CN113803142A - Method for acquiring key signals of vehicle-mounted nitrogen-oxygen sensor - Google Patents
Method for acquiring key signals of vehicle-mounted nitrogen-oxygen sensor Download PDFInfo
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- CN113803142A CN113803142A CN202010541313.3A CN202010541313A CN113803142A CN 113803142 A CN113803142 A CN 113803142A CN 202010541313 A CN202010541313 A CN 202010541313A CN 113803142 A CN113803142 A CN 113803142A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 25
- 230000000630 rising effect Effects 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 239000000523 sample Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 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
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1614—NOx amount trapped in catalyst
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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
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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)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
The invention discloses a method for acquiring key signals of a vehicle-mounted nitrogen-oxygen sensor, which adopts time event control, utilizes a cross trigger unit of a main chip of a controller to be matched with a peripheral drive circuit, improves the response speed, and accurately controls the acquisition time.
Description
Technical Field
The invention belongs to the field of sensor signal acquisition, and particularly relates to a method for acquiring key signals of a vehicle-mounted nitrogen-oxygen sensor.
Background
With the upgrading of national emission regulations, the demand for NOx emission of diesel engines is higher and higher. The nitrogen-oxygen sensor can monitor the concentration of NOx in the tail gas of the diesel engine in real time and is an indispensable key component in a diesel engine aftertreatment control system.
The nitrogen-oxygen sensor probe can normally work after being heated to a certain temperature (about 800 ℃), and the heating current is large, so that if the probe is not properly processed, the acquisition of key signals is greatly interfered.
At present, the problems of difficult avoidance of heating current, difficult grasp of acquisition time, low acquisition precision and the like generally exist in key signal acquisition of a probe of a nitrogen-oxygen sensor in a heating stage. The acquisition of the key signals of the probe of the nitrogen-oxygen sensor in the heating stage is triggered only by external voltage signals, the response is slow, delay exists, the time is not accurate, the acquisition precision is low, and the device is damaged due to the fact that the wrong working condition of the heating stage easily occurs.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for acquiring key signals of a vehicle-mounted nitrogen-oxygen sensor.
The purpose of the invention can be realized by the following technical scheme:
a method for acquiring key signals of a vehicle-mounted nitrogen-oxygen sensor comprises the following steps:
setting a counter threshold value, and generating four paths of central symmetrical PWM signals: as shown in fig. 2 and 3, WorkSignal _1 is a heating driving signal, WorkSignal _2 is an acquisition sign signal, RefSignal _1 and RefSignal _2 are virtual acquisition trigger signals, four signals are in a channel of a cross trigger unit, share a counter, the counter adopts an up/down counting mode, and generates four paths of central symmetrical PWM waveforms by matching with four different thresholds, and the working state of the four paths of central symmetrical PWM waveforms is divided into the following four stages:
a heating stage: WorkSignal _1 is at a low level, and cannot be collected at this moment, otherwise, the device is damaged;
primary collection: WorkSignal _1 is at a high level, WorkSignal _2 is at a low level, and when RefSignal _1 is changed from the low level to the high level, a rising edge triggers one-time signal acquisition;
secondary collection: WorkSignal _1 is at a high level, WorkSignal _2 is at a high level, and when RefSignal _2 is changed from a low level to a high level, a rising edge triggers one-time signal acquisition;
a rest stage: the WorkSignal _1 is at a high level, the WorkSignal _2 is at a low level, and the collected signals are processed;
a heating stage: and WorkSignal _1 is at a low level, and cannot be collected at this time, otherwise, the device is damaged.
Preferably, for the adaptive adjustment of the heating of the heater, the Duty ratio of the heating driving signal is changed, because it is convenient to share the same Counter, four different thresholds (threshhold _ 1-threshhold _4) can be changed in the same proportion, so as to realize the precise control of the acquisition time synchronization, and assuming that the maximum value of the count of the Counter is Counter _ num _ max, and the Duty ratio of the adaptive heating driving signal is Duty, then:
ThresHold_1＝Counter_num_max*Duty；
ThresHold_2＝Counter_num_max*(1–Duty)*23/36+ThresHold_1；
ThresHold_3＝Counter_num_max*(1–Duty)*24/36+ThresHold_1；
ThresHold_3＝Counter_num_max*(1–Duty)*34/36+ThresHold_1。
when the Counter counts up, the Counter _ num is greater than Threshold _ x, and a corresponding signal jumps from a low level to a high level to enter a corresponding working state; when the Counter counts down, the Counter _ num < threshhold _ x, and the corresponding signal jumps from high level to low level to enter the corresponding working state.
The invention adopts time event control, utilizes the cross trigger unit of the main chip of the controller and is matched with the peripheral drive circuit, thereby improving the response speed and accurately mastering the acquisition time control. Meanwhile, aiming at the self-adaptive adjustment of the heating of the heater, the parameters of the controller main chip cross trigger unit can be configured, and the synchronous accurate control of the acquisition time is realized.
The invention has the beneficial effects that:
according to the invention, the cross trigger unit of the main chip of the controller is utilized and matched with the peripheral driving circuit, so that the accurate control of the acquisition time can be realized, the heating stage and the level mutation time can be effectively avoided, the real-time performance and the accuracy of data acquisition are ensured, and the sensor damage caused by the error acquisition is avoided.
Drawings
FIG. 1 is a flow chart of key signal acquisition of a vehicle-mounted NOx sensor.
Fig. 2 and 3 are schematic structural diagrams of driving and signal acquisition of a nitrogen-oxygen sensor probe heater.
Detailed Description
The technical scheme of the invention is further described by combining the attached drawings:
a method for acquiring key signals of a vehicle-mounted nitrogen-oxygen sensor comprises the following steps:
setting a counter threshold value, and generating four paths of central symmetrical PWM signals: as shown in fig. 2 and 3, WorkSignal _1 is a heating driving signal, WorkSignal _2 is an acquisition sign signal, RefSignal _1 and RefSignal _2 are virtual acquisition trigger signals, four signals are in a channel of a cross trigger unit, share a counter, the counter adopts an up/down counting mode, and generates four paths of central symmetrical PWM waveforms by matching with four different thresholds, and the working state of the four paths of central symmetrical PWM waveforms is divided into the following four stages:
a heating stage: WorkSignal _1 is at a low level, and cannot be collected at this moment, otherwise, the device is damaged;
primary collection: WorkSignal _1 is at a high level, WorkSignal _2 is at a low level, and when RefSignal _1 is changed from the low level to the high level, a rising edge triggers one-time signal acquisition;
secondary collection: WorkSignal _1 is at a high level, WorkSignal _2 is at a high level, and when RefSignal _2 is changed from a low level to a high level, a rising edge triggers one-time signal acquisition;
a rest stage: the WorkSignal _1 is at a high level, the WorkSignal _2 is at a low level, and the collected signals are processed;
a heating stage: and WorkSignal _1 is at a low level, and cannot be collected at this time, otherwise, the device is damaged.
Meanwhile, aiming at the self-adaptive adjustment of the heating of the heater, the duty ratio of the heating driving signal is changed, and because the same counter is shared, four different thresholds (Threshold _1-Threshold _4) can be changed in the same proportion, and the accurate control of the synchronization of the acquisition time is realized. Assuming that the maximum count value of the Counter is Counter _ num _ max and the Duty ratio of the adaptive heating driving signal is Duty, then:
ThresHold_1＝Counter_num_max*Duty；
ThresHold_2＝Counter_num_max*(1–Duty)*23/36+ThresHold_1；
ThresHold_3＝Counter_num_max*(1–Duty)*24/36+ThresHold_1；
ThresHold_3＝Counter_num_max*(1–Duty)*34/36+ThresHold_1。
when the Counter counts up, the Counter _ num is greater than Threshold _ x, and a corresponding signal jumps from a low level to a high level to enter a corresponding working state; when the Counter counts down, the Counter _ num < threshhold _ x, and the corresponding signal jumps from high level to low level to enter the corresponding working state.
Through testing, the proportion is set to have good acquisition effect, high precision and stable working state.
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 (2)
1. A method for acquiring key signals of a vehicle-mounted nitrogen-oxygen sensor is characterized by comprising the following steps: the method comprises the following steps:
setting a counter threshold value, and generating four paths of central symmetrical PWM signals: as shown in fig. 2 and 3, WorkSignal _1 is a heating driving signal, WorkSignal _2 is an acquisition sign signal, RefSignal _1 and RefSignal _2 are virtual acquisition trigger signals, four signals are in a channel of a cross trigger unit, share a counter, the counter adopts an up/down counting mode, and generates four paths of central symmetrical PWM waveforms by matching with four different thresholds, and the working state of the four paths of central symmetrical PWM waveforms is divided into the following four stages:
a heating stage: WorkSignal _1 is at a low level, and cannot be collected at this moment, otherwise, the device is damaged;
primary collection: WorkSignal _1 is at a high level, WorkSignal _2 is at a low level, and when RefSignal _1 is changed from the low level to the high level, a rising edge triggers one-time signal acquisition;
secondary collection: WorkSignal _1 is at a high level, WorkSignal _2 is at a high level, and when RefSignal _2 is changed from a low level to a high level, a rising edge triggers one-time signal acquisition;
a rest stage: the WorkSignal _1 is at a high level, the WorkSignal _2 is at a low level, and the collected signals are processed;
a heating stage: and WorkSignal _1 is at a low level, and cannot be collected at this time, otherwise, the device is damaged.
2. The acquisition method as set forth in claim 1, wherein: aiming at the self-adaptive adjustment of the heating of the heater, the Duty ratio of the heating driving signal is changed, because the same Counter is used, four different thresholds (Threshold _1-Threshold _4) can be changed in the same proportion, and the accurate control of the synchronization of the acquisition time is realized, and if the maximum counting value of the Counter is Counter _ num _ max and the Duty ratio of the self-adaptive heating driving signal is Duty:
ThresHold_1＝Counter_num_max*Duty；
ThresHold_2＝Counter_num_max*(1–Duty)*23/36+ThresHold_1；
ThresHold_3＝Counter_num_max*(1–Duty)*24/36+ThresHold_1；
ThresHold_3＝Counter_num_max*(1–Duty)*34/36+ThresHold_1，
when the Counter counts up, the Counter _ num is greater than Threshold _ x, and a corresponding signal jumps from a low level to a high level to enter a corresponding working state; when the Counter counts down, the Counter _ num < threshhold _ x, and the corresponding signal jumps from high level to low level to enter the corresponding working state.
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| CN202010541313.3A CN113803142B (en) | 2020-06-15 | 2020-06-15 | Method for collecting key signals of vehicle-mounted nitrogen-oxygen sensor |
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| CN113803142B CN113803142B (en) | 2023-11-07 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4303978A (en) * | 1980-04-18 | 1981-12-01 | The Boeing Company | Integrated-strapdown-air-data sensor system |
| US20140260533A1 (en) * | 2013-03-15 | 2014-09-18 | Caterpillar Inc. | Diagnostic system and method for nitrogen oxide sensor |
| JP2019002842A (en) * | 2017-06-16 | 2019-01-10 | 日本特殊陶業株式会社 | Control state setting device and sensor control system |
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2020
- 2020-06-15 CN CN202010541313.3A patent/CN113803142B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4303978A (en) * | 1980-04-18 | 1981-12-01 | The Boeing Company | Integrated-strapdown-air-data sensor system |
| US20140260533A1 (en) * | 2013-03-15 | 2014-09-18 | Caterpillar Inc. | Diagnostic system and method for nitrogen oxide sensor |
| JP2019002842A (en) * | 2017-06-16 | 2019-01-10 | 日本特殊陶業株式会社 | Control state setting device and sensor control system |
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Address after: 214000 2-1205, Tian'an smart city, No. 228, Linghu Avenue, Xinwu District, Wuxi City, Jiangsu Province Patentee after: Zhuopin Intelligent Technology Wuxi Co.,Ltd. Country or region after: China Address before: 214000 2-1205, Tian'an smart city, No. 228, Linghu Avenue, Xinwu District, Wuxi City, Jiangsu Province Patentee before: ZHUO PIN INTELLIGENT TECHNOLOGY WUXI CO.,LTD. Country or region before: China |
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