US20020066427A1 - Directly actuated engine valve - Google Patents
Directly actuated engine valve Download PDFInfo
- Publication number
- US20020066427A1 US20020066427A1 US09/989,321 US98932101A US2002066427A1 US 20020066427 A1 US20020066427 A1 US 20020066427A1 US 98932101 A US98932101 A US 98932101A US 2002066427 A1 US2002066427 A1 US 2002066427A1
- Authority
- US
- United States
- Prior art keywords
- engine valve
- electric motor
- engine
- recited
- threaded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
- F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
- F01L2009/2105—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids comprising two or more coils
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2301/00—Using particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
- F01L9/22—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by rotary motors
Definitions
- the present invention relates to engine valves, and more particularly to actuation of engine valves.
- Engine intake and/or exhaust valves are used to control the intake and exhaust in the cylinders of internal combustion engines.
- Camshafts that provide a valve motion profile as a fixed function of the crankshaft position commonly control the valves. While generally effective, ideal intake and exhaust valve timing and lift will vary under varying engine operating conditions. Variable valve timing and lift can account for such changing conditions and substantially improve overall engine performance.
- the engine valve assembly provides an engine valve driven by an electric motor. As the engine valve is directly controlled by the electric motor, each engine valve is individually controllable. Moreover, variable valve timing and variable opening and closing profiles for each of a plurality valves is relatively straightforwardly achieved through a controller.
- the electric motor is a linear electric motor which may include “rare earth” magnets.
- a slidable rotor is fixed to a valve stem of the engine valve such that as the slidable rotor is driven relative to a linear stator, the engine valve is infinitely movable between an open and closed position. Usage of “rare earth” magnets assures that the linear electric motor generates enough force to properly and timely operate the engine valve.
- the electric motor drives a threaded portion of the valve stem. Operation of the electric motor rotates the threaded stem relative to a threaded support. The engine valve is thereby screwed between an open and a closed position.
- the present invention therefore provides a reliable, fast and efficient engine valve actuator which provides the flexibility to vary both valve timing and lift to substantially improve engine performance.
- FIG. 1 is a partial sectional view of an engine valve assembly according to the present invention
- FIG. 2 is a partial sectional view of the engine valve assembly of FIG. 1 in a closed position
- FIG. 1A is an exploded view of another linearly actuated engine valve assembly according to the present invention.
- FIG. 3A is a partial sectional view of another engine valve assembly according to the present invention.
- FIG. 3B is an exploded view of another rotational engine valve assembly according to the present invention.
- FIG. 4 is a partial sectional view of the engine valve assembly of FIG. 3 in a closed position
- FIG. 1 illustrates a general partial sectional view of an engine valve assembly 10 .
- An engine valve 12 such as an intake or exhaust valve, is movably mounted within a cylinder head 14 of an internal combustion engine 16 .
- the engine valve 12 includes a valve stem 18 and a valve head 20 .
- the valve stem 18 defines an axis A.
- the engine valve 12 is movably mounted within a support 22 such that the valve head 20 is movable along axis A.
- the support 22 provides for assembly of components into the cylinder head 14 , and later servicing as a module, but may alternatively be integral with the head.
- the valve head 20 seats against a valve seat 24 to control flow through a port 26 into or out of a combustion chamber 28 within the engine 16 .
- the valve stem 18 is connected to an electric motor 30 .
- the electric motor 30 communicates with a controller (illustrated schematically at 32 ) to drive the engine valve between an open and a closed position (FIG. 2).
- a controller illustrated schematically at 32
- each engine valve 12 is individually controllable.
- variable valve timing and variable opening and closing profiles for each of a plurality valves is relatively straightforwardly achieved through controller 32 .
- the electric motor 30 is a linear electric motor 34 mounted along axis A.
- the linear electric motor 34 includes a linear stator 36 and a slidable rotor 38 which is drivable relative to the linear stator 34 .
- Some rotational motion between the engine valve 12 and the slidable rotor 38 such as through a sleeve type mount is preferably provided to allow rotation of the valve during opening and closing to thereby equalize wear upon the valve head 20 and valve seat 24 .
- the linear stator 36 preferably includes “rare earth” magnets 40 such as Neodymium and Samarium Cobalt magnets.
- a linear electric motor Generally, the slidable rotor 38 is fixed to the valve stem 18 such that as the slidable rotor 38 is driven relative to the linear stator 34 , the engine valve is infinitely movable between the open and closed position. Usage of “rare earth” magnets 40 assures that the linear electric motor 34 generates enough force to properly and timely operate the engine valve 12 . In addition, as the linear electric motor 34 is sequentially actuated, an extremely large inductance is avoided. Avoidance of a large inductance further increases the responsiveness of the linear electric motor 34 and thus the engine valve 12 .
- a housing 35 or the like is mounted to the cylinder head 14 to protect and provide maintenance access to the electric motor 34 . It should be understood that other arrangements will also benefit from the present invention.
- a “force multiplier” such as a rack and pinion arrangement may alternatively or additionally be located between the valve stem 18 a and the linear electric motor 34 a. That is, the slidable rotor 38 a includes a rack gear 39 which rotates a gear reduction arrangement 41 which correspondingly drives a stem rack gear 43 formed on the valve stem 18 a. The force of the linear motor is thereby multiplied to further assure that the linear electric motor 34 a generates enough force to properly and timely operate the engine valve 12 .
- FIG. 3 another engine valve assembly 10 ′ according to the present invention is illustrated.
- the engine valve assembly 10 ′ is generally as described above and common items are defined by the same numerals as above.
- the engine valve assembly 10 ′ includes a threaded support 40 to receive a threaded portion 42 of the valve stem 18 .
- a threaded support 40 to receive a threaded portion 42 of the valve stem 18 .
- one-quarter turn of the valve stem 18 drives the engine valve 12 between an open and a closed (FIG. 4).
- the electric motor 44 is mounted substantially perpendicular to the valve stem 18 such that a screw gear 46 attached to the electric motor rotor 48 engages the threaded portion 42 . Operation of the electric motor 44 drives the engine valve 12 between an open and a closed (FIG. 4).
- the electric motor 44 includes a low-inertial permanent magnet or “squirrel cage” armature motor (illustrated schematically at 50 ) to properly and timely operate the engine valve 12 .
- the electric motor 44 additionally or alternatively includes “rare earth” magnets as described above. It should be understood that other actuators such as a rotary solenoid will also benefit from the present invention.
- FIG. 3A other rotational motor arrangements in which the engine valve 12 b is directly coupled to a rotor 52 which rotates within a fixed stator 54 .
- the engine valve 12 b includes a threaded portion 56 which meshes with a corresponding rotor thread 58 on the rotor 52 .
- a guide 60 such as a key and slot arrangement prevents rotation of the engine valve 12 b.
- Rotation of the rotor 52 thereby causes the rotor thread 56 to act upon the threaded portion 58 of the engine valve and drive the engine valve 12 between an open and a closed position. That is as the engine valve can not rotate interaction of the threads 56 , 58 result in linear motion of the engine valve 12 b.
Abstract
An engine valve assembly includes an engine valve (12) connected to an electric motor (30.) The electric motor may be a linear electric motor (34) which includes “rare earth” magnets to infinitely move the engine valve (12) between an open and closed position. Usage of “rare earth” magnets assures that the linear electric motor (34) generates enough force to properly and timely operate the engine valve (12.) The electric motor (30) may alternatively drive a threaded portion (42) of the valve stem (18.) Operation of the electric motor (30) threads the threaded valve stem (18) relative to a threaded support (40) to drive the engine valve (12′) between an open and a closed position.
Description
- The present application claims priority to U.S. Provisional Patent Application Ser. No. 60/252,119, filed Nov. 20, 2000.
- The present invention relates to engine valves, and more particularly to actuation of engine valves.
- Engine intake and/or exhaust valves are used to control the intake and exhaust in the cylinders of internal combustion engines. Camshafts that provide a valve motion profile as a fixed function of the crankshaft position commonly control the valves. While generally effective, ideal intake and exhaust valve timing and lift will vary under varying engine operating conditions. Variable valve timing and lift can account for such changing conditions and substantially improve overall engine performance.
- Consequently, some attempts have been made to do away with camshafts altogether by individually actuating the engine valves by some type of electromechanical or electrohydraulic means. One known system employs a spring-biased valve with electromagnets as actuators. This may be inadequate as the magnets can not create enough force to properly and timely operate the valves without an inordinate amount of energy. Moreover, the release of the valve is generally too slow for use as an engine valve as the magnetic field takes some time to decrease to zero after the electromagnet is deactivated.
- Accordingly, it is desirable to provide a reliable, fast, and energy efficient actuator for engine valves which provides the flexibility to vary both valve timing and lift to substantially improve engine performance.
- The engine valve assembly according to the present invention provides an engine valve driven by an electric motor. As the engine valve is directly controlled by the electric motor, each engine valve is individually controllable. Moreover, variable valve timing and variable opening and closing profiles for each of a plurality valves is relatively straightforwardly achieved through a controller.
- In one embodiment, the electric motor is a linear electric motor which may include “rare earth” magnets. A slidable rotor is fixed to a valve stem of the engine valve such that as the slidable rotor is driven relative to a linear stator, the engine valve is infinitely movable between an open and closed position. Usage of “rare earth” magnets assures that the linear electric motor generates enough force to properly and timely operate the engine valve.
- In another embodiment, the electric motor drives a threaded portion of the valve stem. Operation of the electric motor rotates the threaded stem relative to a threaded support. The engine valve is thereby screwed between an open and a closed position.
- The present invention therefore provides a reliable, fast and efficient engine valve actuator which provides the flexibility to vary both valve timing and lift to substantially improve engine performance.
- The various features and advantages of this invention will become apparent to those skilled in the art from the following detailed description of the currently preferred embodiment. The drawings that accompany the detailed description can be briefly described as follows:
- FIG. 1 is a partial sectional view of an engine valve assembly according to the present invention;
- FIG. 2 is a partial sectional view of the engine valve assembly of FIG. 1 in a closed position;
- FIG. 1A is an exploded view of another linearly actuated engine valve assembly according to the present invention;
- FIG. 3A is a partial sectional view of another engine valve assembly according to the present invention;
- FIG. 3B is an exploded view of another rotational engine valve assembly according to the present invention;
- FIG. 4 is a partial sectional view of the engine valve assembly of FIG. 3 in a closed position;
- FIG. 1 illustrates a general partial sectional view of an
engine valve assembly 10. Anengine valve 12 such as an intake or exhaust valve, is movably mounted within acylinder head 14 of aninternal combustion engine 16. Theengine valve 12 includes avalve stem 18 and avalve head 20. Thevalve stem 18 defines an axis A. - The
engine valve 12 is movably mounted within asupport 22 such that thevalve head 20 is movable along axis A. Thesupport 22 provides for assembly of components into thecylinder head 14, and later servicing as a module, but may alternatively be integral with the head. The valve head 20 seats against avalve seat 24 to control flow through aport 26 into or out of acombustion chamber 28 within theengine 16. - The
valve stem 18 is connected to anelectric motor 30. Theelectric motor 30 communicates with a controller (illustrated schematically at 32) to drive the engine valve between an open and a closed position (FIG. 2). As the engine valve is directly controlled by the electric motor, eachengine valve 12 is individually controllable. Moreover, variable valve timing and variable opening and closing profiles for each of a plurality valves is relatively straightforwardly achieved throughcontroller 32. - Preferably, the
electric motor 30 is a linearelectric motor 34 mounted along axis A. The linearelectric motor 34 includes alinear stator 36 and aslidable rotor 38 which is drivable relative to thelinear stator 34. Some rotational motion between theengine valve 12 and theslidable rotor 38 such as through a sleeve type mount is preferably provided to allow rotation of the valve during opening and closing to thereby equalize wear upon thevalve head 20 andvalve seat 24. Thelinear stator 36 preferably includes “rare earth”magnets 40 such as Neodymium and Samarium Cobalt magnets. - Detailed operation of a linear electric motor is well known and will only be generally described herein. Generally, the
slidable rotor 38 is fixed to thevalve stem 18 such that as theslidable rotor 38 is driven relative to thelinear stator 34, the engine valve is infinitely movable between the open and closed position. Usage of “rare earth”magnets 40 assures that the linearelectric motor 34 generates enough force to properly and timely operate theengine valve 12. In addition, as the linearelectric motor 34 is sequentially actuated, an extremely large inductance is avoided. Avoidance of a large inductance further increases the responsiveness of the linearelectric motor 34 and thus theengine valve 12. - A
housing 35 or the like is mounted to thecylinder head 14 to protect and provide maintenance access to theelectric motor 34. It should be understood that other arrangements will also benefit from the present invention. - Referring to FIG. 1A, other linear motor arrangements in which the
engine valve 12 a is not directly coupled to theslidable rotor 38 a will also benefit from the present invention. A “force multiplier” such as a rack and pinion arrangement may alternatively or additionally be located between thevalve stem 18 a and the linearelectric motor 34 a. That is, theslidable rotor 38 a includes arack gear 39 which rotates agear reduction arrangement 41 which correspondingly drives a stem rack gear 43 formed on thevalve stem 18 a. The force of the linear motor is thereby multiplied to further assure that the linearelectric motor 34 a generates enough force to properly and timely operate theengine valve 12. - Referring to FIG. 3, another
engine valve assembly 10′ according to the present invention is illustrated. Theengine valve assembly 10′ is generally as described above and common items are defined by the same numerals as above. Theengine valve assembly 10′ includes a threadedsupport 40 to receive a threadedportion 42 of thevalve stem 18. Preferably, one-quarter turn of thevalve stem 18 drives theengine valve 12 between an open and a closed (FIG. 4). - To drive the threaded
valve stem 18, theelectric motor 44 is mounted substantially perpendicular to thevalve stem 18 such that ascrew gear 46 attached to theelectric motor rotor 48 engages the threadedportion 42. Operation of theelectric motor 44 drives theengine valve 12 between an open and a closed (FIG. 4). Preferably, theelectric motor 44 includes a low-inertial permanent magnet or “squirrel cage” armature motor (illustrated schematically at 50) to properly and timely operate theengine valve 12. Theelectric motor 44 additionally or alternatively includes “rare earth” magnets as described above. It should be understood that other actuators such as a rotary solenoid will also benefit from the present invention. - Referring to FIG. 3A, other rotational motor arrangements in which the
engine valve 12 b is directly coupled to arotor 52 which rotates within a fixedstator 54. Theengine valve 12 b includes a threadedportion 56 which meshes with acorresponding rotor thread 58 on therotor 52. Aguide 60 such as a key and slot arrangement prevents rotation of theengine valve 12 b. Rotation of therotor 52 thereby causes therotor thread 56 to act upon the threadedportion 58 of the engine valve and drive theengine valve 12 between an open and a closed position. That is as the engine valve can not rotate interaction of thethreads engine valve 12 b. - The foregoing description is exemplary rather than defined by the limitations within. Many modifications and variations of the present invention are possible in light of the above teachings. The preferred embodiments of this invention have been disclosed, however, one of ordinary skill in the art would recognize that certain modifications would come within the scope of this invention. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described. For that reason the following claims should be studied to determine the true scope and content of this invention.
Claims (14)
1. An engine valve assembly for an engine cylinder comprising:
an engine valve having a stem portion and a head portion, said valve stem defining an axis and; and
an electric motor mounted to said valve stem to drive said engine valve along said axis to move said engine valve between an open and a closed position.
2. The engine valve assembly as recited in claim 1 , wherein said electric motor includes a rare earth magnet.
3. The engine valve assembly as recited in claim 1 , wherein said electric motor is a linear electric motor to slide said vale along said axis.
4. The engine valve assembly as recited in claim 3 , wherein said linear electric motor includes a linear stator and a slidable rotor which is drivable relative to said linear stator, and a force multiplier between said slidable rotor and said valve stem.
5. The engine valve assembly as recited in claim 4 , wherein said force multiplier includes a rack and pinion gear arrangement.
6. The engine valve assembly as recited in claim 1 , wherein said valve stem includes a threaded stem portion.
7. The engine valve assembly as recited in claim 6 , wherein said threaded stem portion is screwed into a threaded support.
8. The engine valve assembly as recited in claim 7 , wherein said electric motor rotates said valve stem to screw said engine valve relative to said support and move said engine valve between said open position and said closed position.
9. The engine valve assembly as recited in claim 1 , wherein said valve stem includes a threaded stem portion and a rotor of said electric motor includes a corresponding threaded portion.
10. An engine valve assembly for an engine cylinder comprising:
an engine valve having a threaded stem portion and a head portion, said threaded valve stem portion defining an axis;
a threaded support to receive said threaded valve stem portion; and
an electric motor operably connected to said threaded valve stem, said electric motor operable to rotate said engine valve relative to said threaded support to drive said engine valve along said axis between an open and a closed position.
11. The engine valve assembly as recited in claim 10 , wherein said electric motor includes a rare earth magnet.
12. The engine valve assembly as recited in claim 10 , wherein said electric motor is mounted substantially perpendicular to said axis.
13. The engine valve assembly as recited in claim 10 , wherein said threaded support includes a rotor rotatably mounted to a fixed stator.
14. The engine valve assembly as recited in claim 13 , further comprising a guide which prevents rotation of said engine valve.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/989,321 US20020066427A1 (en) | 2000-11-20 | 2001-11-20 | Directly actuated engine valve |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US25211900P | 2000-11-20 | 2000-11-20 | |
US09/989,321 US20020066427A1 (en) | 2000-11-20 | 2001-11-20 | Directly actuated engine valve |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020066427A1 true US20020066427A1 (en) | 2002-06-06 |
Family
ID=22954687
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/989,321 Abandoned US20020066427A1 (en) | 2000-11-20 | 2001-11-20 | Directly actuated engine valve |
Country Status (2)
Country | Link |
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US (1) | US20020066427A1 (en) |
WO (1) | WO2002040902A2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040069285A1 (en) * | 2002-07-02 | 2004-04-15 | Telep Robert J. | Gaseous fluid metering valve |
FR2917119A1 (en) * | 2007-06-11 | 2008-12-12 | Valeo Sys Controle Moteur Sas | Valve and actuator assembly for internal combustion engine, has actuator for returning valve to open position, where actuator and valve are arranged to constitute cinematic chain, and guiding module guiding translation of valve along axis |
US7607638B2 (en) | 2005-03-08 | 2009-10-27 | Borgwarner Inc. | EGR valve having rest position |
CN105822378A (en) * | 2016-05-12 | 2016-08-03 | 宁波工程学院 | Electric air inlet valve mechanism with half-moon-shaped head |
US20170154716A1 (en) * | 2015-02-12 | 2017-06-01 | Eaton Corporation | Multi-piece armature and solenoid with amplified stroke |
CN111577469A (en) * | 2020-06-11 | 2020-08-25 | 汉腾新能源汽车科技有限公司 | Engine gas distribution control method |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1019565A (en) * | 1950-06-06 | 1953-01-23 | S E B R O | Valve control of thermal engines |
DE2458635A1 (en) * | 1974-12-11 | 1976-06-16 | Wolf Klemm | Valve operation system especially for ICE - uses electromagnets in place of conventional cam and rocker gear |
DE2754624A1 (en) * | 1977-12-08 | 1979-06-13 | Maschf Augsburg Nuernberg Ag | DEVICE FOR THE CONTROLLABLE DRIVE OF VALVES |
GB2129626A (en) * | 1982-10-12 | 1984-05-16 | Dimitri Egoroff | An electromagnetic shuttle device |
US5327856A (en) * | 1992-12-22 | 1994-07-12 | General Motors Corporation | Method and apparatus for electrically driving engine valves |
US5873335A (en) * | 1998-01-09 | 1999-02-23 | Siemens Automotive Corporation | Engine valve actuation control system |
-
2001
- 2001-11-20 WO PCT/IB2001/002186 patent/WO2002040902A2/en not_active Application Discontinuation
- 2001-11-20 US US09/989,321 patent/US20020066427A1/en not_active Abandoned
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040069285A1 (en) * | 2002-07-02 | 2004-04-15 | Telep Robert J. | Gaseous fluid metering valve |
US7086636B2 (en) | 2002-07-02 | 2006-08-08 | Borgwarner Inc. | Gaseous fluid metering valve |
US20060237675A1 (en) * | 2002-07-02 | 2006-10-26 | Borgwarner Inc. | Gaseous fluid metering valve |
US7487789B2 (en) | 2002-07-02 | 2009-02-10 | Borgwarner Inc. | Gaseous fluid metering valve |
US7607638B2 (en) | 2005-03-08 | 2009-10-27 | Borgwarner Inc. | EGR valve having rest position |
FR2917119A1 (en) * | 2007-06-11 | 2008-12-12 | Valeo Sys Controle Moteur Sas | Valve and actuator assembly for internal combustion engine, has actuator for returning valve to open position, where actuator and valve are arranged to constitute cinematic chain, and guiding module guiding translation of valve along axis |
US20170154716A1 (en) * | 2015-02-12 | 2017-06-01 | Eaton Corporation | Multi-piece armature and solenoid with amplified stroke |
US20180012692A9 (en) * | 2015-02-12 | 2018-01-11 | Eaton Corporation | Multi-piece armature and solenoid with amplified stroke |
CN105822378A (en) * | 2016-05-12 | 2016-08-03 | 宁波工程学院 | Electric air inlet valve mechanism with half-moon-shaped head |
CN111577469A (en) * | 2020-06-11 | 2020-08-25 | 汉腾新能源汽车科技有限公司 | Engine gas distribution control method |
Also Published As
Publication number | Publication date |
---|---|
WO2002040902A3 (en) | 2003-01-03 |
WO2002040902A2 (en) | 2002-05-23 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: SIEMENS AUTOMOTIVE CORPORATION, MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MCCOY, JOHN CURTIS;HILTUNEN, LARRY;REEL/FRAME:012317/0841;SIGNING DATES FROM 20011115 TO 20011120 |
|
STCB | Information on status: application discontinuation |
Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION |