CN113483918A - Method and system for testing temperature response rate of NTC (negative temperature coefficient) automobile temperature sensor - Google Patents
Method and system for testing temperature response rate of NTC (negative temperature coefficient) automobile temperature sensor Download PDFInfo
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- CN113483918A CN113483918A CN202110579519.XA CN202110579519A CN113483918A CN 113483918 A CN113483918 A CN 113483918A CN 202110579519 A CN202110579519 A CN 202110579519A CN 113483918 A CN113483918 A CN 113483918A
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention provides a method for testing the response rate of an NTC (negative temperature coefficient) automobile temperature sensor to temperature, which comprises the following steps: at constant wind temperature of T0The simulation air duct is provided with a temperature sensor; the temperature sensor is electrified to generate heat, and when the real-time resistance value is within the set resistance value range, the electrification is stopped, and the set resistance value range is that the induction temperature is in T1The corresponding sensor resistance value in the above time; when the real-time resistance value of the temperature sensor reaches a first set timing threshold value, timing is started, and the induction temperature corresponding to the first set timing threshold value is T2(ii) a When the real-time resistance value of the temperature sensor reaches a second set timing threshold value, the timing is stopped, and the induction temperature corresponding to the second set timing threshold value is T2‑[(T2‑T0)×63.2％](ii) a Taking the timing time as a thermal time constant of the temperature sensor; t is0<T2<T1. Correspondingly, a test system is also provided. The invention can better simulate the automobile air duct orifice, realize quick and accurate temperature field switching and time-counting start and stopThe machine is easy to handle and control. The accuracy and the reliability of the test result are ensured.
Description
Technical Field
The invention relates to detection of an automobile temperature sensor, in particular to a method and a system for testing the temperature response rate of an NTC automobile temperature sensor.
Background
The automobile air duct temperature sensor is a sensing device which senses air duct temperature signals, collects the signals and feeds the signals back to the control module so as to adjust the automobile heating system in due time, and the response speed of the automobile air duct temperature sensor to the temperature directly influences the operation of the automobile heating system. At present, the method for testing the response rate of the NTC automobile temperature sensor to the temperature is as follows: two constant temperature air boxes are prepared in advance, one is adjusted to T1 ℃, the other is adjusted to T2 ℃, then the sensor to be tested is transferred from the constant temperature air box at T1 ℃ to the constant temperature air box at T2 ℃, and a timer is adopted to record the time required by the temperature change of the sensor to be tested to be 63.2 percent (namely, (T2-T1) multiplied by 63.2 percent).
This test method can cause a large error in the detection result:
(1) the wind speed in the constant-temperature air box cannot be measured and is irregular, controllability is not available, and the wind speed cannot be well matched with the environment of the simulated automobile air duct;
(2) the temperature in the air box is easy to be unbalanced to cause severe fluctuation;
(3) the process of transferring the sensor to be detected is not easy to operate, and the sensor to be detected must pass through an uncontrollable variable of a room temperature environment during transferring to cause a large detection error;
(4) the timing of starting and ending the timer is not easy to grasp, and a great accidental error exists.
Disclosure of Invention
The invention relates to a method and a system for testing the temperature response rate of an NTC (negative temperature coefficient) automobile temperature sensor, which can at least solve part of defects in the prior art.
The invention relates to a method for testing the response rate of an NTC automobile temperature sensor to temperature, which comprises the following steps:
s1, installing the temperature sensor to be tested on a simulated air duct, wherein the simulated air duct is used for simulating the working condition of the automobile air duct, and the air temperature in the simulated air duct is constant T0；
S2, loading current to the temperature sensor to be measured to enable the temperature sensor to be measured to self-heat, and stopping loading current to the temperature sensor to be measured when the real-time resistance value of the temperature sensor to be measured is within the set resistance value range; the set resistance value range is that the induction temperature is T1The corresponding sensor resistance value in the above time;
s3, when the real-time resistance value of the temperature sensor to be measured reachesStarting timing when a first set timing threshold value is set, wherein the first set timing threshold value is that the induction temperature is T2The resistance value of the corresponding sensor;
s4, judging whether the real-time resistance value of the temperature sensor to be measured reaches a second set timing threshold value, if so, stopping timing, and if not, continuously monitoring the real-time resistance value of the temperature sensor to be measured and continuously timing; the induction temperature corresponding to the second set timing threshold is T2-[(T2-T0)×63.2％]；
S5, acquiring the timing time in S4, and taking the timing time as a thermal time constant of the temperature sensor to be measured;
wherein, T0<T2<T1。
In one embodiment, S2 includes:
s21, loading an initial current to the temperature sensor to be measured, monitoring the voltage and current values at two ends of the temperature sensor to be measured, and calculating to obtain the real-time resistance value of the temperature sensor to be measured according to a formula R which is U/I;
s22, after the resistance value of the temperature sensor to be measured is stable, calculating a required current change value delta I according to the R-t image slope and the target resistance value, and adjusting the loading current of the temperature sensor to be measured according to the delta I; the target resistance value is the induction temperature T1The resistance value of the corresponding sensor;
and S23, after the resistance value of the temperature sensor to be measured is stable, judging whether the current resistance value of the temperature sensor to be measured is within the set resistance value range, if so, stopping loading current to the temperature sensor to be measured, and if not, circularly carrying out S22-S23.
As one embodiment, in S1, the simulated air duct is placed in a constant temperature air box, and a blowing unit is disposed at one end of the simulated air duct and is used for circularly blowing a constant temperature gas medium in the constant temperature air box into the simulated air duct and matching the air speed in the simulated air duct with the air speed in the automobile air duct.
As one embodiment, an air gauge is disposed at the other end of the simulated air duct for monitoring the air speed in the simulated air duct in real time.
As one embodiment, in S3 and S4, a resistance scanner is used to obtain the real-time resistance of the temperature sensor to be measured.
The invention has at least the following beneficial effects:
(1) the simulated air duct is adopted to simulate the air duct working condition environment where the automobile temperature sensor is located in the actual use process of the automobile, the air speed is controllable and easy to control, the objective authenticity of the test condition can be effectively improved, the test result can reflect the running state of the automobile temperature sensor, and the test result has reference value.
(2) Because the temperature sensor is always positioned in the constant-temperature simulation air channel in the test process and does not need to be moved, the problems of easy fluctuation of temperature, inconvenient operation, easy influence of external environmental factors and the like in the traditional test method are solved, the test error is reduced, and the test operability and the test result accuracy are effectively improved.
(3) The invention simulates the temperature change process between two temperature points by utilizing the self-heating and subsequent natural cooling modes of the temperature sensor, realizes the fast and accurate temperature field switching, and avoids the problems of temperature fluctuation in the constant temperature air box and difficulty in moving and holding the timing start-stop time caused by the position transfer of the temperature sensor. Because the temperature sensor is self-heating, the influence of an external heating mode on a temperature field around the temperature sensor is avoided, the heating degree is easy to control, and the temperature control accuracy can be ensured, so that the accuracy and the reliability of a test result are ensured.
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 drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for testing a temperature response rate of an NTC automobile temperature sensor according to an embodiment of the present invention;
fig. 2 is a schematic installation diagram of a temperature sensor to be measured according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1 and 2, an embodiment of the present invention provides a method for testing a temperature response rate of an NTC automobile temperature sensor 13, including the following steps:
s1, installing the temperature sensor 13 to be measured on the simulation air duct 12, wherein the simulation air duct 12 is used for simulating the working condition of the automobile air duct, and the air temperature in the simulation air duct 12 is constant and is T0；
S2, loading current to the temperature sensor 13 to be measured to enable the temperature sensor 13 to be measured to self-heat, and stopping loading current to the temperature sensor 13 to be measured when the real-time resistance value of the temperature sensor 13 to be measured is within the set resistance value range; the set resistance value range is that the induction temperature is T1The corresponding sensor resistance value in the above time;
s3, when the real-time resistance value of the temperature sensor 13 to be measured reaches a first set timing threshold value, timing is started, wherein the first set timing threshold value is that the induction temperature is T2The resistance value of the corresponding sensor;
s4, determining whether the real-time resistance value of the temperature sensor 13 to be measured reaches a second set timing threshold, if yes, stopping timing, and if not, continuing to monitor the real-time resistance value of the temperature sensor 13 to be measured and continue timing; the induction temperature corresponding to the second set timing threshold is T2-[(T2-T0)×63.2％]；
S5, acquiring the timing time in S4, and taking the timing time as a thermal time constant of the temperature sensor 13 to be measured;
wherein, T0<T2<T1。
In the above step S1, the wind speed in the simulated wind channel 12 is preferably adjusted to a set wind speed, which matches the operating wind speed in the automobile wind channel, and in general, in the simulated wind channel 12, a constant wind speed is adopted in the test process; that is, the wind speed in the simulated wind tunnel 12 can be set and adjusted according to the operating wind speed conditions of the automobile wind tunnel. In one embodiment, as shown in fig. 2, a blower unit 14 is disposed at one end of the simulated air duct 12, and an air gauge 15 is disposed at the other end of the simulated air duct 12, wherein the air gauge 15 is used for detecting the air speed in the simulated air duct 12 in real time so as to guide the operation of the blower unit 14; the blower unit 14 may be a blower such as a fan.
For the arrangement of the temperature sensor 13 to be measured on the simulated air duct 12, it is obvious that the installation manner of the vehicle temperature sensor 13 on the vehicle air duct should be simulated, for example, the temperature sensor 13 to be measured is fixed on the air duct of the simulated air duct 12 and the detection end thereof extends into the tube cavity of the simulated air duct 12.
The wind temperature in the simulation wind channel 12 is constant and is T0Preferably, the simulated air duct 12 is disposed in the constant temperature air box 11, and the air blowing unit 14 can keep the constant temperature of the gas medium blown into the simulated air duct 12. The thermostatic air box 11 is typically a thermostatic air box.
In the step S2, the method specifically includes the following steps:
s21, loading an initial current to the temperature sensor 13 to be measured, monitoring a voltage and a current at two ends of the temperature sensor 13 to be measured, and calculating a real-time resistance value of the temperature sensor 13 to be measured according to a formula R ═ U/I;
s22, after the resistance value of the temperature sensor 13 to be measured is stable, calculating a required current change value delta I according to the R-t image slope and the target resistance value, and adjusting the loading current of the temperature sensor 13 to be measured according to the delta I; the target resistance value is the induction temperature T1The resistance value of the corresponding sensor;
and S23, after the resistance value of the temperature sensor 13 to be measured is stable, judging whether the current resistance value of the temperature sensor 13 to be measured is within the set resistance value range, if so, stopping loading the current to the temperature sensor 13 to be measured, and if not, circularly carrying out S22-S23.
In S22, the criterion for determining whether the resistance value of the temperature sensor 13 to be measured is stable is whether R ═ U/I is stable within 0.1% of fluctuation; the voltage and current values at two ends of the temperature sensor 13 to be tested can be monitored in real time by adopting a universal meter, in one embodiment, a high-precision six-bit half universal meter is adopted, for example, a Keysight34461A type universal meter is selected, and the testing precision can be improved. When the resistance value of the temperature sensor 13 to be measured is stable, the subsequent operation is carried out; if the resistance value of the temperature sensor 13 to be measured does not reach the stable state, the voltage and current values at the two ends of the temperature sensor 13 to be measured are continuously monitored, and the temperature sensor is waited to reach the stable state.
In addition, a high-quality power supply such as a Keysight3465A type power supply is preferably selected to ensure the stability of power supply and programmable accurate control.
In S22, for the NTC temperature sensor 13 (negative temperature coefficient sensor), the required current change value Δ I is generally a current increment value, and accordingly, as the current increases, the real-time resistance value of the temperature sensor 13 correspondingly decreases, and the temperature sensor 13 correspondingly self-heats and increases in temperature.
In S23, the determination method of whether the resistance of the temperature sensor 13 to be measured is stable is the same as the determination method in S22, which is not described herein again. It should be understood that in S23, when R ═ U/I decreases to or below the set threshold, that is, the current resistance value of the temperature sensor under test 13 is within the set resistance value range, it indicates that the temperature of the temperature sensor under test 13 increases to T1Or at T1The above.
It will be appreciated that, after stopping the application of current to the temperature sensor 13 to be measured, the temperature of this sensor will necessarily tend to decrease to the same temperature as that in the thermostatic air box 11, i.e. to T0(ii) a The temperature of the sensor will pass through T2～T0Interval, in this embodiment, the temperature change (T) is taken2-T0) The time taken for x 63.2% is often taken as the thermal time of the temperature sensor 13 to be measuredThe thermal time constant may characterize the rate at which the temperature sensor 13 responds to temperature. That is, the temperature of the temperature sensor 13 to be measured is lowered to T2The time begins to be counted, and the temperature of the temperature sensor 13 to be measured is reduced to T ═ T2-[(T2-T0)×63.2％]Stopping timing; therefore, the above-mentioned T is set in advance2～T0Interval, can be based on target temperature T of sensor2Correspondingly calculating the first set timing threshold value according to the target temperature T of the sensor2-[(T2-T0)×63.2％]And the second set timing threshold value is calculated correspondingly, so that the operation is easy.
Preferably, in S3 and S4, a resistance scanner is used to obtain the real-time resistance of the temperature sensor 13 to be measured. In one embodiment, a high-speed and high-precision six-bit half-resistance scanner is used, such as a Keysight model 34972A resistance scanner.
According to the test method provided by the embodiment, the simulated air duct 12 is adopted to simulate the air duct working condition environment where the automobile temperature sensor 13 is located in the actual use process of the automobile, the air speed is controllable and easy to control, the objective authenticity of the test condition can be effectively improved, the test result can reflect the running state of the automobile temperature sensor 13, and the test result has a reference value.
According to the testing method provided by the embodiment, the temperature sensor 13 is always positioned in the constant-temperature simulation air channel 12 in the testing process, and does not need to be moved, so that the problems that the temperature is easy to fluctuate, the operation is inconvenient, the influence of external environmental factors is easy to occur and the like in the traditional testing method are solved, the testing error is reduced, and the testing operability and the testing result accuracy are effectively improved.
According to the testing method provided by the embodiment, the temperature change process of the temperature sensor 13 between two temperature points is simulated by utilizing the self-heating and subsequent natural cooling modes of the temperature sensor 13, so that the rapid and accurate temperature field switching is realized, and the problems of temperature fluctuation in the constant temperature air box 11 and difficulty in timing start and stop timing control caused by the position transfer of the temperature sensor 13 are solved. Because the temperature sensor 13 is self-heating, the influence of an external heating mode on a temperature field around the temperature sensor 13 is avoided, the heating degree is easy to control, and the temperature control accuracy can be ensured, so that the accuracy and the reliability of a test result are ensured.
Example two
The embodiment of the invention correspondingly provides a system for testing the response rate of the NTC automobile temperature sensor 13 to the temperature, which comprises:
the constant temperature air box 11 is internally provided with a simulation air channel 12, one end of the simulation air channel 12 is provided with a blast unit 14, and the simulation air channel 12 is provided with a temperature sensor 13 mounting position;
the power supply is used for loading current to the temperature sensor 13 to be measured, the power supply is arranged in the constant temperature air box 11 or outside the constant temperature air box 11, and a power supply line of the power supply is wired to the installation position of the temperature sensor 13;
the resistance value scanner is used for acquiring the real-time resistance value of the temperature sensor 13 to be detected, is arranged in the constant-temperature air box 11 or outside the constant-temperature air box 11, and is used for wiring a connecting wire connected with the temperature sensor 13 to be detected to the installation position of the temperature sensor 13.
The details of the test system are already mentioned in the first embodiment, and are not described herein.
Preferably, as shown in fig. 2, an air gauge 15 is provided at the other end of the simulated air duct 12. The test system further comprises a control module, wherein the blower unit 14, the power supply, the control valve, the resistance value scanner, the air gauge 15 and the like are electrically connected with the control module, the related automatic control mode is a conventional automatic implementation scheme, additional programming is not needed, and details are not repeated here. In one embodiment, the control module may be a PC, and may further be configured with a display module, which may visually display real-time data and resistance value change images of the heating process and the cooling process of the temperature sensor 13, and is convenient for operation and control.
Further, the test system also comprises a multimeter for detecting the current voltage across the temperature sensor 13 to be tested when the current is loaded.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method for testing the response rate of an NTC automobile temperature sensor to temperature is characterized by comprising the following steps:
s1, installing the temperature sensor to be tested on a simulated air duct, wherein the simulated air duct is used for simulating the working condition of the automobile air duct, and the air temperature in the simulated air duct is constant T0；
S2, loading current to the temperature sensor to be measured to enable the temperature sensor to be measured to self-heat, and stopping loading current to the temperature sensor to be measured when the real-time resistance value of the temperature sensor to be measured is within the set resistance value range; the set resistance value range is that the induction temperature is T1The corresponding sensor resistance value in the above time;
s3, when the real-time resistance value of the temperature sensor to be measured reaches a first set timing threshold value, timing is started, wherein the first set timing threshold value is that the induction temperature is T2The resistance value of the corresponding sensor;
s4, judging whether the real-time resistance value of the temperature sensor to be measured reaches a second set timing threshold value, if so, stopping timing, and if not, continuously monitoring the real-time resistance value of the temperature sensor to be measured and continuously timing; the induction temperature corresponding to the second set timing threshold is T2-[(T2-T0)×63.2％]；
S5, acquiring the timing time in S4, and taking the timing time as a thermal time constant of the temperature sensor to be measured;
wherein, T0<T2<T1。
2. The method for testing the response rate of the NTC automobile temperature sensor to the temperature of claim 1, wherein in S2, the method comprises:
s21, loading an initial current to the temperature sensor to be measured, monitoring the voltage and current values at two ends of the temperature sensor to be measured, and calculating to obtain the real-time resistance value of the temperature sensor to be measured according to a formula R which is U/I;
s22, after the resistance value of the temperature sensor to be measured is stable, calculating a required current change value delta I according to the R-t image slope and the target resistance value, and adjusting the loading current of the temperature sensor to be measured according to the delta I; the target resistance value is the induction temperature T1The resistance value of the corresponding sensor;
and S23, after the resistance value of the temperature sensor to be measured is stable, judging whether the current resistance value of the temperature sensor to be measured is within the set resistance value range, if so, stopping loading current to the temperature sensor to be measured, and if not, circularly carrying out S22-S23.
3. The method for testing the response rate of the NTC automobile temperature sensor to temperature according to claim 1, wherein: and S1, placing the simulation air duct in a constant-temperature air box, wherein one end of the simulation air duct is provided with a blowing unit for circularly blowing the constant-temperature gas medium in the constant-temperature air box into the simulation air duct and enabling the air speed in the simulation air duct to be matched with the air speed in the automobile air duct.
4. The method for testing the response rate of the NTC automobile temperature sensor to temperature of claim 3, wherein: and the other end of the simulation air channel is provided with an air gauge for monitoring the air speed in the simulation air channel in real time.
5. The method for testing the response rate of the NTC automobile temperature sensor to temperature according to claim 1, wherein: and S3 and S4, acquiring the real-time resistance value of the temperature sensor to be measured by using a resistance value scanner.
6. A test system for response rate of an NTC automobile temperature sensor to temperature is characterized by comprising:
the constant-temperature air box is internally provided with a simulation air channel, one end of the simulation air channel is provided with a blast unit, and the simulation air channel is provided with a temperature sensor installation position;
the power supply is used for loading current to the temperature sensor to be measured, the power supply is arranged in the constant temperature air box or outside the constant temperature air box, and a power supply line of the power supply is wired to the installation position of the temperature sensor;
the resistance value scanner is used for acquiring the real-time resistance value of the temperature sensor to be detected, is arranged in the constant-temperature air box or outside the constant-temperature air box, and is used for wiring a connecting wire connected with the temperature sensor to be detected to the temperature sensor mounting position.
7. The NTC automotive temperature sensor temperature response rate to temperature test system of claim 6, wherein: and the other end of the simulation air channel is provided with an air gauge for monitoring the air speed in the simulation air channel in real time.
8. The NTC automotive temperature sensor temperature response rate to temperature test system of claim 6, wherein: the universal meter is used for detecting current and voltage at two ends of the temperature sensor to be detected when current is loaded.
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| CN110462355A (en) * | 2017-04-11 | 2019-11-15 | 昕诺飞控股有限公司 | Hot detection system and method |
| CN110763372A (en) * | 2019-11-29 | 2020-02-07 | 孝感华工高理电子有限公司 | Method for measuring resistance-temperature relation of NTC temperature sensor |
| CN211452669U (en) * | 2019-11-29 | 2020-09-08 | 孝感华工高理电子有限公司 | Multi-temperature-point multi-channel resistance acquisition system based on standard sample |
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2021
- 2021-05-26 CN CN202110579519.XA patent/CN113483918B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006071334A (en) * | 2004-08-31 | 2006-03-16 | Honda Motor Co Ltd | Temperature detection apparatus for vehicle |
| CN108414118A (en) * | 2017-02-10 | 2018-08-17 | 山西润玖汽车配件科技有限公司 | A kind of automobile-used high temperature sensor geo-thermal response test method |
| CN110462355A (en) * | 2017-04-11 | 2019-11-15 | 昕诺飞控股有限公司 | Hot detection system and method |
| CN110763372A (en) * | 2019-11-29 | 2020-02-07 | 孝感华工高理电子有限公司 | Method for measuring resistance-temperature relation of NTC temperature sensor |
| CN211452669U (en) * | 2019-11-29 | 2020-09-08 | 孝感华工高理电子有限公司 | Multi-temperature-point multi-channel resistance acquisition system based on standard sample |
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