JP6577828B2 - Cooling water flow control system - Google Patents

Description

  The present invention relates to a system (cooling water flow control system) and a method (cooling water flow control method) for controlling the flow of cooling water for an internal combustion engine such as a gasoline engine.

  For example, Patent Document 1 discloses an oil temperature control device as a cooling water flow control system, and the cooling water flow control system disclosed in Patent Document 1 is a radiator that puts a part of cooling water coming out of an engine into a radiator. A circuit and a bypass circuit for the remainder of the cooling water coming out of the engine to bypass the radiator. The bypass circuit of Patent Document 1 is provided with a valve portion that can take in the remaining cooling water and discharge the cooling water flowing into the heater core and the cooling water flowing into the heat exchanger (oil warmer). It is.

  When the temperature of the engine lubricating oil is lower than the temperature of the cooling water, the valve portion of Patent Document 1 supplies the cooling water flowing into the heat exchanger, thereby efficiently using the lubricating oil while warming up the engine. Can be heated. On the other hand, when the temperature of the lubricating oil is equal to or higher than the temperature of the cooling water, the valve portion of Patent Document 1 can block the supply of the cooling water flowing into the heat exchanger.

JP 2004-301041 A

  Thereafter, when the temperature of the lubricating oil is equal to or higher than a predetermined value higher than the temperature of the cooling water, the valve portion of Patent Document 1 can resume the supply of the cooling water flowing into the heat exchanger. Thereby, lubricating oil can be cooled. However, the present inventors have recognized that the cooling of the lubricating oil is inefficient in the cooling water flow control system including the valve portion of Patent Document 1. In other words, the cooling water flowing into the heat exchanger is supplied to the valve unit from the bypass circuit that bypasses the radiator, so that the cooling water is not cooled by the radiator.

  One object of the present invention is to provide a cooling water flow control system and a cooling water flow control method capable of efficiently cooling a lubricating oil. Other objects of the present invention will become apparent to those skilled in the art by referring to the aspects and best embodiments exemplified below and the accompanying drawings.

  In the following, in order to easily understand the outline of the present invention, embodiments according to the present invention will be exemplified.

In the first aspect, the cooling water flow control system comprises:
A radiator circuit having a radiator, wherein a part of cooling water coming out of an engine is put into the radiator, and the cooling water coming out of the radiator is returned to the engine through a valve portion; and
A first bypass circuit that returns the other part of the cooling water coming out of the engine to the engine via the valve portion as cooling water that bypasses the radiator and flows through the first bypass circuit; ,
A heater core circuit having a heater core, wherein another part of the cooling water coming out of the engine is put into the heater core, and the cooling water coming out of the heater core is passed to the engine through the valve portion. Returning the heater core circuit; and
The cooling water coming out of the radiator, the cooling water flowing through the first bypass circuit, and the cooling water coming out of the heater core can be taken in, and the temperature of the lubricating oil of the engine is adjusted Cooling water flowing into a possible heat exchanger, and the valve part capable of discharging cooling water bypassing the heat exchanger;
With
When the temperature of the cooling water on the outlet side of the engine is less than a first predetermined value, the valve section cuts off the intake of the cooling water coming out of the radiator and bypasses the heat exchanger. Shut off the cooling water discharge,
When the temperature is equal to or higher than the first predetermined value and the load state of the engine is equal to or higher than a second predetermined value, the valve unit maintains the intake of the cooling water coming out of the radiator, And the discharge of the said cooling water which flows into the said heat exchanger is maintained.

  In the first aspect, when the temperature of the cooling water on the outlet side of the engine is lower than the first predetermined value, the valve section cuts off the intake of the cooling water coming out of the radiator, and the heat exchanger (oil warmer) Block the cooling water discharge bypassing In other words, the valve unit can supply the cooling water to the heat exchanger, and thereby can efficiently heat the lubricating oil while warming up the engine.

  Further, in the first aspect, when the temperature of the cooling water on the outlet side of the engine is equal to or higher than the first predetermined value and the load state of the engine is equal to or higher than the second predetermined value, the valve portion is discharged from the radiator. Maintain uptake of incoming cooling water and keep out cooling water flowing into the heat exchanger. The valve part can supply the cooling water coming out of the radiator to the heat exchanger, whereby the lubricating oil can be efficiently cooled when the temperature of the lubricating oil rises. In other words, the cooling water supplied to the heat exchanger is sufficiently cooled by the radiator, and the cooling water is taken into the valve portion.

In a second aspect subordinate to the first aspect, the cooling water flow control system comprises:
A heat exchanger circuit having the heat exchanger, the heat exchanger circuit returning the cooling water flowing from the valve portion to the heat exchanger to the engine;
The second bypass circuit that returns the cooling water that bypasses the heat exchanger to the engine as cooling water that bypasses the heat exchanger and flows through the second bypass circuit;
May be further provided.

  In the second aspect, the heat exchanger circuit and the second bypass circuit can be arranged on the output side of the valve portion.

In a third aspect subordinate to the first aspect, the valve portion includes:
A first valve capable of taking in the cooling water coming out of the radiator and the cooling water coming out of the heater core and discharging the cooling water bypassing the heat exchanger;
The cooling water flowing through the first bypass circuit and a part of the cooling water bypassing the heat exchanger can be taken in, and the cooling water flowing into the heat exchanger can be discharged. Two valves,
The cooling water flow control system may include
A heat exchanger circuit having the heat exchanger, the heat exchanger circuit returning the cooling water flowing from the second valve to the heat exchanger to a second bypass circuit;
As the cooling water flowing through the second bypass circuit, the second bypass circuit that returns another part of the cooling water that bypasses the heat exchanger to the engine;
May be further provided.

  In the third aspect, the valve unit can be constructed by the first valve and the second valve, whereby the output side of the first valve and the output side of the second valve, respectively, A bypass circuit and a heat exchanger circuit can be arranged.

In the fourth aspect, the cooling water flow control method comprises:
Reading the coolant temperature at the outlet side of the engine,
Reading the load state of the engine, and cooling water coming out of the radiator based on the temperature and the load state, cooling water flowing through the first bypass circuit bypassing the radiator, and coming out of the heater core Controlling the cooling water which can take in the cooling water and flows into the heat exchanger capable of adjusting the temperature of the lubricating oil of the engine, and the valve unit which can discharge the cooling water bypassing the heat exchanger thing,
Including
The control of the valve part is
When the temperature is lower than a first predetermined value, the valve unit is configured to block intake of the cooling water coming out of the radiator and block discharge of the cooling water bypassing the heat exchanger. And when the temperature is equal to or higher than the first predetermined value and the load state is equal to or higher than a second predetermined value, the valve unit is allowed to maintain the intake of the cooling water coming out of the radiator, And maintaining the discharge of the cooling water flowing into the heat exchanger,
Have

  In the fourth aspect, when the temperature of the cooling water on the outlet side of the engine is lower than the first predetermined value, the cooling water discharge that blocks the intake of the cooling water coming out of the radiator and bypasses the heat exchanger is discharged. The valve part is controlled so as to shut off. In other words, the valve unit can supply the cooling water to the heat exchanger, and thereby can efficiently heat the lubricating oil while warming up the engine.

  In the fourth aspect, the cooling water coming out of the radiator when the temperature of the cooling water on the outlet side of the engine is equal to or higher than the first predetermined value and the load state of the engine is equal to or higher than the second predetermined value. The valve portion is controlled so as to maintain the intake of the cooling water and maintain the discharge of the cooling water flowing into the heat exchanger. The valve part can supply the cooling water coming out of the radiator to the heat exchanger, whereby the lubricating oil can be efficiently cooled when the temperature of the lubricating oil rises.

  Those skilled in the art will readily understand that the illustrated embodiments according to the present invention can be further modified without departing from the spirit of the present invention.

1 shows a schematic configuration example (first embodiment) of a cooling water flow control system according to the present invention. Sectional drawing of the specific structural example (5 port water control valve) of the valve part of FIG. 1 is shown. FIG. 3 is a sectional view taken along line 3-3 in FIG. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 in FIG. 6 (a) to 6 (i) are diagrams for explaining the operation of the 5-port water control valve shown in FIG. The other schematic structural example (2nd Embodiment) of the cooling water flow control system according to this invention is shown. Sectional drawing of the specific structural example (1st water control valve) of the 1st valve which comprises the valve part of FIG. 7 is shown. FIG. 9 is a sectional view taken along line 9-9 in FIG. 10 (a) to 10 (b) are diagrams for explaining the operation of the first water control valve in FIG. Sectional drawing of the specific structural example (2nd water control valve) of the 2nd valve which comprises the valve part of FIG. 7 is shown. 12 (a) to 12 (c) are diagrams for explaining the operation of the second water control valve in FIG.

  The best mode described below is used to easily understand the present invention. Accordingly, those skilled in the art should note that the present invention is not unduly limited by the embodiments described below.

  FIG. 1 shows a schematic configuration example of a cooling water flow control system according to the present invention. As shown in FIG. 1, the cooling water flow control system includes a radiator circuit (water channel, flow path) having a radiator 10 and cooling water bypassing the radiator 10 in order to control the temperature of the cooling water for the engine 20. A bypass circuit (a bypass circuit of the radiator circuit, a first bypass circuit), and a valve unit 50 capable of taking in the cooling water coming out of the radiator 10 and the cooling water coming out of the bypass circuit. Yes.

  The cooling water flow control system of FIG. 1 further includes a heater core circuit having a heater core 40, and the valve unit 50 can also take in cooling water coming out of the heater core 40. A vehicle such as an automobile not shown includes an engine 20 such as a gasoline engine. The engine 20 is cooled with cooling water, and the cooling water heated by the engine 20 is supplied to the heater core 40 via the pump 36 and the valve unit 50. The interior of the vehicle can be warmed through the heater core 40.

  The cooling water flow control system of FIG. 1 is used for properly functioning the radiator 10 that transmits the heat of the cooling water to the outside air of the vehicle, in other words, for appropriately controlling the temperature of the cooling water using the radiator 10. The detecting unit 24 can be further provided. In addition, the cooling water flow control system of FIG. 1 further includes a cooling water flow control device 60 that is, for example, an ECU (Electronic Control Unit), and the cooling water flow control device 60 includes a valve unit 50 as an example of the operation thereof. The amount of control can be determined. The cooling water flow control system of FIG. 1 may further include another detection unit (not shown) in order to cause the heater core 40 to function properly. In other words, the other detection unit is not shown in FIG. It is omitted.

  The ECU (cooling water flow control device 60) in FIG. 1 may be referred to as a C / U (Control Unit) by those skilled in the art. The ECU (C / U) is generally configured by a microcomputer, for example. Can further include, for example, a CPU, a ROM, a RAM, an input / output interface, and the like. For example, the ROM can store a program for causing the CPU to execute a predetermined operation (cooling water flow control method), and the RAM can form a work area of the CPU. The ECU (for example, a memory such as a ROM) can store data necessary for determining or calculating a control amount of the valve unit 50, for example.

  In FIG. 1, the radiator circuit having the radiator 10 may include, for example, the engine 20, the valve unit 50, and the like, and may further include, for example, a pump 36 and the like. In FIG. 1, in the radiator circuit, a heat exchanger circuit having a heat exchanger 30 (oil warmer) capable of adjusting the temperature of the lubricating oil of the engine 20 and a bypass for circulating cooling water that bypasses the heat exchanger 30. A circuit (a bypass circuit of the heat exchanger circuit, a second bypass circuit) is arranged.

  The pump 36 (water pump) in FIG. 1 is, for example, an electric pump, and each of the radiator circuit, the first bypass circuit, the heater core circuit, the heat exchanger circuit, and the second bypass circuit supplies cooling water to the power of the pump 36. It can be circulated with. In FIG. 1, the pump 36, that is, the electric pump, is disposed between the outlet side of the valve unit 50 and the inlet side of the engine 20. Of course, the pump 36 may be a mechanical pump, for example. However, preferably, the pump 36 is an electric pump. For example, an electric pump powered by a battery power source (not shown) of the vehicle has an amount of cooling water determined by the flow rate and temperature of the cooling water from the valve unit 50 ( A cooling source) can be directed to the engine 20.

  In FIG. 1, the detection unit 24 detects the temperature of the cooling water on the outlet side of the engine 20 and includes, for example, a temperature sensor (water temperature sensor). The ECU in FIG. 1 can read the temperature of the cooling water via the detection unit 24. Here, the ECU is connected to a network LAN such as an in-vehicle network such as a controller area network (CAN), for example, and the ECU reads the load state of the engine 20 via the network LAN (and another ECU not shown). Can do. Specifically, the load state is determined or calculated by the ECU using, for example, an accelerator opening, a vehicle speed, and a gear ratio (transmission gear ratio). In addition to the network LAN, the ECU in FIG. 1 detects an engine speed sensor that detects, for example, the speed of the engine 20, for example, a pressure in an intake pipe (intake manifold) of the engine 20, in addition to the network LAN. A load state of the engine 20 may be determined or calculated using a sensor (not shown) such as an intake pipe internal pressure sensor.

  When the temperature of the cooling water on the outlet side of the engine 20 is lower than the first predetermined value, the valve unit 50 blocks the intake of the cooling water coming out of the radiator 10 and bypasses the heat exchanger 30. Block out spitting. In other words, the valve unit 50 can supply the cooling water to the heat exchanger 30, and thereby can efficiently heat the lubricating oil of the engine 20 while the engine 20 is warmed up.

  Next, when the temperature of the cooling water on the outlet side of the engine 20 is equal to or higher than the first predetermined value and the load state of the engine 20 is equal to or higher than the second predetermined value, the valve unit 50 exits from the radiator 10. The intake of the incoming cooling water is maintained, and the discharge of the cooling water flowing into the heat exchanger 30 is maintained. The valve unit 50 can supply the cooling water coming out of the radiator 10 to the heat exchanger 30, and thereby, the lubricating oil can be efficiently cooled when the temperature of the lubricating oil rises. In other words, the cooling water supplied to the heat exchanger 30 is sufficiently cooled by the radiator 10, and the cooling water is taken into the valve unit 50.

  The first predetermined value means the end of warm-up of the engine 20, and specifically, a temperature threshold value for determining or estimating the end of warm-up of the engine 20, or a temperature for finishing the warm-up of the engine 20 It is a threshold value. As an example, the first predetermined value is 80 degrees Celsius. The second predetermined value means a medium load state or a high load state (low load end) of the engine 20, and specifically, it is determined or estimated that the transition of the engine 20 from the low load state to the medium load state is completed. It is a load threshold for The high load state of the engine 20 includes a state where the vehicle is traveling on a steep uphill with a large accelerator opening and a state where the accelerator opening is 100 [%] (fully open). Including low-load conditions, the vehicle is traveling on a flat road with a small accelerator opening, a constant vehicle speed, and a fixed gear ratio. Including the state. As an example of the second predetermined value, the accelerator opening is 30 [%].

  FIG. 2 shows a cross-sectional view of a specific configuration example (5-port water control valve) of the valve unit 50 of FIG. One skilled in the art should note that the valve portion 50 is not unduly limited by the embodiments described below. As shown in FIG. 2, for example, a 5-port water control valve as the valve unit 50 includes a bottomed cylindrical valve box 51, a cylindrical valve body 52 accommodated in the valve box 51, and the valve body 52. A valve lid 53 that closes the valve box 51 after storing the valve body 51, and a rotary actuator 54 that is provided in the valve box 51 and rotates the valve body 52.

  The valve box 51 in FIG. 2 includes five ports (entrance / exit) including a port B1 (inlet), a port HC (inlet), a port RA (inlet), a port HE (outlet), and a port B2 (outlet). )have. The valve body 52 includes a cylindrical portion 55, an upper lid portion 56 that closes an upper opening of the cylindrical portion 55, and a lower lid portion 57 that closes a lower opening of the cylindrical portion 55. The upper lid portion 56 has a first shaft 59 on which the rotary shaft 58 of the rotary actuator 54 is fitted. The lower lid portion 57 has a second shaft 62 that fits into a recess 61 provided in the valve lid 53. The inside of the valve body 52 becomes a valve flow path 63.

  The cylindrical portion 55 is provided in a first hole 65 connected to the port B1 and the port HC, a second hole 66 provided in a lower position than the first hole 65 and connected to the port RA, and a position lower than the second hole 66. A third hole 67 and a fourth hole 68 connected to the port HE and the port B2 are provided. Further, O-rings 69 are appropriately disposed (in four places in this embodiment) between the inner surface of the valve box 51 and the outer surface of the valve body 52.

  3 shows a cross-sectional view taken along line 3-3 of FIG. As shown in FIG. 3, the port B1 and the port HC are arranged so as to form approximately 90 [degree]. In FIG. 3, the port B <b> 1 is connected to the in-valve flow path 63 through the first hole 65. On the other hand, the port HC is blocked by the valve body 52 and is not connected to the in-valve flow path 63.

  4 shows a cross-sectional view taken along line 4-4 of FIG. As shown in FIG. 4, a second hole 66 is disposed corresponding to the port RA. In FIG. 4, the port RA is blocked by the valve body 52 and is not connected to the in-valve flow path 63.

  FIG. 5 is a sectional view taken along line 5-5 of FIG. As shown in FIG. 5, the port B2 and the port HE are arranged so as to form approximately 100 [degree]. In FIG. 5, the port HE is connected to the in-valve flow path 63 through the third hole 67. On the other hand, the port B2 is blocked by the valve body 52 and is not connected to the in-valve flow path 63.

  6 (a) to 6 (i) are diagrams for explaining the operation of the 5-port water control valve shown in FIG. The operation of the 5-port water control valve (valve unit 50) will be described below. 6A corresponds to FIG. 3, FIG. 6B corresponds to FIG. 4, and FIG. 6C corresponds to FIG.

  The rotation angle of the valve body 52 (a control amount of the valve unit 50) in FIGS. 6A to 6C is 0 [degree]. As shown in FIG. 6A, the port HC is closed and the port B1 is open. As shown in FIG. 6B, the port RA is closed. As shown in FIG. 6C, the port B2 is closed and the port HE is open.

  When the temperature of the cooling water on the outlet side of the engine 20 is lower than the first predetermined value, the cooling water flowing in from the port B1 in FIG. 6A moves through the in-valve flow path 63, and FIG. Out of port HE in c). The 5-port water control valve blocks the intake of the cooling water coming out of the radiator 10 at the port RA (see FIG. 6B), and discharges the cooling water bypassing the heat exchanger 30 at the port B2. It is shut off (see FIG. 6 (c)).

  Next, when the temperature of the cooling water on the outlet side of the engine 20 is equal to or higher than the first predetermined value and the load state of the engine 20 is lower than the second predetermined value, the ECU (cooling water flow control device) in FIG. 60), the valve body 52 of the valve unit 50 of FIG. 2 can be rotated 90 [degree] counterclockwise. The rotation angle of the valve body 52 (a control amount of the valve unit 50) in FIGS. 6D to 6F is 90 [degree]. As shown in FIG. 6D, the port HC is opened and the port B1 is closed. As shown in FIG. 6E, the port RA is opened. As shown in FIG. 6F, the port B2 is opened and the port HE is closed.

  The cooling water flowing in from the port HC in FIG. 6 (d) moves through the in-valve channel 63, flows out from the port B2 in FIG. 6 (f), and flows in from the port RA in FIG. 6 (e). The cooling water moves through the in-valve channel 63 and flows out from the port B2 in FIG. 6 (f). The 5-port water control valve can manage the temperature of the cooling water on the outlet side of the engine 20 by using the radiator 10. The 5-port water control valve functions as a mixing valve capable of mixing the cooling water flowing in from the port HC and the cooling water flowing in from the port RA.

  Next, when the temperature of the cooling water on the outlet side of the engine 20 is equal to or higher than the first predetermined value and the load state of the engine 20 is equal to or higher than the second predetermined value, the ECU (cooling water flow control device) in FIG. 60), the valve body 52 of FIG. 2 can be further rotated 45 [degree] counterclockwise. The rotation angle (control amount of the valve unit 50) of the valve body 52 in FIGS. 6 (g) to 6 (i) is 135 [degree]. As shown in FIG. 6G, the port HC remains open and the port B1 remains closed. As shown in FIG. 6 (h), the port RA remains open. As shown in FIG. 6 (i), the port HE is opened while the port B2 remains open.

  The cooling water flowing in from the port HC in FIG. 6 (g) moves through the in-valve flow path 63, flows out from the port B2 and the port HE in FIG. 6 (i), and flows into the port HC in FIG. 6 (h). The cooling water that has flowed in through the valve moves through the valve flow path 63 and flows out from the port B2 and the port HE in FIG. 6 (i). The 5-port water control valve can manage the temperature of the coolant on the outlet side of the engine 20 and the temperature of the lubricating oil by using the radiator 10. The 5-port water control valve can mix the cooling water flowing in from the port HC and the cooling water flowing in from the port RA, and the cooling water flowing out from the port B2 and the cooling water flowing out from the port HE. It functions as a mixing / dispensing valve that can be dispensed to each other. The open / closed state of the 5-port water control valve is as shown in Table 1 below.

  According to Table 1, when the temperature Tw of the cooling water on the outlet side of the engine 20 is less than the first predetermined value V1, the total amount of the cooling water that has passed through the engine 20 is transferred to other devices (the radiator 10 and the heater core 40). Without passing (RA: CLOSE, HC: CLOSE, B2: CLOSE), it can be supplied to the heat exchanger 30 (B1: OPEN, HE: OPEN). While the engine 20 is warmed up, the temperature of the lubricating oil can be raised at an early stage, and the friction of the engine 20 can be reduced to improve the fuel efficiency.

  When the temperature Tw is equal to or higher than the first predetermined value V1 and the load state El of the engine 20 is low, cooling water is not supplied to the heat exchanger 30 (HE: CLOSE), and cooling is performed in the heat exchanger 30. Heat exchange between water and lubricant has been suspended. It can suppress that the temperature of lubricating oil falls more than needed, and can improve a fuel consumption.

  When the temperature Tw is equal to or higher than the first predetermined value V1 and the load state El of the engine 20 is equal to or higher than the medium load, the cooling water that has passed through the radiator 10 is supplied to the heat exchanger 30 (RA: OPEN, HE: OPEN). An excessive increase in the temperature of the lubricating oil can be suppressed, and deterioration of the lubricating oil can be suppressed.

  By the way, while the engine 20 is warmed up, the ECU (cooling water flow control device 60) of FIG. 1 may receive a heater operation request. When the temperature of the cooling water on the outlet side of the engine 20 is less than the first predetermined value and there is a heater operation request, the rotation angle of the valve body 52 (control amount of the valve unit 50) is, for example, 30 [degree]. ]. As a result, the closed port HC in FIG. 6A is opened (the ports RA and B2 remain closed). Therefore, the heater core (and the room) can be efficiently heated. When a heater operation request is received, the open / close state of the 5-port water control valve is as shown in Table 2 below.

  According to Table 2, when there is a heater operation request, the coolant is always supplied to the heater core 40 regardless of the coolant temperature Tw and the load state El of the engine 20 (HC: OPEN).

  FIG. 7 shows another schematic configuration example (second embodiment) of the cooling water flow control system according to the present invention. The valve unit 50 in FIG. 1 includes a first water control valve 70 (first valve) and a second water control valve 80 (second valve) in FIG. 7 instead of the 5-port water control valve in FIG. May be. In FIG. 7, in a bypass (a bypass circuit of a radiator circuit, a first bypass circuit) circuit, a heat exchanger circuit having a heat exchanger 30 and a bypass circuit for circulating cooling water bypassing the heat exchanger 30 ( A bypass circuit of the heat exchanger circuit, a second bypass circuit).

  The first water control valve 70 of FIG. 7 can take in the cooling water coming out of the radiator 10 and the cooling water coming out of the heater core 40 and can discharge the cooling water bypassing the heat exchanger 30. It is. The second water control valve 80 can take in a part of the cooling water flowing through the first bypass circuit and the cooling water bypassing the heat exchanger 30 and discharges the cooling water flowing into the heat exchanger 30. Is possible.

  The heat exchanger circuit having the heat exchanger 30 can return the cooling water flowing into the heat exchanger 30 to the second bypass circuit. Further, the second bypass circuit can return the remaining portion of the cooling water that bypasses the heat exchanger 30 to the engine 20 as the cooling water flowing through the second bypass circuit.

  When the temperature of the cooling water on the outlet side of the engine 20 is lower than the first predetermined value, the first water control valve 70 blocks intake of the cooling water coming out of the radiator 10 and the second water control valve 80. Shuts off the cooling water that bypasses the heat exchanger 30. In other words, the second water control valve 80 can supply cooling water to the heat exchanger 30, and thereby can efficiently heat the lubricating oil while warming up the engine 20. The first predetermined value means the end of warm-up of the engine 20, and the second predetermined value means an intermediate load state or a high load state (end of low load) of the engine 20.

  Next, when the temperature of the cooling water on the outlet side of the engine 20 is equal to or higher than the first predetermined value and the load state of the engine 20 is equal to or higher than the second predetermined value, the first water control valve 70 is set to the radiator 10. The second water control valve 80 maintains the discharge of the cooling water flowing into the heat exchanger 30 while maintaining the intake of the cooling water coming out of the heat exchanger 30. The second water control valve 80 can supply the cooling water coming out of the radiator 10 to the heat exchanger 30 via the first water control valve 70 and the pump 36, thereby increasing the temperature of the lubricating oil. Sometimes the lubricating oil can be efficiently cooled. In other words, the cooling water supplied to the heat exchanger 30 is sufficiently cooled by the radiator 10, and the cooling water is taken into the second water control valve 80.

  FIG. 8 shows a cross-sectional view of a specific configuration example (first water control valve 70) of the first valve constituting the valve unit 50 of FIG. Those skilled in the art should note that the first water control valve 70 of the valve unit 50 is not unduly limited by the embodiments described below. As shown in FIG. 8, the first water control valve 70 includes a valve box 51, a valve body 52, a valve lid 53, and a rotary actuator 54.

  8 has a port RA and a port HC. The valve body 52 has a first hole 65 and a second hole 66 corresponding to the port RA and the port HC, and a third hole 67 communicating with the port EN. The valve lid 53 has a port EN. The inside of the valve body 52 becomes a valve flow path 63.

  9 shows a sectional view taken along line 9-9 of FIG. As shown in FIG. 9, the valve box 51 has a port RA and a port HC, and the valve body 52 has a first hole 65 and a second hole 66 corresponding to the port RA and the port HC. However, in FIG. 9, the port RA and the port HC are closed by the valve body 52.

  10 (a) to 10 (b) are diagrams for explaining the operation of the first water control valve in FIG. The operation of the first water control valve 70 (first valve) of the valve unit 50 will be described below. FIG. 10A corresponds to FIG. 9, and in FIG. 10A, the port RA and the port HC are closed.

  When the temperature of the cooling water on the outlet side of the engine 20 is equal to or higher than the first predetermined value, the ECU (cooling water flow control device 60) in FIG. 1 moves the valve body 52 to 90 by the rotary actuator (FIG. 8, reference numeral 54). [Degree] can be turned. Then, as shown in FIG. 10B, the cooling water flowing in from the port RA and the port HC moves through the in-valve channel 63 and flows out from the port EN shown in FIG.

  FIG. 11 shows a cross-sectional view of a specific configuration example (second water control valve 80) of the second valve constituting the valve unit 50 of FIG. Those skilled in the art should note that the second water control valve 80 of the valve portion 50 is not unduly limited by the embodiments described below. As shown in FIG. 11, the second water control valve 80 includes a valve box 51, a valve body 52, and a rotary actuator 54.

  The valve box 51 of FIG. 11 has a port B1 and a port B2 that are arranged on the same axis, and a port HE that is arranged on an axis orthogonal to the axis passing through the port B1 and the port B2. The valve body 52 has an L-shaped in-valve flow path 63.

  12 (a) to 12 (c) are diagrams for explaining the operation of the second water control valve in FIG. The operation of the second water control valve 80 (second valve) of the valve unit 50 will be described below. In FIG. 12A, the port B1 and the port HE are open, and the port B2 is closed. The cooling water flowing in from the port B1 flows out from the port HE through the in-valve channel 63.

  When the temperature of the coolant on the outlet side of the engine 20 is equal to or higher than the first predetermined value and the load state of the engine 20 is lower than the second predetermined value, the ECU (cooling water flow control device 60) in FIG. The valve element 52 can be rotated 90 degrees in the counterclockwise direction by a rotary actuator (FIG. 11, reference numeral 54). Then, as shown in FIG. 12B, the port B2 and the port HE are closed by the valve body 52, and one end of the in-valve flow path 63 is also closed by the valve box 51. As a result, the ports B1, B2, and HE Everything is closed.

  Next, when the temperature of the cooling water on the outlet side of the engine 20 is equal to or higher than the first predetermined value and the load state of the engine 20 is equal to or higher than the second predetermined value, the ECU (cooling water flow control device) in FIG. 60) can rotate the valve body 52 by 90 [degree] in the counterclockwise direction by the rotary actuator (FIG. 11, reference numeral 54). Then, as shown in FIG. 12C, the port B2 and the port HE are opened, and the port B1 is closed. The cooling water flowing in from the port B2 flows out from the port HE through the in-valve channel 63. When the temperature of the lubricating oil rises, the lubricating oil can be efficiently cooled. In other words, the cooling water supplied to the heat exchanger 30 is sufficiently cooled by the radiator 10, and the cooling water is taken into the second water control valve 80 via the first water control valve 70. The open / close states of the first water control valve 70 and the second water control valve 80 are as shown in Table 3 below.

  According to Table 3, when the temperature Tw of the cooling water on the outlet side of the engine 20 is less than the first predetermined value V1, the total amount of the cooling water that has passed through the engine 20 is transferred to other devices (the radiator 10 and the heater core 40). Without passing (RA: CLOSE, HC: CLOSE, B2: CLOSE), the heat exchanger 30 can be supplied (B1: OPEN, HE: OPEN, EN: OPEN). When the temperature Tw is equal to or higher than the first predetermined value V1 and the load state El of the engine 20 is low, cooling water is not supplied to the heat exchanger 30 (HE: CLOSE), and cooling is performed in the heat exchanger 30. Heat exchange between water and lubricant has been suspended. When the temperature Tw is equal to or higher than the first predetermined value V1 and the load state El of the engine 20 is equal to or higher than the medium load, the cooling water that has passed through the radiator 10 is supplied to the heat exchanger 30 (RA: OPEN, HE: OPEN, EN: OPEN).

  By the way, while the engine 20 is warmed up, the ECU (cooling water flow control device 60) of FIG. 1 may receive a heater operation request. When the temperature of the cooling water on the outlet side of the engine 20 is less than the first predetermined value and there is a heater operation request, the rotation angle of the valve body 52 (control amount of the first water control valve 70) is, for example, 20 [degree]. As a result, the closed port HC in FIG. 10A is opened (the port RA remains closed). Therefore, the heater core (and the room) can be efficiently heated. When the heater operation request is received, the open / close states of the first water control valve 70 and the second water control valve 80 are as shown in Table 4 below.

  According to Table 4, when there is a heater operation request, the coolant is always supplied to the heater core 40 regardless of the coolant temperature Tw and the load state El of the engine 20 (HC: OPEN).

  The first embodiment employs the 5-port water control valve of FIG. 2 as the valve unit 50 of FIG. 1, and the second embodiment employs the first water control of FIGS. 8 and 11 as the valve unit 50 of FIG. A valve and a second water control valve are adopted. The valve unit 50 is not limited to these exemplary embodiments, and a part of the valve unit 50 (a mechanism corresponding to the port RA portion, the port B1 portion, the port B2 portion and / or the port HC portion) may be, for example, a thermostat. In other words, the 5-port water control valve of FIG. 2 may be a combination of an electric valve or device and a temperature sensitive valve or device. Good. Further, the 5-port water control valve in FIG. 2 that is an electric valve or device may include a plurality of actuators. In other words, the 5-port water control valve is a combination of a plurality of electric valves or devices. May be. Similarly, the first water control valve and the second water control valve of FIGS. 8 and 11 may be integrated, or may be a combination of an electric valve or device and a temperature sensitive valve or device. May be.

  The present invention is not limited to the above-described exemplary embodiments, and those skilled in the art will be able to easily modify the above-described exemplary embodiments to the extent included in the claims. .

  DESCRIPTION OF SYMBOLS 10 ... Radiator, 20 ... Engine, 24 ... Detection part, 30 ... Heat exchanger, 36 ... Pump, 40 ... Heater core, 50 ... Valve part, 60 ... Cooling water flow control device, 70 ... first water control valve (first valve), 80 ... second water control valve (second valve).

Claims (1)

A radiator circuit having a radiator, wherein a part of cooling water coming out of an engine is put into the radiator, and the cooling water coming out of the radiator is returned to the engine through a valve portion; and
A first bypass circuit that returns the other part of the cooling water coming out of the engine to the engine via the valve portion as cooling water that bypasses the radiator and flows through the first bypass circuit; ,
A heater core circuit having a heater core, wherein another part of the cooling water coming out of the engine is put into the heater core, and the cooling water coming out of the heater core is passed to the engine through the valve portion. Returning the heater core circuit; and
The cooling water coming out of the radiator, the cooling water flowing through the first bypass circuit, and the cooling water coming out of the heater core can be taken in, and the temperature of the lubricating oil of the engine is adjusted Cooling water flowing into a possible heat exchanger, and the valve part capable of discharging cooling water bypassing the heat exchanger;
With
When the temperature of the cooling water on the outlet side of the engine is less than a first predetermined value, the valve section cuts off the intake of the cooling water coming out of the radiator and bypasses the heat exchanger. Shut off the cooling water discharge,
When the temperature is equal to or higher than the first predetermined value and the load state of the engine is equal to or higher than a second predetermined value, the valve unit maintains the intake of the cooling water coming out of the radiator, And maintaining the discharge of the cooling water flowing into the heat exchanger,
The valve portion is
A first valve capable of taking in the cooling water coming out of the radiator and the cooling water coming out of the heater core and discharging the cooling water bypassing the heat exchanger;
The cooling water flowing through the first bypass circuit and a part of the cooling water bypassing the heat exchanger can be taken in, and the cooling water flowing into the heat exchanger can be discharged. Two valves,
Including
A heat exchanger circuit having the heat exchanger, the heat exchanger circuit returning the cooling water flowing from the second valve to the heat exchanger to a second bypass circuit;
As the cooling water flowing through the second bypass circuit, the second bypass circuit that returns another part of the cooling water that bypasses the heat exchanger to the engine;
Furthermore cooling water flow control system comprising: a.

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