US20150361847A1 - Valve assembly - Google Patents
Valve assembly Download PDFInfo
- Publication number
- US20150361847A1 US20150361847A1 US14/303,659 US201414303659A US2015361847A1 US 20150361847 A1 US20150361847 A1 US 20150361847A1 US 201414303659 A US201414303659 A US 201414303659A US 2015361847 A1 US2015361847 A1 US 2015361847A1
- Authority
- US
- United States
- Prior art keywords
- valve
- coolant
- valve assembly
- reductant
- valve element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- 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
-
- 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]
-
- 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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2896—Liquid catalyst carrier
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/20—Cooling circuits not specific to a single part of engine or machine
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
-
- 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
- Y02T10/12—Improving ICE efficiencies
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/6416—With heating or cooling of the system
- Y10T137/6579—Circulating fluid in heat exchange relationship
Definitions
- the present disclosure relates to a valve assembly of an aftertreatment system, and more particularly to a heating system associated with the valve assembly.
- a reductant delivery module associated with an aftertreatment system of an engine may include a tank for storing a reductant, a pump, and reductant delivery lines.
- the reductant delivery lines may fluidly connect various components of the reductant delivery module for a flow of the reductant therethrough.
- the reductant delivery module also includes a valve mounted on a reductant return line from the pump to the reductant tank. On actuation, the valve is configured to allow a predetermined amount of the reductant from the pump to return into the reductant tank.
- the reductant is susceptible to freezing, thereby causing a portion of the reductant present within the valve to freeze and block and/or damage the valve. This may affect an overall working of the valve and performance of the system. Hence, there is a need to provide an improved valve design.
- U.S. Application Publication Number 2013/0000729 describes a fluid supply system configured to be utilized with a coolant system of an engine, the fluid supply system including; a fluid tank, a fluid pump coupled to the fluid tank and a thermal management system in thermal communication with the fluid tank and the fluid pump, wherein the thermal management system includes; a first coolant circuit in thermal communication with the fluid tank and a second coolant circuit in thermal communication with the fluid pump, wherein flow of coolant from the coolant system through the first fluid circuit and second fluid circuit is in parallel when coolant flows through the second fluid circuit.
- a valve assembly for an aftertreatment system includes a coolant conduit.
- the coolant conduit is configured to allow a coolant flow therethrough.
- the valve assembly also includes a valve element having a valve passage.
- the valve element is configured to control a reductant flow through the valve passage.
- the valve assembly further includes a coupling mechanism provided on the valve element. The coupling mechanism is configured to attach the valve element to the coolant conduit such that a temperature of the valve assembly is controlled based on the coolant flow.
- an aftertreatment system in another aspect of the present disclosure, includes a reductant tank.
- the aftertreatment system also includes a pump.
- the aftertreatment system further includes a coolant conduit.
- the coolant conduit is configured to allow a coolant flow therethrough.
- the aftertreatment system includes a valve assembly coupled to the pump and the reductant tank.
- the valve assembly includes a valve element having a valve passage.
- the valve element is configured to control a reductant flow from the pump to the reductant tank.
- the valve assembly also includes a coupling mechanism provided on the valve element. The coupling mechanism is configured to attach the valve element to the coolant conduit such that a temperature of the valve assembly is controlled based on the coolant flow.
- a valve assembly for an aftertreatment system includes a valve element having a valve passage.
- the valve element is configured to control a reductant flow through the valve passage.
- the valve assembly also includes a coolant manifold coupled to the valve element.
- the coolant manifold has an inner passage.
- the inner passage of the coolant manifold is configured to allow a coolant flow therethrough. Further, a temperature of the valve assembly is controlled based on the coolant flow.
- FIG. 1 is a schematic view of an exemplary reductant delivery module of an aftertreatment system associated with an engine
- FIG. 2 is a perspective view of an exemplary valve assembly, according to an embodiment of the present disclosure.
- FIG. 3 is a perspective view of another embodiment of the valve assembly, according to various embodiments of the present disclosure.
- FIG. 1 is a schematic diagram of an exemplary reductant delivery module 100 associated with an aftertreatment system.
- the aftertreatment system may form a part of an engine system.
- the engine system also includes an engine 101 , which may be an internal combustion engine such as, for example, a reciprocating piston engine or a gas turbine engine.
- the engine 101 is a spark ignition engine or a compression ignition engine such as, a diesel engine, a homogeneous charge compression ignition engine, a reactivity controlled compression ignition engine, or other compression ignition engine known in the art.
- the engine 101 may be fueled by gasoline, diesel, biodiesel, dimethyl ether, alcohol, natural gas, propane, hydrogen, combinations thereof, or any other combustion fuel known in the art.
- the engine 101 may include other components such as, a fuel system, an intake system, a drivetrain including a transmission system, and so on.
- the engine 101 may be used to provide power to any machine including, but not limited to, an on-highway truck, an off-highway truck, an earth moving machine, an electric generator, and so on.
- the engine system may be associated with an industry including, but not limited to, transportation, construction, agriculture, forestry, power generation, and material handling.
- the engine system includes the aftertreatment system fluidly connected to an exhaust manifold of the engine 101 .
- the aftertreatment system is configured to treat an exhaust gas flow exiting the exhaust manifold of the engine 101 .
- the exhaust gas flow contains emission compounds that may include Nitrogen Oxides (NOx), unburned hydrocarbons, particulate matter and/or other combustion products known in the art.
- the aftertreatment system may be configured to trap or convert NOx, unburned hydrocarbons, particulate matter, combinations thereof, or other combustion products in the exhaust gas flow before exiting the engine system.
- the reductant delivery module 100 of the aftertreatment system is configured to inject a reductant into the exhaust gas flow.
- the reductant may be a fluid, such as, a Diesel Exhaust Fluid (DEF), and may include urea, ammonia, or other reducing agents known in the art.
- the reductant delivery module 100 includes a reductant tank 102 , a pump 104 , and a reductant injector 106 , and will be explained later in this section.
- the aftertreatment system may further include other components such as a Selective Catalytic Reduction (SCR) module, a Diesel Oxidation Catalyst (DOC) and/or a Diesel Particulate Filter (DPF) not shown in the accompanying drawings.
- SCR Selective Catalytic Reduction
- DOC Diesel Oxidation Catalyst
- DPF Diesel Particulate Filter
- the reductant tank 102 of the reductant delivery module 100 is configured to store the reductant therein. Parameters related to the reductant tank 102 such as size, shape, location, and material used may vary as a function of system design and requirements. As shown in the accompanying figures, the reductant tank 102 is fluidly connected to the pump 104 . The pump 104 is configured to pressurize and selectively deliver the reductant from the reductant tank 102 to the reductant injector 106 via a reductant conduit 107 . The reductant is then introduced by the reductant injector 106 into an exhaust passage 108 of the engine 101 . The pump 104 may receive the reductant from the reductant tank 102 through a reductant conduit 110 .
- the pump 104 may include any pump known in the art including, but not limited to, a piston pump and a centrifugal pump.
- the reductant delivery module 100 illustrated in the accompanying figures includes a single pump and a single reductant injector. However, based on the type of application, the aftertreatment system may include multiple pumps and multiple reductant injectors without deviating from the scope of the present disclosure.
- the amount of the reductant delivered by the pump 104 may exceed a reductant flow demand from the reductant injector 106 .
- the excess amount of the reductant supplied by the pump 104 may be recirculated to the reductant tank 102 via a reductant conduit 112 .
- the reductant conduit 112 fluidly connects the pump 104 with the reductant tank 102 .
- a valve assembly 114 may be provided in the reductant conduit 112 to regulate the reductant flow re-entering the reductant tank 102 from the pump 104 .
- the valve assembly 114 may serve as a pressure regulator while returning the reductant to the reductant tank 102 during operation of the engine 101 .
- FIG. 2 is a perspective view of the valve assembly 114 .
- the valve assembly 114 includes a valve element 202 .
- the illustrated valve element 202 is an electrically controlled diaphragm valve; however alternative embodiments may include configurations wherein the valve element 202 may include other valve mechanisms, such as angle valves, piston valves, ball valves, rotary valves, sliding cylinder valves, etc. Further, while the valve element 202 as illustrated is electronically controlled, one of ordinary skill in the art would appreciate that other methods of controlling the valve, e.g., pneumatically, or hydraulically controlled valves, may alternatively be used.
- the valve element 202 has a valve passage 204 provided therein.
- the reductant not required by the reductant injector 106 may recirculate from the pump 104 to the reductant tank 102 through the valve passage 204 .
- the valve passage 204 defines a centerline A-A.
- the valve passage 204 is embodied as a through-hole provided within the valve element 202 .
- the valve element 202 and more particularly, the valve passage 204 of the valve element 202 may be opened or closed by electrical signals received from an electrical valve actuator 206 associated with the valve assembly 114 .
- the electrical valve actuator 206 is affixed atop the valve element 202 .
- the electrical valve actuator 206 is configured to receive a control signal from a control module 120 (see FIG.
- the control module 120 is communicably coupled to the electrical valve actuator 206 , the pump 104 , and the reductant injector 106 via control lines 122 , 124 , 126 respectively. In a situation wherein the reductant delivered by the pump 104 exceeds the reductant flow demand from the reductant injector 106 , the control module 120 may send a control signal to the electrical valve actuator 206 in order to actuate the valve passage 204 , thereby allowing the reductant to flow therethrough.
- the electrical valve actuator 206 may be a solenoid. Based on the system requirements, the valve element 202 may either operate in a default open position or a default closed position, and further be actuated by the control module 120 as required.
- the valve assembly 114 also includes a pair of connection elements, namely a first connection element 208 and a second connection element 210 .
- the connection elements 208 , 210 are provided on opposing faces of the valve element 202 .
- the reductant may further flow through the valve passage 204 , and leave therefrom through the second connection element 210 .
- the reductant then flows downstream of the valve assembly 114 , and into the reductant tank 102 .
- the connection elements 208 , 210 disclosed herein may be threadably coupled to the valve element 202 , using mechanical couplings.
- connection elements 208 , 210 may be attached to the valve element 202 by welding or brazing.
- each of the connection elements 208 , 210 in the accompanying figures include single port for connecting to the reductant conduit 112 .
- the connection elements 208 , 210 may include an additional port, in order to accommodate other components, such as, an electric pigtail and so on.
- the reductant flowing through various components of the reductant delivery module 100 is susceptible to freezing. Freezing of the reductant may affect an overall performance of the aftertreatment system. Therefore, heating mechanisms are associated with the reductant delivery module 100 in order to increase a temperature of the reductant flowing therethrough.
- a coolant may flow through a coolant system.
- the coolant may be any engine coolant that is configured to cool the engine 101 .
- the coolant flowing through the coolant system is generally at a temperature which is higher than that of the reductant, due to heat transfer between the coolant and various engine parts.
- the coolant system may function as the heating mechanism for the aftertreatment system.
- the coolant is free to flow throughout the coolant system.
- a coolant pump (not shown) may be provided in fluid communication with the coolant system. The coolant pump is configured to pump and deliver the coolant from a source such as a coolant tank to various components of the aftertreatment system.
- valve assembly 114 is also purged.
- the reductant flowing through the valve assembly 114 may be susceptible to freezing. Freezing of the reductant within the valve assembly 114 may lead to a choking of the valve assembly 114 , thereby increasing a quantity of the reductant upstream of the valve element 202 . Unless otherwise prevented, freezing of the reductant may also damage the valve assembly 114 .
- the valve element 202 (see FIG. 2 ) of the valve assembly 114 may be provided with insulation. Provision of the insulation may maintain and/or stop a further reduction in the temperature of the valve element 202 and also the temperature of the reductant flowing therethrough, thereby decreasing the susceptibility of the reductant to freeze within the valve assembly 114 .
- an electrically heated manifold may be attached to or provided near the valve element 202 in order to electrically heat the valve element 202 which in turn may increase the temperature of the reductant.
- the valve element 202 may be designed such that the valve element 202 may be heated electrically. For example, heating coils may be provided surrounding or near the valve element 202 such that on passing an electric current therethrough, the heating coils heat the valve element 202 , thereby increasing the temperature of the reductant flowing therethrough.
- the reductant flowing through the valve assembly 114 may exchange heat with the coolant that flows through the coolant system, such that the heat exchange avoids the freezing of the reductant within the valve assembly 114 .
- the use of the engine coolant as the heating mechanism for the valve assembly 114 has several advantages. First, coolant flow paths already exist in the aftertreatment system for thawing and heating of the reductant, e.g., a coolant flow path through the reductant tank 102 . The routing of an additional flow path to the valve assembly 114 requires minimal additional materials, cost, etc. Further, the heating mechanism of the present disclosure may be easily incorporated within the aftertreatment systems having space constraints. In addition, as opposed to electrical heating, the use of the engine coolant does not require an additional amperage requirement on the engine electrical system.
- the valve assembly 114 includes a coolant manifold 212 .
- the coolant manifold 212 may be provided as a separate component, and later assembled with the valve element 202 . More particularly, the valve element 202 is attached to a top portion of the coolant manifold 212 .
- a coupling mechanism 213 may be provided in association with the valve assembly 114 .
- the coupling mechanism 213 includes a pair of legs. The pair of legs extend from opposite sides of the valve element 202 . In one example, the pair of legs includes an individual leg 214 , 215 that extends from each side of the valve element 202 . Further, the pair of legs 214 , 215 has through-holes provided thereon.
- the through-holes are configured to receive mechanical fasteners 216 , in order to affix the valve element 202 to the coolant manifold 212 .
- the mechanical fasteners 216 may embody bolts, screws, rivets, and the like.
- the valve element 202 may be attached to the coolant manifold 212 using other methods, such as, adhesive, welding, or brazing.
- the coolant manifold 212 includes cross holes drilled therewithin. One of these holes defines an inner passage 218 of the coolant manifold 212 .
- the inner passage 218 of the coolant manifold 212 is configured to receive a coolant conduit 220 . Further, when provided within the inner passage 218 , a centerline B-B defined by the coolant conduit 220 is parallel to the centerline A-A of the valve passage 204 .
- the coolant manifold 212 may include additional ports, for example the port providing connection for coolant conduit 224 .
- the coolant conduit 224 may either allow the coolant flow to enter into or leave the coolant manifold 212 , based on the system design and requirements.
- the coolant conduit 220 disclosed herein is configured to allow the coolant to flow therethrough.
- the coolant conduit 220 may be embodied as a tube or a pipe, such that the coolant conduit 220 is coaxially received into the inner passage 118 .
- the coolant conduit 220 may be connected to other components associated with the engine 101 and the coolant system. It should be noted that parameters associated with the valve assembly design, for example, the distance between the valve passage 204 the inner passage 218 may vary, such that optimum heat exchange takes place between the reductant and the coolant flowing through the valve assembly 114 .
- the coolant may flow through various components of the aftertreatment system.
- the coolant may flow through the reductant tank 102 and the pump 104 .
- the coolant from various components of the system may enter into the valve element 202 via the coolant conduit 220 .
- the coolant may evenly dissipate heat around the valve element 202 , such that the reductant is maintained in the flowing state during the engine operation.
- FIG. 3 illustrates another embodiment of the valve assembly 300 .
- the valve element 302 and the coolant manifold 312 may be formed as a single, unitary, and indivisible component, such that the coolant manifold 312 extends from a lower portion of the valve element 302 .
- a centerline X-X defined by the valve passage 304 is parallel to a centerline Y-Y defined by the inner passage 318 .
- the valve element 302 includes the valve passage 304 for the flow of the reductant therethrough.
- the valve assembly 300 may include the coolant conduit 320 provided within the inner passage 318 .
- the coolant conduit 320 allows the flow of coolant therethrough.
- the valve assembly 114 may be operated in a similar manner as explained above based on signals received from the control module 120 (see FIG. 1 ). Further, the coolant flowing through the coolant manifold 312 may exchange heat with the reductant flowing through the valve element 302 in order to minimize or prevent the freezing of the reductant within the valve element 302 during the operation of the engine 101 .
- Reductant delivery modules include a back flow valve.
- the back flow valve In an open position, the back flow valve recirculates the excess amount of reductant from the pump into the reductant tank.
- the reductant flowing through the back flow valve may be susceptible to freezing. Freezing of the reductant may choke the back flow valve, thereby obstructing reductant flow therethrough. In one situation, the freezing reductant may also damage the back flow valve. Further, the freezing of the reductant may flood the flow passage between the pump and the back flow valve, which is not desirable.
- the present disclosure describes the valve assembly 114 , 300 including the valve element 202 , 302 and the coolant manifold 212 , 312 .
- the coolant conduit 220 , 320 is received within the inner passage 218 , 318 of the coolant manifold 212 , 312 .
- the high temperature coolant is configured to flow through the coolant conduit 220 , 320 or the inner passage 218 , 318 .
- the high temperature coolant exchanges heat with the reductant flowing through the valve passage 204 , 304 , thereby increasing the temperature of the reductant and keeping the reductant thawed all the time.
- the present solution eliminates the freezing of the valve assembly 114 , 300 at low ambient conditions. Further, the system of the present disclosure also eliminates the requirement of additional components for freeze prevention of the valve assembly 114 , 300 .
- the coupling mechanism 213 may provide a compact design in aftertreatment systems having space constraints. Also, as shown in FIG. 2 , the coupling mechanism 213 and the coolant manifold 212 may firmly couple the valve element 202 with the coolant conduit 220 , such that the valve element 202 may be held in place even when experiencing engine vibration.
Landscapes
- Engineering & Computer Science (AREA)
- 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
A valve assembly for an aftertreatment system is disclosed. The valve assembly includes a coolant conduit. The coolant conduit is configured to allow a coolant flow therethrough. The valve assembly also includes a valve element having a valve passage. The valve element is configured to control a reductant flow through the valve passage. The valve assembly further includes a coupling mechanism provided on the valve element. The coupling mechanism is configured to attach the valve element to the coolant conduit such that a temperature of the valve assembly is controlled based on the coolant flow.
Description
- The present disclosure relates to a valve assembly of an aftertreatment system, and more particularly to a heating system associated with the valve assembly.
- A reductant delivery module associated with an aftertreatment system of an engine may include a tank for storing a reductant, a pump, and reductant delivery lines. The reductant delivery lines may fluidly connect various components of the reductant delivery module for a flow of the reductant therethrough. The reductant delivery module also includes a valve mounted on a reductant return line from the pump to the reductant tank. On actuation, the valve is configured to allow a predetermined amount of the reductant from the pump to return into the reductant tank. In certain low temperature environments, the reductant is susceptible to freezing, thereby causing a portion of the reductant present within the valve to freeze and block and/or damage the valve. This may affect an overall working of the valve and performance of the system. Hence, there is a need to provide an improved valve design.
- U.S. Application Publication Number 2013/0000729 describes a fluid supply system configured to be utilized with a coolant system of an engine, the fluid supply system including; a fluid tank, a fluid pump coupled to the fluid tank and a thermal management system in thermal communication with the fluid tank and the fluid pump, wherein the thermal management system includes; a first coolant circuit in thermal communication with the fluid tank and a second coolant circuit in thermal communication with the fluid pump, wherein flow of coolant from the coolant system through the first fluid circuit and second fluid circuit is in parallel when coolant flows through the second fluid circuit.
- In one aspect of the present disclosure, a valve assembly for an aftertreatment system is disclosed. The valve assembly includes a coolant conduit. The coolant conduit is configured to allow a coolant flow therethrough. The valve assembly also includes a valve element having a valve passage. The valve element is configured to control a reductant flow through the valve passage. The valve assembly further includes a coupling mechanism provided on the valve element. The coupling mechanism is configured to attach the valve element to the coolant conduit such that a temperature of the valve assembly is controlled based on the coolant flow.
- In another aspect of the present disclosure, an aftertreatment system is disclosed. The aftertreatment system includes a reductant tank. The aftertreatment system also includes a pump. The aftertreatment system further includes a coolant conduit. The coolant conduit is configured to allow a coolant flow therethrough. The aftertreatment system includes a valve assembly coupled to the pump and the reductant tank. The valve assembly includes a valve element having a valve passage. The valve element is configured to control a reductant flow from the pump to the reductant tank. The valve assembly also includes a coupling mechanism provided on the valve element. The coupling mechanism is configured to attach the valve element to the coolant conduit such that a temperature of the valve assembly is controlled based on the coolant flow.
- In yet another aspect of the present disclosure, a valve assembly for an aftertreatment system is disclosed. The valve assembly includes a valve element having a valve passage. The valve element is configured to control a reductant flow through the valve passage. The valve assembly also includes a coolant manifold coupled to the valve element. The coolant manifold has an inner passage. The inner passage of the coolant manifold is configured to allow a coolant flow therethrough. Further, a temperature of the valve assembly is controlled based on the coolant flow.
- Other features and aspects of this disclosure will be apparent from the following description and the accompanying drawings.
-
FIG. 1 is a schematic view of an exemplary reductant delivery module of an aftertreatment system associated with an engine; -
FIG. 2 is a perspective view of an exemplary valve assembly, according to an embodiment of the present disclosure; and -
FIG. 3 is a perspective view of another embodiment of the valve assembly, according to various embodiments of the present disclosure. - Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or the like parts.
FIG. 1 is a schematic diagram of an exemplaryreductant delivery module 100 associated with an aftertreatment system. The aftertreatment system may form a part of an engine system. The engine system also includes anengine 101, which may be an internal combustion engine such as, for example, a reciprocating piston engine or a gas turbine engine. According to one embodiment of the present disclosure, theengine 101 is a spark ignition engine or a compression ignition engine such as, a diesel engine, a homogeneous charge compression ignition engine, a reactivity controlled compression ignition engine, or other compression ignition engine known in the art. Theengine 101 may be fueled by gasoline, diesel, biodiesel, dimethyl ether, alcohol, natural gas, propane, hydrogen, combinations thereof, or any other combustion fuel known in the art. - The
engine 101 may include other components such as, a fuel system, an intake system, a drivetrain including a transmission system, and so on. Theengine 101 may be used to provide power to any machine including, but not limited to, an on-highway truck, an off-highway truck, an earth moving machine, an electric generator, and so on. Further, the engine system may be associated with an industry including, but not limited to, transportation, construction, agriculture, forestry, power generation, and material handling. - The engine system includes the aftertreatment system fluidly connected to an exhaust manifold of the
engine 101. The aftertreatment system is configured to treat an exhaust gas flow exiting the exhaust manifold of theengine 101. The exhaust gas flow contains emission compounds that may include Nitrogen Oxides (NOx), unburned hydrocarbons, particulate matter and/or other combustion products known in the art. The aftertreatment system may be configured to trap or convert NOx, unburned hydrocarbons, particulate matter, combinations thereof, or other combustion products in the exhaust gas flow before exiting the engine system. - The
reductant delivery module 100 of the aftertreatment system is configured to inject a reductant into the exhaust gas flow. The reductant may be a fluid, such as, a Diesel Exhaust Fluid (DEF), and may include urea, ammonia, or other reducing agents known in the art. Thereductant delivery module 100 includes areductant tank 102, apump 104, and areductant injector 106, and will be explained later in this section. The aftertreatment system may further include other components such as a Selective Catalytic Reduction (SCR) module, a Diesel Oxidation Catalyst (DOC) and/or a Diesel Particulate Filter (DPF) not shown in the accompanying drawings. Variations in design of the aftertreatment system are possible without deviating from the scope of the disclosure and various other configurations not disclosed herein are also possible within the scope of this disclosure. - The
reductant tank 102 of thereductant delivery module 100 is configured to store the reductant therein. Parameters related to thereductant tank 102 such as size, shape, location, and material used may vary as a function of system design and requirements. As shown in the accompanying figures, thereductant tank 102 is fluidly connected to thepump 104. Thepump 104 is configured to pressurize and selectively deliver the reductant from thereductant tank 102 to thereductant injector 106 via areductant conduit 107. The reductant is then introduced by thereductant injector 106 into anexhaust passage 108 of theengine 101. Thepump 104 may receive the reductant from thereductant tank 102 through areductant conduit 110. Thepump 104 may include any pump known in the art including, but not limited to, a piston pump and a centrifugal pump. Thereductant delivery module 100 illustrated in the accompanying figures includes a single pump and a single reductant injector. However, based on the type of application, the aftertreatment system may include multiple pumps and multiple reductant injectors without deviating from the scope of the present disclosure. - Under certain operating conditions the amount of the reductant delivered by the
pump 104 may exceed a reductant flow demand from thereductant injector 106. In such a situation, the excess amount of the reductant supplied by thepump 104 may be recirculated to thereductant tank 102 via areductant conduit 112. Thereductant conduit 112 fluidly connects thepump 104 with thereductant tank 102. Avalve assembly 114 may be provided in thereductant conduit 112 to regulate the reductant flow re-entering thereductant tank 102 from thepump 104. Thevalve assembly 114 may serve as a pressure regulator while returning the reductant to thereductant tank 102 during operation of theengine 101. -
FIG. 2 is a perspective view of thevalve assembly 114. Thevalve assembly 114 includes avalve element 202. The illustratedvalve element 202 is an electrically controlled diaphragm valve; however alternative embodiments may include configurations wherein thevalve element 202 may include other valve mechanisms, such as angle valves, piston valves, ball valves, rotary valves, sliding cylinder valves, etc. Further, while thevalve element 202 as illustrated is electronically controlled, one of ordinary skill in the art would appreciate that other methods of controlling the valve, e.g., pneumatically, or hydraulically controlled valves, may alternatively be used. - The
valve element 202 has avalve passage 204 provided therein. The reductant not required by thereductant injector 106 may recirculate from thepump 104 to thereductant tank 102 through thevalve passage 204. Further, thevalve passage 204 defines a centerline A-A. Thevalve passage 204 is embodied as a through-hole provided within thevalve element 202. Thevalve element 202, and more particularly, thevalve passage 204 of thevalve element 202 may be opened or closed by electrical signals received from anelectrical valve actuator 206 associated with thevalve assembly 114. In the illustrated embodiment, theelectrical valve actuator 206 is affixed atop thevalve element 202. Theelectrical valve actuator 206 is configured to receive a control signal from a control module 120 (seeFIG. 1 ). Thecontrol module 120 is communicably coupled to theelectrical valve actuator 206, thepump 104, and thereductant injector 106 viacontrol lines pump 104 exceeds the reductant flow demand from thereductant injector 106, thecontrol module 120 may send a control signal to theelectrical valve actuator 206 in order to actuate thevalve passage 204, thereby allowing the reductant to flow therethrough. In one example, theelectrical valve actuator 206 may be a solenoid. Based on the system requirements, thevalve element 202 may either operate in a default open position or a default closed position, and further be actuated by thecontrol module 120 as required. - The
valve assembly 114 also includes a pair of connection elements, namely afirst connection element 208 and asecond connection element 210. Theconnection elements valve element 202. When thevalve passage 204 is open, the reductant returning from thepump 104 is introduced into thevalve passage 204 via thefirst connection element 208. The reductant may further flow through thevalve passage 204, and leave therefrom through thesecond connection element 210. The reductant then flows downstream of thevalve assembly 114, and into thereductant tank 102. Theconnection elements valve element 202, using mechanical couplings. Alternatively, theconnection elements valve element 202 by welding or brazing. A person of ordinary skill in the art will appreciate that each of theconnection elements reductant conduit 112. However, in other embodiments, theconnection elements - It should be noted that the reductant flowing through various components of the
reductant delivery module 100, such as, thereductant tank 102 and thepump 104 is susceptible to freezing. Freezing of the reductant may affect an overall performance of the aftertreatment system. Therefore, heating mechanisms are associated with thereductant delivery module 100 in order to increase a temperature of the reductant flowing therethrough. - A coolant may flow through a coolant system. The coolant may be any engine coolant that is configured to cool the
engine 101. The coolant flowing through the coolant system is generally at a temperature which is higher than that of the reductant, due to heat transfer between the coolant and various engine parts. Hence, the coolant system may function as the heating mechanism for the aftertreatment system. In the illustrated embodiment, the coolant is free to flow throughout the coolant system. A coolant pump (not shown) may be provided in fluid communication with the coolant system. The coolant pump is configured to pump and deliver the coolant from a source such as a coolant tank to various components of the aftertreatment system. - Further, after a shutdown of the
engine 101, the various components of the aftertreatment system are purged, so that the reductant present within these components may be removed therefrom. Accordingly, thevalve assembly 114 is also purged. However during an operation of theengine 101, the reductant flowing through thevalve assembly 114 may be susceptible to freezing. Freezing of the reductant within thevalve assembly 114 may lead to a choking of thevalve assembly 114, thereby increasing a quantity of the reductant upstream of thevalve element 202. Unless otherwise prevented, freezing of the reductant may also damage thevalve assembly 114. - In one embodiment, the valve element 202 (see
FIG. 2 ) of thevalve assembly 114 may be provided with insulation. Provision of the insulation may maintain and/or stop a further reduction in the temperature of thevalve element 202 and also the temperature of the reductant flowing therethrough, thereby decreasing the susceptibility of the reductant to freeze within thevalve assembly 114. In another embodiment, an electrically heated manifold may be attached to or provided near thevalve element 202 in order to electrically heat thevalve element 202 which in turn may increase the temperature of the reductant. In yet another embodiment, thevalve element 202 may be designed such that thevalve element 202 may be heated electrically. For example, heating coils may be provided surrounding or near thevalve element 202 such that on passing an electric current therethrough, the heating coils heat thevalve element 202, thereby increasing the temperature of the reductant flowing therethrough. - Referring to the accompanying figures, in other embodiments, the reductant flowing through the
valve assembly 114 may exchange heat with the coolant that flows through the coolant system, such that the heat exchange avoids the freezing of the reductant within thevalve assembly 114. The use of the engine coolant as the heating mechanism for thevalve assembly 114 has several advantages. First, coolant flow paths already exist in the aftertreatment system for thawing and heating of the reductant, e.g., a coolant flow path through thereductant tank 102. The routing of an additional flow path to thevalve assembly 114 requires minimal additional materials, cost, etc. Further, the heating mechanism of the present disclosure may be easily incorporated within the aftertreatment systems having space constraints. In addition, as opposed to electrical heating, the use of the engine coolant does not require an additional amperage requirement on the engine electrical system. - Referring to
FIG. 2 , thevalve assembly 114 includes acoolant manifold 212. Thecoolant manifold 212 may be provided as a separate component, and later assembled with thevalve element 202. More particularly, thevalve element 202 is attached to a top portion of thecoolant manifold 212. Acoupling mechanism 213 may be provided in association with thevalve assembly 114. Thecoupling mechanism 213 includes a pair of legs. The pair of legs extend from opposite sides of thevalve element 202. In one example, the pair of legs includes anindividual leg valve element 202. Further, the pair oflegs mechanical fasteners 216, in order to affix thevalve element 202 to thecoolant manifold 212. Themechanical fasteners 216 may embody bolts, screws, rivets, and the like. Alternatively, thevalve element 202 may be attached to thecoolant manifold 212 using other methods, such as, adhesive, welding, or brazing. - As shown in
FIG. 2 , thecoolant manifold 212 includes cross holes drilled therewithin. One of these holes defines aninner passage 218 of thecoolant manifold 212. In one example, theinner passage 218 of thecoolant manifold 212 is configured to receive acoolant conduit 220. Further, when provided within theinner passage 218, a centerline B-B defined by thecoolant conduit 220 is parallel to the centerline A-A of thevalve passage 204. One of ordinary skill in the art will appreciate that thecoolant manifold 212 may include additional ports, for example the port providing connection forcoolant conduit 224. Thecoolant conduit 224 may either allow the coolant flow to enter into or leave thecoolant manifold 212, based on the system design and requirements. - The
coolant conduit 220 disclosed herein is configured to allow the coolant to flow therethrough. Thecoolant conduit 220 may be embodied as a tube or a pipe, such that thecoolant conduit 220 is coaxially received into the inner passage 118. Thecoolant conduit 220 may be connected to other components associated with theengine 101 and the coolant system. It should be noted that parameters associated with the valve assembly design, for example, the distance between thevalve passage 204 theinner passage 218 may vary, such that optimum heat exchange takes place between the reductant and the coolant flowing through thevalve assembly 114. - The coolant may flow through various components of the aftertreatment system. In one example, the coolant may flow through the
reductant tank 102 and thepump 104. Referring toFIG. 1 , the coolant from various components of the system may enter into thevalve element 202 via thecoolant conduit 220. On passing through thecoolant conduit 220, the coolant may evenly dissipate heat around thevalve element 202, such that the reductant is maintained in the flowing state during the engine operation.FIG. 3 illustrates another embodiment of thevalve assembly 300. In this design, thevalve element 302 and thecoolant manifold 312 may be formed as a single, unitary, and indivisible component, such that thecoolant manifold 312 extends from a lower portion of thevalve element 302. Also, a centerline X-X defined by thevalve passage 304 is parallel to a centerline Y-Y defined by theinner passage 318. Similar to the embodiment explained in connection withFIG. 2 , thevalve element 302 includes thevalve passage 304 for the flow of the reductant therethrough. - The
valve assembly 300 may include thecoolant conduit 320 provided within theinner passage 318. Thecoolant conduit 320 allows the flow of coolant therethrough. Thevalve assembly 114 may be operated in a similar manner as explained above based on signals received from the control module 120 (see FIG. 1). Further, the coolant flowing through thecoolant manifold 312 may exchange heat with the reductant flowing through thevalve element 302 in order to minimize or prevent the freezing of the reductant within thevalve element 302 during the operation of theengine 101. - Reductant delivery modules include a back flow valve. In an open position, the back flow valve recirculates the excess amount of reductant from the pump into the reductant tank. The reductant flowing through the back flow valve may be susceptible to freezing. Freezing of the reductant may choke the back flow valve, thereby obstructing reductant flow therethrough. In one situation, the freezing reductant may also damage the back flow valve. Further, the freezing of the reductant may flood the flow passage between the pump and the back flow valve, which is not desirable.
- The present disclosure describes the
valve assembly valve element coolant manifold coolant conduit inner passage coolant manifold coolant conduit inner passage valve passage - The present solution eliminates the freezing of the
valve assembly valve assembly coupling mechanism 213 may provide a compact design in aftertreatment systems having space constraints. Also, as shown inFIG. 2 , thecoupling mechanism 213 and thecoolant manifold 212 may firmly couple thevalve element 202 with thecoolant conduit 220, such that thevalve element 202 may be held in place even when experiencing engine vibration. - While aspects of the present disclosure have been particularly shown and described with reference to the embodiments above, it will be understood by those skilled in the art that various additional embodiments may be contemplated by the modification of the disclosed machines, systems and methods without departing from the spirit and scope of what is disclosed. Such embodiments should be understood to fall within the scope of the present disclosure as determined based upon the claims and any equivalents thereof.
Claims (20)
1. A valve assembly for an aftertreatment system, the valve assembly comprising:
a coolant conduit configured to allow a coolant flow therethrough;
a valve element having a valve passage, the valve element configured to control a reductant flow through the valve passage; and
a coupling mechanism provided on the valve element, the coupling mechanism configured to attach the valve element to the coolant conduit such that a temperature of the valve assembly is controlled based on the coolant flow.
2. The valve assembly of claim 1 , wherein the coupling mechanism includes at least two legs extending from the valve element.
3. The valve assembly of claim 2 , wherein the at least two legs extend from opposite faces of the valve element.
4. The valve assembly of claim 2 further comprising:
a coolant manifold having an inner passage, the inner passage configured to receive the coolant conduit therein.
5. The valve assembly of claim 4 , wherein the coupling mechanism includes a mechanical fastener configured to attach the at least two legs to the coolant manifold.
6. The valve assembly of claim 1 , wherein the valve element is attached to the coolant conduit such that a centerline of the valve passage is parallel to a centerline of the coolant conduit.
7. The valve assembly of claim 1 further comprising:
a pair of connection elements provided on opposing faces of the valve element, the pair of connection elements configured to attach a reductant line to the valve passage.
8. The valve assembly of claim 1 , wherein the valve assembly is electrically controlled.
9. An aftertreatment system comprising:
a reductant tank;
a pump;
a coolant conduit configured to allow a coolant flow therethrough; and
a valve assembly coupled to the pump and the reductant tank, the valve assembly comprising:
a valve element having a valve passage, the valve element configured to control a reductant flow from the pump to the reductant tank; and
a coupling mechanism provided on the valve element, the coupling mechanism configured to attach the valve element to the coolant conduit such that a temperature of the valve assembly is controlled based on the coolant flow.
10. The aftertreatment system of claim 9 , wherein the coupling mechanism includes at least two legs extending from the valve element.
11. The aftertreatment system of claim 10 , wherein the at least two legs extend from opposite faces of the valve element.
12. The aftertreatment system of claim 10 further comprising:
a coolant manifold having an inner passage, the inner passage configured to receive the coolant conduit therein.
13. The aftertreatment system of claim 12 , wherein the coupling mechanism includes a mechanical fastener configured to attach the at least two legs to the coolant manifold.
14. The aftertreatment system of claim 12 , wherein each of the valve element and the coolant manifold are unitary components.
15. The aftertreatment system of claim 9 , wherein the valve assembly is electrically controlled.
16. A valve assembly for an aftertreatment system, the valve assembly comprising:
a valve element having a valve passage, the valve element configured to control a reductant flow through the valve passage; and
a coolant manifold coupled to the valve element, the coolant manifold having an inner passage, the inner passage configured to allow a coolant flow therethrough,
wherein a temperature of the valve assembly is controlled based on the coolant flow.
17. The valve assembly of claim 16 , wherein the valve assembly is a unitary component.
18. The valve assembly of claim 16 , wherein a centerline of the valve passage is parallel to a centerline of the inner passage.
19. The valve assembly of claim 16 , wherein each of the valve element and the coolant manifold are unitary components.
20. The valve assembly of claim 16 , wherein the valve assembly is electrically controlled.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/303,659 US20150361847A1 (en) | 2014-06-13 | 2014-06-13 | Valve assembly |
CN201520409619.8U CN204716359U (en) | 2014-06-13 | 2015-06-15 | For valve assembly and the after-treatment system of after-treatment system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/303,659 US20150361847A1 (en) | 2014-06-13 | 2014-06-13 | Valve assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
US20150361847A1 true US20150361847A1 (en) | 2015-12-17 |
Family
ID=54315362
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/303,659 Abandoned US20150361847A1 (en) | 2014-06-13 | 2014-06-13 | Valve assembly |
Country Status (2)
Country | Link |
---|---|
US (1) | US20150361847A1 (en) |
CN (1) | CN204716359U (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10648749B2 (en) | 2017-03-03 | 2020-05-12 | Swagelok Company | Fluid system components with thermal conditioning passages |
USD886237S1 (en) | 2018-09-04 | 2020-06-02 | Swagelok Company | Thermal trace valve body |
US20230031074A1 (en) * | 2019-03-14 | 2023-02-02 | Cummins Inc. | Diesel exhaust fluid doser protection during cold ambient temperature conditions using cylinder cutout methods |
-
2014
- 2014-06-13 US US14/303,659 patent/US20150361847A1/en not_active Abandoned
-
2015
- 2015-06-15 CN CN201520409619.8U patent/CN204716359U/en not_active Expired - Fee Related
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10648749B2 (en) | 2017-03-03 | 2020-05-12 | Swagelok Company | Fluid system components with thermal conditioning passages |
US10976118B2 (en) | 2017-03-03 | 2021-04-13 | Swagelok Company | Fluid system components with thermal conditioning passages |
USD886237S1 (en) | 2018-09-04 | 2020-06-02 | Swagelok Company | Thermal trace valve body |
USD895772S1 (en) | 2018-09-04 | 2020-09-08 | Swagelok Company | Thermal trace valve body |
US20230031074A1 (en) * | 2019-03-14 | 2023-02-02 | Cummins Inc. | Diesel exhaust fluid doser protection during cold ambient temperature conditions using cylinder cutout methods |
US11959410B2 (en) * | 2019-03-14 | 2024-04-16 | Cummins Inc. | Diesel exhaust fluid doser protection during cold ambient temperature conditions using cylinder cutout methods |
Also Published As
Publication number | Publication date |
---|---|
CN204716359U (en) | 2015-10-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10082110B2 (en) | Mixer for dedicated exhaust gas recirculation systems | |
US20150023843A1 (en) | Reductant supply system | |
US9163586B2 (en) | Exhaust system having parallel EGR coolers | |
EP2848798B1 (en) | An exhaust gas recirculation cooler mount | |
US20110265459A1 (en) | Reductant dosing manifold | |
US9387437B2 (en) | Reductant supply system | |
US9518519B2 (en) | Transient control of exhaust gas recirculation systems through mixer control valves | |
JP5316349B2 (en) | EGR device | |
US11319860B2 (en) | Systems and methods for equalizing backpressure in engine cylinders | |
US20150361847A1 (en) | Valve assembly | |
US20130061579A1 (en) | Exhaust Gas Aftertreatment System For Engines Equipped With Exhaust Gas Recirculation | |
US20140283798A1 (en) | Exhaust gas recirculation device | |
US10513960B2 (en) | Exhaust purification device for engine | |
US8312863B2 (en) | Fuel delivery system for selectively providing fuel to various engine components | |
US9677444B2 (en) | Reductant supply system | |
US20150322840A1 (en) | Supply system for a medium into an exhaust system | |
US20160376968A1 (en) | Header unit for reductant tank | |
JP2011185244A (en) | Egr device of internal combustion engine | |
JP2018003667A (en) | Cooling device for exhaust emission control system | |
CN108119274B (en) | Fuel supply pump in fuel injection system | |
US20150354425A1 (en) | Heating element for reductant tank | |
AU2013213687B2 (en) | Methods and systems for an engine | |
US20180128140A1 (en) | Urea-water solution heating and cooling devices for construction equipment | |
US10082114B2 (en) | Exhaust gas recirculation system | |
JP6819563B2 (en) | Internal combustion engine system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: CATERPILLAR INC., ILLINOIS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FAHRENKRUG, MATTHEW F.;CASSIDY, THERON J.;HUDGENS, JASON W.;AND OTHERS;SIGNING DATES FROM 20140604 TO 20140606;REEL/FRAME:033095/0011 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |