JP7139592B2 - cooling system - Google Patents

Description

The present invention relates to vehicle cooling systems.

2. Description of the Related Art Some vehicles such as trucks have a cooling system provided with two cooling channels through which cooling water flows. Specifically, the cooling system is provided with a main cooling passage in which cooling water circulates between the main radiator and the engine, and a sub cooling passage in which cooling water circulates between the water-cooled intercooler and the sub radiator. ing.

JP 2010-65544 A

In order to circulate the cooling water so as to ensure the cooling performance of the radiator in the main cooling passage and the sub cooling passage, a configuration is adopted in which a dedicated pump is provided for each of the independent main cooling passage and the sub cooling passage. sell. However, with the above configuration, the number of parts increases, leading to an increase in cost.

Accordingly, the present invention has been made in view of these points, and it is an object of the present invention to appropriately circulate cooling water in two systems of cooling passages with a simple configuration.

In one aspect of the present invention, a first cooling passage in which cooling water circulates between an engine and a main radiator; a pump provided in the first cooling passage for circulating the cooling water; a second cooling passage that is connected to the cooling passage and in which cooling water circulates between the water-cooled intercooler and the sub radiator; and a detour passage that bypasses the sub radiator in the second cooling passage; a flow rate adjustment unit that adjusts the flow rate of cooling water flowing through the detour channel, wherein the pump directs the cooling water from the first cooling channel to the second cooling channel, and the second cooling channel A cooling system is provided in which cooling water is circulated in the second cooling channel by returning cooling water from the channel to the first cooling channel.
According to the cooling system configured as described above, the cooling water flowing through not only the first cooling flow path but also the second cooling flow path is circulated by a single pump. parts cost can be reduced. Further, by providing the flow rate adjusting section, the flow of the cooling water circulating through the second cooling flow path can be adjusted by the pump.

Further, the second cooling flow path is connected to the downstream side of the pump in the first cooling flow path, and an inflow portion into which cooling water flows from the first cooling flow path; An outflow part connected to the upstream side of the pump and through which cooling water flows out to the first cooling flow path may be provided.

A first water-cooled intercooler and a second water-cooled intercooler are provided in the second cooling passage, and the pump supplies cooling water that has passed through the first water-cooled intercooler and the second water-cooled intercooler. The cooling water that has passed through the water-cooled intercooler may be returned to the first cooling flow path.

Further, the flow path adjustment unit may adjust the flow rate of cooling water flowing through the bypass path according to the load of the engine.

Advantageous Effects of Invention According to the present invention, it is possible to appropriately circulate cooling water in two systems of cooling passages with a simple configuration.

1 is a schematic diagram showing an example of a configuration of a cooling system 1 according to one embodiment of the present invention; FIG. 5 is a schematic diagram for explaining the flow of cooling water in the main cooling channel 50. FIG. 6 is a schematic diagram for explaining the flow of cooling water in the sub-cooling channel 60. FIG.

<Configuration of cooling system>
A configuration of a cooling system according to one embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.

FIG. 1 is a schematic diagram showing an example of the configuration of a cooling system 1 according to one embodiment. FIG. 2 is a schematic diagram for explaining the flow of cooling water in the main cooling channel 50. As shown in FIG. FIG. 3 is a schematic diagram for explaining the flow of cooling water in the sub-cooling flow path 60. As shown in FIG. In FIG. 1, the intake passage 20, the exhaust passage 30 and the EGR passage 40 are indicated by solid lines, the main cooling passage 50 is indicated by broken lines, and the sub cooling passage 60 is indicated by dashed lines. 2 and 3 show only part of the configuration shown in FIG. 1 for convenience of showing the flow of cooling water.

A cooling system 1 is mounted on a vehicle (for example, a truck) and cools cooling water with a radiator. As shown in FIG. 1, the cooling system 1 includes an engine 10, an intake passage 20, an exhaust passage 30, an EGR passage 40, a main cooling passage 50, a sub cooling passage 60, and a control section 90. have.

The engine 10 is a prime mover that combusts and expands a mixture of fuel and intake air to generate power for driving the vehicle. The engine 10 is here a diesel engine, but could also be a gasoline engine.

The intake passage 20 is a passage that supplies intake air to the engine 10 . The intake passage 20 is provided with a first compressor 22a of the first supercharger 22, a first water-cooled intercooler 23, a second compressor 24a of the second supercharger 24, and a second water-cooled intercooler 25. . Note that the first supercharger 22 and the second supercharger 24 are turbochargers that supercharge the intake air supplied to the engine 10, and two superchargers are provided to increase the supercharging efficiency. .

The first compressor 22a compresses intake air that has passed through, for example, an air cleaner. The first water-cooled intercooler 23 cools, with cooling water, the intake air that has been compressed by the first compressor 22a and raised in temperature. The second compressor 24 a compresses the intake air that has passed through the first water-cooled intercooler 23 . The second water-cooled intercooler 25 cools the intake air, whose temperature has been increased by being compressed by the second compressor 24a, with cooling water. As a result, the intake air supercharged in two stages is sent to the engine 10 .

The exhaust passage 30 is a passage for discharging exhaust gas from the engine 10 to the outside of the vehicle. A first turbine 22 b of the first supercharger 22 , a second turbine 24 b of the second supercharger 24 , and an aftertreatment section 32 are provided in the exhaust passage 30 .

The second turbine 24b receives the energy of the exhaust gas from the engine 10 and rotates to supercharge the intake air to the second compressor 24a. The first turbine 22b rotates with the energy of the exhaust gas that has passed through the second turbine 24b, thereby supercharging the intake air to the first compressor 22a. The aftertreatment unit 32 is a device for purifying exhaust gas, and includes, for example, DPF (Diesel Particulate Filter) and SCR (Selective Catalytic Reduction).

The EGR passage 40 connects between the exhaust passage 30 and the intake passage 20 and is a recirculation passage that recirculates part of the exhaust gas flowing through the exhaust passage 30 to the intake passage 20 . An EGR cooler 42 that cools the exhaust gas is provided in the EGR passage 40 .

The main cooling flow path 50 is a flow path through which cooling water for cooling the engine 10 flows. The main cooling passage 50 is provided with a main radiator 52, a pump 53, a three-way valve 54, and a valve 55, as shown in FIG. The main cooling passage 50 circulates cooling water between the engine 10 and the main radiator 52, as shown in FIG.

The main radiator 52 is provided in the front part of the vehicle. The main radiator 52 cools the cooling water by exchanging heat between the cooling water flowing through the main cooling passage 50 and air (for example, running wind). Cooling water cooled by the main radiator 52 is sent to the engine 10 as shown in FIG.

The pump 53 is provided between the engine 10 and the main radiator 52 in the main cooling passage 50 and draws in and pumps out cooling water so that the cooling water circulates between the engine 10 and the main radiator 52 . The cooling water sent out by the pump 53 flows to the engine 10 and the EGR cooler 42 as shown in FIG.

The three-way valve 54 is a valve having inlets and outlets for cooling water in three directions, and is provided on the outlet side of the engine 10 in the main cooling flow path 50 . The three-way valve 54 divides the cooling water from the engine 10 to the main radiator 52 and the pump 53, as shown in FIG. The three-way valve 54 may be, for example, a thermostat that adjusts the degree of opening according to the temperature of cooling water.

A valve 55 is provided between the EGR cooler 42 and the pump 53 in the main cooling passage 50 . The valve 55 adjusts the flow rate of cooling water flowing from the EGR cooler 42 to the pump 53, for example.

The sub-cooling channel 60 is a channel through which cooling water flows, and is connected to the main cooling channel 50 . The secondary cooling channel 60 is provided with a secondary radiator 62, a detour channel 63, a three-way valve 64, an inflow portion 65, an outflow portion 66, and a valve 67, as shown in FIG. The sub-cooling flow path 60 circulates cooling water between the first water-cooled intercooler 23, the second water-cooled intercooler 25 and the sub-radiator 62, as shown in FIG. Note that the flow rate of cooling water flowing through the sub-cooling flow path 60 is much smaller than the flow rate of cooling water flowing through the main cooling flow path 50 .

The sub radiator 62 is provided in front of the main radiator 52 as shown in FIG. The sub radiator 62 cools the cooling water by exchanging heat between the cooling water flowing through the sub cooling flow path 60 and air (for example, running wind). The cooling water cooled by the sub radiator 62 is sent to the first water-cooled intercooler 23 and the second water-cooled intercooler 25, as shown in FIG.

The detour channel 63 is a channel provided to bypass the sub radiator 62 in the sub cooling channel 60 . For example, when the engine 10 is warmed up, cooling water flows through the bypass passage 63 .

The three-way valve 64 is a valve having inlets and outlets for cooling water in three directions, and is provided on the outlet side of the sub radiator 62 in the sub cooling flow path 60 . In addition, the three-way valve 64 is provided at the confluence portion of the bypass channel 63 with the sub-cooling channel 60 . The three-way valve 64 is a flow rate adjusting unit that adjusts the flow rate of cooling water flowing through the secondary radiator 62 and the flow path of cooling water flowing through the bypass flow path 63 . For example, the three-way valve 64 adjusts the flow rate of cooling water flowing through the bypass passage 63 according to the load of the engine 10 . In addition, the three-way valve 64 does not allow cooling water to flow to the auxiliary radiator 62 when the engine 10 is warmed up. The three-way valve 64 may be a thermostat that adjusts the degree of opening according to the temperature of cooling water, for example. In the above description, the three-way valve 64 is provided on the outlet side of the sub-cooling flow path 60. However, the present invention is not limited to this. may

The inflow portion 65 is a connection portion with the main cooling channel 50 and allows cooling water to flow from the main cooling channel 50 into the sub cooling channel 60 . The inlet portion 65 is positioned downstream of the pump 53 in the main cooling channel 50 . The cooling water flowing from the main cooling passage 50 flows toward the sub radiator 62 as shown in FIG.

The outflow portion 66 is a connection portion with the main cooling channel 50 and allows the cooling water to flow out from the sub cooling channel 60 to the main cooling channel 50 . The outflow portion 66 is located upstream of the pump 53 in the main cooling passage 50 . In addition, as shown in FIG. 3 , the cooling water that has passed through the first water-cooled intercooler 23 and the second water-cooled intercooler 25 flows to the outflow portion 66 .

The valve 67 is provided on the outlet side of the first water-cooled intercooler 23 in the sub-cooling flow path 60 . The valve 67 adjusts the flow rate of cooling water flowing from the first water-cooled intercooler 23 to the outflow portion 66, for example.

By the way, unlike the main cooling channel 50 in which the pump 53 is provided, the sub cooling channel 60 is not provided with a pump. Cooling water flowing through the sub-cooling flow path 60 is circulated by the pump 53 . That is, when the pump 53 operates, the cooling water in the main cooling channel 50 is sent to the sub-cooling channel 60 through the inflow part 65, and the cooling water flowing through the sub-cooling channel 60 flows through the outflow part 66. It is returned to the main cooling channel 50 . By not providing a pump in the sub-cooling flow path 60 in this way, the cost of parts can be reduced, and the maintenance of the pump can be reduced.

Further, by providing the three-way valve 64 described above, the flow of cooling water circulating through the sub-cooling flow path 60 can be adjusted by the pump 53 . For example, the three-way valve 64 adjusts the flow rate of cooling water cooled by the auxiliary radiator 62 according to the load of the engine 10 . For example, the three-way valve 64 reduces the flow rate of cooling water when the load on the engine 10 is low, and increases the flow rate of cooling water when the load on the engine 10 is high. As a result, deterioration of intake air temperature can be suppressed. Further, when the engine 10 is warmed up, the three-way valve 64 causes the cooling water to flow through the bypass passage 63, thereby suppressing the cooling of the cooling water by the auxiliary radiator 62, thereby promoting the warming up.

The control unit 90 is an electronic control unit including a microcomputer having a CPU, ROM, RAM, etc., and controls the entire operation of the cooling system 1 . The control unit 90 controls operations of the pump 53, the three-way valve 54, the valve 55, the three-way valve 64, and the valve 67 according to the operating state of the engine 10 and the like. For example, the control unit 90 controls the operation of the three-way valve 64 according to the load of the engine 10 and the warm-up state of the engine 10 to adjust the cooling of the cooling water by the auxiliary radiator 62 .

<Effects of this embodiment>
In the cooling system 1 described above, the main cooling channel 50 is provided with the pump 53 , while the sub cooling channel 60 is not provided with the pump. Then, the pump 53 directs cooling water from the main cooling channel 50 to the secondary cooling channel 60 and returns cooling water from the secondary cooling channel 60 to the primary cooling channel 50 . The secondary cooling channel 60 is provided with a bypass channel 63 that bypasses the secondary radiator 62 and a three-way valve 64 that adjusts the flow rate of cooling water flowing through the bypass channel 63 .
According to the above configuration, the cooling water flowing through not only the main cooling passage 50 but also the sub-cooling passage 60 is circulated by the single pump 53, thereby eliminating the need to provide a dedicated pump for the sub-cooling passage 60. This eliminates the need for parts, reducing the cost of parts. Further, by providing the three-way valve 64, the flow of cooling water circulating through the sub-cooling flow path 60 can be adjusted by the pump 53. FIG. As described above, according to the cooling system 1 of the present embodiment, it is possible to appropriately circulate the cooling water in the main cooling flow path 50 and the sub cooling flow path 60 with a simple configuration.

In the above description, two superchargers and two water-cooled intercoolers are provided, but the present invention is not limited to this. For example, one supercharger and one water-cooled intercooler may be provided.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist thereof. be. For example, the specific embodiment of the distributed/integrated device is not limited to the above-described embodiments, and all or part of it may be functionally or physically distributed/integrated in arbitrary units. can be done. Further, new embodiments resulting from arbitrary combinations of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment caused by the combination has the effect of the original embodiment.

1 cooling system 10 engine 23 first water-cooled intercooler 25 second water-cooled intercooler 50 main cooling channel 52 main radiator 53 pump 60 sub-cooling channel 62 sub-radiator 63 detour channel 64 three-way valve 65 inlet 66 outlet

Claims (4)

a first cooling passage connecting an engine and a main radiator, through which cooling water circulates between the engine and the main radiator;
a pump provided in the first cooling channel for circulating the cooling water;
a second cooling channel connected to the first cooling channel and through which cooling water circulates between the water-cooled intercooler and the sub radiator;
a detour passage that bypasses the sub radiator in the second cooling passage;
a flow rate adjusting unit that adjusts a flow rate of cooling water flowing to the sub radiator and a flow rate of cooling water flowing through the detour channel;
with
The pump directs the cooling water from the first cooling passage to the second cooling passage and returns the cooling water from the second cooling passage to the first cooling passage, thereby performing the second cooling. circulating the cooling water in the flow path without passing through the engine;
The flow rate adjustment unit prevents cooling water from flowing to the secondary radiator when the engine is warmed up.
cooling system. The second cooling flow path is connected to the downstream side of the pump in the first cooling flow path and has an inflow portion into which cooling water flows from the first cooling flow path, and the pump in the first cooling flow path. and an outflow part connected to the upstream side of the and through which the cooling water flows out to the first cooling flow path,
A cooling system according to claim 1 . A first water-cooled intercooler and a second water-cooled intercooler are provided in the second cooling flow path,
The pump returns the cooling water that has passed through the first water-cooled intercooler and the cooling water that has passed through the second water-cooling intercooler to the first cooling flow path,
3. A cooling system according to claim 1 or 2. The flow rate adjustment unit adjusts the flow rate of cooling water flowing through the detour channel according to the load of the engine.
4. A cooling system according to any one of claims 1-3.

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