CN109855119B - Thermocouple and NTC temperature sensor fault detection method for gas stove - Google Patents
Thermocouple and NTC temperature sensor fault detection method for gas stove Download PDFInfo
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- CN109855119B CN109855119B CN201711232573.7A CN201711232573A CN109855119B CN 109855119 B CN109855119 B CN 109855119B CN 201711232573 A CN201711232573 A CN 201711232573A CN 109855119 B CN109855119 B CN 109855119B
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Abstract
The invention relates to a thermocouple and NTC temperature sensor fault detection method of a gas stove, which is characterized in that: in the normal use process of the gas stove, whether the thermocouple and the NTC temperature sensor have faults is judged by the following steps: step 1, collecting electromotive force Vn of a thermocouple and partial pressure Dn of an NTC temperature sensor once every 5-10 seconds; step 2, comparing the electromotive force Vn of the thermocouple with a preset thermocouple fault electromotive force value V, and outputting normal working signals of the thermocouple and the NTC temperature sensor if the Vn-V is more than or equal to 5mV and the Dn-D is more than or equal to 3 mV; otherwise, outputting a normal working signal of the thermocouple and an open circuit signal of the NTC temperature sensor; if Vn-V is less than 5mV and Dn-D is more than or equal to 3mV, outputting a thermocouple open-circuit signal and a normal working signal of the NTC temperature sensor; otherwise, outputting an open circuit signal of the NTC temperature sensor and an open circuit signal of the thermocouple. Compared with the prior art, the invention has the advantage that the mutual detection of the thermocouple and the NTC temperature sensor can be realized.
Description
Technical Field
The invention relates to a thermocouple and NTC temperature probe fault detection method of a gas stove.
Background
With the intellectualization of the gas stove, a thermocouple is used for detecting whether the gas stove has fire, and an NTC temperature sensor is used for detecting the temperature at the bottom of a pot or in the pot for intelligent control, so that the intelligent gas stove becomes a main trend of the intelligent gas stove. Due to the use of the thermocouple and the NTC temperature sensor, the possibility of the open circuit of the device exists and the normal use of the cooker is influenced, so how to detect the short circuit and open circuit faults of the thermocouple and the NCT temperature sensor becomes a problem which must be solved by the intelligent gas cooker.
Disclosure of Invention
The invention aims to solve the technical problem of providing a thermocouple and NTC temperature sensor fault detection method of a gas stove aiming at the prior art, which can realize mutual detection of whether the thermocouple and the NTC temperature sensor have faults or not.
The technical scheme adopted by the invention for solving the technical problems is as follows: a thermocouple and NTC temperature sensor fault detection method of the gas range, characterized by that: in the normal use process of the gas stove, whether the thermocouple and the NTC temperature sensor have faults is judged by the following steps:
step 1, collecting electromotive force Vn of a thermocouple and partial pressure Dn of an NTC temperature sensor once every 5-10 seconds;
step 2, comparing the electromotive force Vn of the thermocouple with a preset thermocouple fault electromotive force value V, if the Vn-V is more than or equal to 5mV, turning to step 3, otherwise, turning to step 4;
step 3, comparing the partial pressure Dn of the NTC temperature sensor with a preset fault partial pressure value D of the NTC temperature sensor, and outputting normal working signals of the thermocouple and the NTC temperature sensor if Dn-D is more than or equal to 3 mV; otherwise, outputting a normal working signal of the thermocouple and an open circuit signal of the NTC temperature sensor;
step 4, comparing the partial pressure Dn of the NTC temperature sensor with a preset fault partial pressure value D of the NTC temperature sensor, and outputting a thermocouple open-circuit signal and a normal working signal of the NTC temperature sensor if Dn-D is more than or equal to 3 mV; otherwise, outputting an open circuit signal of the NTC temperature sensor and an open circuit signal of the thermocouple.
As an improvement, within 8 seconds after the gas stove is successfully ignited, whether the thermocouple and the NTC temperature sensor are in failure is judged by the following steps:
step a, collecting electromotive force V1 of a thermocouple and partial pressure D1 of an NTC temperature sensor in the first second after a gas stove is ignited successfully;
step b, collecting electromotive force V2 of a thermocouple and partial pressure D2 of an NTC temperature sensor in the seventh second after the gas stove is successfully ignited;
step c, if the V2-V1 is more than or equal to 5mV and the V1 and the V2 are not equal to the preset thermocouple fault electromotive force value V, turning to step d, otherwise, turning to step e;
d, if D1-D2 is larger than or equal to 3Mv, and D1 and D2 are not equal to the preset NTC temperature sensor fault voltage division value D, outputting normal working signals of the thermocouple and the NTC temperature sensor, otherwise, outputting normal working signals of the thermocouple and an open circuit signal of the NTC temperature sensor;
and e, if the D1-D2 is larger than or equal to 3Mv, and the D1 and the D2 are not equal to the preset NTC temperature sensor fault voltage division value D, outputting a thermocouple open circuit signal and an NTC temperature sensor normal working signal, otherwise, outputting a thermocouple open circuit signal and an NTC temperature sensor open circuit signal.
Compared with the prior art, the invention has the advantages that: through the electromotive force of real-time collection thermocouple and NTC temperature sensor's partial pressure, whether NTC temperature sensor's partial pressure can change under the condition of having a fire judges NTC temperature sensor's good or bad, also can use NTC temperature sensor's partial pressure to change simultaneously, judges that the thermocouple whether takes place to open circuit to realize thermocouple and NTC temperature sensor's mutual detection.
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FIG. 1 is a flow chart of a method for detecting faults of a thermocouple and an NTC temperature probe of a gas stove in the normal use process of the gas stove in the embodiment of the invention.
FIG. 2 is a flowchart of a method for detecting faults of a thermocouple and an NTC temperature probe of a gas stove in the process from successful ignition to normal use of the gas stove in the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The invention provides a thermocouple and NTC temperature sensor fault detection method of a gas stove, which comprises two parts, wherein one part is the thermocouple and NTC temperature sensor fault detection within 8 seconds after the gas stove is successfully ignited, and the thermocouple and NTC temperature sensor fault detection in the normal use process after the gas stove is successfully ignited for 8 seconds.
Wherein, in the normal use process of the gas stove, whether the thermocouple and the NTC temperature sensor have faults is judged by the following steps, which are shown in figure 1:
step 1, collecting electromotive force Vn of a thermocouple and partial pressure Dn of an NTC temperature sensor once every 5-10 seconds;
step 2, comparing the electromotive force Vn of the thermocouple with a preset thermocouple fault electromotive force value V, if the Vn-V is more than or equal to 5mV, turning to step 3, otherwise, turning to step 4;
step 3, comparing the partial pressure Dn of the NTC temperature sensor with a preset fault partial pressure value D of the NTC temperature sensor, and outputting normal working signals of the thermocouple and the NTC temperature sensor if Dn-D is more than or equal to 3 mV; otherwise, outputting a normal working signal of the thermocouple and an open circuit signal of the NTC temperature sensor;
step 4, comparing the partial pressure Dn of the NTC temperature sensor with a preset fault partial pressure value D of the NTC temperature sensor, and outputting a thermocouple open-circuit signal and a normal working signal of the NTC temperature sensor if Dn-D is more than or equal to 3 mV; otherwise, outputting an open circuit signal of the NTC temperature sensor and an open circuit signal of the thermocouple.
Whether the thermocouple and the NTC temperature sensor have faults is judged within 8 seconds after the gas stove is ignited successfully through the following steps, and the method is shown in figure 2:
step a, collecting electromotive force V1 of a thermocouple and partial pressure D1 of an NTC temperature sensor in the first second after a gas stove is ignited successfully;
step b, collecting electromotive force V2 of a thermocouple and partial pressure D2 of an NTC temperature sensor in the seventh second after the gas stove is successfully ignited;
step c, if the V2-V1 is more than or equal to 5mV and the V1 and the V2 are not equal to the preset thermocouple fault electromotive force value V, turning to step d, otherwise, turning to step e;
d, if D1-D2 is larger than or equal to 3Mv, and D1 and D2 are not equal to the preset NTC temperature sensor fault voltage division value D, outputting normal working signals of the thermocouple and the NTC temperature sensor, otherwise, outputting normal working signals of the thermocouple and an open circuit signal of the NTC temperature sensor;
and e, if the D1-D2 is larger than or equal to 3Mv, and the D1 and the D2 are not equal to the preset NTC temperature sensor fault voltage division value D, outputting a thermocouple open circuit signal and an NTC temperature sensor normal working signal, otherwise, outputting a thermocouple open circuit signal and an NTC temperature sensor open circuit signal.
The method comprises the steps of collecting thermocouple electromotive force and partial pressure of an NTC temperature sensor in real time, heating the thermocouple by fire under the condition of fire, gradually increasing output electromotive force until saturation, and when the thermocouple is disconnected, keeping the partial pressure of the thermocouple at a constant value, wherein the constant value is a preset thermocouple fault electromotive force value V; under the condition of fire, the NTC temperature sensor has higher temperature and lower resistance, and has infinite resistance when in open circuit, and the voltage division of the NTC temperature sensor is D at the moment, namely the preset fault voltage division value D of the NTC temperature sensor; therefore, the invention judges whether the NTC temperature sensor is good or bad according to whether the output of the NTC temperature sensor changes under the condition of fire detection of the thermocouple, and simultaneously judges whether the thermocouple is broken or not according to the output change of the NTC temperature sensor, thereby realizing the mutual detection of the thermocouple and the NTC temperature sensor.
Claims (1)
1. A thermocouple and NTC temperature sensor fault detection method of the gas range, characterized by that: in the normal use process of the gas stove, whether the thermocouple and the NTC temperature sensor have faults is judged by the following steps:
step 1, collecting electromotive force Vn of a thermocouple and partial pressure Dn of an NTC temperature sensor once every 5-10 seconds;
step 2, comparing the electromotive force Vn of the thermocouple with a preset thermocouple fault electromotive force value V, if the Vn-V is more than or equal to 5mV, turning to step 3, otherwise, turning to step 4;
step 3, comparing the partial pressure Dn of the NTC temperature sensor with a preset fault partial pressure value D of the NTC temperature sensor, and outputting normal working signals of the thermocouple and the NTC temperature sensor if Dn-D is more than or equal to 3 mV; otherwise, outputting a normal working signal of the thermocouple and an open circuit signal of the NTC temperature sensor;
step 4, comparing the partial pressure Dn of the NTC temperature sensor with a preset fault partial pressure value D of the NTC temperature sensor, and outputting a thermocouple open-circuit signal and a normal working signal of the NTC temperature sensor if Dn-D is more than or equal to 3 mV; otherwise, outputting an NTC temperature sensor open circuit signal and a thermocouple open circuit signal;
within 8 seconds after the gas stove is ignited successfully, whether the thermocouple and the NTC temperature sensor have faults is judged through the following steps:
step a, collecting electromotive force V1 of a thermocouple and partial pressure D1 of an NTC temperature sensor in the first second after a gas stove is ignited successfully;
step b, collecting electromotive force V2 of a thermocouple and partial pressure D2 of an NTC temperature sensor in the seventh second after the gas stove is successfully ignited;
step c, if the V2-V1 is more than or equal to 5mV and the V1 and the V2 are not equal to the preset thermocouple fault electromotive force value V, turning to step d, otherwise, turning to step e;
d, if D1-D2 is more than or equal to 3mV, and D1 and D2 are not equal to a preset NTC temperature sensor fault voltage division value D, outputting normal working signals of the thermocouple and the NTC temperature sensor, otherwise, outputting a normal working signal of the thermocouple and an open circuit signal of the NTC temperature sensor;
and e, if the D1-D2 is more than or equal to 3mV and the D1 and the D2 are not equal to the preset NTC temperature sensor fault voltage division value D, outputting a thermocouple open circuit signal and an NTC temperature sensor normal working signal, otherwise, outputting both the thermocouple and the NTC temperature sensor open circuit signals.
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| CN201711232573.7A CN109855119B (en) | 2017-11-30 | 2017-11-30 | Thermocouple and NTC temperature sensor fault detection method for gas stove |
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| CN201711232573.7A CN109855119B (en) | 2017-11-30 | 2017-11-30 | Thermocouple and NTC temperature sensor fault detection method for gas stove |
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| CN109855119B true CN109855119B (en) | 2020-06-02 |
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