US20080141959A1 - System for Controlling Variable Valve - Google Patents
System for Controlling Variable Valve Download PDFInfo
- Publication number
- US20080141959A1 US20080141959A1 US11/770,495 US77049507A US2008141959A1 US 20080141959 A1 US20080141959 A1 US 20080141959A1 US 77049507 A US77049507 A US 77049507A US 2008141959 A1 US2008141959 A1 US 2008141959A1
- Authority
- US
- United States
- Prior art keywords
- signal
- valve
- intake
- control portion
- ecu
- 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
- 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
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
-
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
-
- 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
- F01L2800/00—Methods of operation using a variable valve timing mechanism
-
- 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
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/04—Sensors
- F01L2820/042—Crankshafts position
Definitions
- the present invention relates to a system for controlling variable valve and more particularly, to a system controlling variable valve not utilizing a cam.
- variable valve system improves fuel consumption and output of an engine and reduces exhaust gas by controlling a phase, an operating angle, and a lift of an intake valve and an exhaust valve.
- a mechanical variable valve system controls the phase, operating angle, and lift of the valve by mechanically controlling a position of a cam or a shaft.
- the present invention has been made in an effort to provide system for controlling variable valve having advantages of stable operation and improving fuel consumption.
- An exemplary embodiment of the present invention provides a system for controlling variable valve controlling intake and exhaust valves of an engine, including a crank angle sensor detecting an angle of a crankshaft, an engine control unit (ECU) outputting a control signal to control the intake and exhaust valves by receiving a signal from the crank angle sensor, a control portion transmitting the signal input from the engine control unit (ECU), a first valve comprising a first actuator opening and closing the intake valve by receiving the signal from the control portion, a second valve comprising a second actuator opening and closing the exhaust valve by receiving the signal from the control portion, a pressure supply unit supplying pressure to the first and second valves, and first and second sensors detecting positions of the first and second actuators, wherein the control portion compensates the position errors of the first and second actuators by receiving the feedback signal from the first and second sensors.
- ECU engine control unit
- the system for controlling variable valve controlling intake and exhaust valves may further include a waveform generator transforming the control signal input from the engine control unit (ECU).
- ECU engine control unit
- the system for controlling variable valve controlling intake and exhaust valves may further includes a first amplifier unit amplifying the signal transmitted from the control portion and a second amplifier unit amplifying the feedback signal transmitted from the first and second sensors.
- the first and second sensors may be realized as a Differential Transformer (DTF) sensor.
- DTF Differential Transformer
- the engine control unit may output the control signal on the basis of a clock signals input from outside.
- FIG. 1 shows a system for controlling variable valve according to an exemplary embodiment of the present invention.
- FIG. 1 shows a system for controlling variable valve according to an exemplary embodiment of the present invention.
- a system for controlling variable valve controlling intake and exhaust valves of an engine includes a crank angle sensor 101 , an engine control unit (ECU) 105 , a control portion 123 , a first valve 109 , a second valve 111 , a pressure supply unit 117 , a first sensor 119 , and a second sensor 121 .
- ECU engine control unit
- the crank angle sensor 101 detects an angle of a crankshaft (not shown) and the engine control unit (ECU) 105 outputs a control signal to control the intake and exhaust valves 125 and 127 by receiving a sensing signal from the crank angle sensor 101 .
- ECU engine control unit
- the control portion 123 receives the control signal from the engine control unit (ECU) 105 and transmits the same.
- the first and second valves 109 and 111 include the first and second actuators 113 and 115 to open and close the intake and exhaust valves 125 and 127 by receiving the signal input from the control portion 123 .
- the control portion 123 may be realized as at least one microprocessor operated by a predetermined program.
- the pressure supply unit 117 supplies pressure to the first and second valves 109 and 111 .
- the first and second sensors 119 and 121 detect positions of the first and second actuators 113 and 115 .
- the control portion 123 receives the feedback signal from the first and second sensors 119 and 121 and compensates position errors of the first and second actuators 113 and 115 .
- the engine control unit (ECU) 105 receives sensing signal of the crank angle sensor 101 corresponding to a clock signals input from outside.
- the engine control unit (ECU) 105 receives the sensing signals from the crank angle sensor 101 at a constant time interval.
- the engine control unit (ECU) 105 transmits a control signal to the control portion 123 and according to an exemplary embodiment of the present invention, the system for controlling variable valve further includes waveform generator 107 transforming the control signal transmitted from the engine control unit (ECU) 105 and transmits a voltage signal to the control portion 123 through the waveform generator 107 and then, the control portion 123 transmits the signal to the first and second valves 109 and 111 .
- the first and second valves 109 and 111 change a phase, an operating angle, and a lift of the intake and exhaust valves 125 and 127 corresponding to the signal of the control portion 123 .
- mechanical elements i.e., constituent elements such as a cam or a camshaft, are not utilized and the intake and exhaust valves 125 and 127 are variably controlled by which the magnitude of the current applied to the first and second valves 109 and 111 is controlled.
- the intake and exhaust valves 125 and 127 may be freely controlled corresponding to a variable status and the engine.
- the first and second valves 109 and 111 include the first and second actuators 113 and 115 and the intake and exhaust valves 125 and 127 are operated by the first and second actuators 113 and 115 .
- first and second valves 109 and 111 control a speed of the first and second actuators 113 and 115 by controlling a fluid amount supplied from the pressure supply unit 117 .
- phase, operating angle and lift of the exhaust valve 127 are controllable, fuel consumption may be improved and contamination may be reduced.
- the positions of the first and second actuators 113 and 115 are detected by the first and second sensors 119 and 121 .
- the position of the first actuator 113 is detected by the first sensor 119 and the position of the second actuator 115 is detected by the second sensor 121 .
- the signals related to the first and second actuators 113 and 115 detected by the first and second sensors 119 and 121 are input to the control portion 123 .
- the first and second sensors 119 and 121 may be realized as a Differential Transformer (DTF) sensor.
- DTF Differential Transformer
- the control portion 123 calculates if operation error of the intake and exhaust valves 125 and 127 occurs by comparing a target value for controlling the intake and exhaust valves 125 and 127 with the feedback signal of the first and second sensors 119 and 121 .
- control portion 123 outputs the signal to the first and second valves 109 and 111 with compensating the operation error.
- the intake and exhaust valves 125 and 127 may be more precisely controlled.
- the system for controlling variable valve further includes a first amplifier unit 129 amplifying the signal transmitted from the control portion 123 and a second amplifier unit 131 amplifying the feedback signal of the first and second sensors 119 and 121 .
- the intake and exhaust valves can be more precisely controlled and degree of freedom of the valve can be improved.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
A system for controlling variable valve includes a crank angle sensor detecting an angle of a crankshaft, an engine control unit (ECU) (ECU) outputting a control signal to the intake and exhaust valves by receiving a sensing signal from the crank angle sensor, a control portion transmitting the signal input from the engine control unit (ECU), a first valve comprising a first actuator controlling the intake valve and a second valve comprising a second actuator controlling the exhaust valve wherein each actuator receives the signal from the control portion, a pressure supply unit supplying pressure to the first and second valves, and first and second sensors detecting positions of the actuators, wherein the control portion compensates the operation error of actuators by receiving the feedback signal from the first and second sensors. By controlling variable valve, the intake and exhaust valves may be precisely controlled and fuel consumption can be improved.
Description
- This application claims priority to and the benefit of Korean Patent Application No. 10-2006-0128187 filed in the Korean Intellectual Property Office on Dec. 14, 2006, the entire contents of which are incorporated herein by reference.
- (a) Field of the Invention
- The present invention relates to a system for controlling variable valve and more particularly, to a system controlling variable valve not utilizing a cam.
- (b) Description of the Related Art
- Typically, a variable valve system improves fuel consumption and output of an engine and reduces exhaust gas by controlling a phase, an operating angle, and a lift of an intake valve and an exhaust valve.
- According to the prior art, a mechanical variable valve system controls the phase, operating angle, and lift of the valve by mechanically controlling a position of a cam or a shaft.
- On the other hand, in a case of a camless variable valve system not utilizing the cam mechanism but utilizing hydraulic pressure and electronic control, a problem occurs that the system is difficult to be disposed in an engine room because of its complicated scheme.
- In addition, in a case of the camless variable valve system, another problem occurs that the operation thereof is unstable.
- The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
- The present invention has been made in an effort to provide system for controlling variable valve having advantages of stable operation and improving fuel consumption.
- An exemplary embodiment of the present invention provides a system for controlling variable valve controlling intake and exhaust valves of an engine, including a crank angle sensor detecting an angle of a crankshaft, an engine control unit (ECU) outputting a control signal to control the intake and exhaust valves by receiving a signal from the crank angle sensor, a control portion transmitting the signal input from the engine control unit (ECU), a first valve comprising a first actuator opening and closing the intake valve by receiving the signal from the control portion, a second valve comprising a second actuator opening and closing the exhaust valve by receiving the signal from the control portion, a pressure supply unit supplying pressure to the first and second valves, and first and second sensors detecting positions of the first and second actuators, wherein the control portion compensates the position errors of the first and second actuators by receiving the feedback signal from the first and second sensors.
- The system for controlling variable valve controlling intake and exhaust valves may further include a waveform generator transforming the control signal input from the engine control unit (ECU).
- The system for controlling variable valve controlling intake and exhaust valves may further includes a first amplifier unit amplifying the signal transmitted from the control portion and a second amplifier unit amplifying the feedback signal transmitted from the first and second sensors.
- The first and second sensors may be realized as a Differential Transformer (DTF) sensor.
- The engine control unit (ECU) may output the control signal on the basis of a clock signals input from outside.
- The above features and advantages of the present invention will be apparent from or are set forth in more detail in the accompanying drawing, which is incorporated in and form a part of this specification, and the following Detailed Description of the Invention, which together serves to explain by way of example the principles of the present invention.
- The above and other features of the present invention will now be described in detail with reference to certain exemplary embodiments thereof illustrated in the accompanying drawing which is given hereinbelow by way of illustration only, and thus is not limitative of the present invention, and wherein:
-
FIG. 1 shows a system for controlling variable valve according to an exemplary embodiment of the present invention. - It should be understood that the appended drawing is not necessarily to scale, presenting a somewhat simplified representation of various preferred features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment.
- Reference will now be made in detail to an embodiment of the present invention, example of which is illustrated in the accompanying drawing and described below. While the invention will be described in conjunction with exemplary embodiment, it will be understood that present description is not intended to limit the invention to the exemplary embodiment. On the contrary, the invention is intended to cover not only the exemplary embodiment, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims
-
FIG. 1 shows a system for controlling variable valve according to an exemplary embodiment of the present invention. - As shown in
FIG. 1 , according to an illustrated exemplary embodiment of the present invention, a system for controlling variable valve controlling intake and exhaust valves of an engine includes acrank angle sensor 101, an engine control unit (ECU) 105, acontrol portion 123, afirst valve 109, asecond valve 111, apressure supply unit 117, afirst sensor 119, and asecond sensor 121. - The
crank angle sensor 101 detects an angle of a crankshaft (not shown) and the engine control unit (ECU) 105 outputs a control signal to control the intake andexhaust valves crank angle sensor 101. - The
control portion 123 receives the control signal from the engine control unit (ECU) 105 and transmits the same. - The first and
second valves second actuators exhaust valves control portion 123. - The
control portion 123 may be realized as at least one microprocessor operated by a predetermined program. - The
pressure supply unit 117 supplies pressure to the first andsecond valves - The first and
second sensors second actuators - The
control portion 123 receives the feedback signal from the first andsecond sensors second actuators - As shown in
FIG. 1 , the engine control unit (ECU) 105 receives sensing signal of thecrank angle sensor 101 corresponding to a clock signals input from outside. - That is, the engine control unit (ECU) 105 receives the sensing signals from the
crank angle sensor 101 at a constant time interval. - The engine control unit (ECU) 105 transmits a control signal to the
control portion 123 and according to an exemplary embodiment of the present invention, the system for controlling variable valve further includeswaveform generator 107 transforming the control signal transmitted from the engine control unit (ECU) 105 and transmits a voltage signal to thecontrol portion 123 through thewaveform generator 107 and then, thecontrol portion 123 transmits the signal to the first andsecond valves - The first and
second valves exhaust valves control portion 123. - That is, according to an exemplary embodiment of the present invention, mechanical elements, i.e., constituent elements such as a cam or a camshaft, are not utilized and the intake and
exhaust valves second valves - Therefore, the intake and
exhaust valves - The first and
second valves second actuators exhaust valves second actuators - In addition, the first and
second valves second actuators pressure supply unit 117. - Therefore, because the phase, operating angle and lift of the
exhaust valve 127 are controllable, fuel consumption may be improved and contamination may be reduced. - The positions of the first and
second actuators second sensors - That is, the position of the
first actuator 113 is detected by thefirst sensor 119 and the position of thesecond actuator 115 is detected by thesecond sensor 121. - The signals related to the first and
second actuators second sensors control portion 123. - The first and
second sensors - The
control portion 123 calculates if operation error of the intake andexhaust valves exhaust valves second sensors - At that time, if the operation error occurs, the
control portion 123 outputs the signal to the first andsecond valves - Therefore, according to an exemplary embodiment of the present invention, the intake and
exhaust valves - In addition, because mechanical friction and power loss due to an inertia of a mass are reduced by not using the cam, operating responsiveness can be improved and degree of freedom of timing and the lift of the intake and
exhaust valves - On the other hand, according to an exemplary embodiment of the present invention, the system for controlling variable valve further includes a
first amplifier unit 129 amplifying the signal transmitted from thecontrol portion 123 and asecond amplifier unit 131 amplifying the feedback signal of the first andsecond sensors - According to an exemplary embodiment of the present invention, the intake and exhaust valves can be more precisely controlled and degree of freedom of the valve can be improved.
- In addition, because the scheme thereof is simple, efficiency of a space of an engine room may be improved. Since a cam is not used, mechanical friction and power loss due to an inertia of a mass are reduced and thus, operating responsiveness can be improved.
- While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (5)
1. A system for controlling variable valve controlling intake and exhaust valves of an engine comprising:
a crank angle sensor detecting an angle of a crankshaft;
an engine control unit outputting a control signal to control the intake and exhaust valves by receiving a sensing signal from the crank angle sensor;
a control portion transmitting the control signal input from the engine control unit (ECU);
a first valve comprising a first actuator opening and closing the intake valve by receiving a signal from the control portion;
a second valve comprising a second actuator opening and closing the exhaust valve by receiving a signal from the control portion;
a pressure supply unit supplying pressure to the first and second valves; and
first and second sensors detecting positions of the first and second actuators,
wherein the control portion compensates position errors of the first and second actuators by receiving feedback signal from the first and second sensors.
2. The system of claim 1 , further comprising at least a waveform generator transforming the control signal input from the engine control unit (ECU).
3. The system of claim 1 , further comprising:
a first amplifier unit amplifying the signal transmitted from the control portion; and
a second amplifier unit amplifying the feedback signal transmitted from the first and second sensors.
4. The system of claim 1 , wherein the first and second sensors are realized as Differential Transformer (DTF) sensor.
5. The system of claim 1 , wherein the engine control unit (ECU) outputs the control signal on the basis of a clock signals input from outside.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020060128187A KR20080055185A (en) | 2006-12-14 | 2006-12-14 | System for controlling variable valve |
KR10-2006-0128187 | 2006-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080141959A1 true US20080141959A1 (en) | 2008-06-19 |
Family
ID=39525634
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/770,495 Abandoned US20080141959A1 (en) | 2006-12-14 | 2007-06-28 | System for Controlling Variable Valve |
Country Status (2)
Country | Link |
---|---|
US (1) | US20080141959A1 (en) |
KR (1) | KR20080055185A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014074084A1 (en) * | 2012-11-09 | 2014-05-15 | Galetskyi Anatolii Yurevich | Gas distribution valve control system for engine |
US20170167411A1 (en) * | 2015-12-10 | 2017-06-15 | Hyundai Motor Company | Variable valve apparatus |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3741176A (en) * | 1971-01-15 | 1973-06-26 | Bosch Gmbh Robert | Pulse generator for controlling the valves of an internal combustion engine |
US5467829A (en) * | 1993-11-30 | 1995-11-21 | Caterpillar Inc. | Automatic lift and tip coordination control system and method of using same |
US6397813B1 (en) * | 2000-04-28 | 2002-06-04 | Ford Global Technologies, Inc. | Method and apparatus for inducing swirl in an engine cylinder by controlling engine valves |
US6915767B2 (en) * | 2003-09-23 | 2005-07-12 | Delphi Technologies, Inc. | Method of determining the position of a cam phaser |
-
2006
- 2006-12-14 KR KR1020060128187A patent/KR20080055185A/en active Search and Examination
-
2007
- 2007-06-28 US US11/770,495 patent/US20080141959A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3741176A (en) * | 1971-01-15 | 1973-06-26 | Bosch Gmbh Robert | Pulse generator for controlling the valves of an internal combustion engine |
US5467829A (en) * | 1993-11-30 | 1995-11-21 | Caterpillar Inc. | Automatic lift and tip coordination control system and method of using same |
US6397813B1 (en) * | 2000-04-28 | 2002-06-04 | Ford Global Technologies, Inc. | Method and apparatus for inducing swirl in an engine cylinder by controlling engine valves |
US6915767B2 (en) * | 2003-09-23 | 2005-07-12 | Delphi Technologies, Inc. | Method of determining the position of a cam phaser |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014074084A1 (en) * | 2012-11-09 | 2014-05-15 | Galetskyi Anatolii Yurevich | Gas distribution valve control system for engine |
US20170167411A1 (en) * | 2015-12-10 | 2017-06-15 | Hyundai Motor Company | Variable valve apparatus |
Also Published As
Publication number | Publication date |
---|---|
KR20080055185A (en) | 2008-06-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HYUNDAI MOTOR COMPANY, KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HYUN, GISOO;REEL/FRAME:019495/0530 Effective date: 20070621 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |