CN113803141A - DOC sulfur poisoning detection method, storage medium and system - Google Patents
DOC sulfur poisoning detection method, storage medium and system Download PDFInfo
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- CN113803141A CN113803141A CN202010530882.8A CN202010530882A CN113803141A CN 113803141 A CN113803141 A CN 113803141A CN 202010530882 A CN202010530882 A CN 202010530882A CN 113803141 A CN113803141 A CN 113803141A
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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
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/0245—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by increasing temperature of the exhaust gas leaving the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
- F02D41/028—Desulfurisation of NOx traps or adsorbent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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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
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
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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 relates to the technical field of aftertreatment of diesel engines, in particular to a method, a storage medium and a system for detecting DOC sulfur poisoning, which are used for detecting whether DOC is poisoned by sulfur in an aftertreatment system, and solve the problems that in the prior art, a method for detecting DOC sulfur poisoning aiming at an EGR aftertreatment system is not available, and DOC sulfur poisoning cannot be found in time; the method comprises the following steps: a fuel injector of the engine injects diesel into a cylinder, the diesel is converted into HC through incomplete combustion in the cylinder, the HC reaches an inlet of the DOC, the temperature T1 at the inlet of the DOC is collected, the DOC catalyzes the HC, the temperature T2 at an outlet of the DOC is collected, a first temperature rise rate T1 of the DOC is calculated to be (T2-T1)/T1, and whether T1 is smaller than a preset poisoning threshold value is judged, so that whether sulfur poisoning exists in the DOC is judged; and the early sulfur poisoning of DOC is found in time, and the user is reminded to take measures to prevent larger loss.
Description
Technical Field
The invention relates to the technical field of aftertreatment of diesel engines, in particular to a DOC sulfur poisoning detection method, a storage medium and a system.
Background
With the high concern of people on improving living environment and reducing air pollution sources, the automobile exhaust is taken as a main pollution source of air pollution, the problem of automobile exhaust pollution is urgently solved, and therefore, the automobile exhaust post-treatment technology is well developed. An Exhaust Gas Recirculation (EGR) system and a Selective Catalytic Reduction (SCR) system are common diesel engine aftertreatment systems at present, the EGR system is used for returning part of Exhaust Gas discharged by an engine to an air inlet manifold and then enters a cylinder together with fresh mixed Gas, and the SCR system is used for injecting reducing agent ammonia or urea under the action of a catalyst to reduce nitrogen oxide NOx in tail Gas into nitrogen N2And water H2O。
An Oxidation Catalyst (DOC) and a particle trap (DPF) are installed in an EGR aftertreatment system of a Diesel engine, the DOC can reduce pollutant emission in exhaust gas through various physical and chemical actions, and can catalyze Hydrocarbons (HC) and emit heat at the same time, and the DPF can trap Particulate emission before the Particulate emission enters the atmosphere. However, when high-sulfur oil is used, the catalyst of DOC is poisoned by sulfur, which affects the catalytic effect of DOC, if sulfur poisoning is more and more serious due to not being found in time, the DOC may lose catalytic reaction and DPF regeneration cannot be performed normally, thereby affecting the operation of the whole exhaust system. Therefore, it is important to detect DOC sulfur poisoning in time and perform desulfurization treatment.
Currently, in an SCR aftertreatment system, whether the SCR is sulfur-poisoned or not can be determined by detecting the conversion rate of NOx, thereby determining whether the DOC is sulfur-poisoned or not. However, because the reductant ammonia or urea does not exist in the EGR aftertreatment system, the method cannot be used for the EGR aftertreatment system, and at present, no method capable of effectively detecting DOC sulfur poisoning exists in the EGR aftertreatment system, so that the DOC can not be timely found and reminded of sulfur poisoning, and only when the automobile exhaust fails, the DOC can be checked, and inconvenience is easily caused.
Disclosure of Invention
The invention aims to: in order to solve the problems, the invention provides a DOC sulfur poisoning detection method, a storage medium and a system, which judge whether the oxidation catalyst is poisoned by sulfur by acquiring the temperatures of an inlet and an outlet of the oxidation catalyst and calculating the temperature rise rate, timely find and remind a user to take measures to prevent larger loss, and solve the problems that the oxidation catalyst cannot be timely found to be poisoned without a method for detecting the sulfur poisoning of the oxidation catalyst by aiming at an EGR (exhaust gas recirculation) post-treatment system in the prior art.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a method for detecting DOC sulfur poisoning, the method comprising:
a fuel injector of the engine injects diesel into a cylinder, the diesel is converted into hydrocarbon through incomplete combustion in the cylinder, and the hydrocarbon is conveyed to an oxidation type catalyst through an exhaust pipe by the cylinder;
collecting a temperature T1 at an inlet of the oxidation catalyst when the hydrocarbons reach the oxidation catalyst inlet;
collecting the temperature T2 at the outlet of the oxidation catalyst after the oxidation catalyst catalyzes the hydrocarbon;
calculating the first temperature rise rate T1 ═ T2-T1)/T1 of the oxidation catalyst;
and (4) judging whether the t1 is smaller than a preset poisoning threshold value, if so, judging that the oxidation type catalyst has sulfur poisoning, and if not, judging that the oxidation type catalyst works normally.
According to an embodiment of the present invention, optionally, in the DOC sulfur poisoning detection method, when it is determined that the oxidation catalyst has sulfur poisoning, the method further includes: and (4) carrying out desulfurization treatment on the oxidation type catalyst with sulfur poisoning, and prompting a user that the oil product is unqualified.
According to an embodiment of the present invention, optionally, in the DOC sulfur poisoning detection method, the desulfurization treatment includes increasing an injection amount of diesel fuel injected into a cylinder by an injector of the engine, and continuing to inject the diesel fuel into the cylinder.
According to an embodiment of the present invention, optionally, in the method for detecting DOC sulfur poisoning, in injecting diesel oil into a cylinder by an injector of the engine, the amount of the injected diesel oil is 3mg to 6 mg; during the desulfurization treatment, the fuel injector of the engine increases the injection quantity of the diesel fuel injected into the cylinder, and the increased injection quantity of the diesel fuel is 6-8 mg.
According to an embodiment of the present invention, optionally, in the DOC sulfur poisoning detection method, during the desulfurization treatment, temperatures at an inlet and an outlet of the oxidation catalyst are continuously collected at intervals to obtain a second temperature increase rate t2 of the oxidation catalyst, and it is determined whether t2 is smaller than a preset desulfurization threshold, and if the temperature is smaller than the preset desulfurization threshold, desulfurization is continued; if the value is larger than or equal to the preset desulfurization threshold value, the desulfurization is finished;
and if the temperature rise rate t2 is still less than the preset desulfurization threshold value after the preset time threshold value, the desulfurization fails, and an instrument gives an alarm to prompt a user to maintain.
According to an embodiment of the present invention, optionally, in the method for detecting DOC sulfur poisoning, the preset desulfurization threshold is higher than the preset poisoning threshold.
According to an embodiment of the invention, optionally, in the method for detecting DOC sulfur poisoning, after the time period that the oxidation catalyst catalyzes the hydrocarbon reaches the preset time period, the temperature T2 at the outlet of the oxidation catalyst is collected.
According to an embodiment of the present invention, optionally, in the above method for detecting DOC sulfur poisoning, the method further includes: a detection time interval of sulfur poisoning of the oxidation catalyst is set based on an engine regeneration cycle, wherein at least one detection time node of sulfur poisoning of the oxidation catalyst which is not coincident with the engine regeneration time node is set on one engine regeneration cycle.
According to an embodiment of the present invention, optionally, in the above method for detecting DOC sulfur poisoning, the method further includes: after the detection time node is reached, judging the state of the automobile:
if the automobile is in a parking state, testing the temperature at the inlet of the oxidation type catalytic converter, and only when the tested temperature reaches the lowest temperature threshold value, starting to detect sulfur poisoning;
and if the automobile is in a driving state, testing the temperature at the inlet of the oxidation type catalyst, and starting sulfur poisoning detection only when the test temperature reaches a stable state, wherein when the duration of the test temperature kept in a specified temperature range meets a preset condition, the test temperature reaches the stable state.
According to an embodiment of the invention, optionally, in the method for detecting DOC sulfur poisoning, a value range of the minimum temperature threshold value is 280-.
In a second aspect, the present invention provides a storage medium having stored thereon a computer program executable by one or more processors to implement a method for detecting DOC sulfur poisoning as described above.
In a third aspect, the present invention provides a DOC sulfur poisoning detection system, comprising:
temperature sensors for detecting temperatures at an inlet and an outlet of the oxidation catalyst;
and a processor for executing a computer program to implement the DOC sulfur poisoning detection method as described above.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
1. according to the DOC sulfur poisoning detection method, the storage medium and the system, the temperature rise rate is calculated by collecting the temperatures of the inlet and the outlet of the oxidation catalyst in the automobile exhaust pipe, so that whether sulfur poisoning exists in the oxidation catalyst is judged, early sulfur poisoning of the oxidation catalyst is found in time, a user is reminded to take measures, and compared with the existing mode that the fault is caused by the occurrence of a problem and then the fault is eliminated and detected, the DOC sulfur poisoning detection method, the storage medium and the system save time, discover the sulfur poisoning sign earlier and stop damage in time.
2. In the invention, the oxidation type catalyst with sulfur poisoning is subjected to desulfurization treatment, and the sulfur on the surface of the oxidation type catalyst is treated by using the temperature rise, so that the oxidation type catalyst is prevented from permanently failing due to the continuous sulfur poisoning of the oxidation type catalyst, and the larger loss of a user is avoided; and the user is prompted that the oil product is unqualified, the quality of the current engine oil is identified according to the primary judgment result, the oil product condition of the user is prompted, the inferior fuel oil is prevented from damaging the engine or other parts, and the good refueling habit of the user is facilitated.
3. In the invention, the preset desulfurization threshold is higher than the preset poisoning threshold, so that whether desulfurization is successfully carried out or not is conveniently identified, whether the oxidation type catalyst has a fault that maintenance is necessary or not is judged, and the better catalytic effect of the oxidation type catalyst after desulfurization treatment can be ensured.
4. According to the invention, after the detection time node is reached, the state of the automobile is judged, and the temperature at the inlet of the oxidation type catalytic converter is tested, so that the problem of detection error caused by substandard temperature or unstable temperature at the inlet of the oxidation type catalytic converter can be prevented.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a DOC sulfur poisoning detection method provided by the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the corresponding technical effects can be fully understood and implemented. The embodiments of the present invention and the features of the embodiments can be combined with each other without conflict, and the formed technical solutions are within the scope of the present invention.
Example one
Referring to fig. 1, an embodiment of the present invention provides a method for detecting DOC sulfur poisoning, including the following steps:
step a 1: for an automobile adopting a non-SCR aftertreatment system, for example, an automobile adopting an EGR system, a DOC and a DPF are arranged in an exhaust pipe of an engine, and a DOC sulfur poisoning detection time interval is set based on an engine regeneration period when the automobile is subjected to factory test operation, wherein at least one DOC sulfur poisoning detection time node which is not coincident with the engine regeneration time node is set on one engine regeneration period, for example, the regeneration period of the engine is 100 hours, and the detection time interval is set to be 25 hours, then the DOC sulfur poisoning detection time node of the engine is 25 hours, 50 hours and 75 hours when the engine runs;
step a 2: after the detection time node is reached, judging the state of the automobile, and testing the temperature at the inlet of the DOC;
specifically, after the detection time node is reached, the instrument panel prompts a user to perform DOC sulfur poisoning detection, the user can actively park the automobile for detection, at the moment, the automobile is in a parking state, the user presses a detection button, the engine enters a parking detection working condition, after the temperature at the inlet of the DOC reaches a minimum temperature threshold value, DOC sulfur poisoning detection is started, the value range of the minimum temperature threshold value is 280-300 ℃, and in the embodiment, the minimum temperature threshold value is set to be 300 ℃;
step a 3: injecting 3-6 mg of diesel oil into a cylinder by an oil injector of the engine, wherein the diesel oil is converted into HC through incomplete combustion in the cylinder, and the HC is conveyed to DOC through an exhaust pipe by the cylinder;
step a 4: when HC reaches the DOC inlet, collecting the temperature T1 at the DOC inlet, wherein in the embodiment, the temperature T1 is 300 ℃;
step a 5: when the HC catalysis time of the DOC reaches a preset time, acquiring the temperature T2 at the outlet of the DOC, wherein the preset time is 5-10min, and in the embodiment, acquiring T2-520 ℃;
step a 6: calculating the first temperature rise rate T1 of the DOC to be (T2-T1)/T1, in the embodiment, substituting the data into the temperature rise rate calculation formula to obtain that T1 to be (520 and 300)/300 to be 73.33%;
step a 7: judging whether t1 is smaller than a preset poisoning threshold value, if so, judging that sulfur poisoning exists in the DOC, and if not, judging that the DOC works normally; in this embodiment, the preset poisoning threshold is set to 66.67%, which may be specifically set according to the actual situation of the vehicle, and the t1 ═ 73.33% obtained in step a6 is greater than the preset poisoning threshold, which indicates that the DOC is operating normally, and this detection is finished.
In the embodiment, in the parking state, the DOC sulfur poisoning detection is started after the temperature at the inlet of the DOC reaches the minimum temperature threshold value, so that the problem that the detection result is inaccurate as the detection is carried out when the temperature at the inlet does not reach the standard can be solved; the temperature rise rate is calculated by collecting the temperatures of the inlet and the outlet of the DOC, so that whether sulfur poisoning exists in the DOC is judged, the judgment is simple and not complex, and compared with the existing mode of troubleshooting and detection after the fault occurs, the time is saved.
Example two
Referring to fig. 1, an embodiment of the present invention provides a method for detecting DOC sulfur poisoning, including the following steps:
step b 1: for an automobile adopting a non-SCR aftertreatment system, for example, an automobile adopting an EGR system, a DOC and a DPF are arranged in an exhaust pipe of an engine, and a DOC sulfur poisoning detection time interval is set based on an operation regeneration period of the engine when the automobile is subjected to factory test operation, wherein at least one DOC sulfur poisoning detection time node is set on one engine regeneration period, for example, the regeneration period of the engine is 100 hours, the detection time interval is set to be 25 hours, and then the DOC sulfur poisoning detection time node of the engine is that the engine runs to 25 hours, 50 hours and 75 hours;
step b 2: after the detection time node is reached, judging the state of the automobile, and testing the temperature at the inlet of the DOC;
specifically, after the detection time node is reached, the instrument panel prompts a user to perform DOC sulfur poisoning detection, the user can keep driving and automatically detect the DOC sulfur poisoning, at the moment, the automobile is in a driving state, and after the temperature at the entrance of the DOC reaches a stable state, the DOC sulfur poisoning detection is started, wherein when the duration of the test temperature kept in the specified temperature range meets the preset condition, the test temperature reaches the stable state, in the embodiment, when the test temperature is kept in the range of 280 plus 350 ℃ for 10min, the test temperature reaches the stable state;
step b 3: injecting 3-6 mg of diesel oil into a cylinder by an oil injector of the engine, wherein the diesel oil is converted into HC through incomplete combustion in the cylinder, and the HC is conveyed to DOC through an exhaust pipe by the cylinder; (ii) a
Step b 4: when HC reaches the DOC inlet, collecting the temperature T1 at the DOC inlet, wherein in the embodiment, the temperature T1 is 300 ℃;
step b 5: when the HC catalysis time of the DOC reaches a preset time, acquiring the temperature T2 at the outlet of the DOC, wherein the preset time is 5-10min, and in the embodiment, acquiring T2-450 ℃;
step b 6: calculating the first temperature rise rate T1 of the DOC to be (T2-T1)/T1, in the embodiment, substituting the data into the temperature rise rate calculation formula to obtain that T1 to be (450-;
step b 7: judging whether t1 is smaller than a preset poisoning threshold value, if so, judging that sulfur poisoning exists in the DOC, and if not, judging that the DOC works normally; in this embodiment, the preset poisoning threshold is set to 66.67%, which may be specifically set according to the actual situation of the vehicle, and the t1 obtained in step b6 is 50% smaller than the preset poisoning threshold, which indicates that sulfur poisoning exists in the DOC;
step b 8: the method comprises the following steps of carrying out desulfurization treatment on DOC with sulfur poisoning, and prompting a user that oil products are unqualified through an instrument panel, wherein the desulfurization treatment comprises the steps of increasing the injection quantity of diesel oil injected into a cylinder by an oil injector of an engine and continuously injecting the diesel oil into the cylinder, and in the embodiment, the injection quantity of the diesel oil injected into the cylinder is increased to 6-8 mg;
meanwhile, continuously collecting temperatures at the DOC inlet and the DOC outlet at intervals to obtain a second temperature rise rate t2 of the DOC, judging whether t2 is smaller than a preset desulfurization threshold value, and if so, continuing desulfurization; if the value is larger than or equal to the preset desulfurization threshold value, the desulfurization is finished;
if the temperature rise rate t2 is still less than the preset desulfurization threshold after 1 hour of the preset time threshold, indicating that desulfurization is failed, and alarming through an instrument to prompt a user to maintain;
specifically, the preset desulfurization threshold is higher than the preset poisoning threshold by 6.66% -10%, and may be set specifically according to the actual conditions of the automobile, in this embodiment, the preset desulfurization threshold is set to be higher than the preset poisoning threshold by 6.66%, that is, the preset desulfurization threshold is 73.33%, and a plurality of t2 are continuously obtained along with continuous injection of diesel oil in the desulfurization process; if t2 is less than 73.33%, continuing to desulfurize, continuing to inject diesel oil into the cylinder by the oil injector, treating sulfur on the surface of the DOC by using temperature rise, after 1 hour, if t2 is still less than 73.33%, indicating desulfurization failure, and alarming by an instrument to prompt a user to maintain; if t2 is greater than or equal to 73.33%, desulfurization is successful, and detection is finished.
In the embodiment, during the running state, the DOC sulfur poisoning detection is automatically carried out, the detection is carried out without stopping specially, and the detection is started when the temperature at the DOC inlet reaches the stable state, so that the detection error caused by the unstable temperature at the DOC inlet can be prevented; the early sulfur poisoning of DOC is discovered in time, the user is reminded to take measures, and compared with the existing mode of troubleshooting and detection after the fault caused by the problem, the early sulfur poisoning sign is discovered earlier, and the damage can be stopped in time; the desulfurization treatment can prevent DOC from permanently failing due to continuous sulfur poisoning of DOC, and avoid larger loss to users; the instrument panel prompts a user that the oil product is unqualified, so that the quality of the current oil can be identified, the inferior fuel oil is prevented from damaging an engine or other parts, and the good refueling habit of the user is facilitated; the preset desulfurization threshold value is higher than the preset poisoning threshold value, whether desulfurization is successfully carried out or not is conveniently identified, so that whether the oxidation type catalyst has a fault that maintenance is necessary or not is judged, and the better catalytic effect of the oxidation type catalyst after desulfurization treatment can be ensured.
EXAMPLE III
Embodiments of the present invention further provide a computer-readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, a server, an App, etc., on which a computer program is stored, which when executed by a processor may implement the following method steps:
step 1: setting a detection time interval of sulfur poisoning of the oxidation catalyst based on an operation regeneration period of the engine when the engine of a new vehicle is in initial operation, and setting a plurality of detection time nodes of sulfur poisoning of the oxidation catalyst on one engine regeneration period;
step 2: after the detection time node is reached, judging the state of the automobile:
if the automobile is in a parking state, testing the temperature at the inlet of the oxidation type catalytic converter, and only when the tested temperature reaches the lowest temperature threshold value, starting to detect sulfur poisoning;
if the automobile is in a driving state, testing the temperature at the inlet of the oxidation type catalyst, and detecting sulfur poisoning only after the tested temperature reaches a stable state;
and step 3: a fuel injector of the engine injects diesel into a cylinder, the diesel is converted into hydrocarbon through incomplete combustion in the cylinder, and the hydrocarbon is conveyed to an oxidation type catalyst through an exhaust pipe by the cylinder;
and 4, step 4: collecting a temperature T1 at an inlet of the oxidation catalyst when the hydrocarbons reach the oxidation catalyst inlet;
and 5: collecting the temperature T2 at the outlet of the oxidation catalyst after the oxidation catalyst catalyzes the hydrocarbon;
step 6: calculating the first temperature rise rate T1 ═ T2-T1)/T1 of the oxidation catalyst;
and 7: judging whether t1 is smaller than a preset poisoning threshold value, if so, judging that sulfur poisoning exists in the oxidation type catalyst, and if not, judging that the oxidation type catalyst works normally;
and 8: carrying out desulfurization treatment on the oxidation type catalyst with sulfur poisoning and prompting a user that the oil product is unqualified;
in the desulfurization treatment process, continuously collecting the temperatures at the inlet and the outlet of the oxidation catalyst at intervals to obtain a second temperature rise rate t2 of the oxidation catalyst, judging whether t2 is smaller than a preset desulfurization threshold value, and if so, continuing desulfurization; if the poisoning threshold value is greater than or equal to the preset poisoning threshold value, the desulfurization is finished;
and if the temperature rise rate t2 is still less than the preset desulfurization threshold value after the preset time threshold value, the desulfurization fails, and an instrument gives an alarm to prompt a user to maintain.
The specific embodiment process of the above method steps can be referred to in the first embodiment and the second embodiment, and the detailed description of the embodiment is not repeated herein.
Example four
The embodiment of the invention also provides a system for detecting DOC sulfur poisoning, which comprises:
the temperature sensor is used for detecting the temperatures at the inlet and the outlet of the DOC;
a processor for executing all or part of the steps of the method for detecting DOC sulfur poisoning in the first embodiment or the second embodiment and outputting the detection result;
and the instrument panel is used for displaying prompt information according to the detection result output by the processor.
Specifically, the Processor may be implemented by an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor or other electronic components, and is configured to perform the method for detecting DOC poisoning in the first embodiment or the second embodiment.
In conclusion, the DOC sulfur poisoning detection method, the storage medium and the system are used for detecting the DOC sulfur poisoning condition, and calculating the temperature rise rate by collecting the temperature at the inlet and the temperature at the outlet of the DOC in the automobile exhaust pipe, so that whether the DOC is subjected to sulfur poisoning or not is judged, the DOC early-stage sulfur poisoning is found in time, and a user is reminded to take measures, so that the time is saved, the sulfur poisoning sign is found earlier, and the damage can be stopped in time compared with the conventional mode of troubleshooting and detection after the fault occurs; the DOC with sulfur poisoning is subjected to desulfurization treatment, and the sulfur on the surface of the oxidation type catalyst is treated by using temperature rise, so that the DOC is prevented from permanently failing due to continuous sulfur poisoning, and the larger loss of a user is avoided; and the user is prompted that the oil product is unqualified, the quality of the current oil consumption is identified according to the primary judgment result, the oil product condition of the user is prompted, the inferior fuel oil is prevented from damaging an engine or other parts, and the good refueling habit of the user is facilitated.
In the embodiments provided in the present invention, it should be understood that the disclosed system and method can be implemented in other ways. The system and method embodiments described above are exemplary only.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for detecting DOC sulfur poisoning, the method comprising:
a fuel injector of the engine injects diesel into a cylinder, the diesel is converted into hydrocarbon through incomplete combustion in the cylinder, and the hydrocarbon is conveyed to an oxidation type catalyst through an exhaust pipe by the cylinder;
collecting a temperature T1 at an inlet of the oxidation catalyst when the hydrocarbons reach the oxidation catalyst inlet;
collecting the temperature T2 at the outlet of the oxidation catalyst after the oxidation catalyst catalyzes the hydrocarbon;
calculating the first temperature rise rate T1 ═ T2-T1)/T1 of the oxidation catalyst;
and (4) judging whether the t1 is smaller than a preset poisoning threshold value, if so, judging that the oxidation type catalyst has sulfur poisoning, and if not, judging that the oxidation type catalyst works normally.
2. The DOC sulfur poisoning detection method according to claim 1, wherein when it is determined that sulfur poisoning is present in the oxidation catalyst, the method further includes: and (4) carrying out desulfurization treatment on the oxidation type catalyst with sulfur poisoning, and prompting a user that the oil product is unqualified.
3. The DOC sulfur poisoning detection method according to claim 2, wherein the desulfurization process includes an injector of the engine increasing an injection amount of the in-cylinder injection diesel fuel and continuing to inject the in-cylinder injection diesel fuel.
4. The DOC sulfur poisoning detection method according to claim 2 or 3, wherein in the desulfurization treatment process, the temperatures at the inlet and the outlet of the oxidation catalyst are continuously collected at intervals to obtain a second temperature increase rate t2 of the oxidation catalyst, whether t2 is smaller than a preset desulfurization threshold value or not is judged, and if so, desulfurization is continued; if the value is larger than or equal to the preset desulfurization threshold value, the desulfurization is finished;
and if the temperature rise rate t2 is still less than the preset desulfurization threshold value after the preset time threshold value, the desulfurization fails, and an instrument gives an alarm to prompt a user to maintain.
5. The method of claim 4, wherein the predetermined desulfation threshold is higher than the predetermined poisoning threshold.
6. The method for detecting DOC sulfur poisoning according to claim 1, wherein the temperature T2 at the outlet of the oxidation catalyst is collected after the time period that the oxidation catalyst catalyzes the hydrocarbon reaches a preset time period.
7. The method for detecting DOC sulfur poisoning according to claim 1, further comprising: a detection time interval of sulfur poisoning of the oxidation catalyst is set based on an engine regeneration cycle, wherein at least one detection time node of sulfur poisoning of the oxidation catalyst which is not coincident with the engine regeneration time node is set on one engine regeneration cycle.
8. The method for detecting DOC sulfur poisoning according to claim 7, further comprising: after the detection time node is reached, judging the state of the automobile:
if the automobile is in a parking state, testing the temperature at the inlet of the oxidation type catalytic converter, and only when the tested temperature reaches the lowest temperature threshold value, starting to detect sulfur poisoning;
and if the automobile is in a driving state, testing the temperature at the inlet of the oxidation type catalyst, and starting sulfur poisoning detection only when the test temperature reaches a stable state, wherein when the duration of the test temperature kept in a specified temperature range meets a preset condition, the test temperature reaches the stable state.
9. A storage medium having stored thereon a computer program executable by one or more processors to implement a method for detecting DOC sulfur poisoning according to any one of claims 1 to 8.
10. A DOC sulfur poisoning detection system, comprising:
temperature sensors for detecting temperatures at an inlet and an outlet of the oxidation catalyst;
a processor for executing a computer program for implementing the method for detecting DOC sulfur poisoning according to any one of claims 1 to 8.
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