input unit of electric heater being carried out to Fault Identification proposing according to first aspect present invention embodiment is described with reference to the accompanying drawings.
As shown in Figure 3, the embodiment of the present invention the AD input unit of electric heater is carried out to the method for Fault Identification, comprise the steps:
S1, the controller in electric heater is to adding up timing the heating time of electric heater, and to carrying out continuous timing the not heating time of electric heater.
First, to carry out the AD input unit of Fault Identification in the method for the embodiment of the present invention, be briefly described, in an embodiment of the present invention, as shown in Figure 4, the AD input unit 404 of electric heater comprises detection module 401 and AD modular converter 402, and AD modular converter 402 is arranged among controller 403.AD input unit 404 is carried out to Fault Identification and detection module 401 and AD modular converter 402 are all carried out to Fault Identification.Wherein, detection module 401 detects the running parameter of electric heater to generate detection signal, and AD modular converter 402 converts detection signal to digital signal that controller 403 can be identified, and this digital signal can be temperature value, magnitude of voltage, force value etc.In a concrete example of the present invention, as shown in Figure 5, detection module 401 can be sensing circuit, and this sensing circuit mainly comprises thermistor RT, diode D1, D2 and resistance R 1 and resistance R 2.Thermistor RT detected temperatures value, by sensing circuit, temperature value is changed into analog electrical signal, and by the AD conversion module 402 that this analog signal is input to controller 403, be the AD modular converter 402 AD1 module for example of AD input unit 404, AD1 module is carried out ADC processing, this analog signal is converted into the digital signal that controller 403 can be identified, controller 403 compares processing to this digital signal, thereby realizes the Fault Identification to whole AD input unit 404.
In one embodiment of the invention, as shown in Figure 4, the controller 403 of electric heater comprises the first timer 405 and the second timer 406, the first timer 405 is for to adding up timing the heating time of electric heater, the second timer 406 for and to carrying out continuous timing the not heating time of electric heater, record the detected value of AD input unit 404, such as thinking temperature value, magnitude of voltage, force value etc. simultaneously.When electric heater heats, the first timer 405 starts timing to adding up timing the heating time of electric heater, and when electric heater heats, the second timer 406 carries out timing to carrying out continuous timing the not heating time of electric heater.Particularly, for example as shown in Figure 6,0～t1 in the time electric heater heat, the first timer 405 carries out timing, and timing time is t1, and, when be less than the first preset time T 1 heating time of the first timer 405 accumulative total timing, controller 403 detects maximum detected value Tmax and the minimum detection value Tmin of AD input units 404, and by the second timer 406 zero clearings, and Tmax herein and Tmin are corresponding to the digital signal of AD input unit 404 input variables.In like manner, within t2～t3 time, electric heater heats, primary heater 405 carries out timing, timing time is t3-t2, the time of the first timer 405 cumulative records is t1+(t3-t2) be made as ton second, if t1+(t3-t2) be less than the first preset time T 1 for example 7 minutes, at upper once electric heater, heat, the first timer 405 is proceeded accumulative total timing, for example the first timer 405 accumulation timing in t4～t5 time as shown in Figure 6, timing time is t5-t4, in like manner, within t6～t7 time, the first timer 405 adds up timing, timing time is t7-t6, now the first timer 405 is accumulated timing time ton=t1+(t3-t2)+(t5-t4)+(t7-t6), when ton is more than or equal to T1, enter step S2.As shown in Figure 6, within t1～t2 time, electric heater heats, the second timer 406 carries out continuous timing, timing time is that t2-t1 is made as toff second, the second timer 406 continuous timing be not more than or equal to the second preset time T 2 heating time time, controller 403 zero clearing the first timers 405, maximum detected value Tmax and minimum detection value Tmin, for example, if toff is more than or equal to the second preset time T 2 for example 60 minutes, the first timer 405, the equal zero clearing of Tmax and Tmin, if toff is less than the second preset time T 2 60 minutes, the second timer 406 zero clearings, when electric heater does not heat next time, the second timer 406 re-starts timing, for example, in the t3～t4 time in Fig. 6, in t5～t6 time, the second timer 406 all carries out independently reclocking, and within t7～t8 time, the continuous timing time of the second timer 406 is toff=t8-t7, toff is more than or equal to the second preset time T 2 60 minutes, Tmax and the zero clearing of Tmin value of the first timer 405 countings and record, carry out again the timing of next circulation, so circulation.
S2, the heating time of accumulative total timing be more than or equal to the first Preset Time and continuously timing be not less than the second Preset Time heating time time, controller obtains in heating time of electric heater and maximum detected value and the minimum detection value of the not AD input unit output in heating time.
In one embodiment of the invention, by step S1, obtained the time that adds up timing heating time of 405 pairs of heaters of the first timer, and 406 pairs of heaters of the second timer do not carry out the time of continuous timing heating time, in the heating time of accumulative total timing, being more than or equal to the first Preset Time 7 minutes is for example that ton is more than or equal to 7 minutes that is the accumulation of electric heater is more than or equal to 7 minutes heating time, and the laser heating time that is less than the second Preset Time the not heating time of the second timer 406 continuous timing and 60 minutes is for example electric heater is while being less than 60 minutes, controller 403 obtains in heating time of electric heater and maximum detected value Tmax and the minimum detection value Tmin of not AD input unit 403 outputs in heating time, enter step S3.
S3, judges whether the difference between maximum detected value and minimum detection value is more than or equal to predetermined threshold value.
By step S2, obtained maximum detected value Tmax and the minimum detection value Tmin of AD input unit 404, controller 403 by the difference of Tmax and Tmin variable quantity and the predetermined threshold value T of the temperature in the first Preset Time compare, threshold value when wherein predetermined threshold value can be the AD input unit 404 normal work of setting according to the overall performance of electric heater.Example as shown in Figure 6, if detected value is temperature value, constantly obtains minimum value Tmax 0, at t5, constantly obtains maximum detected value Tmax, if controller 403 judgement Tmax-Tmin >=T enter step S4, otherwise enter step S5.
S4, AD input unit is normal.
S5, AD input unit fault.
In sum, in a specific embodiment of the present invention, as shown in Figure 7, the idiographic flow that the AD input unit 404 of electric heater is carried out to Fault Identification comprises the steps:
S701, judges whether electric heater heats.
After starting working, judge that whether electric heater is in heated condition, if electric heater in heated condition, enters step S702, otherwise, enter step S703.
S702, the second counter O reset, the first counter adds up timing ton.
The first counter 405 carries out timing, and establishing timing time is ton, meanwhile, the detected value of the AD input unit 404 that recording controller 403 detects, and 404 pairs of the first timers 405 accumulative total timing times of controller judge, enter step S704.
S703, the second counter carries out continuous timing toff.
At the second counter 406, carry out continuous timing, establishing timing time is toff, and meanwhile, the timing time of 403 pairs of the second counters 406 of controller judges, enters step S709.
S704, judges whether ton >=T1.
Judge whether the first timer 405 accumulative total timing times are more than or equal to the first preset time T 1, if judgement obtains ton >=T1, the first counter 405 accumulative total timing times are more than or equal to the first Preset Time, enter step S706, otherwise, enter step S705.
S705, records Tmax and Tmin value, and the second timer zero clearing.
S706, judges whether Tmax-Tmin >=T.
Judge the maximum detected value of AD input unit 404 and the difference of minimum detection value whether be more than or equal to predetermined threshold value for example 3 be detected value, judge whether Tmax-Tmin is more than or equal to 3 detected values.If Tmax-Tmin >=T, enters step S707, otherwise Tmax-Tmin<T, enters step S708.
S707, confirms that AD input unit is normal.
S708, confirms that AD input unit is abnormal.
S709, judges whether toff >=T2.
Judge whether the continuous timing time of the second timer 406 is more than or equal to the second preset time T 2 for example 60 minutes, if toff >=T2 is confirmed in judgement, enter step S710, otherwise, finish.
S710, the first timer, Tmax value and the zero clearing of Tmin value.
In sum, the embodiment of the present invention the AD input unit of electric heater is carried out to the method for Fault Identification, the basic principle of foundation remains intends true property: according to exporting change electric heater accumulation heating a period of time for example, must have certain input feedback and change the variation that is for example heated object temperature, according to the variation of output variable, determine whether to exist the variation of corresponding input variable, if there is no input variable changes or changes not obvious, judges that AD input unit 404 breaks down.Thereby effectively improve the Fault Identification ability of AD input unit 404, prevent because AD input unit 404 breaks down the safety problem causing because of continuous heating that causes such as overheated on fire etc.
In one embodiment of the invention; the AD input unit to electric heater of the embodiment of the present invention can be carried out to the method for Fault Identification carries out to control the form of software; can increase the object that Thermal Cutoffs can reach effective safeguard protection, thereby reduce cost.
In sum, according to the embodiment of the present invention, the AD input unit of electric heater is carried out to the method for Fault Identification, by detecting electric heater accumulation heating the first Preset Time and not being less than heating time after the second Preset Time continuously, according to the detected value of AD input unit output, AD input unit is carried out to Fault Identification, expand Fault Identification scope, improved the fail safe of electric heater.And the product that can be applied to have on-fixed input rule, applied range, in addition, has reduced cost.
4 a kind of electric heater proposing according to second aspect present invention embodiment is described with reference to the accompanying drawings.
As shown in Figure 4, the electric heater of the embodiment of the present invention comprises AD input unit 404 and controller 403, wherein, AD input unit 404 comprises detection module 401 and AD modular converter 402, AD modular converter 402 is arranged among controller 403, detection module 401 detects the running parameter of electric heater to generate detection signal, AD modular converter 402 converts detection signal to digital signal that controller 403 can be identified, this digital signal is the input variable of corresponding A D input unit 404, can be temperature value, magnitude of voltage, atmospheric pressure value etc.Controller 403 is for to adding up timing the heating time of electric heater and to carrying out continuous timing the not heating time of electric heater, and the heating time of accumulative total timing be more than or equal to the first Preset Time and continuously timing be not less than the second Preset Time heating time time obtain the heating time of electric heater and maximum detected value and minimum detection value that the AD input unit 404 in heating time is not exported, and judge according to the difference between maximum detected value and minimum detection value whether AD input unit 404 exists fault.
In a concrete example of the present invention, as shown in Figure 5, detection module 401 can be sensing circuit, and this sensing circuit is mainly comprised of thermistor RT, diode D1, D2 and resistance R 1 and resistance R 2.When electric heater heats, thermistor RT detected temperatures value, by sensing circuit, temperature value is changed into analog electrical signal, and by the AD conversion module 402 that this analog signal is input to controller 403, be the AD modular converter 402 AD1 module for example of AD input unit 404, AD1 module is carried out ADC processing, this analog signal is converted into the digital signal that controller 403 can be identified, and change rule or unchanged rule of the measurer that this digital signal represents all can, controller 403 compares processing to this digital signal, thereby realize the Fault Identification to whole AD input unit 404.
Further, in one embodiment of the invention, as shown in Figure 4, controller 403 also comprises the first timer 405 and the second timer 406, the first timer 405 is for to adding up timing the heating time of electric heater, the second timer 406 for and to carrying out continuous timing the not heating time of electric heater.When electric heater heats, the first timer 405 starts timing to adding up timing the heating time of electric heater, and when electric heater heats, the second timer 406 carries out timing to carrying out continuous timing the not heating time of electric heater.Particularly, for example as shown in Figure 6,0～t1 in the time electric heater heat, the first timer 405 carries out timing, and timing time is t1, and, when be less than the first preset time T 1 heating time of the first timer 405 accumulative total timing, controller 403 detects maximum detected value Tmax and the minimum detection value Tmin of AD input unit 404 outputs, and by the second timer 406 zero clearings, Tmax herein and Tmin are the digital signal of the input variable of AD input unit 404.In like manner, within t2～t3 time, electric heater heats, primary heater 405 carries out timing, timing time is t3-t2, the time of the first timer 405 cumulative records is t1+(t3-t2) be made as ton second, if t1+(t3-t2) be less than the first preset time T 1 for example 7 minutes, at upper once electric heater, heat, the first timer 405 is proceeded accumulative total timing, for example the first timer 405 accumulation timing in t4～t5 time as shown in Figure 6, timing time is t5-t4, in like manner, within t6～t7 time, the first timer 405 adds up timing, timing time is t7-t6, now the first timer 405 is accumulated timing time ton=t1+(t3-t2)+(t5-t4)+(t7-t6).As shown in Figure 6, within t1～t2 time, electric heater heats, the second timer 406 carries out continuous timing, timing time is that t2-t1 is made as toff second, the second timer 406 continuous timing be not more than or equal to the second preset time T 2 heating time time, controller 403 zero clearing the first timers 405, maximum detected value Tmax and minimum detection value Tmin, for example, if controller 403 judgement toff are more than or equal to the second preset time T 2 for example 60 minutes, control the first timer 405 countings, the equal zero clearing of Tmax and Tmin, if controller 403 judgement toff are less than the second preset time T 2 60 minutes, control the second timer 406 zero clearings, when electric heater does not heat next time, the second timer 406 re-starts timing, for example, in the t3～t4 time in Fig. 6, in t5～t6 time, the second timer 406 all carries out independently reclocking, and within t7～t8 time, the continuous timing time of the second timer 406 is toff=t8-t7, when controller, 403 judgement toff are more than or equal to the second preset time T 2 60 minutes, control Tmax and the zero clearing of Tmin value of the first timer 405 countings and record, carry out again the timing of next circulation, so circulation timing.
In one embodiment of the invention, when the first timer 405 accumulative total timing times are greater than the first Preset Time, within 7 minutes, be for example that ton is more than or equal to 7 minutes that is the accumulation of electric heater is more than or equal to 7 minutes heating time, and the laser heating time that is less than the second Preset Time the not heating time of the second timer 406 continuous timing and 60 minutes is for example electric heater is while being less than 60 minutes, controller 403 obtains in heating time of electric heater and maximum detected value Tmax and the minimum detection value Tmin of not AD input unit 404 outputs in heating time.When the difference between maximum detected value and minimum detection value is more than or equal to predetermined threshold value T, controller 403 judgement AD input units 404 are normal, when difference is less than predetermined threshold value T, controller 403 judgement AD input unit 404 faults, and the output variable of AD input unit 404 has Changing Pattern or unchanged rule, controller 403 all can obtain its maximum detected value and minimum detection value.Particularly, controller 403 by the difference of Tmax and Tmin variable quantity and the predetermined threshold value T of the detected value in the first Preset Time compare, threshold value when wherein predetermined threshold value can be the AD input unit 404 normal work of setting according to the overall performance attribute of electric heater.For example as shown in Figure 6, if input value is temperature value, controller 403 constantly detects and obtains minimum value detected value Tmin 0, at t5, constantly obtain maximum detected value Tmax, if controller 403 judgement Tmax-Tmin >=T, AD input unit 404 is working properly, if Tmax-Tmin<T, controller 403 judgement AD input units 404 break down.
In sum, according to the electric heater of the embodiment of the present invention, by controller, passed through to compare the size of the maximum detected value of AD input unit and the difference of minimum detection value, can carry out Fault Identification to the detection module of AD input unit and AD modular converter, improved the Fault Identification ability of AD input unit, expand fault detect scope, improved the reliability of electric heater, can effectively prevent the safety problem causing due to AD input unit fault.In addition, the electric heater that the present invention proposes, can be applied to input variable without the fixing product of rule, applied range.
In flow chart or any process of otherwise describing at this or method describe and can be understood to, represent to comprise that one or more is for realizing module, fragment or the part of code of executable instruction of the step of specific logical function or process, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can be not according to order shown or that discuss, comprise according to related function by the mode of basic while or by contrary order, carry out function, this should be understood by embodiments of the invention person of ordinary skill in the field.
The logic and/or the step that in flow chart, represent or otherwise describe at this, for example, can be considered to for realizing the sequencing list of the executable instruction of logic function, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise that the system of processor or other can and carry out the system of instruction from instruction execution system, device or equipment instruction fetch), use, or use in conjunction with these instruction execution systems, device or equipment.With regard to this specification, " computer-readable medium " can be anyly can comprise, storage, communication, propagation or transmission procedure be for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically of computer-readable medium (non-exhaustive list) comprises following: the electrical connection section (electronic installation) with one or more wirings, portable computer diskette box (magnetic device), random-access memory (ram), read-only memory (ROM), the erasable read-only memory (EPROM or flash memory) of editing, fiber device, and portable optic disk read-only memory (CDROM).In addition, computer-readable medium can be even paper or other the suitable medium that can print described program thereon, because can be for example by paper or other media be carried out to optical scanner, then edit, decipher or process in electronics mode and obtain described program with other suitable methods if desired, be then stored in computer storage.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, a plurality of steps or method can realize with being stored in memory and by software or the firmware of suitable instruction execution system execution.For example, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: have for data-signal being realized to the discrete logic of the logic gates of logic function, the application-specific integrated circuit (ASIC) with suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is to come the hardware that instruction is relevant to complete by program, described program can be stored in a kind of computer-readable recording medium, this program, when carrying out, comprises step of embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, can be also that the independent physics of unit exists, and also can be integrated in a module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.If described integrated module usings that the form of software function module realizes and during as production marketing independently or use, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is by claims and be equal to and limit.
Claims (10)
1. the AD input unit of electric heater is carried out to a method for Fault Identification, it is characterized in that, comprise the steps:
Controller in electric heater is to adding up timing the heating time of described electric heater, and to carrying out continuous timing the not heating time of described electric heater;
The heating time of accumulative total timing be more than or equal to the first Preset Time and continuously timing be not less than the second Preset Time heating time time, described controller obtains in heating time of described electric heater and maximum detected value and the minimum detection value of the not described AD input unit output in heating time;
Judge whether the difference between described maximum detected value and minimum detection value is more than or equal to predetermined threshold value;
If so, judge that described AD input unit is normal;
If not, judge described AD input unit fault.
2. method of the AD input unit of electric heater being carried out to Fault Identification as claimed in claim 1, is characterized in that: described AD input unit comprises detection module and AD modular converter, and described AD modular converter is arranged among described controller.
3. method of the AD input unit of electric heater being carried out to Fault Identification as claimed in claim 2, it is characterized in that: described detection module detects the running parameter of described electric heater to generate detection signal, and described AD modular converter converts described detection signal to digital signal that described controller can be identified.
4. method of the AD input unit of electric heater being carried out to Fault Identification as claimed in claim 1, it is characterized in that: described controller comprises the first timer and the second timer, described the first timer is for to add up timing the heating time of described electric heater, and described the second timer is used for and to carrying out continuous timing the not heating time of described electric heater.
5. method of the AD input unit of electric heater being carried out to Fault Identification as claimed in claim 4, is characterized in that, also comprises:
When be less than described the first Preset Time the heating time of accumulative total timing, described controller detects described maximum detected value and minimum detection value, and by the second timer zero clearing.
6. method of the AD input unit of electric heater being carried out to Fault Identification as claimed in claim 4, is characterized in that, also comprises:
Continuous timing be not more than or equal to described the second Preset Time heating time time, the first timer, described maximum detected value and minimum detection value described in described controller zero clearing.
7. an electric heater, is characterized in that: comprise AD input unit and controller, wherein,
Described AD input unit comprises detection module and AD modular converter, described AD modular converter is arranged among described controller, described detection module detects the running parameter of described electric heater to generate detection signal, and described AD modular converter converts described detection signal to digital signal that described controller can be identified;
Described controller, for to adding up timing the heating time of described electric heater and to carrying out continuous timing the not heating time of described electric heater, and the heating time of accumulative total timing be more than or equal to the first Preset Time and continuously timing be not less than the second Preset Time heating time time obtain the heating time of described electric heater and maximum detected value and minimum detection value that the described AD input unit in heating time is not exported, and judge according to the difference between described maximum detected value and minimum detection value whether described AD input unit exists fault.
8. electric heater as claimed in claim 7, it is characterized in that: described controller judges that described AD input unit is normal while being also more than or equal to predetermined threshold value for the difference between described maximum detected value and minimum detection value, judges described AD input unit fault when described difference is less than described predetermined threshold value.
9. electric heater as claimed in claim 7, it is characterized in that: described controller also comprises the first timer and the second timer, described the first timer is for to add up timing the heating time of described electric heater, and described the second timer is used for and to carrying out continuous timing the not heating time of described electric heater.
10. electric heater as claimed in claim 9, it is characterized in that: described controller records described maximum detected value and minimum detection value while being also less than described the first Preset Time for the heating time in accumulative total timing, and by described the second timer zero clearing, and continuous timing be not more than or equal to described the second Preset Time heating time time zero clearing described in the first timer, described maximum detected value and minimum detection value.
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| CN201310074173.3A CN104038221B (en) | 2013-03-07 | 2013-03-07 | Electric heater and method for carrying out fault identification on AD input device of electric heater |
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| CN104038221B CN104038221B (en) | 2017-04-19 |
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| CN108958208A (en) * | 2017-05-25 | 2018-12-07 | 佛山市顺德区美的电热电器制造有限公司 | The fault recognition method of electric heater and its AD input unit |
| CN109307562A (en) * | 2017-07-28 | 2019-02-05 | 佛山市顺德区美的电热电器制造有限公司 | The detection method of electromagnetic heating system and its thermistor, device |
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| CN102735365A (en) * | 2012-06-25 | 2012-10-17 | 美的集团有限公司 | Ambient temperature detection device and fault judgment method thereof |
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| EP2203726A1 (en) * | 2007-10-11 | 2010-07-07 | Ansaldo Segnalamento Ferroviario S.p.A. | Fail-safe temperature detection device |
| CN102298406A (en) * | 2011-08-24 | 2011-12-28 | 张克勇 | Electric heater and control device thereof |
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| CN104038221B (en) | 2017-04-19 |
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