WO2016032808A1 - Expanded function exhaust heat exchanger - Google Patents

Expanded function exhaust heat exchanger Download PDF

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Publication number
WO2016032808A1
WO2016032808A1 PCT/US2015/045794 US2015045794W WO2016032808A1 WO 2016032808 A1 WO2016032808 A1 WO 2016032808A1 US 2015045794 W US2015045794 W US 2015045794W WO 2016032808 A1 WO2016032808 A1 WO 2016032808A1
Authority
WO
WIPO (PCT)
Prior art keywords
passage
flow
heat exchanger
exhaust
product according
Prior art date
Application number
PCT/US2015/045794
Other languages
French (fr)
Inventor
John Shutty
Original Assignee
Borgwarner Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Borgwarner Inc. filed Critical Borgwarner Inc.
Publication of WO2016032808A1 publication Critical patent/WO2016032808A1/en

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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
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • F01N2240/02—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 a heat exchanger
    • 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
    • F01N2240/36—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 exhaust flap
    • 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
    • F01N2390/00—Arrangements for controlling or regulating exhaust apparatus
    • F01N2390/06—Arrangements for controlling or regulating exhaust apparatus using pneumatic components only
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • 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
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1406—Exhaust gas pressure
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the field to which the disclosure generally relates includes vehicle exhaust systems.
  • heat exchangers may be used to recover thermal energy from the exhaust of an internal combustion engine for use in other vehicle systems. This may include using the thermal energy recovered from exhaust gases by the heat exchanger, to heat the engine's fluids.
  • a number of variations may include a product with an exhaust system through which exhaust flows.
  • the exhaust system may include a first passage, a second passage that contains a heat exchanger and a device normally closing flow through the heat exchanger.
  • the device may be constructed and arranged to selectively allow flow through the second passage and the heat exchanger while simultaneously closing flow through the first passage.
  • Flow through the heat exchanger may be throttled and optionally, the device may be constructed and arranged so that when closing flow through the first passage, flow is simultaneously throttled in the second passage.
  • Figure 1 is a schematic illustration of a product having a first passage and a second passage that contains a heat exchanger with a device to selectively allow flow through the heat exchanger and simultaneously close flow through the first passage, shown with the first passage open and the second passage closed.
  • Figure 2 is a schematic illustration of a product having a first passage and a second passage that contains a heat exchanger with a device to selectively allow flow through the heat exchanger and simultaneously close flow through the first passage, shown with the first passage closed and the second passage open.
  • Figure 3 is a schematic illustration of a product having a first passage and a second passage that contains a heat exchanger with a device to selectively allow flow through the heat exchanger and simultaneously close flow through the first passage, shown with the first passage open and throttled, and the second passage closed.
  • Figure 4 is an enlarged schematic illustration of the device of Figures 1 -3.
  • Figure 5 is a graph of temperature versus time for the start of a vehicle with flow only through an open unthrottled passage compared with flow only through a heat exchanger/throttled passage.
  • exhaust flow through an exhaust system 10 shown in Figure 1 may be diverted through an exhaust heat recovery system 1 1 and the flow may be further throttled by a device 12.
  • the improved warm up may be accomplished independent of any process that may be separately employed to recover heat through heat transfer as extracted from the exhaust gases by the heat exchanger 14.
  • Exhaust system 10 may also include a heat exchanger 14 in exhaust heat recovery system 1 1 that may be disposed in passage 18.
  • Heat exchanger 14 provides a conduit for conveying a working fluid and which is disposed in the passage 18 such that it may be exposed to exhaust gases so that heat in the gases transfers through the wall of the conduit and to the working fluid.
  • the heat exchanger 14 is in a standby mode.
  • An exhaust heat recovery system may include a device 12 that is constructed and arranged to normally close passage 18 by operation of element 20 which may be a disk shaped element with a profile substantially matching the internal cross section of passage 16.
  • element 20 which may be a disk shaped element with a profile substantially matching the internal cross section of passage 16.
  • a second element 22, which may be included in the device 12 is positioned against the wall 23 of passage 18.
  • the element 22 may be a disk or semi-disk shaped element with a profile that substantially matches at least a portion of the internal cross section of passage 18.
  • the device 12 is operable to close the passage
  • Element 20 may be moved by an actuator such as diaphragm actuator 26, which may include a diaphragm 28 that is exposed to a fluid creating a difference in pressure in chambers 30 and 31 to move the diaphragm and an attached rod 34 that engages element 20.
  • diaphragm actuator 26 which may include a diaphragm 28 that is exposed to a fluid creating a difference in pressure in chambers 30 and 31 to move the diaphragm and an attached rod 34 that engages element 20.
  • Alternatively, other types of actuators such as a rotary actuator may be used to move element 20.
  • element 22 remains against the wall 23 of passage 18 as passage 16 is closed so that the flow if gases through passage 18 is substantially unrestricted by the device 12.
  • the element 22 may be held away from the wall 23 (such as in the position shown in Figure 3), so that a select amount of throttling is always minimally provided, or the element 22 may be fixed in position away from wall 23 providing a fixed amount of throttling.
  • element 22 may be omitted with throttling provided by the heat exchanger 14.
  • the heat exchanger 14 may be designed to inhibit flow a preferred amount and therefore may be used to create a back pressure upstream in the exhaust system.
  • the increased pressure results in an accelerated temperature rise in the vehicle's engine 32 and catalytic converter 33. Accelerating the temperature rise brings the engine up to normal operating temperature more quickly and decreases the amount of time to warm up the catalyst in the catalytic converter. Faster warm up makes the catalyst effective in removing hydrocarbons from the exhaust gases sooner and reduces the amount of emissions during the period following the start of the vehicle's engine.
  • the actuator 26 may move the element 20 to a range of positions beyond that shown in Figure 2.
  • the element 22 may remain in line with the element 20 and pivot into the passage 18 thereby throttling flow a selected amount and increasing the amount of backpressure created upstream in the exhaust system 10. Increasing backpressure results in temperature increases and shorter warm up periods.
  • a bulge 36 may be provided in the exhaust system's pipe 38 matching the outer profile of element 20, or the element 20 may include a flexible portion with the wall of pipe 38 remaining straight. Through this arrangement the passage 18 may be closed more than 50% and even more than 90% when needed for conditions and warm up time.
  • element 22 may be used to close passage 18 so there is no flow through the heat exchanger and element 20 may be used to throttle passage 16.
  • Device 12 is shown enlarged in Figure 4.
  • Elements 20 and 22 have a common pivot 24.
  • Element 22 has a range of movement 35 relative to element 20 from a first position where the two elements are in line as shown in solid line to a second position where element 22 is rotated relative to element 20 as shown in dashed line.
  • Element 22 is biased to the first position by an elastic element 25 that may be stretched as element 22 engages the wall 23 of passage 18 as shown in Figure 1 .
  • elastic element 25 may contract, as allowed by the relative position of the wall of passage 18, to the point of aligning element 22 with element 20.
  • Elastic element 25 may be a spring or other material with an elastic memory, or a coil spring around pivot 24 may be used.
  • Curve 40 depicts the temperature rise at the upstream junction of passages 16 and 18, with flow through passage 18 blocked and flow through passage 16 open. As can be seen a relatively rapid increase in temperature occurs around the 160 second mark. At 80 seconds the exhaust gas temperature is approximately 50 degrees. Curve 41 depicts the
  • accelerated temperature rise may result in a desirable faster warm up of the vehicle's engine and catalytic converter than results from unthrottled flow. Other, more rapid temperature increases may result from additional throttling.
  • Variation 1 may include a product with an exhaust system through which exhaust flows.
  • the exhaust system may have a first passage; a second passage that contains a heat exchanger; and a device normally closing flow through the heat exchanger.
  • the device may be constructed and arranged to selectively allow flow through the second passage and the heat exchanger while simultaneously closing flow through the first passage.
  • the device may be constructed and arranged so that when closing flow through the first passage, flow is simultaneously throttled in the second passage by the device.
  • Variation 2 may include a product according to variation 1 wherein the device throttles flow in the second passage a fixed amount so that flow through the heat exchanger is always throttled.
  • Variation 3 may include a product according to variation 2 wherein the fixed amount results in the second passage being substantially closed.
  • Variation 4 may include a product according to variation 1 wherein when flow through the second passage is throttled, the second passage is at least 50% closed.
  • Variation 5 may include a product according to variation 1 wherein when flow through the second passage is throttled, the second passage is at least 90% closed.
  • Variation 6 may include a product according to any of variations 1 through 5 wherein the heat exchanger includes a conduit through which a working fluid is circulated, wherein the conduit is located in the second passage and wherein flow through the exhaust system must pass through only one of, or only both of, the first and second passages.
  • Variation 7 may include a product according to any of variations 1 through 6 wherein the device is arranged in a position upstream from the heat exchanger.
  • Variation 8 may include a product according to any of variations 1 through 7 wherein the device includes no more than two moving elements.
  • Variation 9 may include a product according to any of variations 1 through 7 wherein the device includes no more than one moving element.
  • Variation 10 may include a product according to variation 1 wherein the device is constructed and arranged to selectively throttle flow through the second passage a variable amount while flow through the first passage remains closed.
  • Variation 1 1 may include a product with an exhaust heat recovery system that selectively throttles flow through an exhaust system.
  • the product may have a first passage; a second passage that contains a heat exchanger; and a device with an actuator.
  • the device may normally close flow through the heat exchanger. By operation of the actuator, flow is selectively allowed through the second passage and the heat exchanger while simultaneously closing flow through the first passage.
  • the device includes a first element constructed and arranged to close flow through the first passage and includes a second element constructed and arranged to throttle flow through the second passage a variable amount.
  • Variation 12 may include a product according to variation 1 1 wherein the device includes an elastic element adapted to bias the second element to a home position substantially in line with the first element.
  • Variation 13 may include a product according to variation 1 1 or 12 wherein when the device is closing flow through the heat exchanger the second element is rotated out of line with the first element.
  • Variation 14 includes a method of accelerating warm up of a vehicle.
  • the vehicle may include an exhaust system with a first passage and second passage.
  • the second passage may include an exhaust heat recovery system with a heat exchanger.
  • the method may include diverting exhaust flow through the heat exchanger; closing exhaust flow through the first passage; and increasing pressure in the exhaust system upstream from the exhaust heat recovery system.
  • Variation 15 may include a method according to variation 14 wherein the exhaust system includes a catalytic converter and including heating the catalytic converter by diverting exhaust flow through the heat exchanger.
  • Variation 16 may include a method according to variation 14 or 15 including the step of throttling exhaust flow through the heat exchanger.
  • Variation 17 may include a method according to variation 15 including the steps of throttling exhaust flow through the heat exchanger; increasing pressure in the catalytic converter; heating the catalytic converter; and burning hydrocarbons in the catalytic converter.
  • Variation 18 may include a method according to any of variations 14 through 17 wherein the exhaust heat recovery system includes an element that is constructed and arranged to throttle exhaust flow using a single actuator and including operating the single actuator to both close exhaust flow through the first passage and throttle exhaust flow through the heat exchanger.
  • Variation 19 may include a method according to any of variations 14 through 18 including throttling exhaust flow through the heat exchanger at least 50%.
  • Variation 20 may include a method according to any of variations 14 through 18 including throttling exhaust flow through the heat exchanger at least 90%.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

An exhaust heat recovery system may provide a select amount of throttling to accelerate the warm up of an associated vehicle.s systems. The vehicle.s exhaust system may include a first passage, a second passage that contains a heat exchanger and a device normally closing flow through the heat exchanger. The device may be constructed and arranged to selectively allow flow through the second passage and the heat exchanger while simultaneously closing flow through the first passage. The device may be constructed and arranged so that when closing flow through the first passage, flow is simultaneously throttled in the second passage.

Description

EXPANDED FUNCTION EXHAUST HEAT EXCHANGER
CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of United States Provisional Application No. 62/042,288 filed August 27, 2014.
TECHNICAL FIELD
The field to which the disclosure generally relates includes vehicle exhaust systems.
BACKGROUND
In vehicle exhaust systems, heat exchangers may be used to recover thermal energy from the exhaust of an internal combustion engine for use in other vehicle systems. This may include using the thermal energy recovered from exhaust gases by the heat exchanger, to heat the engine's fluids.
SUMMARY OF ILLUSTRATIVE VARIATIONS
A number of variations may include a product with an exhaust system through which exhaust flows. The exhaust system may include a first passage, a second passage that contains a heat exchanger and a device normally closing flow through the heat exchanger. The device may be constructed and arranged to selectively allow flow through the second passage and the heat exchanger while simultaneously closing flow through the first passage. Flow through the heat exchanger may be throttled and optionally, the device may be constructed and arranged so that when closing flow through the first passage, flow is simultaneously throttled in the second passage. Other illustrative variations within the scope of the invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while disclosing variations within the scope of the invention, are intended for purposes of illustration only and are not intended to linnit the scope of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Select examples of variations within the scope of the invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
Figure 1 is a schematic illustration of a product having a first passage and a second passage that contains a heat exchanger with a device to selectively allow flow through the heat exchanger and simultaneously close flow through the first passage, shown with the first passage open and the second passage closed.
Figure 2 is a schematic illustration of a product having a first passage and a second passage that contains a heat exchanger with a device to selectively allow flow through the heat exchanger and simultaneously close flow through the first passage, shown with the first passage closed and the second passage open.
Figure 3 is a schematic illustration of a product having a first passage and a second passage that contains a heat exchanger with a device to selectively allow flow through the heat exchanger and simultaneously close flow through the first passage, shown with the first passage open and throttled, and the second passage closed.
Figure 4 is an enlarged schematic illustration of the device of Figures 1 -3.
Figure 5 is a graph of temperature versus time for the start of a vehicle with flow only through an open unthrottled passage compared with flow only through a heat exchanger/throttled passage. DETAILED DESCRIPTION OF ILLUSTRATIVE VARIATIONS
The following description of the variations is merely illustrative in nature and is in no way intended to limit the scope of the invention, its application, or uses. To improve the warm up of a vehicle's systems which may include its engine and catalytic converter, exhaust flow through an exhaust system 10 shown in Figure 1 may be diverted through an exhaust heat recovery system 1 1 and the flow may be further throttled by a device 12. The improved warm up may be accomplished independent of any process that may be separately employed to recover heat through heat transfer as extracted from the exhaust gases by the heat exchanger 14.
Normal flow of exhaust gases through the exhaust system 10 is through passage 16 which presents a substantially unrestricted path. Exhaust system 10 may also include a heat exchanger 14 in exhaust heat recovery system 1 1 that may be disposed in passage 18. Heat exchanger 14 provides a conduit for conveying a working fluid and which is disposed in the passage 18 such that it may be exposed to exhaust gases so that heat in the gases transfers through the wall of the conduit and to the working fluid. When device 12 is in the default position shown in Figure 1 , the heat exchanger 14 is in a standby mode.
An exhaust heat recovery system may include a device 12 that is constructed and arranged to normally close passage 18 by operation of element 20 which may be a disk shaped element with a profile substantially matching the internal cross section of passage 16. With the element 20 in the position of Figure 1 , a second element 22, which may be included in the device 12, is positioned against the wall 23 of passage 18. The element 22 may be a disk or semi-disk shaped element with a profile that substantially matches at least a portion of the internal cross section of passage 18.
Referring to Figure 2, the device 12 is operable to close the passage
16 by rotation of element 20 about pivot 24. Pivot 24 may be formed as part of element 20 or may be connected thereto. Element 20 may be moved by an actuator such as diaphragm actuator 26, which may include a diaphragm 28 that is exposed to a fluid creating a difference in pressure in chambers 30 and 31 to move the diaphragm and an attached rod 34 that engages element 20. Alternatively, other types of actuators such as a rotary actuator may be used to move element 20.
As shown in Figure 2, during the repositioning of element 20, element 22 remains against the wall 23 of passage 18 as passage 16 is closed so that the flow if gases through passage 18 is substantially unrestricted by the device 12. Alternatively, the element 22 may be held away from the wall 23 (such as in the position shown in Figure 3), so that a select amount of throttling is always minimally provided, or the element 22 may be fixed in position away from wall 23 providing a fixed amount of throttling. In some variations element 22 may be omitted with throttling provided by the heat exchanger 14.
With the passage 16 closed and passage 18 open, exhaust gases flow through and past the heat exchanger 14 and out of the exhaust system 10. In this mode of operation for exhaust heat recovery system 1 1 the heat exchanger 14 may be designed to inhibit flow a preferred amount and therefore may be used to create a back pressure upstream in the exhaust system. The increased pressure results in an accelerated temperature rise in the vehicle's engine 32 and catalytic converter 33. Accelerating the temperature rise brings the engine up to normal operating temperature more quickly and decreases the amount of time to warm up the catalyst in the catalytic converter. Faster warm up makes the catalyst effective in removing hydrocarbons from the exhaust gases sooner and reduces the amount of emissions during the period following the start of the vehicle's engine.
As shown in Figure 3, the actuator 26 may move the element 20 to a range of positions beyond that shown in Figure 2. The element 22 may remain in line with the element 20 and pivot into the passage 18 thereby throttling flow a selected amount and increasing the amount of backpressure created upstream in the exhaust system 10. Increasing backpressure results in temperature increases and shorter warm up periods. To enable rotation of the element 20 beyond the point of Figure 2 where the passage 16 is first closed, a bulge 36 may be provided in the exhaust system's pipe 38 matching the outer profile of element 20, or the element 20 may include a flexible portion with the wall of pipe 38 remaining straight. Through this arrangement the passage 18 may be closed more than 50% and even more than 90% when needed for conditions and warm up time. Additionally, the element 22 may be used to close passage 18 so there is no flow through the heat exchanger and element 20 may be used to throttle passage 16. Device 12 is shown enlarged in Figure 4. Elements 20 and 22 have a common pivot 24. Element 22 has a range of movement 35 relative to element 20 from a first position where the two elements are in line as shown in solid line to a second position where element 22 is rotated relative to element 20 as shown in dashed line. Element 22 is biased to the first position by an elastic element 25 that may be stretched as element 22 engages the wall 23 of passage 18 as shown in Figure 1 . When the pivot 24 rotates counterclockwise (in the orientation shown), elastic element 25 may contract, as allowed by the relative position of the wall of passage 18, to the point of aligning element 22 with element 20. Elastic element 25 may be a spring or other material with an elastic memory, or a coil spring around pivot 24 may be used.
Referring to Figure 5, a graph of temperature in degrees Centigrade versus time in seconds for an exhaust system with an exhaust heat recovery system is shown. Curve 40 depicts the temperature rise at the upstream junction of passages 16 and 18, with flow through passage 18 blocked and flow through passage 16 open. As can be seen a relatively rapid increase in temperature occurs around the 160 second mark. At 80 seconds the exhaust gas temperature is approximately 50 degrees. Curve 41 depicts the
temperature rise at the upstream junction of passages 16 and 18, with flow through passage 18 open and flow through passage 16 closed. As can be seen a relatively rapid increase in temperature occurs around the 60 second mark so that at 80 seconds the exhaust gas temperature is above 250 degrees due to restricted flow through the heat exchanger 14. This
accelerated temperature rise may result in a desirable faster warm up of the vehicle's engine and catalytic converter than results from unthrottled flow. Other, more rapid temperature increases may result from additional throttling.
The following description of variants is only illustrative of components, elements, acts, products and methods considered to be within the scope of the invention and is not in any way intended to limit such scope by what is specifically disclosed or not expressly set forth. Components, elements, acts, products and methods may be combined and rearranged other than as expressly described herein and still are considered to be within the scope of the invention. Variation 1 may include a product with an exhaust system through which exhaust flows. The exhaust system may have a first passage; a second passage that contains a heat exchanger; and a device normally closing flow through the heat exchanger. The device may be constructed and arranged to selectively allow flow through the second passage and the heat exchanger while simultaneously closing flow through the first passage. The device may be constructed and arranged so that when closing flow through the first passage, flow is simultaneously throttled in the second passage by the device.
Variation 2 may include a product according to variation 1 wherein the device throttles flow in the second passage a fixed amount so that flow through the heat exchanger is always throttled.
Variation 3 may include a product according to variation 2 wherein the fixed amount results in the second passage being substantially closed.
Variation 4 may include a product according to variation 1 wherein when flow through the second passage is throttled, the second passage is at least 50% closed.
Variation 5 may include a product according to variation 1 wherein when flow through the second passage is throttled, the second passage is at least 90% closed.
Variation 6 may include a product according to any of variations 1 through 5 wherein the heat exchanger includes a conduit through which a working fluid is circulated, wherein the conduit is located in the second passage and wherein flow through the exhaust system must pass through only one of, or only both of, the first and second passages.
Variation 7 may include a product according to any of variations 1 through 6 wherein the device is arranged in a position upstream from the heat exchanger.
Variation 8 may include a product according to any of variations 1 through 7 wherein the device includes no more than two moving elements.
Variation 9 may include a product according to any of variations 1 through 7 wherein the device includes no more than one moving element.
Variation 10 may include a product according to variation 1 wherein the device is constructed and arranged to selectively throttle flow through the second passage a variable amount while flow through the first passage remains closed.
Variation 1 1 may include a product with an exhaust heat recovery system that selectively throttles flow through an exhaust system. The product may have a first passage; a second passage that contains a heat exchanger; and a device with an actuator. The device may normally close flow through the heat exchanger. By operation of the actuator, flow is selectively allowed through the second passage and the heat exchanger while simultaneously closing flow through the first passage. The device includes a first element constructed and arranged to close flow through the first passage and includes a second element constructed and arranged to throttle flow through the second passage a variable amount.
Variation 12 may include a product according to variation 1 1 wherein the device includes an elastic element adapted to bias the second element to a home position substantially in line with the first element.
Variation 13 may include a product according to variation 1 1 or 12 wherein when the device is closing flow through the heat exchanger the second element is rotated out of line with the first element.
Variation 14 includes a method of accelerating warm up of a vehicle. The vehicle may include an exhaust system with a first passage and second passage. The second passage may include an exhaust heat recovery system with a heat exchanger. The method may include diverting exhaust flow through the heat exchanger; closing exhaust flow through the first passage; and increasing pressure in the exhaust system upstream from the exhaust heat recovery system.
Variation 15 may include a method according to variation 14 wherein the exhaust system includes a catalytic converter and including heating the catalytic converter by diverting exhaust flow through the heat exchanger.
Variation 16 may include a method according to variation 14 or 15 including the step of throttling exhaust flow through the heat exchanger.
Variation 17 may include a method according to variation 15 including the steps of throttling exhaust flow through the heat exchanger; increasing pressure in the catalytic converter; heating the catalytic converter; and burning hydrocarbons in the catalytic converter. Variation 18 may include a method according to any of variations 14 through 17 wherein the exhaust heat recovery system includes an element that is constructed and arranged to throttle exhaust flow using a single actuator and including operating the single actuator to both close exhaust flow through the first passage and throttle exhaust flow through the heat exchanger.
Variation 19 may include a method according to any of variations 14 through 18 including throttling exhaust flow through the heat exchanger at least 50%.
Variation 20 may include a method according to any of variations 14 through 18 including throttling exhaust flow through the heat exchanger at least 90%.
The above description of select variations within the scope of the invention is merely illustrative in nature and, thus, variations or variants thereof are not to be regarded as a departure from the spirit and scope of the invention.

Claims

What is claimed is:
A product for use with an exhaust system through which exhaust flows comprising: a first passage; a second passage that contains a heat exchanger; a device normally closing flow through the second passage and the heat exchanger that is constructed and arranged to selectively allow flow through the second passage and the heat exchanger while simultaneously closing flow through the first passage; wherein the device is constructed and arranged so that when closing flow through the first passage flow is simultaneously throttled in the second passage by the device.
A product according to claim 1 wherein the device throttles flow in the second passage a fixed amount.
A product according to claim 2 wherein the fixed amount results in the second passage being substantially closed.
A product according to claim 1 wherein when flow through the second passage is throttled, the second passage is at least 50% closed.
A product according to claim 1 wherein when flow through the second passage is throttled, the second passage is at least 90% closed.
A product according to claim 1 wherein the heat exchanger includes a conduit through which a working fluid is circulated, wherein the conduit is located in the second passage and wherein flow through the exhaust system must pass through only one or only both of the first and second passages.
A product according to claim 1 wherein the device is arranged in a position upstream from the heat exchanger.
8. A product according to claim 1 wherein the device includes no more than two moving elements.
9. A product according to claim 1 wherein the device includes no more than one moving element.
10. A product according to claim 1 wherein the device is constructed and arranged to selectively throttle flow through the second passage a variable amount while flow through the first passage remains closed.
1 1 . An exhaust heat recovery system that selectively throttles flow through an exhaust system comprising: a first passage; a second passage that contains a heat exchanger; and a device with an actuator, the device normally closing flow through the heat exchanger and by operation of the actuator, flow is selectively allowed through the second passage and the heat exchanger while simultaneously closing flow through the first passage; wherein the device includes a first element constructed and arranged to close flow through the first passage and includes a second element constructed and arranged to throttle flow through the second passage a variable amount.
12. An exhaust heat recovery system according to claim 1 1 wherein the device includes a spring element adapted to bias the second element to a position substantially in line with the first element.
13. An exhaust heat recovery system according to claim 1 1 wherein when the device is closing flow through the heat exchanger the second element is rotated out of line with the first element.
14. A method of accelerating warm up of a vehicle where the vehicle includes an exhaust system with a first passage and second passage, the second passage including the steps of an exhaust heat recovery system with a heat exchanger; including diverting exhaust flow through the heat exchanger; closing exhaust flow through the first passage; and increasing pressure in the exhaust system upstream from the exhaust heat recovery system.
15. A method according to claim 14 wherein the exhaust system includes a catalytic converter and including the step of heating the catalytic converter by diverting exhaust flow through the heat exchanger. 16. A method according to claim 14 including the step of throttling exhaust flow through the heat exchanger.
17. A method according to claim 15 including the steps of throttling exhaust flow through the heat exchanger; increasing pressure in the catalytic converter; heating the catalytic converter; and burning hydrocarbons in the catalytic converter.
18. A method according to claim 16 wherein the exhaust heat recovery system includes an element that is constructed and arranged to throttle exhaust flow using a single actuator and including the step of operating the single actuator to both close exhaust flow through the first passage and throttle exhaust flow through the heat exchanger. 19. A method according to claim 18 including throttling exhaust flow through the heat exchanger at least 50%.
A method according to claim 18 including throttling exhaust flow through the heat exchanger at least 90%.
PCT/US2015/045794 2014-08-27 2015-08-19 Expanded function exhaust heat exchanger WO2016032808A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020066998A (en) * 2018-10-22 2020-04-30 フタバ産業株式会社 Exhaust heat recovery unit
US11359534B2 (en) 2017-09-29 2022-06-14 Bosal Emission Control Systems Nv Heat recovery component for an exhaust gas system

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US5836152A (en) * 1995-01-10 1998-11-17 Schatz Thermo Gastech Gmbh Process for reducing the exhaust gas emissions of an internal combustion engine for motor vehicles with catalytic converter
US6141961A (en) * 1998-03-11 2000-11-07 Ecia-Equipments Et Composants Pour L'industrie Automobile Exhaust element with heat exchanger
US20040251012A1 (en) * 2003-01-31 2004-12-16 Bush Phillip David Exhaust gas heat exchanger and bypass assembly
US20120017575A1 (en) * 2010-07-22 2012-01-26 Wescast Industries, Inc. Exhaust Heat Recovery System with Bypass

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5307628A (en) * 1991-06-18 1994-05-03 Institut Francais Du Petrole Exhaust line allowing a faster triggering of the catalyst
US5836152A (en) * 1995-01-10 1998-11-17 Schatz Thermo Gastech Gmbh Process for reducing the exhaust gas emissions of an internal combustion engine for motor vehicles with catalytic converter
US6141961A (en) * 1998-03-11 2000-11-07 Ecia-Equipments Et Composants Pour L'industrie Automobile Exhaust element with heat exchanger
US20040251012A1 (en) * 2003-01-31 2004-12-16 Bush Phillip David Exhaust gas heat exchanger and bypass assembly
US20120017575A1 (en) * 2010-07-22 2012-01-26 Wescast Industries, Inc. Exhaust Heat Recovery System with Bypass

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11359534B2 (en) 2017-09-29 2022-06-14 Bosal Emission Control Systems Nv Heat recovery component for an exhaust gas system
JP2020066998A (en) * 2018-10-22 2020-04-30 フタバ産業株式会社 Exhaust heat recovery unit

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