CN108958208B - Electric heater and fault identification method of AD input device of electric heater - Google Patents
Electric heater and fault identification method of AD input device of electric heater Download PDFInfo
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- CN108958208B CN108958208B CN201710383121.2A CN201710383121A CN108958208B CN 108958208 B CN108958208 B CN 108958208B CN 201710383121 A CN201710383121 A CN 201710383121A CN 108958208 B CN108958208 B CN 108958208B
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract
The invention discloses a fault identification method for an electric heater and an AD input device thereof, which comprises the following steps: when the heating time during the accumulated timing is greater than or equal to a first preset time and the unheated time during the continuous timing is less than a second preset time, comparing a first maximum temperature detection value and a first minimum temperature detection value output by the AD input device; when the difference value of the first maximum temperature detection value and the first minimum temperature detection value is smaller than or equal to a preset threshold value and the total heating time is smaller than or equal to a third preset time, controlling the electric heater to stop heating; when the heating stopping time is greater than or equal to the fourth preset time, comparing a second maximum temperature detection value and a second minimum temperature detection value output by the AD input device in the heating stopping time; and when the difference value of the second maximum temperature detection value and the second minimum temperature detection value is smaller than or equal to a preset threshold value, judging that the AD input device has a fault. The invention improves the accuracy of fault identification.
Description
Technical Field
The invention relates to the field of electric heaters, in particular to an electric heater and a fault identification method of an AD input device of the electric heater.
Background
In the prior art, a method for identifying a fault of an AD input device of an electric heater generally adopts the following identification method: when the electric heater is in a heating state, a controller in the electric heater performs accumulated timing on the heating time of the electric heater and performs continuous timing on the unheated time of the electric heater; when the heating time during accumulated timing is greater than or equal to first preset time and the unheated time during continuous timing is less than second preset time, the controller acquires the maximum temperature detection value and the minimum temperature detection value output by the AD input device of the electric heater during the heating time and the unheated time; and finally, judging whether the AD input device of the electric heater is in failure according to the difference value between the maximum temperature detection value and the minimum temperature detection value output by the AD input device. Specifically, when the difference value between the maximum temperature detection value and the minimum temperature detection value output by the AD input device is greater than or equal to a preset threshold value, judging that the AD input device is normal; and when the difference value between the maximum temperature detection value and the minimum temperature detection value output by the AD input device is smaller than a preset threshold value, judging that the AD input device has a fault.
However, in the method for identifying a fault of the AD input device of the electric heater in the prior art, whether the AD input device of the electric heater has a fault is determined according to a difference value between a maximum temperature detection value and a minimum temperature detection value output by the AD input device in a heating stage of the electric heater, and when a heating amount of the electric heater is small or reaches a boiling point, a variation amount of the temperature detection value output by the AD input device is small, so that the method for identifying a fault of the AD input device of the electric heater in the prior art is prone to cause a misjudgment problem.
Disclosure of Invention
The invention mainly aims to provide a fault identification method for an AD input device of an electric heater, aiming at improving the accuracy of fault identification of the AD input device of the electric heater.
In order to achieve the above object, the present invention provides a fault recognition method of an AD input device of an electric heater, including:
s10, the heating time of the electric heater is counted up, and the total heating time of the electric heater and the unheated time of the electric heater are respectively counted continuously;
s20, when the heating time counted accumulatively is greater than or equal to a first preset time and the unheated time counted continuously is less than a second preset time, comparing a first maximum temperature detection value and a first minimum temperature detection value output by the AD input device of the electric heater in the heating time and the unheated time;
s30, controlling the electric heater to stop heating when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is less than or equal to a preset threshold value and the continuously timed total heating time is less than or equal to a third preset time;
s40, when the heating stop time is longer than or equal to the fourth preset time, comparing the second maximum temperature detection value and the second minimum temperature detection value output by the AD input device during the heating stop time of the electric heater;
and S50, judging the AD input device to be in fault when the difference value of the second maximum temperature detection value and the second minimum temperature detection value is less than or equal to the preset threshold value.
Preferably, the step S40 is followed by:
and S60, when the difference value between the second maximum temperature detection value and the second minimum temperature detection value is larger than the preset threshold value, judging that the AD input device is normal, and controlling the electric heater to recover the normal heating state.
Preferably, the step S20 is followed by:
and S70, when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is larger than the preset threshold value, or the continuously timed total heating time is larger than a third preset time, clearing the cumulatively timed total heating time and the continuously timed total heating time.
Preferably, the step S10 is followed by:
and S80, when the continuously counted unheated time is greater than or equal to a second preset time, clearing the heating time counted accumulatively and the total heating time counted continuously.
Preferably, the step S10 is specifically:
when the electric heater is in a heating state, the heating time of the electric heater is counted up, and the total heating time of the electric heater is continuously counted; when the electric heater is used for heating, clearing the unheated time of the electric heater; continuously timing the unheated time of the electric heater when the electric heater is not heating.
In addition, in order to achieve the above object, the present invention further provides an electric heater, which includes an AD input device and a controller, wherein the controller includes a first timer, a second timer, a third timer, a fourth timer, a data processing module, a control module, and a determination module; wherein:
the AD input device is used for detecting working parameters of the electric heater and inputting a temperature detection value to the controller;
the first timer is used for performing accumulated timing on the heating time of the electric heater;
the second timer is used for continuously timing the unheated time of the electric heater;
the third timer is used for continuously timing the total heating time of the electric heater;
the fourth timer is used for continuously timing the heating stopping time of the electric heater;
the data processing module is used for comparing a first maximum temperature detection value and a first minimum temperature detection value output by the AD input device of the electric heater in the heating time and the non-heating time when the timing time of the first timer is greater than or equal to a first preset time and the timing time of the second timer is less than a second preset time; and comparing a second maximum temperature detection value and a second minimum temperature detection value output by the AD input device during the heating stopping time of the electric heater when the timing time of the fourth timer is greater than or equal to a fourth preset time;
the control module is used for controlling the electric heater to stop heating when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is smaller than or equal to a preset threshold value and the timing time of the third timer is smaller than or equal to a third preset time;
and the judging module is used for judging that the AD input device has a fault when the difference value of the second maximum temperature detection value and the second minimum temperature detection value is less than or equal to the preset threshold value.
Preferably, the determining module is further configured to:
and when the difference value of the second maximum temperature detection value and the second minimum temperature detection value is larger than the preset threshold value, judging that the AD input device is normal, and controlling the electric heater to recover the normal heating state.
Preferably, the control module is further configured to:
and when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is greater than the preset threshold value or the timing time of the third timer is greater than a third preset time, clearing the first timer and the third timer.
Preferably, the control module is further configured to:
and when the timing time of the second timer is greater than a second preset time, clearing the first timer and the third timer.
Preferably, the control module is further configured to:
when the electric heater is in a heating state, controlling the first timer to perform accumulated timing on the heating time of the electric heater, and controlling the third timer to perform continuous timing on the total heating time of the electric heater; when the electric heater is used for heating, the second timer is cleared; and when the electric heater does not heat, controlling the second timer to continuously time the unheated time of the electric heater.
The invention provides a fault identification method of an AD input device of an electric heater, which comprises the following steps: s10, the heating time of the electric heater is counted up, and the total heating time of the electric heater and the unheated time of the electric heater are respectively counted continuously; s20, when the heating time counted accumulatively is greater than or equal to a first preset time and the unheated time counted continuously is less than a second preset time, comparing a first maximum temperature detection value and a first minimum temperature detection value output by the AD input device of the electric heater in the heating time and the unheated time; s30, controlling the electric heater to stop heating when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is less than or equal to a preset threshold value and the continuously timed total heating time is less than or equal to a third preset time; s40, when the heating stop time is longer than or equal to the fourth preset time, comparing the second maximum temperature detection value and the second minimum temperature detection value output by the AD input device during the heating stop time of the electric heater; and S50, judging the AD input device to be in fault when the difference value of the second maximum temperature detection value and the second minimum temperature detection value is less than or equal to the preset threshold value. The invention greatly improves the accuracy of fault identification of the AD input device of the electric heater.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a first embodiment of a fault identification method for an AD input device of an electric heater according to the present invention;
FIG. 2 is a flow chart illustrating a second embodiment of a fault identification method for an AD input device of an electric heater according to the present invention;
FIG. 3 is a flow chart illustrating a third embodiment of a method for identifying a fault in an AD input device of an electric heater according to the present invention;
FIG. 4 is a flow chart illustrating a fourth embodiment of a fault identification method for an AD input device of an electric heater according to the present invention;
FIG. 5 is a diagram illustrating a temperature-time relationship of an electric heater according to a fault recognition method of an AD input device of the electric heater according to the present invention;
fig. 6 is a functional block diagram of an electric heater according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a fault identification method of an AD input device of an electric heater, which is mainly applied to a fault identification and control system of the electric heater and is used for carrying out fault identification on the AD input device of the electric heater so as to prevent the safety problem of the electric heater caused by the fault of the AD input device. In this embodiment, the AD input device of the electric heater includes a detection module and an AD conversion module, wherein the detection module is configured to detect an operating parameter (such as temperature) of the electric heater to generate a detection signal, and the AD conversion module is disposed in the controller of the electric heater and is configured to convert the detection signal generated by the detection module into a digital signal that can be recognized by the controller of the electric heater. In this embodiment, the detection module in the AD input device is a temperature sensing circuit.
Referring to fig. 1, in an embodiment, the method for identifying a fault of the AD input device of the electric heater includes the steps of:
s10, the heating time of the electric heater is counted up, and the total heating time of the electric heater and the unheated time of the electric heater are respectively counted continuously;
s20, when the heating time counted accumulatively is greater than or equal to a first preset time and the unheated time counted continuously is less than a second preset time, comparing a first maximum temperature detection value and a first minimum temperature detection value output by the AD input device of the electric heater in the heating time and the unheated time;
specifically, in this embodiment, when the electric heater is in a heating state, the heating time of the electric heater is cumulatively counted, and the total heating time of the electric heater is continuously counted; when the electric heater is used for heating, clearing the unheated time of the electric heater; continuously timing the unheated time of the electric heater when the electric heater is not heating. Specifically, as shown in fig. 5, fig. 5 is a schematic diagram of a temperature-time correspondence relationship of the electric heater in the method for identifying a fault of the AD input device of the electric heater according to the present invention, where at time 0, the electric heater enters a heating state, and the electric heater is heated in a time period from 0 to t1, then at time 0, cumulative timing of the heating time ton of the electric heater is started (heating time ton1 in the time period from 0 to t1 is t1), and the total heating time of the electric heater is continuously counted while clearing the unheated time toff of the electric heater; during the time period from t1 to t2, the electric heater is not heated, so that at the time t1, the continuous timing of the unheated time toff of the electric heater is started, and the continuously-timed unheated time toff is t2-t 1; in the time period from t2 to t3, the electric heater heats again, the heating time ton2 of the time period is counted, and the counted time ton2 is t3-t2, so that at the time point t3, the heating time ton which is counted up by the electric heater is ton1+ ton2 is t1+ (t3-t 2). It will be appreciated that at time t3, the total heating time, which is continuously timed, is t 3. In this embodiment, if the heating time ton counted up is less than the first preset time ta, the heating time ton of the electric heater is counted up continuously when the electric heater is heated next time, and as shown in fig. 5, the heating time ton3 of the electric heater is t5-t4 in the time period from t4 to t5, and similarly, the heating time ton4 of the electric heater is t7-t6 in the time period from t6 to t7, so that the heating time ton counted up by the electric heater is 1+ ton2+ ton3+ ton4 is t1+ (t3-t2) + (t5-t4) + (t7-t6) at time t7, and the total heating time tz counted up continuously by the electric heater is t 7.
In this embodiment, when the cumulative heating time ton is greater than or equal to the first preset time ta and the continuous unheated time toff is less than the second preset time tb, the process proceeds to step S20. As shown in fig. 5, the electric heater is not heated in the time period from t1 to t2, and therefore, it is necessary to continuously time the unheated time toff of the electric heater, which is t2 to t 1. In this embodiment, if the continuously counted unheated time toff is less than the second preset time tb, the unheated time toff of the electric heater needs to be cleared every time the electric heater is heated, as shown in fig. 5, the unheated time toff of the electric heater needs to be cleared at times t2, t4, and t6, that is, the unheated time toff of the electric heater needs to be continuously counted again when the electric heater is next unheated. As shown in fig. 5, the unheated time toff of the electric heater needs to be re-timed in the time period t3-t 4 and in the time period t5-t 6.
It is understood that the time ranges of the first preset time ta and the second preset time tb may be set as required. In this embodiment, the first preset time ta is greater than or equal to 4 minutes and less than or equal to 6 minutes, and the second preset time tb is greater than or equal to 60 minutes and less than or equal to 65 minutes. Preferably, in this embodiment, the first preset time ta is 4 minutes, and the second preset time tb is 60 minutes.
In this embodiment, when the heating time ton counted up is equal to or longer than the first preset time ta and the unheated time toff counted continuously is shorter than the second preset time tb, the maximum temperature detection value and the minimum temperature detection value output by the AD input device during the heating time and the unheated time of the electric heater are compared. As shown in fig. 5, assuming that the heating time ton counted up is greater than or equal to the first preset time ta at time t7 and the unheated time toff counted up continuously is less than the second preset time tb, the present embodiment compares the first maximum temperature detection value and the first minimum temperature detection value outputted by the AD input device during time t7 at time t7, where the first maximum temperature detection value is Tmax1 and the first minimum temperature detection value is Tmin1 in the present embodiment. It should be noted that Tmax1 and Tmin1 correspond to digital signals output by the AD input device.
S30, controlling the electric heater to stop heating when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is less than or equal to a preset threshold value and the continuously timed total heating time is less than or equal to a third preset time;
s40, when the heating stop time is longer than or equal to the fourth preset time, comparing the second maximum temperature detection value and the second minimum temperature detection value output by the AD input device during the heating stop time of the electric heater;
and S50, judging the AD input device to be in fault when the difference value of the second maximum temperature detection value and the second minimum temperature detection value is less than or equal to the preset threshold value.
Specifically, as shown in fig. 5, assuming that the difference between the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1 output by the AD input device at time T7 is less than or equal to a preset threshold value T (i.e., Tmax1-Tmin1 ≦ T), and when the total heating time tz continuously counted at time T7 is less than or equal to a third preset time tc (i.e., tz ≦ tc), the electric heater is controlled to stop heating, and the stop heating time tg of the electric heater is continuously counted. In the embodiment, when the heating stop time tg is greater than or equal to a fourth preset time td (i.e. tg is greater than or equal to td), the maximum temperature detection value and the minimum temperature detection value output by the AD input device during the heating stop period of the electric heater are compared. In the present embodiment, the maximum temperature detection value and the minimum temperature detection value output by the AD input device when the heating stop time tg is equal to or longer than td are referred to as a second maximum temperature detection value and a second minimum temperature detection value. As shown in fig. 5, assuming that the heating stop time tg is not less than td at time t8, the second maximum temperature detection value output by the AD input device is Tmax2, and the second minimum temperature detection value output by the AD input device is Tmin 2. Then, it is determined whether the AD input device has a fault according to the difference between the second maximum temperature detection value Tmax2 and the second minimum temperature detection value Tmin2, that is, whether the AD input device of the electric heater has a fault according to the difference between the maximum temperature detection value and the minimum temperature detection value output by the AD input device during the heating stop period of the electric heater in the embodiment. Specifically, as shown in fig. 5, if the difference between the second maximum temperature detection value Tmax2 and the second minimum temperature detection value Tmin2 at time T8 is less than or equal to the preset threshold value T (i.e., when Tmax2-Tmin2 ≦ T), it is determined that the AD input device of the electric heater is faulty, and an alarm signal is issued.
It is understood that the range of the preset threshold T, the third preset time tc and the fourth preset time td may be set as required. In this embodiment, the range of the preset threshold T is greater than or equal to 1 AD value and less than or equal to 2 AD values, the time range of the third preset time tc is greater than or equal to 20 minutes and less than or equal to 25 minutes, and the time range of the fourth preset time td is greater than or equal to 25 minutes and less than or equal to 30 minutes. Preferably, in this embodiment, the preset threshold T is 1 AD value, the third preset time tc is 20 minutes, and the fourth preset time td is 25 minutes.
In the method for identifying the fault of the AD input device of the electric heater, firstly, the heating time ton of the electric heater is counted up, and the total heating time tz of the electric heater and the unheated time toff of the electric heater are respectively and continuously counted; then, when the heating time ton counted in an accumulated way is greater than or equal to a first preset time ta (namely ton is greater than or equal to ta) and the unheated time toff counted in a continuous way is less than a second preset time tb (namely toff < tb), comparing a first maximum temperature detection value Tmax1 and a first minimum temperature detection value Tmin1 output by the AD input device during the heating time and the unheated time of the electric heater; when the difference value of the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1 is smaller than or equal to a preset threshold value (namely Tmax1-Tmin1 is smaller than or equal to T) and the continuously timed total heating time tz is smaller than or equal to a third preset time (namely tz is smaller than or equal to tc), controlling the electric heater to stop heating and continuously timing the stop heating time tg of the electric heater; when the heating stop time tg is greater than or equal to a fourth preset time td (namely tg is greater than or equal to td), comparing a second maximum temperature detection value Tmax2 and a second minimum temperature detection value Tmin2 output by the AD input device during the heating stop time of the electric heater; finally, when the difference between the second maximum temperature detection value Tmax2 and the second minimum temperature detection value Tmin2 is less than or equal to the preset threshold value T (i.e., Tmax2-Tmin2 ≦ T), it is determined that the AD input device is malfunctioning. Compared with the prior art method for judging whether the AD input device of the electric heater fails according to the difference value between the maximum temperature detection value Tmax2 and the minimum temperature detection value Tmin2 output by the AD input device in the heating stopping stage of the electric heater, the method for identifying the fault of the AD input device of the electric heater can avoid the problem of misjudgment caused by small variation of the temperature detection value output by the AD input device after the heating amount of the electric heater is small or the heating temperature reaches the boiling point, thereby improving the accuracy of fault identification of the AD input device of the electric heater, and effectively preventing the AD input device of the electric heater from continuously heating due to the fault Causing safety problems such as overheating, fire, etc.
Further, referring to fig. 2, based on the first embodiment of the method for identifying a fault of the AD input device of the electric heater of the present invention, in the second embodiment of the method for identifying a fault of the AD input device of the electric heater of the present invention, the step S40 is followed by the steps of:
and S60, when the difference value between the second maximum temperature detection value and the second minimum temperature detection value is larger than the preset threshold value, judging that the AD input device is normal, and controlling the electric heater to recover the normal heating state.
Specifically, as shown in fig. 5, if the difference between the second maximum temperature detection value Tmax2 and the second minimum temperature detection value Tmin2 at time T8 is greater than the preset threshold value T (i.e., Tmax2-Tmin2> T), it is determined that the AD input device is normal, and the electric heater is controlled to return to the normal heating state.
Compared with the method for judging whether the AD input device of the electric heater fails or not according to the difference value between the maximum temperature detection value and the minimum temperature detection value output by the AD input device in the heating stage of the electric heater in the prior art, the fault identification method of the AD input device of the electric heater can avoid the problem of misjudgment caused by small variation of the temperature detection value output by the AD input device after the heating amount of the electric heater is small or the heating amount reaches the boiling point, thereby improving the accuracy of fault identification of the AD input device of the electric heater, and effectively preventing the safety problem caused by continuous heating, such as overheating and fire, caused by the fact that the AD input device of the electric heater fails.
Further, referring to fig. 3, based on the second embodiment of the method for identifying a fault of the AD input device of the electric heater of the present invention, in the third embodiment of the method for identifying a fault of the AD input device of the electric heater of the present invention, after the step S20, the method further includes:
and S70, when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is larger than the preset threshold value or the total heating time in continuous timing is larger than a third preset time, clearing the heating time in accumulated timing and the total heating time in continuous timing.
Specifically, as shown in fig. 5, assuming that a difference Tmax1-Tmin1> T between the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1 at time T7 or the continuously counted total heating time tz is greater than a third preset time tc, the heating time ton during integration and the continuously counted total heating time tz are both cleared, and at the same time, the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1 are cleared, and the next cycle is started.
Compared with the method for judging whether the AD input device of the electric heater fails or not according to the difference value between the maximum temperature detection value and the minimum temperature detection value output by the AD input device in the heating stage of the electric heater in the prior art, the fault identification method of the AD input device of the electric heater can avoid the problem of misjudgment caused by small variation of the temperature detection value output by the AD input device after the heating amount of the electric heater is small or the heating amount reaches the boiling point, thereby improving the accuracy of fault identification of the AD input device of the electric heater, and effectively preventing the safety problem caused by continuous heating, such as overheating and fire, caused by the fact that the AD input device of the electric heater fails.
Further, referring to fig. 4, based on the third embodiment of the method for identifying a fault of the AD input device of the electric heater of the present invention, in the fourth embodiment of the method for identifying a fault of the AD input device of the electric heater of the present invention, after the step S10, the method further includes:
and S80, when the continuously counted unheated time is greater than or equal to a second preset time, clearing the heating time counted accumulatively and the total heating time counted continuously.
Specifically, in this embodiment, when the continuously counted unheated time toff is greater than or equal to a second preset time tb, that is, toff is greater than or equal to tb, the cumulatively counted heating time ton and the continuously counted total heating time tz are cleared, and the next cycle is started.
Compared with the method for judging whether the AD input device of the electric heater fails or not according to the difference value between the maximum temperature detection value and the minimum temperature detection value output by the AD input device in the heating stage of the electric heater in the prior art, the fault identification method of the AD input device of the electric heater can avoid the problem of misjudgment caused by small variation of the temperature detection value output by the AD input device after the heating amount of the electric heater is small or the heating amount reaches the boiling point, thereby improving the accuracy of fault identification of the AD input device of the electric heater, and effectively preventing the safety problem caused by continuous heating, such as overheating and fire, caused by the fact that the AD input device of the electric heater fails.
The present invention also provides an electric heater, and referring to fig. 6, in one embodiment, the electric heater 100 includes an AD input device 101 and a controller 102.
Specifically, the AD input device 101 is configured to detect an operating parameter of the electric heater 100 and input a temperature detection value to the controller 102. In this embodiment, the AD input device 101 includes a detecting module 1011 and an AD converting module 1012, wherein the detecting module 1011 is configured to detect an operating parameter (such as temperature) of the electric heater 100 to generate a detecting signal, the AD converting module 1012 is disposed in the controller 102 of the electric heater 100, and the AD converting module 1012 is configured to convert the detecting signal generated by the detecting module 1011 into a digital signal recognizable by the controller 102 of the electric heater 100.
In this embodiment, the controller 102 includes a first timer 1021, a second timer 1022, a third timer 1023, a fourth timer 1024, a data processing module 1025, a control module 1026, and a determination module 1027.
Specifically, the first timer 1021 is configured to count up the heating time ton of the electric heater 100;
the second timer 1022, configured to continuously time the unheated time toff of the electric heater 100;
the third timer 1023 is used for continuously timing the total heating time tz of the electric heater 100;
the fourth timer 1024 is used for continuously counting the heating stop time tg of the electric heater 100;
the data processing module 1025 is configured to compare the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1 output by the AD input device 101 during the heating time and the non-heating time of the electric heater 100 when the time ton counted by the first timer 1021 is greater than or equal to the first preset time ta and the time toff counted by the second timer 1022 is less than the second preset time tb; and comparing a second maximum temperature detection value Tmax2 and a second minimum temperature detection value Tmin2 output from the AD input device 101 during a heating stop time of the electric heater 100 when a counted time tg of the fourth timer 1024 is greater than or equal to a fourth preset time td;
the control module 1026 is configured to control the electric heater 100 to stop heating when a difference between the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1 is smaller than or equal to a preset threshold T, and the timing time tz of the third timer 1023 is smaller than or equal to a third preset time tc;
the judging module 1027 is used for judging that the AD input device 101 has a fault when the difference between the second maximum temperature detection value Tmax2 and the second minimum temperature detection value Tmin2 output by the AD input device 101 in the heating stop time of the electric heater 100 is less than or equal to the preset threshold value T (i.e. Tmax2-Tmin2 ≦ T).
In this embodiment, the electric heater 100 further includes an alarm device (not shown) for sending an alarm signal when the determining module 1027 determines that the AD input device 101 is faulty.
Specifically, in this embodiment, when the electric heater 100 is in the heating state, the first timer 1021 counts the heating time ton of the electric heater 100 in an accumulated manner, and the third timer 1023 counts the total heating time tz of the electric heater 100 in a continuous manner; when the electric heater 100 is heating, the control module 1026 clears the timing time toff of the second timer 1022; when the electric heater 100 is not heating, the second timer 1022 continuously counts the unheated time toff of the electric heater 100. Specifically, as shown in fig. 5, at time 0, the electric heater 100 enters a heating state, and the electric heater 100 is heated in a time period from 0 to t1, then at time 0, the first timer 1021 starts to count up the heating time ton of the electric heater 100 (the heating time ton1 in this time period is t1), the third timer 1023 counts up the total heating time tz of the electric heater 100 continuously, and at the same time, the control module 1026 clears the counted time toff of the second timer 1022, that is, clears the unheated time toff continuously counted by the second timer 1022; in the time period from t1 to t2, the electric heater 100 is not heated, so at time t1, the second timer 1022 starts to count continuously the unheated time toff of the electric heater 100, and the continuously counted unheated time toff of the second timer 1022 is t2-t 1; in the time period from t2 to t3, the electric heater 100 is heated again, the first timer 1021 needs to count the heating time ton of the time period, and the heating time ton2 of the time period is t3-t2, so that at the time point t3, the heating time ton counted by the first timer 1021 for counting the electric heater 100 is ton1+ ton2 is t1+ (t3-t 2). It is understood that, at the time t3, the total heating time continuously counted by the third timer 1023 is t 3. In this embodiment, if the heating time ton cumulatively counted by the first timer 1021 is less than the first preset time ta, the first timer 1021 continues to cumulatively count the heating time ton of the electric heater 100 when the electric heater 100 is heated next time, as shown in fig. 5, the heating time ton3 of the electric heater 100 is t5-t4 in the time period from t4 to t5, and similarly, the heating time ton4 of the electric heater 100 is t7-t6 in the time period from t6 to t7, so that the heating time ton cumulatively counted by the first timer 1021 is ton1+ ton 42 + ton3+ 4 is t1+ (t3-t2) + (t5-t4) + (t7-t6) at the time t7, and the heating time t7 continuously counted by the third timer is total time 7.
In this embodiment, when the heating time ton cumulatively counted by the first timer 1021 is greater than or equal to the first preset time ta and the unheated time toff continuously counted by the second timer 1022 is less than the second preset time tb, the data processing module 1025 compares the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1 output by the AD input device 101 during the heating time and the unheated time of the electric heater 100. As shown in fig. 5, the electric heater 100 is not heated in the time period from t1 to t2, and therefore, the second timer 1022 needs to continuously count the unheated time toff of the electric heater 100, and the unheated time toff continuously counted by the second timer 1022 is t2 to t 1. In this embodiment, if the unheated time toff continuously counted by the second timer 1022 is less than the second preset time tb, the control module 1026 needs to zero the counted time of the second timer 1022 every time the electric heater 100 is heated, as shown in fig. 5, the control module 1026 needs to zero the counted time of the second timer 1022 at times t2, t4, and t6, that is, when the electric heater 100 is unheated next time, the second timer 1022 needs to continuously count the unheated time toff of the electric heater 100 again. As shown in fig. 5, the second timer 1022 needs to count the unheated time toff of the electric heater 100 again in the time period t3-t 4 and in the time period t5-t 6.
It is understood that the time ranges of the first preset time ta and the second preset time tb may be set as required. In this embodiment, the first preset time ta is greater than or equal to 4 minutes and less than or equal to 6 minutes, and the second preset time tb is greater than or equal to 60 minutes and less than or equal to 65 minutes. Preferably, in this embodiment, the first preset time ta is 4 minutes, and the second preset time tb is 60 minutes.
In this embodiment, when the heating time ton cumulatively counted by the first timer 1021 is greater than or equal to a first preset time ta and the unheated time toff continuously counted by the second timer 1022 is less than a second preset time tb, the data processing module 1025 compares the maximum temperature detection value and the minimum temperature detection value output by the AD input device 101 during the heating time and the unheated time of the electric heater 100, and in this embodiment, the maximum temperature detection value and the minimum temperature detection value output by the AD input device 101 at this time are referred to as a first maximum temperature detection value and a first minimum temperature detection value. As shown in fig. 5, assuming that the heating time ton cumulatively counted by the first timer 1021 is greater than or equal to a first preset time ta at time t7, and the unheated time toff continuously counted by the second timer 1022 is less than a second preset time tb, in this embodiment, at time t7, the data processing module 1025 compares a first maximum temperature detection value and a first minimum temperature detection value output by the AD input device 101 during time t7, where in this embodiment, the first maximum temperature detection value is Tmax1, and the first minimum temperature detection value is Tmin 1. It should be noted that the Tmax1 and Tmin1 correspond to digital signals output by the AD conversion module 1012 in the AD input device 101.
As shown in fig. 5, assuming that the difference between the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1 is less than or equal to a preset threshold value T (i.e., Tmax1-Tmin1 ≦ T), and the total heating time tz continuously counted by the third timer 1023 is less than or equal to a third preset time tc (i.e., tz ≦ tc), at time T7, the control module 1026 controls the electric heater 100 to stop heating, and at the same time, the fourth timer 1024 continuously counts the stop heating time tg of the electric heater 100. In the embodiment, when the heating stop time tg is greater than or equal to the fourth preset time td (i.e. tg is greater than or equal to td), the data processing module 1025 compares the maximum temperature detection value and the minimum temperature detection value output by the AD input device 101 during the heating stop period of the electric heater 100. In the present embodiment, when the heating stop time tg is equal to or longer than td, the maximum temperature detection value and the minimum temperature detection value output by the AD input device 101 are referred to as a second maximum temperature detection value and a second minimum temperature detection value. As shown in fig. 5, when the heating stop time tg is equal to or longer than td at time t8, the second maximum temperature detection value is Tmax2, and the second minimum temperature detection value is Tmin 2. Then, the determining module 1027 determines whether the AD input device 101 has a fault according to the difference between the second maximum temperature detection value Tmax2 and the second minimum temperature detection value Tmin2, that is, in this embodiment, during the heating stop phase of the electric heater 101, the AD input device 101 of the electric heater 100 is determined to have a fault according to the difference between the maximum temperature detection value and the minimum temperature detection value output by the AD input device 101.
Specifically, as shown in fig. 5, if the difference between the second maximum temperature detection value Tmax2 and the second minimum temperature detection value Tmin2 is smaller than or equal to the preset threshold T (i.e., Tmax2-Tmin2 ≦ T), at time T8, the determining module 1027 determines that the AD input device of the electric heater is failed, and the alarm device sends an alarm signal.
It is understood that the range of the preset threshold T, the third preset time tc and the fourth preset time td may be set as required. In this embodiment, the range of the preset threshold T is greater than or equal to 1 AD value and less than or equal to 2 AD values, the time range of the third preset time tc is greater than or equal to 20 minutes and less than or equal to 25 minutes, and the time range of the fourth preset time td is greater than or equal to 25 minutes and less than or equal to 30 minutes. Preferably, in this embodiment, the preset threshold T is 1 AD value, the third preset time tc is 20 minutes, and the fourth preset time td is 25 minutes.
Further, in this embodiment, the determining module 1027 is further configured to:
when the difference between the second maximum temperature detection value Tmax2 and the second minimum temperature detection value Tmin2 is greater than the preset threshold T, i.e., Tmax2-Tmin2> T, the determining module 1027 determines that the AD input device 101 is normal, and the control module 1026 controls the electric heater 100 to recover the normal heating state.
Specifically, as shown in fig. 5, if the difference between the second maximum temperature detection value Tmax2 and the second minimum temperature detection value Tmin2 output by the AD input device 101 at time T8 is greater than the preset threshold T (i.e., Tmax2-Tmin2> T), the determining module 1027 determines that the AD input device 101 is normal, and the control module 1026 controls the electric heater 100 to return to the normal heating state.
Further, in this embodiment, the control module 1026 is further configured to:
and when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is greater than the preset threshold value or the timing time of the third timer is greater than a third preset time, clearing the first timer and the third timer.
Specifically, as shown in fig. 5, if a difference Tmax1-Tmin1> T between the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1 output from the AD input device 101 at time T7 or the total heating time tz continuously measured by the third timer 1023 is greater than a third preset time tc, the control module 1026 clears both the heating time ton cumulatively measured by the first timer 1021 and the total heating time tz continuously measured by the third timer 1023, and clears the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1, and controls the first timer 1021, the second timer 1022, and the third timer 1023 to enter the next cycle.
Further, in this embodiment, the control module 1026 is further configured to:
when the time counted by the second timer 1022 is greater than a second preset time tb, the first timer 1021 and the third timer 1023 are cleared. Specifically, when the unheated time toff continuously counted by the second timer 1022 is greater than or equal to a second preset time tb, that is, toff is greater than or equal to tb, the control module 1026 clears the heating time ton cumulatively counted by the first timer 1021 and the total heating time tz continuously counted by the third timer 1023, and controls the first timer 1021, the second timer 1022, and the third timer 1023 to enter the next cycle.
In the electric heater of this embodiment, first, the first timer 1021 in the controller 102 counts up the heating time ton of the electric heater 100, the third timer 1023 continuously counts up the total heating time tz of the electric heater 100, and the second timer 1022 continuously counts up the unheated time toff of the electric heater 100; then, when the heating time ton cumulatively counted by the first timer 1021 is greater than or equal to a first preset time ta (i.e., ton ≧ ta) and the unheated time toff continuously counted by the second timer 1022 is less than a second preset time tb (i.e., toff < tb), the data processing module 1025 compares the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1 output by the AD input device 101 during the heating time and the unheated time of the electric heater 100; when the difference between the first maximum temperature detection value Tmax1 and the first minimum temperature detection value Tmin1 is less than or equal to a preset threshold (i.e., Tmax1-Tmin 1. ltoreq.T) and the total heating time tz continuously counted by the third timer 1023 is less than or equal to a third preset time (i.e., tz. ltoreq. tc), the control module 1026 controls the electric heater to stop heating, and the fourth timer 1024 continuously counts the stop heating time tg of the electric heater 100; when the heating stop time tg is greater than or equal to a fourth preset time td (i.e. tg ≧ td), the data processing module 1025 compares a second maximum temperature detection value Tmax2 and a second minimum temperature detection value Tmin2 output by the AD input device 101 during the heating stop time of the electric heater 100; finally, the determining module 1027 determines that the AD input device is malfunctioning when a difference between the second maximum temperature detection value Tmax2 and the second minimum temperature detection value Tmin2 is less than or equal to the preset threshold T. Compared with the method for judging whether the AD input device of the electric heater fails or not according to the difference value between the maximum temperature detection value and the minimum temperature detection value output by the AD input device in the heating stage of the electric heater in the prior art, the method for judging whether the AD input device of the electric heater fails or not according to the difference value between the maximum temperature detection value and the minimum temperature detection value output by the AD input device in the heating stage of the electric heater avoids the problem of misjudgment caused by the small variation of the temperature detection value output by the AD input device after the heating amount of the electric heater is small or reaches the boiling point, thereby improving the accuracy of fault identification of the AD input device of the electric heater and effectively preventing the safety problem caused by continuous heating due to the fault of the AD input device of the electric heater, such as overheating, fire, etc.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A fault identification method of an AD input device of an electric heater is characterized by comprising the following steps:
s10, the heating time of the electric heater is counted up, and the total heating time of the electric heater and the unheated time of the electric heater are respectively counted continuously;
s20, when the heating time counted accumulatively is greater than or equal to a first preset time and the unheated time counted continuously is less than a second preset time, comparing a first maximum temperature detection value and a first minimum temperature detection value output by the AD input device of the electric heater in the heating time and the unheated time;
s30, controlling the electric heater to stop heating when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is less than or equal to a preset threshold value and the continuously timed total heating time is less than or equal to a third preset time;
s40, when the heating stop time is longer than or equal to the fourth preset time, comparing the second maximum temperature detection value and the second minimum temperature detection value output by the AD input device during the heating stop time of the electric heater;
and S50, judging the AD input device to be in fault when the difference value of the second maximum temperature detection value and the second minimum temperature detection value is less than or equal to the preset threshold value.
2. The method for recognizing a malfunction of an AD input device of an electric heater as set forth in claim 1, further comprising, after said step S40:
and S60, when the difference value between the second maximum temperature detection value and the second minimum temperature detection value is larger than the preset threshold value, judging that the AD input device is normal, and controlling the electric heater to recover the normal heating state.
3. The method for recognizing a malfunction of an AD input device of an electric heater as set forth in claim 2, further comprising, after said step S20:
and S70, when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is larger than the preset threshold value, or the continuously timed total heating time is larger than a third preset time, clearing the cumulatively timed total heating time and the continuously timed total heating time.
4. The method for identifying a malfunction of an AD input device of an electric heater according to any one of claims 1 to 3, further comprising, after the step S10:
and S80, when the continuously counted unheated time is greater than or equal to a second preset time, clearing the heating time counted accumulatively and the total heating time counted continuously.
5. The method for identifying a fault in an AD input device of an electric heater according to claim 1, wherein the step S10 is specifically:
when the electric heater is in a heating state, the heating time of the electric heater is counted up, and the total heating time of the electric heater is continuously counted; when the electric heater is used for heating, clearing the unheated time of the electric heater; continuously timing the unheated time of the electric heater when the electric heater is not heating.
6. An electric heater is characterized by comprising an AD input device and a controller, wherein the controller comprises a first timer, a second timer, a third timer, a fourth timer, a data processing module, a control module and a judgment module; wherein:
the AD input device is used for detecting working parameters of the electric heater and inputting a temperature detection value to the controller;
the first timer is used for performing accumulated timing on the heating time of the electric heater;
the second timer is used for continuously timing the unheated time of the electric heater;
the third timer is used for continuously timing the total heating time of the electric heater;
the fourth timer is used for continuously timing the heating stopping time of the electric heater;
the data processing module is used for comparing a first maximum temperature detection value and a first minimum temperature detection value output by the AD input device of the electric heater in the heating time and the non-heating time when the timing time of the first timer is greater than or equal to a first preset time and the timing time of the second timer is less than a second preset time; and comparing a second maximum temperature detection value and a second minimum temperature detection value output by the AD input device during the heating stopping time of the electric heater when the timing time of the fourth timer is greater than or equal to a fourth preset time;
the control module is used for controlling the electric heater to stop heating when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is smaller than or equal to a preset threshold value and the timing time of the third timer is smaller than or equal to a third preset time;
and the judging module is used for judging that the AD input device has a fault when the difference value of the second maximum temperature detection value and the second minimum temperature detection value is less than or equal to the preset threshold value.
7. The electric heater of claim 6, wherein the determining module is further configured to:
and when the difference value of the second maximum temperature detection value and the second minimum temperature detection value is larger than the preset threshold value, judging that the AD input device is normal, and controlling the electric heater to recover the normal heating state.
8. The electric heater of claim 7, wherein the control module is further configured to:
and when the difference value between the first maximum temperature detection value and the first minimum temperature detection value is greater than the preset threshold value or the timing time of the third timer is greater than a third preset time, clearing the first timer and the third timer.
9. The electric heater of any one of claims 6 to 8, wherein the control module is further configured to:
and when the timing time of the second timer is greater than a second preset time, clearing the first timer and the third timer.
10. The electric heater of claim 6, wherein the control module is further configured to:
when the electric heater is in a heating state, controlling the first timer to perform accumulated timing on the heating time of the electric heater, and controlling the third timer to perform continuous timing on the total heating time of the electric heater; when the electric heater is used for heating, the second timer is cleared; and when the electric heater does not heat, controlling the second timer to continuously time the unheated time of the electric heater.
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| EP2203726B1 (en) * | 2007-10-11 | 2011-06-29 | Ansaldo STS S.p.A. | Fail-safe temperature detection device |
| CN102735365B (en) * | 2012-06-25 | 2015-11-18 | 美的集团股份有限公司 | Ambient temperature detection device and fault judgment method thereof |
| CN104038221B (en) * | 2013-03-07 | 2017-04-19 | 美的集团股份有限公司 | Electric heater and method for carrying out fault identification on AD input device of electric heater |
| CN104066211B (en) * | 2013-03-19 | 2016-01-06 | 美的集团股份有限公司 | A kind of electric heater and dry combustion method knowledge method for distinguishing thereof with dry combustion method recognition function |
| CN106291311B (en) * | 2015-05-28 | 2019-09-27 | 佛山市顺德区美的电热电器制造有限公司 | The fault detection method and control method of electric cooking pot and its anti-spilled detection circuit |
| CN104949267A (en) * | 2015-06-08 | 2015-09-30 | 广东美的暖通设备有限公司 | Method and device for judging failure of frequency conversion module temperature detecting device |
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