CN106150725A - A kind of broad domain oxygen sensor controller - Google Patents
A kind of broad domain oxygen sensor controller Download PDFInfo
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- CN106150725A CN106150725A CN201610637514.7A CN201610637514A CN106150725A CN 106150725 A CN106150725 A CN 106150725A CN 201610637514 A CN201610637514 A CN 201610637514A CN 106150725 A CN106150725 A CN 106150725A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 239000001301 oxygen Substances 0.000 title claims abstract description 104
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 104
- 238000005259 measurement Methods 0.000 claims abstract description 28
- 239000000446 fuel Substances 0.000 claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 238000012545 processing Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 10
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 238000009529 body temperature measurement Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1493—Details
- F02D41/1494—Control of sensor heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1917—Control of temperature characterised by the use of electric means using digital means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The invention discloses a kind of broad domain oxygen sensor controller, including for integrated interface circuit module, heat driven module and microcontroller；Integrated interface circuit module realizes the internal resistance measurement of broad domain oxygen sensor sensing unit and exports corresponding voltage signal, measure the voltage signal that broad domain oxygen sensor sensing unit produces simultaneously, realize the control of pump unit the pump electric current detecting on control loop, export corresponding voltage signal；The aforementioned corresponding voltage signal of microcontroller detection, it is achieved temperature control and pump electric current number are processed, and export corresponding air-fuel ratio information.The present invention uses hardware design and the temperature control realization of integrated interface circuit module reduction broad domain oxygen sensor, improves broad domain oxygen sensor accuracy of detection.
Description
Technical Field
The invention belongs to the field of automobile electronic sensing detection, and particularly relates to a wide-range oxygen sensor controller.
Background
With the rapid development of economy, the quantity of automobile reserves in all countries of the world is rapidly increased, and the trend improves the living standard of residents, but also aggravates the problems of environmental pollution and energy shortage. The exhaust gas emitted from automobiles mainly contains harmful gases and substances such as CO, NOx, SOx and PM2.5, which are the main causes of greenhouse effect and haze formation. A wide-range oxygen sensor, called lambda (air fuel ratio) sensor for short, is a device for detecting the oxygen content of automobile exhaust which is most widely applied in reality, and improves the combustion performance of an engine by detecting the oxygen concentration in the automobile exhaust and feeding back the detection result to an Electronic Control Unit (ECU) of the engine, and simultaneously improves the catalytic efficiency of a three-way catalyst in an automobile exhaust treatment system and reduces the emission of harmful gases. The high-performance wide-range oxygen sensor controller is the key for ensuring the detection accuracy of the wide-range oxygen sensor, so the design and development of the wide-range oxygen sensor controller are particularly important.
By searching the existing literature, research on the wide-area oxygen sensor is found to be mainly focused on the internal material and internal measurement structure of the wide-area oxygen sensor and the production and manufacturing aspects. Meanwhile, the research on the aspect of wide-area oxygen sensor controllers in China has no systematicness, for example, a control and signal acquisition circuit of a wide-area oxygen sensor pump unit of an automobile engine, which is disclosed by Yangzhou Qingma automobile company Limited, only provides a hardware design aiming at a certain module in the controller.
The basic operating principle of the wide-area oxygen sensor, the operating temperature characteristics and the composition and electrochemical characteristics thereof in terms of materials are substantially in accordance with the characteristics of the solid oxide fuel cell. The controller of the wide-area oxygen sensor is developed to comprise two aspects of temperature control and pump unit control, wherein the difficulty of the temperature control is temperature measurement and control, the measurement and control can refer to the temperature measurement and control of the solid oxide fuel cell, namely the temperature measurement is realized based on the resistance temperature characteristic of the zirconia substrate material, and the temperature feedback control is carried out.
The existing research on wide-area oxygen sensor controllers at home and abroad has the following defects: (1) the development of the wide-area oxygen sensor controller has no systematicness, and only aims at partial functions of the controller to carry out development and analog simulation; (2) the existing wide-area oxygen sensor controller is not strong enough in compatibility, is mainly developed aiming at a specific model of product, and cannot be well compatible with series of products. (3) The developed controller is functionally realized, but the control measurement precision cannot reach the level of a foreign controller.
Disclosure of Invention
Aiming at the defects of the development of the existing wide-area oxygen sensor controller, the invention combines the basic working and temperature control requirements of the solid oxide fuel cell and the wide-area oxygen sensor, provides the wide-area oxygen sensor controller designed based on the integrated interface circuit module, simplifies the signal acquisition of the wide-area sensor and the control of the pump unit, improves the control performance of the wide-area sensor controller and the detection precision of the wide-area sensor, and simultaneously enhances the compatibility of the wide-area oxygen sensor controller.
To achieve the above object, the present invention proposes a wide-area oxygen sensor controller for a solid oxide fuel cell, the controller comprising: the system comprises an integrated interface circuit module, a heating driving module and a microcontroller; wherein,
the integrated interface circuit module is connected with an electrode of the wide-area oxygen sensor through a signal wire, loads current signals through the Nernst electrode and the reference electrode to measure the internal resistance of the sensing unit of the wide-area oxygen sensor, and outputs corresponding internal resistance measuring voltage signals to the microcontroller; meanwhile, the integrated interface circuit module outputs a pump voltage control signal to a pump unit of the wide-area oxygen sensor, detects a current signal on a control loop, and outputs a pump current detection voltage signal which is in a linear relation with the pump current to the microcontroller;
the microcontroller is respectively connected with the integrated interface circuit module and the heating driving module and is used for acquiring an internal resistance measurement voltage signal of the wide-area oxygen sensor and a pump current detection voltage signal which is in linear relation with the pump current, performing control operation processing and outputting a temperature control signal to the heating driving module; meanwhile, the microcontroller also obtains the oxygen concentration and the A/F value of the air-fuel ratio through operation processing, and converts the oxygen concentration and the A/F value into analog voltage signals to be output;
the thermal driving module is connected with the heater of the wide-area oxygen sensor and used for controlling the heater according to the temperature control signal.
Further, the integrated interface circuit module includes:
and the pump unit voltage control signal output submodule is used for taking a deviation value of a measured voltage signal on a Nernst electrode and a Nernst reference voltage set in the Nernst electrode as an input of PID operation, and outputting a pump unit voltage control signal to a wide-area oxygen sensor pump electrode (pump) through PID operation processing.
The internal resistance measurement voltage signal output submodule is used for outputting current signals to the Nernst electrode and the internal resistance measurement reference resistor respectively to obtain an internal resistance measurement voltage signal and outputting the internal resistance measurement voltage signal to the microcontroller;
and the pump current detection voltage signal output submodule is used for detecting a current signal on a control loop of the wide-area oxygen sensor pump unit, carrying out amplification linearization processing on the voltage signal, and outputting a pump current detection voltage signal which is in linear relation with the pump current to the microcontroller.
Furthermore, the microcontroller comprises an A/D conversion module, a data processing module, a D/A conversion module and a temperature control module; wherein,
the A/D conversion module is used for receiving and performing analog-to-digital conversion on the internal resistance measurement voltage signal and the pump current detection voltage signal;
the data processing module is used for carrying out operation processing according to the signals converted by the A/D conversion module to obtain the oxygen concentration and the air-fuel ratio;
the D/A conversion module is used for converting the oxygen concentration and the air-fuel ratio into corresponding analog voltage signals and outputting the analog voltage signals;
and the temperature control module is used for carrying out temperature PID control operation according to the internal resistance measurement voltage signal converted by the A/D conversion module and outputting a temperature control signal to the heating driving module.
Further, the system also comprises a display module for displaying the oxygen concentration and the air-fuel ratio.
Further, the system also comprises a communication module used for sending the oxygen concentration and the air-fuel ratio to upper computer software.
Further, the system also comprises a model switching combination switch which is used for changing the working mode of the wide-area oxygen sensor to make the wide-area oxygen sensor compatible with oxygen sensors of different models.
Further, the temperature control signal is a pulse width modulation signal.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
(1) according to the method for measuring the working temperature characteristic and the internal resistance of the battery, the integrated interface circuit module is designed to realize the signal acquisition of the wide-area oxygen sensor and the control of the pump unit, the hardware circuit design and the temperature measurement and control of the wide-area oxygen sensor controller are simplified, and the control performance of the wide-area oxygen sensor and the detection performance of the wide-area oxygen sensor are further improved;
(2) in addition, the temperature control of the wide-area oxygen sensor in the system is realized by adopting PWM control, so that the temperature control precision is higher;
(3) the wide-area oxygen sensor controller control system designed based on the invention CAN output the detected oxygen concentration O in an analog voltage form and a CAN bus or serial port communication mode2The values and the air-fuel ratio A/F are sent to an upper computer monitoring software.
Drawings
FIG. 1 is a block diagram of a wide area oxygen sensor controller;
FIG. 2 is a diagram of a CJ125 IC of a preferred embodiment of a wide area oxygen sensor controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the left side 1 of the diagram is a schematic diagram of a wide-area oxygen sensor, and the right side 2 is a structural diagram of a controller of the wide-area oxygen sensor.
The controller includes: the integrated interface circuit module 3, the heating driving module 4 and the microcontroller 5; wherein:
the integrated interface circuit module 3 is connected with the electrode of the wide-area oxygen sensor through a signal wire, loads current signals through the Nernst electrode and the reference electrode to measure the internal resistance of the sensing unit of the wide-area oxygen sensor, and outputs corresponding internal resistance measurement voltage signals to the microcontroller 5; meanwhile, the integrated interface circuit module 3 outputs a pump voltage control signal to the pump unit of the wide-area oxygen sensor, detects a current signal on the control loop, and outputs a pump current detection voltage signal in a linear relationship with the pump current to the microcontroller 5.
The microcontroller 5 is respectively connected with the integrated interface circuit module 3 and the heating driving module 4 and is used for acquiring an internal resistance measurement voltage signal of the wide-area oxygen sensor and a pump current detection voltage signal which is in a linear relation with the pump current, performing control operation processing and outputting a temperature control signal to the heating driving module 4; meanwhile, the microcontroller 5 also obtains the oxygen concentration and the air-fuel ratio A/F value through operation processing, and converts the oxygen concentration and the air-fuel ratio A/F value into analog voltage signals for output.
The heating driving module 4 is connected with a heater of the wide-area oxygen sensor and used for controlling the heater according to the temperature control signal.
The microcontroller 5 comprises an A/D conversion module 9, a data processing module 10, a D/A conversion module 11 and a temperature control module 12; the a/D conversion module 9 is configured to receive and analog-to-digital convert the internal resistance measurement voltage signal and the pump current detection voltage signal; the data processing module 10 is configured to perform operation processing according to the signal converted by the a/D conversion module 9 to obtain an oxygen concentration and an air-fuel ratio; the D/A conversion module 11 is used for converting the oxygen concentration O2% value and the air-fuel ratio A/F value into corresponding analog voltage signals to be output; the temperature control module 12 is configured to perform temperature PID control operation according to the internal resistance measurement voltage signal converted by the a/D conversion module 9, and output a temperature control signal to the heating driving module 4.
The system also includes a display module 6 for displaying the oxygen concentration and the air-fuel ratio.
The system also includes a communication module 7 for sending the oxygen concentration and the air-fuel ratio to the upper computer software.
The system also includes a model selector combination switch 14 for changing the operating mode of the wide-area oxygen sensor to be compatible with different models of oxygen sensors.
The wide-area oxygen sensor may be selected from, for example, the Bosch LSU series of LSU4.2 and LSU4.9 models.
CJ125 IC module 3 is an IC module developed by Bosch company for wide-area oxygen sensor controller design, and CJ135 IC module can be selected in practical application. FIG. 2 is a diagram of a typical application circuit based on CJ125, connecting a wide area oxygen sensor with CJ125 module 3, and connecting a measurement signal output port, a control port and an SPI communication port of CJ125 with controller unit 5; in the embodiment, STM32F103VET6 is selected as a main controller, and a microcontroller is constructed based on the minimum system; the display device adopts an eight-bit LCD display screen; the heating driving module is realized based on a power Mos tube, and the maximum power is more than 40W; the communication module is realized by adopting an RS232 serial port communication mode.
The CJ125 integrated interface circuit module outputs a constant current signal to an induction unit of the wide-area oxygen sensor and an internal resistance measurement reference resistor on the one hand, and outputs a corresponding voltage signal to the microcontroller; on the other hand, the CJ125 integrated interface circuit module collects the enable special voltage on the wide-area oxygen sensing unit and compares the enable special voltage with the enable special reference voltage in the wide-area oxygen sensing unit to form deviation as a deviation input signal of the pump unit in the CJ125 integrated interface circuit module for simulating PID control, meanwhile, the CJ125 integrated interface circuit module outputs a pump voltage control signal to be loaded on the pump unit of the wide-area oxygen sensor after the simulation PID control operation, and meanwhile, the CJ125 integrated interface circuit module can detect a pump current signal on a pump unit control loop and output a voltage signal which is in a linear relation with the pump current to the microcontroller. The model switching combination switch is used for selecting the internal resistances of the sensing units corresponding to the LSU4.2 and the LSU4.9 of 80 omega and 300 omega and selecting a trigger signal for the working mode of the microcontroller.
An A/D conversion module integrated in the microcontroller collects an internal resistance measurement voltage signal and a pump current detection voltage signal, on one hand, the microcontroller performs digital PID operation based on the internal resistance measurement voltage signal and outputs a temperature control PWM signal to the heating driving module, and the heating driving module controls the heater power of the wide-area oxygen sensor according to the temperature control signal PWM so as to realize temperature control. In another aspect, a microcontrollerBased on the pump current detection voltage signal, corresponding data processing operation is carried out to obtain the oxygen concentration O2The% value and the air-fuel ratio A/F value are stored. The oxygen concentration O2% value and the air-fuel ratio A/F value can be converted into analog voltage signals by a D/A conversion module integrated in the microcontroller for output, and can also be directly output to a display device for display. In order to expand the product testing function of the wide-area oxygen sensor, the communication module in fig. 1 adopts serial port communication, and the microcontroller can send the oxygen concentration O2% value and the air-fuel ratio A/F value to upper computer software through the communication module.
Based on the scheme, the CJ125 integrated interface circuit module realizes the control of the signal acquisition and pump unit of the wide-area oxygen sensor, replaces a control circuit of the signal acquisition and pump unit formed by common separation components, and the microcontroller only needs to receive the CJ125 integrated interface circuit acquisition internal resistance measurement voltage signal and the pump current detection voltage signal to perform corresponding operation processing, so that the control, data processing and information output of the temperature of the wide-area sensor are realized. Therefore, the wide-area sensor controller designed based on the invention simplifies the signal acquisition of the wide-area sensor and the control of the pump unit, improves the control performance of the wide-area sensor controller and the detection precision of the wide-area sensor, and simultaneously enhances the compatibility of the wide-area oxygen sensor controller.
Claims (7)
1. A wide area oxygen sensor controller, the controller comprising: the heating device comprises an integrated interface circuit module (3), a heating driving module (4) and a microcontroller (5); wherein,
the integrated interface circuit module (3) is connected with an electrode of the wide-area oxygen sensor through a signal wire, loads current signals through the Nernst electrode and the reference electrode to measure the internal resistance of the sensing unit of the wide-area oxygen sensor, and outputs corresponding internal resistance measurement voltage signals to the microcontroller (5); meanwhile, the integrated interface circuit module (3) outputs a pump voltage control signal to a pump unit of the wide-area oxygen sensor, detects a current signal on a control loop, and outputs a pump current detection voltage signal which is in a linear relation with the pump current to the microcontroller (5);
the microcontroller (5) is respectively connected with the integrated interface circuit module (3) and the heating driving module (4) and is used for acquiring an internal resistance measurement voltage signal of the wide-area oxygen sensor and a pump current detection voltage signal which is in linear relation with the pump current, performing control operation processing and outputting a temperature control signal to the heating driving module (4); meanwhile, the microcontroller (5) also obtains the oxygen concentration and the air-fuel ratio A/F value through operation processing, and converts the oxygen concentration and the air-fuel ratio A/F value into analog voltage signals for output;
the heating driving module (4) is connected with a heater of the wide-area oxygen sensor and used for controlling the heater according to the temperature control signal.
2. The wide area oxygen sensor controller of claim 1, wherein the integrated interface circuit module (3) comprises:
the pump unit voltage control signal output submodule is used for taking a deviation value between a measured voltage signal on the Nernst electrode and Nernst reference voltage set in the Nernst electrode as input of PID operation, and outputting a pump unit voltage control signal to the wide-area oxygen sensor pump electrode through PID operation processing;
the internal resistance measurement voltage signal output submodule is used for respectively outputting a current signal to the Nernst electrode and the internal resistance measurement reference resistor to obtain an internal resistance measurement voltage signal and outputting the internal resistance measurement voltage signal to the microcontroller (5);
and the pump current detection voltage signal output submodule is used for detecting a current signal on a control loop of the wide-area oxygen sensor pump unit, carrying out amplification linearization processing on the voltage signal, and outputting a pump current detection voltage signal which is in a linear relation with the pump current to the microcontroller (5).
3. The wide area oxygen sensor controller according to claim 1 or 2, wherein the microcontroller (5) comprises an a/D conversion module (9), a data processing module (10), a D/a conversion module (11) and a temperature control module (12); wherein,
the A/D conversion module (9) is used for receiving and performing analog-to-digital conversion on the internal resistance measurement voltage signal and the pump current detection voltage signal;
the data processing module (10) is used for carrying out operation processing according to the signals converted by the A/D conversion module (9) to obtain the oxygen concentration and the air-fuel ratio;
the D/A conversion module (11) is used for converting the oxygen concentration O2% value and the air-fuel ratio A/F value into corresponding analog voltage signals to be output;
and the temperature control module (12) is used for carrying out temperature PID control operation according to the internal resistance measurement voltage signal converted by the A/D conversion module (9) and outputting a temperature control signal to the heating driving module (4).
4. The wide area oxygen sensor controller of claim 1 or 2, wherein the system further comprises a display module (6) for displaying oxygen concentration and air-fuel ratio.
5. The wide area oxygen sensor controller of claim 1 or 2, wherein the system further comprises a communication module (7) for sending oxygen concentration and air-fuel ratio to the upper computer software.
6. The wide area oxygen sensor controller of claim 1 or 2, wherein the system further comprises a model selector combination switch (14) for changing the operating mode of the wide area oxygen sensor to be compatible with different models of oxygen sensors.
7. The wide area oxygen sensor controller of claim 1 or 2, wherein the temperature control signal is a pulse width modulated signal.
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| CN107121474A (en) * | 2017-05-04 | 2017-09-01 | 宁波大学 | A kind of controller of broad domain oxygen sensor |
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| CN110672331A (en) * | 2019-07-02 | 2020-01-10 | 成都恩吉威汽车技术有限公司 | Wide-range oxygen sensor signal acquisition and signal simulation control unit |
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| CN113323763A (en) * | 2021-06-23 | 2021-08-31 | 合肥工业大学 | Controller of wide-range waste gas oxygen sensor capable of outputting reference pump current |
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