JPS6320819Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an engine cooling water control device.

Generally speaking, an engine cooling water control device has a main cooling waterway that circulates cooling water between the engine and the radiator, and a heating waterway with a heater is formed as a branch, and uses the high temperature cooling water after the engine has been cooled to perform heating. It was designed to do this.

By the way, in general, in an engine, when the warm-up of the engine is completed, the temperature of the lubricating oil rises higher than that of the cooling water, and this is not favorable for engine performance, so it is necessary to cool the lubricating oil.
In a water-cooled engine, a water-cooled oil cooler can be provided in the cooling water control device to cool lubricating oil using engine cooling water. However, in this case, if the heater and oil cooler are arranged independently of each other, there will be a delay in warming up the engine, the performance of the heater will deteriorate, and the temperature of the lubricating oil and cooling water will deviate from the optimum temperature. This may cause problems such as reduced engine performance.

Therefore, as an engine cooling water control system that eliminates such problems, conventionally, a lubricating oil cooling waterway with a water-cooled oil cooler is branched from the upstream end of the heating waterway, and the cooling water is sent to the heater and oil cooler. There is a device that controls the flow rate of water (see Japanese Patent Application Laid-open No. 102941/1983).

By the way, in a water-cooled engine, after the engine is warmed up, the lubricating oil temperature a becomes higher than the cooling water temperature b, as shown in Figure 2. By utilizing this for heating, it is possible to further improve the performance of the heater.

This idea was developed based on the fact that the lubricating oil becomes hotter than the cooling water after the engine warms up, and a water-cooled oil cooler is installed in the heating waterway upstream of the heater. An object of the present invention is to provide an engine cooling water control device that can greatly improve the performance of a heater by guiding cooling water whose temperature has increased through an oil cooler to the heater.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an engine cooling water control system according to an embodiment of the present invention. In the figure, 1 is an engine, and 2 is a radiator. Between the engine 1 and the radiator 2, a main cooling water channel 3 for circulating cooling water is provided. A pump 4 for pumping cooling water is provided at the upstream end of the main cooling water channel 3, and a thermovalve 5 is provided at the downstream end. It is designed to be guided to the pump 4 via the radiator 2 or the bypass passage 3a.

One end of a heating waterway 6 is branched from the main cooling waterway 3 in the engine 1, and the other end of the heating waterway 6 is connected to the suction side of the pump 4 of the main cooling waterway 3. A heater 7 is interposed in the heating water channel 6, and a bypass passage 8 is formed by bypassing the heater 7, and a switching valve is provided at the connection between the upstream end of the bypass passage 8 and the heating water channel 6. 9 is provided. Furthermore, a water-cooled oil cooler 10 is disposed in the heating water channel 6 on the upstream side of the switching valve 9. Note that arrows A to H in the figure indicate the flow of cooling water.

Next, the operation will be explained.

When the engine 1 operates, cooling water is pumped through the main cooling waterway 3 in the direction of arrow A by the pump 4.
It passes through the inside of the engine 1 and cools the engine 1.
When the coolant heated through the engine 1 reaches the thermovalve 5, if the water temperature is high, the coolant is guided to the radiator 2 as shown by arrow B and cooled down. and if the water temperature is not so high, use arrow C.
As shown in the figure, the engine 1 is cooled by the cooling water being guided by the pump 4 and circulating between the engine 1 and the radiator 2 in this way.

At this time, a portion of the high temperature cooling water flowing inside the engine 1 flows into the heating water channel 6. When the heater 7 is operating, that is, when the switching valve 9 closes the bypass passage 8 side, a part of the high-temperature cooling water flows in the heating water channel 6 in the direction of arrows D, E, G, and H. The lubricating oil flows in the direction of the oil and returns to the pump 4, whereby the water-cooled oil cooler 10 cools the lubricating oil of the engine, and the heater 7 performs heating. Further, when the heater 7 is not operated, that is, when the switching valve 9 closes the heating water channel 6 on the heater 7 side, the upstream portion of the heating water channel 6 and the bypass passage 8 communicate with each other, and the cooling water is As shown by arrows D, F, G, and H, the lubricating oil returns to the pump 4 through the heating water channel 6, the bypass passage 8, and the heating water channel 6 upstream from the switching valve 9, and only the lubricating oil is cooled.

In the device of this embodiment as described above, a water-cooled oil cooler is provided in the heating waterway upstream of the heater, so after the engine is warmed up, the cooling water heated by the engine is further transferred to the oil cooler. The cooling water is heated to a high temperature and is led to the heater, which greatly improves the performance of the heater. Also, while the engine is warming up, the temperature of the lubricating oil is lower than the temperature of the coolant (see Figure 2), so if the coolant is led to the water-cooled oil cooler during this warm-up, the coolant will be cooled by the lubricating oil. However, this warm-up time is relatively short, and there is no problem in practice even if the cooling water is led to the oil cooler as described above.

FIG. 3 shows a second embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same elements as in the same figure. However, in this embodiment, a bypass passage 11 is formed in the heating waterway 6 by bypassing the water-cooled oil cooler 10, and a thermovalve 12 is provided at the connection between the upstream end of the bypass passage 11 and the heating waterway 6. There is.

Next, the effects will be explained.

In this device, as in the above embodiment, the performance of the heater 7 can be greatly improved, and furthermore, the function of the thermo valve 12 allows the cooling water to flow through the bypass passage 11 during engine warm-up, and after the engine warm-up. flows through the oil cooler 10, so the cooling water is not cooled by lubricating oil during warm-up, there is no delay in warm-up of the engine, and furthermore, the performance of the heater during warm-up is improved. can be done.

Note that the present invention is not limited to the above embodiments, and various modifications and changes are possible. For example, the switching valve 9 may be provided at the connection between the downstream end of the bypass passage 8 and the heating waterway.

As described above, according to the engine cooling water control device according to the present invention, a water-cooled oil cooler is provided in the heating waterway upstream of the heater, and the cooling water whose temperature has increased is supplied to the heater through the oil cooler. This has the effect of greatly improving the performance of the heater, especially after the engine has warmed up, while maintaining engine performance.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an engine cooling water control device according to an embodiment of the present invention, and FIG. 2 is a diagram showing temporal changes in engine lubricating oil and cooling water temperatures.
FIG. 3 is a schematic diagram of another embodiment of the present invention. 1...Engine, 2...Radiator, 3...Main cooling waterway, 6...Heating waterway, 7...Heater, 8
...Bypass passage, 9...Switching valve, 10...Water-cooled oil cooler.

Claims (1)

[Scope of utility model registration request] A main cooling waterway that circulates cooling water between the radiator and the engine, and a branch formed in the middle of the main cooling waterway so that the cooling water heated to high temperature by the engine is returned to the main cooling waterway via the heater. In the engine cooling water control device, the engine cooling water control device includes a heating water channel that bypasses the heater and is provided in the heating water channel; a switching valve that switches the heating water to either the heater or the bypass passage, and a switching valve that is provided in the heating waterway upstream of the connection between the upstream end of the bypass passage and the heating waterway, and that cools the lubricating oil of the engine with the cooling water. An engine cooling water control device comprising a water-cooled oil cooler.