CN109578123B - Failure judgment method and device for diesel oxidation catalyst - Google Patents
Failure judgment method and device for diesel oxidation catalyst Download PDFInfo
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- CN109578123B CN109578123B CN201811424117.7A CN201811424117A CN109578123B CN 109578123 B CN109578123 B CN 109578123B CN 201811424117 A CN201811424117 A CN 201811424117A CN 109578123 B CN109578123 B CN 109578123B
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity 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
- 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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of 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
Abstract
The invention provides a failure judgment method and a device for a diesel oxidation catalyst, which are applied to the technical field of automobiles, the method comprises the steps of obtaining the current outlet temperature of a DOC when the regeneration process starts for a first preset time, judging the difference value between a set temperature threshold value and the current outlet temperature, adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold value within a second preset time if the obtained difference value is greater than a temperature difference threshold value, changing the fuel injection quantity of a fuel nozzle from small to large in the process that the set temperature rises from the current outlet temperature to the set temperature threshold value so as to gradually rise the outlet temperature of the DOC, repeatedly carrying out the adjustment process, carrying out multiple times of repeated combustion on the DOC after multiple times of adjustment processes, and judging that the DOC has failed if the difference value between the set temperature threshold value and the outlet temperature of the DOC is still greater than the temperature difference threshold value after multiple times, the DOC which fails is required to be replaced in time, and the DPF regeneration effect is ensured.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a method and a device for judging failure of an oxidation catalyst of a diesel engine.
Background
Referring to fig. 1, fig. 1 shows a regeneration system in which a DOC (Diesel Oxidation Catalyst) assists a DPF (Diesel Particulate Filter) to regenerate, wherein a fuel nozzle 2 is disposed at a front end of an inlet of a DOC1, an outlet of a DOC1 is communicated with an inlet of a DPF3, and automobile exhaust enters the DPF2 from the DOC1 to be filtered.
In the process of adopting the DOC to assist the regeneration of the DPF, the fuel nozzle 2 can inject fuel to the DOC1 inlet, and the fuel is oxidized and catalyzed inside the DOC1 and then is combusted together with automobile exhaust gas, so that the temperature of the automobile exhaust gas entering the DPF2 is improved, and the regeneration process of the DPF2 is smoothly carried out.
However, since the fuel added to the vehicle contains more sulfur components, after the fuel enters the DOC, part of the sulfur components are attached to the surface of the oxidation catalyst, so that the DOC fails over time, and if the fuel is still used after the DOC fails, the regeneration effect of the DPF is seriously affected.
Therefore, how to judge whether the DOC is invalid or not, so as to timely replace the invalid DOC and ensure the DPF regeneration effect becomes one of the technical problems to be urgently solved by technical personnel in the field.
Disclosure of Invention
In view of the above, the present invention aims to provide a method and a device for determining failure of a diesel oxidation catalyst, which can determine whether a DOC fails, so as to replace the failed DOC in time and ensure a DPF regeneration effect, and the specific scheme is as follows:
in a first aspect, the present invention provides a method for determining a failure of an oxidation catalyst of a diesel engine, including:
when the regeneration process starts for a first preset time length, acquiring the current outlet temperature of a diesel oxidation catalyst DOC;
if the difference value between the set temperature threshold and the current outlet temperature is greater than the temperature difference threshold, adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold within a second preset time period, and accumulating the adjustment times;
obtaining an adjusted temperature, wherein the adjusted temperature is the outlet temperature of the DOC after the set temperature is adjusted;
updating the current outlet temperature to the adjusted temperature, returning to execute the step of adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold within a second preset time length if the difference value between the set temperature threshold and the current outlet temperature is greater than a temperature difference threshold, and accumulating the adjustment times until the adjustment times reach a preset frequency threshold;
and if the adjusting times reach the preset frequency threshold, judging that the DOC is invalid when the difference value between the set temperature threshold and the current outlet temperature is greater than the temperature difference threshold.
Optionally, the method for determining a failure of a diesel oxidation catalyst provided by the first aspect of the present invention further includes:
and before the adjusting times reach the preset frequency threshold value and when the adjusting times reach the preset frequency threshold value, if the difference value between the set temperature threshold value and the current outlet temperature is less than or equal to the temperature difference threshold value, judging that the DOC is effective.
Optionally, the method for determining a failure of a diesel oxidation catalyst provided by the first aspect of the present invention further includes:
acquiring a regeneration activation instruction;
and counting the starting time of the regeneration process according to the regeneration activation instruction.
Optionally, the adjusting the set temperature within the second preset time period to rise from the current outlet temperature to the set temperature threshold includes:
determining a heating rate;
and within a second preset time, adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold value at the heating rate.
Optionally, the determining the temperature increase rate includes:
dividing the difference value between the set temperature threshold and the current outlet temperature by the second preset time length to obtain a first quotient;
and determining the first quotient value as a temperature rising rate.
Optionally, the adjusting the set temperature within the second preset time period to rise from the current outlet temperature to the set temperature threshold includes:
determining a temperature rise step value;
and within a second preset time, adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold according to the temperature rise step value.
Optionally, the determining the temperature increase step value includes:
dividing the difference value between the set temperature threshold and the current outlet temperature by a preset step number to obtain a second quotient;
and determining the second quotient value as a temperature rise step value.
Optionally, the method for determining the failure of the diesel oxidation catalyst according to any one of the first aspect of the present invention further includes
And sending fault prompt information after the DOC is judged to be invalid.
In a second aspect, the present invention provides a diesel oxidation catalyst failure determination device, the device including:
the device comprises a first obtaining unit, a second obtaining unit and a control unit, wherein the first obtaining unit is used for obtaining the current outlet temperature of the diesel oxidation catalyst DOC when the regeneration process starts for a first preset time;
the adjusting counting unit is used for adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold within a second preset time length and accumulating the adjusting times if the difference value between the set temperature threshold and the current outlet temperature is greater than a temperature difference threshold;
the second acquiring unit is used for acquiring the adjusted temperature, wherein the adjusted temperature is the outlet temperature of the DOC after the set temperature is adjusted;
the updating circulation unit is used for updating the current outlet temperature to the adjusted temperature, and returning to execute the steps of adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold within a second preset time length if the difference value between the set temperature threshold and the current outlet temperature is greater than a temperature difference threshold, and accumulating the adjustment times until the adjustment times reach a preset frequency threshold;
and the first judgment unit is used for judging that the DOC is invalid if the difference value between the set temperature threshold and the current outlet temperature is greater than the temperature difference threshold when the adjustment times reach the preset frequency threshold.
Optionally, the failure determination device for a diesel oxidation catalyst according to a second aspect of the present invention further includes:
and the second judgment unit is used for judging that the DOC is effective if the difference value between the set temperature threshold and the current outlet temperature is less than or equal to the temperature difference threshold before the adjustment times reach the preset frequency threshold and when the adjustment times reach the preset frequency threshold.
Based on the technical scheme, the failure judgment method and the failure judgment device for the diesel oxidation catalyst provided by the invention have the advantages that the current outlet temperature of the DOC of the diesel oxidation catalyst is obtained when the regeneration process starts for the first preset time, and the DOC has enough time to heat up after the first preset time, so that the obtained outlet temperature can reflect the real state of the DOC. And then judging the difference value between the set temperature threshold value and the current outlet temperature, if the obtained difference value is greater than the temperature difference threshold value, adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold value within a second preset time period, wherein in the prior art, the fuel injection quantity of the fuel nozzle is in a closed-loop control relation with the set temperature, and the fuel injection quantity of the fuel nozzle changes from small to large in the process of rising from the current outlet temperature to the set temperature threshold value, so that the combustion inside the DOC is more and more intense, and sulfur components attached inside the DOC are gradually consumed, so that the outlet temperature of the DOC is gradually raised.
And if the difference value between the set temperature threshold value and the DOC outlet temperature is still larger than the temperature difference threshold value after the adjustment, the adjustment process is repeatedly carried out. And taking the number of times of adjusting the set temperature as a condition for stopping the circulation process, after the adjustment process for a plurality of times, repeatedly burning the DOC, stopping the circulation when the number of times reaches a preset frequency threshold, and if the difference value between the set temperature threshold and the outlet temperature of the DOC is still larger than a temperature difference threshold, judging that the DOC is invalid and cannot recover the oxidation catalysis function.
The failure judgment method for the diesel oxidation catalyst provided by the invention can judge whether the DOC fails or not, so that the failed DOC is replaced in time, and the DPF regeneration effect is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a DOC assisted DPF regeneration system of the prior art;
FIG. 2 is a flow chart of a diesel oxidation catalyst failure determination method provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a process of adjusting a set temperature by applying the method for determining the failure of a diesel oxidation catalyst according to the embodiment of the present invention;
fig. 4 is a block diagram showing a configuration of a diesel oxidation catalyst failure determination device according to an embodiment of the present invention;
fig. 5 is a block diagram showing another diesel oxidation catalyst failure determination device according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Referring to fig. 2, fig. 2 is a flowchart of a method for determining a failure of a diesel oxidation catalyst according to an embodiment of the present invention, where the method is applicable to an exhaust gas control system of a motor vehicle using diesel as a power fuel, and obviously, the exhaust gas control system may also be implemented by using a server on a network side in some cases; referring to fig. 2, a method for determining a failure of a diesel oxidation catalyst according to an embodiment of the present invention may include:
in step S100, a regeneration activation command is acquired.
In the prior art, a control strategy (not described herein) is preset in an exhaust gas control system of a motor vehicle using diesel as a power fuel, and when a DPF needs to be regenerated, a regeneration activation instruction is issued to start a regeneration process. Therefore, in the embodiment of the present invention, the regeneration activation instruction may be used as a condition for starting the determination process, and the regeneration activation instruction is first acquired.
And step S101, counting the starting time of the regeneration process according to the regeneration activation instruction.
After the regeneration process is started, the fuel nozzle in front of the DOC inlet can inject diesel oil into the DOC inlet according to corresponding control logic, and the diesel oil is oxidized and catalyzed in the DOC and then is combusted with automobile tail gas entering the DOC at the same time. Because the temperature at the DOC outlet can rise to a stable degree only in a certain time, the regeneration process needs to be counted in time, so that the stable outlet temperature can be obtained when the DOC outlet temperature is obtained in the subsequent step.
Optionally, a timer may be set, and when the regeneration activation instruction is acquired, the timer is started to start timing.
And step S102, judging whether the starting time of the regeneration process reaches a first preset time, if so, executing step S103, otherwise, returning to execute step S101 and continuing to time.
And judging whether the starting time length of the regeneration process reaches a first preset time length or not according to the timing result. If the starting time of the regeneration process reaches the first preset time, the DOC outlet temperature is stable, and if the starting time of the regeneration process does not reach the first preset time, timing is continued until the starting time of the regeneration process reaches the first preset time.
And step S103, acquiring the current outlet temperature of the DOC.
When the starting time of the regeneration process reaches the first preset time, the temperature at the DOC outlet is already stable, and the current outlet temperature of the DOC can be obtained.
Step S104, judging whether the difference value between the set temperature threshold value and the current outlet temperature is larger than the temperature difference threshold value, if so, executing step S105, and if not, executing step S111.
For any exhaust control system, a corresponding set temperature threshold value is preset, the threshold value can also be used as a standard value of the DOC outlet temperature, and when the DOC is effective and can normally work, after the regeneration process starting duration reaches a first preset duration, the DOC outlet temperature is close to or equal to the set temperature threshold value. Namely, when the difference value between the set temperature threshold and the current outlet temperature is smaller than the temperature difference threshold, the DOC can be judged to work normally.
After obtaining the current outlet temperature of the DOC, calculating a difference value between a preset temperature threshold value and the current outlet temperature of the DOC, if the obtained difference value is greater than a temperature difference threshold value, executing step S105, otherwise, executing step S111.
Step S105, adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold value within a second preset time period, and accumulating the adjusting times.
If the difference value between the set temperature threshold value and the current outlet temperature is larger than the temperature difference threshold value, the set temperature needs to be lowered to the DOC current outlet temperature, the set temperature is adjusted to rise from the current outlet temperature to the set temperature threshold value within a second preset time period, and meanwhile, the adjustment times of the set temperature are accumulated.
It is conceivable that, because the fuel injection quantity of the fuel nozzle in the prior art is in a closed-loop control relationship with the set temperature, in the process that the set temperature rises from the current outlet temperature to the set temperature threshold, the difference between the set temperature and the DOC outlet actual temperature is larger and larger, and based on the closed-loop control principle, because the difference between the input side set temperature and the DOC outlet actual temperature changes from small to large, correspondingly, the fuel injection quantity of the fuel nozzle also changes from small to large, and in the process that the fuel injection quantity changes from small to large, combustion inside the DOC is stronger and stronger, sulfur components and other attachments such as hydrocarbons and the like attached inside the DOC are gradually consumed, so that the outlet temperature of the DOC gradually rises.
Optionally, a counter may be separately provided, the number of times of adjusting the set temperature is counted, and the counted result is used as a subsequent determination condition.
It should be noted that, in the process that the set temperature rises from the current outlet temperature to the set temperature threshold, the actual outlet temperature of the DOC inevitably rises to a certain extent, and therefore, the adjustment time of the set temperature needs to be limited, the adjustment process is controlled to be completed within a second preset time period, and it is ensured that the difference between the set temperature and the actual temperature of the DOC outlet shows a gradually increasing variation trend, so as to realize the process that the fuel injection quantity of the fuel nozzle gradually increases.
Alternatively, the process of raising the set temperature from the current outlet temperature to the set temperature threshold may be implemented in a variety of ways. After the current DOC outlet temperature and a given second preset time duration are obtained, a quotient of a difference value between the set temperature and the current DOC outlet temperature and the second preset time duration can be calculated, namely the quotient is used for dividing the difference value between the set temperature and the current DOC outlet temperature by the second preset time duration, the obtained first quotient is used as a heating rate, and then the set temperature is adjusted to rise from the current outlet temperature to a set temperature threshold value within the second preset time duration according to the obtained heating rate.
Or, a preset step frequency can be given, wherein the preset step frequency represents the number of times of step rising when the set temperature rises from the current extraction temperature of the DOC to the preset temperature threshold value. And calculating a difference value between the set temperature threshold value and the current DOC outlet temperature, and dividing the obtained difference value by the preset step times to obtain a second quotient. And taking the obtained second quotient value as a temperature rise step value, and then adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold value according to the obtained temperature rise step value within a second preset time period.
It should be noted that the embodiment of the present invention is only an exemplary adjustment manner for setting the temperature, and any other manner that can achieve the above object is optional and falls within the protection scope of the present invention.
And step S106, acquiring the adjusted temperature.
After the adjustment process, the temperature of the DOC outlet can be obtained, and the obtained temperature value is used as the adjusted temperature.
It should be noted that, when obtaining the adjusted temperature, the DOC has already passed through a certain time of temperature raising process (including at least the temperature raising within the first preset time period in turn and the second preset time period for which the set temperature is adjusted for the first time), therefore, the adjusted temperature may be obtained immediately after the set temperature adjusting process is finished, and at this time, the temperature at the outlet of the DOC may already be considered to be substantially stable. Of course, it is also possible to wait for a certain time after the adjustment process is finished, so that the temperature at the DOC outlet reaches a steady state, and this way is also optional.
And step S107, updating the current outlet temperature to the adjusted temperature.
And after the adjusted temperature is obtained, updating the current outlet temperature to the adjusted temperature, and performing the operation of the subsequent steps.
Step S108, determining whether the adjustment frequency reaches a preset frequency threshold, if so, executing step S109, and if not, executing step S104.
In actual operation, the determination process cannot be made endless, and therefore, a cutoff condition needs to be given. It is conceivable that, in the application scenario of the present invention, if the DOC has already failed, even if the DOC undergoes a plurality of adjustment processes, the difference between the set temperature threshold and the current DOC tapping temperature is not less than or equal to the temperature difference threshold, and therefore, the number of adjustments may be employed as a condition for determining when to cut off.
And judging whether the adjustment frequency reaches a preset frequency threshold, if so, executing the step S109, and if not, returning to the step S104 to continuously and repeatedly adjust the set temperature so as to gradually consume the sulfur components and other hydrocarbons adhered to the DOC.
Step S109, determining whether the difference between the set temperature threshold and the current outlet temperature is greater than the temperature difference threshold, if so, executing step S110, and if not, executing step S111.
If the adjustment frequency of the set temperature has reached the preset frequency threshold, further determining whether a difference between the set temperature threshold and the current outlet temperature (the current outlet temperature at this time is the DOC outlet temperature corresponding to the last adjustment of the set temperature) is greater than a temperature difference threshold, if the difference is still greater than the temperature difference threshold, executing step S110, otherwise executing step S111.
And step S110, judging that the DOC is invalid.
If the difference value between the set temperature threshold and the current outlet temperature is still greater than the temperature difference threshold after the set temperature is adjusted by the preset frequency threshold (which can also be understood as the gradual heating process of the DOC after the DOC passes through the preset frequency threshold, or the consumption process of sulfur components and hydrocarbons attached to the interior of the DOC), the DOC can be judged to be invalid, cannot be regenerated and recovered, and should be replaced in time.
Optionally, after the DOC is determined to be invalid, designated receiving equipment can be set for relevant personnel, such as drivers, after-sales personnel of manufacturers and customer service personnel, fault prompt information is sent, and the relevant personnel are reminded to replace the DOC in time.
Step S111, determining that the DOC is effective.
According to the foregoing, in the method for determining the failure of the diesel oxidation catalyst provided in the embodiment of the present application, there are two cases in which the DOC can be determined to be valid and still can be used. One is that when the adjustment number is smaller than the preset frequency threshold, for example, at step S104, if the difference between the set temperature threshold and the current outlet temperature is smaller than or equal to the temperature difference threshold, it may be determined that the DOC is valid; secondly, when the adjusting times reach the preset frequency threshold, the difference value between the set temperature threshold and the current outlet temperature is smaller than or equal to the temperature difference threshold, and the DOC can be judged to be valid.
According to the failure judgment method for the oxidation catalyst of the diesel engine, provided by the embodiment of the invention, the fuel injection quantity of the fuel nozzle is repeatedly changed from small to large by repeatedly adjusting the set temperature, and the sulfur component and the hydrocarbon component attached to the interior of the DOC are continuously consumed. If the DOC is also able to recover its effectiveness, the temperature at the DOC outlet will increase with increasing consumption of the sulfur and hydrocarbon components, eventually meeting the aforementioned service requirements. The failure judgment method for the diesel oxidation catalyst provided by the invention can judge whether the DOC fails or not, so that the failed DOC is replaced in time, and the DPF regeneration effect is ensured.
Furthermore, the process of judging whether the DOC is invalid can be regarded as the process of removing sulfur and hydrocarbons from the DOC, so that the DOC can gradually recover the original functions through repeated adjustment processes under the condition that sulfur poisoning or hydrocarbon poisoning is not serious, the service life of the DOC is prolonged, and the product cost is reduced.
Alternatively, one application of the diesel oxidation catalyst failure determination method provided by the present application may be as follows:
referring to fig. 3, fig. 3 is a schematic diagram of a process of adjusting a set temperature by applying the method for determining the failure of the diesel oxidation catalyst according to the embodiment of the present invention, and it can be seen from the diagram that a set temperature threshold is 600 ℃, a preset frequency threshold is 2 times, and a temperature difference threshold is 50 ℃, and meanwhile, a counter is provided to count the number of times of adjusting the set temperature.
Specifically, the regeneration system starts the regeneration process at time t1, and when the first preset time period reaches time t2, the DOC has been heated for a sufficient time, and the outlet temperature has stabilized. The obtained current outlet temperature of the DOC is 400 ℃, and the difference value between the preset temperature threshold and the current outlet temperature is obviously greater than the temperature difference threshold by 50 ℃. At the moment, the set temperature is reduced to 400 ℃ of the current DOC outlet temperature, the set temperature is adjusted from 400 ℃ to 600 ℃ at the calculated heating rate (the calculation process is as described above) within a second preset time period, in the process of adjusting the set temperature, the difference value between the set temperature and the actual temperature of the DOC outlet is gradually increased, the fuel injection quantity of the fuel nozzle is also changed from small to large, so that the combustion in the DOC is gradually strong, and the consumption of sulfur components is gradually increased.
After the first adjustment is completed, the counter counts 1. And meanwhile, acquiring the regulated DOC outlet temperature, specifically 500 ℃, and executing the regulation process again to increase the set temperature from 500 ℃ to 600 ℃, wherein the corresponding temperature difference is still greater than the temperature difference threshold value of 50 ℃. After the adjustment process is finished, the counter accumulates a count of 2.
At this moment, the adjustment frequency reaches a preset frequency threshold value 2, the circulation process is stopped, if the difference value between the set temperature threshold value and the DOC outlet temperature, such as 580 ℃, after the adjustment of the current round is smaller than the temperature difference threshold value, the DOC is judged to still have enough oxidation catalysis after being processed, and the DOC is judged to be effective. On the contrary, if the difference between the set temperature threshold and the DOC outlet temperature after the adjustment of the current round, such as 540 ℃, is still greater than the temperature difference threshold, the oxidation catalytic capability of the DOC cannot be recovered, and the DOC is judged to be invalid.
The following introduces a failure determination device for a diesel oxidation catalyst provided in an embodiment of the present invention, and the failure determination device for a diesel oxidation catalyst described below may be regarded as a functional module architecture that needs to be provided in a central device to implement the failure determination method for a diesel oxidation catalyst provided in an embodiment of the present invention; the following description may be cross-referenced with the above.
Fig. 4 is a block diagram illustrating a failure determination apparatus for a diesel oxidation catalyst according to an embodiment of the present invention, and referring to fig. 4, the apparatus may include:
the first obtaining unit 10 is configured to obtain a current outlet temperature of the diesel oxidation catalyst DOC when a regeneration process starts for a first preset time duration;
the adjustment counting unit 20 is configured to adjust the set temperature to rise from the current outlet temperature to the set temperature threshold within a second preset time period and accumulate adjustment times if a difference between the set temperature threshold and the current outlet temperature is greater than a temperature difference threshold;
a second obtaining unit 30, configured to obtain an adjusted temperature, where the adjusted temperature is an outlet temperature of the DOC after the setting temperature is adjusted;
an update circulation unit 40, configured to update the current outlet temperature to the adjusted temperature, and return to execute the step of adjusting the set temperature to increase from the current outlet temperature to the set temperature threshold within a second preset time period if a difference between the set temperature threshold and the current outlet temperature is greater than a temperature difference threshold, and accumulate the adjustment times until the adjustment times reach a preset frequency threshold;
and the first judging unit 50 is configured to judge that the DOC is invalid if the adjustment frequency reaches the preset frequency threshold, and a difference between the set temperature threshold and the current outlet temperature is greater than the temperature difference threshold.
Optionally, referring to fig. 5, fig. 5 is a block diagram of another diesel oxidation catalyst failure determination apparatus provided in the embodiment of the present invention, where the apparatus may further include, on the basis of the embodiment shown in fig. 4:
a second determining unit 60, configured to determine that the DOC is valid if a difference between the set temperature threshold and the current outlet temperature is less than or equal to the temperature difference threshold before the adjustment time reaches the preset frequency threshold and when the adjustment time reaches the preset frequency threshold.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A method for determining failure of a diesel oxidation catalyst, comprising:
when the regeneration process starts for a first preset time length, acquiring the current outlet temperature of a diesel oxidation catalyst DOC;
if the difference value between the set temperature threshold and the current outlet temperature is larger than the temperature difference threshold, determining the heating rate, adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold at the heating rate within a second preset time period, and accumulating the adjustment times;
obtaining an adjusted temperature, wherein the adjusted temperature is the outlet temperature of the DOC after the set temperature is adjusted;
updating the current outlet temperature to the adjusted temperature, returning to execute the step of determining the heating rate if the difference value between the set temperature threshold and the current outlet temperature is greater than the temperature difference threshold, adjusting the set temperature from the current outlet temperature to the set temperature threshold at the heating rate within a second preset time, and accumulating the adjustment times until the adjustment times reach a preset frequency threshold;
and if the adjusting times reach the preset frequency threshold, judging that the DOC is invalid when the difference value between the set temperature threshold and the current outlet temperature is greater than the temperature difference threshold.
2. The diesel oxidation catalyst failure determination method as set forth in claim 1, further comprising:
and before the adjusting times reach the preset frequency threshold value and when the adjusting times reach the preset frequency threshold value, if the difference value between the set temperature threshold value and the current outlet temperature is less than or equal to the temperature difference threshold value, judging that the DOC is effective.
3. The diesel oxidation catalyst failure determination method as set forth in claim 1, further comprising:
acquiring a regeneration activation instruction;
and counting the starting time of the regeneration process according to the regeneration activation instruction.
4. The diesel oxidation catalyst failure determination method as set forth in claim 1, wherein the determining the temperature increase rate includes:
dividing the difference value between the set temperature threshold and the current outlet temperature by the second preset time length to obtain a first quotient;
and determining the first quotient value as a temperature rising rate.
5. The diesel oxidation catalyst failure determination method as set forth in claim 1, wherein the adjusting the set temperature from the current outlet temperature to the set temperature threshold for a second preset period of time comprises:
determining a temperature rise step value;
and within a second preset time, adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold according to the temperature rise step value.
6. The diesel oxidation catalyst failure determination method as set forth in claim 5, wherein the determining the temperature increase step value includes:
dividing the difference value between the set temperature threshold and the current outlet temperature by a preset step number to obtain a second quotient;
and determining the second quotient value as a temperature rise step value.
7. The diesel oxidation catalyst failure determination method as set forth in any one of claims 1 to 6, further comprising
And sending fault prompt information after the DOC is judged to be invalid.
8. A diesel oxidation catalyst failure determination device, characterized by comprising:
the device comprises a first obtaining unit, a second obtaining unit and a control unit, wherein the first obtaining unit is used for obtaining the current outlet temperature of the diesel oxidation catalyst DOC when the regeneration process starts for a first preset time;
the adjusting counting unit is used for determining the heating rate if the difference value between the set temperature threshold and the current outlet temperature is greater than the temperature difference threshold, adjusting the set temperature to rise from the current outlet temperature to the set temperature threshold at the heating rate within a second preset time length, and accumulating the adjusting times;
the second acquiring unit is used for acquiring the adjusted temperature, wherein the adjusted temperature is the outlet temperature of the DOC after the set temperature is adjusted;
an update circulation unit, configured to update the current outlet temperature to the adjusted temperature, and return to execute the step of determining a temperature rise rate if a difference between a set temperature threshold and the current outlet temperature is greater than a temperature difference threshold, adjusting the set temperature at the temperature rise rate within a second preset duration to rise from the current outlet temperature to the set temperature threshold, and accumulating adjustment times until the adjustment times reach a preset frequency threshold;
and the first judgment unit is used for judging that the DOC is invalid if the difference value between the set temperature threshold and the current outlet temperature is greater than the temperature difference threshold when the adjustment times reach the preset frequency threshold.
9. The diesel oxidation catalyst failure determination device as set forth in claim 8, further comprising:
and the second judgment unit is used for judging that the DOC is effective if the difference value between the set temperature threshold and the current outlet temperature is less than or equal to the temperature difference threshold before the adjustment times reach the preset frequency threshold and when the adjustment times reach the preset frequency threshold.
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| CN110714823B (en) * | 2019-09-24 | 2020-11-20 | 潍柴动力股份有限公司 | DOC sulfur poisoning detection method and device and engine |
| CN113803141B (en) * | 2020-06-11 | 2022-09-09 | 北京福田康明斯发动机有限公司 | DOC sulfur poisoning detection method, storage medium and system |
| CN111706423B (en) * | 2020-06-24 | 2021-05-11 | 东风商用车有限公司 | Test method for diagnosing faults of exhaust gas purification system of diesel engine |
| CN113513421B (en) * | 2021-06-01 | 2023-01-24 | 潍柴动力股份有限公司 | Vehicle thermal management control method, device, equipment, medium and product |
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