JPH0612720U - Engine cooling system on the engine dynamo - Google Patents

Abstract

(57) [Summary] [Objective] To provide an engine cooling device capable of promptly performing cooling corresponding to the temperature of an engine. An engine cooling device in which a radiator 3 and an engine 1 cooled by cooling water are connected by two pipe lines 5 and 6 so that a refrigerant 7 flows between the radiator 3 and the engine 1. Both pipe lines 5 and 6 are provided with a control valve 14 and are connected by a flow passage 13 that bypasses the engine 1, and another control valve is provided in one of the pipe passages on the radiator side of the bypass flow passage 13. 15, the control valves 14 and 15 are controlled so as to open and close in a contradictory manner.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a device for cooling an engine on an engine dynamo (hereinafter, simply referred to as an engine cooling device).

[0002]

[Prior art]

 Conventionally, an engine such as an automobile is subjected to a performance test such as its rotation characteristic by an engine dynamo, but heat is generated due to its rotation and a temperature rise occurs. Therefore, it is necessary to appropriately cool the engine.

FIG. 2 schematically shows the configuration of a conventional engine cooling device. In this figure, 1 is mounted on an engine dynamo stand and is mechanically coupled to the engine dynamo 2, for example, an automobile. Is the engine of. A radiator 3 is housed in a water jacket 4 and is connected to the engine 1 by two pipe lines 5 and 6. The refrigerant 7 is supplied from the radiator 3 to the engine 1 through the pipe 5 (hereinafter, referred to as the first pipe), and the refrigerant 7 after cooling the engine 1 is supplied to the pipe 6 (hereinafter, referred to as the second pipe). It returns to the radiator 3 via the road.

A cooling water supply pipe 9 and a water drain pipe 10 each having a control valve 8 such as a solenoid valve are connected to the water jacket 4. Further, the second pipe 6 is provided with a temperature sensor 11 for detecting the temperature of the refrigerant 7 after cooling the engine 1. 12 is a controller.

In the above-described conventional engine cooling device, the engine 1 is cooled by the coolant 7 supplied from the radiator 3 via the first conduit 5 by, for example, a pump (not shown) provided in the engine 1. Then, the refrigerant 7 after cooling the engine 1 returns to the radiator 3 via the second conduit 6. Then, the coolant 7 returned to the radiator 3 is cooled by the cooling water in the water jacket 4.

The temperature of the refrigerant 7 after cooling the engine 1 is detected by the temperature sensor 11 provided in the second pipe line 6, and the detection output a is input to the controller 12. Is higher than a predetermined temperature, the controller 12 issues an ON signal b to the control valve 8 interposed in the cooling water supply pipe 9, whereby the control valve 8 is opened and the cooling water is cooled by the water jacket. 4 is supplied.

[0007]

[Problems to be solved by the device]

 According to the engine cooling device having the above-mentioned configuration, the system for cooling the engine 1 is closed, so that there is an advantage that a refrigerant such as a coolant can be used. However, there are the following problems. That is, in such an engine cooling device, as described above, the cooling water is supplied to the radiator 3 based on the temperature of the refrigerant 7 from the engine 1 side detected by the temperature sensor 11. Further, in this case, since the temperature sensor 11 is provided as close to the engine 1 as possible, new cold cooling water is supplied to the radiator 3 after the temperature is detected, whereby the radiator 3 side is supplied. It takes a considerable amount of time for the coldly cooled refrigerant 7 to be supplied to the engine 1.

That is, there is a considerable time lag from the detection of the temperature of the refrigerant 7 from the engine 1 side to the cooling of the engine 1 to a predetermined temperature, and it is difficult to quickly cool the engine 1 according to the temperature of the engine. The test could be adversely affected.

The present invention has been made in view of the above matters, and an object of the present invention is to provide an engine cooling device capable of quickly performing cooling corresponding to the temperature of the engine.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a radiator and an engine cooled by cooling water are connected by two pipelines so that a refrigerant flows between the radiator and the engine. In the engine cooling device, both pipes are provided with a control valve and are connected by a flow passage that bypasses the engine, and one of the pipes is provided with another control valve on the radiator side of the bypass flow passage. The control valves are provided so as to control the opening and closing of both of the control valves in a contradictory manner.

[0011]

[Action]

 When both of the control valves are switched to supply cooler refrigerant to the engine, the refrigerant is quickly supplied to the engine side, so the time from temperature detection on the engine side to engine temperature cooling is shortened. it can.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of an engine cooling device according to the present invention. What is shown in this figure is largely different from that shown in FIG. 2 is that the first conduit 5 and the second conduit 6 are , The engine 1 is connected by a flow path 13 that bypasses, and the bypass flow path 13 is provided with a control valve 14 such as an electromagnetic valve. That is, another control valve 15 is provided.

The control valves 14 and 15 are antithetically controlled by control signals c and d from the controller 12. That is, when the control valve 14 is open, the control valve 15 is closed, and conversely, when the control valve 14 is closed, the control valve 15 is opened. Further, the water jacket 4 is provided with a temperature sensor 16 for detecting its temperature, and a detection signal b thereof is inputted to a controller 17 for controlling the control valve 8.

Next, the operation of the engine cooling device having the above configuration will be described. The control valve 15 provided in the pipe line 5 is opened and the control valve 14 provided in the bypass flow passage 13 is closed. As a result, the cold refrigerant 7 is supplied from the radiator 3 to the engine 1, and the engine 1 is cooled. Then, during normal cooling, only the control valve 14 is opened and the control valve 15 is closed, so that the refrigerant 7 becomes the bypass flow passage 13-a part of the first pipe 5a 5a-engine 1-second pipe. It circulates in part 6a of the road. At this time, the refrigerant 7 from the radiator 3 stands by with the control valve 15 preventing the inflow to the engine 1 side, but since it is cooled by the cooling water of the water jacket 4, the bypass passage The temperature is lower than that of the refrigerant 7 that circulates 13 or the like.

When the temperature sensor 11 detects that the temperature of the refrigerant 7 from the engine 1 is higher than the set value, the controller 12 outputs the control signals c and d, and the control valve 14 is closed. Then, the control valve 15 is opened. In this case, the refrigerant 7 which has been prevented from flowing into the engine 1 side by the control valve 15 flows into the engine 1 side by opening the control valve 15 and cools it.

That is, according to this embodiment, when the temperature rise on the engine 1 side is detected, the coolant 7 having a lower temperature than the coolant 7 that constantly cools the engine 1 is quickly supplied to the engine 1 side. Therefore, the engine 1 can be cooled faster than before, and the time lag can be suppressed as much as possible.

In the above embodiment, when the engine 1 is warmed up, it is only necessary to warm the refrigerant 7 in the engine 1 and the bypass passage 13. Therefore, the warm-up time can be set in the conventional engine cooling device. It has the advantage that it is shorter than the conventional one.

The temperature of the cooling water in the water jacket 4 for cooling the radiator 3 is controlled by the controller 17 outputting a control signal e to the control valve 8 on the basis of the output from the temperature sensor 16 to control the opening / closing thereof. It is maintained at a constant and low temperature by supplying cooling water.

The present invention is not limited to the above embodiment, and the control valve 15 may be provided in the second conduit 6a, for example. The bypass passage 13 and the control valve 15 are preferably provided as close to the engine 1 side as possible. Further, the control valves 8, 14 and 15 may be pneumatically controlled valves.

[0020]

[Effect of device]

 As described above, according to the present invention, when the temperature of the engine rises, it can be detected quickly and the engine can be cooled faster than before, and the time lag can be suppressed as much as possible. It is possible to efficiently perform cooling corresponding to the temperature.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a configuration example of an engine cooling device according to the present invention.

FIG. 2 is a diagram schematically showing a configuration example of a conventional engine cooling device.

[Explanation of symbols]

1 ... Engine, 3 ... Radiator, 5, 6 ... Pipe line, 7 ... Refrigerant, 13 ... Bypass flow passage, 14, 15 ... Control valve.

Claims (1)

[Scope of utility model registration request] 1. An engine cooling device on an engine dynamo, wherein a radiator cooled by cooling water and an engine are connected by two pipelines so that a refrigerant flows between the radiator and the engine. Down the road
It is equipped with a control valve and is connected by a flow path that bypasses the engine, and another control valve is provided on either side of the bypass path on the radiator side of the bypass flow path, and both control valves are opened and closed in a contradictory manner. An engine cooling device on an engine dynamo characterized by being controlled.