CN218674843U - Device and system for simulating functions of wide-area oxygen sensor - Google Patents
Device and system for simulating functions of wide-area oxygen sensor Download PDFInfo
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- CN218674843U CN218674843U CN202222731029.XU CN202222731029U CN218674843U CN 218674843 U CN218674843 U CN 218674843U CN 202222731029 U CN202222731029 U CN 202222731029U CN 218674843 U CN218674843 U CN 218674843U
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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Abstract
The application discloses device and system of wide region oxygen sensor function of simulation, the device includes: the power amplifier comprises a Nernst voltage sampling circuit, a voltage source circuit, an adjustable resistor and a pump current end; the input end of the nernst voltage sampling circuit is connected with the first end of the adjustable resistor, the second end of the adjustable resistor is grounded, and different resistance values of the adjustable resistor correspond to different oxygen concentration environments; the first end of the adjustable resistor is also connected with a pump current end; the pump current end is used for receiving test current; the first end of the adjustable resistor is also connected with the output end of the voltage source circuit; and the nernst voltage sampling circuit is used for sampling a voltage signal on the adjustable resistor and feeding the voltage signal back to the electronic control unit ECU. By adopting the device for simulating the function of the wide-range oxygen sensor, the real oxygen concentration environment and the real wide-range oxygen sensor are not required to be accessed when the function of the ECU is tested, the safety of the test environment is improved, the condition that the wide-range oxygen sensor is damaged in the test process is avoided, and the cost is saved.
Description
Technical Field
The application relates to the technical field of equipment testing, in particular to a device and a system for simulating functions of a wide-area oxygen sensor.
Background
With the continuous development of automobile technology, the requirements of people on automobile exhaust emission are continuously improved. In order to achieve accurate control of air-fuel ratio, wide-area oxygen sensors are used in many automotive electronics. The wide-area oxygen sensor generates a Nernst voltage by detecting the difference in oxygen concentration between the cell and the reference cell. Normally, the nernst voltage is maintained at 0.45V, and when the nernst voltage is not 0.45V, the electronic control unit ECU controls the value of the pump current to pump in or out oxygen from the detection chamber so as to balance the oxygen concentration in the detection chamber. Therefore, the function of the ECU needs to be tested to ensure that the ECU accurately controls the pump current value according to the nernst voltage value.
At present, when the functions of the ECU are tested, a real wide-area oxygen sensor is often used for testing, the optimal working temperature of the real wide-area oxygen sensor in normal work is as high as more than 700 ℃, and the testing environment is dangerous; in addition, the products in the testing stage are often not mature enough, and the real wide-range oxygen sensor is easily damaged when the ECU is tested.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a device and a system for simulating the function of a wide-range oxygen sensor, so that a real sensor is not needed to be used when testing the function of an ECU, and the device and the system are safer.
In order to solve the above problems, the technical solution provided by the present application is as follows:
the application provides a device of wide region oxygen sensor function of simulation, includes: the power amplifier comprises a Nernst voltage sampling circuit, a voltage source circuit, an adjustable resistor and a pump current end;
the input end of the nernst voltage sampling circuit is connected with the first end of the adjustable resistor, the second end of the adjustable resistor is grounded, and different resistance values of the adjustable resistor correspond to different oxygen concentration environments;
the first end of the adjustable resistor is also connected with a pump current end; the pump current end is used for receiving test current; the first end of the adjustable resistor is also connected with the output end of the voltage source circuit;
and the nernst voltage sampling circuit is used for sampling a voltage signal on the adjustable resistor and feeding the voltage signal back to the electronic control unit ECU.
Preferably, the nernst voltage sampling circuit specifically comprises: the sensor comprises a first operational amplifier, a second operational amplifier, a first resistor, a second resistor and a sensor internal resistance;
the non-inverting input end of the first operational amplifier is used as the input end of the Nernst voltage sampling circuit; the inverting input end of the first operational amplifier is grounded through a first resistor; the second resistor is connected between the inverting input end of the first operational amplifier and the output end of the first operational amplifier;
the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the first end of the internal resistance of the sensor; and the second end of the internal resistance of the sensor is used as the output end of the Nernst voltage sampling circuit.
Preferably, the resistance value of the sensor is the internal resistance of the sensor at the optimal working temperature of the wide-range oxygen sensor.
Preferably, the voltage source circuit specifically includes: the third operational amplifier, the third resistor, the fourth resistor and the fifth resistor;
the non-inverting input end of the third operational amplifier is connected with the power supply voltage through a third resistor;
the non-inverting input end of the third operational amplifier is grounded through a fourth resistor;
the inverting input end of the third operational amplifier is connected with the output end of the third operational amplifier; the output end of the third operational amplifier is connected with the first end of the fifth resistor; and the second end of the fifth resistor is used as the output end of the voltage source circuit.
Preferably, the method further comprises the following steps: a sixth resistor;
the pump current end is connected with the first end of the adjustable resistor through a sixth resistor.
Or, the voltage source circuit specifically includes: the fourth operational amplifier, the direct current voltage source and the seventh resistor;
the non-inverting input end of the fourth operational amplifier is grounded through a direct-current voltage source; the inverting input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier; the output end of the fourth operational amplifier is connected with the output end of the voltage source circuit through a seventh resistor.
Preferably, the method further comprises the following steps: heating the anode, heating the cathode and the power resistor;
the power resistor is respectively connected with the heating anode and the heating cathode;
the heating anode and the heating cathode are used for being connected to the ECU.
Preferably, the method further comprises the following steps: calibrating a resistance end and a resistor;
the calibration resistor end is connected with the pump current end through a calibration resistor;
the calibration resistor end is used for being connected to the ECU.
The application also provides a system for simulating the function of the wide-area oxygen sensor, which comprises a device for simulating the function of the wide-area oxygen sensor and further comprises: an ECU;
and the ECU is used for outputting the test current to the pump current end and receiving a voltage signal sent by the Nernst voltage sampling circuit.
Preferably, the test current is 0.
Therefore, the application has the following beneficial effects:
the application provides a device of simulation wide region oxygen sensor function, adjustable resistor's different resistance is used for simulating different oxygen concentration environment, and ability stet voltage sampling circuit is used for feeding back ECU according to the voltage signal on the input current sampling adjustable resistor of pump current end to test ECU function. Therefore, the device can test the ECU without accessing a real oxygen concentration environment and a real wide-range oxygen sensor, improves the safety, avoids the condition of damaging the wide-range oxygen sensor in the test process, and saves the cost.
Drawings
FIG. 1 is a schematic diagram of a wide-area oxygen sensor;
FIG. 2 is a schematic diagram of a pump current closed loop control system for a wide area oxygen sensor;
FIG. 3 is a schematic diagram of an apparatus for simulating the function of a wide-area oxygen sensor according to an embodiment of the present disclosure;
FIG. 4 is a wide-area oxygen sensor output characteristic curve;
FIG. 5 is a circuit diagram of the interior of an apparatus for simulating the function of a wide-area oxygen sensor according to an embodiment of the present disclosure;
FIG. 6 is a circuit diagram of the interior of another device for simulating the function of a wide-area oxygen sensor according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of a system for simulating the function of a wide-area oxygen sensor according to an embodiment of the present disclosure.
Detailed Description
In order to more clearly understand the various embodiments of the present application, a brief description of the operating principle of the wide-area oxygen sensor is provided below.
Referring to fig. 1, a schematic diagram of a wide-area oxygen sensor is shown.
The wide-area oxygen sensor comprises the following parts: pump cell 1, diffusion orifice 2, nernst cell 3, reference chamber 4, heating element 5, detection chamber 6 and six pins. Six stitches are respectively: a calibration resistance RCal, a pump current Ip, a Nernst voltage Vs, a heated positive electrode H +, a heated negative electrode H-, and a common ground Vs/Ip.
The calibration resistor RCal is a factory-set resistor with a fixed resistance value and is used for making up for sensor differences caused by manufacturing errors; the heating anode H +, the heating cathode H-and the heating element 5 are used for heating the wide-range oxygen sensor to the optimal working temperature and maintaining the optimal working temperature; the detection chamber 6 is contacted with the tail gas in the exhaust pipe through the diffusion small holes 2, air with certain oxygen concentration is sealed in the reference chamber 4, and the difference of the oxygen concentration of the detection chamber 6 and the reference chamber 4 enables the Nernst cell 3 to generate Nernst voltage Vs; the pumping current Ip can move oxygen ions, and different directions of the pumping current Ip can enable oxygen to be pumped into or out of the detection chamber 6, so that the oxygen concentration in the detection chamber 6 is changed, the enabling voltage Vs is maintained at 0.45V, and the magnitude and the direction of the pumping current Ip correspond to different oxygen concentrations.
Referring to fig. 2, a schematic diagram of a pump current closed loop control system for a wide-area oxygen sensor is shown.
The core part of the wide-area oxygen sensor is used for adjusting the nernst voltage Vs through the pump current Ip, and the closed-loop adjustment process is as follows:
when the nernst voltage Vs is larger than 0.45V, the oxygen concentration content of the detection chamber 6 is low, the ECU controls Ip to be smaller than 0, and after the oxygen is injected into the pump cell, oxygen can be pumped into the detection chamber 6 to improve the oxygen concentration of the detection chamber 6, so that the nernst voltage Vs reaches 0.45V; when the nernst voltage Vs is less than 0.45V, the oxygen concentration content of the detection chamber 6 is high, the ECU controls Ip to be more than 0 at the moment, so that oxygen is pumped out of the detection chamber 6 to reduce the oxygen concentration of the detection chamber 6, and the nernst voltage Vs reaches 0.45V; when the Nernst voltage Vs is equal to 0.45V, the ECU calculates the oxygen concentration from the correspondence relationship between the pump current Ip and the oxygen concentration.
The above-described adjustment process of the pump current Ip may be regarded as a process in which the ECU controls the change of the pump current Ip based on the nernst voltage Vs. Therefore, in order to test the respective functions of the ECU, the present application simulates the sensor portion of the pump current closed-loop control, i.e., the input pump current Ip, outputting the nernst voltage Vs.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
Referring to fig. 3, the figure is a schematic diagram of an apparatus for simulating the function of a wide-area oxygen sensor according to an embodiment of the present disclosure.
The device 1000 for simulating the function of the wide-area oxygen sensor provided by the embodiment of the application comprises: the power amplifier comprises a power-step voltage sampling circuit 100, a pump current terminal 200, a voltage source circuit 300 and an adjustable resistor Rx.
The input end of the nernst voltage sampling circuit 100 is connected to the first end of the adjustable resistor Rx, and the second end of the adjustable resistor Rx is grounded; the first end of the adjustable resistor Rx is also connected with a pump current end 200; pump current terminal 200 is for receiving a test current; the first terminal of the adjustable resistor Rx is further connected to the output terminal of the voltage source circuit 300.
Different resistance values of the adjustable resistor Rx correspond to different oxygen concentration environments.
In order to make the apparatus provided by the embodiments of the present application better understood, the following description is given with reference to the accompanying drawings.
Referring to fig. 4, a wide-area oxygen sensor output characteristic curve is shown.
According to the circuit connection relationship, the electronic control unit ECU can obtain the relationship between the pump current Ip, the Nernst voltage Vs and the adjustable resistor resistance Rx. When the fixed nernst voltage Vs =0.45, the ECU may obtain a correspondence between the pump current Ip and the resistance of the adjustable resistor Rx; and then, by combining the corresponding relationship between the pump current Ip and the excess air factor lambda in the output characteristic curve of the wide-area oxygen sensor in fig. 4, the ECU can obtain the corresponding relationship between the resistance value of the adjustable resistor Rx and the excess air factor lambda. The excess air factor lambda indirectly reflects the oxygen concentration in the exhaust gas, so that different resistance values of the adjustable resistor Rx can correspond to different oxygen concentration environments.
The nernst voltage sampling circuit 100 is used for sampling a voltage signal on the adjustable resistor Rx and feeding the voltage signal back to the electronic control unit ECU.
In this case, the initial value of the test current is usually set to 0, and the device simulating the function of the wide-area oxygen sensor can obtain different nernst voltages Vs according to the resistance values of different adjustable resistors Rx. And feeding back the Nernst voltage Vs to the ECU for detection, wherein if the ECU can output a pump current Ip corresponding to the current oxygen concentration according to the input Nernst voltage Vs under the oxygen concentration environment simulated by the adjustable resistor Rx, the ECU functions normally.
The application provides a device of simulation wide region oxygen sensor function, adjustable resistor's different resistances are used for simulating different oxygen concentration environment, and ability stet voltage sampling circuit is used for feeding back to ECU according to the voltage signal on the input current sampling adjustable resistor of pump current end to test the ECU function. Therefore, the device can test the ECU without accessing a real oxygen concentration environment and a real wide-range oxygen sensor, improves the safety, avoids the condition of damaging the wide-range oxygen sensor in the test process, and saves the cost.
The embodiments of the present application do not specifically limit the specific implementation manners of the nernst sampling circuit and the voltage source circuit, for example, there are various circuit compositions, and the following examples are specifically presented.
Referring to fig. 5, a circuit diagram of the inside of a device simulating the function of a wide-area oxygen sensor is provided according to an embodiment of the present application.
The nernst voltage sampling circuit 100 specifically includes: the sensor comprises a first operational amplifier A1, a second operational amplifier A2, a first resistor R1, a second resistor R2 and a sensor internal resistance R.
The non-inverting input terminal of the first operational amplifier A1 serves as the input terminal of the nernst voltage sampling circuit 100; the inverting input end of the first operational amplifier A1 is grounded through a first resistor R1; the second resistor R2 is connected between the inverting input end of the first operational amplifier A1 and the output end of the first operational amplifier A1;
the output end of the first operational amplifier A1 is connected with the non-inverting input end of the second operational amplifier A2 through a node d, the inverting input end of the second operational amplifier A2 is connected with the output end of the second operational amplifier A2, and the output end of the second operational amplifier A2 is connected with the first end of the internal resistance r of the sensor; the second end of the internal resistance r of the sensor is used as the output end of the nernst voltage sampling circuit 100.
The internal resistance r of the sensor is usually the internal resistance of the sensor at the optimum operating temperature of the wide-range oxygen sensor.
The voltage source circuit 300 specifically includes: a third operational amplifier A3, a third resistor R3, a fourth resistor R4, and a fifth resistor R5.
The non-inverting input end of the third operational amplifier A3 is connected to a node a, and the node a is connected with a power supply voltage Vcc through a third resistor R3; the node a is also grounded through a fourth resistor R4; the inverting input end of the third operational amplifier A3 is connected with the output end of the third operational amplifier A3; the output end of the third operational amplifier A3 is connected to a node b, and the node b is connected with the first end of the fifth resistor R5; the second terminal of the fifth resistor R5 serves as the output terminal of the voltage source circuit 300.
The pump current end 200 is connected to a node c through a sixth resistor R6, and the node c is grounded through an adjustable resistor Rx; node c is also connected to the input of the nernst voltage sampling circuit 100; node c is also connected to the output of voltage source circuit 300.
Vs/Ip is the common ground for the overall circuit.
The circuit composition and the connection relation show that:
the voltage at node b is:
the equation for kirchhoff's current law at node c can be:
substituting formula (1) into formula (2) can result in:
in the nernst sampling circuit:
fixed Vs =0.45V available:
the corresponding relation between the pump current Ip and the adjustable resistance Rx can be obtained by the formula (5), and the corresponding relation between the adjustable resistance Rx and the oxygen concentration can be obtained according to the output characteristic curve of the wide-area oxygen sensor. Therefore, different resistances of the adjustable resistor Rx can be controlled to simulate different oxygen concentration environments.
When Rx indicates a certain oxygen concentration environment, the apparatus provided by the present application can calculate the nernst voltage Vs corresponding to the current oxygen concentration environment by using equations (3) and (4), and output the nernst voltage Vs to the ECU for testing.
The working voltage of the operational amplifier is not specifically limited in the embodiment of the present application, and may be 12V illustrated in the figure, or may be other values.
The device for simulating the function of the wide-area oxygen sensor further comprises:
heating the positive electrode H +, heating the negative electrode H-, heating the power resistor Rp, calibrating a resistor end RCal and calibrating a resistor RC.
The power resistor Rp is respectively connected with a heating anode H + and a heating cathode H-; the calibration resistor end RCal is connected to the pump current end 200 through the calibration resistor RC.
Wherein the heating anode H +, the heating cathode H-and the calibration resistance terminal RCal are used for connecting to the ECU.
In actual test, the ECU can normally work only by connecting six pins of the wide-area oxygen sensor, therefore, the device provided by the embodiment of the application simulates other pins of the real wide-area oxygen sensor by adding the heating anode H +, the heating cathode H-, the power resistor Rp, the calibration resistor end RCal and the calibration resistor RC, and the ECU does not need to use other modules as the pins for connection, so that the function test of the ECU is simpler.
Referring to fig. 6, a circuit diagram of the inside of another device simulating the function of a wide-area oxygen sensor is provided according to the embodiment of the present application.
The difference from the circuit diagram shown in fig. 5 is that the voltage source circuit 300 specifically includes: a fourth operational amplifier A3, a direct current voltage source DC and a seventh resistor R7;
the non-inverting input end of the fourth operational amplifier A3 is connected to a node a, and the node a is grounded through a direct-current voltage source DC; the inverting input end of the fourth operational amplifier A3 is connected with the output end of the fourth operational amplifier A3; the output terminal of the fourth operational amplifier A3 is connected to the node b, and the node b is connected to the output terminal of the voltage source circuit 300 through a seventh resistor R7.
The working voltage of the operational amplifier is not specifically limited in the embodiment of the present application, and may be 12V illustrated in the figure, or may be other values.
The direct-current voltage source is adopted in the voltage source circuit, so that the voltage value provided by the voltage source circuit can be better controlled, and the voltage value can be applied to program-controlled automatic testing, so that the testing is more convenient and faster.
Based on the device for simulating the function of the wide-area oxygen sensor provided by the above embodiments, the embodiments of the present application further provide a system for simulating the function of the wide-area oxygen sensor, which is described in detail below with reference to the accompanying drawings.
Referring to fig. 7, a schematic diagram of a system for simulating the function of a wide-area oxygen sensor according to an embodiment of the present disclosure is shown.
The system for simulating the function of the wide-area oxygen sensor comprises: a device 1000 for simulating the function of a wide-area oxygen sensor and an electronic control unit ECU.
The Vs end of the device 1000 for simulating the function of the wide-area oxygen sensor is connected with the input end of the ECU; the output of the ECU is connected to the Ip terminal of a device 1000 that simulates the functionality of a wide-area oxygen sensor.
Here, the initial value of the test current is usually set to 0, and the device 1000 simulating the function of the wide-range oxygen sensor can obtain the nernst voltage Vs in the environment corresponding to the oxygen concentration. And feeding back the Nernst voltage Vs to the ECU for detection, wherein if the ECU can output a pump current Ip corresponding to the current oxygen concentration according to the input Nernst voltage Vs under the oxygen concentration environment simulated by the adjustable resistor Rx, the ECU functions normally.
According to the system for simulating the function of the wide-area oxygen sensor, the device for simulating the function of the wide-area oxygen sensor obtains the Nernst voltage Vs according to the input test current and feeds the Nernst voltage Vs back to the ECU. When the ECU tests, the pump current Ip corresponding to the currently simulated oxygen concentration is output according to the input Nernst voltage Vs, and the ECU functions normally. Therefore, the system can test the ECU without accessing a real oxygen concentration environment and a real wide-range oxygen sensor, improves the safety, avoids the condition of damaging the wide-range oxygen sensor in the test process, and saves the cost.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An apparatus for simulating the function of a wide area oxygen sensor, comprising: the power amplifier comprises a Nernst voltage sampling circuit, a voltage source circuit, an adjustable resistor and a pump current end;
the input end of the Nernst voltage sampling circuit is connected with the first end of the adjustable resistor, the second end of the adjustable resistor is grounded, and different resistance values of the adjustable resistor correspond to different oxygen concentration environments;
the first end of the adjustable resistor is also connected with the pump current end; the pump current end is used for receiving test current; the first end of the adjustable resistor is also connected with the output end of the voltage source circuit;
the Nernst voltage sampling circuit is used for sampling a voltage signal on the adjustable resistor and feeding back the voltage signal to the electronic control unit ECU.
2. The apparatus of claim 1, wherein the Nernst voltage sampling circuit comprises in particular: the sensor comprises a first operational amplifier, a second operational amplifier, a first resistor, a second resistor and a sensor internal resistance;
the non-inverting input end of the first operational amplifier is used as the input end of the Nernst voltage sampling circuit; the inverting input end of the first operational amplifier is grounded through the first resistor; the second resistor is connected between the inverting input terminal of the first operational amplifier and the output terminal of the first operational amplifier;
the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the first end of the internal resistance of the sensor; and the second end of the internal resistance of the sensor is used as the output end of the Nernst voltage sampling circuit.
3. The apparatus of claim 2, wherein the sensor internal resistance value is an internal resistance of the sensor at an optimal operating temperature of the wide-area oxygen sensor.
4. The apparatus according to claim 1, wherein the voltage source circuit comprises in particular: the third operational amplifier, the third resistor, the fourth resistor and the fifth resistor;
the non-inverting input end of the third operational amplifier is connected with a power supply voltage through the third resistor;
the non-inverting input end of the third operational amplifier is grounded through the fourth resistor;
the inverting input end of the third operational amplifier is connected with the output end of the third operational amplifier; the output end of the third operational amplifier is connected with the first end of the fifth resistor; and the second end of the fifth resistor is used as the output end of the voltage source circuit.
5. The apparatus of claim 1, further comprising: a sixth resistor;
and the pump current end is connected with the first end of the adjustable resistor through the sixth resistor.
6. The apparatus according to claim 1, wherein the voltage source circuit comprises in particular: the fourth operational amplifier, the direct current voltage source and the seventh resistor;
the non-inverting input end of the fourth operational amplifier is grounded through the direct-current voltage source; the inverting input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier; the output end of the fourth operational amplifier is connected with the output end of the voltage source circuit through the seventh resistor.
7. The apparatus of claim 1, further comprising: heating the anode, heating the cathode and the power resistor;
the power resistor is respectively connected with the heating anode and the heating cathode;
the heating positive electrode and the heating negative electrode are used for being connected to an ECU.
8. The apparatus of claim 1, further comprising: calibrating a resistance end and a resistor;
the calibration resistor end is connected with the pump current end through the calibration resistor;
the calibration resistor end is used for being connected to the ECU.
9. A system for simulating the function of a wide-area oxygen sensor, comprising the apparatus for simulating the function of a wide-area oxygen sensor of any one of claims 1 to 8, further comprising: an ECU;
and the ECU is used for outputting the test current to the pump current end and receiving the voltage signal sent by the Nernst voltage sampling circuit.
10. The system of claim 9, wherein the test current is 0.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117589846A (en) * | 2024-01-04 | 2024-02-23 | 中国第一汽车股份有限公司 | Oxygen sensor activation time testing method, bench and circuit |
| CN117589841A (en) * | 2024-01-04 | 2024-02-23 | 中国第一汽车股份有限公司 | Wide-range oxygen sensor, testing circuit and testing method |
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2022
- 2022-10-17 CN CN202222731029.XU patent/CN218674843U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117589846A (en) * | 2024-01-04 | 2024-02-23 | 中国第一汽车股份有限公司 | Oxygen sensor activation time testing method, bench and circuit |
| CN117589841A (en) * | 2024-01-04 | 2024-02-23 | 中国第一汽车股份有限公司 | Wide-range oxygen sensor, testing circuit and testing method |
| CN117589846B (en) * | 2024-01-04 | 2024-05-14 | 中国第一汽车股份有限公司 | Oxygen sensor activation time testing method, bench and circuit |
| CN117589841B (en) * | 2024-01-04 | 2024-05-14 | 中国第一汽车股份有限公司 | Wide-range oxygen sensor, testing circuit and testing method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |