CN117192179A - Simulation system of wide-range oxygen sensor and simulation method of wide-range oxygen signal - Google Patents
Simulation system of wide-range oxygen sensor and simulation method of wide-range oxygen signal Download PDFInfo
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- CN117192179A CN117192179A CN202311276610.XA CN202311276610A CN117192179A CN 117192179 A CN117192179 A CN 117192179A CN 202311276610 A CN202311276610 A CN 202311276610A CN 117192179 A CN117192179 A CN 117192179A
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- 239000001301 oxygen Substances 0.000 title claims abstract description 96
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 96
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 238000004088 simulation Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 238000004891 communication Methods 0.000 claims abstract description 26
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims description 27
- 230000008859 change Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000446 fuel Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- -1 oxygen ions Chemical class 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The application belongs to the technical field of automobile engine control, and particularly relates to a wide-range oxygen sensor simulation system and a wide-range oxygen signal simulation method, wherein the wide-range oxygen sensor simulation system comprises a wide-range oxygen sensor, the wide-range oxygen sensor comprises a heater, a Nernst battery and a pump battery, and the simulation system further comprises an oxygen sensor simulator main body, an upper computer, a LoaderBox and a PICU controller; the oxygen sensor simulator main body is internally provided with a stabilized voltage power supply, an MCU, a control module and a communication module, wherein the stabilized voltage power supply is electrically connected with the MCU, and the control module and the communication module are both in bidirectional connection with the MCU; the upper computer is connected with the communication module in a bidirectional way through a cable. According to the application, the serial port communication interface is controlled by the set value of the upper computer, so that the analog signal output by the wide oxygen sensor under each working condition can be completely simulated, and compared with the limitation that the actual sensor is limited by the production line testing environment, the automatic test of the wide oxygen signal is realized, and the accuracy and stability of the test are improved.
Description
Technical Field
The application belongs to the technical field of automobile engine control, and particularly relates to a wide-range oxygen sensor simulation system and a wide-range oxygen signal simulation method.
Background
The oxygen sensor is an instrument sensor in a gasoline engine combustion system and is used for controlling the air-fuel ratio in an automobile engine fuel feedback control system. The working principle of the oxygen sensor is as follows: at a certain temperature, oxygen molecules on the high concentration side are adsorbed on the platinum electrode and combined with electrons (4 e) to form oxygen ions O2-at a certain temperature, so that the electrode is positively charged, O2-ions migrate to the low oxygen concentration side (waste gas side) through oxygen ion vacancies in the electrolyte, and the electrode is negatively charged, namely, a potential difference is generated, and the larger the concentration difference is, the larger the potential difference is. The oxygen sensor is the best combustion atmosphere measuring mode at present, and has the advantages of simple structure, quick response, easy maintenance, convenient use, accurate measurement and the like.
However, with the increasing awareness of environmental protection and the increasing strictness of automobile emission regulations, the conventional switch-type oxygen sensor cannot meet the requirement of high emission standards, and because the switch-type oxygen sensor can only jump to display the two states of rich and lean of the mixture and cannot display the degree of rich and lean, the wide-area oxygen sensor with higher control precision gradually replaces the sensor.
In the production and test process of the gasoline engine controller, calibration test is required to be carried out on a wide oxygen interface chip in the controller, but a real oxygen sensor cannot realize signal output of the concentration and the dilution of the mixed gas in the production test stage, so that a worker cannot accurately acquire test information, and certain use limitations exist.
Accordingly, in order to solve the above-mentioned problems, it is necessary to provide a wide-area oxygen sensor simulation system and a wide-area oxygen signal simulation method.
Disclosure of Invention
The application aims to provide a simulation system and a simulation method of a wide-range oxygen sensor, which are used for solving the problem that the wide-range oxygen sensor is limited by a test environment.
In order to achieve the above object, an embodiment of the present application provides the following technical solution:
the simulation system of the wide-range oxygen sensor comprises the wide-range oxygen sensor, wherein the wide-range oxygen sensor comprises a heater, a Nernst battery and a pump battery, and the simulation system further comprises an oxygen sensor simulator main body, an upper computer, a LoaderBox and a PICU controller;
the oxygen sensor simulator comprises an oxygen sensor simulator body, a control module and a communication module, wherein the oxygen sensor simulator body is internally provided with a stabilized voltage supply, an MCU, the control module and the communication module, the stabilized voltage supply is electrically connected with the MCU, and the control module and the communication module are both connected with the MCU in a bidirectional manner;
the upper computer is connected with the communication module in a bidirectional way through a cable;
the LoaderBox is connected with the upper computer in a bidirectional way;
the PICU controller is respectively connected with the control module and the LoaderBox in a bidirectional mode.
Further, the control module comprises a pump voltage output module, a pump resistance output module, a pump current acquisition module and a heating signal acquisition module, wherein the pump voltage output module is used for simulating the voltage change of the Nernst battery and controlling the magnitude of the pump current, the pump resistance output module is used for simulating the internal resistance change of the Nernst battery and controlling the heating duty ratio signal, and the pump current acquisition module is used for acquiring the magnitude of the pump current.
Further, the communication module comprises an RS485 isolator, the RS485 isolator is connected to the UART end of the MCU, and a communication interface is connected to the RS485 isolator.
Further, the oxygen sensor simulator main body is also connected with a wide oxygen interface, and the wide oxygen interface is connected with the control module.
Further, the PICU controller comprises an interface chip and a PICU main control unit, the PICU controller is connected with the control module, and the interface chip is in bidirectional connection with the PICU main control unit.
Further, after the heating energy Steud battery enters a working state, the internal resistance is stabilized at 300 omega, the MCU controls the heating signal duty ratio by detecting the internal resistance, the heating signal acquisition module changes the output impedance of the pump resistance output module by detecting the heating signal duty ratio, and the heating signal duty ratio is controlled in a closed loop manner and is used for controlling the internal resistance of the energy Steud battery and the heating signal.
Further, after the pump current acquisition module acquires the pump current and converts the pump current into voltage, the converted voltage is added with the DAC end output voltage of the MCU by using the operational amplifier adding circuit and then is sent to the interface chip, the interface chip controls the pump current, the closed loop stable pump voltage is output at 450mV, and the MCU reads the pump current value and sends the pump current value to the upper computer.
Further, the oxygen sensor simulator main body is communicated with the upper computer through the communication module, the upper computer controls the MCU in the oxygen sensor simulator main body through the issuing instruction, the MCU modifies the DAC end control output value of the MCU after identifying the instruction, the interface chip outputs corresponding pump current and feeds data back to the upper computer through the bus, and the upper computer judges the working condition of the interface chip through comparing the set pump current and the feedback pump current to finish the test.
Further, the MCU can acquire the duty ratio of the heating signal in real time, control the output of the closed-loop control pump resistor, and feed back the controller to adjust the duty ratio; and (3) ending the test program, and automatically controlling the pump current output and the pump resistance output through the two-point control.
A simulation method of the simulation system of the wide-area oxygen sensor comprises the following steps:
s1, a tester presses a travel switch to trigger the start of a test;
s2, an upper computer at the PC end sends a data writing instruction;
s3, the oxygen sensor simulator main body receives the instruction and outputs corresponding analog voltage;
s4, the PICU controller reads the data of the interface chip and sends the data to the upper computer;
s5, executing test stages of working conditions S2-S4, and ensuring all sequential execution;
s6, the upper computer judges the test data and generates a test report;
s7, testing is completed.
Compared with the prior art, the application has the following advantages:
according to the application, the serial port communication interface is controlled by the set value of the upper computer, so that the analog signal output by the wide oxygen sensor under each working condition can be completely simulated, and compared with the limitation that the actual sensor is limited by the production line testing environment, the automatic test of the wide oxygen signal is realized, and the accuracy and stability of the test are improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a block diagram of a simulation system for a wide-area oxygen sensor in accordance with one embodiment of the present application;
FIG. 2 is a hardware block diagram of an oxygen sensor simulator in accordance with one embodiment of the application;
FIG. 3 is a flow chart of a main cycle of an oxygen sensor simulator in an embodiment of the application;
FIG. 4 is a flow chart of a simulation system test of a wide-area oxygen sensor according to an embodiment of the application;
FIG. 5 is a perspective view of a wide-area oxygen sensor simulator in accordance with one embodiment of the present application;
FIG. 6 is a schematic diagram of a real wide-area oxygen sensor according to an embodiment of the application.
In the figure: 1. oxygen sensor simulator body, 101. Communication interface, 102. Wide oxygen interface.
Detailed Description
The present application will be described in detail below with reference to the embodiments shown in the drawings. The embodiments are not intended to limit the application, but structural, methodological, or functional modifications of the application from those skilled in the art are included within the scope of the application.
The application discloses a simulation system of a wide-area oxygen sensor, which is shown in fig. 1-6 and comprises a wide-area oxygen sensor, an oxygen sensor simulator main body 1, an upper computer, a LoaderBox and a PICU controller.
Referring to fig. 6, the wide-area oxygen sensor includes a heater, a nernst cell, and a pump cell.
Among them, since the oxygen sensor is mainly composed of zirconia, a characteristic thereof is that oxygen ions are conducted at a high temperature of at least 350 ℃. Therefore, after the oxygen sensor starts to work, the controller drives the MOS tube in a pulse width modulation mode and heats the MOS tube to a constant temperature through the heater, so that the working state of the oxygen sensor is maintained.
In addition, the working principle of the pump cell is that one side of the oxygen sensor is connected with the exhaust gas, and after current is applied to the two sides of the pump cell, oxygen atoms are pumped into the monitoring chamber from the exhaust gas through the diffusion holes. Since the amount of oxygen content is in one-to-one correspondence with the air-fuel ratio, the change in the air-fuel ratio can be fed back by detecting the magnitude of the pump current. When the pump current lp flows through the calibration resistor of the oxygen sensor, a voltage drop is generated on the calibration resistor, and the voltage at two ends of the calibration resistor is detected by the internal interface chip of the controller to reflect the magnitude and the direction of the pump current lp, so that the precise magnitude of the air-fuel ratio can be known through the magnitude and the direction of the current.
Specifically, the operation principle of the nernst cell is to generate an electromotive force of about 0.45V around the air-fuel ratio λ=1 by using an electrochemical reaction of zirconia which is a sensor. When the mixture is too rich, the amount of oxygen in the exhaust gas becomes small, and the pump cell still operates at the previous current, and the amount of oxygen in the measurement chamber becomes small. At this time, the electromotive voltage exceeds the reference voltage, the controller increases the pump current to increase the oxygen content in the monitoring chamber, the Nernst cell voltage is restored to 0.45V, and the ECU detects that the pump current is increased to reduce the fuel injection amount. The same applies when the mixture is too lean, the oxygen content in the exhaust gas increases, and the pump cell still works according to the previous current, so that the oxygen content in the measuring chamber increases. At this time, the electromotive voltage is lower than the reference voltage, the controller needs to decrease the pump current to decrease the oxygen amount in the monitoring chamber, the Nernst cell voltage is restored to 0.45V, and the ECU detects that the pump current becomes smaller to increase the fuel injection amount.
Referring to fig. 1 to 5, a stabilized voltage power supply, an MCU, a control module and a communication module are arranged in an oxygen sensor simulator main body 1, the stabilized voltage power supply is electrically connected with the MCU, and the control module and the communication module are both connected with the MCU in a bidirectional manner.
The control module comprises a pump voltage output module, a pump resistance output module, a pump current acquisition module and a heating signal acquisition module. The pump voltage output module is used for simulating the voltage change of the Nernst battery and controlling the magnitude of the pump current. The pump resistance output module is used for simulating the internal resistance change of the Nernst battery and controlling the heating duty ratio signal. The pump current acquisition module is used for acquiring the magnitude of the pump current.
In addition, the communication module comprises an RS485 isolator, the RS485 isolator is connected to the UART end of the MCU, and the RS485 isolator is connected with the communication interface 101.
Specifically, the oxygen sensor simulator main body 1 is also connected with a wide oxygen interface 102, and the wide oxygen interface 102 is connected with a control module.
Referring to fig. 1-5, the upper computer is connected with the communication module in a bidirectional manner through a cable, the LoaderBox is connected with the upper computer in a bidirectional manner, and the PICU controller is connected with the control module and the LoaderBox in a bidirectional manner respectively.
The PICU controller comprises an interface chip and a PICU main control unit, the PICU controller is connected with the control module, and the interface chip is in bidirectional connection with the PICU main control unit.
In addition, after the heating Nernst battery enters into a working state, the internal resistance is stabilized at 300 omega, and the MCU controls the duty ratio of the heating signal by detecting the magnitude of the internal resistance. The heating signal acquisition module changes the output impedance of the pump resistance output module by detecting the heating signal duty ratio, and the heating signal duty ratio is controlled in a closed loop manner and is used for controlling the internal resistance of the Nernst battery and the heating signal.
Specifically, after the pump current acquisition module acquires the pump current and converts the pump current into voltage, an operational amplifier adding circuit is used for adding the converted voltage and the DAC end output voltage of the MCU and then sending the added voltage to an interface chip. The interface chip controls the pump current, the closed loop stable pump voltage is output at 450mV, and the MCU reads the pump current value and sends the pump current value to the upper computer.
In addition, the oxygen sensor simulator main body 1 communicates with an upper computer through a communication module, and the upper computer controls the MCU in the oxygen sensor simulator main body 1 through issuing instructions. After the MCU identifies the instruction, the DAC end control output value of the MCU is modified, the interface chip outputs corresponding pump current and feeds data back to the upper computer through the bus. The upper computer judges the working condition of the interface chip by comparing the set pump current and the feedback pump current to finish the test.
Furthermore, the MCU can acquire the duty ratio of the heating signal in real time, control the output of the closed-loop control pump resistor, and feed back the controller to adjust the duty ratio. And (3) ending the test program, and automatically controlling the pump current output and the pump resistance output through the two-point control.
A method of simulating a wide-area oxygen sensor simulation system, comprising the steps of:
s1, a tester presses a travel switch to trigger the start of a test;
s2, an upper computer at the PC end sends a data writing instruction;
s3, the oxygen sensor simulator main body 1 receives the instruction and outputs corresponding analog voltage;
s4, the PICU controller reads the data of the interface chip and sends the data to the upper computer;
s5, executing test stages of working conditions S2-S4, and ensuring all sequential execution;
s6, the upper computer judges the test data and generates a test report;
s7, testing is completed.
The technical scheme shows that the application has the following beneficial effects:
according to the application, the serial port communication interface is controlled by the set value of the upper computer, so that the analog signal output by the wide oxygen sensor under each working condition can be completely simulated, and compared with the limitation that the actual sensor is limited by the production line testing environment, the automatic test of the wide oxygen signal is realized, and the accuracy and stability of the test are improved.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment contains only one independent technical solution, and that such description is provided for clarity only, and that the technical solutions of the embodiments may be appropriately combined to form other embodiments that will be understood by those skilled in the art.
Claims (10)
1. A wide-area oxygen sensor simulation system comprising a wide-area oxygen sensor including a heater, a nernst cell, and a pump cell, further comprising:
the oxygen sensor simulator comprises an oxygen sensor simulator main body, wherein a stabilized voltage power supply, an MCU, a control module and a communication module are arranged in the oxygen sensor simulator main body, the stabilized voltage power supply is electrically connected with the MCU, and the control module and the communication module are both connected with the MCU in a bidirectional manner;
the upper computer is connected with the communication module in a bidirectional way through a cable;
the LoaderBox is connected with the upper computer in a bidirectional way;
PICU controller respectively with control module with loaderBox two-way connection.
2. The system of claim 1, wherein the control module comprises a pump voltage output module, a pump resistance output module, a pump current acquisition module and a heating signal acquisition module, wherein the pump voltage output module is used for simulating the voltage change of the nernst battery and controlling the magnitude of the pump current, the pump resistance output module is used for simulating the internal resistance change of the nernst battery and controlling the heating duty cycle signal, and the pump current acquisition module is used for acquiring the magnitude of the pump current.
3. The analog system of claim 2, wherein the communication module comprises an RS485 isolator, the RS485 isolator is connected to the UART end of the MCU, and the RS485 isolator is connected with a communication interface.
4. A wide-area oxygen sensor simulation system according to claim 3, wherein the oxygen sensor simulator body is further connected with a wide oxygen interface, and the wide oxygen interface is connected with the control module.
5. The analog system of claim 4, wherein the PICU controller includes an interface chip and a PICU master control unit, the PICU controller is connected to the control module, and the interface chip is bi-directionally connected to the PICU master control unit.
6. The system according to claim 5, wherein after the heating energy stoneley cell is in an operating state, the internal resistance is stabilized at 300 Ω, the MCU controls the duty ratio of the heating signal by detecting the magnitude of the internal resistance, the heating signal acquisition module changes the output impedance of the pump resistor output module by detecting the duty ratio of the heating signal, and the duty ratio of the heating signal is controlled in a closed loop manner for controlling the internal resistance of the energy stoneley cell and the heating signal.
7. The analog system of claim 6, wherein the pump current collection module collects the pump current and converts the pump current into voltage, the converted voltage is added with the DAC end output voltage of the MCU by using the op amp adder circuit and then sent to the interface chip, the interface chip controls the pump current, the closed loop stable pump voltage is output at 450mv, and the MCU reads the pump current value and sends it to the host computer.
8. The system for simulating the wide-area oxygen sensor according to claim 7, wherein the oxygen sensor simulator main body is communicated with the upper computer through the communication module, the upper computer controls the MCU in the oxygen sensor simulator main body through the issuing instruction, the MCU modifies the DAC end control output value of the MCU after identifying the instruction, the interface chip outputs corresponding pump current and feeds data back to the upper computer through the bus, and the upper computer judges the working condition of the interface chip through comparing the set pump current and the feedback pump current to finish the test.
9. The analog system of claim 8, wherein the MCU collects the duty cycle of the heating signal in real time, controls the output of the closed loop control pump resistor, and performs duty cycle adjustment after feeding back the controller; and (3) ending the test program, and automatically controlling the pump current output and the pump resistance output through the two-point control.
10. A method of simulating a wide-area oxygen sensor simulation system according to any one of claims 9, comprising the steps of:
s1, a tester presses a travel switch to trigger the start of a test;
s2, an upper computer at the PC end sends a data writing instruction;
s3, the oxygen sensor simulator main body receives the instruction and outputs corresponding analog voltage;
s4, the PICU controller reads the data of the interface chip and sends the data to the upper computer;
s5, executing test stages of working conditions S2-S4, and ensuring all sequential execution;
s6, the upper computer judges the test data and generates a test report;
s7, testing is completed.
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| CN202311276610.XA CN117192179A (en) | 2023-10-05 | 2023-10-05 | Simulation system of wide-range oxygen sensor and simulation method of wide-range oxygen signal |
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| CN202311276610.XA CN117192179A (en) | 2023-10-05 | 2023-10-05 | Simulation system of wide-range oxygen sensor and simulation method of wide-range oxygen signal |
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Cited By (1)
| 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 |
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- 2023-10-05 CN CN202311276610.XA patent/CN117192179A/en active Pending
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 |
| 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 |
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