WO2006057648A1 - Apparatus and method for controlling exhaust pressure - Google Patents
Apparatus and method for controlling exhaust pressure Download PDFInfo
- Publication number
- WO2006057648A1 WO2006057648A1 PCT/US2005/000474 US2005000474W WO2006057648A1 WO 2006057648 A1 WO2006057648 A1 WO 2006057648A1 US 2005000474 W US2005000474 W US 2005000474W WO 2006057648 A1 WO2006057648 A1 WO 2006057648A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- exhaust
- valve
- actuating
- orifice
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
- F02D9/1065—Mechanical control linkage between an actuator and the flap, e.g. including levers, gears, springs, clutches, limit stops of the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
- F02D9/06—Exhaust brakes
Definitions
- Embodiments of the present invention relate to apparatus and methods for controlling exhaust pressure in an internal combustion engine.
- Engine braking may include exhaust brakes, compression release type engine brakes, bleeder type engine brakes, and/or any combination thereof.
- the general principle underlying such brakes is the utilization of gas compression generated by the reciprocating pistons of an engine to retard the motion of the pistons and thereby help to brake the vehicle to which the engine is connected.
- Exhaust brakes are known to be useful to help brake a vehicle. Exhaust brakes may generate increased exhaust gas back pressure in an exhaust system, including an exhaust manifold, by placing a restriction in the exhaust system downstream of the exhaust
- an exhaust brake By increasing the pressure in the exhaust manifold, an exhaust brake also increases the residual cylinder pressure in the engine cylinders at the end of the exhaust stroke. Increased pressure in the cylinders, in turn, increases the resistance encountered by the pistons on their subsequent up-strokes. Increased resistance for the pistons results in braking the vehicle drive train which may be connected to the pistons through a crank shaft.
- FIG. 1 is a graph illustrating retarding power and back pressure versus engine speed (RPM) for an exhaust brake system having a valve and an orifice. The graph also illustrates an exhaust pressure limit and a targeted retarding power for a particular engine over a range of engine speeds. It is to be understood that Fig. 1 is for exemplary purposes only, and the relative values for retarding power and exhaust back pressure may vary depending on a variety of factors, such as, for example, the specifications of the vehicle engine.
- variable restriction In some known vehicle braking systems, exhaust brakes have been provided with variable restriction. These variable restrictions may be designed such that their operation is dependant on a predetermined back pressure level, not the rated maximum speed. Because the restriction is not dependent on the rated maximum speed, improved braking may occur below this speed.
- Embodiments of the present invention may provide apparatus and methods for controlling exhaust pressure in an internal combustion engine. Some embodiments of the present invention may provide controlled exhaust gas back pressure to optimize one or more engine valve events, such as, for example, engine braking. Some embodiments of the present invention may control exhaust gas back pressure independent of the effect of dynamic pressure on means for controlling the exhaust pressure. Advantages of embodiments of the invention are set forth, in part, in the description which follows and, in part, will be apparent to one of ordinary skill in the art from the description and/or from the practice of the invention.
- Applicant has developed innovative apparatus and methods for controlling exhaust pressure in an internal combustion engine.
- a valve disposed downstream of the exhaust manifold, means for controlling pressure in the exhaust manifold, and means for actuating the pressure control means
- one embodiment of the method of the present invention may comprise the steps of: closing the valve; generating exhaust pressure in the exhaust manifold; applying a force to the actuating means substantially independent of the effect of pressure acting on the pressure control means; actuating the pressure control means; and controlling the level of exhaust pressure in the exhaust manifold.
- Applicant has further developed a method of controlling exhaust pressure in an engine having an exhaust manifold, a valve disposed downstream of the exhaust manifold,
- Applicant has further developed an apparatus for controlling exhaust pressure in an internal combustion engine having an exhaust manifold, comprising: a valve disposed in the exhaust manifold, the valve adapted to rotate about an axis of rotation; a bore formed in the valve coaxial with the axis of rotation; means for controlling pressure in the exhaust manifold, the pressure control means disposed in the valve bore; and means for actuating the pressure control means.
- Applicant has developed an apparatus for controlling exhaust pressure in an internal combustion engine having an exhaust manifold, comprising: a valve disposed in the exhaust manifold; means for controlling pressure in the exhaust manifold, the pressure control means disposed in the valve; and means for actuating the pressure control means, wherein exhaust pressure acting on the actuating means provides substantially all of the force required to actuate the pressure control means.
- Applicant has developed an apparatus for controlling exhaust pressure in an internal combustion engine, comprising: a housing; a valve disposed in the housing; an orifice formed in the valve, wherein the orifice defines a gas flowpath through the valve; a shaft slidably disposed in a bore formed in the valve, the shaft movable between a first position, in which gas is substantially prevented from flowing through the orifice, and a second position in which gas is permitted to flow through the orifice; and means for actuating the shaft.
- Fig. 1 is a graph illustrating retarding power and exhaust pressure as a function of engine speed for an exemplary exhaust brake system.
- Fig. 2 is a schematic sectional view of an engine cylinder, exhaust system, and exhaust pressure control system according to an embodiment of the present invention.
- Fig. 3 is a schematic sectional view of an exhaust pressure control system according to a first embodiment of the present invention.
- Fig. 4 is a schematic sectional view of the system shown in Fig. 3 with a pneumatic valve actuator.
- Fig. 5 is a top sectional view of the system shown in Fig. 3 illustrating a shaft configuration within a valve bore.
- Fig. 6 is a schematic sectional view of an exhaust pressure control system
- Fig. 7 is a schematic sectional view of an exhaust pressure control system according to a third embodiment of the present invention.
- Fig.8 is an enlarged schematic sectional view of a hinge pin assembly according to an embodiment of the present invention.
- FIG. 9 is a schematic sectional view of an exhaust pressure control system according to a fourth embodiment of the present invention.
- Fig. 10 is a schematic sectional view of an exhaust pressure control system according to a fifth embodiment of the present invention.
- FIG. 11 is a schematic sectional view of an exhaust pressure control system according to a sixth embodiment of the present invention.
- Fig. 12 is a schematic sectional view of an exhaust pressure control system according to a seventh embodiment of the present invention.
- a vehicle engine 20 may have a cylinder 30 in which a piston 35 may reciprocate to provide intake, compression, expansion, and exhaust strokes. It is contemplated that the engine 20 may be adapted for four-cycle and/or two-cycle engine applications. At the top of the
- cylinder 30 there may be at least one intake valve 32 and one exhaust valve 34.
- the housing 110 may be secured to an engine component, such as, for example, an exhaust manifold (not shown).
- the valve 100 is adapted to move between an engine component, such as, for example, an exhaust manifold (not shown).
- valve 100 In the open position, the valve 100 substantially permits the flow of gas (in the direction of the arrow 1 shown in Fig.3) through the housing 110 from an upstream side 2 of the valve to a downstream side 3 of the valve. In the closed position, the valve 100 substantially restricts the flow of gas through the housing 110. In this manner, when the valve 100 is in its closed position exhaust pressure may be generated in the manifold upstream of the valve.
- the bushing member 115 which is securely fit in the housing 110.
- the bushing member 115 is securely fit in the housing 110.
- the securing means 220 may
- valve 100 comprises a screw, a rivet, or other suitable means for securing the valve 100 to the
- valve actuator 200 is adapted to rotate the actuator shaft 210, which, in turn, rotates the valve 100 between its open and closed positions.
- An embodiment of the valve actuator 200 is shown in Fig. 4. In one
- the valve actuator 200 may comprise a pneumatic actuator.
- the pneumatic actuator 200 may comprise a piston 230 secured to a heat shield 232, a piston rod 234, and a lever 236.
- a motor not shown
- the piston rod 234 moves laterally outward from the piston 230, causing the lever
- valve actuators 200 such as, for example, a hydraulic actuator, an electric actuator, and/or other
- an orifice 120 is formed in the valve 100.
- the orifice 120 defines an opening through
- valve The size, shape, and location of the orifice 120 shown in Fig. 3 is for illustrative
- the orifice 120 may comprise any suitable configuration through which gas
- valve bore 135 is disposed such that the bore 135 intersects with the orifice
- the orifice 120 may be formed substantially orthogonal to the orifice 120
- the shaft 130 may travel downward within the valve bore 135 to a position in which the shaft extends within the bore
- the shaft 130 may travel between the position in which the shaft is
- the shaft 130 is adapted to control the size of the flow area through the orifice 120
- the shaft 130 may be disposed in the valve bore 135 such that the shaft 130 may travel axially within the bore, and also may be adapted to move slightly laterally within the valve bore. When the exhaust gas acts on the shaft 130, the shaft may move laterally within the valve bore
- the shaft 130 is operatively connected to a piston 140 which is slidably disposed in a bore 142 formed in a piston housing 144.
- the piston 140 is adapted to move axially in an upward and downward direction within the
- piston bore 142 in response to an actuating force.
- the motion of the piston 140 within the piston bore 142 causes corresponding upward or downward motion of the shaft 130 within the valve bore 135.
- the motion of the shaft 130 and the piston 140 is substantially orthogonal to the direction of the exhaust gas flow.
- the piston housing 144 may be secured to the housing 110 by one or more securing means 146, such as, for example, a screw or rivet.
- one or more sealing rings such as, for example, a screw or rivet.
- a spring 150 may bias the piston 140 in an upward direction within the piston bore 142. In one embodiment, the spring 150 may bias the piston 140 into a position such
- the shaft 130 extends within the valve bore 135 above the orifice 120, as shown in Fig. 3. In this manner, the shaft 130 may be biased into a position in which the shaft
- adjustable screw 160 extends through a screw plate 162 and into the piston bore 142, and
- the locking nut 164 may be adjusted to extend the screw 160 a desired distance within the piston bore 142. The further the screw 160 is
- a spring seat 152 may be adjusted to adjust its position within the piston bore
- This pressure may communicate with
- This arrangement may allow the shaft 130 to rotate slightly about the hinge pin. This arrangement may
- the pressure may communicate with the valve bore 142 through the back pressure port 112 and act on the piston 140 against the biasing force of the spring 150.
- the pressure may cause the piston 140 to travel downward within the piston bore 142. Because the area for providing the actuating force on the piston 140 (the back
- the actuating force provided by the exhaust pressure acts on the piston 140 substantially independent of the effect of dynamic pressure created by the flow of gas through the orifice 120.
- the downward motion of the piston 140 causes the downward motion of the shaft 130 within the valve bore 135. As the shaft 130 moves downward, the flow area
- the level of exhaust back pressure in the exhaust manifold may be reduced.
- the level of exhaust pressure becomes equal to or slightly less than the biasing force of the spring 150
- the spring 150 causes the piston 140 to move upward within the piston bore. This, in turn,
- the level of exhaust back pressure may be maintained substantially near the level of the exhaust pressure limit of the engine, and may be controlled so as to optimize the engine retarding power.
- FIG. 9 Another embodiment of the present invention is shown in Fig. 9, in which like reference numerals refer to like elements from other embodiments.
- the embodiment shown in Fig. 9 may operate without the back pressure port 112.
- the system 10 may
- the fluid pressure source 300 may provide air pressure, hydraulic fluid pressure, and/or any other suitable pressure which may communicate with the valve bore 142.
- the fluid pressure source 300 may comprise a
- a pressure regulator 325 may be
- the pressure regulator may be used to reduce the level of pressure supplied by the pressure source (e.g. 100-120 psig) to a predetermined pressure level, which may include a pressure at or near the level of the exhaust pressure limit in the engine (e.g., 60-65 psig).
- the pressure source 300 is adapted to provide a pressure (reduced to a
- the pressure source 300 may provide pressure to the piston bore 142 in response to a signal received from an engine control module (ECM) 350.
- ECM 350 may include a computer and may be connected to one or more sensors located in an appropriate engine component, such as, for example, the engine cylinder and/or the exhaust manifold. The ECM 350 may determine the appropriate time to provide or not
- FIG. 10 Another embodiment of the present invention is shown in Fig. 10, in which like reference numerals refer to like elements from other embodiments.
- the system shown in Fig. 10 is similar to the system shown in Fig. 9.
- the inlet port 141 may be provided below the piston 140, and the system may be provided without the spring 150.
- the pressure source is adapted to provide pressure which may be reduced to a predetermined level by the pressure regulator 325.
- the pressure source 300 may provide
- the pressure may act on the piston 140 biasing
- the position of the shaft 130 will adjust to increase the flow area through the orifice 120, reducing the exhaust pressure level until it is equal to the supplied pressure.
- the level of exhaust back pressure may be maintained substantially near the level of the exhaust pressure limit of the engine, and may be controlled so as to optimize the engine retarding power.
- FIG. 11 Another embodiment of the present invention is shown in Fig. 11 , in which like reference numerals refer to like elements from other embodiments.
- the system may include a first inlet port 141 provided above the piston 140 and a second inlet port 143 provided below the piston 140.
- a proportioning valve 330 may be disposed between the
- the proportioning valve 330 may be adapted to provide a first pressure to the bore through the first inlet port 141 and a
- the resulting pressure differential on the piston 140 may cause the piston to move upward within the piston bore, which, in turn, causes the upward movement of the
- the system 10 may include a plurality of orifices 120 formed in the valve 100.
- the system may include four (4) orifices 120.
- each orifice 120 defines an opening through which gas may flow from the upstream side 2 of the valve 100 to the downstream side 3.
- the orifices 120 create a flow area through the valve 100.
- the number of orifices 120 shown in Fig. 12 is
- the system 10 may comprise any suitable number of orifices 120 to create a flow area through the valve 100 without departing from the scope of the present invention.
- a plurality of annular recesses 134 may be formed in the shaft 130.
- the annular recesses 134 are formed in the shaft 130 such that each recess may selectively align with
- the shaft 130 may be biased upward within the valve bore 135 by the piston spring 150 to a position in which the annular recesses 134 are not aligned with the
- the shaft 130 may travel downward within the valve
- a control signal may be provided to actuate the valve 100.
- exhaust gas back pressure may be generated in the exhaust manifold on the upstream side 3 of the valve 100. This pressure may communicate with the valve bore 142 through the back pressure port 112 and act on the piston 140 against the biasing force of the spring 150.
- the level of exhaust back pressure becomes equal to or slightly greater than the biasing force of the spring 150, the pressure may cause the piston 140 to travel downward within the piston bore 142. Because the area for providing the actuating force on the
- piston 140 (the back pressure port 112) is apart from the area where the flow is controlled (the orifice 120), the actuating force provided by the exhaust pressure acts on the piston
- each orifice 120 may increase. As a result, more gas may be permitted to flow
- the level of exhaust back pressure in the exhaust manifold may be reduced.
- the level of exhaust pressure becomes equal to or slightly less than the biasing force of the spring 150
- the shaft 130 causes the shaft 130 to move upward within the valve bore 135 and reduce the size of the total orifice flow area.
- the level of exhaust back pressure may be maintained substantially near the level of the exhaust pressure limit of the engine, and may be controlled so as to optimize the engine retarding power.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Exhaust Silencers (AREA)
- Fluid-Driven Valves (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05705238A EP1841961B1 (en) | 2004-11-22 | 2005-01-10 | Apparatus and method for controlling exhaust pressure |
BRPI0518038-4A BRPI0518038B1 (en) | 2004-11-22 | 2005-01-10 | APPLIANCE TO CONTROL EXHAUST PRESSURE |
DE602005022771T DE602005022771D1 (en) | 2004-11-22 | 2005-01-10 | DEVICE AND METHOD FOR CONTROLLING EXHAUST GAS PRESSURE |
CN2005800468805A CN101103190B (en) | 2004-11-22 | 2005-01-10 | Apparatus and method for controlling exhaust pressure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US62938204P | 2004-11-22 | 2004-11-22 | |
US60/629,382 | 2004-11-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006057648A1 true WO2006057648A1 (en) | 2006-06-01 |
Family
ID=36498288
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/000474 WO2006057648A1 (en) | 2004-11-22 | 2005-01-10 | Apparatus and method for controlling exhaust pressure |
Country Status (6)
Country | Link |
---|---|
US (1) | US7350502B2 (en) |
EP (1) | EP1841961B1 (en) |
CN (2) | CN102094714B (en) |
BR (1) | BRPI0518038B1 (en) |
DE (1) | DE602005022771D1 (en) |
WO (1) | WO2006057648A1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8820276B2 (en) | 1997-12-11 | 2014-09-02 | Jacobs Vehicle Systems, Inc. | Variable lost motion valve actuator and method |
US7401592B2 (en) * | 2006-11-21 | 2008-07-22 | Emcon Technologies Llc | Hybrid exhaust valve assembly |
US7735466B1 (en) * | 2009-06-12 | 2010-06-15 | Jacobs Vehicle Systems, Inc. | Exhaust brake |
KR101526378B1 (en) * | 2009-12-02 | 2015-06-08 | 현대자동차 주식회사 | Variable compression ratio and exhaust gas brake apparatus |
BR112012026374B1 (en) * | 2010-04-16 | 2020-12-15 | International Engine Intellectual Property Company, Llc | ENGINE BRAKING SYSTEM |
CN102536472B (en) * | 2011-12-31 | 2016-12-21 | 中国第一汽车股份有限公司 | Auxiliary braking method for unit pump electric control system of diesel |
CN102849057B (en) * | 2012-09-18 | 2016-06-01 | 浙江亿日气动科技有限公司 | The pressure limiting having circular arc piston to overlap is lost heart and is assisted braking valve unit |
CN102852654B (en) * | 2012-09-18 | 2016-04-06 | 浙江亿日气动科技有限公司 | The pressure limiting of concave piston sleeve is had to lose heart auxiliary braking control valve unit |
CN102852649B (en) * | 2012-09-18 | 2016-06-22 | 浙江亿日气动科技有限公司 | There is the disappointing auxiliary braking valve gear of pressure limiting of bucket tappet |
CN102852651B (en) * | 2012-09-18 | 2016-02-03 | 浙江亿日气动科技有限公司 | In a zigzag the pressure limiting of passage is lost heart auxiliary braking control valve unit |
CN102852648B (en) * | 2012-09-18 | 2017-02-01 | 浙江亿日气动科技有限公司 | Pressure limiting and air leaking auxiliary brake valve device with circular-arc-shaped pressure leaking port |
CN102877950B (en) * | 2012-10-25 | 2016-02-03 | 浙江亿日气动科技有限公司 | The pressure limiting of end face bucket tappet is had to lose heart auxiliary braking control valve unit |
CN102877951B (en) * | 2012-10-25 | 2016-02-10 | 浙江亿日气动科技有限公司 | The pressure limiting having bucket tappet to overlap is lost heart auxiliary braking control valve unit |
US20150219008A1 (en) * | 2015-03-23 | 2015-08-06 | Ernst Hunkeler | Compact Sailplane Engine |
CN108180078B (en) * | 2017-12-26 | 2020-07-28 | 浙江亿日气动科技有限公司 | Discharge control valve |
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US5079921A (en) * | 1990-06-11 | 1992-01-14 | Navistar International Transporation Corp. | Exhaust back pressure control system |
US5630392A (en) * | 1993-06-16 | 1997-05-20 | Hersham Valves Limited | Exhaust brake |
US6179096B1 (en) * | 1997-11-12 | 2001-01-30 | Diesel Engine Retarders, Inc. | Exhaust brake variable bypass circuit |
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KR100394617B1 (en) * | 2000-09-15 | 2003-08-14 | 현대자동차주식회사 | Exhaust gas recirculation device of vehicle |
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JP3753042B2 (en) * | 2001-10-15 | 2006-03-08 | いすゞ自動車株式会社 | Exhaust brake control device |
EP1497579A1 (en) | 2002-04-15 | 2005-01-19 | Jenara Enterprises Ltd. | Exhaust gas control valve, apparatus and method of controlling exhaust gas flow |
-
2005
- 2005-01-10 CN CN201010564130.XA patent/CN102094714B/en active Active
- 2005-01-10 BR BRPI0518038-4A patent/BRPI0518038B1/en active IP Right Grant
- 2005-01-10 CN CN2005800468805A patent/CN101103190B/en active Active
- 2005-01-10 WO PCT/US2005/000474 patent/WO2006057648A1/en active Application Filing
- 2005-01-10 DE DE602005022771T patent/DE602005022771D1/en active Active
- 2005-01-10 US US11/030,895 patent/US7350502B2/en active Active
- 2005-01-10 EP EP05705238A patent/EP1841961B1/en not_active Expired - Fee Related
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US5079921A (en) * | 1990-06-11 | 1992-01-14 | Navistar International Transporation Corp. | Exhaust back pressure control system |
US5630392A (en) * | 1993-06-16 | 1997-05-20 | Hersham Valves Limited | Exhaust brake |
US6179096B1 (en) * | 1997-11-12 | 2001-01-30 | Diesel Engine Retarders, Inc. | Exhaust brake variable bypass circuit |
Non-Patent Citations (1)
Title |
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See also references of EP1841961A4 * |
Also Published As
Publication number | Publication date |
---|---|
CN101103190B (en) | 2013-07-31 |
US7350502B2 (en) | 2008-04-01 |
BRPI0518038B1 (en) | 2018-05-22 |
CN102094714A (en) | 2011-06-15 |
CN102094714B (en) | 2014-01-15 |
BRPI0518038A (en) | 2008-10-28 |
US20060107922A1 (en) | 2006-05-25 |
DE602005022771D1 (en) | 2010-09-16 |
EP1841961A1 (en) | 2007-10-10 |
EP1841961B1 (en) | 2010-08-04 |
EP1841961A4 (en) | 2009-04-15 |
CN101103190A (en) | 2008-01-09 |
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