JPH0214525B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an engine cooling water temperature control device,
In particular, the present invention relates to an engine coolant temperature control device suitable for maintaining the coolant temperature of a vehicle engine at a set value.

[Background of the invention]

2. Description of the Related Art In order to perform various performance tests on engines for vehicles such as automobiles, devices have been proposed for constantly maintaining the temperature of engine cooling water at a set temperature. This device is configured to cool engine cooling water so that the temperature of the cooling water supplied to the engine or the cooling water discharged from the engine is always at a set temperature. That is, the engine naturally generates heat during operation, and the work loss is consumed as heat in the engine cooling water, causing the temperature of the engine cooling water to rise. Therefore, in order to always maintain the temperature of the cooling water discharged from the engine at a certain set temperature, if the temperature of the engine cooling water rises by, for example, △t due to heat generation from the engine,
△ than the engine cooling water discharged from the engine
It is necessary to supply the engine with cooling water whose temperature is lower by t. In this way, various engine coolant temperature control devices have been proposed that cool the engine coolant according to the temperature of the engine coolant in order to always maintain the temperature of the engine coolant at a set temperature.

For example, a tank with a heat exchanger function and an engine are connected via piping to form a cooling water circulation system,
Connect a pipe that injects cooling water from a separate system into the tank, and place a solenoid valve in the middle of this pipe to open and close the pipe so that the temperature of the engine cooling water discharged from the engine is at the set temperature. There is a device that supplies cooling water in a tank to the engine by opening and closing a solenoid valve.

In addition, as another device, in addition to the engine cooling water circulation system of the above device, another cooling water supply system is connected to the cooling water supply system that supplies cooling water from the tank to the engine, and the cooling water by this system is connected. The system mixes high-temperature cooling water supplied to the engine from a tank, supplies the mixed cooling water to the engine, and opens and closes a solenoid valve so that the temperature of the cooling water discharged from the engine reaches the set temperature. There is a device.

However, in the case of the former device, the cooling water is simply injected into the tank, and the cooling water that absorbs heat from the engine and returns to the tank is simply discharged into the tank. The temperature distribution of the cooling water inside the engine becomes uneven, making it difficult to accurately maintain the temperature of the cooling water supplied to the engine at a constant value.

In addition, in the case of the latter device, when the solenoid valve opens, low-temperature cooling water is suddenly supplied to the engine.
When the solenoid valve closes, only the high-temperature cooling water temporarily stored in the tank is supplied to the engine, making it impossible to precisely maintain the temperature of the cooling water supplied to the engine at the set value. .

Therefore, a device has been proposed that eliminates the above-mentioned problems and controls the cooling water temperature with high precision.

For example, as shown in FIG. 1, this device supplies steam from a heated steam supply system 12 into a tank 10 that stores engine cooling water, and also supplies engine cooling water in the tank 10 to the engine. 14 and returns this engine cooling water into the tank 10, the engine cooling water circulation system 16 includes:
A cooling water supply system 18 that supplies cooling water is provided to an engine cooling water supply system that supplies cooling water in the tank 10 to the engine 14, and an engine cooling water supply system 18 that supplies cooling water between the tank 10 and the engine 14. Thermocouples 24 and 2 are installed in the system 20 and the engine coolant discharge system 22, respectively.
6 and the detection output of thermocouples 24 and 26 as PID
The controller 28 inputs heated steam from the heated steam supply system 12 or cooling water from the cooling water supply system 18 to the engine cooling water circulation system 16 according to the temperatures of the engine cooling water supply system 20 and the engine cooling water discharge system 22. The engine cooling water supplied to the engine 14 is maintained at a set temperature.

However, in the case of the device shown in FIG. 1, the temperature distribution of the cooling water in the tank 10 is not uniform, so the temperature on the cooling water outlet side of the engine 14 is adjusted to about ±2°C of the set value, or It was only possible to control the temperature of the cooling water at the engine cooling water inlet side to about ±5° C. of the set value.

By the way, in recent years, as the development of small, high-performance engines has progressed, more accurate measurements and evaluations of various engine performances on engine test benches have been required, and the accuracy of engine cooling water temperature control has also increased. High precision is required.
Therefore, the control accuracy of the device shown in FIG.
The influence on engine performance cannot be ignored, and an engine coolant temperature control device with excellent control accuracy is required.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to equalize the temperature distribution of engine cooling water in a tank that stores engine cooling water in an engine cooling water circulation system, and to distribute the engine cooling water to the engine. An object of the present invention is to provide an engine cooling water temperature control device that can maintain the temperature of engine cooling water with high precision with respect to a set value.

[Summary of the invention]

In order to achieve the above object, the present invention supplies engine cooling water in a tank that stores engine cooling water to the engine, and returns this engine cooling water to the tank according to the temperature of the engine cooling water in the engine cooling water circulation system. In an engine cooling water temperature control device that takes heated steam from a heated steam supply system or cooling water from a cooling water supply system into a tank and maintains the temperature of the engine cooling water supplied to the engine at a set value, A pipe for introducing steam or cooling water into the tank is arranged from the top to the bottom of the tank, and in the middle of the pipe, a plurality of fluid inlets are arranged at equal intervals with the fluid injection direction facing the circumferential direction of the side wall of the tank. A pipe for introducing engine cooling water from the engine into the tank is arranged from the top of the tank to the bottom, and in the middle of the pipe, the engine cooling water injection direction is directed in the circumferential direction of the side wall of the tank, and A plurality of engine cooling water inlets facing the same direction as the fluid inlet group are formed at equal intervals corresponding to each fluid inlet, so that the fluid from each fluid inlet and the engine cooling water inlet from each engine cooling water inlet are An outlet for discharging the engine cooling water along the flow of the engine cooling water generated by mixing with the engine cooling water is formed on the bottom side wall of the tank along the circumferential tangential direction, and the engine cooling water is discharged from this outlet. It is characterized by supplying water to the engine.

[Embodiments of the invention]

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 2 shows the configuration of a preferred embodiment of the invention.

In FIG. 2, a cooling water supply system 30 that supplies cooling water, and a heating steam supply system 3 that supplies heating steam.
Solenoid valves 34 and 36 are provided at the ends of the cooling water supply system 30 and the heating steam supply system 3, respectively.
2 are coupled to a pipe 38 via electromagnetic valves 34 and 36, respectively. The pipe 38 is disposed from the top to the bottom of a cooling water tank 40 that stores engine cooling water, and a silencer 42 is disposed at the upper part of the pipe. From the lower part of this silencer 42 to the bottom of the pipe 38, a third
As shown in the figure, a shower nozzle 44 is formed, which constitutes a plurality of fluid inlets with the fluid inlet direction facing in the circumferential direction of the side wall of the cooling water tank 40.
The shower nozzles 44 are formed at approximately equal distances, and the heated steam or cooling water supplied to the pipe 38 via the solenoid valve 34 or 36 is distributed equally from each shower nozzle 44 into the cooling water tank 40. Can be injected.

In addition, in order to configure the engine cooling water circulation system,
The cooling water tank 40 and the engine 46 are connected to the piping 48,
50, and the cooling water tank 40
The cooling water inside is fed to the engine 46 via piping 48. The engine cooling water supplied to the engine 46 is returned to the cooling water tank 40 via the piping 50 by operation of a water pump (not shown) in the engine 46 . Thermocouples 52 and 54 are disposed in the middle of the pipes 48 and 50, respectively, and the output of each thermocouple 52 and 54 is switched to the switch 5.
6 to the PID controller 58.

Further, in this embodiment, a pipe 60 connected to the pipe 50 is arranged from the top to the bottom of the cooling water tank 40, and in the middle of the pipe 60, there is a pipe 60 connected to the pipe 50.
A shower nozzle 62 constitutes a plurality of engine cooling water inlets whose engine cooling water injection direction is directed in the circumferential direction of the side wall of the cooling water tank 40 and in the same direction as the shower nozzle 44, as shown in FIG.
is formed. The shower nozzles 62 are arranged at equal intervals, and the engine cooling water fed to the pipe 60 is evenly injected into the cooling water tank 40 from each shower nozzle 62. Therefore, in this embodiment, when heated steam or cooling water is injected into the cooling water tank 40 from each shower nozzle 44 and engine cooling water is injected from each shower nozzle 62, it is injected from each shower nozzle 44. A vortex is generated in the cooling water tank 40 due to the mixing of the fluid injected with the engine cooling water injected from each shower nozzle 62, and the engine cooling water and the cooling or heating medium are mixed smoothly. In order to more smoothly mix the engine cooling water and the cooling or heating medium, in this embodiment, as shown in FIG. A discharge port 64 for discharging the engine cooling water is formed at the bottom of the cooling water tank 40, and the engine cooling water discharged from the discharge port 64 is fed to the engine 46 via a pipe 48.

As described above, in this embodiment, a vortex is generated in the cooling water tank 40 by the cooling or heating medium injected from each shower nozzle 44 and the engine cooling water injected from each shower nozzle 62.
Further, the engine cooling water mixed with the cooling or heating medium is discharged along the circumferential tangential direction of the cooling water tank 40 through the discharge port 64, and a vortex is generated by the suction negative pressure of the water pump of the engine 46. is promoted, and the cooling water in the cooling water tank 40 becomes a laminar flow. Therefore, the engine cooling water injected from each shower nozzle 62 and the cooling or heating medium injected from each shower nozzle 44 are smoothly mixed, and the temperature distribution of the cooling water in the cooling water tank 40 is made uniform. be able to.

In the embodiment described above, an overflow pipe 66 which also serves as a support for the cooling water tank 40 is provided in the cooling water tank 40, and when the engine cooling water in the cooling water tank 40 exceeds a set level, the drain pipe 68 is disposed. The engine cooling water in the cooling water tank 40 is maintained at a constant level.

In the embodiment described above, a silencer 42 is disposed in the middle of the pipe 38, and when heated steam is supplied from the heated steam supply system 32 into the pipe 38, the silencer 42 directs the heated steam into the engine cooling water. Since the water is directly blown into the engine cooling water tank 40,
It is possible to suppress the generation of air bubbles inside.

Further, in the above embodiment, the PID controller 5
When the changeover switch 56 is actuated and the thermocouple 52 is selected by the command from the thermocouple 52 or 5.
The detection output of 4 is sent to the PID controller 58, and the temperature of the engine cooling water flowing through the pipes 48 and 50 is detected. Then, in order to maintain the temperature of the engine cooling water circulation system at a set value, a control output is given from the PID controller 58 to the solenoid valve 34 of the cooling water supply system 30 or the solenoid valve 36 of the heated steam supply system 32, and the solenoid valve 34 Alternatively, cooling water or heated steam is supplied to the pipe 38 by opening and closing the pipe 36. Therefore, the cooling or heating medium mixes with the engine cooling water in the cooling water tank 40, and the temperature of the engine cooling water in the cooling water tank 40 can be maintained at a constant value.

For example, if the temperature on the exhaust port side of the engine 46 is t°C
For example, since the engine 46 generates heat during operation, the temperature of the cooling water on the engine cooling water outlet side becomes higher than that on the engine cooling water intake side. Therefore, the thermocouple 54 detects that the temperature on the discharge port side has become higher than t°C. Therefore, the PID controller 58 controls the opening/closing operation of the solenoid valve 34 according to the deviation between the detected temperature and the set value t° C., and supplies the cooling water from the cooling water supply system 30 into the cooling water tank 40 .

Conversely, when the load on the engine 46 decreases, the heat generated by the engine 46 itself also decreases. At this time, if the temperature detected by the thermocouple 54 becomes lower than the set value t°C, the PID controller 58 controls the solenoid valve 36 according to the deviation between the temperature detected by the thermocouple 54 and the set value. The heating steam from the heating steam supply system 32 is fed into the cooling water tank 40 through the pipe 38.

By repeating the above control, the engine 4
The temperature on the discharge port side of No. 6 can be maintained at the set temperature.

Also, engine 46 is constant at 4000 rpm, load -120
When an experiment was conducted using the apparatus of this embodiment to maintain the temperature on the exhaust port side of the engine 46 at 78°C while operating at mmHg, it was found that the fluctuation range of the temperature on the intake port side of the engine 46 was 0.3°C. , the temperature fluctuation range on the exhaust port side of the engine 46 could be maintained at 0.5°C. In addition, under the same conditions as above, the first
When an experiment was conducted using the apparatus shown in the figure, the fluctuation range of the temperature on the intake side of the engine 14 was 10°C.
The temperature fluctuation range on the discharge port side was 1°C.

〔Effect of the invention〕

As explained above, according to the present invention, the cooling or heating medium taken into the cooling water tank,
The engine cooling water discharged from the engine forms a laminar flow in the cooling water tank and mixes, so the temperature distribution of the fluid in the cooling water tank can be made uniform, and the engine cooling water is sent to the engine. This has the excellent effect of being able to control the temperature at a set temperature with high precision.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional device, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a sectional view taken along the line - shown in FIG. 30...Cooling water supply system, 32...Heating steam supply system, 34, 36...Solenoid valve, 38...Pipe, 40...
...Cooling water tank, 42...Silencer, 44,6
2...Shower nozzle, 46...Engine, 5
2, 54...Thermocouple, 58...PID controller.

Claims (1)

[Claims] 1 Heating from the heating steam supply system is determined according to the temperature of the engine cooling water in the engine cooling water circulation system, which supplies the engine cooling water in the tank that stores the engine cooling water to the engine and returns this engine cooling water into the tank. In an engine cooling water temperature control device that takes cooling water from the steam or cooling water supply system into the tank and maintains the temperature of the engine cooling water supplied to the engine at a set value, heated steam or cooling water is introduced into the tank. A intake pipe is arranged from the top of the tank to the bottom, and a plurality of fluid inlets are formed at equal intervals in the middle of the pipe, with the fluid injection direction facing the circumferential direction of the tank side wall. A pipe for introducing cooling water into the tank is arranged from the top to the bottom of the tank, and in the middle of the pipe, the engine cooling water is injected in the circumferential direction of the side wall of the tank, and in the same direction as the fluid inlet group. A plurality of engine cooling water inlets facing each other are formed at equal intervals in correspondence with each fluid inlet. A discharge port for discharging the engine coolant along the flow of the engine coolant is formed on the bottom side wall of the tank along the tangential direction of its circumference, and the engine coolant discharged from this discharge port is supplied to the engine. An engine cooling water temperature control device featuring: