U.S. patent application number 15/682081 was filed with the patent office on 2018-02-22 for engine system having coolant control valve.
The applicant listed for this patent is HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION. Invention is credited to Cheol Soo Park, Jeawoong Yi.
Application Number | 20180051621 15/682081 |
Document ID | / |
Family ID | 61191368 |
Filed Date | 2018-02-22 |
United States Patent
Application |
20180051621 |
Kind Code |
A1 |
Yi; Jeawoong ; et
al. |
February 22, 2018 |
ENGINE SYSTEM HAVING COOLANT CONTROL VALVE
Abstract
An engine system having a coolant control valve unit includes a
valve housing in which a passage having a coolant supplied from one
side of the passage and exhausted to another side of the passage is
formed, a valve configured to rotate with reference to a rotation
center shaft, in which a closing portion closing the passage
according to a rotation position and an opening portion opening the
passage are formed in the valve with a predetermined interval in a
rotation direction, an actuator configured to rotate the valve with
reference to the rotation center shaft, and a controller configured
to control the actuator according to driving conditions, and a
bypass passage penetrating the closing portion of the valve may be
formed in a state that the closing portion closes the passage.
Inventors: |
Yi; Jeawoong; (Uiwang-Si,
KR) ; Park; Cheol Soo; (Suwon-Si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HYUNDAI MOTOR COMPANY
KIA MOTORS CORPORATION |
Seoul
Seoul |
|
KR
KR |
|
|
Family ID: |
61191368 |
Appl. No.: |
15/682081 |
Filed: |
August 21, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F01P 7/16 20130101; F01P
2025/52 20130101; F01P 2025/46 20130101; F01P 11/16 20130101; F01P
2007/146 20130101 |
International
Class: |
F01P 7/16 20060101
F01P007/16 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 22, 2016 |
KR |
10-2016-0106269 |
Claims
1. An engine system having a coolant control valve unit,
comprising: a valve housing in which a passage having a coolant
supplied from one side and exhausted to another side of the passage
is formed; a valve for rotating with reference to a rotation center
shaft, wherein a closing portion closing the passage according to a
rotation position of the valve and an opening portion opening the
passage are formed in the valve with a predetermined interval in a
rotation direction; an actuator for rotating the valve with
reference to the rotation center shaft; and a controller for
controlling the actuator according to driving conditions, wherein a
bypass passage penetrating the closing portion of the valve is
formed in a state that the closing portion closes the passage.
2. The engine system of claim 1, wherein: an exterior circumference
of the closing portion of the valve is formed in a sphere shape,
and the opening portion is formed in a circular shape along a
circumference of the passage.
3. The engine system of claim 2, further comprising: a connecting
member integrally connecting an upper portion with a lower portion
of the valve, wherein the opening portion is formed between the
closing portion and the connecting member.
4. The engine system of claim 3, further comprising: a pipe member
integrally connecting a lower end portion of the connecting member
with an inner side surface of the closing portion, wherein the
bypass passage is formed at a center portion of the pipe
member.
5. The engine system of claim 4, further comprising: a coolant
temperature sensor disposed at the valve housing to sense a
temperature of a coolant passing through an inlet of the pipe
member connected with the lower end portion of the connecting
member.
6. The engine system of claim 1, wherein: a head coolant inlet that
a coolant is supplied from a cylinder head of the engine and a
block coolant inlet that the coolant is supplied from a cylinder
block of the engine are formed at the valve housing, and the valve
controls the coolant supplied from the head coolant inlet.
7. The engine system of claim 6, further comprising: a block
thermostat operating according to a coolant temperature to open or
close the second passage.
8. The engine system of claim 6, wherein: the coolant supplied from
the head coolant inlet and the block coolant inlet is respectively
distributed to a heater core conducting heat exchange with indoor
air; an oil cooler conducting heat exchange with oil circulating
the engine; and a radiator conducting heat exchange with outdoor
air.
9. The engine system of claim 8, further comprising: a radiator
thermostat controlling the coolant operated by the controller and
supplied to the radiator according to temperature of the coolant
exhausted from the radiator.
10. The engine system of claim 8, wherein: the coolant exhausted
from the heater core, the oil cooler, and the radiator is pumped to
the cylinder block of the engine, and the pumped coolant circulates
through the cylinder head and the cylinder block.
11. An engine system having a coolant control valve unit,
comprising: a valve housing including, at one side thereof, a head
coolant inlet that a head coolant is supplied from a cylinder head
of the engine and a block coolant passage that a block coolant is
supplied from a cylinder block of the engine, wherein a first
passage connected with the head coolant inlet and a second passage
connected with the block coolant passage are formed in the valve
housing; a mixing housing disposed at another side of the valve
housing, in which the coolant passing through the first and second
passages gather, and configured to distribute the coolant to
respective coolant demanding elements; a valve for rotating with
reference to a rotation center shaft, wherein a closing portion
closing the first passage according to a rotation position of the
valve and an opening portion opening the passage are formed in the
valve with a predetermined interval in a rotation direction; a
block thermostat operating according to a coolant temperature to
open or close the second passage; an actuator for rotating the
valve with reference to the rotation center shaft; and a controller
for controlling the actuator according to driving conditions,
wherein a bypass passage penetrates the closing portion of the
valve in a state that the closing portion closes the passage.
12. The engine system of claim 11, wherein: an exterior
circumference of the closing portion of the valve is formed in a
sphere shape, and the opening portion is formed in a circular shape
along a circumference of the passage.
13. The engine system of claim 12, further comprising: a connecting
member integrally connecting an upper portion with a lower portion
of the valve; wherein the opening portion is formed between the
closing portion and the connecting member.
14. The engine system of claim 13, further comprising: a pipe
member integrally connecting a lower end portion of the connecting
member with an inner side surface of the closing portion; wherein
the bypass passage is formed at a center portion of the pipe
member.
15. The engine system of claim 14, further comprising: a coolant
temperature sensor disposed at the valve housing to sense a
temperature of a coolant passing through an inlet of the pipe
member connected with the lower end portion of the connecting
member.
16. The engine system of claim 11, wherein: the respective coolant
demanding elements include: a heater core conducting heat exchange
with indoor air; an oil cooler conducting heat exchange with oil
circulating the engine; and a radiator conducting heat exchange
with outdoor air.
17. The engine system of claim 16, further comprising: a radiator
thermostat controlling the coolant operated by the controller and
supplied to the radiator according to temperature of the coolant
exhausted from the radiator.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is based on and claims the benefit of
priority to Korean Patent Application No. 10-2016-0106269 filed on
Aug. 22, 2016 with the Korean Intellectual Property Office, the
entire contents of which are incorporated herein by reference.
TECHNICAL FIELD
[0002] The present disclosure relates to an engine system having a
coolant control valve unit which improves a cooling efficiency and
consumption efficiency of the engine by respectively controlling a
coolant supplied from a cylinder head and a cylinder block of the
engine.
BACKGROUND
[0003] An engine generates a rotation force by combusting fuel, and
the remaining energy from the combustion of the fuel is exhausted
as heat energy. In particular, a coolant absorbs heat energy while
circulating through the engine, a heater, and a radiator, and
discharges the absorbed heat energy to the outside.
[0004] When a coolant temperature of the engine is low, viscosity
of the oil is increased so that a frictional force is increased,
fuel consumption is increased, and a temperature of an exhaust gas
is slowly increased so that time for activation of a catalyst is
extended, and accordingly, quality of the exhaust gas may be
deteriorated. Furthermore, time for normalization of operation of
the heater is extended so that a passenger or a driver may feel
cold.
[0005] When the coolant temperature of the engine is excessively
high, knocking occurs, and ignition timing needs to be adjusted for
suppression of the occurrence of knocking, thereby causing
operation deterioration. In addition, when a temperature of
lubricant is excessively high, lubrication performance may be
deteriorated.
[0006] Thus, one integrated flow control valve that controls
several cooling elements is applied to maintain a temperature of
the coolant at a specific portion of the engine to be high and a
temperature of the coolant at other portions to be low.
[0007] Further, coolant separation cooling method controlling
coolant passing through a cylinder head and coolant passing through
a cylinder block respectively is introduced, and the cylinder head
is controlled by relatively low temperature and the cylinder block
is controlled by relatively high temperature, therefore, fuel
consumption may be reduced and cooling efficiency may be
improved.
[0008] Meanwhile, a coolant temperature sensor sensing temperature
of the coolant exhausted from the cylinder head is disposed. To
improve temperature sensitivity of the coolant temperature sensor,
a bypass hole is formed at a valve so that the coolant flows in a
state that the valve is closed, however, a deviation between real
temperature and sensing temperature of the coolant may be increased
because of distance difference between the bypass hole and the
coolant temperature sensor.
[0009] The above information disclosed in this Background section
is only for enhancement of understanding of the background of the
disclosure 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
[0010] The present disclosure has been made in an effort to provide
an engine system having a coolant control valve unit having
advantages of being capable of improving precision of controlling
by reducing deviation between a sensing temperature sensed from a
coolant temperature sensor and real coolant temperature.
[0011] As described above, an engine system having a coolant
control valve unit according to an exemplary embodiment of the
present disclosure includes a valve housing in which a passage
having a coolant supplied from one side of the passage and
exhausted to another side of the passage is formed, a valve for
rotating with reference to a rotation center shaft, wherein a
closing portion closing the passage according to a rotation
position of the valve and an opening portion opening the passage
are formed in the valve with a predetermined interval in a rotation
direction, and an actuator for rotating the valve with reference to
the rotation center shaft, and a controller for controlling the
actuator according to driving condition, and a bypass passage
penetrating the closing portion of the valve may be formed in a
state that the closing portion closes the passage.
[0012] An exterior circumference of the closing portion of the
valve may be formed in a sphere shape, and the opening portion may
be formed in a circular shape along a circumference of the
passage.
[0013] The engine system having a coolant control valve unit
according to an exemplary embodiment of the present disclosure may
further include a connecting member integrally connecting an upper
portion with a lower portion of the valve, and the opening portion
may be formed between the closing portion and the connecting
member.
[0014] The engine system having a coolant control valve unit
according to an exemplary embodiment of the present disclosure may
further include a pipe member integrally connecting a lower end
portion of the connecting member with an inner side surface of the
closing portion, and the bypass passage may be formed at a center
portion of the pipe member.
[0015] The engine system having a coolant control valve unit
according to an exemplary embodiment of the present disclosure may
further include a coolant temperature sensor disposed at the valve
housing to sense a temperature of a coolant passing through an
inlet of the pipe member connected with the lower end portion of
the connecting member.
[0016] A head coolant inlet that a coolant is supplied from a
cylinder head of the engine and a block coolant inlet that the
coolant is supplied from a cylinder block of the engine may be
formed at the valve housing, and the valve may control the coolant
supplied from the head coolant inlet.
[0017] The engine system having a coolant control valve unit
according to an exemplary embodiment of the present disclosure may
further include a block thermostat operating according to a coolant
temperature to open or close the second passage.
[0018] The coolant supplied from the head coolant inlet and the
block coolant inlet may be respectively distributed to a heater
core conducting heat exchange with indoor air, an oil cooler
conducting heat exchange with oil circulating the engine, and a
radiator conducting heat exchange with outdoor air.
[0019] The engine system having a coolant control valve unit
according to an exemplary embodiment of the present disclosure may
further include a radiator thermostat controlling the coolant
operated by the controller and supplied to the radiator according
to temperature of the coolant exhausted from the radiator.
[0020] The coolant exhausted from the heater core, the oil cooler,
and the radiator may be pumped to the cylinder block of the engine,
and the pumped coolant may circulate through the cylinder head and
the cylinder block.
[0021] An engine system having a coolant control valve unit
according to an exemplary embodiment of the present disclosure may
include a valve housing including, at one side thereof, a head
coolant inlet that a head coolant is supplied from a cylinder head
of the engine and a block coolant passage that a block coolant is
supplied from a cylinder block of the engine, wherein a first
passage connected with the head coolant inlet and a second passage
connected with the block coolant passage are formed in the valve
housing; a mixing housing disposed at another side of the valve
housing, in which the coolant passing through the first and second
passages gather, and configured to distribute the coolant to
respective coolant demanding elements; a valve for rotating with
reference to a rotation center shaft, wherein a closing portion
closing the first passage according to a rotation position of the
valve and an opening portion opening the passage are formed in the
valve with a predetermined interval in a rotation direction; a
block thermostat operating according to a coolant temperature to
open or close the second passage; an actuator for rotating the
valve with reference to the rotation center shaft; and a controller
for controlling the actuator according to driving conditions, a
bypass passage may be formed to penetrate the closing portion of
the valve in a state that the closing portion closes the
passage.
[0022] According to the exemplary embodiments of the present
disclosure, the closing portion and the opening portion are formed
in a predetermined interval in a rotation direction at the valve,
one end portion of the pipe member is integrally connected with the
closing portion, the bypass passage is formed along the center
portion of the pipe member, and the coolant temperature sensor is
disposed at the inlet of the other end of the pipe member.
Therefore, accuracy of sensing the coolant temperature may be
improved.
[0023] Further, the pipe member is integrally formed at the closing
portion of the valve, and the coolant penetrates easily through the
bypass passage in a state that the closing portion of the valve
closes the coolant passage.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] FIG. 1 is a schematic diagram illustrating a coolant flow in
an engine system having a coolant control valve unit according to
an exemplary embodiment of the present disclosure.
[0025] FIG. 2 is a schematic perspective view of a coolant control
valve unit according to an exemplary embodiment of the present
disclosure.
[0026] FIG. 3 is a perspective view of a valve disposed at a
coolant control valve unit according to an exemplary embodiment of
the present disclosure.
[0027] FIG. 4 is a front view of a valve disposed at a coolant
control valve unit according to an exemplary embodiment of the
present disclosure.
[0028] FIG. 5 is a graph showing effect of an engine system having
a coolant control valve unit according to an exemplary embodiment
of the present disclosure.
TABLE-US-00001 <Description of symbols> 100: coolant control
valve unit 102: valve housing 105: cylinder head 115: oil cooler
120: heater core 125: radiator thermostat 130: radiator 140:
coolant pump 110: cylinder block 200: coolant temperature sensor
210: block thermostat 215: block coolant inlet 220: head coolant
inlet 230: actuator 250: valve 252: mixing housing 300: closing
portion 302: rotation center shaft 310: opening portion 312:
connecting member 320: pipe member 325: bypass passage
DETAILED DESCRIPTION
[0029] An exemplary embodiment of the present disclosure will
hereinafter be described in detail with reference to the
accompanying drawings.
[0030] FIG. 1 is a schematic diagram illustrating a coolant flow in
an engine system having a coolant control valve unit according to
an exemplary embodiment of the present disclosure.
[0031] Referring to FIG. 1, the engine system includes a cylinder
head 105, a cylinder block 110, a coolant control valve unit 100, a
heater core 120, an oil cooler 115, a radiator 130, a radiator
thermostat 125, and a coolant pump 140.
[0032] Further, the engine system includes a controller (not shown)
controlling the coolant control valve unit 100, the radiator
thermostat 125, and the coolant pump 140, and the controller may
respectively control the coolant control valve unit 100, the
radiator thermostat 125, and the coolant pump 140. Further,
unexplained portions refer to known techniques.
[0033] Coolant pumped by the coolant pump 140 is pumped to one side
of the cylinder block 110, a portion of the pumped coolant passes
the cylinder block 110, and the remains are distributed to the
cylinder head 105.
[0034] The coolant passing the cylinder head 105 and the cylinder
block 110 is respectively supplied to both sides of the coolant
control valve unit 100, and the coolant control valve unit 100
distributes the supplied coolant to the heater core 120, the oil
cooler 115, and the radiator 130. Here, the coolant control valve
unit 100 may respectively control the head coolant passing the
cylinder head 105 and the block coolant passing the cylinder block
110.
[0035] The radiator thermostat 125 may operate by the controller or
the coolant temperature to control the coolant passed the radiator,
and the coolant passed the heater core 120, the oil cooler 115 and
the radiator 130 recirculates to intake side of the coolant pump
140 again. The structures and functions of the heater core 120, the
oil cooler 115 and the radiator 130 refer to known
technologies.
[0036] FIG. 2 is a schematic perspective view of a coolant control
valve unit according to an exemplary embodiment of the present
disclosure.
[0037] Referring to FIG. 2, the coolant control valve unit 100
includes a valve housing 102, an actuator 230, a valve 250, a head
coolant inlet 220, a block coolant inlet 215, a coolant temperature
sensor 200, and a block thermostat 210.
[0038] On the front surface of the valve housing 102, the head
coolant inlet 220 that the coolant is supplied from the cylinder
head 105 and the block coolant inlet 215 that the coolant is
supplied from the cylinder block 110 are respectively formed, and a
mixing housing 252 that the coolant gathers is disposed at the
opposing side of the block coolant inlet 215.
[0039] The coolant gathered in the mixing housing 252 is
distributed to the heater core 120, the oil cooler 115, and the
radiator 130, as described above.
[0040] The head coolant supplied through the head coolant inlet 220
is gathered in the mixing housing 252 through a first passage
formed in the valve housing 102, and the block coolant supplied
through the block coolant inlet 215 is gathered in the mixing
housing 252 through a second passage formed in the valve housing
102.
[0041] The valve 250 is disposed at the first passage, and the
valve 250 rotates by the actuator 230 to open and close the first
passage. Further, the block thermostat 210 is disposed at the
second passage, and the block thermostat 210 operates by the
coolant temperature to open and close the second passage.
[0042] The coolant temperature sensor 200 is disposed at the
coolant inlet of the valve 250. The coolant temperature sensor 200
penetrates side surface of the valve housing 102 to protrude toward
inside of the head coolant inlet 220.
[0043] The coolant temperature according to an exemplary embodiment
of the present disclosure is disposed at the inlet of the bypass
passage 325 of the valve 250 to improve performance of sensing the
coolant temperature. Hereinafter, the structure of the valve 250
will be described in detail referring to FIG. 3 and FIG. 4.
[0044] FIG. 3 is a perspective view of a valve disposed at a
coolant control valve unit according to an exemplary embodiment of
the present disclosure, and FIG. 4 is a front view of a valve
disposed at a coolant control valve unit according to an exemplary
embodiment of the present disclosure.
[0045] Referring to FIG. 3 and FIG. 4, the valve 250 includes a
virtual rotation center shaft 302, a closing portion 300, an
opening portion 310, a connecting member 312, and a pipe member
320.
[0046] The valve 250 rotates with reference to the rotation center
shaft 302, and the closing portion 300 is formed at a rear side
with reference to the rotation center shaft 302. Further, the
opening portion 310 is formed in a predetermined interval with the
closing portion 300 in the rotation direction. Here, the closing
portion 300 and the opening portion 310 are formed by rotation
difference of about 90 degrees.
[0047] The connecting member 312 integrally connects the upper
portion and the lower portion of the valve 250, the opening portion
310 is formed between the connecting member 312 and the closing
portion 300, and the opening portion 310 is formed as a circular
shape corresponding to the shape of the first passage.
[0048] The pipe member 320 is disposed at the lower portion of the
valve 250 by a distance with the rotation center shaft 302 in a
vertical direction, and the bypass passage 325 is formed at the
center portion of the pipe member 320.
[0049] More particularly, the front end portion of the pipe member
320 is integrally connected with the lower end portion of the
connecting member 312, the rear end portion of the pipe member 320
is integrally connected with the closing portion 300, and the
bypass passage 325 is formed at the center portion of the pipe
member 320.
[0050] In a state that the closing portion 300 closes the first
passage, the coolant exhausted from the cylinder head 105
circulates through the head coolant inlet 220, the inlet of the
pipe member 320, and bypass passage 325 to the mixing housing 252.
Further, the coolant temperature sensor 200 is disposed at the
inlet of the pipe member 320 to improve performance of sensing
coolant temperature.
[0051] FIG. 5 is a graph showing effect of an engine system having
a coolant control valve unit according to an exemplary embodiment
of the present disclosure.
[0052] Referring to FIG. 5, the horizontal axis indicates a time,
and the vertical axis indicates a coolant temperature.
[0053] The coolant temperature sensor output value in the open
state and the direct measuring value of the coolant in the head are
nearly similar. The coolant temperature sensor output value is
slightly smaller than the direct measuring value of the coolant in
the head.
[0054] Further, the coolant sensor output value in the close state
and the direct measuring value of the coolant in the head maintain
high value in the open state, and the coolant temperature sensor
output value in the close state increases to follow the direct
measuring value of the coolant in the head.
[0055] In other words, difference between the coolant sensor output
value in the close state and the direct measuring value of the
coolant in the head decreases than the difference of prior art.
[0056] 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. On the contrary, it is intended to cover
various modifications and equivalent arrangements included within
the spirit and scope of the appended claims.
* * * * *