U.S. patent application number 11/770495 was filed with the patent office on 2008-06-19 for system for controlling variable valve.
Invention is credited to Gisoo Hyun.
Application Number | 20080141959 11/770495 |
Document ID | / |
Family ID | 39525634 |
Filed Date | 2008-06-19 |
United States Patent
Application |
20080141959 |
Kind Code |
A1 |
Hyun; Gisoo |
June 19, 2008 |
System for Controlling Variable Valve
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.
Inventors: |
Hyun; Gisoo; (Hwaseong-city,
KR) |
Correspondence
Address: |
MORGAN, LEWIS & BOCKIUS LLP (SF)
One Market, Spear Street Tower, Suite 2800
San Francisco
CA
94105
US
|
Family ID: |
39525634 |
Appl. No.: |
11/770495 |
Filed: |
June 28, 2007 |
Current U.S.
Class: |
123/90.16 ;
123/90.15; 701/105 |
Current CPC
Class: |
F01L 2820/042 20130101;
F01L 2001/34426 20130101; F01L 2800/00 20130101; F01L 9/10
20210101 |
Class at
Publication: |
123/90.16 ;
123/90.15; 701/105 |
International
Class: |
F01L 9/02 20060101
F01L009/02; F01L 1/34 20060101 F01L001/34 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 14, 2006 |
KR |
10-2006-0128187 |
Claims
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.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] 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.
BACKGROUND OF THE INVENTION
[0002] (a) Field of the Invention
[0003] The present invention relates to a system for controlling
variable valve and more particularly, to a system controlling
variable valve not utilizing a cam.
[0004] (b) Description of the Related Art
[0005] 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.
[0006] 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.
[0007] 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.
[0008] In addition, in a case of the camless variable valve system,
another problem occurs that the operation thereof is unstable.
[0009] 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.
SUMMARY OF THE INVENTION
[0010] 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.
[0011] 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.
[0012] 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).
[0013] 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.
[0014] The first and second sensors may be realized as a
Differential Transformer (DTF) sensor.
[0015] The engine control unit (ECU) may output the control signal
on the basis of a clock signals input from outside.
[0016] 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.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] 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:
[0018] FIG. 1 shows a system for controlling variable valve
according to an exemplary embodiment of the present invention.
[0019] 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.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] 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
[0021] FIG. 1 shows a system for controlling variable valve
according to an exemplary embodiment of the present invention.
[0022] 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 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.
[0023] 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.
[0024] The control portion 123 receives the control signal from the
engine control unit (ECU) 105 and transmits the same.
[0025] 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.
[0026] The control portion 123 may be realized as at least one
microprocessor operated by a predetermined program.
[0027] The pressure supply unit 117 supplies pressure to the first
and second valves 109 and 111.
[0028] The first and second sensors 119 and 121 detect positions of
the first and second actuators 113 and 115.
[0029] 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.
[0030] As shown in FIG. 1, the engine control unit (ECU) 105
receives sensing signal of the crank angle sensor 101 corresponding
to a clock signals input from outside.
[0031] That is, the engine control unit (ECU) 105 receives the
sensing signals from the crank angle sensor 101 at a constant time
interval.
[0032] 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.
[0033] 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.
[0034] 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 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.
[0035] Therefore, the intake and exhaust valves 125 and 127 may be
freely controlled corresponding to a variable status and the
engine.
[0036] 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.
[0037] In addition, the 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.
[0038] 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.
[0039] The positions of the first and second actuators 113 and 115
are detected by the first and second sensors 119 and 121.
[0040] That is, 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.
[0041] 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.
[0042] The first and second sensors 119 and 121 may be realized as
a Differential Transformer (DTF) sensor.
[0043] 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.
[0044] At that time, if the operation error occurs, the control
portion 123 outputs the signal to the first and second valves 109
and 111 with compensating the operation error.
[0045] Therefore, according to an exemplary embodiment of the
present invention, the intake and exhaust valves 125 and 127 may be
more precisely controlled.
[0046] 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 125 and 127 can be
improved.
[0047] 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 the control portion 123 and a second amplifier
unit 131 amplifying the feedback signal of the first and second
sensors 119 and 121.
[0048] 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.
[0049] 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.
[0050] 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.
* * * * *