CN110700925B - Vehicle-mounted nitrogen-oxygen sensor fault rate online counting and correcting method - Google Patents
Vehicle-mounted nitrogen-oxygen sensor fault rate online counting and correcting method Download PDFInfo
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- CN110700925B CN110700925B CN201810746244.2A CN201810746244A CN110700925B CN 110700925 B CN110700925 B CN 110700925B CN 201810746244 A CN201810746244 A CN 201810746244A CN 110700925 B CN110700925 B CN 110700925B
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- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012937 correction Methods 0.000 claims abstract description 25
- 238000005457 optimization Methods 0.000 claims abstract description 22
- 230000001052 transient effect Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 abstract description 12
- 239000000523 sample Substances 0.000 description 9
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a method for on-line counting and correcting the fault rate of a vehicle-mounted nitrogen-oxygen sensor, wherein a nitrogen-oxygen controller is matched with an engine controller, the nitrogen-oxygen controller acquires working condition information from the engine controller, when the nitrogen-oxygen controller monitors the fault of the sensor, the working condition information of the engine when the fault occurs is stored, classified counting is carried out, further optimization and correction are carried out according to the counting result aiming at the working condition with higher fault rate, and the working condition area with higher fault rate can be found through counting the working condition when the fault occurs, so that the high fault rate area can be further optimized, the fault rate of the sensor is reduced, statistical data can be sent to maintenance personnel, and the maintenance efficiency and the maintenance accuracy of the maintenance personnel are improved.
Description
Technical Field
The invention belongs to the technical field of automobile exhaust detection, and particularly relates to a method for online counting and correcting the fault rate of a vehicle-mounted nitrogen-oxygen sensor.
Background
In recent two-thirty years, with the rapid increase of automobile keeping quantity in the world, the brought automobile emission pollution is becoming serious. With the upgrading of emission regulations, the demand of nitrogen oxide sensors is increasing. From the current research situation at home and abroad, the probe part is still imperfect in domestic technology and has a large gap with foreign countries, and the probe part is mainly embodied in the aspects of raw material production, production process, signal stability, signal precision, durability and the like.
Aiming at the problems of poor probe durability and high failure rate in China, the invention intelligently monitors and compensates the probe from the controller end so as to optimize the problems.
In the application number: CN201620935887.8, having the filing date of 20160817 names: in a nitrogen oxygen sensor's patent, a nitrogen oxygen sensor is disclosed, which comprises a body, the body includes controller, electric wire and probe, the controller is connected with the probe through the electric wire, the controller is provided with first interface, second interface and extends the piece, first interface all fixes with the second interface on the controller, it fixes to extend the piece the controller both sides, the probe includes contact and fixing bolt, fixing bolt installs at the contact rear end. The probe of the patent is a common probe, and the technical problems proposed above are not solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for on-line counting and correcting the fault rate of a vehicle-mounted nitrogen-oxygen sensor.
The purpose of the invention can be realized by the following technical scheme:
a method for on-line counting and correcting fault rate of a vehicle-mounted nitrogen-oxygen sensor comprises the following steps:
s1: obtaining engine information: the nitrogen-oxygen controller acquires the information of the rotating speed, the torque, the speed and the load of the engine at the moment through messages;
s2: judging the current working condition state: judging whether the engine is in a steady state working condition at present;
under the steady state working condition:
SS 01: and (3) configuring a steady-state working condition counter: dividing 9 areas according to the abscissa vehicle speed and the ordinate load, setting a counter in each area, storing the power-off value of each counter into an EEPROM, and reading the EEPROM value after the power-on;
SS 02: judging a fault freeze frame: when a related fault report of the nitrogen oxygen sensor is wrong, the nitrogen oxygen controller stores a vehicle speed and a load value when the fault occurs and judges the region attribution;
SS 03: and (3) accumulating by a steady-state working condition counter: after the attribution area is confirmed, the counter corresponding to the area is added with 1, and the counter is only accumulated once before each fault is cured;
SS 04: and (3) judging the optimized correction condition of the steady-state working condition: when the value of the counter exceeds a preset value, further optimization correction is carried out on the basis of the original heating and current correction;
SS 05: and (3) optimizing, correcting and calculating the steady-state working condition: the optimization correction coefficient is calculated by the counting value of the counter, and the larger the counting value of the counter is, the higher the optimization coefficient is;
in an unsteady state working condition:
SSS 01: and (3) configuration of a transient working condition counter: if the engine is in an unsteady state, 9 areas are defined according to the rotating speed of the abscissa engine and the torque of the ordinate engine, a counter is set in each area, the power-off value of each counter is stored in an EEPROM, and the EEPROM value is read after the power-on;
SSS 02: judging a fault freeze frame: when the related fault of the nitrogen oxygen sensor is reported to be wrong, the nitrogen oxygen controller stores the rotating speed and the torque value of the engine when the fault occurs and judges the region attribution;
SSS 03: and (3) accumulating by a transient working condition counter: after the attribution area is confirmed, the counter corresponding to the area is added with 1, and the counter is only accumulated once before each fault is cured;
SSS 04: judging the transient working condition optimization correction condition: when the counter value exceeds a calibration value, further optimization correction is carried out on the basis of the original heating and current correction;
SSS 05: optimizing and correcting the transient working condition: the optimization correction coefficient is calculated by the counter value, and the optimization coefficient is higher when the counter value is larger.
The invention has the beneficial effects that:
through working condition statistics when breaking down, can find the higher operating mode region of fault rate, not only can further optimize the high fault rate region in view of the above to reduce sensor fault rate, also can send statistical data for maintenance personal, improve maintenance personal's maintenance efficiency and maintenance degree of accuracy.
Drawings
FIG. 1 is a schematic flow chart of a method for on-line counting and correcting the failure rate of a vehicle-mounted nitrogen-oxygen sensor.
Detailed Description
The technical scheme of the invention is further described by combining the attached drawings:
the nitrogen-oxygen controller is matched with the engine controller, the nitrogen-oxygen controller acquires working condition information from the engine controller, and when the nitrogen-oxygen controller monitors the sensor fault, the engine working condition information when the fault occurs is stored and classified and counted. And according to the statistical result, further optimizing and correcting aiming at the working condition with higher failure rate.
A method for on-line counting and correcting fault rate of a vehicle-mounted nitrogen-oxygen sensor comprises the following steps:
s1: obtaining engine information: the nitrogen-oxygen controller acquires the information of the rotating speed, the torque, the speed and the load of the engine at the moment through messages;
s2: judging the current working condition state: judging whether the engine is in a steady state working condition at present;
SS 01: and (3) configuring a steady-state working condition counter: if the vehicle is in a steady state working condition, dividing 9 areas according to the horizontal coordinate vehicle speed and the vertical coordinate load, setting a counter in each area, storing the power-off value of each counter into an EEPROM, and reading the EEPROM value after the power-on; the following table I:
| low vehicle speed | Middle speed | High vehicle speed | |
| Low load | Counter 1 | Counter 2 | Counter 3 |
| Middle load | Counter 4 | Counter 5 | Counter 6 |
| High load | Counter 7 | Counter 8 | Counter 9 |
Table one: counter value corresponding to abscissa vehicle speed and ordinate load
SS 02: judging a fault freeze frame: when the related fault report of the nitrogen oxygen sensor is wrong, the nitrogen oxygen controller stores the vehicle speed and the load value when the fault occurs and judges the region attribution;
SS 03: and (3) accumulating by a steady-state working condition counter: after confirming the home zone, the counter corresponding to this zone is incremented by 1. Before each fault is cured, the counter is only accumulated once;
SS 04: and (3) judging the optimized correction condition of the steady-state working condition: when the value of the counter exceeds a preset value, further optimization correction is carried out on the basis of the original heating and current correction;
SS 05: and (3) optimizing, correcting and calculating the steady-state working condition: the optimization correction coefficient is calculated by the counting value of the counter, and the larger the counting value of the counter is, the higher the optimization coefficient is;
SSS 01: and (3) configuration of a transient working condition counter: if the working condition is an unsteady state working condition, dividing 9 areas according to the rotating speed of the abscissa engine and the torque of the ordinate engine, setting a counter in each area, storing the power-off value of each counter into an EEPROM, and reading the EEPROM value after the power-on; the following table two:
| low rotational speed | Middle rotating speed | High rotational speed | |
| Low torque | Counter 10 | Counter 11 | Counter 12 |
| Middle torque | Counter 13 | Counter 14 | Counter 15 |
| High torque | Counter 16 | Counter 17 | Counter 18 |
Table two: counter values corresponding to abscissa vehicle speed and ordinate engine torque
SSS 02: judging a fault freeze frame: when the related fault of the nitrogen oxygen sensor is reported to be wrong, the nitrogen oxygen controller stores the rotating speed and the torque value of the engine when the fault occurs and judges the region attribution;
SSS 03: and (3) accumulating by a transient working condition counter: after the attribution area is confirmed, the counter corresponding to the area is added with 1, and the counter is only accumulated once before each fault is cured;
SSS 04: judging the transient working condition optimization correction condition: when the counter value exceeds a calibration value, further optimization correction is carried out on the basis of the original heating and current correction;
SSS 05: optimizing and correcting the transient working condition: the optimization correction coefficient is calculated by the counter value, and the optimization coefficient is higher when the counter value is larger.
According to the method, the working condition area with higher failure rate can be found through working condition statistics when the failure occurs, so that the high failure rate area can be further optimized, the failure rate of the sensor is reduced, statistical data can be sent to maintenance personnel, and the maintenance efficiency and the maintenance accuracy of the maintenance personnel are improved.
Finally, it should be noted that:
the method may be carried out and its application may be carried out by those skilled in the art with reference to the disclosure herein, and it is expressly intended that all such alternatives and modifications as would be apparent to those skilled in the art are deemed to be included within the invention. While the method and application of the present invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the method and application of the invention as described herein may be made and equivalents employed without departing from the spirit and scope of the invention.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, and the appended claims are intended to cover such modifications and equivalents as fall within the true spirit and scope of the invention.
Claims (1)
1. A method for on-line counting and correcting the fault rate of a vehicle-mounted nitrogen-oxygen sensor,
the method is characterized in that: the method comprises the following steps:
s1: obtaining engine information: the nitrogen-oxygen controller acquires the information of the rotating speed, the torque, the speed and the load of the engine at the moment through messages;
s2: judging the current working condition state: judging whether the engine is in a steady state working condition at present;
under the steady state working condition:
SS 01: and (3) configuring a steady-state working condition counter: dividing 9 areas according to the abscissa vehicle speed and the ordinate load, setting a counter in each area, storing the power-off value of each counter into an EEPROM, and reading the EEPROM value after the power-on;
SS 02: judging a fault freeze frame: when a related fault report of the nitrogen oxygen sensor is wrong, the nitrogen oxygen controller stores a vehicle speed and a load value when the fault occurs and judges the region attribution;
SS 03: and (3) accumulating by a steady-state working condition counter: after the attribution area is confirmed, the counter corresponding to the area is added with 1, and the counter is only accumulated once before each fault is cured;
SS 04: and (3) judging the optimized correction condition of the steady-state working condition: when the value of the counter exceeds a preset value, further optimization correction is carried out on the basis of the original heating and current correction;
SS 05: and (3) optimizing and correcting the steady-state working condition: the optimization correction coefficient is calculated through the count value of the counter, and the larger the count value of the counter is, the higher the optimization coefficient is;
in an unsteady state working condition:
SSS 01: and (3) configuration of a transient working condition counter: if the working condition is an unsteady state working condition, dividing 9 areas according to the rotating speed of the abscissa engine and the torque of the ordinate engine, setting a counter in each area, storing the power-off value of each counter into an EEPROM, and reading the EEPROM value after the power-on;
SSS 02: judging a fault freeze frame: when the related fault of the nitrogen oxygen sensor is reported to be wrong, the nitrogen oxygen controller stores the rotating speed and the torque value of the engine when the fault occurs and judges the region attribution;
SSS 03: and (3) accumulating by a transient working condition counter: after the attribution area is confirmed, the counter corresponding to the area is added with 1, and the counter is only accumulated once before each fault is cured;
SSS 04: judging the transient working condition optimization correction condition: when the counter value exceeds a calibration value, further optimization correction is carried out on the basis of the original heating and current correction;
SSS 05: optimizing and correcting the transient working condition: the optimization correction coefficient is calculated by the counter value, and the optimization coefficient is higher when the counter value is larger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810746244.2A CN110700925B (en) | 2018-07-09 | 2018-07-09 | Vehicle-mounted nitrogen-oxygen sensor fault rate online counting and correcting method |
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| CN201810746244.2A CN110700925B (en) | 2018-07-09 | 2018-07-09 | Vehicle-mounted nitrogen-oxygen sensor fault rate online counting and correcting method |
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| CN113803140B (en) * | 2020-06-11 | 2023-05-23 | 卓品智能科技无锡股份有限公司 | Method for diagnosing credibility of exhaust temperature sensor |
| CN113804825A (en) * | 2020-06-12 | 2021-12-17 | 卓品智能科技无锡有限公司 | Multichannel parallel automatic calibration method and system for vehicle-mounted nitrogen-oxygen sensor |
| CN112285290B (en) * | 2020-10-26 | 2023-02-28 | 无锡沃尔福汽车技术有限公司 | Method for evaluating reasonability of measured value of nitrogen-oxygen sensor |
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| CN100570137C (en) * | 2007-07-26 | 2009-12-16 | 东风汽车有限公司 | Vehicle-mounted real-time statistical method for engine load rate |
| KR100896637B1 (en) * | 2007-09-28 | 2009-05-08 | 콘티넨탈 오토모티브 시스템 주식회사 | Apparatus and method for diagnosing oxygen sensor of car |
| DE102009047550A1 (en) * | 2009-12-04 | 2011-06-09 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Method for determining a failure rate of an electrochemical sensor |
| KR20150140465A (en) * | 2014-06-05 | 2015-12-16 | 현대자동차주식회사 | Method for increasing the efficiency of fault diagnosis in pm sensor |
| CN106289363A (en) * | 2016-08-01 | 2017-01-04 | 长沙理工大学 | A kind of interference environment sensor fault judge mark method |
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