CN101644199B - Method and device for simulating faults of zirconia-type oxygen sensor for electronic injection engine - Google Patents
Method and device for simulating faults of zirconia-type oxygen sensor for electronic injection engine Download PDFInfo
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- CN101644199B CN101644199B CN 200910063796 CN200910063796A CN101644199B CN 101644199 B CN101644199 B CN 101644199B CN 200910063796 CN200910063796 CN 200910063796 CN 200910063796 A CN200910063796 A CN 200910063796A CN 101644199 B CN101644199 B CN 101644199B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000001301 oxygen Substances 0.000 title claims abstract description 61
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 61
- 238000002347 injection Methods 0.000 title claims abstract description 21
- 239000007924 injection Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004088 simulation Methods 0.000 claims abstract description 45
- 230000004044 response Effects 0.000 claims abstract description 12
- 230000000630 rising effect Effects 0.000 claims abstract description 5
- 239000000446 fuel Substances 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 230000011664 signaling Effects 0.000 claims description 3
- 238000010977 unit operation Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000012774 diagnostic algorithm Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 oxonium ion Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000013456 study Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention relates to a method and a device for simulating faults of a zirconia-type oxygen sensor for an electronic injection engine. The oxygen sensor (comprising a front oxygen sensor or a rear oxygen sensor or both the oxygen sensor and the rear oxygen sensor) for the electronic injection engine can generate independent fault-simulating modes, such as upper-limited voltage upward bias, upper-limited voltage downward bias, lower-limited voltage upward bias, lower-limited voltage downward bias, time response delay, rising edge rising slope change and falling edge falling slope change and mixed fault-simulating modes mixing the four fault modes of upper-limited voltage bias, lower-limited voltage bias, time response delay and slope change in any proportion so that fault simulation signal output is further accordant with practical fault signal output of the oxygen sensor, and the development and the authentication of an OBD system and the needs for other related search are facilitated.
Description
Technical field
The invention belongs to a kind of electronic fuel injection engine (electric control gasoline injection engine) test instrument, especially a kind of simulating faults of zirconia-type oxygen sensor for electronic injection engine method and device of making.
Background technique
According to Abgasgesetz GB18352.3-2005 " light-duty vehicle pollutant emission limit and the method for measurement " requirement in issue on April 27th, 2005 of China national environmental protection general bureau and State Administration for Quality Supervision and Inspection and Quarantine; China implemented in full the phase III emission standard in 2008; light-duty vehicle must be equipped On-board diagnostic (OBD, onboard diagnostic system).According to rules and regulations, the parts of onboard diagnostic system monitoring comprise: three way catalytic converter, lambda sensor, engine fire rate, emission control parts and system and any circuit relevant with discharging.
Lambda sensor is the abbreviation of exhaust gas oxygen sensor (Exhaust Gas Oxygen Sensor, EGO), and its function is the air fuel ratio signal that obtains mixed gas by the content of oxonium ion in the monitoring exhaust, and is electrical signal input ECU with this signal transition.ECU is according to oxygen sensor signal, injection time is revised, realize air-fuel ratio feedback control (closed loop control), thereby between excess air coefficient (λ) is controlled at 0.98～1.02 (air fuel ratio A/F is about 14.7), make motor obtain the mixed gas of optium concentration, thereby reach the discharge amount of reduction harmful gas and the purpose of capable of saving fuel oil.
In electronic fuel injection engine, the OBD system needs the oxygen sensor signal that electrical control system for engine adopts is carried out Real-Time Monitoring, in case find that the oxygen sensor signal of electrical control system for engine is undesired, the OBD system will report to the police.In electrical control system for engine, the lambda sensor that uses at present can be divided into two large types: one) zirconia-type oxygen sensor, zirconia-type oxygen sensor are the variations that the variation of the oxygen molecule content in the waste gas is converted to voltage.Two) titanium oxide type oxygen sensor, titanium dioxide type lambda sensor then are the variations that the variation of the oxygen molecule content in the waste gas is converted to sensor resistance.Following lambda sensor all refers to zirconia-type oxygen sensor.
Under following three kinds of occasions, need to make the lambda sensor of electronic fuel injection engine produce fault: one) when the oxygen sensor signal monitoring function of exploitation OBD system, to need motor to want aerobic sensor fault phenomenon.When two) whether effectively monitoring the lambda sensor fault at the checking new car or in the OBD system with car, also need to make the lambda sensor fault of motor.Three) be used for test and the checking of the dioxygen sensor diagnostic algorithm of triple mode catalytic converter fault diagnosis.These faults are difficult to produce in the lambda sensor of the new electronic fuel injection engine of a cover, and are difficult to produce quantitative lambda sensor fault.
Chinese invention patent " a kind of oxygen sensor of electric control gasoline injection engine fault generating method and the device " (patent No.: 200710051383.5) need to use independent integrated circuit board and removable computer and 220v power supply, give with the car use and bring inconvenient part; Also there are the shortcomings such as the fault simulation form is few.
Summary of the invention
The present invention is directed to the electronic fuel injection engine control system, purpose provide a kind of make electronic fuel injection engine with lambda sensor produce on the upper voltage limit under skew, the upper voltage limit skew under skew, the lower voltage limit, time response postpone on skew, the lower voltage limit, the rate of rise of rising edge changes and the descending slope of trailing edge changes independent failure simulation model and upper voltage limit skew, lower voltage limit skew, postpone time response and slope changes the arbitrary proportion mixed fault simulation model of four kinds of fault modes, so that fault simulation signal output more meets with the output of physical fault signal; For use in the exploitation of OBD system and simulating faults of zirconia-type oxygen sensor for electronic injection engine method and the device of the needs of checking and other correlative studys.。
To achieve these goals, the method applied in the present invention is: disconnect the signaling line that is connected between lambda sensor and the ECU (ECU (Electrical Control Unit)), a lambda sensor failure simulation device is set between lambda sensor and ECU, the signal of lambda sensor output is not directly inputted ECU, and directly input the lambda sensor failure simulation device, the lambda sensor failure simulation device is sampled to the signal of lambda sensor output by A/D converter, the main control unit of lambda sensor failure simulation device is superimposed voltage shifted signal or operating lag signal or while superimposed voltage shifted signal and operating lag signal on the basis of this signal, make it to produce the analogue signal of lambda sensor fault, then utilize the signal after D/A converter is processed this to export to electronic fuel injection engine ECU.
Above-mentioned lambda sensor failure simulation device is by main control singlechip, the D/A output module, LCD MODULE, module is set parameter and master system consists of, wherein the A/D of main control singlechip sampling input end links to each other with the output signal of lambda sensor, the D/A output module links to each other with common I/O mouth with the SPI mouth of main control singlechip, LCD MODULE links to each other with the I/O mouth of main control singlechip, parameter arranges module and links to each other with the I/O mouth of main control singlechip, and master system links to each other by the RS232 serial ports with main control singlechip.
The lambda sensor failure simulation device is by LCD MODULE J1, main control singlechip U1, and D/A conversion chip U2, electrical level transferring chip U3, button B1～B6, resistance R 1-R6, capacitor C 1-C8 consists of, wherein:
Cut-off signal connecting line between lambda sensor and ECU directly accesses the lambda sensor failure simulation device with the lambda sensor output signal, links to each other with the A/D mouth of main control singlechip; The data port of LCD MODULE links to each other with main control singlechip, control mouthful RST, INT, BUSY, CS2, CS1, RD, WR, RS link to each other with the common I/O mouth of main control singlechip, the T1I of electrical level transferring chip, resistance R 10 link to each other with serial ports TXD0, the RXD0 of main control singlechip, and button output B1-B6 links to each other with the common I/O mouth of main control singlechip; The control mouth SDI of D/A conversion chip, CLK, CS, DACS, REG, RSET link to each other with SCK with the MOSI of the SPI mouth of main control singlechip respectively and common I/O mouth links to each other, and delivery outlet OUTA, the OUTB of D/A conversion chip links to each other with the input interface of ECU.
Description of drawings
Fig. 1 is principle of the present invention and connection diagram.
Fig. 2 is electrical connection diagram of the present invention.
Fig. 3 is skew phenomenon of the failure figure on the oxygen sensor signal upper voltage limit of the present invention.
Fig. 4 is skew phenomenon of the failure figure under the oxygen sensor signal upper voltage limit of the present invention.
Fig. 5 is skew phenomenon of the failure figure on the oxygen sensor signal lower voltage limit of the present invention.
Fig. 6 is skew phenomenon of the failure figure on the oxygen sensor signal lower voltage limit of the present invention.
Fig. 7 is oxygen sensor signal delay fault time response phenomenon figure of the present invention.
Fig. 8 is that oxygen sensor signal slope of the present invention changes phenomenon of the failure figure.
Fig. 9 is oxygen sensor signal mixed mode fault simulation phenomenon figure of the present invention
Among Fig. 1: 1,2-heater wire, 3,4-signaling line.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples, but this embodiment should not be construed as limitation of the present invention.
According to Fig. 1, Fig. 2, lambda sensor failure simulation device are installed between lambda sensor and the ECU (Electrical Control Unit) ECU, and lambda sensor heater wire 1,2 still links to each other with ECU, and the fault generating means is not controlled heater wire; Oxygen sensor signal ground 3 still links to each other with ECU, processes altogether with the power supply ground of failure simulation device; Oxygen sensor signal output line 4 disconnect with ECU between be connected, the output signal of lambda sensor is input to the A/D sampling channel of failure simulation device main control singlechip, main control singlechip is sampled to oxygen sensor signal take 10ms as the cycle, analogue signal is changed into digital signal, and with the LCD MODULE real-time update and show sampled signal and send sampled signal by serial ports to master system, master control system is carried out the scale conversion to the digital quantity signal that gathers, after variation processing and operating lag are processed, output to the D/A modular converter and be converted to analog output to the ECU of electronic fuel injection engine.
Master system software of the present invention.The lambda sensor failure simulation device has two kinds of operating modes: unit operation and on-line execute.Unit operation pattern: use separately the lambda sensor simulator to carry out the lambda sensor fault simulation.The on-line execute pattern: it is rear by upper computer software realization lambda sensor fault simulation that the lambda sensor failure simulation device is linked to each other with master system.
Relevant parameter under this pattern is set to:
Upper limit skew: be used for arranging on the lambda sensor trouble signal upper limit side-play amount under side-play amount or the upper limit, the scope of skew is 0～± 0.3V, degree of regulation is 0.02v;
Lower limit skew: be used for arranging on the lambda sensor trouble signal lower limit side-play amount under side-play amount or the lower limit, the scope of skew is 0～± 0.3V, degree of regulation is 0.02v;
Time lag: be used for arranging the lambda sensor trouble signal and postpone time response, the scope of delay is 0～2S, and degree of regulation is 0.01s;
Smooth-going processing: be used for arranging lambda sensor trouble signal digital filtering and mean value processing, be used for regulating oxygen sensor signal rising edge or trailing edge slope, regulation range is 0～20, and degree of regulation is 1;
Normal operation: normal mode of operation.
Fig. 3 shows is skew phenomenon of the failure figure on the oxygen sensor signal upper voltage limit realized of the present invention, the oxygen sensor signal of thick black line for gathering among the figure, and fine rule be the lambda sensor fault simulation signal of exporting after treatment.When producing fault shown in Figure 4, take 0.3V as basic point, to upper offset voltage signal of input signal stack, the output signal stack amount that input voltage calculates when 0.3V is 0, the difference of voltage signal and 0.3V is larger, and the upper stack amount that the output signal of then calculating occurs is larger, thereby realizes being offset on the upper voltage limit, the regulation range of stack amount is 0-0.3V, and degree of regulation is 0.02V.
Fig. 4 shows is skew phenomenon of the failure figure under the oxygen sensor signal upper voltage limit realized of the present invention, the oxygen sensor signal of thick black line for gathering among the figure, and fine rule be the lambda sensor fault simulation signal of exporting after treatment.When producing fault shown in Figure 5, take 0.3V as basic point, to lower offset voltage signal of input signal stack, the stack amount that the output signal that input voltage calculates when 0.3V occurs is 0, the difference of signal voltage and 0.3V is larger, and the lower stack amount that the output signal of then calculating occurs is larger, thereby realizes being offset under the upper voltage limit, the regulation range of stack amount is 0-0.3V, and degree of regulation is 0.02V.
Fig. 5 shows is skew phenomenon of the failure figure on the oxygen sensor signal lower voltage limit realized of the present invention, the oxygen sensor signal of thick black line for gathering among the figure, and fine rule be the lambda sensor fault simulation signal of exporting after treatment.When producing fault shown in Figure 6, take 0.7V as basic point, to upper offset voltage signal of input signal stack, the stack amount that the output signal that input voltage calculates when 0.7V occurs is 0, the difference of signal voltage and 0.7V is larger, and the upper stack amount that the output signal of then calculating occurs is larger, thereby realizes being offset on the lower voltage limit, the regulation range of stack amount is 0-0.3V, and degree of regulation is 0.02V.
Fig. 6 shows is skew phenomenon of the failure figure under the oxygen sensor signal lower voltage limit realized of the present invention, the oxygen sensor signal of thick black line for gathering among the figure, and fine rule be the lambda sensor fault simulation signal of exporting after treatment.When producing fault shown in Figure 7, take 0.7V as basic point, voltage signal to a lower skew of input signal stack, the stack amount that the output signal that input voltage is calculated when 0.7V occurs is 0, the difference of signal voltage and 0.7V is larger, and the lower stack amount that the output signal of then calculating occurs is larger, thereby realizes being offset under the lower voltage limit, the regulation range of stack amount is 0-0.3V, and degree of regulation is 0.02V.
That Fig. 7 shows is the oxygen sensor signal delay fault time response phenomenon figure that the present invention realizes.The oxygen sensor signal of thick black line for gathering among the figure, fine rule is lambda sensor fault simulation signal after treatment.After master control system collects oxygen sensor signal, the oxygen sensor signal that gathers in the t0 is for the previous period preserved, and export a fixed-analog signal in the period to ECU at this section, after reaching the retard time of setting, the signal of preserving is carried out D/A output by the principle of first in first out, thereby change the cycle of oxygen sensor signal output, realize the fault simulation of oxygen sensor aging.Can change by change t0 the output cycle of oxygen sensor signal, the regulation range of time t0 is 0～2S, and degree of regulation is 0.01s.
What Fig. 8 showed is that the oxygen sensor signal slope that the present invention realizes changes phenomenon of the failure figure.The oxygen sensor signal of thick black line for gathering among the figure, fine rule is lambda sensor fault simulation signal after treatment.After master control system collects oxygen sensor signal, calculate for the previous period mean value of the interior oxygen sensor signal that gathers of t1, by the mean value of signal being processed change the slope that oxygen sensor signal rises or descends, again this mean value is exported to ECU by the D/A modular converter.Change the variation slope of oxygen sensor signal by changing t1, the regulation range 0～20 of time t1.
That Fig. 9 shows is the oxygen sensor signal mixed fault pattern phenomenon of the failure figure that the present invention realizes.The oxygen sensor signal of thick black line for gathering among the figure, fine rule is lambda sensor fault simulation signal after treatment.After master control system collects oxygen sensor signal, respectively the signal that samples is carried out being offset and postponing three kinds of fault simulations time response under skew, the lower voltage limit on the upper voltage limit superposeing, master control system is exported to ECU with this signal by the D/A modular converter.The parameters of adjusting respectively three kinds of fault modes is realized the output of the fault simulation signal of different blended composition and division in a proportion.
The content that is not described in detail in this specification belongs to the known prior art of related domain professional and technical personnel.
Claims (3)
1. zirconia-type oxygen sensor for electronic injection engine fault generating method, the method that adopts is: disconnect the signaling line that is connected between lambda sensor and the ECU (Electrical Control Unit) ECU, a lambda sensor failure simulation device is set between lambda sensor and ECU, the signal of lambda sensor output is not directly inputted ECU, and directly input the lambda sensor failure simulation device, the lambda sensor failure simulation device is sampled to the signal of lambda sensor output by A/D converter, the main control unit of lambda sensor failure simulation device is superimposed voltage shifted signal or operating lag signal or while superimposed voltage shifted signal and operating lag signal on the basis of this signal, make it to produce the analogue signal of lambda sensor fault, then utilize the signal after D/A converter is processed this to export to electronic fuel injection engine ECU, it is characterized in that: there are two kinds of operating modes in described method, unit independent operating and on-line execute, the unit operation pattern refers to use separately the lambda sensor simulator to carry out the lambda sensor fault simulation, by parameter module is set and sets corresponding parameter, show normal signal and fault simulation signal by LCD MODULE; The on-line execute pattern refers to the lambda sensor failure simulation device is linked to each other with master system rear by upper computer software realization lambda sensor fault simulation, set the parameter of fault simulation by master system software, show normal signal and fault simulation signal by master system software, and preserve simultaneously normal signal and trouble signal.
2. zirconia-type oxygen sensor for electronic injection engine fault generating method as claimed in claim 1 is characterized in that: described lambda sensor failure simulation device can make that lambda sensor produces on the upper voltage limit under skew, the upper voltage limit skew under skew, the lower voltage limit, time response postpone on skew, the lower voltage limit, the rate of rise of rising edge changes and the descending slope of trailing edge changes independent failure simulation model and upper voltage limit skew, lower voltage limit skew, postpone time response and slope changes the arbitrary proportion mixed fault simulation model of four kinds of fault modes.
3. zirconia-type oxygen sensor for electronic injection engine fault generating method as claimed in claim 1 or 2, it is characterized in that: described lambda sensor failure simulation device is by main control singlechip, the D/A output module, LCD MODULE, module is set parameter and master system consists of, wherein the A/D of main control singlechip sampling input end links to each other with the output signal of lambda sensor, LCD MODULE links to each other with the I/O mouth of main control singlechip, parameter arranges module and links to each other with the I/O mouth of main control singlechip, master system links to each other by the RS232 serial ports with main control singlechip, the D/A output module links to each other with common I/O mouth with the SPI mouth of main control singlechip, described main control unit is by sampling to oxygen sensor signal, by to the skew of this signal superimposed voltage postpone time response or simultaneously the superimposed voltage shifted signal and time response delay signal realize the simulation of trouble signal, the signal after the processing is exported to ECU by the D/A modular converter.
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| CN102411311B (en) * | 2011-08-23 | 2014-10-08 | 意昂神州（北京）科技有限公司 | Oxygen sensor failure simulator and oxygen sensor failure simulation method |
| DE102012211687B4 (en) * | 2012-07-05 | 2024-03-21 | Robert Bosch Gmbh | Method and control unit for detecting a voltage offset of a voltage lambda characteristic curve |
| CN104977920B (en) * | 2014-04-04 | 2017-09-26 | 联创汽车电子有限公司 | Broad domain oxygen sensor loads simulator |
| CN109932604A (en) * | 2019-04-03 | 2019-06-25 | 武汉菱电汽车电控系统股份有限公司 | Wide oxygen failure simulation method, apparatus and system |
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Correction item: Patentee|Address Correct: WUHAN Research Institute OF NEW ENERGY AUTOMOTIVE TECHNOLOGIES|430056 3rd Floor, Building 2, High-tech Industrial Park, Wuhan Economic and Technological Development Zone, Hubei Province False: Wuhan new energy automobile industry technology research institute|430056 3rd Floor, Building 2, High-tech Industrial Park, Wuhan Economic and Technological Development Zone, Hubei Province Number: 31 Volume: 30 |
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Address after: 430056 3rd Floor, Building 2, High-tech Industrial Park, Wuhan Economic and Technological Development Zone, Hubei Province Patentee after: Wuhan Jingkai Kechuang Operation Co.,Ltd. Address before: 430056 3rd Floor, Building 2, High-tech Industrial Park, Wuhan Economic and Technological Development Zone, Hubei Province Patentee before: WUHAN Research Institute OF NEW ENERGY AUTOMOTIVE TECHNOLOGIES |
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Effective date of registration: 20231107 Address after: No. 122, Lo lion Road, Hongshan District, Wuhan, Hubei Patentee after: Wuhan University of Technology Education Development Foundation Address before: No. 122, Lo lion Road, Hongshan District, Wuhan, Hubei Patentee before: Wuhan Institute of Technology Industry Group Co.,Ltd. Effective date of registration: 20231107 Address after: No. 122, Lo lion Road, Hongshan District, Wuhan, Hubei Patentee after: Wuhan Institute of Technology Industry Group Co.,Ltd. Address before: 430056 3rd Floor, Building 2, High-tech Industrial Park, Wuhan Economic and Technological Development Zone, Hubei Province Patentee before: Wuhan Jingkai Kechuang Operation Co.,Ltd. |