CN111828148B - System and method for detecting incomplete purge events - Google Patents
System and method for detecting incomplete purge events Download PDFInfo
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- CN111828148B CN111828148B CN201910297870.2A CN201910297870A CN111828148B CN 111828148 B CN111828148 B CN 111828148B CN 201910297870 A CN201910297870 A CN 201910297870A CN 111828148 B CN111828148 B CN 111828148B
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present disclosure relates to systems and methods for detecting incomplete purge events. A system for detecting an incomplete purge event in a vehicle comprising: one or more processors configured by machine-readable instructions to: detecting a vehicle shut-off event; initiating a purge process for a reductant introduction system of a vehicle after detecting a vehicle shut-down event; detecting a vehicle start event; determining whether a purge process of the reductant introduction system is successfully completed; and recording an incomplete purge event after determining that a purge process of reductant introduction into the system has not been successfully completed.
Description
Technical Field
The present disclosure relates to aftertreatment systems for use with Internal Combustion (IC) engines.
Background
An exhaust aftertreatment system is configured to receive and treat exhaust gas produced by the IC engine. Typically, exhaust aftertreatment systems include any of several different components that reduce the level of harmful exhaust emissions present in the exhaust gas. For example, certain exhaust aftertreatment systems for diesel-powered IC engines include Selective Catalytic Reduction (SCR) systemsThe system comprises a catalyst prepared in the presence of ammonia (NH)3) In the case of (1) NOx (in a certain percentage of NO and NO)2) Conversion to harmless nitrogen (N)2) And water vapor (H)2O) is used as the catalyst. Typically in such aftertreatment systems, an exhaust gas reductant, for example, a Diesel Exhaust Fluid (DEF) such as urea, is injected into the SCR system to provide a source of ammonia and mixed with the exhaust gas to partially reduce the NOx gases. The reduced byproducts of the exhaust gas are then fluidly transferred to a catalyst included in the SCR system to decompose substantially all of the NOx gases into relatively harmless byproducts that are exhausted from the aftertreatment system.
Exhaust gas reductants are typically introduced into the SCR system as a source of ammonia to facilitate the reduction of components, such as NOx gases of the exhaust gas (e.g., diesel exhaust gas), by a catalyst contained in the SCR system. A reductant introduction assembly (reducing introduction assembly), which may include a pump, valve, fluid communication line, nozzle, pressure relief valve, bypass valve, and/or other fluid communication device, is often used for controlled introduction of reductant into an aftertreatment system, such as an SCR system of an aftertreatment system. Once the aftertreatment system including such a reductant introduction assembly is shut down, the reductant is typically purged from the reductant introduction assembly, for example, via a pressure relief valve or a bypass valve.
SUMMARY
Embodiments described herein relate generally to systems and methods for detecting an incomplete purge event (incomplete purge event) in a reductant introduction assembly. The reductant introduction assembly and included pump may be pressurized at all times such that the pressure relief mechanism is used to purge reductant after the system is shut down. For the reductant introduction assembly to function properly, a purge event is required in which DEF is returned from the transfer line and pump to the DEF tank once the ignition is turned off. In some embodiments, the system for purging the transfer line and pump requires a continuous supply of power for a period of time (e.g., 30 seconds) after the ignition is turned off.
In one example scenario, an operator of the vehicle may open the battery isolator switch before a sufficient period of time has elapsed for purging the reductant introduction assembly. When a purge event is not successfully completed, DEF may be left in the system, e.g., in the transfer lines and nozzles. The frequent occurrence of incomplete purge events may lead to system problems such as nozzle blockage or transfer line blockage problems. In various embodiments, the systems and methods described herein provide the ability to detect such incomplete purge events and store a count of such incomplete purge events. In some embodiments, the incomplete clear counter is incremented each time the vehicle operator prematurely disconnects the system power.
One aspect of the present disclosure relates to a system for detecting an incomplete purge event in a vehicle. The system includes one or more hardware processors configured by machine-readable instructions. The processor may be configured to detect a vehicle off event. The processor may be configured to initiate a purge process of a reductant introduction system of the vehicle after detecting the vehicle shut-down event. The processor may be configured to detect a vehicle start (vehicle on) event. The processor may be configured to determine whether a purge process of the reductant introduction system was successfully completed. The processor may be configured to record an incomplete purge event after determining that a purge process of the reductant system was not successfully completed.
In some embodiments, determining that the purging process of the reductant introduction system was not successfully completed comprises: the method may include storing a flag in memory prior to initiation of a purge process, retrieving the flag from memory after detection of a vehicle initiation event, and determining that the retrieved flag was not adjusted to indicate completion of the purge process prior to the vehicle initiation event. In some embodiments of the system, recording the incomplete clearing event includes incrementing a counter stored in memory. In some embodiments of the system, the processor may be configured to detect a second vehicle closure event. In some embodiments of the system, the processor may be configured to initiate a second purge process of the reductant introduction system of the vehicle after detecting a second vehicle shut-down event. In some embodiments of the system, the processor may be configured to store the flag in the memory upon initiation of the second purging procedure. In some embodiments of the system, the processor may be configured to detect a second vehicle start event. In some embodiments of the system, the processor may be configured to retrieve the flag from the memory after detecting the second vehicle start event. In some embodiments of the system, the processor may be configured to determine that the retrieved flag has been adjusted prior to the second vehicle start event.
In some embodiments of the system, determining that the retrieved flag may not have been adjusted prior to the vehicle launch event includes detecting a presence of the flag in memory. In some embodiments of the system, determining that the retrieved flag may have been adjusted prior to the second vehicle start event includes detecting that the flag is no longer present in the memory. In some embodiments of the system, initiating the purge process may include activating the source of compressed gas for a predetermined time to provide compressed gas to the reductant injector at a pressure sufficient to force reductant contained in the reductant injector to pass upstream to the reductant introduction assembly via the reductant delivery line. In some embodiments of the system, initiating the purge process may include activating the pump to operate in reverse flow to direct reductant contained in the reductant injector upstream toward the reductant introduction assembly.
Another aspect of the present disclosure relates to a method executed on one or more controllers for detecting an incomplete purge event in a vehicle. The method includes detecting a vehicle shutdown event. The method may include initiating a purge process of a reductant introduction system of the vehicle after detecting a vehicle shut-down event. The method may include detecting a vehicle launch event. The method may include determining whether a purge process of the reductant introduction system was successfully completed. The method may include recording an incomplete purge event after determining that a purge process of the reductant introduction system was not successfully completed.
Yet another aspect of the disclosure relates to a non-transitory computer-readable storage medium containing instructions executable by one or more processors to perform a method for detecting an incomplete purge event in a vehicle. The method may include detecting a vehicle shutdown event. The method may include initiating a purge process of a reductant introduction system of the vehicle after detecting a vehicle shut-down event. The method may include detecting a vehicle launch event. The method may include determining whether a purge process of the reductant introduction system was successfully completed. The method may include recording an incomplete purge event after determining that a purge process of the reductant introduction system was not successfully completed.
It should be appreciated that all combinations of the foregoing concepts and additional concepts discussed in greater detail below (provided that the concepts do not contradict each other) are considered a part of the subject matter disclosed herein. In particular, all combinations of claimed subject matter appearing at the end of this disclosure are contemplated as being part of the subject matter disclosed herein.
The foregoing and other features of the present disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict only several embodiments in accordance with the disclosure and are, therefore, not to be considered limiting of its scope, the disclosure will be described with additional specificity and detail through use of the accompanying drawings.
Drawings
The foregoing and other features of the present disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict only several embodiments in accordance with the disclosure and are, therefore, not to be considered limiting of its scope, the disclosure will be described with additional specificity and detail through use of the accompanying drawings.
Fig. 1 is a schematic block diagram of an aftertreatment system according to an embodiment.
FIG. 2 is a schematic block diagram of another embodiment of a control circuit that may be included in the controller included in the aftertreatment system of FIG. 1.
FIG. 3 is a schematic flow diagram of a method of detecting an un-initiated purge or an incomplete purge associated with a system purge in accordance with an example embodiment.
FIG. 4 is a schematic flow diagram of a method of determining and recording incomplete purge events, according to an example embodiment.
FIG. 5 is a schematic block diagram of an embodiment of a computing device that may be used as a controller included in the aftertreatment system of FIG. 1.
Throughout the following detailed description, reference is made to the accompanying drawings. In the drawings, like numerals generally identify like components, unless context dictates otherwise. The illustrative embodiments described in the detailed description, drawings, and claims are not intended to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are explicitly contemplated and make part of this disclosure.
Detailed Description
The reductant introduction assembly is used to introduce a reductant into an aftertreatment component, such as an SCR system included in an aftertreatment system. Typically, the reductant introduction assembly includes a pump configured to pressurize the reductant to a predetermined operating pressure or another pressure range for introduction into the aftertreatment system. To relieve pressure build up in the pump and thus in the reductant introduction assembly when the reductant introduction assembly is turned off (e.g., a vehicle including the reductant introduction assembly is turned off), the pump or the reductant introduction assembly may include a bypass valve to allow reductant to be purged from the reductant introduction assembly.
In one example of purging the reductant introduction assembly, once the aftertreatment system including the reductant introduction assembly is shut down, pressurized air is introduced into the reductant introduction assembly for a predetermined time to purge reductant from the reductant introduction assembly. The bypass valve may be fluidly coupled to the reductant storage tank via a return line such that the reductant is delivered back to the reductant storage tank. Failure to completely purge the reductant introduction assembly can result in the bypass valve and its associated parts being prone to failure, for example due to the formation of reductant deposits, which increases maintenance frequency and cost.
FIG. 1 is a schematic diagram of an aftertreatment system 100, according to one embodiment. The aftertreatment system 100 is configured to receive exhaust gas (e.g., diesel exhaust) from the engine 10 and then reduce components of the exhaust gas, such as, for example, NOx gases, CO, etc. The aftertreatment system 100 includes a reductant storage tank 110, a reductant introduction system 120, and an SCR system 150.
The reductant storage tank 110 contains an exhaust reductant that is prepared to facilitate the reduction of components of the exhaust (e.g., NOx gases) by a catalyst 154 included in the SCR system 150. In embodiments where the exhaust gas is diesel exhaust, the exhaust gas reductant may comprise a Diesel Exhaust Fluid (DEF) that provides a source of ammonia. Suitable DEF may include urea, an aqueous solution of urea, or any other DEF (e.g., commercially available under the trade name Urea)
DEF of (c). In a particular embodiment, the reducing agent comprises an aqueous urea solution comprising 32.5% urea and 67.5% deionized water. In other embodiments, the reducing agent comprises an aqueous urea solution comprising 40% urea and 60% deionized water, or may comprise any other concentration ratio of urea to deionized water.
While the systems and methods described herein are used to detect an incomplete purge event in reductant introduction assembly 122, it should be recognized that the concepts described herein are equally applicable to any other fluid introduction system used to introduce a fluid within the system. For example, such a system may include a hydrocarbon introduction system for introducing hydrocarbons (e.g., gasoline, diesel, biodiesel, natural gas, ethanol, or any other suitable fuel) into the aftertreatment system for, for example, regenerating components of the aftertreatment system (e.g., an oxidation catalyst included in the aftertreatment system).
The SCR system 150 is configured to receive and treat exhaust gas (e.g., diesel exhaust) flowing through the SCR system 150. The SCR system 150 is operatively coupled to the reductant storage tank 110 to receive reductant therefrom via the reductant introduction system 120, as described herein. The SCR system 150 includes a housing 152, the housing 152 defining an inlet 102 for receiving exhaust gas from the engine 10 and an outlet 104 for discharging treated exhaust gas. Although shown as including a single inlet 102, in various embodiments, the SCR system 150 may include multiple inlets for receiving exhaust gas from the engine 10 (e.g., from an exhaust manifold thereof). In other embodiments, the aftertreatment system 100 may include a plurality of SCR systems 150, each of the plurality of SCR systems 150 configured to receive and treat a portion of the exhaust gas produced by the engine 10. For example, each of the plurality of SCR systems 150 may be dedicated to receiving and treating exhaust gas from a subset of the plurality of engine cylinders of engine 10.
The first sensor 103 may be positioned in the inlet 102. The first sensor 103 may include, for example, a NOx sensor (e.g., a physical or virtual NOx sensor), an oxygen sensor, a particulate matter sensor, a carbon monoxide sensor, a temperature sensor, a pressure sensor, any other sensor, or a combination thereof, configured to measure one or more parameters of the exhaust gas. Further, a second sensor 105 may be positioned in the outlet 104. The second sensor 105 may include, for example, a NOx sensor, a particulate matter sensor, an ammonia oxide (AMOx) sensor, an oxygen sensor, a temperature sensor, a pressure sensor, any other sensor, or a combination thereof.
The SCR system 150 includes at least one catalyst 154 positioned within an interior volume defined by a housing 152. The catalyst 154 is prepared to selectively reduce a component of the exhaust gas, such as NOx gas included in the exhaust gas, in the presence of a reducing agent. Any suitable catalyst 154 may be used, such as, for example, platinum, palladium, rhodium, cerium, iron, manganese, copper, vanadium based catalysts (including combinations thereof).
The catalyst 154 may be disposed on a suitable substrate, such as, for example, a ceramic (e.g., cordierite) or a metallic (e.g., chrome aluminum cobalt refractory steel (kanthal)) monolithic core, which may, for example, define a honeycomb structure. The coating may also serve as a support material for the catalyst 154. Such coating materials may comprise, for example, alumina, titania, silica, any other suitable coating material, or combinations thereof. The exhaust gas may flow over and around the catalyst 154 such that the NOx gases contained in the exhaust gas are further reduced to produce an exhaust gas that is substantially free of carbon monoxide and NOx gases.
The aftertreatment system 100 also includes a reductant injector 140 configured to introduce reductant into the SCR system 150. Reductant injector 140 may include, for example, a metering lance (dosing land), and may be positioned in an exhaust flow path of the exhaust gas flowing through SCR system 150, e.g., positioned to introduce reductant along a centerline of the exhaust flow path. The reductant injector 140 is configured to provide gas-assisted delivery of reductant into the SCR system 150. For example, the reductant injector 140 may be configured to receive reductant from the reductant introduction assembly 122, and to receive compressed gas (e.g., compressed air or recirculated exhaust gas) from a compressed gas source 130 included in the reductant introduction system 120, and to introduce the gas-reductant mixture into the SCR system 150. As shown in FIG. 1, the reductant injector 140 is positioned on a housing 152 of the SCR system 150. In other embodiments, the inlet 102 may comprise a decomposition chamber or tube to allow the reductant to react with the exhaust gas. In such embodiments, the reductant injector 140 may be positioned in the inlet 102 to introduce reductant upstream of the SCR system 150.
For example, the memory 174 includes a pressure determination circuit 174a, a metering control circuit 174b, a pump control circuit 174c, and a purge control circuit 174 d. The pressure determination circuit 174a is configured to receive the output pressure signal, for example, from a pressure sensor, and determine therefrom the operating pressure of the pump 124. In various embodiments, the sensor 176 may be configured to sense an output pressure signal (e.g., current or voltage) and communicate information corresponding to the operating pressure signal to the pressure determination circuit 174 a.
The dosing control circuit 174b is configured to selectively activate the reductant injector 140 to expel reductant therethrough to introduce the reductant into the SCR system 150. The pump control circuit 174c is configured to selectively start or stop the pump 124 pressurizing the reductant for introduction into the SCR system 150.
The purge control circuit 174d is configured to purge the reductant introduction assembly 122. In some embodiments, the controller 170 includes a purge control circuit 174 d. In some implementations, the purge control circuit 174d is configured to purge the reductant injector 140 and/or a connected reductant line (e.g., the reductant line 128). Purging may reduce the likelihood of reductant expansion and freezing, which may deform and/or burst the reductant line, or may damage metering valve 126. In some embodiments, the purging process may include supplying air from an air supply to reductant injector 140 and/or a connected reductant line. In other embodiments, the purging process may include the pump 124 pumping reductant from any reductant line and/or reductant injector 140 into the reductant source.
In some embodiments, purge control circuit 174d is configured to purge reductant from reductant introduction assembly 122, including pump 124, via a reductant delivery line using compressed gas source 130 operatively coupled to reductant injector 140, reductant introduction assembly 122 operatively coupled to metering valve 126. Purge control circuit 174d is configured to activate compressed gas source 130 for a predetermined time to provide compressed gas to reductant injector 140 at a pressure sufficient to force reductant contained in reductant injector 140 upstream to reductant introduction assembly 122 via reductant delivery line 128 when pump 124 is stopped. The compressed gas source 130 may include an air tank configured to store compressed air such that the compressed gas includes compressed air. The compressed gas source 130 may include an exhaust gas recirculation line configured to recirculate at least a portion of the exhaust gas to the reductant injector 140 such that the compressed gas includes the exhaust gas. In some embodiments, the compressed gas source 130 may also include a compressor configured to pressurize a gas (e.g., air or recirculated exhaust gas) to a predetermined gas pressure. Compressed gas source 130 may also include a gas valve 132, with gas valve 132 configured to be selectively opened to allow compressed gas to be provided to reductant injector 140 via gas delivery line 134.
In some embodiments, the purge control circuit 174d is configured to purge reductant from the reductant introduction assembly 122 by using a purge valve (e.g., purge valve 129) located in the reductant delivery line 127. The purge valve 129 may be configured to open in response to the reductant pressure of the reductant exceeding a predetermined pressure threshold.
In some embodiments, the purge control circuit 174d is configured to purge reductant from the reductant introduction assembly 122 by activating the pump 124 in a reverse flow operation. The reverse flow operation applies a negative pressure in the reductant line 128, causing the reductant contained in the reductant injector 140 to be drawn toward the pump 124 at the negative pressure. The reverse flow operation may be for a predetermined number of revolutions, fixed displacement, etc. Operation within the predetermined time may be configured to draw reductant into reductant line 128 a predetermined distance. Other clear control circuit 174d configurations may be used, and the configuration of clear control circuit 174d used as an example should not be taken as limiting the present disclosure.
In some embodiments, the purge control circuitry 174d is configured to perform one or more processes of the method 300. In some embodiments, the purge control circuitry 174d is configured to perform one or more processes of the method 400.
Fig. 3 illustrates a method 300 for detecting an un-initiated purge or an incomplete purge associated with a system purge in accordance with one or more example embodiments. In some implementations, the operations are implemented using one or more processing devices (e.g., a digital processor, an analog processor, a digital circuit designed to process information, an analog circuit designed to process information, a state machine, and/or other mechanisms for electronically processing information). The controller 170 may include one or more processing devices for implementing the operations of the method 300. The operations of method 300 presented below are intended to be illustrative. In some implementations, the method 300 may be accomplished with one or more additional operations not described and/or without one or more of the operations described.
Continuing with operation 302, the purging process may include purging reductant from the reductant introduction assembly 122 by using a purge valve (e.g., purge valve 129) located in the reductant delivery line 127. The purge valve 129 may be configured to open in response to the reductant pressure of the reductant exceeding a predetermined pressure threshold. In some embodiments, the purging process may include purging reductant from reductant introducing component 122 by activating a pump (e.g., pump 124) in a reverse flow operation. The reverse flow operation applies a negative pressure in the reductant line 128, causing the reductant contained in the reductant injector 140 to be drawn toward the pump 124 at the negative pressure. The reverse flow operation may be for a predetermined number of revolutions, fixed displacement, etc. The predetermined time may be set to a time sufficient to draw the reductant a predetermined distance into the reductant line (e.g., reductant line 128).
Fig. 4 illustrates a flow diagram of a method 400 for determining and recording incomplete purge events, according to one or more example embodiments. In some implementations, the operations are implemented using one or more processing devices (e.g., a digital processor, an analog processor, a digital circuit designed to process information, an analog circuit designed to process information, a state machine, and/or other mechanisms for electronically processing information). The controller 170 may include one or more processing devices for implementing the operations of the method 300. The one or more processing devices may include one or more devices that perform some or all of the operations of method 400 in response to instructions electronically stored on an electronic storage medium. The one or more processing devices may include one or more devices configured through hardware, firmware, and/or software to be specifically designed for performing one or more operations of method 400. The operations of method 400 presented below are intended to be illustrative. In some implementations, the method 400 may be accomplished with one or more additional operations not described and/or without one or more of the operations described. Further, the order in which the operations of method 400 are illustrated in fig. 4 and described below is not intended to be limiting.
Continuing with operation 406, the purging process may include purging reductant from the reductant introduction assembly 122 by using a purge valve (e.g., purge valve 129) located in the reductant delivery line 127. The purge valve 129 may be configured to open in response to the reductant pressure of the reductant exceeding a predetermined pressure threshold. In some embodiments, the purging process may include purging reductant from reductant introducing component 122 by activating a pump (e.g., pump 124) in a reverse flow operation. The reverse flow operation applies a negative pressure in the reductant line 128, causing the reductant contained in the reductant injector 140 to be drawn toward the pump 124 at the negative pressure. The reverse flow operation may be for a predetermined number of revolutions, fixed displacement, etc. The predetermined time may be set to a time sufficient to draw reductant into a predetermined distance within the reductant line (e.g., reductant line 128).
In some embodiments, controller 170, or any controller described herein, may be a system computer of a device or system (e.g., a vehicle, an engine, or a generator set, etc.) that includes aftertreatment system 100. For example, FIG. 5 is a block diagram of a computing device 530, according to an illustrative embodiment. Computing device 530 may be used to perform any of the methods or processes described herein, such as methods 300 and/or 400. In some implementations, the controller 170 can include a computing device 530. Computing device 530 includes a bus 532 or other communication means for communicating information. Computing device 530 may also include one or more processors 534 or processing circuits coupled to the bus for processing information.
According to various embodiments, the processes and methods described herein (e.g., the operations of methods 300 and/or 400) may be performed by computing device 530 in response to processor 534 executing an arrangement of instructions contained in main memory 536. Such instructions may be read into main memory 536 from another non-transitory computer-readable medium, such as storage device 540. Execution of the arrangement of instructions contained in main memory 536 causes computing device 530 to perform the illustrative processes described herein. One or more processors in a multi-processing arrangement may also be employed to execute the instructions contained in main memory 536. In alternative embodiments, hard-wired circuitry may be used in place of or in combination with software instructions to implement the illustrative embodiments. Thus, embodiments are not limited to any specific combination of hardware circuitry and software.
Although an exemplary computing device is depicted in FIG. 5, the embodiments described in this specification can be implemented in other types of digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this specification and their structural equivalents, or in combinations of one or more of them.
The embodiments described in this specification can be implemented in digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this specification and their structural equivalents, or in combinations of one or more of them. The embodiments described in this specification can be implemented as one or more computer programs, i.e., one or more modules of computer program instructions, encoded on one or more computer storage media for execution by, or to control the operation of, data processing apparatus. Alternatively or in addition, the program instructions may be encoded on an artificially generated propagated signal (e.g., a machine-generated electrical, optical, or electromagnetic signal) that is generated to encode information for transmission to suitable receiver apparatus for execution by the data processing apparatus. The computer storage medium may be, or be included in, a computer-readable storage device, a computer-readable storage substrate, a random or serial access memory array or device, or a combination of one or more of them. Further, although the computer storage medium is not a propagated signal, the computer storage medium can be a source or destination of computer program instructions encoded in an artificially generated propagated signal. The computer storage medium may also be, or be contained in, one or more separate components or media (e.g., multiple CDs, disks, or other storage devices). Thus, computer storage media are tangible and non-transitory.
The operations described in this specification may be performed by data processing apparatus on data stored on one or more computer-readable storage devices or received from other sources. The term "data processing apparatus" or "computing device" encompasses all types of apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, a system on a chip, or a combination of multiple of the foregoing. An apparatus may comprise special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application-specific integrated circuit). The apparatus can include, in addition to hardware, code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, a cross-platform runtime environment, a virtual machine, or a combination of one or more of them. The apparatus and execution environment may implement a variety of different computing model infrastructures, such as web services, distributed computing and grid computing infrastructures.
A computer program (also known as a program, software application, script, or code) can be written in any form of programming language, including compiled or interpreted languages, declarative or procedural languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, object, or other unit suitable for use in a computing environment. A computer program may, but need not, correspond to a file in a file system. A program can be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document), in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub programs, or portions of code). A computer program can be deployed to be executed on one computer or on multiple computers that are located at one site or distributed across multiple sites and interconnected by a communication network.
Processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer. Generally, a processor will receive instructions and data from a read-only memory or a random access memory or both. The essential elements of a computer are a processor for performing actions in accordance with the instructions and one or more memory devices for storing instructions and data. Generally, a computer will also include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto-optical disks, or optical disks. However, a computer need not have such a device. Devices suitable for storing computer program instructions and data include all forms of non-volatile memory, media and memory devices, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices; magnetic disks, such as internal hard disks or removable disks; magneto-optical disks; and CD-ROM and DVD-ROM disks. The processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry.
It should be noted that the term "example" as used herein to describe various embodiments is intended to indicate that such embodiments are possible examples, representations, and/or illustrations of possible embodiments (and such term is not intended to imply that such embodiments must be specific or best examples).
The term "coupled" and similar terms as used herein mean that two members are directly or indirectly joined to each other. Such joining may be fixed (e.g., permanent) or movable (e.g., removable or releasable). Such a coupling can be achieved in the following cases: two members or two members and any additional intermediate members are integrally formed as a single unitary body with one another or two members and any additional intermediate members are attached to one another.
It is important to note that the construction and arrangement of the various exemplary embodiments are illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. Furthermore, it should be understood that features from one embodiment disclosed herein may be combined with features of other embodiments disclosed herein, as would be understood by one of ordinary skill in the art. Other substitutions, modifications, changes and omissions may also be made in the design, operating conditions and arrangement of the various exemplary embodiments without departing from the scope of the present inventions.
While this specification contains many specific implementation details, these should not be construed as limitations on the scope of any invention or of what may be claimed, but rather as descriptions of features specific to particular implementations of particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.
Various aspects of the disclosure may be implemented in one or more of the following embodiments:
1) a system for detecting an incomplete purge event in a vehicle, the system comprising: one or more processors configured by machine-readable instructions to: detecting a vehicle shut-off event; initiating a purge process of a reductant introduction system of the vehicle after the vehicle shut-down event is detected; detecting a vehicle start event; determining whether a purge process of the reductant introduction system is successfully completed; and recording an incomplete purge event upon determining that a purge process of the reductant introduction system has not been successfully completed.
2) The system for detecting an incomplete purge event in a vehicle of 1), wherein the one or more processors are configured by the machine readable instructions to determine that a purge process of the reductant introduction system was not successfully completed by performing steps comprising: storing a flag in memory before the purge process is initiated; retrieving the flag from memory after detecting the vehicle launch event; and determining that the retrieved flag was not adjusted prior to the vehicle start event to indicate that the purge process is complete.
3) The system for detecting an incomplete clearing event in a vehicle of 1), wherein recording the incomplete clearing event comprises incrementing a counter stored in memory.
4) The system for detecting incomplete clearing events in a vehicle of 2), wherein the one or more processors are further configured by the machine readable instructions to: detecting a second vehicle shut-off event; initiating a second purge process of the reductant introduction system of the vehicle after detecting the second vehicle shut-down event; storing the flag in memory upon initiating the second purge process; detecting a second vehicle start event; retrieving the flag from memory after detecting the second vehicle start event; and determining that the retrieved flag has been adjusted prior to the second vehicle start event.
5) The system for detecting an incomplete clear event in a vehicle of 4), wherein determining that the retrieved flag has not been adjusted prior to the vehicle start event comprises detecting a presence of the flag in the memory, and determining that the retrieved flag has been adjusted prior to the second vehicle start event comprises detecting that the flag is no longer present in the memory.
6) The system for detecting an incomplete purge event in a vehicle of 1), wherein initiating the purge process includes activating a source of compressed gas for a predetermined time to provide compressed gas to a reductant injector at a pressure sufficient to force reductant contained in the reductant injector upstream to a reductant introduction assembly via a reductant delivery line.
7) The system for detecting an incomplete purge event in a vehicle of 1), wherein initiating the purge process includes activating a pump to operate in reverse flow to direct reductant contained in a reductant injector upstream to a reductant introduction assembly.
8) A method executed on one or more controllers of detecting an incomplete purge event in a vehicle, the method comprising: detecting a vehicle shut-off event; initiating a purge process of a reductant introduction system of the vehicle after the vehicle shut-down event is detected; detecting a vehicle start event; determining whether a purge process of the reductant introduction system is successfully completed; and recording an incomplete purge event upon determining that a purge process of the reductant introduction system has not been successfully completed.
9) The method of 8), wherein determining that a purge process of the reductant introduction system was not successfully completed further comprises: storing a flag in a memory when the purge process is initiated; retrieving the flag from memory after detecting the vehicle launch event; and determining that the retrieved flag was not adjusted prior to the vehicle start event to indicate that the purge process is complete.
10) The method of 8), wherein recording the incomplete cleanup event includes incrementing a counter stored in memory.
11) The method of 9), further comprising: detecting a second vehicle shut-off event; initiating a second purge process of the reductant introduction system of the vehicle after detecting the second vehicle shut-down event; storing the flag in memory upon initiating the second purge process; detecting a second vehicle start event; retrieving the flag from memory after detecting the second vehicle start event; and determining that the retrieved flag has been adjusted prior to the second vehicle start event.
12) The method of 11), wherein determining that the retrieved flag was not adjusted prior to the vehicle start event comprises detecting a presence of the flag in the memory, and determining that the retrieved flag was adjusted prior to the second vehicle start event comprises detecting that the flag is no longer present in the memory.
13) The method of 8), wherein initiating the purge process includes activating a source of compressed gas for a predetermined time to provide compressed gas to a reductant injector at a pressure sufficient to force reductant contained in the reductant injector upstream to a reductant introduction assembly via a reductant delivery line.
14) The method of 8), wherein initiating the purging process includes activating a pump to operate in reverse flow to direct reductant contained in a reductant injector upstream toward a reductant introduction assembly.
15) A non-transitory computer-readable storage medium comprising instructions executable by one or more processors to perform steps comprising: detecting a vehicle shut-off event; initiating a purge process of a reductant introduction system of a vehicle after detecting the vehicle shut-down event; detecting a vehicle start event; determining whether a purge process of the reductant introduction system is successfully completed; and recording an incomplete purge event upon determining that a purge process of the reductant introduction system has not been successfully completed.
16) The non-transitory computer-readable storage medium of 15), wherein determining that a purge process of the reductant introduction system was not successfully completed further comprises: storing a flag in a memory when the purge process is initiated; retrieving the flag from memory after detecting the vehicle launch event; and determining that the retrieved flag was not adjusted prior to the vehicle start event to indicate that the purge process is complete.
17) The non-transitory computer-readable storage medium of 15), wherein recording the incomplete purge event comprises incrementing a counter stored in memory.
18) The non-transitory computer readable storage medium of 16), wherein the steps further comprise: detecting a second vehicle shut-off event; initiating a second purge process of the reductant introduction system of the vehicle after detecting the second vehicle shut-down event; storing the flag in memory upon initiating the second purge process; detecting a second vehicle start event; retrieving the flag from memory after detecting the second vehicle start event; and determining that the retrieved flag has been adjusted prior to the second vehicle start event.
19) The non-transitory computer-readable storage medium of 18), wherein determining that the retrieved flag has not been adjusted prior to the vehicle start event comprises detecting a presence of the flag in the memory, and determining that the retrieved flag has been adjusted prior to the second vehicle start event comprises detecting that the flag is no longer present in the memory.
20) The non-transitory computer readable storage medium of 15), wherein initiating the purge process includes activating a source of compressed gas for a predetermined time to provide compressed gas to a reductant injector at a pressure sufficient to force reductant contained in the reductant injector upstream to a reductant introduction assembly via a reductant delivery line.
Claims (20)
1. A system for detecting an incomplete purge event in a vehicle, comprising:
one or more processors configured by machine-readable instructions to:
detecting a vehicle shut-off event;
initiating a purge process of a reductant introduction system of the vehicle after the vehicle shut-down event is detected;
detecting a vehicle start event;
determining whether a purge process of the reductant introduction system is successfully completed; and
upon determining that the purging process of the reductant introduction system is not successfully completed, recording an incomplete purge event.
2. The system for detecting an incomplete purge event in a vehicle of claim 1, wherein the one or more processors are configured by the machine readable instructions to determine that a purge process of the reductant introduction system was not successfully completed by performing steps comprising:
storing a flag in memory before the purge process is initiated;
retrieving the flag from memory after detecting the vehicle launch event; and
determining that the retrieved flag was not adjusted prior to the vehicle launch event to indicate that the purge process is complete.
3. The system for detecting incomplete clearing events in a vehicle of claim 1, wherein recording the incomplete clearing events comprises incrementing a counter stored in memory.
4. The system for detecting incomplete clearing events in a vehicle of claim 2, wherein the one or more processors are further configured by the machine readable instructions to:
detecting a second vehicle shut-off event;
initiating a second purge process of the reductant introduction system of the vehicle after detecting the second vehicle shut-down event;
storing the flag in memory upon initiating the second purge process;
detecting a second vehicle start event;
retrieving the flag from memory after detecting the second vehicle start event; and
determining that the retrieved flag has been adjusted prior to the second vehicle start event.
5. The system for detecting an incomplete clearing event in a vehicle according to claim 4, wherein determining that the retrieved flag has not been adjusted prior to the vehicle start event comprises detecting a presence of the flag in the memory, and determining that the retrieved flag has been adjusted prior to the second vehicle start event comprises detecting that the flag is no longer present in memory.
6. The system for detecting an incomplete purge event in a vehicle of claim 1, wherein initiating the purge process comprises activating a source of compressed gas for a predetermined time to provide compressed gas to a reductant injector at a pressure sufficient to force reductant contained in the reductant injector to pass upstream to a reductant introduction assembly via a reductant delivery line.
7. The system for detecting an incomplete purge event in a vehicle of claim 1, wherein initiating the purge process comprises activating a pump to operate in reverse flow to direct reductant contained in a reductant injector upstream to a reductant introduction assembly.
8. A method executed on one or more controllers of detecting an incomplete purge event in a vehicle, the method comprising:
detecting a vehicle shut-off event;
initiating a purge process of a reductant introduction system of the vehicle after the vehicle shut-down event is detected;
detecting a vehicle start event;
determining whether a purge process of the reductant introduction system is successfully completed; and
upon determining that the purging process of the reductant introduction system is not successfully completed, recording an incomplete purge event.
9. The method of claim 8, wherein determining that a purge process of the reductant introduction system was not successfully completed further comprises:
storing a flag in a memory when the purge process is initiated;
retrieving the flag from memory after detecting the vehicle launch event; and
determining that the retrieved flag was not adjusted prior to the vehicle launch event to indicate that the purge process is complete.
10. The method of claim 8, wherein recording the incomplete purge event comprises incrementing a counter stored in a memory.
11. The method of claim 9, further comprising:
detecting a second vehicle shut-off event;
initiating a second purge process of the reductant introduction system of the vehicle after detecting the second vehicle shut-down event;
storing the flag in memory upon initiating the second purge process;
detecting a second vehicle start event;
retrieving the flag from memory after detecting the second vehicle start event; and
determining that the retrieved flag has been adjusted prior to the second vehicle start event.
12. The method of claim 11, wherein determining that the retrieved flag was not adjusted prior to the vehicle start event comprises detecting a presence of the flag in the memory, and determining that the retrieved flag was adjusted prior to the second vehicle start event comprises detecting that the flag is no longer present in memory.
13. The method of claim 8, wherein initiating the purge process includes activating a source of compressed gas for a predetermined time to provide compressed gas to a reductant injector at a pressure sufficient to force reductant contained in the reductant injector upstream to a reductant introduction assembly via a reductant delivery line.
14. The method of claim 8, wherein initiating the purging process includes activating a pump to operate in reverse flow to direct reductant contained in a reductant injector upstream toward a reductant introduction assembly.
15. A non-transitory computer-readable storage medium comprising instructions executable by one or more processors to perform steps comprising:
detecting a vehicle shut-off event;
initiating a purge process of a reductant introduction system of a vehicle after detecting the vehicle shut-down event;
detecting a vehicle start event;
determining whether a purge process of the reductant introduction system is successfully completed; and
upon determining that the purging process of the reductant introduction system is not successfully completed, recording an incomplete purge event.
16. The non-transitory computer-readable storage medium of claim 15, wherein determining that a purge process of the reductant introduction system was not successfully completed further comprises:
storing a flag in a memory when the purge process is initiated;
retrieving the flag from memory after detecting the vehicle launch event; and
determining that the retrieved flag was not adjusted prior to the vehicle launch event to indicate that the purge process is complete.
17. The non-transitory computer-readable storage medium of claim 15, wherein recording the incomplete purge event comprises incrementing a counter stored in memory.
18. The non-transitory computer readable storage medium of claim 16, wherein the steps further comprise:
detecting a second vehicle shut-off event;
initiating a second purge process of the reductant introduction system of the vehicle after detecting the second vehicle shut-down event;
storing the flag in memory upon initiating the second purge process;
detecting a second vehicle start event;
retrieving the flag from memory after detecting the second vehicle start event; and
determining that the retrieved flag has been adjusted prior to the second vehicle start event.
19. The non-transitory computer-readable storage medium of claim 18, wherein determining that the retrieved flag has not been adjusted prior to the vehicle start event comprises detecting a presence of the flag in the memory, and determining that the retrieved flag has been adjusted prior to the second vehicle start event comprises detecting that the flag is no longer present in memory.
20. The non-transitory computer readable storage medium of claim 15, wherein initiating the purge process includes activating a source of compressed gas for a predetermined time to provide compressed gas to a reductant injector at a pressure sufficient to force reductant contained in the reductant injector upstream to a reductant introduction assembly via a reductant delivery line.
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