CN102262111A - Method and device for detecting oxygen sensor and oxygen sensor - Google Patents
Method and device for detecting oxygen sensor and oxygen sensor Download PDFInfo
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- CN102262111A CN102262111A CN2010101947053A CN201010194705A CN102262111A CN 102262111 A CN102262111 A CN 102262111A CN 2010101947053 A CN2010101947053 A CN 2010101947053A CN 201010194705 A CN201010194705 A CN 201010194705A CN 102262111 A CN102262111 A CN 102262111A
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- 239000001301 oxygen Substances 0.000 title claims abstract description 284
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 284
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 202
- 238000000034 method Methods 0.000 title claims abstract description 30
- -1 oxygen ions Chemical class 0.000 claims abstract description 82
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000003487 electrochemical reaction Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 38
- 230000009471 action Effects 0.000 claims description 18
- 230000007547 defect Effects 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 23
- 230000008569 process Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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Abstract
The invention provides a method and a device for detecting an oxygen sensor and the oxygen sensor. The method is used for detecting the oxygen sensor, and comprises the following steps of: 1, applying first voltage to the oxygen sensor within first preset time, and heating an ionized channel continuously; 2, applying second voltage to the oxygen sensor within second preset time, converting electrons obtained by outer electrode oxygen molecules at an outer electrode into outer electrode oxygen ions, and converting electrons obtained by inner electrode oxygen molecules at an inner electrode into inner electrode oxygen ions; and 3, checking a voltage signal between the outer electrode and the inner electrode within third preset time. By the technical scheme, after the oxygen sensor is activated, the oxygen molecules are subjected to electrochemical reaction on the inner electrode/outer electrode to be converted into the oxygen ions; and the oxygen ions move in the ionized channel to trigger the change of output voltage and judge whether the ionized channel has the performance defects such as blockage or cracks and the like or not according to the output voltage, so the electrical performance of the ionized channel can be detected.
Description
Technical Field
The invention relates to an automobile detection technology, in particular to a method for detecting an oxygen sensor, the oxygen sensor and a detection device.
Background
The automobile oxygen sensor is a key sensing component in an electronic fuel injection engine control system, and is a key part for controlling automobile exhaust emission, reducing the environmental pollution of an automobile and improving the fuel combustion quality of an automobile engine. A defective oxygen sensor will fail after a period of operation and will not provide a proper feedback signal to the Electronic Control Unit (ECU), resulting in the vehicle not being able to start.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: the conventional detection method for detecting the oxygen sensor measures the output voltage and the reaction time of the oxygen sensor, but if the oxygen ionization channel has defects such as blockage or cracks, the defects are difficult to find by using the detection method.
Disclosure of Invention
The invention provides a method for detecting an oxygen sensor, the oxygen sensor and a detection device, which are used for solving the problem that when the ionization channel of the oxygen sensor has the defects of blockage or cracks and the like, the detection result obtained by adopting the existing detection technology is inaccurate.
A method for detecting an ionization channel of an oxygen sensor, which is applied to the detection of the oxygen sensor, wherein the oxygen sensor at least comprises the following steps: the ionization device comprises an outer electrode, an ionization channel and an inner electrode, wherein the outer electrode and the inner electrode are positioned on two sides of the ionization channel; the method comprises the following steps: step one, within a first preset time, applying a first voltage to an oxygen sensor, and continuously heating an ionization channel; applying a second voltage to the oxygen sensor within a second preset time, obtaining electrons from the oxygen molecules at the outer electrode of the outer electrode, converting the electrons into oxygen ions at the outer electrode, and losing the electrons to form oxygen molecules at the inner electrode after the oxygen ions at the outer electrode reach the inner electrode through the ionization channel under the action of the second voltage; the oxygen molecules of the inner electrode at the inner electrode obtain electrons and convert the electrons into oxygen ions of the inner electrode, and the oxygen ions lose the electrons and become oxygen molecules of the outer electrode after reaching the outer electrode through an ionization channel under the action of oxygen pressure difference; step three, checking a voltage signal between the outer electrode and the inner electrode within third preset time; the voltage signal is formed by the oxygen ion concentration difference between the inner electrode and the outer electrode, and different numerical ranges of the voltage signal correspondingly identify the state of the oxygen sensor.
In the above method, the second voltage in the second step is formed by: pump voltage is connected to the outer electrode and the inner electrode, wherein the outer electrode is connected to a negative electrode of the pump voltage, and the inner electrode is connected to a positive electrode of the pump voltage; the pump voltage forms the second voltage between the outer electrode and the inner electrode.
In the above method, the oxygen pressure difference in the second step is formed by: adding an air reference cavity at the inner electrode, wherein the air reference cavity is positioned at the air side and stores air; the difference between the inner electrode oxygen ion concentration in the stored air and the outer electrode oxygen ion concentration at the outer electrode forms the oxygen pressure differential.
In the above method, the third step obtains, according to experimental data: when the value of the voltage signal is higher than 45mV, the phenomenon of blockage of an ionization channel is indicated; when the value of the voltage signal is lower than 20mV, the ionization channel is cracked; when the value of the voltage signal is between 20mV and 45mV, the ionization channel is normal.
An oxygen sensor detection device comprising: the precise power supply is used for applying a first voltage to the oxygen sensor within first preset time under the first function to continuously heat the ionization channel of the oxygen sensor; the oxygen sensor is also used for applying a second voltage to the oxygen sensor within a second preset time under a second function, so that the oxygen ions of the external electrode lose electrons to become oxygen molecules of the internal electrode after reaching the internal electrode through the ionization channel under the action of the second voltage; wherein, the outer electrode oxygen molecules at the outer electrode obtain electrons through electrochemical reaction and are converted into the outer electrode oxygen ions; the air reference cavity is used for providing inner electrode oxygen molecules at the inner electrode, and the inner electrode oxygen molecules at the inner electrode obtain electrons through electrochemical reaction and convert the electrons into inner electrode oxygen ions; and an oxygen pressure difference is formed between the oxygen ions of the inner electrode and the oxygen ions of the outer electrode, and under the action of the oxygen pressure difference, the oxygen ions of the inner electrode lose electrons to form oxygen molecules of the outer electrode after reaching the outer electrode through an ionization channel; the input/output module is used for switching a first function and a second function of the precision power supply; the data acquisition card is used for checking a voltage signal between the outer electrode and the inner electrode within third preset time; the voltage signal is formed by the oxygen ion concentration difference between the inner electrode and the outer electrode, and different numerical ranges of the voltage signal correspondingly identify the state of the oxygen sensor.
The above detection device further comprises: the indicator light comprises a red light and a green light; when the value of the voltage signal is higher than 45mV, the ionization channel is indicated to have a blockage phenomenon; or the value of the voltage signal is lower than 20mV, which indicates that a red light is on when the ionization channel has cracks; when the value of the voltage signal is between 20mV and 45mV, indicating that the ionization channel is normal, the green light is on.
The above detection device further comprises: the air cylinder is used for popping up the oxygen sensor when the red light is on; alternatively, when the green light is on, the oxygen sensor is popped up.
The above detection device further comprises: the virtual instrument is used for transmitting the detected output voltage value to the voltage signal at the end of each detection time interval and displaying the detected output voltage value; wherein the output voltage value is a voltage between the outer electrode and the inner electrode.
An oxygen sensor comprising: a heating end, an outer electrode, an ionization channel and an inner electrode; the heating end is used for applying a first voltage to the oxygen sensor within first preset time and continuously heating the ionization channel; the outer electrode is used for leading the oxygen molecules of the outer electrode at the outer electrode to obtain electrons and convert the electrons into oxygen ions of the outer electrode through electrochemical reaction in second preset time; the oxygen ions of the outer electrode lose electrons to become oxygen molecules of the inner electrode after reaching the inner electrode through the ionization channel under the action of a second voltage; the inner electrode is used for converting oxygen molecules at the inner electrode into oxygen ions at the inner electrode through an electrochemical reaction; the oxygen ions of the inner electrode reach the outer electrode through the ionization channel under the action of oxygen pressure difference and lose electrons to form oxygen molecules of the outer electrode; the ionization channel is used for transmitting external electrode oxygen ions and internal electrode oxygen ions; wherein, the difference of the oxygen ion concentration of the outer electrode and the oxygen ion concentration of the inner electrode can form a voltage signal between the outer electrode and the inner electrode; different value ranges of the voltage signal detected within the third predetermined time correspond to the status of the oxygen sensor.
The oxygen sensor described above further includes: the air reference cavity is positioned at the inner electrode and used for storing air; and the difference between the oxygen ion concentration of the inner electrode in the air and the oxygen ion concentration of the outer electrode at the outer electrode forms an oxygen pressure difference; when the oxygen pressure difference is higher than a preset value, the oxygen ions of the inner electrode reach the outer electrode through the ionization channel.
The technical scheme of the invention has the following beneficial effects: after the oxygen sensor is activated, oxygen molecules perform electrochemical reaction on the inner electrode/the outer electrode and are converted into oxygen ions; oxygen ions move in the ionization channel, so that the change of output voltage is triggered, and whether the ionization channel has performance defects such as blockage or cracks is judged according to the output voltage; therefore, the detection of the electrical property of the ionization channel is realized, the blank of the detection of the oxygen sensor is filled, the quality of the oxygen sensor is improved, and the hidden trouble is eliminated.
Drawings
FIG. 1 is a schematic diagram of an oxygen sensor according to the present invention;
FIG. 2 is a schematic flow chart of a method for detecting an ionization channel of an oxygen sensor according to the present invention;
FIG. 3 is a first schematic diagram illustrating an electrochemical reaction between oxygen molecules and oxygen ions in the oxygen sensor according to the present invention;
FIG. 4 is a second schematic diagram of the electrochemical reaction between oxygen molecules and oxygen ions in the oxygen sensor according to the present invention;
FIG. 5 is a schematic diagram of the operation of the oxygen sensor detecting device of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. The invention discloses a detection process and equipment for an ionization channel of an oxygen sensor.
As shown in fig. 1, the oxygen sensor includes: the device comprises a wire harness connector 1, a protective layer 2, an outer electrode 3, a (zirconium oxide) ionization channel 4, an inner electrode 5, an air reference cavity 6 and an insulating layer 7.
As shown in fig. 2, a method for detecting an ionization channel of an oxygen sensor is applied to detect the oxygen sensor, and the oxygen sensor at least comprises: the ionization device comprises an outer electrode, an ionization channel and an inner electrode, wherein the outer electrode and the inner electrode are positioned on two sides of the ionization channel; the method comprises the following steps:
102, applying a second voltage to the oxygen sensor within a second preset time, obtaining electrons from external electrode oxygen molecules at an external electrode, converting the electrons into external electrode oxygen ions, and losing the electrons to form internal electrode oxygen molecules after the external electrode oxygen ions reach the internal electrode through the ionization channel under the action of the second voltage;
the oxygen molecules of the inner electrode at the inner electrode obtain electrons and convert the electrons into oxygen ions of the inner electrode, and the oxygen ions lose the electrons and become oxygen molecules of the outer electrode after reaching the outer electrode through an ionization channel under the action of oxygen pressure difference;
By applying the provided technical scheme, after the oxygen sensor is activated, oxygen molecules carry out electrochemical reaction on the inner electrode/the outer electrode and are converted into oxygen ions; oxygen ions move in the ionization channel, so that the change of output voltage is triggered, and whether the ionization channel has performance defects such as blockage or cracks is judged according to the output voltage; therefore, the detection of the electrical property of the ionization channel is realized, the blank of the detection of the oxygen sensor is filled, the quality of the oxygen sensor is improved, and the hidden trouble is eliminated.
The harness connector 1 on the left side of the oxygen sensor is used for connecting a precision power supply 9. The outer electrode oxygen molecules, the outer electrode oxygen ions, the inner electrode oxygen molecules and the inner electrode oxygen ions are all called for distinguishing the oxygen molecules/oxygen ions at different positions of the oxygen sensor, and do not indicate that the molecules/ions have different properties.
Based on the provided technical solution, in the actual use process, considering the characteristics of the internal structure of the automobile, especially the characteristics of the working environment provided by the automobile for the oxygen sensor in the working process, the detection method of the oxygen sensor needs to be described in detail, and with reference to fig. 3 and 4, the method includes the following steps:
step 201, inserting an oxygen sensor joint into a test fixture; the test fixture is used for connecting the oxygen sensor terminal and the test electrode on the detection device.
Wherein, the oxygen sensor has four terminals, A, B, C, D terminals respectively: the AB terminal is defined as a signal end, the A terminal is an outer electrode, and the B terminal is an inner electrode; the CD terminal is defined as a heating end, is connected with the heater, heats the inner electrode, the outer electrode and the ionization channel after a first voltage is applied, and outputs a voltage signal after the heating temperature exceeds 450 ℃.
Step 203, adding 100mV pump voltage to the signal end of the oxygen sensor in second preset time; and oxygen is pumped into the air reference chamber 6, typically for a second predetermined time of 10 seconds.
In step 204, the outer electrode oxygen molecules at the outer electrode get electrons at the outer electrode and are converted into outer electrode oxygen ions, the oxygen ions pass through the ionization channel to reach the inner electrode under the action of the pump voltage, the electrons at the inner electrode are lost and the oxygen ions are converted into inner electrode oxygen molecules, so that the oxygen molecules outside the sensor can enter the oxygen sensor from the outer electrode and enter the air reference cavity 6 through the ionization channel in an ion mode.
The outer electrode oxygen molecules, the outer electrode oxygen ions, the inner electrode oxygen molecules and the inner electrode oxygen ions are all called for distinguishing different positions of the oxygen molecules/oxygen ions in the oxygen sensor, and do not indicate that the molecules/ions have different properties.
In step 205, the oxygen molecules of the inner electrode get electrons at the inner electrode and are converted into oxygen ions of the inner electrode, the oxygen ions of the inner electrode diffuse to the outer electrode through the ionization channel under the action of the oxygen pressure difference, the electrons are lost at the outer electrode and are converted into oxygen molecules of the outer electrode, and thus the oxygen molecules in the air reference cavity 6 diffuse to the outside of the oxygen sensor at the outer electrode.
The oxygen sensor is a solid dry battery, the oxygen pressure difference is generated between the inner electrode and the outer electrode according to the electrochemical principle due to the difference of oxygen ion concentration, the oxygen pressure difference generates electromotive force, and the size of the electromotive force accords with the Nerns special effect corresponding formula: e ═ RT/4F) Ln (P O2air/P O2 exh); wherein,
e is the electromotive force output voltage, R8.31 is the gas constant, T is the temperature, F96500 is the faraday constant, P O2air is the oxygen pressure in the reference chamber, P O2exh is the oxygen pressure outside the oxygen sensor.
After a second predetermined time, the pumping voltage is turned off and the pumping of oxygen into the air reference chamber 6 is stopped, step 206.
Step 207, in a third preset time, the virtual instrument acquires a voltage signal output by the output end of the test fixture through the data acquisition card, wherein the third preset time can be usually 30 seconds; and taking the third preset time as a detection time interval, wherein the acquired voltage signal is a voltage value at the moment of the end of the detection time interval.
In actual operation, the virtual instrument may adopt lavvie software, specifically applying to the function of voltmeter 8 in lavvie.
Step 208, the virtual instrument judges the test data; the following conclusions were drawn from the experimental data:
when the value of the voltage signal is higher than 45mV, the phenomenon of blockage of an ionization channel is indicated;
when the value of the voltage signal is lower than 20mV, the ionization channel is cracked;
when the value of the voltage signal is between 20mV and 45mV, the ionization channel is normal.
Step 209, the pneumatic device ejects the wire harness joint;
and recording the test data.
According to the characteristics of the working environment provided for the oxygen sensor in the working process of the automobile, the technical scheme is provided, the detection of the electrical property of the ionization channel is realized, the blank of the detection of the oxygen sensor is filled, the quality of the oxygen sensor is improved, and the hidden trouble is eliminated.
In the process of detecting an oxygen sensor, an oxygen sensor detecting device is applied, and as shown in fig. 5, the oxygen sensor detecting device includes:
the device comprises a precision power supply 9, a test fixture 10, a data acquisition card 11, an industrial personal computer 12, an input/output module 13, an air cylinder 14 and an indicator light 15. It should be noted that fig. 5 is drawn according to the signal interaction relationship between the units, that is, when there is signal interaction between two different units, the connection relationship is drawn in the figure.
And the precision power supply 9 is used for respectively outputting pump voltages of 13.5V and 100 mV. Wherein 13.5V is connected to the heating end of the oxygen sensor for heating, 100mV is connected with the inner electrode and the outer electrode, see figure 3, and oxygen is supplemented into the air reference cavity 6.
And the test fixture 10 is used for connecting the oxygen sensor terminal and a test electrode on the detection device. Wherein, the upper right end of the self-test fixture 10 is connected with A, B, C, D terminals of the oxygen sensor in a clockwise direction.
And the data acquisition card 11 is used for being in output connection with the upper right end and the lower right end of the test fixture 10, acquiring output voltage on the inner electrode and the outer electrode of the oxygen sensor, converting analog signals into digital signals and transmitting the digital signals to the industrial personal computer 12.
The industrial personal computer 12 is used for installing application software, and a user controls the test steps and analyzes test data through the application software, specifically, generates and sends control instructions according to the operation of the user or automatically. Moreover, the output voltages of the inner and outer electrodes can be obtained by the data acquisition card 11, or the corresponding digital signals can be obtained by the input/output module 13.
The input/output module 13 is used for realizing the transmission of the control instruction to the execution element; receive the control command from industrial computer 12 to carry out the break-make of this control command automatic switch hardware circuit, include: switching a first voltage of 13.5V of the precision power supply 9 to a heating end of the oxygen sensor for heating by switching a power transmission line, and switching a second voltage of 100mV of the precision power supply 9 to inner and outer electrodes of the oxygen sensor;
and transmits the digital signals acquired from the data acquisition card 11 to the industrial personal computer 12.
The air cylinder 14 receives a control command from the industrial personal computer 12 through the input/output module 13, and is used for pushing the clamping plate of the test fixture 10 to release the oxygen sensor if the oxygen sensor is judged to be qualified after the test is finished, so that the oxygen sensor can be taken out of the test fixture 10; if the oxygen sensor is unqualified, the cylinder does not act, at the moment, the air cylinder with the reset button needs to be pressed down to push the clamping plate of the test fixture 10, and the oxygen sensor is taken out.
The indicator light 15 has three kinds of lamps of red, yellow and green, and the red light is instructed that the oxygen sensor that is detected is unqualified, and the green light is instructed that the oxygen sensor is qualified, and the yellow light is instructed that detection device is testing. Since the technician prefers to use a virtual instrument instead of a physical instrument for the detection, the indicator light 15 may be an indicator light located on the virtual instrument, such as LABVIEW.
In order to describe the working principle of the oxygen sensor detection device, in a specific application scenario, and with reference to fig. 3 and 4, the detection process includes the following steps:
in step 301, the harness connector of the oxygen sensor is inserted into the test fixture 10.
Step 302, without loss of generality, adopting LABVIEW as the virtual instrument; the LABVIEW control input output module 13 switches the output of the precision power supply 9 to a 13.5V power supply, i.e. switches the 13.5V power supply into the heating circuit;
after heating for 30 seconds, the output of the precision power supply 9 is switched to 100mV, and after 10 seconds, the 100mV power supply provided by the precision power supply 9 is disconnected.
In step 303, the LABVIEW detects the output voltage of the output loop in real time as a voltage signal through the data acquisition card 11, the detection time interval is used as a detection period, and the output voltage value at the end of each detection time interval is transmitted to a variable corresponding to the voltage signal. Conventionally, the detection time interval may be set to 30 seconds.
A graph may be further plotted based on the voltage signals obtained as described above, wherein the horizontal axis is time and the vertical axis is the value of the voltage signal.
In step 304, the input/output module 13 disconnects the 13.5V power provided by the precision power supply 9.
Step 305, analyzing the value of the variable,
if the concentration is higher than 45mV or lower than 20mV, the red light is on; go to step 306.
If between 20mV and 45mV, the green light is on, step 307 is performed.
In step 306, the reset button is pressed, and the air cylinder 14 pushes the test fixture 10 to eject the oxygen sensor.
In step 307, the air cylinder 14 pushes the test fixture 10 to eject the oxygen sensor.
At step 308, the oxygen sensor is removed and the data obtained from the test is recorded.
In the provided technical scheme, a wire harness joint 1 of an oxygen sensor is inserted into a test fixture 10, two output ends of a precision power supply 9 respectively provide heating current and pump voltage for the oxygen sensor, oxygen molecules generate ionization reaction under the catalytic action of the pump voltage and zirconia of an inner electrode/an outer electrode, the oxygen molecules are converted into oxygen ions, the oxygen ions transmit oxygen in an air reference cavity 6 to the outside (exhaust side) of the oxygen sensor through an ionization channel 4 under the action of oxygen pressure difference, in the process, the oxygen ions diffuse between the inner electrode and the outer electrode, the action of the diffusion speed can form oxygen pressure difference (output voltage) in the ionization channel 4, and whether the electrical property of the ionization channel has defects is judged by detecting a voltage signal of the oxygen pressure difference; wherein, the automatic control and data analysis of the detection process are completed by virtual instrument-LABVIEW software.
The technical scheme of the invention has the following beneficial effects: after the oxygen sensor is activated, oxygen molecules perform electrochemical reaction on the inner electrode/the outer electrode and are converted into oxygen ions; oxygen ions move in the ionization channel, so that the change of output voltage is triggered, and whether the ionization channel has performance defects such as blockage or cracks is judged according to the output voltage; therefore, the detection of the electrical property of the ionization channel is realized, the blank of the detection of the oxygen sensor is filled, the quality of the oxygen sensor is improved, and the hidden trouble is eliminated.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for detecting an ionization channel of an oxygen sensor, the method being applied to detecting an oxygen sensor comprising at least: the ionization device comprises an outer electrode, an ionization channel and an inner electrode, wherein the outer electrode and the inner electrode are positioned on two sides of the ionization channel; the method comprises the following steps:
step one, within a first preset time, applying a first voltage to an oxygen sensor, and continuously heating an ionization channel;
applying a second voltage to the oxygen sensor within a second preset time, obtaining electrons from the oxygen molecules at the outer electrode of the outer electrode, converting the electrons into oxygen ions at the outer electrode, and losing the electrons to form oxygen molecules at the inner electrode after the oxygen ions at the outer electrode reach the inner electrode through the ionization channel under the action of the second voltage;
the oxygen molecules of the inner electrode at the inner electrode obtain electrons and convert the electrons into oxygen ions of the inner electrode, and the oxygen ions lose the electrons and become oxygen molecules of the outer electrode after reaching the outer electrode through an ionization channel under the action of oxygen pressure difference;
step three, checking a voltage signal between the outer electrode and the inner electrode within third preset time; the voltage signal is formed by the oxygen ion concentration difference between the inner electrode and the outer electrode, and different numerical ranges of the voltage signal correspondingly identify the state of the oxygen sensor.
2. The method of claim 1, wherein the second voltage in step two is formed by: pump voltage is connected to the outer electrode and the inner electrode, wherein the outer electrode is connected to a negative electrode of the pump voltage, and the inner electrode is connected to a positive electrode of the pump voltage; the pump voltage forms the second voltage between the outer electrode and the inner electrode.
3. The method of claim 1, wherein the oxygen pressure differential in step two is created by:
adding an air reference cavity at the inner electrode, wherein the air reference cavity is positioned at the air side and stores air;
the difference between the inner electrode oxygen ion concentration in the stored air and the outer electrode oxygen ion concentration at the outer electrode forms the oxygen pressure differential.
4. The method according to claim 1, wherein the third step is obtained according to experimental data:
when the value of the voltage signal is higher than 45mV, the phenomenon of blockage of an ionization channel is indicated;
when the value of the voltage signal is lower than 20mV, the ionization channel is cracked;
when the value of the voltage signal is between 20mV and 45mV, the ionization channel is normal.
5. An oxygen sensor detection device, comprising:
the precise power supply is used for applying a first voltage to the oxygen sensor within first preset time under the first function to continuously heat the ionization channel of the oxygen sensor;
the oxygen sensor is also used for applying a second voltage to the oxygen sensor within a second preset time under a second function, so that the oxygen ions of the external electrode lose electrons to become oxygen molecules of the internal electrode after reaching the internal electrode through the ionization channel under the action of the second voltage; wherein, the outer electrode oxygen molecules at the outer electrode obtain electrons through electrochemical reaction and are converted into the outer electrode oxygen ions;
the air reference cavity is used for providing inner electrode oxygen molecules at the inner electrode, and the inner electrode oxygen molecules at the inner electrode obtain electrons through electrochemical reaction and convert the electrons into inner electrode oxygen ions; and an oxygen pressure difference is formed between the oxygen ions of the inner electrode and the oxygen ions of the outer electrode, and under the action of the oxygen pressure difference, the oxygen ions of the inner electrode lose electrons to form oxygen molecules of the outer electrode after reaching the outer electrode through an ionization channel;
the input/output module is used for switching a first function and a second function of the precision power supply;
the data acquisition card is used for checking a voltage signal between the outer electrode and the inner electrode within third preset time; the voltage signal is formed by the oxygen ion concentration difference between the inner electrode and the outer electrode, and different numerical ranges of the voltage signal correspondingly identify the state of the oxygen sensor.
6. The oxygen sensor detecting device according to claim 5, further comprising:
the indicator light comprises a red light and a green light; when the value of the voltage signal is higher than 45m V, the ionization channel is indicated to be blocked; or the value of the voltage signal is lower than 20mV, which indicates that a red light is on when the ionization channel has cracks;
when the value of the voltage signal is between 20mV and 45mV, indicating that the ionization channel is normal, the green light is on.
7. The oxygen sensor detecting device according to claim 6, further comprising:
the air cylinder is used for popping up the oxygen sensor when the red light is on; alternatively, when the green light is on, the oxygen sensor is popped up.
8. The oxygen sensor detecting device according to claim 5, further comprising:
the virtual instrument is used for taking the detected output voltage value as a voltage signal and displaying the voltage signal at the moment of the end of the third preset time; wherein the output voltage value is a voltage between the outer electrode and the inner electrode.
9. An oxygen sensor, comprising: a heating end, an outer electrode, an ionization channel and an inner electrode;
the heating end is used for applying a first voltage to the oxygen sensor within first preset time and continuously heating the ionization channel;
the outer electrode is used for leading the oxygen molecules of the outer electrode at the outer electrode to obtain electrons and convert the electrons into oxygen ions of the outer electrode through electrochemical reaction in second preset time; the oxygen ions of the outer electrode lose electrons to become oxygen molecules of the inner electrode after reaching the inner electrode through the ionization channel under the action of a second voltage;
the inner electrode is used for converting oxygen molecules at the inner electrode into oxygen ions at the inner electrode through an electrochemical reaction; the oxygen ions of the inner electrode reach the outer electrode through the ionization channel under the action of oxygen pressure difference and lose electrons to form oxygen molecules of the outer electrode;
the ionization channel is used for transmitting external electrode oxygen ions and internal electrode oxygen ions; wherein, the difference of the oxygen ion concentration of the outer electrode and the oxygen ion concentration of the inner electrode can form a voltage signal between the outer electrode and the inner electrode; different value ranges of the voltage signal detected within the third predetermined time correspond to the status of the oxygen sensor.
10. The oxygen sensor of claim 9, further comprising:
the air reference cavity is positioned at the inner electrode and used for storing air;
and the difference between the oxygen ion concentration of the inner electrode in the air and the oxygen ion concentration of the outer electrode at the outer electrode forms an oxygen pressure difference; when the oxygen pressure difference is higher than a preset value, the oxygen ions of the inner electrode reach the outer electrode through the ionization channel.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN116165260A (en) * | 2022-11-18 | 2023-05-26 | 长城汽车股份有限公司 | Oxygen content detection device, exhaust gas oxygen content detection method and vehicle |
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| CN116165260A (en) * | 2022-11-18 | 2023-05-26 | 长城汽车股份有限公司 | Oxygen content detection device, exhaust gas oxygen content detection method and vehicle |
Also Published As
| Publication number | Publication date |
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| CN102262111B (en) | 2013-11-20 |
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