JPS6036717A - Apparatus for controlling temperature of engine cooling water - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an engine cooling water temperature control device, and particularly to an engine cooling water temperature control device suitable for maintaining the cooling water temperature of a vehicle engine at a set value. Regarding equipment.

[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 the engine coolant so that the temperature of the coolant supplied to the engine or the coolant discharged from the engine is always at a set temperature. That is, the engine naturally generates heat during operation, and the resulting loss f is consumed in the engine cooling water as heat 11 and i~, increasing the temperature of the engine cooling water. 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 increases by, for example, △t due to engine heat generation, the engine cooling water discharged from the engine must be It is necessary to supply the engine with cooling water whose temperature is Δt lower than that of water. In this way, in order to always keep the temperature of the engine coolant at a set temperature, an engine coolant temperature control device that cools the engine coolant according to the temperature of the engine coolant is proposed for each rod. There is.

For example, a tank with a heat exchanger function and an engine are connected with piping to form a cooling water circulation system, and a pipe for injecting cooling water from a separate system into the tank is connected. There is a device that is equipped with a solenoid valve that opens and closes a passage, and opens and closes the solenoid valve so that the temperature of engine cooling water discharged from the engine reaches a set temperature, supplying cooling water in the tank to the engine. .

In addition, in another device and 12, apart from the engine cooling water circulation system of the 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 by this system is Water and high-temperature cooling water supplied to the engine from the tank are mixed, the mixed cooling water is sent to the engine, and the solenoid valve is opened and closed so that the temperature of the cooling water discharged from the engine reaches the set temperature. There is a device g.

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. If the temperature distribution of the cooling water inside is uneven,
It is 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 rapidly supplied to the engine, and when the solenoid valve closes, only the high-temperature cooling water temporarily stored in the tank is supplied. Since the cooling water is supplied to the engine, the temperature of the cooling water supplied to the engine cannot be accurately maintained at the set value.

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

For example, as shown in FIG. 1, this device includes a heated steam supply system 12 in a tank 10 that stores engine cooling water.
An engine cooling water circulation system 1 for supplying steam from the tank 10 to the engine 14, and for supplying engine cooling water in the tank 10 to the engine 14 and returning the engine cooling water to the tank 10.
6, a cooling water supply system 18 that supplies cooling water to the engine cooling water supply system that supplies the cooling water in the tank 10 to the engine 14 is disposed, and a cooling water supply system 18 is provided between the tank 10 and the engine 14. Thermocouples 24 and 26 are provided in the engine coolant supply system 20 and the engine coolant discharge system 22, respectively.
The detection output of 4.26 is taken into the PID controller 28, and depending on the temperature of the engine cooling water supply system 20 and the engine cooling water discharge system 22, the heated steam from the heating steam supply system 12 or the heating steam from the cooling water supply system 18 is output. It is configured to supply cooling water to the engine cooling water circulation system 16 and maintain the engine cooling water fed to the engine 14 at a set temperature.

However, in the case of the device shown in FIG. 1, the temperature distribution of the cooling water in the engine 10 is not uniform,
4, the temperature on the cooling water outlet side of the engine 14 should be set at about ±2°C, or the temperature on the engine cooling water inlet side of the engine 14 should be set within the set value.
The temperature of the cooling water could only be controlled to about 5°C.

By the way, in recent years, as the development of small, high-performance engines has progressed, there has been a demand for highly accurate engine test pliers for measuring and evaluating various engine performances. High precision is required.

Therefore, there is a need for an engine coolant temperature control device with excellent control accuracy, which has negligible influence on engine performance, given the control accuracy of the device shown in FIG.

[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 heat distribution of engine cooling water in a tank for storing engine cooling water in the engine cooling water circulation system, and to improve the engine cooling water. An object of the present invention is to provide an engine cooling water temperature control device that can maintain the temperature of supplied 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 storing engine cooling water to the engine,
This engine cooling water is returned to the tank. Depending on the temperature of the engine cooling water in the engine cooling water circulation system, heated steam from the heating steam supply system or cooling water from the cooling water supply system is taken into the tank and supplied to the engine. In an engine cooling water temperature control device that maintains the temperature of supplied engine cooling water at a set value, a pipe for introducing heated steam or cooling water into a tank is arranged from the top to the bottom of the tank, and A plurality of columnar inlets are formed in the middle of the pipe, with the liquid injection direction facing the circumferential direction of the tank side wall, and a pipe is placed from the top of the tank to the bottom to take engine cooling water from the engine into the tank. At the same time, a plurality of engine cooling water inlets are formed in the middle of the pipe, with the engine cooling water injection direction facing in the circumferential direction of the tank side wall and in the same direction as the fluid inlet. An exhaust port is formed at the bottom of the tank to discharge the engine cooling water along the flow of engine cooling water generated by mixing the engine cooling water with the engine cooling water from the engine cooling water inlet. It is characterized by feeding 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, electromagnetic valves 34 and 36 are disposed at the ends of a cooling water supply system 30 that supplies cooling water and a heating steam supply system 32 that supplies heated steam, respectively. 30 and the heating steam supply system 32 each have a solenoid valve 34.3.
6 and connected to the tube 38. 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. This silencer 4
2 to the bottom of the pipe 38, the shower nozzle 4 constitutes a plurality of fluid inlets with the fluid injection direction directed in the circumferential direction of the side wall of the cooling water tank 40, as shown in FIG.
4 is formed. 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 evenly from each shower nozzle 44 into the cooling water tank 40. can be injected into.

In addition, in order to configure an engine cooling water circulation system, the cooling water tank 40 and the engine 46 are connected via pipes 48 and 50, and 40 yen of cooling water from the cooling water tank is transferred to the pipe 48.
is fed to the engine 46 via. The engine cooling water supplied to the engine 46 is returned to the cooling water tank 40 via the piping 50 by the 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 P via a changeover switch 56.
It is supplied to the ID 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 there is a pipe 60 in the middle of the pipe 60, as shown in FIG. A shower nozzle 62 is formed which constitutes a plurality of engine cooling water inlets, with the engine cooling water injection direction facing in the circumferential direction of the side wall of the cooling water tank 40 and facing in the same direction as the shower nozzle 44. 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, each shower nozzle 4
A vortex is generated in the cooling water tank 40 by mixing the fAc body injected from 4 and the engine cooling water injected from each shower nozzle 62, and the engine cooling water and the cooling or heating medium are mixed smoothly. It will be done. 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 is formed at the bottom of the cooling water tank 40 for discharging the engine cooling water mixed with the cooling or heating medium along the swirling direction of the engine cooling water.
Engine cooling water discharged from 4 is fed to engine 46 via piping 48.

In this way, in this embodiment, each shower nozzle 44
A vortex is generated in the cooling water tank 40 by the cooling or heating medium injected from the shower nozzle 62 and the engine cooling water injected from each shower nozzle 62, and the engine cooling water mixed with the cooling or heating medium flows through the exhaust port. The cooling water is discharged along the tangential direction of the circumference of the cooling water tank 400 via the cooling water tank 400 through the cooling water tank 400, and generation of a vortex is promoted by the suction negative pressure of the water pump of the engine 46, so that 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. I can do it.

Further, 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 overflow pipe 66 is disposed in the cooling water tank 40. 68 to maintain engine cooling water in the cooling water tank 40 at a constant level.

Further, in the embodiment described above, a silencer 42 is disposed in the middle of the pipe 38, and the silencer 42 is disposed in the middle of the pipe 38, and the silencer 42 is disposed in the middle of the pipe 38.
When the heated steam is supplied into the engine cooling water tank 8 , the silencer 42 blows the heated steam directly into the engine cooling water, so it is possible to suppress the generation of bubbles in the engine cooling water tank 40 .

Further, in the embodiment described above, the changeover switch 56 is actuated by a command from the PID controller 58 to switch the thermocouple 52
is selected, the detection output of thermocouple 52 or 54 is PI
The temperature of the engine coolant that is sent to the D controller 58 and flows through the pipe 48.50 is detected. In order to maintain the temperature of the engine cooling water circulation system at the set value, the PI
From the D controller 58 to the solenoid valve 34 of the cooling water supply system 30
Alternatively, a control output is given to the solenoid valve 36 of the heated steam supply system 32, and cooling water or heated steam is supplied to the pipe 38 by opening and closing the solenoid valve 34 or 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, in the case where the temperature on the exhaust port side of the engine 46 is controlled to t°C, since the engine 46 generates heat during operation, the cooling water on the engine cooling water outlet side is lower than the engine cooling water intake side. The temperature increases. However, 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 engine 4
6 itself also generates less heat. At this time, the thermocouple 54
When the temperature detected by the thermocouple 54 becomes lower than the set value t°C, the PID controller 58 controls the opening/closing operation of the solenoid valve 36 according to the deviation between the temperature detected by the thermocouple 54 and the set value. Heated steam from the supply system 32 is transferred to the pipe 3
8 into the cooling water tank 40.

By repeating the above control, the temperature on the exhaust port side of the engine 46 can be maintained at the set temperature.

Also, the engine 46 is set at 4000 r7) m constant, and the load is 12
An experiment was conducted using the apparatus of this embodiment in which the temperature on the exhaust port side of the engine 46 was maintained at 78° C. while operating at 0 ttanHff. It was possible to maintain the fluctuation range of the temperature on the exhaust port side of the engine 46 to 05°C. In addition, when an experiment was conducted using the apparatus shown in FIG. 1 under the same conditions as described above, the temperature fluctuation range on the intake side of the engine 14 was 10°C, and the temperature fluctuation range on the exhaust 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 and the engine cooling water discharged from the engine form a laminar flow in the cooling water tank and mix. The temperature distribution of the fluid in the water tank can be made uniform, and the temperature of the engine cooling water supplied to the engine can be controlled with high precision to maintain the set temperature. .

[Brief explanation of the drawing]

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 line III--III 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, 44.62 ...Shower nozzle, 46...Engine, 52.54...Thermocouple, 58...PID controller. Agent Tatsuyuki Unuma (TL or one person)

Claims (1)

[Claims] (1) Depending on 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, the heated steam supply system An engine cooling water temperature control device that takes heated steam 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 intake into the tank is arranged from the top to the bottom of the tank, and a plurality of fluid inlets are formed in the middle of the pipe, with the fluid injection direction facing in the circumferential direction of the side wall of the tank. A pipe for introducing cooling water into the tank is arranged from the top to the bottom of the tank, and a pipe is installed in the middle of the pipe so that the engine cooling water injection direction is oriented in the circumferential direction of the side wall of the tank and is the same as the fluid inlet. Forms a plurality of oriented engine coolant inlets and discharges engine coolant along the flow of engine coolant created by mixing fluid from the fluid inlet with engine coolant from the engine coolant inlet. An engine cooling water temperature control device characterized in that a discharge port is formed at the bottom of the tank, and the engine cooling water discharged from the discharge port is supplied to the engine.