CN113803142B - Method for collecting key signals of vehicle-mounted nitrogen-oxygen sensor - Google Patents
Method for collecting key signals of vehicle-mounted nitrogen-oxygen sensor Download PDFInfo
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- CN113803142B CN113803142B CN202010541313.3A CN202010541313A CN113803142B CN 113803142 B CN113803142 B CN 113803142B CN 202010541313 A CN202010541313 A CN 202010541313A CN 113803142 B CN113803142 B CN 113803142B
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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 14
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 230000000630 rising effect Effects 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 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
- 230000001960 triggered effect Effects 0.000 description 1
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
-
- 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
-
- 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 cooperate with a peripheral driving circuit, improves response speed, accurately grasps acquisition time control, and can configure parameters of the cross trigger unit of the main chip of the controller to realize accurate control of acquisition time synchronization aiming at self-adaptive adjustment of heating of a heater.
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 emissions regulations, the requirements for diesel NOx emissions are also increasing. 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 work normally only after being heated to a certain temperature (about 800 ℃), and the heating current is larger, if the processing is improper, the acquisition of key signals can be greatly interfered.
At present, the key signal acquisition in the heating stage of the nitrogen-oxygen sensor probe generally has the problems of difficult avoidance of heating current, difficult grasping of acquisition time, low acquisition precision and the like. The acquisition of the key signals of the heating stage of the nitrogen-oxygen sensor probe is triggered only by an external voltage signal, the response is slow, delay exists, the time is inaccurate, the acquisition precision is low, and the device is damaged due to the error working condition of the heating stage.
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 aim of the invention can be achieved by the following technical scheme:
a method for collecting 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, the workbench signal_1 is a heating driving signal, the workbench signal_2 is an acquisition flag signal, the refsignal_1 and the refsignal_2 are virtual acquisition trigger signals, the four signals are in channels in a cross trigger unit, and share a counter, the counter adopts an up/down counting mode and cooperates with four different thresholds to generate four paths of centrally symmetrical PWM waveforms, and the working states of the counter are divided into the following four phases:
heating: the WorkSignal_1 is low level, and cannot be collected at the moment, otherwise, the device is damaged;
and (3) primary collection: the WorkSignal_1 is high level, the WorkSignal_2 is low level, and when the RefSignal_1 changes from low level to high level, the rising edge triggers one signal acquisition;
and (3) secondary collection: the WorkSignal_1 is high, the WorkSignal_2 is high, and when the RefSignal_2 changes from low level to high level, the rising edge triggers one signal acquisition;
rest stage: the workbench signal_1 is high level, the workbench signal_2 is low level, and the acquired signals are processed;
heating: the workbench signal_1 is low, and cannot be collected at this time, otherwise the device is damaged.
Preferably, for the self-adaptive adjustment of the heating of the heater, the Duty cycle of the heating driving signal is changed, because the same Counter is convenient to be shared, four different thresholds (threshold_1-threshold_4) can be changed in the same proportion, so as to realize the accurate control of the synchronization of the acquisition time, and assuming that the maximum value of the Counter is counter_num_max and the Duty cycle of the self-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, counter_num > threshold_x, the corresponding signal jumps from low level to high level, and enters into the corresponding working state; when the Counter counts down, counter_num < threshold_x, the corresponding signal jumps from high level to low level, and enters the corresponding working state.
The invention adopts time event control, utilizes the cross trigger unit of the main chip of the controller to cooperate with the peripheral driving circuit, improves the response speed and accurately grasps the control of the acquisition time. Meanwhile, aiming at the self-adaptive adjustment of the heating of the heater, the parameters of the main chip cross trigger unit of the controller can be configured, so that the accurate control of the synchronization of the acquisition time is realized.
The invention has the beneficial effects that:
the invention utilizes the cross trigger unit of the main chip of the controller and is matched with the peripheral driving circuit, thereby realizing the accurate control of the acquisition time, effectively ensuring the avoidance of the heating stage and the level abrupt change moment, ensuring the real-time and the accuracy of data acquisition and avoiding the damage of the sensor caused by the false acquisition.
Drawings
Fig. 1 is a flowchart for collecting key signals of a vehicle-mounted nitrogen-oxygen sensor.
Fig. 2 and 3 are schematic diagrams of driving and signal acquisition structures of a nitrogen-oxygen sensor probe heater.
Detailed Description
The technical scheme of the invention is further described with reference to the accompanying drawings:
a method for collecting 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, the workbench signal_1 is a heating driving signal, the workbench signal_2 is an acquisition flag signal, the refsignal_1 and the refsignal_2 are virtual acquisition trigger signals, the four signals are in channels in a cross trigger unit, and share a counter, the counter adopts an up/down counting mode and cooperates with four different thresholds to generate four paths of centrally symmetrical PWM waveforms, and the working states of the counter are divided into the following four phases:
heating: the WorkSignal_1 is low level, and cannot be collected at the moment, otherwise, the device is damaged;
and (3) primary collection: the WorkSignal_1 is high level, the WorkSignal_2 is low level, and when the RefSignal_1 changes from low level to high level, the rising edge triggers one signal acquisition;
and (3) secondary collection: the WorkSignal_1 is high, the WorkSignal_2 is high, and when the RefSignal_2 changes from low level to high level, the rising edge triggers one signal acquisition;
rest stage: the workbench signal_1 is high level, the workbench signal_2 is low level, and the acquired signals are processed;
heating: the workbench signal_1 is low, 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 a heating driving signal is changed, and four different thresholds (threshold_1-threshold_4) can be changed in the same proportion because of the convenience of sharing the same counter, so that 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, counter_num > threshold_x, the corresponding signal jumps from low level to high level, and enters into the corresponding working state; when the Counter counts down, counter_num < threshold_x, the corresponding signal jumps from high level to low level, and enters the corresponding working state.
Through the test, the proportion is set to be good in collection effect, high in precision and stable in working state.
Finally, it should be noted that:
the method may be practiced with reference to the present disclosure by those skilled in the art, and it is specifically pointed out that all similar alterations and modifications are apparent to those skilled in the art, and are considered to be included in the present invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those skilled in the relevant art that various modifications and variations can be made in the methods and applications described herein, and in the practice and application of the techniques of this invention, without departing from the spirit or scope of the invention.
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: 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 spirit and scope of the invention.
Claims (1)
1. A method for collecting key signals of a vehicle-mounted nitrogen-oxygen sensor is characterized by comprising the following steps of: the method comprises the following steps:
setting a counter threshold value, and generating four paths of centrally symmetrical PWM signals: the work signal_1 is a heating driving signal, the work signal_2 is an acquisition mark signal, the refsignal_1 and the refsignal_2 are virtual acquisition trigger signals, the four signals are in channels in one cross trigger unit, and share one counter, the counter adopts an up/down counting mode and is matched with four different thresholds to generate four paths of centrally symmetrical PWM waveforms, and the working states of the counter are divided into the following four stages:
heating: the WorkSignal_1 is low level, and cannot be collected at the moment, otherwise, the device is damaged;
and (3) primary collection: the WorkSignal_1 is high level, the WorkSignal_2 is low level, and when the RefSignal_1 changes from low level to high level, the rising edge triggers one signal acquisition;
and (3) secondary collection: the WorkSignal_1 is high, the WorkSignal_2 is high, and when the RefSignal_2 changes from low level to high level, the rising edge triggers one signal acquisition;
rest stage: the workbench signal_1 is high level, the workbench signal_2 is low level, and the acquired signals are processed;
heating: the WorkSignal_1 is low level, and cannot be collected at the moment, otherwise, the device is damaged;
for 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 convenient to be shared, four different thresholds (threshold_1-threshold_4) can be changed in the same proportion, so that the accurate control of the synchronization of the acquisition time is realized, and assuming that the maximum counting value of the Counter is counter_num_max and the Duty ratio of the self-adaptive heating driving signal is Duty, the following steps are performed:
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_4＝Counter_num_max*(1–Duty)*34/36+
ThresHold_1，
when the Counter counts up, counter_num > threshold_x, the corresponding signal jumps from low level to high level, and enters into the corresponding working state; when the Counter counts downwards, counter_num < threshold_x, and the corresponding signal jumps from high level to low level and enters a corresponding working state;
wherein, thresHold_1 controls the generation of a heating driving signal WorkSignal_1, thresHold_2 controls the generation of an acquisition triggering signal RefSingnal_1,
ThresHold 3 controls the generation of the acquisition flag signal WorkSignal 2,
ThresHold_4 controls the generation of the acquisition trigger signal RefSingnal_2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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|---|---|---|---|
| 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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| CN113803142A CN113803142A (en) | 2021-12-17 |
| CN113803142B true CN113803142B (en) | 2023-11-07 |
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Citations (2)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9261481B2 (en) * | 2013-03-15 | 2016-02-16 | Caterpillar Inc. | Diagnostic system and method for nitrogen oxide sensor |
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2020
- 2020-06-15 CN CN202010541313.3A patent/CN113803142B/en active Active
Patent Citations (2)
| 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 |
| 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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