CN110714813A - Diesel vehicle particle sensor detection method and device - Google Patents
Diesel vehicle particle sensor detection method and device Download PDFInfo
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- CN110714813A CN110714813A CN201910962370.6A CN201910962370A CN110714813A CN 110714813 A CN110714813 A CN 110714813A CN 201910962370 A CN201910962370 A CN 201910962370A CN 110714813 A CN110714813 A CN 110714813A
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
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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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- 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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Abstract
The invention provides a method and a device for detecting a diesel vehicle particle sensor, wherein the method comprises the following steps: the method comprises the steps that a PM sensor to be detected is connected in a communication mode, the communication function of the PM sensor is detected, and a communication detection result indicating whether the communication with the PM sensor is normal or not is generated; under the condition that the communication detection result shows that the communication of the PM sensor is normal, sending a working command to trigger the PM sensor to enter a regeneration execution process; and in the regeneration execution process of the PM sensor, receiving the message information of the PM sensor and detecting the message information to generate a regeneration process detection result which indicates whether the regeneration process of the PM sensor is normal or not. The invention realizes the fault detection of the PM sensor by acquiring and analyzing the message information of the PM sensor in the regeneration process. The invention obviously improves the detection efficiency of the PM sensor and reduces the detection cost.
Description
Technical Field
The invention relates to the field of engine testing, in particular to a method and a device for detecting a particulate matter sensor of a diesel vehicle.
Background
Many hardware upgrades occur for diesel vehicles in the sixth phase of the country compared to the fifth phase of the country. The diesel vehicle particulate Matter sensor is a new sensor added in six countries, and is hereinafter referred to as a PM (particulate Matter sensor) sensor.
The PM sensor operating principle is summarized as follows: the measurement output of the PM sensor is a current value, the magnitude of the current value is in direct proportion to the number of particles gathered on a sensor probe, when the current is about 0uA, the probe is clean and has no particles, and when the current reaches an upper limit value (such as 127uA), the full load of the particles is indicated. As time increases, more carbon particles accumulate on the sensor probe, with a consequent increase in current. When the particulate matters in the tail gas are less, the increasing speed of the current value output by the sensor is slower; on the contrary, when the particulate matters in the exhaust gas are more, the increase speed of the current value output by the sensor is higher. Therefore, the particulate matter concentration in the exhaust gas can be obtained by calculating the rate of increase of the current value output from the sensor.
Because the PM sensor is a brand-new sensor for detecting the emission of the diesel vehicle, the market has less cognition on the PM sensor, and once the measurement fails, maintenance personnel cannot rapidly judge whether the PM sensor is damaged or faults occur in other links such as a signal transmission link, a control system and the like. In the prior art, the general practice is to detach the PM sensor to be detected and send the sensor to the manufacturer to complete the detection, or to detect and judge the PM sensor on site by means of a heavy detection platform or by adopting more steps, which often causes the following problems: for example, detection efficiency is low, costs such as time and expense are high, user experience is poor, and the like.
Disclosure of Invention
The invention provides a method for detecting a diesel vehicle particle sensor on one hand, and the detailed technical scheme is as follows:
a diesel vehicle PM sensor detection method comprises the following steps:
the method comprises the steps that a PM sensor to be detected is connected in a communication mode, the communication function of the PM sensor is detected, and a communication detection result indicating whether the communication with the PM sensor is normal or not is generated;
under the condition that the communication detection result shows that the communication of the PM sensor is normal, sending a working command to trigger the PM sensor to enter a regeneration execution process;
and in the regeneration execution process of the PM sensor, receiving the message information of the PM sensor and detecting the message information to generate a regeneration process detection result which indicates whether the regeneration process of the PM sensor is normal or not.
In some embodiments, the detection is stopped in case the communication detection result indicates that the PM sensor communication cannot communicate normally.
In some embodiments, the PM sensor regeneration execution process sequentially includes a regeneration waiting link, a regeneration link, and a regeneration ending link, and the detecting the message information sequentially includes:
detecting the message sending function of a PM sensor in a waiting regeneration link, and detecting the physical parameters in the message under the condition that the message sending function is normal so as to generate a detection result of the waiting regeneration link whether the PM sensor is normal in the waiting regeneration link or not;
detecting the message sending function of the PM sensor in the regeneration link under the condition that the detection result of the regeneration waiting link shows that the PM sensor is normal in the regeneration waiting link, and detecting the physical parameters in the message under the condition that the message sending function is normal to generate the regeneration link detection result of whether the PM sensor is normal in the regeneration link or not;
and detecting the message sending function of the PM sensor in the regeneration ending link under the condition that the detection result of the regeneration link shows that the PM sensor is normal in the regeneration link, and detecting the physical parameters in the message under the condition that the message sending function is normal to generate the detection result of the regeneration ending link whether the PM sensor is normal in the regeneration ending link or not.
In some embodiments, in the event that the waiting for regeneration link detection result indicates that the PM sensor is not normal waiting for the regeneration link, stopping the detection; and stopping detection under the condition that the detection result of the regeneration link shows that the PM sensor is abnormal in the regeneration link.
In some embodiments, the physical parameters include at least current and temperature on the PM sensor probe.
In some embodiments, the detecting the physical parameter in the message includes at least: and detecting whether the temperature gradually rises, wherein if yes, the detection result of the regeneration link shows that the PM sensor is normal in the regeneration link, and if not, the detection result of the regeneration link shows that the PM sensor is abnormal in the regeneration link.
In some embodiments, the detecting the physical parameter in the message includes at least: and detecting whether the current is smaller than a preset threshold value, if so, displaying that the PM sensor is normal in a regeneration ending link according to the detection result of the ending link, and if not, displaying that the PM sensor is abnormal in the regeneration ending link according to the detection result of the ending link.
Another aspect of the present invention provides a PM sensor detection device, which has the following detailed technical solution:
a detection device for a PM sensor of a diesel vehicle comprises a single chip microcomputer and a CAN communication chip connected with the single chip microcomputer, wherein the single chip microcomputer is in signal connection with the PM sensor to be detected through the CAN communication chip;
the single chip microcomputer detects the communication function of the PM sensor and generates a communication detection result whether the communication with the PM sensor is normal or not;
under the condition that the communication detection result shows that the PM sensor is normally communicated, the singlechip sends a working command to trigger the PM sensor to enter a regeneration execution process;
in the PM sensor regeneration execution process, the single chip microcomputer receives the message information of the PM sensor and detects the message information to generate a regeneration process detection result which indicates whether the PM sensor regeneration process is normal or not.
In some embodiments, the system further comprises a control display panel connected to the single chip microcomputer, wherein the control display panel is used for displaying message information of the PM sensor, a communication detection result generated by the single chip microcomputer, and a regeneration process detection result.
The invention provides a method and a device for detecting a PM sensor of a diesel vehicle, which realize fault detection of the PM sensor by acquiring and analyzing message information of the PM sensor in a regeneration process. The invention obviously improves the detection efficiency of the PM sensor and reduces the detection cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings which are needed in the embodiments and are practical will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. Wherein the content of the first and second substances,
FIG. 1 is a schematic diagram illustrating a detection flow of a method for detecting a PM sensor of a diesel vehicle according to an aspect of the present invention;
FIG. 2 is a schematic detection flow diagram of the regeneration detection process of FIG. 1 in some embodiments;
fig. 3 is a schematic structural diagram of a diesel vehicle PM sensor detection device according to another aspect of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
A CAN communication module is integrated in the PM sensor, and in the tail gas detection process, the PM sensor is communicated with a tail gas detection system through a CAN bus. And after receiving a working order of the tail gas detection system, starting a measurement process by the PM sensor. Prior to formal measurement, the PM sensor will automatically perform a regeneration process, i.e., heat the sensor probe to remove carbon particles from the probe (equivalent to zeroing). After the regeneration process is finished, the PM sensor enters a formal measurement process. The regeneration process comprises three links of 'waiting for regeneration', 'regeneration' and 'regeneration end', which are divided from the execution program. In the regeneration process, in each execution link, the PM sensor sends a message to the tail gas detection system through the CAN communication module, and the tail gas detection system obtains the real-time working condition of the PM sensor by reading the message. The message includes the current execution link of the PM sensor and the current physical parameters such as current, probe temperature, power supply voltage, heating power and the like.
It can be concluded that when the exhaust gas detection system is plugged into the PM sensor, if one or more of the following three conditions exist: 1. communication with the PM sensor cannot be achieved; 2. after the work order is sent, the message information of a certain execution link in the regeneration process cannot be normally acquired; 3. if one or more physical parameters in the physical parameters included in the message information of a certain execution link exceed a predetermined threshold value, it can be determined that the PM sensor is damaged.
Based on the above judgment, the invention provides a detection method of a diesel vehicle PM sensor, which judges whether the PM sensor is damaged or not by analyzing message information of the PM sensor in a regeneration process.
As shown in fig. 1 to 2, a method 100 for detecting a PM sensor of a diesel vehicle according to an aspect of the present invention includes the steps of:
and S110, the PM sensor to be detected is connected in a communication mode, the communication function of the PM sensor is detected, and a communication detection result of whether the communication with the PM sensor is normal or not is generated.
Generally, the PM sensor communicates by using the CAN bus, so that the PM sensor CAN be connected to the CAN bus and send a message (such as a handshake message), and if a response message returned by the PM sensor CAN be received, whether the PM sensor communication function is normal or not CAN be judged. As an example, if any response information from the PM sensor is not received within a predetermined time after the information is transmitted, it may be judged that the communication function of the PM sensor is not normal; if the response information from the PM sensor can be received within a predetermined time, it can be judged that the communication function of the PM sensor is normal. Of course, any other suitable technique may also be used to detect whether the PM sensor communication function is normal.
When the communication detection result shows that the PM sensor communication is abnormal, the detection is stopped. And directly outputting a communication detection result. Otherwise, the process proceeds to step S120.
And S120, sending a work order to trigger the PM sensor to enter a regeneration execution process under the condition that the communication detection result shows that the PM sensor is normally communicated.
And S130, receiving the message information of the PM sensor and detecting the message information in the regeneration execution process of the PM sensor so as to generate a regeneration process detection result which indicates whether the regeneration process of the PM sensor is normal or not.
The PM sensor regeneration execution process sequentially includes a regeneration waiting link, a regeneration link and a regeneration ending link, and the step S130 sequentially includes the following substeps:
s131: the method comprises the steps of detecting the message sending function of a PM sensor in a waiting regeneration link, and detecting the physical parameters in the message under the condition that the message sending function is normal so as to generate a detection result of the waiting regeneration link whether the PM sensor is normal in the waiting regeneration link.
When a PM sensor enters a regeneration waiting link, the PM sensor generates a regeneration waiting link message, and the regeneration waiting link message comprises two parts: a message identifier showing that the PM sensor is "waiting for regeneration", and real-time physical parameters of the PM sensor, such as current, temperature, etc. information on the PM sensor probe.
In this stage, through the communication connection established with the PM sensor, if a message of the waiting regeneration link can be acquired and the message identifier indicates that the state of the PM sensor is "waiting for regeneration", it indicates that the message sending function of the PM sensor in the waiting regeneration link is normal. At this time, the physical parameters in the message are detected, and if each physical parameter is within the predetermined threshold range, it indicates that the PM sensor is normal in the link waiting for regeneration, and the process proceeds to step S132.
Otherwise, stopping detection and directly outputting the detection result of the waiting regeneration link under the condition that the message sending function of the PM sensor in the waiting regeneration link is abnormal or the detection result of the waiting regeneration link shows that the PM sensor is abnormal in the waiting regeneration link.
S132: and detecting the message sending function of the PM sensor in the regeneration link under the condition that the detection result of the regeneration waiting link shows that the PM sensor is normal in the regeneration waiting link, and detecting the physical parameters in the message under the condition that the message sending function is normal to generate the regeneration link detection result of whether the PM sensor is normal in the regeneration link.
In this stage, through the communication connection established with the PM sensor, if a regeneration link message can be acquired and the message identifier indicates that the state of the PM sensor is "regeneration", it indicates that the message sending function of the PM sensor in the regeneration link is normal. At this time, the physical parameters in the message are detected, and if each physical parameter is within the predetermined threshold range, it indicates that the PM sensor is normal in the regeneration link, and the process proceeds to step S133.
As is well known to those skilled in the art, the regeneration step is to heat the probe of the PM sensor to burn off the soot on the probe. Therefore, during the regeneration phase, the temperature at the PM sensor should be characterized as a gradual rise. For the above reasons, in some embodiments, the step S132 of detecting the physical parameter in the message at least includes: and detecting whether the temperature gradually rises or not, and if so, displaying that the PM sensor is normal in the regeneration link according to the detection result of the regeneration link. If not, the detection result of the regeneration link shows that the PM sensor is abnormal in the regeneration link.
And stopping detection and directly outputting the detection result of the regeneration link under the condition that the message sending function of the PM sensor in the regeneration link is abnormal or the detection result of the regeneration link shows that the PM sensor is abnormal in the regeneration link.
S133: and detecting the message sending function of the PM sensor in the regeneration ending link under the condition that the detection result of the regeneration link shows that the PM sensor is normal in the regeneration link, and detecting the physical parameters in the message under the condition that the message sending function is normal to generate the detection result of the regeneration ending link whether the PM sensor is normal in the regeneration ending link or not.
In this stage, through the communication connection established with the PM sensor, if a message of a regeneration end link can be acquired and the message identifier indicates that the state of the PM sensor is "regeneration end", it indicates that the message sending function of the PM sensor in the regeneration end link is normal. At this time, the physical parameters in the message are detected, and if all the physical parameters are within a preset threshold range, the PM sensor is indicated to be normal in a regeneration ending link, and the detection is ended.
As is well known to those skilled in the art, during the end of regeneration, the soot on the PM sensor probe is burned out, and the current on the PM sensor should be below a predetermined lower limit, such as 0.01uA in some embodiments. For the above reasons, in step S133, the detecting the physical parameter in the message at least includes: and detecting whether the current is less than the lower limit value of 0.01uA, if so, displaying that the PM sensor is normal in a regeneration ending link according to the ending link detection result, and outputting the detection result of the regeneration ending link. And if the PM sensor is not in the regeneration ending link, the detection result of the ending link shows that the PM sensor is abnormal in the regeneration ending link.
And stopping detection and outputting the detection result of the regeneration ending link under the condition that the message sending function of the PM sensor in the regeneration ending link is abnormal or the detection result of the regeneration ending link shows that the PM sensor is abnormal in the regeneration ending link.
In order to realize the detection method of the diesel vehicle PM sensor of the invention, the invention provides a diesel vehicle PM sensor detection device in another aspect. As shown in fig. 3, the diesel vehicle PM sensor detection device 200 provided by the present invention includes a single chip 201 and a CAN communication chip 202 connected to the single chip 201, wherein the single chip 201 is in signal connection with a PM sensor 300 to be detected through the CAN communication chip 202. Specifically, the method comprises the following steps: the one-chip microcomputer 201 is configured to detect a communication function of the PM sensor 300 and generate a communication detection result as to whether the communication function with the PM sensor 300 is normal. In the case where the communication detection result shows that the communication function of the PM sensor 300 is normal, the one-chip microcomputer 201 sends an operation command to trigger the PM sensor 300 to enter the regeneration execution process. During the regeneration execution process of the PM sensor 300, the single chip microcomputer 201 receives the message information generated by the PM sensor 300 and detects the message information to generate a regeneration process detection result indicating whether the regeneration process of the PM sensor 300 is normal or not.
Since the technical principle of the diesel vehicle PM sensor detection apparatus 200 is consistent with that of the PM sensor detection method 100, a simplified or omitted process is performed on the overlapping portions when describing the diesel vehicle PM sensor detection apparatus 200, and the simplified or omitted portions can be referred to the related description of the PM sensor detection method 100.
In some embodiments, the single chip microcomputer 201 adopts a single chip microcomputer chip with the model number of STM32-F103C8T6, and the CAN communication chip 202 adopts a CAN communication chip with the model number of Tja 1050.
Preferably, in some embodiments, the diesel vehicle PM sensor detection apparatus 200 further includes a control display panel 203 connected to the single chip microcomputer 201, where the control display panel 203 is configured to display message information generated by the PM sensor 300, communication detection results generated by the single chip microcomputer 201, regeneration process detection results, and the like.
Through the description of the above embodiments, it can be seen that the method and the device for detecting the PM sensor of the diesel vehicle provided by the invention can be used for detecting the fault of the PM sensor by acquiring and analyzing the message information of the PM sensor in the regeneration process. The invention obviously improves the detection efficiency of the PM sensor and reduces the detection cost.
The invention has been described above with a certain degree of particularity. It will be understood by those of ordinary skill in the art that the description of the embodiments is merely exemplary and that all changes that come within the true spirit and scope of the invention are desired to be protected. The scope of the invention is defined by the appended claims rather than by the foregoing description of the embodiments.
Claims (9)
1. A detection method of a diesel vehicle PM sensor is characterized by comprising the following steps:
the method comprises the steps that a PM sensor to be detected is connected in a communication mode, the communication function of the PM sensor is detected, and a communication detection result indicating whether the communication with the PM sensor is normal or not is generated;
under the condition that the communication detection result shows that the communication of the PM sensor is normal, sending a working command to trigger the PM sensor to enter a regeneration execution process;
and in the regeneration execution process of the PM sensor, receiving the message information of the PM sensor and detecting the message information to generate a regeneration process detection result which indicates whether the regeneration process of the PM sensor is normal or not.
2. The method according to claim 1, wherein the detection is stopped when the communication detection result indicates that the PM sensor communication cannot be normally communicated.
3. The method according to claim 1, wherein the PM sensor regeneration execution process sequentially includes a regeneration waiting step, a regeneration step, and a regeneration ending step, and the detecting the message information sequentially includes:
detecting the message sending function of a PM sensor in a waiting regeneration link, and detecting the physical parameters in the message under the condition that the message sending function is normal so as to generate a detection result of the waiting regeneration link whether the PM sensor is normal in the waiting regeneration link or not;
detecting the message sending function of the PM sensor in the regeneration link under the condition that the detection result of the regeneration waiting link shows that the PM sensor is normal in the regeneration waiting link, and detecting the physical parameters in the message under the condition that the message sending function is normal to generate the regeneration link detection result of whether the PM sensor is normal in the regeneration link or not;
and detecting the message sending function of the PM sensor in the regeneration ending link under the condition that the detection result of the regeneration link shows that the PM sensor is normal in the regeneration link, and detecting the physical parameters in the message under the condition that the message sending function is normal to generate the detection result of the regeneration ending link whether the PM sensor is normal in the regeneration ending link or not.
4. The detection method of the PM sensor according to claim 3, characterized in that:
stopping detection under the condition that the detection result of the regeneration waiting link shows that the PM sensor is abnormal in the regeneration waiting link;
and stopping detection under the condition that the detection result of the regeneration link shows that the PM sensor is abnormal in the regeneration link.
5. The method of claim 1, wherein the physical parameters include at least current and temperature on the PM sensor probe.
6. The method according to claim 5, wherein the detecting the physical parameter in the message in the regeneration step at least comprises: and detecting whether the temperature gradually rises, wherein if yes, the detection result of the regeneration link shows that the PM sensor is normal in the regeneration link, and if not, the detection result of the regeneration link shows that the PM sensor is abnormal in the regeneration link.
7. The method according to claim 5, wherein the detecting the physical parameter in the message at least comprises: and detecting whether the current is smaller than a preset threshold value, if so, displaying that the PM sensor is normal in a regeneration ending link according to the detection result of the ending link, and if not, displaying that the PM sensor is abnormal in the regeneration ending link according to the detection result of the ending link.
8. The detection device of the diesel vehicle PM sensor is characterized by comprising a single chip microcomputer and a CAN communication chip connected with the single chip microcomputer, wherein the single chip microcomputer is in signal connection with the PM sensor to be detected through the CAN communication chip;
the single chip microcomputer detects the communication function of the PM sensor and generates a communication detection result whether the communication with the PM sensor is normal or not;
under the condition that the communication detection result shows that the PM sensor is normally communicated, the singlechip sends a working command to trigger the PM sensor to enter a regeneration execution process;
in the PM sensor regeneration execution process, the single chip microcomputer receives the message information of the PM sensor and detects the message information to generate a regeneration process detection result which indicates whether the PM sensor regeneration process is normal or not.
9. The apparatus according to claim 8, further comprising a control display panel connected to the single chip, wherein the control display panel is configured to display message information of the PM sensor, a communication detection result generated by the single chip, and a regeneration process detection result.
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