TECHNICAL FIELD
[0001] The present invention relates to a cooling control device managing a temperature
level of an internal combustion engine using a coolant.
BACKGROUND ART
[0002] A technology including a water pump, an Exhaust Gas Recirculation cooler, or an EGR
cooler, and a radiator is disclosed in Patent reference 1 as a cooling control device
including the aforementioned configuration. The water pump circulates a coolant of
the internal combustion engine. The EGR cooler is supplied with the coolant. The radiator
is supplied with the coolant.
[0003] In Patent reference 1, a control mode promoting the warm-up of the internal combustion
engine by maintaining a state in which the coolant is not supplied to the radiator
while supplying the coolant to the EGR cooler when the temperature level of the coolant
is low by including a thermostat at a flow path supplying the coolant from the internal
combustion engine to the radiator.
[0004] Patent reference 2 discloses a technology including a water pump circulating a coolant
of an internal combustion engine, an EGR cooler being supplied with the coolant, and
a radiator being supplied with the coolant.
[0005] Patent reference 2 discloses a control mode in which the water pump is configured
to be transmitted with a drive force from a crankshaft of the internal combustion
engine via an electromagnetic clutch, the control mode inhibiting boiling of the coolant
at the EGR cooler by operating the water pump in a case where the temperature level
of the coolant increases when the water pump is in a stopped state.
DOCUMENT OF PRIOR ART
PATENT DOCUMENT
OVERVIEW OF INVENTION
PROBLEM TO BE SOLVED BY INVENTION
[0007] When the engine, which includes a cooling control device having a configuration supplying
a coolant of an internal combustion engine to an EGR cooler and an oil cooler other
than a radiator, is warmed up, because the engine is required to be warmed up early,
the coolant is not supplied to the radiator, however, the coolant is required to be
supplied to the EGR cooler and the oil cooler.
[0008] In both Patent references 1 and 2, the control supplying the coolant to the EGR cooler
is performed in a state where the coolant is not supplied to the radiator. In addition,
a control mode, which supplies the coolant to the oil cooler other than the EGR cooler
when the EGR cooler is supplied with the coolant, is required.
[0009] That is, in the warm up operation, the temperature level of lubricating oil is often
low, and, in order to decrease the viscosity of the lubricating oil, the increase
of the temperature level of the lubricating oil is required by the supply of the coolant
to the oil cooler early. However, in a case where the sequence is set such that the
control supplying cooling water to the EGR cooler is performed prior to that the cooling
water is supplied to the oil cooler when the water temperature level of the cooling
water increases up to a predetermined value, the cooling water cannot be supplied
to the oil cooler until the temperature level of the coolant reaches a predetermined
value, and therefore, there is a room for improvement.
[0010] Consequently, it is desired that a cooling control device is configured, at which
even in a state where a coolant of an internal combustion engine is supplied to a
specific one of plural heat exchangers, the coolant may be supplied to another heat
exchangers as required.
MEANS FOR SOLVING PROBLEM
[0011] A characteristic of the present invention is that a cooling control device includes
a coolant pump being driven by a drive force of an internal combustion engine, a heat
exchanger being provided at each of a plurality of flow paths to which a coolant sent
by the coolant pump is supplied in parallel to one another, a flow amount control
valve controlling a flow of the coolant relative to the plurality of flow paths, and
a control portion controlling the flow amount control valve. The control portion performs
a control in a first supply mode in which the coolant is supplied to a first flow
path constituting one of the plurality of flow paths by a control of the flow amount
control valve, and a second supply mode in which the coolant is supplied to a second
flow path constituting another one of the plurality of flow paths, during a supply
of the coolant to the first flow path, by the control of the flow amount control valve.
The control portion operates a switching control shifting to the second supply mode
temporarily based on a control signal in a state of being in the first supply mode,
and returning to the first supply mode.
[0012] According to the configuration, for example, even though the heat exchanger that
should perform heat exchange with the coolant prefentially is provided at the first
flow path, the control portion may shift to the second supply mode temporarily in
a state where the coolant is continuously supplied to the heat exchanger by the switching
control in a case where the control portion acquires the control information. In addition,
after shifting to the second supply mode, the control portion automatically returns
to the first supply mode. Accordingly, the efficiency of the heat exchange at the
heat exchanger of the first flow path is not deteriorated. That is, comparing to a
case where the control portion always shifts to the second supply mode, the control
portion may supply the coolant to the second flow path to allow heat exchange at the
heat exchanger of the second flow path by the switching control while inhibiting the
temperature level of the fluid from decreasing. Accordingly, even in a state where
the coolant of the internal combustion engine is supplied to a specific one of the
plural heat exchangers, the cooling control device is configured to be able to supply
the coolant to another one of the heat exchangers as required.
[0013] The present invention may be that the control signal is outputted based on request
information requesting heat exchange of a cooling water by the heat exchanger provided
at the second flow path.
[0014] Accordingly, even in a state where the control portion exchanges heat by a predetermined
heat exchanger in the first supply mode, the coolant may be supplied to the heat exchanger
which requires heat exchange by the cooling control device that shifts to the second
supply mode by generating control signals in a case where the control portion receives
request information requesting the heat exchange at another one of the heat exchangers.
[0015] The present invention may be that the control portion performs the first supply mode
before a warm up of a first heat exchanger of the plurality of heat exchangers is
completed, the first heat exchanger being provided at the first flow path, the control
portion performs the second supply mode after the warm up is completed, and in the
switching control, the control portion supplies the coolant of a required flow amount
to the second flow path even before the warm up is completed.
[0016] Accordingly, in a case where the temperature level of fluid is relatively low, for
example, before the warm-up of the heat exchanger provided in the first flow path
is completed, the control portion supplies the coolant to the targeted heat exchanger
by the first supply mode while increasing the temperature level of the cooling water
by the warm-up of the internal combustion engine. Next, in a case where the temperature
level of fluid reaches equal to or greater than a set value, for example, after the
warm-up of the heat exchanger provided in the first flow path is completed, the control
portion may automatically shift to the second supply mode, and may supply the coolant
to the heat exchanger of the second flow path. Even before the completion of the warm-up
of the heat exchanger provided in the first flow path, the control portion may supply
the coolant of the required flow amount to the second flow path.
[0017] The present invention may be that the required flow amount corresponds to a fluid
amount of the coolant that is accumulated from an outlet of the internal combustion
engine to an outlet of a second heat exchanger of the plurality of heat exchangers
at the second flow path.
[0018] Accordingly, the coolant having the fluid amount corresponding to the coolant arranged
in the flow path from an outlet of the internal combustion engine to an outlet of
the heat exchanger is flown to the flow path. Accordingly, when the coolant existed
in the outlet of the internal combustion engine reaches the outlet of the heat exchanger,
the coolant existed inside the internal combustion engine relative to the outlet thereof
is supplied to the heat exchanger. Accordingly, because only the least required amount
of flow amount of the coolant is flown, the coolant heated by the internal combustion
engine may be supplied to the heat exchanger of the second flow path without disturbing
the warm-up of the heat exchanger of the first flow path and of an engine main body.
[0019] The present invention may be that the first supply mode is established by the flow
amount control valve that operates by a drive force of an actuator to increase an
opening of a valve portion relative to the first flow path, and the second supply
mode is established by the flow amount control valve by a further operation of the
actuator to increase the opening of the valve portion relative to the second flow
path while the opening of the valve portion relative to the first flow path is maintained
in a fully-open state.
[0020] Accordingly, because the flow amount control valve is configured to perform the adjustment
of the opening and the switching of the supply modes, the flow amount of the coolant
at the first supply mode and the second supply mode is adjustable by the operation
of the actuator, and at the same time, the switching of the first supply mode and
the second supply mode is available. Accordingly, the number of components may be
reduced.
[0021] The present invention may be that one of the plurality of heat exchangers corresponds
to an Exhaust Gas Recirculation cooler to which a part of combustion gas of the internal
combustion engine is supplied, another one of the plurality of heat exchangers corresponds
to an oil cooler to which a lubricating oil of the internal combustion engine is supplied
by a lubricating oil pump, and the control portion controls the lubricating oil pump
to increase a supplied amount of the lubricating oil in a case of setting the second
supply mode.
[0022] Accordingly, in the first supply mode at the EGR cooler, the EGR cooler which is
in a low temperature level may be warmed up by the coolant in order to introduce an
EGR operation, and in the second supply mode at the oil cooler, the viscosity of the
rubricating oil may be decreased by applying heat of the coolant to the lubricating
oil during the maintenance of the warm up of the EGR cooler.
DESCRIPTION OF DRAWINGS
[0023]
[Fig. 1] is a view of a configuration of a cooling control device;
[Fig. 2] is a chart illustrating an opening of each of valve portions relative to
each of operating amounts of valve bodies;
[Fig. 3] is a graph illustrating a relationship between a flow amount of a coolant
and an oil temperature level of a lubricating oil;
[Fig. 4] is a graph illustrating a relationship between a valve opening and a flow
amount relative to a speed of an engine;
[Fig. 5] is a flowchart of a cooling control routine;
[Fig. 6] is a flowchart of an intermittent control routine; and
[Fig. 7] is a timing chart of the intermittent control routine.
MODE FOR CARRYING OUT THE INVENTION
[0024] An embodiment of a present invention will hereunder be explained with reference to
the drawings.
[Basic configuration]
[0025] As shown in Fig. 1, a cooling control device is configured with a control unit 10
(an example of a control portion) including a cooling circuit and setting an opening
of a flow amount control valve V. The cooling circuit includes a water pump WP, plural
flow paths F, heat exchangers, and a flow amount control valve V. The water pump WP
sends a cooling water (an example of a coolant) of an engine E serving as an internal
combustion engine. The plural flow paths F (a superordinate concept of a first flow
path F1, a second flow path F2, a third flow path F3, and a fourth flow path F4) are
formed in parallel to one another. The heat exchangers each is provided at each of
the plural flow paths F. The flow amount control valve V controls the flow of the
cooling water (an example of the coolant).
[0026] In the cooling control device, a water temperature sensor S (an example of a fluid
temperature sensor) detects the water temperature level of the cooling water (coolant),
and the control unit 10 controls the flow amount control valve V in response to the
detected result to manage the heat exchange between a first supply mode M1 and a second
supply mode M2 which will be described later.
[0027] An Exhaust Gas Recirculation cooler 1 or an EGR cooler 1, an oil cooler 2, and a
radiator 3, which will be described later, are provided as heat exchangers in which
the cooling water is controlled by the flow amount control valve V. A heater core
4 is provided as a heat exchanger in which the cooling water is independently controlled.
The water pump WP (a coolant pump) is driven by a crankshaft of the engine E, and
is disposed between the flow amount control valve V and the engine E.
[0028] The cooling control device is configured to manage the temperature level of the engine
E (the internal combustion engine) of a vehicle of, for example, an automobile. The
engine E includes a water jacket formed at an area over a cylinder block and a cylinder
head. The cooling control device is configured to send the cooling water of the water
jacket to the flow paths F, and to return the cooling water to the water jacket by
the water pump WP after supplying the cooling water to the heat exchanger to exchange
heat. In addition, the engine E is configured to transmit a drive force from the crankshaft
serving as an output shaft to a transmission device. The engine E may be used for
whole internal combustion engines other than a reciprocating engine. The engine E
does not necessarily apply the drive force directly to the transmission device, and
may transmit the drive force to an electric motor of, for example, a hybrid-type vehicle.
[Flow path, heat exchanger]
[0029] The water temperature sensor S is provided at the engine E, and the plural flow paths
F are formed in a mode of being divided from a main flow path FM to which the cooling
water is sent from the engine E. The first flow path F1, the second flow path F2,
the third flow path F3 and the fourth flow F4 are formed as the plural flow paths
F. The EGR cooler 1 is provided at the first flow path F1 as the heat exchanger. The
oil cooler 2 is provided at the second flow path F2 as the heat exchanger. The radiator
3 is provided at the third flow path F3 as the heat exchanger. The heater core 4 is
provided at the fourth flow path F4 as the heat exchanger.
[0030] A technology, which performs the improvement of an element within an exhaust gas
by retrieving a part of the exhaust gas of the engine E and by returning the part
to an intake system, the technology improving the energy consumption, is referred
to as Exhaust Gas Recirculation (EGR). The EGR cooler 1 exchanges heat (cools) the
part of the exhaust gas retrieved from the engine E by the cooling water.
[0031] The oil cooler 2 includes a configuration in which the lubricating oil reserved in
an oil pan 5 of the engine E is supplied by an oil pump 6 (an example of a lubricating
oil pump), and exchanges the heat between the lubricating oil and the coolant. The
lubricating oil having the heat exchange at the oil cooler 2 is supplied to a variable
valve timing control device, or lubricating parts of parts of the engine E. The oil
pump 6 corresponds to a variable oil pressure mechanical oil pump that can control
the oil pressure level by equal to or higher than two stages, and is driven by the
engine E. An oil path sending the lubricating oil that passes the oil cooler 2 includes
an oil temperature sensor Tos detecting the oil temperature.
[0032] The radiator 3 includes a function managing the temperature level of the engine E
by radiating heat of the cooling water, and is supplied with cooling wind by a radiator
fan 7. The radiator fan 7 is driven by a fan motor 7M configured as an electric motor.
The heater core 4 heats an environment of, for example, a cabin of the vehicle. An
electromagnetic valve 8 controlling the flow of the cooling water is provided at the
fourth flow path F4.
[Flow amount control valve]
[0033] The flow amount control valve V is rotational type, and houses valve bodies that
are rotatable inside a valve case. The flow amount control valve V includes a valve
motor VM and a valve sensor VS. The valve motor VM corresponds to the electric motor
serving as an actuator that rotates the valve bodies. The valve sensor VS detects
a rotational angle of the valve bodies. The valve sensor VS corresponds to a hall
element and a potentiometer, and can detect the opening of the valve portion of the
flow amount control valve V at each of supply modes by detecting the rotational angle
of the valve bodies of the flow amount control valve V. Alternatively, the flow amount
control valve V may be slide operation type that houses the valve bodies sliding inside
the valve case.
[0034] The flow amount control valve V includes a first valve portion V1 opening and closing
the first flow path F1, a second valve portion V2 opening and closing the second flow
path F2, and a third valve portion V3 opening and closing the third flow path F3.
In the flow amount control valve V of this configuration, Fig. 2 illustrates the openings
of the first valve portion V1, the second valve portion V2, and the third valve portion
V3 relative to the operating amount of the valve bodies. The first valve portion V1,
the second valve portion V2, and the third valve portion V3 are collectively referred
to as the valve portion.
[0035] Fig. 2 illustrates the openings of the first valve portion V1, the second valve portion
V2, and the third valve portion V3 in a longitudinal axis (the opening is shown by
percentage), and the operating amounts (rotational amounts) of the valve bodies in
a lateral axis. As understood from Fig. 2, when the valve bodies are in the initial
position, the first valve portion V1, the second valve portion V2, and the third valve
portion V3 are in a fully-closed mode M0 where the first valve portion V1, the second
valve portion V2, and the third valve portion V3 are closed, and the cooling water
does not flow in the first flow path F1, the second flow path F2, and the third flow
path F3.
[0036] Next, by the operation of the valve body in an opening direction from the fully-closed
mode M0, the control unit 10 shifts to the first supply mode M1 where the opening
of the first valve portion V1 is adjustable while maintaining the second valve portion
V2 and the third valve portion V3 in a closed state.
[0037] In addition, by the operation of the valve body from the first supply mode M1 in
the opening direction that is beyond the fully-open state, the control unit 10 shifts
to the second supply mode M2 in which the opening of the second valve portion V2 is
adjustable in a state where the opening of the first valve portion V1 is maintained
in a fully-open state (while maintaining the third valve portion V3 in the closed
state).
[0038] By operating the valve body in the opening direction that is beyond the fully-open
state from the second supply mode M2, the control unit 10 shifts to the third supply
mode M3 in which the opening of the third valve portion V3 is adjustable in a state
where the opening of the first valve portion V1 and the opening of the second valve
portion V2 are maintained in the fully-open state.
[0039] Specifically, the flow amount control valve V does not supply the cooling water at
the second valve portion V2 before the opening of the first valve portion V1 reaches
the fully-opening state. Similarly, the flow amount control valve V does not supply
the cooling water at the third valve portion V3 before the opening of the second valve
portion V2 reaches the fully-opening state.
[Control unit, control mode]
[0040] The control unit 10 manages the whole engine E and manages an amount of heat exchanged
in the heat exchanger by controlling the amount of cooling water flown in the flow
path F at the flow amount control valve V when the engine E is driven. The control
mode of the control unit 10 is illustrated in a flowchart shown in Fig. 5. Further,
in this control, the valve motor VM is driven to detect the opening by the valve sensor
VS when the opening (a target opening) of the flow amount control valve V is set.
[0041] That is, the control unit 10 acquires the temperature level of the cooling water
detected by the water temperature sensor S, and operates to warm up the engine E by
maintaining the flow amount control valve V in the fully-closed mode M0 before the
warm up of the engine E is completed. (Step#01 to Step#03)
[0042] In a case where the warm up of the engine E is not completed, for example, like immediately
after the startup of the engine E, the control unit 10 closes the first valve portion
V1, the second valve portion V2, and the third valve portion V3 to increase the temperature
level of the engine E without supplying the cooling water to any of the flow paths
F.
[0043] Next, when the warm-up of the engine E is completed and the warm-up of the EGR cooler
is not completed, the control unit 10 performs the control in the first supply mode
M1 in which the warm-up of the engine E continues, the cooling water is supplied to
the EGR cooler 1, and the opening of the first valve portion V1 increases in response
to the increase of the water temperature level (Step #04, Step #05).
[0044] In the control of the first supply mode M1, the second supply mode M2 and the third
supply mode M3 which will be described later, the control setting the corresponding
valve portion to a target opening, the control, which will be described later, supplying
the cooling water intermittently as required., is performed.
[0045] In the control of the first supply mode M1, for example, when the temperature level
of the lubricating oil is required to be increased, the second supply mode M2 is forcibly
set by opening the second valve portion V2 temporarily so as to supply the cooling
water to the oil cooler 2 while maintaining a state where the cooling water is supplied
to the first flow path F1 (Step #06, Step #07). That is, switching information (request
information) is acquired in Step #06, and in Step #07, the control units 10 shifts
to the second supply mode by the setting time by the control signal based on the switching
information, and the oil supply amount increases. As such, as a switching control,
the control unit 10 performs the control temporarily shifting to the second supply
mode M2 based on the control signal in a state of being in the first supply mode M1,
and returns to the first supply mode.
[0046] As such, when the second supply mode M2 is forcibly set and the cooling water is
supplied to the second flow path F2, the opening and the opening time of the second
valve portion V2 are set so as to supply the required flow amount. The required water
amount corresponds to a value substantially corresponding to a water amount (a fluid
amount) accumulated in the flow passage F from an exit (an outlet) of the cooling
water of the engine E to an outlet of the cooling water of the oil cooler 2 at the
second flow passage F2.
[0047] Accordingly, in a case where the cooling water of the required flow amount is supplied
in the second supply mode M2, the cooling water arranged inside the engine E from
the outlet of the engine E reaches the oil cooler 2. Because the water temperature
level of the cooling water may be inhibited from dropping by the supply of the cooling
water of the minimum required flow amount, both of the warm-up of the EGR cooler 1
and the warm-up of the oil cooler 2 may be accomplished. Fig. 1 illustrates a main
flow passage FM with a long dimension, however, is relatively short in an actual dimension.
[0048] When the cooling water is supplied in the second supply mode M2, the amount of oil
exchanging heat with the cooling water at the oil cooler 2 may be increased by increasing
a discharged pressure level of the oil pump 6.
[0049] Next, when the warm-up of the EGR cooler 1 is completed and the warm-up of the coil
cooler 2 is not completed, the cooling water is supplied to the EGR cooler 1, and
is supplied to the oil cooler 2. In this supply, the control unit 10 performs the
control in the second supply mode M2 in which the opening of the second valve portion
V2 is increased in response to the increase of the water temperature level (Step #08,
Step #09).
[0050] In this second supplied mode M2, in a case where the oil pressure level applied to
the lubricating oil by the oil pump 6 is set at plural levels, the relationship between
the flow amount of the cooling water supplied to the second flow passage F2 and the
temperature level of the lubricating oil is illustrated in Fig. 3. As illustrated
in Fig. 3, the larger the oil pressure level is, and the larger the temperature level
difference (Δ water temperature level - oil temperature level) between the cooling
water and the lubricating oil, the less the flow amount of the cooling water comes
to be. From the temperature level difference between the cooling water and the lubricating
oil, the target flow amount of the cooling water is calculated. Accordingly, when
the estrangement between the water temperature level and the oil temperature level
is large and the oil flow amount is great, the large decrease of the water temperature
level by the oil that takes the heat from the water is inhibited by decreasing of
the water flow amount supplied to the oil cooler 2.
[0051] After that, when the water temperature level of the cooling water increases equal
to or greater than a second switching value, the cooling water is supplied to the
EGR cooler 1, and the cooling water is supplied to the radiator 3 while maintaining
a state where the cooling water is supplied to the oil cooler 2. In this supply, the
control unit 10 performs the control in the third supply mode in which the opening
of the third valve portion V3 is increased in response the increase of the water temperature
level (Step #010).
[0052] In the third supply mode M3, because the temperature level of the engine E reaches
the temperature level required to be cooled, the cooling water is supplied to the
radiator 3, and the control unit 10 manages the temperature level by driving the radiator
fan 7 by driving the fan motor 7M when the engine rotates in a low speed and the water
temperature level is high.
[0053] Fig. 4 illustrates a relationship between the opening (the valve opening) of the
third valve portion V3 and the flow amount of the cooing water in a case where the
speed of the engine E is set at one of plural speeds in the third supply mode M3.
As illustrated in Fig. 4, the higher the speed of the engine E is and the greater
the valve opening is, the more the cooling water supplied to the third flow passage
F3 comes to be. Thus, the control unit 10 corrects the opening of the third valve
portion V3 based on the target flow amount of the cooling water and the speed of the
engine E. Because the tendencies shown in Fig. 4 are shown in the first supply mode
M1 and the second supply mode M2, the control unit 10 corrects similarly in the first
supply mode M1 and the second supply mode M2.
[0054] In a case where the heat exchange is performed by the heater core 4, the control
mode is set such that electromagnetic valve 8 is open by the operation of, for example,
switches, at a timing when the driver requires.
[0055] In the first supply mode M1, the second supply mode M2, and the third supply mode
M3, not only the opening of the valve portion is set, but also the control mode is
set so as to supply the cooling water intermittently when required. The summary of
the control mode is shown in a flow chart in Fig. 6. As a specified example of the
intermittent supply of the cooling water, the timing chart in the second supply mode
M2 is shown in Fig. 7.
[0056] As illustrated in the flowchart in Fig. 6, the control unit 10 calculates the water
flow time based on the speed of the engine E and the required flow amount that should
be supplied to the flow path F, opens the valve portion to supply the cooling water
only by the calculated water flow time, and closes the valve portion (Step #101 to
Step #103).
[0057] As a specific mode of this control, Fig. 7 shows a chart of a control mode when the
second valve portion V2 in the second supply mode M2 is set at the target opening
only by the calculation time. The first valve portion V1 is set at 100 percent in
a case where the second valve portion V2 is set at the target opening.
[0058] Next, the closing time is calculated based on the temperature level of the cooling
water, the temperature level of a heat exchanging target, and the flow speed of the
heat exchanging target, and the valve portion is closed only by the calculated time
(Step #104, Step #105).
[0059] That is, when the heat exchange is operated between the cooling water and the targeted
heat exchanger, only the minimum required flow amount of the cooling water is flown
by the intermittent supply of the cooling water. Accordingly, the cooling water heated
by the oil cooler 2 may be supplied without the inhibition of the warm-up of the EGR
cooler 1 and the engine E. Moreover, the subtle adjustment of the heat exchange that
cannot be controlled only by the setting of the opening of the valve portion is available.
[0060] Next, after the valve portion is closed only by the calculated time, the temperature
levels of the water and of the target for heat exchange are acquired, and whether
or not the intermittent control is required. When the control is required to be continued,
the control is operated again from the control of the Step #101. When not required,
the control is terminated (Step #106 and Step #107).
[Actions and effects of the embodiment]
[0061] As such, according to the configuration of this invention, in a case where the temperature
level of the cooling water increases by the drive of the engine E, firstly, the cooling
water is started to be supplied to the first flow passage F1, and secondly, the cooling
water is started to be supplied to the second flow path F2, and then, the cooling
water is started to be supplied to the third flow path F3. Accordingly, the temperature
level of the exhaust gas returned to the intake system of the engine E is managed
at the EGR cooler 1, next, the temperature level of the lubricating oil is managed
at the oil cooler 2, and the temperature level of the cooling water is managed at
the radiator 3.
[0062] This sequence is set based on a priority relationship that is important for driving
the engine E favorably. However, for example, in a state where the cooling water is
supplied to the EGR cooler 1 (the cooling water is supplied to the first flow path
F1), there is a case in which the temperature level of the lubricating oil is required
to be increased to decrease the viscosity of the lubricating oil.
[0063] In a case where the cooling water is supplied to the oil cooler 2, the temperature
level of the lubricating oil may be efficiently increased by the increase of the discharged
pressure level of the oil pump 6.
[0064] In addition, the supplying amount of the cooling water is supposed to be controlled
with high precision by the use of the water pump driven by the electric motor to manage
the temperature level of the engine E. Here, in the configuration of this invention
in which the flow amount of the cooling water is set by the setting of the opening
of the flow amount control valve V, the cost may be reduced because the water pump
WP driven by the engine E may be used.
[Other embodiment]
[0065] The present invention may be configured as below other than the aforementioned embodiment
(components including the same functions as those of the embodiment are marked with
common numbers or reference numerals as those of the embodiment).
- (a) As the control mode in which the control unit 10 shifts to the second supply mode
M2 temporarily in a state of being in the first supply mode M1, and then, returns
to the first supply mode M1, for example, a control mode, which performs the control
shifting to the second supply mode M2 for only a relatively short time and for plural
times intermittently, may be set.
- (b) In the embodiment, the EGR cooler 1, the oil cooler 2, and the radiator 3 are
shown as the heat exchangers. Other than these, for example, a heater core, a device
exchanging heat of an oil of a transmission device, and a device exchanging heat of
an oil of a supercharger, may be provided as the heat exchangers.
As a specific example, the flow passage F may be configured to supply a coolant to
the oil cooler 2 in the first supply mode M1, and to supply a coolant to the EGR cooler
1 in the second supply mode M2.
- (c) When being used, the heat exchanger may be disposed any positions of the plural
flow paths F on which the heat exchangers are disposed. In addition, a state in which
the coolant is flown in the second flow path F2 may be set as the first supply mode
M1, and a state in which the coolant is flown in the third flow path F3 may be set
as the second supply mode M2.
- (d) The oil pump 6 may be configured to drive the electric motor. By having this configuration,
the amount oil supplied to the oil pump 6 may be easily adjusted.
- (e) The temperature level of oil may be detected to determine whether the warm up
is completed. That is, in a case where the detected temperature level of the oil is
greater than a set value, it is determined that the warm up is terminated.
INDUSTRIAL APPLICABILITY
[0066] The present invention can be used for a cooling control device in which a coolant
managing a temperature level of an internal combustion engine is supplied to a heat
exchanger at plural flow passages.
EXPLANATION OF REFERENCE NUMERALS
[0067]
1. heat exchanger (EGR cooler)
2 heat exchanger (oil cooler)
3 heat exchanger (radiator)
6 lubricating oil pump (oil pump)
10 control portion (control unit)
E internal combustion engine (engine)
F flow path
F1 first flow path
F2 second flow path
V flow amount control valve
V1 valve portion (first valve portion)
V2 valve portion (second valve portion)
V3 valve portion (third valve portion)
VM actuator (valve motor)
WP coolant pump (water pump)
M1 first supply mode
M2 second supply mode