US20140343747A1 - Smart heater system - Google Patents

Smart heater system Download PDF

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Publication number
US20140343747A1
US20140343747A1 US14/263,177 US201414263177A US2014343747A1 US 20140343747 A1 US20140343747 A1 US 20140343747A1 US 201414263177 A US201414263177 A US 201414263177A US 2014343747 A1 US2014343747 A1 US 2014343747A1
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United States
Prior art keywords
heating system
heater
information
smart heating
smart
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Abandoned
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US14/263,177
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English (en)
Inventor
David P. Culbertson
Magdi Khair
Julian Tan
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Watlow Electric Manufacturing Co
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Watlow Electric Manufacturing Co
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Filing date
Publication date
Application filed by Watlow Electric Manufacturing Co filed Critical Watlow Electric Manufacturing Co
Priority to US14/263,177 priority Critical patent/US20140343747A1/en
Assigned to WATLOW ELECTRIC MANUFACTURING COMPANY reassignment WATLOW ELECTRIC MANUFACTURING COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAN, JULIAN, CULBERTSON, DAVID P, KHAIR, MAGDL KAISER
Publication of US20140343747A1 publication Critical patent/US20140343747A1/en
Assigned to WATLOW ELECTRIC MANUFACTURING COMPANY reassignment WATLOW ELECTRIC MANUFACTURING COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EVERLY, MARK
Priority to US16/786,218 priority patent/US11550346B2/en
Abandoned legal-status Critical Current

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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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B15/00—Systems controlled by a computer
    • G05B15/02—Systems controlled by a computer electric
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H05B1/0236—Industrial applications for vehicles
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/22—Monitoring or diagnosing the deterioration of exhaust systems of electric heaters for exhaust systems or their power supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0408—Methods of control or diagnosing using a feed-back loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1602—Temperature of exhaust gas apparatus
    • 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

Definitions

  • This disclosure relates generally to temperature management. More specifically, this disclosure relates to systems and methods for measuring and compensating for heat transfer differences and other environmental heat transfer related aspects of thermal systems.
  • Heat flux is a useful measure for predicting relative heater element performance, including temperature, transfer efficiency, and life-time.
  • the flux density exhibited by a heater element is defined as Watt density (watts/mm 2 ), which represents a measure of the magnitude of the power that can be concentrated per square millimeter of an element's surface area.
  • a heater element that exhibits a high Watt density will generally provide a fast temperature rise and a lower overall manufacturing cost due to the reduced amount of surface area that is required.
  • these advantages are often off-set by the risk of reduced lifetime due to the higher surface temperatures that are encountered, as well as the potential for lower reliability (e.g., over-shooting the desired temperature condition, etc.).
  • the present invention provides a smart heating system.
  • the smart heating system generally comprises at least one heater element, a set of predetermined or predictable performance information used to control the heating system, and optionally an electronic conditioning module (ECU) capable of storing and processing the performance information.
  • the smart heating system may further comprise at least one temperature sensor.
  • the performance information may be stored as written text, a bar code, a data matrix, or a radio frequency identification (RFID) tag.
  • RFID radio frequency identification
  • the smart heating system heating system may further comprises a LIN or a CAN bus capable of providing a communication pathway between at least two system components.
  • the smart heating system may further comprise at least one support bracket in contact with the at least one heater element and optionally with the at least one temperature sensor.
  • the performance information may include only heater information or a combination of both heater and sensor information.
  • the heater performance information may include the rate of heating that occurs at a desired voltage or under a specified flow condition.
  • the heating system may further comprise a power switch that receives signals from the ECU.
  • the performance information may also include switch information.
  • the power switch can be controlled by a switch control unit that is in communication with the ECU and uses the switch information.
  • the switch information may include a measurement of the current and/or voltage, as well as the rate of heating associated with the solid state components of the switch as a function of the amount of electrical current that is being switched.
  • the smart heating system includes multiple heater elements and temperature sensors, the temperature sensors being a combination of individual sensors or a junction sensor capable of providing more than one temperature measurement.
  • the temperature sensor may be selected as a thermocouple, a thermistor, or a resistance temperature device.
  • the heater element may be selected as a cable heater, a tubular heater, a cartridge heater, a flexible heater, a layered heater, a metal foil, or a metal fleece heater.
  • the smart heating system may be used to compensate for a thermal gradient present in a diesel oxidation catalyst (DOC), diesel particle filter (DPF), selectic catalytic reducer (SCR), lean NOx traps, or another exhaust component that includes an after-treatment catalyst.
  • DOC diesel oxidation catalyst
  • DPF diesel particle filter
  • SCR selectic catalytic reducer
  • lean NOx traps or another exhaust component that includes an after-treatment catalyst.
  • diesel exhaust system may be constructed to comprise the smart heating system as described above and hereafter.
  • a method of providing thermal control in a predetermined application by compensating for a thermal gradient comprises providing a smart heating system and establishing thermal control by creating a desired temperature profile.
  • the desired temperature profile can be created by providing power to all or some of the heater elements in the smart heating system simultaneously or alternatingly. Alternatively, the power may be applied to the heater elements in the smart heating system at either the same level or at different levels.
  • the thermal control may be established by using a closed loop control mechanism or open loop control mechanism.
  • FIG. 1A is a pictorial representation of a smart heating system constructed according to the teachings of the present disclosure
  • FIG. 1B is a pictorial representation of another smart heating system constructed according to the teachings of the present disclosure.
  • FIG. 2 is a pictorial representation of another smart heating system constructed with multiple sensors.
  • FIGS. 3(A-C) are pictorial representation of smart heating systems constructed with a mounting bracket
  • FIGS. 4(A-C) are pictorial representations and cross-sectional views of multiple heater elements used in a smart heating system in a diesel exhaust application;
  • FIG. 5 is a schematic representation of a smart heating system design
  • FIGS. 6(A-B) are schematic representations of other smart heating systems designed to use heater information
  • FIGS. 7(A-B) are schematic representations of other smart heating systems designed to use heater and sensor information.
  • FIGS. 8(A-B) are schematic representations of other smart heating systems designed with power switch control.
  • the present disclosure generally relates to a smart heating system and a method of use associated therewith.
  • the smart heating system made and used according to the teachings contained herein is described throughout the present disclosure in conjunction with diesel exhaust applications in order to more fully illustrate the concept.
  • the incorporation and use of smart heating system in conjunction with other types of thermal management applications is contemplated to be within the scope of the disclosure.
  • a smart heating system general comprises at least one heater element with predetermined (e.g., measured) or predictable performance characteristics.
  • predetermined e.g., measured
  • performance characteristics includes the rate of heating for the heater element when it is exposed to a preselected voltage or under a specified process flow condition.
  • One specific example of a performance characteristic for a heater element that can be used to control a system's overall performance includes, without limitation, the locations associated with any non-uniformity in sheath temperature as shown by the temperature profile exhibited by the heating element under a known or predetermined flow/process condition.
  • a smart heating system provides the benefits of enhanced diagnostic capability in addition to maximizing heat flux and lowering manufacturing cost.
  • a robust diagnostic capability often depends on the variation exhibited from heater element to heater element.
  • a system that is capable of using performance characteristics or information for specific heater elements provides for enhanced diagnostic capability by allowing at least a portion of the random variation that arises from manufacturing variances to be corrected or compensated for.
  • the specific characteristics or information can be stored in any known format that is desirable, including but not limited to written text, bar codes, data matrix, and radio frequency identification (RFID), as well as being communicated on a digital bus or any other information or communication method known to one skilled in the art.
  • RFID radio frequency identification
  • the smart heating system may comprise at least one heater element or alternatively, a combination of at least one heater element and at least one temperature sensor.
  • the sensor may be in contact with the sheath of the heater element (see FIG. 1A ), located on a bracket adjacent to the heater element, or located upstream or downstream of the heater element (see FIG. 1B ).
  • the sensor is capable of measuring the temperature in a specific or desired location of the heater element. The measurement of temperature by the sensor allows the system to reduce power when the heater element is approaching or surpassing a predetermined temperature limit established according to the application being performed.
  • thermocouple 110 can be in contact with or attached to the sheath of the heater element 105 ( FIG. 1A ) or located adjacent to the heater element 105 ( FIG. 1B ).
  • the thermocouple 110 can be in contact with or attached to the sheath of the heater element 105 ( FIG. 1A ) or located adjacent to the heater element 105 ( FIG. 1B ).
  • thermocouple 110 may be in communication with or attached to a signal conditioning module 115 that is capable of storing and/or processing information, such as, without limitation, sensor time response or stability, sensor contact resistance to the heater's sheath, heater's maximum temperature limit, maximum ramp rate for the heater, heater resistance or stability, and the heater's temperature profile or distribution map, as well as the difference in temperature between the heater and the area adjacent to the heater.
  • the maximum temperature limit and the maximum ramp rate may be determined for a specific heater 105 and sensor 110 combination using conventional testing and inspection of the combination.
  • the signal conditioning module 115 may comprise an input and output (I/O), an analog to digital converter (ADC), and a microprocessor, it is possible to use said module to make or communicate other measurements, including but not limited to, the magnitude of current leakage to ground, as well as the voltage and/or current applied to the heater.
  • the measurement of current leakage is useful for determining if the heater insulation resistance (IR) is low and can be used to adjust the rate of applying voltage to the heater in order to remove moisture and/or extend the lifetime of the heater.
  • the measurement of the applied voltage and/or current can be used to determine Power and heat flux associated with the smart heating system 100 , as well as to detect the occurrence of any defects or faults.
  • a signal conditioning module 115 with digital communication capability may alternatively be used.
  • Such digital communication capability may include the use of a local interconnect network (LIN) bus or controller area network (CAN) bus, as well as any other digital bus known to one skilled in the art.
  • the digital bus receives measurements, such as temperature, current leakage, voltage, current, etc. from another device that is in communication with the bus through the use of an integral connector 120 , which in turn allows the signal conditioning unit 115 to become aware of and use this information instead of information that itself had measured.
  • the types of information collected and/or communicated may be utilized to enhance control of the heater system with respect to performance.
  • the information may be used to calculate (a) control parameters to avoid over temperature conditions associated with the heater; (b) a slow ramp for voltage at low current (I)-resistance (R) conditions in order to allow moisture to be evaporated; or (c) a diagnostic limit designed to prolong the lifetime of the heater system.
  • An example of such a diagnostic limit (DL) may include the calculation of the change in temperature ( ⁇ T) per unit time ( ⁇ t) per a predetermined variable (x) as shown in Equation 1. This predetermined variable (x) is selected based upon the specific application in which the smart heating system is being used. In certain applications, this variable (x) may be the applied voltage, the amount of fuel used, or the mass flow of an exhaust, among others.
  • the smart heating system may comprise more than one temperature sensor.
  • a smart heating system 200 having a heater 205 in contact with more than one temperature sensor 210 , alternatively, multiple sensors 210 , alternatively, at least three sensors 210 is shown.
  • the use of multiple sensors 210 allows the smart heating system 200 to measure temperature at several locations of the heater element 205 , thereby, allowing calculation of differences in the measured locations. The calculation of these temperature differences provides for more precise control of the heater element 205 thereby increasing lifetime, as well as avoiding any damage resulting from localized over-heating.
  • thermal gradients will exist in the environment to which the smart heating system is exposed.
  • thermal gradients may exist within a diesel oxidation catalyst (DOC) that can vary as a function of time and/or engine condition.
  • Thermal gradients may also exist in other after treatment components, such as diesel particle filters (DPF), selective catalytic reducers (SCR), or lean NO x traps, among other components present in the exhaust stream that include an after-treatment catalyst.
  • DPF diesel particle filters
  • SCR selective catalytic reducers
  • lean NO x traps lean NO x traps
  • At least part of the function of an after-treatment catalyst is to facilitate a chemical reaction with the exhaust gases in order to reduce pollutants to comply with emission regulations. Since such chemical reactions have a dependency on temperature, a variation or gradient in temperature will affect the rate at which these reactions proceed.
  • the use of a smart heating system 200 can improve the performance of the after-treatment component by effectively controlling the temperature at a level that facilitates the occurrence of the chemical reaction.
  • a smart heating system 200 with multiple sensors 210 is exposed to exhaust gases.
  • the smart heating system 200 can detect variations in temperature caused by thermal flow distribution of the exhaust gases and compensate or adjust accordingly in order to maximize the performance and/or lifetime of the heater element 205 .
  • sensor information includes a measurement of temperature conditions in a location adjacent to the heater element 205 .
  • a similar arrangement with a single sensor is also shown in FIG. 1B .
  • the use of multiple sensors 205 can also be used to measure or predict additional diagnostic conditions when used in various applications.
  • a few examples of which include the measurement of temperature gradients (i) downstream in a diesel particulate filter (DPF) in order to determine non-uniform soot build-up in the DPF; (ii) downstream of a diesel oxidation catalyst (DOC) in order to identify the occurrence of non-uniform oxidation or face-plugging of the DOC; and (iii) upstream of a DOC in order to identify non-uniform temperatures so that more accurate energy balance calculations can be obtained.
  • DPF diesel particulate filter
  • DOC diesel oxidation catalyst
  • upstream of a DOC in order to identify non-uniform temperatures so that more accurate energy balance calculations can be obtained.
  • the smart heating system may further comprise a support bracket.
  • the vibrations arising from the application may be to such a degree that at least one support bracket is necessary to mount the smart heating system.
  • each mounting bracket 330 may be used to support a heating element 305 of the smart heating system 300 .
  • the temperature sensor 310 may also be supported by one of the brackets 330 .
  • each sensor 330 may be in contact with a bracket 330 .
  • a multiple junction sensor 311 may be utilized ( FIGS. 3B & 3C ) with such sensor 311 being in contact with the bracket 305 in multiple locations.
  • a multiple junction sensor 311 provides multiple temperature measurements.
  • the specific multiple junction sensor 311 shown provides for a temperature measurement at the center of the heater can (junction J1) and at four other locations (junctions J2-J5).
  • FIG. 3C a smart heating system 300 is shown with a bracket 330 providing support for a heater element 305 and a multiple junction sensor 311 that provides for temperature measurement at three locations (junctions J1-J3).
  • junctions J1-J3 One skilled in the art will understand that many other different sensors 310 , 311 and bracket 305 combinations may be utilized without exceeding the scope of the present disclosure.
  • a smart heating system 300 that has multiple sensors 310 , 311 measuring temperature commands better performance, lower heater cost, greater reliability and enhanced diagnostic capability than a similar sensor comprising a single sensor 310 .
  • the use of a multiple junction sensor 311 may become a lower cost alternative as compared to the use of multiple individual sensors 310 .
  • the smart heating system 400 may comprise multiple heater elements 405 .
  • multiple circulation heater elements 405 having a U-shaped bend are shown in an exhaust component 411 .
  • multiple circulation heater elements 405 are shown that have a circular shape.
  • Multiple heater elements 405 can be used to create a desired temperature profile. For example, all of the heater elements 405 could be powered at the same time or alternated such that uniform temperature is established in the exhaust/after treatment system 411 in order to facilitate the chemical reaction. Alternatively, some of the heater elements 405 can be fabricated and powered at different levels in order to create a different amount of heat and to modify the thermal gradient that exists within the exhaust or after treatment component 411 .
  • heater elements create different amounts of heat include (a) providing heater elements 405 located on the periphery with a different amount of power than those located in the interior of the exhaust component 411 ; and (b) providing heater elements 405 located in different quadrants with in the exhaust component 411 in order to control thermal gradients on a quadrant by quadrant basis.
  • heater elements 405 may be placed only around the periphery of the exhaust component 411 in order to establish a single heating zone that can be used to reduce or improve radial temperature gradients.
  • the temperature sensors can be thermocouples, thermistors, resistance temperature devices, and any other known means of measuring or detecting temperature.
  • a heater element having a resistance that varies with temperature may be used as a 2-wire heater/sensor combination.
  • the heater element may include without limitation cable heaters, tubular heaters, cartridge heaters, flexible heaters, layered heaters, metal foils, metal fleece heaters, or any other type of heater known to one skilled in the art.
  • the heater element 505 receives power from a switch 550 that can be actuated using signal(s) from the heater control unit 560 .
  • the heater control unit 560 receives information from one or more sensors 510 and/or an electronic control unit 540 . Based on the information, the heater control unit 560 communicates with the power switch 550 and relays the power to the heater element 505 .
  • the power switch 550 relays may be integrated into the heater control unit 540 when desirable.
  • the heater elements 505 are distributed so that they are capable of providing a preferred or desirable temperature profile in the after treatment exhaust system in order to enhance performance of the after treatment system.
  • Enhanced performance with respect to a diesel exhaust system includes without limitation improved NO 2 production by the diesel oxidation catalyst (DOC) or in a catalyzed diesel particulate filter (DPF); improving ammonia storage or NO x conversion SCR, or improving other chemical reactions.
  • DOC diesel oxidation catalyst
  • DPF catalyzed diesel particulate filter
  • the heater may be mounted with the information related to the heater attached to the heater assembly via a barcode, data matrix, RFID tag, or any other known method.
  • Such heater information may include, among others, rating of heating, resistance, maximum voltage as a function of time, etc.
  • the smart heating system 600 may be utilized via an open loop control mechanism 601 .
  • the smart heating system 600 which includes a heater 605 along with its related information 607 , is in communication with an electronic control unit (ECU) 640 .
  • the heater information 607 may be either manually or automatically communicated to the ECU 640 or to a switching device 650 to enable better use of the heater 605 .
  • a similar benefit associated with using the heater information 607 equally applies to a closed loop control mechanism 602 as described in FIG. 6B that incorporates an external temperature sensor 611 .
  • a smart heating system can be utilized that includes information about both the heater and temperature sensor(s).
  • a smart heating system 700 that includes both a heater 705 and sensor 710 combination that is marked with both heater and sensor information 707 as previously described above for a smart heating system 600 that includes only heater information 607 (see FIG. 6 ) or if the sensor is an active sensor with a signal conditioning module (not shown), the information 707 may be stored in the memory of the conditioning module.
  • the heater-sensor information 707 is communicated to an ECU 740 ( FIG. 7A ) or to a power switch 750 ( FIG. 7B ) in order to enhance the utilization of the smart heating system 700 .
  • the smart heating system 700 is shown in FIGS. 7A & 7B to be utilized in a closed loop control mechanism 701 , one skilled in the art will understand that an open loop control mechanism (not shown) may also be utilized as another option.
  • a third option for using heater-sensor information 807 is to communicate this information 807 to another control unit 860 that controls the functionality of the power switch 850 .
  • the switch control 860 may also be in communication with the ECU 840 .
  • the information 808 concerning the switch 850 can be incorporated with the switch control 860 for use along with the heater-sensor information.
  • the switch information 808 may include without limitation, a measurement of the current and/or voltage, as well as the rate of heating associated with the solid state components of the switch 850 as a function of the amount of electrical current that is being switched.
  • the rate of heating associated with the sensor 810 junction in contact with the switch 850 can be determined based on the electrical current (I) and the ability of the switch 850 to dissipate heat away from the junction.
  • I electrical current
  • R resistance
  • the current to temperature relationship of the heater element 805 can be measured and stored as heater information 807 .
  • the smart heater system 800 comprising a heater 805 , sensor 810 , and switch 850 can be used to compare the rate of fluid temperature change to the rate of change in the switch 850 temperature in order to diagnose if the system 600 is operating efficiently.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Control Of Resistance Heating (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Processes For Solid Components From Exhaust (AREA)
US14/263,177 2013-04-26 2014-04-28 Smart heater system Abandoned US20140343747A1 (en)

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US14/263,177 US20140343747A1 (en) 2013-04-26 2014-04-28 Smart heater system
US16/786,218 US11550346B2 (en) 2013-04-26 2020-02-10 Smart heater system

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US201361816346P 2013-04-26 2013-04-26
US14/263,177 US20140343747A1 (en) 2013-04-26 2014-04-28 Smart heater system

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US16/786,218 Continuation US11550346B2 (en) 2013-04-26 2020-02-10 Smart heater system

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US20160113062A1 (en) * 2013-06-14 2016-04-21 Sandvik Kk Molybdenum disilicide-based ceramic heating element holding structure
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US20170273146A1 (en) * 2016-03-02 2017-09-21 Watlow Electric Manufacturing Company Bare heating elements for heating fluid flows
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US20190357311A1 (en) * 2015-10-01 2019-11-21 Watlow Electric Manufacturing Company Integrated device and method for enhancing heater life and performance
US10975746B1 (en) * 2019-12-12 2021-04-13 GM Global Technology Operations LLC Varying closed loop gain control to constrain ramp rate of oxygen sensors in exhaust systems
US10989086B2 (en) * 2017-04-07 2021-04-27 Faurecia Systemes D'echappement Method for purifying the exhaust gases of a vehicle, corresponding purification device
US11111833B2 (en) * 2018-12-13 2021-09-07 Robert Bosch Gmbh Method for heating an exhaust system of a combustion engine of a motor vehicle
US11225892B2 (en) * 2018-10-05 2022-01-18 Faurecia Systemes D'echappement Exhaust gas heating device, in particular for a combustion engine, comprising a grid wherein an electric current runs
US11377992B2 (en) * 2017-01-12 2022-07-05 Volkswagen Aktiengesellschaft Method for regenerating a particle filter
EP4098852A1 (de) * 2021-05-31 2022-12-07 Purem GmbH Abgasheizer
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DE102021210761A1 (de) 2021-09-27 2023-03-30 Vitesco Technologies GmbH Heizleiter zur Aufheizung eines Abgasstroms einer Verbrennungskraftmaschine

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US20160113062A1 (en) * 2013-06-14 2016-04-21 Sandvik Kk Molybdenum disilicide-based ceramic heating element holding structure
US10251217B2 (en) * 2013-06-14 2019-04-02 Sandvik Kk Molybdenum disilicide-based ceramic heating element holding structure
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US10724417B2 (en) * 2016-03-02 2020-07-28 Watlow Electric Manufacturing Company Dual-purpose heater and fluid flow measurement system
US20170254242A1 (en) * 2016-03-02 2017-09-07 Watlow Electric Manufacturing Company Dual-purpose heater and fluid flow measurement system
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FR3077330A1 (fr) * 2018-02-01 2019-08-02 Faurecia Systemes D'echappement Organe de chauffage a manipulation facilitee pour dispositif de purification des gaz d'echappement d'un vehicule
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US10975746B1 (en) * 2019-12-12 2021-04-13 GM Global Technology Operations LLC Varying closed loop gain control to constrain ramp rate of oxygen sensors in exhaust systems
US12037933B2 (en) * 2020-05-27 2024-07-16 Watlow Electric Manufacturing Company Dual-purpose heater and fluid flow measurement system
EP4098852A1 (de) * 2021-05-31 2022-12-07 Purem GmbH Abgasheizer
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US20200174505A1 (en) 2020-06-04
US11550346B2 (en) 2023-01-10
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JP2016526249A (ja) 2016-09-01
CA2908699C (en) 2018-11-13
CN105143621B (zh) 2020-08-07
CA2908699A1 (en) 2014-10-30
JP6454687B2 (ja) 2019-01-16
WO2014176585A1 (en) 2014-10-30

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