CN111396180A - Conversion efficiency abnormity judgment method and device - Google Patents
Conversion efficiency abnormity judgment method and device Download PDFInfo
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- CN111396180A CN111396180A CN202010246463.1A CN202010246463A CN111396180A CN 111396180 A CN111396180 A CN 111396180A CN 202010246463 A CN202010246463 A CN 202010246463A CN 111396180 A CN111396180 A CN 111396180A
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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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
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
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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
- F01N2900/1621—Catalyst conversion efficiency
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a method and a device for judging the abnormity of conversion efficiency. Wherein, the method comprises the following steps: monitoring an original engine emission concentration value of an oxynitride emitted by an engine of a target vehicle; determining whether the engine has original emission deterioration according to the original emission concentration value; if not, judging whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal or not to obtain a judgment result; and outputting the judgment result. The invention solves the technical problems of lower judging efficiency and lower accuracy of the judging result when the effectiveness of the conversion efficiency of the SCR box is judged in the prior art.
Description
Technical Field
The invention relates to the field of vehicle fault detection, in particular to a conversion efficiency abnormity judgment method and device.
Background
When the fault code that the emission of the market vehicle is reported by mistake and exceeds the standard is adopted, the difficulty of vehicle investigation is high in the service station, after urea, diesel oil, a urea nozzle, a nitrogen-oxygen sensor and the like are examined, a key selective catalytic reduction SCR box needs to be detected, after possible reasons such as obvious internal blockage, backward movement of a carrier and the like are generally removed, the effectiveness of the conversion efficiency of the SCR box needs to be judged finally, so that whether the SCR box is judged to be good or not is determined, and whether the SCR box is replaced or not is determined.
However, in the prior art, when the effectiveness of the conversion efficiency of the SCR box is judged, maintenance personnel usually perform troubleshooting, often guess fault points according to experience and sequentially eliminate the fault points, so that the reason causing the emission to exceed the standard cannot be effectively judged, and the judgment result cannot be supported by data; namely, the technical problem of low judgment efficiency and accuracy exists when the effectiveness of the conversion efficiency of the SCR box is judged in the prior art.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a conversion efficiency abnormity judgment method and device, and aims to at least solve the technical problems of low judgment efficiency and low accuracy of judgment results when the effectiveness of the conversion efficiency of an SCR box is judged in the prior art.
According to an aspect of the embodiments of the present invention, there is provided a method for determining an abnormality of conversion efficiency, including: monitoring an original engine emission concentration value of an oxynitride emitted by an engine of a target vehicle; determining whether the engine has original emission deterioration according to the original emission concentration value; if not, judging whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal or not to obtain a judgment result; and outputting the judgment result.
Optionally, determining whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal includes: acquiring an actual conversion efficiency value and a conversion efficiency limit value of the selective catalytic reduction box; comparing the actual conversion efficiency value with the conversion efficiency limit value to obtain a comparison result; and judging whether the conversion efficiency of the selective catalytic reduction box is abnormal or not based on the comparison result.
Optionally, judging whether the conversion efficiency of the selective catalytic reduction box is abnormal based on the comparison result includes: and if all comparison results in a set of judgment tests indicate that the actual conversion efficiency value is lower than the conversion efficiency limit value, determining that the conversion efficiency of the selective catalytic reduction box is abnormal, wherein the set of judgment tests comprises at least one judgment process.
Optionally, judging whether the conversion efficiency of the selective catalytic reduction box is abnormal based on the comparison result includes: if at least one comparison result in a set of judgment tests indicates that the actual conversion efficiency value is higher than the conversion efficiency limit value, executing a set of judgment tests again; calculating whether the number of times that the comparison result in two consecutive groups of judgment tests indicates that the actual conversion efficiency value is higher than the conversion efficiency limit value is smaller than a preset number, wherein the preset number is the group capacity of one group of judgment tests;
and if the calculation result indicates that the times are less than the preset number, determining that the conversion efficiency of the selective catalytic reduction box is abnormal, otherwise, determining that the conversion efficiency of the selective catalytic reduction box is normal.
Optionally, determining whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal includes: detecting the upstream nitrogen oxide content and the downstream nitrogen oxide content of the engine when the engine entering an emission monitoring area is monitored; comparing whether the content of the upstream oxynitride is equal to or greater than a first content threshold value and whether the content of the downstream oxynitride is equal to or greater than a second content threshold value to obtain a comparison result; and if the upstream nitrogen oxide content is equal to or greater than the first content threshold value and the downstream nitrogen oxide content is equal to or greater than the second content threshold value, determining that the conversion efficiency of the selective catalytic reduction box is abnormal.
Optionally, after outputting the determination result, the method further includes: determining prompt information corresponding to the judgment result; and displaying the judgment result and the prompt information in a display interface.
According to another aspect of the embodiments of the present invention, there is also provided a conversion efficiency abnormality determination apparatus, including: the monitoring module is used for monitoring the original engine emission concentration value of the oxynitride emitted by the engine of the target vehicle; the determining module is used for determining whether the engine has original engine emission deterioration according to the original engine emission concentration value; the judging module is used for judging whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal or not if the conversion efficiency of the selective catalytic reduction box in the target vehicle is not abnormal, and obtaining a judging result; and the output module is used for outputting the judgment result.
Optionally, the judging module includes: the first acquisition unit is used for acquiring the actual conversion efficiency value and the conversion efficiency limit value of the selective catalytic reduction box; the first comparison unit is used for comparing the actual conversion efficiency value with the conversion efficiency limit value to obtain a comparison result; and the first judgment unit is used for judging whether the conversion efficiency of the selective catalytic reduction box is abnormal or not based on the comparison result.
Optionally, the first determining unit includes: a first judging subunit, configured to determine that the conversion efficiency of the selective catalytic reduction box is abnormal if all comparison results in a set of judgment tests indicate that the actual conversion efficiency value is lower than the conversion efficiency limit value, where the set of judgment tests includes at least one judgment process.
Optionally, the first determining unit further includes: an execution unit, configured to execute the set of judgment tests again if at least one comparison result in the set of judgment tests indicates that the actual conversion efficiency value is higher than the conversion efficiency limit; a calculating unit, configured to calculate whether a number of times that the comparison result in two consecutive sets of the determination tests indicates that the actual conversion efficiency value is higher than the conversion efficiency limit value is smaller than a predetermined number, where the predetermined number is a set capacity of one set of the determination tests; and the second judgment subunit is used for determining that the conversion efficiency of the selective catalytic reduction box is abnormal if the calculation result indicates that the times are smaller than the preset number, and otherwise determining that the conversion efficiency of the selective catalytic reduction box is normal.
According to another aspect of the embodiments of the present invention, there is also provided a non-volatile storage medium, where the non-volatile storage medium includes a stored program, and when the program runs, a device in which the non-volatile storage medium is located is controlled to execute any one of the above abnormality determination methods for conversion efficiency.
According to another aspect of the embodiments of the present invention, there is also provided a processor, configured to run a program stored in a memory, where the program is run to perform any one of the above-mentioned conversion efficiency abnormality determination methods.
In the embodiment of the invention, the concentration value of the original engine emission of the oxynitride emitted by the engine of the target vehicle is monitored; determining whether the engine has original emission deterioration according to the original emission concentration value; if not, judging whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal or not to obtain a judgment result; the judgment result is output, and the purpose of quickly and efficiently judging whether the conversion efficiency of the SCR box is abnormal is achieved, so that the technical effects of improving the judgment efficiency and the accuracy of the judgment result when the validity of the conversion efficiency of the SCR box is judged are achieved, and the technical problems that the judgment efficiency is low and the accuracy of the judgment result is low when the validity of the conversion efficiency of the SCR box is judged in the prior art are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flowchart of a conversion efficiency abnormality determination method according to an embodiment of the present invention;
FIG. 2 is a flow chart of an alternative conversion efficiency anomaly determination method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an abnormality determination device for conversion efficiency according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terms "second" and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
First, in order to facilitate understanding of the embodiments of the present invention, some terms or nouns referred to in the present invention will be explained as follows:
SCR: selective Catalytic Reduction, i.e. Selective Catalytic Reduction.
Primary NOx concentration value: i.e. the concentration value of the nox emitted by the engine as such.
And (3) marking and carrying the vehicle: i.e. a vehicle carrying a standard load.
Exhaust gas flow rate: i.e. the volume of exhaust gas discharged by the engine per unit of time.
A nitrogen-oxygen sensor: i.e. a sensor that detects the nitrogen oxygen concentration of the exhaust gases in the exhaust pipe of the engine.
Upstream nitrogen oxygen sensor: i.e. a nitrogen oxygen sensor located at the front end of the SCR tank.
Downstream nitrogen oxygen sensor: i.e., a nitrogen-oxygen sensor located at the end of the SCR tank.
Conversion efficiency of the SCR tank: i.e., the efficiency of the SCR tank in treating nitrogen oxides.
Conversion efficiency of actual SCR tank: i.e. the actual conversion efficiency of the aftertreatment to nox monitored by the controller ECU.
Conversion efficiency limit of SCR tank: i.e. the nitrogen oxide conversion efficiency limit for the post-treatment calibrated in the controller ECU.
Example 1
It should be noted that, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in an order different from that shown or described herein.
Fig. 1 is a flowchart of a conversion efficiency abnormality determination method according to an embodiment of the present invention, and as shown in fig. 1, the method includes the steps of:
step S102, monitoring an original engine emission concentration value of oxynitride emitted by an engine of a target vehicle;
step S104, determining whether the engine has original engine emission deterioration according to the original engine emission concentration value;
step S106, if not, judging whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal or not to obtain a judgment result;
and step S108, outputting the judgment result.
In the embodiment of the invention, the concentration value of the original engine emission of the oxynitride emitted by the engine of the target vehicle is monitored; determining whether the engine has original emission deterioration according to the original emission concentration value; if not, judging whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal or not to obtain a judgment result; the judgment result is output, and the purpose of quickly and efficiently judging whether the conversion efficiency of the SCR box is abnormal is achieved, so that the technical effects of improving the judgment efficiency and the accuracy of the judgment result when the validity of the conversion efficiency of the SCR box is judged are achieved, and the technical problems that the judgment efficiency is low and the accuracy of the judgment result is low when the validity of the conversion efficiency of the SCR box is judged in the prior art are solved.
As an alternative embodiment, before performing step S102 and monitoring the original engine emission concentration value of the nox emitted by the engine of the target vehicle, the method further includes: and (4) executing test preparation work, namely detecting whether equipment such as diagnostic equipment, a standard vehicle and a notebook computer is abnormal in advance, replacing urea of a regular brand, testing a downstream nitrogen oxygen sensor and confirming that the test environment is not abnormal.
In the embodiment of the application, the original engine emission concentration value of the oxynitride emitted by the engine of the target vehicle is monitored, namely the original exhaust NOx concentration value of the engine is monitored, and whether the engine has original engine emission deterioration or not is determined according to the original engine emission concentration value.
As an alternative embodiment, but not limited to, by connecting the notebook computer with the target vehicle (i.e. the test vehicle), the target vehicle starts to operate under the standard load state, and the target vehicle is controlled to operate stably at a certain value between 50-80km/h as much as possible, and the exhaust temperature of the target vehicle is controlled to be above 250.
And (4) entering an emission standard exceeding function diagnosis module in a diagnosis software interface, clicking to start monitoring, and finishing the heating of the nitrogen-oxygen sensor dew point protection after about 10 minutes. And the diagnostic software automatically calibrates, temporarily sets the urea injection to be 0, avoids the interference of urea on the original exhaust monitoring of the engine, and then starts to read the NOx concentration value of the original exhaust of the engine calculated by the ECU and the real nitrogen oxide concentration value measured by the downstream nitrogen oxide sensor. And continuously sampling for 10 minutes, and then respectively accumulating collected values according to the exhaust gas flow rate pair to obtain a theoretical original value sum A and a downstream nitrogen-oxygen sensor actual value sum B, wherein if (B-A)/A is 100 percent, the sum is C.
As an alternative embodiment, if C is in the range of +/-20%, determining that the original exhaust NOx concentration value of the engine is not abnormal and the original exhaust emission is not deteriorated; if C is less than-20%, the value of the original NOx concentration of the engine is roughly judged to be small, and default emission is good and is not checked possibly according to the relation of environmental factors such as local humidity and the like.
As another alternative example, if the C is more than 20 percent, the concentration of the NOx in the original exhaust of the engine is determined to be high, the deterioration of the original engine emission exists, the test of the diagnostic software is finished, and the interface of the diagnostic software displays that: after the test is finished, the original exhaust of the engine is deteriorated, and parts and media related to combustion, such as an oil injector, a gap between an intake valve and an exhaust valve, an intake pipeline, diesel oil and the like, need to be checked.
In an alternative embodiment, after determining that the original engine emission deterioration does not exist, namely after the original emission test is finished and no abnormality exists, the diagnostic software continues to monitor the target vehicle, the target vehicle continues to stably run at a certain value between 50 and 80km/h, and the exhaust temperature is controlled to be above 250 so as to judge whether the conversion efficiency of the SCR box is abnormal or not, and obtain and output a judgment result.
If the judgment result indicates that the conversion efficiency of the SCR tank is abnormal, the conversion of the SCR tank is determined to be invalid, optionally, the judgment time can be but is not limited to 1 hour, so that the accuracy of the judgment result is enhanced.
In an alternative embodiment, fig. 2 is a flowchart of an alternative conversion efficiency abnormality determination method according to an embodiment of the present invention, and as shown in fig. 2, determining whether the conversion efficiency of the selective catalytic reduction tank in the target vehicle is abnormal includes:
step S202, acquiring an actual conversion efficiency value and a conversion efficiency limit value of the selective catalytic reduction box;
step S204, comparing the actual conversion efficiency value with the conversion efficiency limit value to obtain a comparison result;
and step S206, judging whether the conversion efficiency of the selective catalytic reduction box is abnormal or not based on the comparison result.
Optionally, in this embodiment of the application, the setting of urea injection to 0 may be cancelled in advance through a diagnostic software, and then an engine raw exhaust NOx concentration value calculated by the ECU is read (optionally, after some fixed models of machines judge that no raw exhaust is abnormal, an upstream NOx sensor actual measurement value is adopted), a downstream NOx concentration value, an actual conversion efficiency value 1 of the SCR box, an actual conversion efficiency value 2 of the SCR box, a conversion efficiency limit value 1 of the SCR box, a conversion efficiency limit value 2 of the SCR box (optionally, some fixed models of machines do not collect the actual conversion efficiency value 2 of the SCR box and the conversion efficiency limit value 2 of the SCR box), an SCR upstream temperature value, a urea injection amount, a urea pump pressure, a vehicle speed, an engine rotation speed, an output torque, an atmospheric pressure, an atmospheric temperature, a battery voltage, engine set oil injection, and an engine torque limit state value.
Optionally, the actual conversion efficiency value may include: the actual SCR tank conversion efficiency value 1, the actual SCR tank conversion efficiency value 2, and the conversion efficiency limit values may include: the method comprises the following steps that 1, a conversion efficiency limit value of an SCR box is 1, 2, wherein the actual conversion efficiency value 1 of the SCR box is correspondingly compared with 1, and a comparison result is obtained; and correspondingly comparing the actual conversion efficiency value 2 of the SCR box with the conversion efficiency limit value 2 of the SCR box to obtain a comparison result.
In an alternative embodiment, as shown in fig. 2, the determining whether the conversion efficiency of the selective catalytic reduction box is abnormal based on the comparison result includes:
step S302, if all comparison results in a set of judgment tests indicate that the actual conversion efficiency value is lower than the conversion efficiency limit value, determining that the conversion efficiency of the selective catalytic reduction box is abnormal, wherein the set of judgment tests includes at least one judgment process.
In an alternative embodiment, the diagnosis software reads the successful calculation times of the conversion efficiency value 1 of the actual SCR box from the ECU, reads the conversion efficiency value 1 of the actual SCR box and the conversion efficiency limit value 1 of the SCR box from the ECU, and compares the conversion efficiency value 1 of the actual SCR box with the conversion efficiency limit value 1 of the SCR box, because from the beginning of monitoring, every four times of judgment processing is a set of judgment tests, if the four times of judgment processing in the set of judgment tests indicate that the conversion efficiency value 1 of the actual SCR box is smaller than the conversion efficiency limit value 1 of the SCR box, the diagnosis software test is finished, and it is determined that the conversion efficiency of the SCR box is too low, i.e. it is determined that the conversion efficiency of the selective catalytic reduction box is abnormal.
In an alternative embodiment, as shown in fig. 2, the determining whether the conversion efficiency of the selective catalytic reduction box is abnormal based on the comparison result includes:
step S402, if there is at least one comparison result in a set of judgment tests indicating that the actual conversion efficiency value is higher than the conversion efficiency limit value, executing a set of judgment tests again;
step S404, calculating whether the number of times that the comparison result in two consecutive groups of the judgment tests indicates that the actual conversion efficiency value is higher than the conversion efficiency limit value is less than a preset number, wherein the preset number is the group capacity of one group of the judgment tests;
step S406, if the calculation result indicates that the times are less than the preset number, determining that the conversion efficiency of the selective catalytic reduction box is abnormal, otherwise, determining that the conversion efficiency of the selective catalytic reduction box is normal.
In the above optional embodiment, if one or more of the comparison results of the four determination processes indicates that the conversion efficiency value 1 of the actual SCR tank is greater than the conversion efficiency limit value 1 of the SCR tank, two sets of determination tests are continuously tested, and two sets of comparison results are calculated for 8 times in total, if the number of times that the conversion efficiency value 1 of the actual SCR tank is greater than the conversion efficiency limit value 1 of the SCR tank is less than 4 times, that is, the occupancy is less than 50%, the diagnostic software test is finished, and it is determined that the conversion efficiency of the SCR tank is too low, that is, it is determined that the conversion efficiency of the selective catalytic reduction tank is abnormal.
As an alternative example, after determining that the conversion efficiency of the selective catalytic reduction box is abnormal, the following contents are displayed in the software interface: and after the test is finished, the actual conversion efficiency value 1 of the SCR box is smaller than the conversion efficiency limit value 1 of the SCR box, the conversion efficiency of the SCR box is judged to be too low, namely the conversion efficiency of the selective catalytic reduction box is determined to be abnormal, the average value of the set of the actual conversion efficiency value 1 of the SCR box and the average value of the conversion efficiency limit value 1 of the SCR box are displayed, and a service station is recommended to clean the SCR box or perform regeneration treatment after the SCR box is processed through diagnostic software.
As an alternative embodiment, in order to enhance the accuracy of the determination result, while determining the above-mentioned conversion efficiency value 1 for the actual SCR tank and the conversion efficiency limit value 1 for the SCR tank, the diagnostic software reads the number of successful calculations of the actual SCR tank conversion efficiency value 2 from the ECU, and reads from it the actual SCR tank conversion efficiency value 2 and the SCR tank conversion efficiency limit value 2, and comparing the actual conversion efficiency value 2 of the SCR box with the conversion efficiency limit value 2 of the SCR box, since every four judgment processes are a group of judgment tests from the beginning of monitoring, if the four judgment processes in the group of judgment tests all obtain comparison results indicating that the actual conversion efficiency value 2 of the SCR box is less than the conversion efficiency limit value 2 of the SCR box, the test of the diagnostic software is finished, and the conversion efficiency of the SCR box is judged to be too low, namely the conversion efficiency of the selective catalytic reduction box is determined to be abnormal.
In the above optional embodiment, if one or more of the comparison results of the four determination processes indicates that the conversion efficiency value 2 of the actual SCR tank is greater than the conversion efficiency limit value 2 of the SCR tank, two sets of determination tests are continuously tested, and two sets of comparison results are calculated for 8 times in total, if the number of times that the conversion efficiency value 2 of the actual SCR tank is greater than the conversion efficiency limit value 2 of the SCR tank is less than 4 times, that is, the occupancy is less than 50%, the diagnostic software test is finished, and it is determined that the conversion efficiency of the SCR tank is too low, that is, it is determined that the conversion efficiency of the selective catalytic reduction tank is abnormal.
As an alternative example, after determining that the conversion efficiency of the selective catalytic reduction box is abnormal, the following contents are displayed in the software interface: and after the test is finished, the actual conversion efficiency value 2 of the SCR box is smaller than the conversion efficiency limit value 2 of the SCR box, the conversion efficiency of the SCR box is judged to be too low, namely the conversion efficiency of the selective catalytic reduction box is determined to be abnormal, the average value of the set of the actual conversion efficiency value 2 of the SCR box and the conversion efficiency limit value 2 of the SCR box is displayed, and a service station is recommended to clean the SCR box or perform regeneration treatment after the SCR box is processed by diagnostic software.
It should be noted that some types of machines may not perform the determination process of the actual conversion efficiency value 2 and the conversion efficiency limit value 2 of the SCR tank.
In an alternative embodiment, as shown in fig. 2, the determining whether the conversion efficiency of the selective catalytic reduction tank in the target vehicle is abnormal includes:
step S502, when the situation that the engine enters an emission monitoring area is monitored, detecting the upstream nitrogen oxide content and the downstream nitrogen oxide content of the engine;
step S504, comparing whether the content of the upstream oxynitride is equal to or greater than a first content threshold value and whether the content of the downstream oxynitride is equal to or greater than a second content threshold value to obtain a comparison result;
in step S506, if the upstream nox content is equal to or greater than the first content threshold and the downstream nox content is equal to or greater than the second content threshold, it is determined that the conversion efficiency of the selective catalytic reduction tank is abnormal.
In the above alternative embodiment, the controller ECU detects the upstream nitrogen oxide content and the downstream nitrogen oxide content of the engine when it is monitored that the engine enters the emission monitoring region, and the diagnostic software reads the upstream nitrogen oxide content and the downstream nitrogen oxide content; comparing whether the content of the upstream oxynitride is equal to or greater than a first content threshold value and whether the content of the downstream oxynitride is equal to or greater than a second content threshold value to obtain a comparison result; optionally, the first content threshold may be, but is not limited to, 40g, and the second content threshold may be, but is not limited to, 30 g.
And if the upstream nitrogen oxide content is equal to or greater than the first content threshold value 40g, and the downstream nitrogen oxide content is equal to or greater than the second content threshold value 30g, determining that the conversion efficiency of the selective catalytic reduction box is abnormal.
As an alternative example, after determining that the conversion efficiency of the selective catalytic reduction box is abnormal, the following contents are displayed in the software interface: and after the test is finished, determining that the conversion efficiency of the SCR box is abnormal, displaying the upstream nitrogen oxide content and the downstream nitrogen oxide content in the group of test processes, and recommending a service station to clean the SCR box, wherein the conversion efficiency of the SCR box is too low.
In an optional embodiment, after outputting the determination result, the method further includes: determining prompt information corresponding to the judgment result; and displaying the judgment result and the prompt information in a display interface.
It should be noted that, the determination processes in the steps S202 to S206, S302, S402 to S406, and S502 to S506 may be performed synchronously, but not limited to this. After all tests are finished, determining prompt information corresponding to the judgment result; and displaying the judgment result and the prompt information in a display interface, and if the judgment result shows no abnormity, storing the test data stream.
It should be noted that the embodiment of the present application may be tested during the operation of the entire vehicle, and no other device is needed except for the diagnostic device. If the SCR box is detached from the whole vehicle and placed on the test bench, the whole vehicle is simulated to run, the upstream temperature and urea injection quantity of the SCR are set, the upstream and downstream NOx concentration values are measured, and the diagnosis efficiency is calculated, the purpose of judging whether the conversion efficiency of the SCR box is invalid can be achieved, but the test bench needs to detach the SCR box of the whole vehicle and does not have the possibility of large-scale popularization.
The embodiment of the application can only add a software function module by means of the existing diagnostic equipment, so that the cost of maintenance personnel is not increased; compare ECU internal logic and report mistake and discharge and exceed standard, only monitor to stable operating mode, define conversion efficiency rapidly, and judge the conversion efficiency of SCR case rapidly under the prerequisite that need not dismouting vehicle part, convenient and fast.
According to the embodiment of the application, the problem that the fault cannot be reported when one of the four monitoring cycles meets the emission standard exceeding conversion efficiency can be eliminated, namely the current situation that the fault cannot be reported when a service station leaves a car and a user runs out of the service station and the fault can be reported when the user leaves the service station is eliminated; the reason that the SCR low-efficiency fault is caused by the original engine emission level or the aging poisoning of the SCR box can be quickly judged. The embodiment of the application is suitable for rapidly judging the conversion efficiency of the SCR box in the market, can assist maintenance personnel in a service station to rapidly determine whether the SCR box is invalid or not, and avoids the phenomenon that a user repeatedly enters the station for maintenance to cause emotional outbreak and excitement contradiction.
Example 2
According to an embodiment of the present invention, there is further provided an embodiment of an apparatus for implementing the method for determining an abnormality of conversion efficiency, fig. 3 is a schematic structural diagram of an apparatus for determining an abnormality of conversion efficiency according to an embodiment of the present invention, and as shown in fig. 3, the apparatus for determining an abnormality of conversion efficiency includes: a monitoring module 30, a determination module 32, a determination module 34, and an output module 36, wherein:
a monitoring module 30 for monitoring an original engine emission concentration value of NOx emitted by an engine of a target vehicle; a determining module 32, configured to determine whether there is an original engine emission degradation in the engine according to the original engine emission concentration value; a judging module 34, configured to judge whether the conversion efficiency of the selective catalytic reduction tank in the target vehicle is abnormal or not if the conversion efficiency of the selective catalytic reduction tank in the target vehicle is not abnormal, and obtain a judgment result; and an output module 36, configured to output the determination result.
In an optional embodiment, the determining module includes: the first acquisition unit is used for acquiring the actual conversion efficiency value and the conversion efficiency limit value of the selective catalytic reduction box; the first comparison unit is used for comparing the actual conversion efficiency value with the conversion efficiency limit value to obtain a comparison result; and the first judgment unit is used for judging whether the conversion efficiency of the selective catalytic reduction box is abnormal or not based on the comparison result.
In an optional embodiment, the first determining unit includes: a first judging subunit, configured to determine that the conversion efficiency of the selective catalytic reduction box is abnormal if all comparison results in a set of judgment tests indicate that the actual conversion efficiency value is lower than the conversion efficiency limit value, where the set of judgment tests includes at least one judgment process.
In an optional embodiment, the first determining unit further includes: an execution unit, configured to execute the set of judgment tests again if at least one comparison result in the set of judgment tests indicates that the actual conversion efficiency value is higher than the conversion efficiency limit; a calculating unit, configured to calculate whether a number of times that the comparison result in two consecutive sets of the determination tests indicates that the actual conversion efficiency value is higher than the conversion efficiency limit value is smaller than a predetermined number, where the predetermined number is a set capacity of one set of the determination tests; and the second judgment subunit is used for determining that the conversion efficiency of the selective catalytic reduction box is abnormal if the calculation result indicates that the times are smaller than the preset number, and otherwise determining that the conversion efficiency of the selective catalytic reduction box is normal.
It should be noted that the above modules may be implemented by software or hardware, for example, for the latter, the following may be implemented: the modules can be located in the same processor; alternatively, the modules may be located in different processors in any combination.
It should be noted that the monitoring module 30, the determining module 32, the judging module 34 and the output module 36 correspond to steps S102 to S108 in embodiment 1, and the modules are the same as the corresponding steps in implementation examples and application scenarios, but are not limited to the disclosure in embodiment 1. It should be noted that the modules described above may be implemented in a computer terminal as part of an apparatus.
It should be noted that, reference may be made to the relevant description in embodiment 1 for alternative or preferred embodiments of this embodiment, and details are not described here again.
The above-mentioned abnormality determination device for conversion efficiency may further include a processor and a memory, and the monitoring module 30, the determining module 32, the determining module 34, the output module 36, and the like are all stored in the memory as program units, and the processor executes the program units stored in the memory to implement corresponding functions.
The processor comprises a kernel, and the kernel calls a corresponding program unit from the memory, wherein one or more than one kernel can be arranged. The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
According to an embodiment of the present application, there is also provided an embodiment of a non-volatile storage medium. Optionally, in this embodiment, the nonvolatile storage medium includes a stored program, and the apparatus in which the nonvolatile storage medium is located is controlled to execute the above-mentioned any method for determining the abnormality of the conversion efficiency when the program runs.
Optionally, in this embodiment, the nonvolatile storage medium may be located in any one of a group of computer terminals in a computer network, or in any one of a group of mobile terminals, and the nonvolatile storage medium includes a stored program.
Optionally, the apparatus in which the non-volatile storage medium is controlled to perform the following functions when the program is executed: monitoring an original engine emission concentration value of an oxynitride emitted by an engine of a target vehicle; determining whether the engine has original emission deterioration according to the original emission concentration value; if not, judging whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal or not to obtain a judgment result; and outputting the judgment result.
According to the embodiment of the application, the embodiment of the processor is also provided. Optionally, in this embodiment, the processor is configured to execute a program, where the program executes any one of the above methods for determining an abnormality of the conversion efficiency when running.
The embodiment of the application provides equipment, the equipment comprises a processor, a memory and a program which is stored on the memory and can run on the processor, and the following steps are realized when the processor executes the program: monitoring an original engine emission concentration value of an oxynitride emitted by an engine of a target vehicle; determining whether the engine has original emission deterioration according to the original emission concentration value; if not, judging whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal or not to obtain a judgment result; and outputting the judgment result.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: monitoring an original engine emission concentration value of an oxynitride emitted by an engine of a target vehicle; determining whether the engine has original emission deterioration according to the original emission concentration value; if not, judging whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal or not to obtain a judgment result; and outputting the judgment result.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (12)
1. A method for judging an abnormality in conversion efficiency, comprising:
monitoring an original engine emission concentration value of an oxynitride emitted by an engine of a target vehicle;
determining whether the engine has original emission deterioration according to the original emission concentration value;
if not, judging whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal or not to obtain a judgment result;
and outputting the judgment result.
2. The method of claim 1, wherein determining whether the conversion efficiency of a selective catalytic reduction tank in the target vehicle is abnormal comprises:
acquiring an actual conversion efficiency value and a conversion efficiency limit value of the selective catalytic reduction box;
comparing the actual conversion efficiency value with the conversion efficiency limit value to obtain a comparison result;
and judging whether the conversion efficiency of the selective catalytic reduction box is abnormal or not based on the comparison result.
3. The method of claim 2, wherein determining whether the conversion efficiency of the selective catalytic reduction tank is abnormal based on the comparison comprises:
and if all comparison results in a group of judgment tests indicate that the actual conversion efficiency value is lower than the conversion efficiency limit value, determining that the conversion efficiency of the selective catalytic reduction box is abnormal, wherein the group of judgment tests comprises at least one judgment treatment.
4. The method of claim 2, wherein determining whether the conversion efficiency of the selective catalytic reduction tank is abnormal based on the comparison comprises:
if at least one comparison result in a group of judgment tests indicates that the actual conversion efficiency value is higher than the conversion efficiency limit value, executing a group of judgment tests again;
calculating whether the times that the comparison results in two consecutive groups of judgment tests indicate that the actual conversion efficiency value is higher than the conversion efficiency limit value are smaller than a preset number, wherein the preset number is the group capacity of one group of judgment tests;
and if the calculation result indicates that the times are smaller than the preset number, determining that the conversion efficiency of the selective catalytic reduction box is abnormal, otherwise, determining that the conversion efficiency of the selective catalytic reduction box is normal.
5. The method of claim 1, wherein determining whether the conversion efficiency of a selective catalytic reduction tank in the target vehicle is abnormal comprises:
detecting the upstream nitrogen oxide content and the downstream nitrogen oxide content of the engine when the engine is monitored to enter an emission monitoring region;
comparing whether the content of the upstream oxynitride is equal to or greater than a first content threshold value and whether the content of the downstream oxynitride is equal to or greater than a second content threshold value to obtain a comparison result;
and if the upstream nitrogen oxide content is equal to or larger than the first content threshold value and the downstream nitrogen oxide content is equal to or larger than the second content threshold value, determining that the conversion efficiency of the selective catalytic reduction box is abnormal.
6. The method of claim 1, wherein after outputting the determination result, the method further comprises:
determining prompt information corresponding to the judgment result;
and displaying the judgment result and the prompt information in a display interface.
7. An abnormality determination device for conversion efficiency, characterized by comprising:
the monitoring module is used for monitoring the original engine emission concentration value of the oxynitride emitted by the engine of the target vehicle;
the determining module is used for determining whether the engine has original engine emission deterioration according to the original engine emission concentration value;
the judging module is used for judging whether the conversion efficiency of the selective catalytic reduction box in the target vehicle is abnormal or not if the conversion efficiency of the selective catalytic reduction box in the target vehicle is not abnormal, and obtaining a judging result;
and the output module is used for outputting the judgment result.
8. The apparatus of claim 7, wherein the determining module comprises:
the first acquisition unit is used for acquiring the actual conversion efficiency value and the conversion efficiency limit value of the selective catalytic reduction box;
the first comparison unit is used for comparing the actual conversion efficiency value with the conversion efficiency limit value to obtain a comparison result;
and the first judgment unit is used for judging whether the conversion efficiency of the selective catalytic reduction box is abnormal or not based on the comparison result.
9. The apparatus according to claim 8, wherein the first determining unit comprises:
and the first judgment subunit is configured to determine that the conversion efficiency of the selective catalytic reduction tank is abnormal if all comparison results in a set of judgment tests indicate that the actual conversion efficiency value is lower than the conversion efficiency limit value, where the set of judgment tests includes at least one judgment process.
10. The apparatus according to claim 8, wherein the first determining unit further comprises:
the execution unit is used for executing the set of judgment tests again if at least one comparison result in the set of judgment tests indicates that the actual conversion efficiency value is higher than the conversion efficiency limit value;
a calculating unit, configured to calculate whether a number of times that the comparison result in two consecutive sets of determination tests indicates that the actual conversion efficiency value is higher than the conversion efficiency limit value is smaller than a predetermined number, where the predetermined number is a group capacity of one set of the determination tests;
and the second judgment subunit is used for determining that the conversion efficiency of the selective catalytic reduction box is abnormal if the calculation result indicates that the times are smaller than the preset number, and otherwise determining that the conversion efficiency of the selective catalytic reduction box is normal.
11. A nonvolatile storage medium, characterized in that the nonvolatile storage medium includes a stored program, wherein a device in which the nonvolatile storage medium is located is controlled to execute the abnormality determination method for conversion efficiency according to any one of claims 1 to 6 when the program runs.
12. A processor configured to execute a program stored in a memory, wherein the program executes the method for determining an abnormality in conversion efficiency according to any one of claims 1 to 6.
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