JPH09125958A - Engine warming-up promotion cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively promote an engine warming-up process and restrain the emission of white smoke and exhaust gas odor at low temperature by circulating cooling water through a cooling water circuit shortcut among a water pump, a three-way valve, a bypass passage and the water pump in the cold state of an engine. SOLUTION: A control device 20 to receive an output signal from a temperature detection means 16 for detecting temperature inside an engine 1 causes cooling water to circulate through a water pump 5, a three-way valve 12, a communication passage 14 and a bypass passage 8, and then flow to the suction side 5a of the water pump 5 in the cold state of the engine 1, because the three- way valve 12 closes a passage 10 to the engine 1. In the warm state of the engine 1, the three-way valve 12 opens the communication passage 14 to the engine 1. Consequently, the cooling water circulates through the water pump 5, the three-way valve 12, the engine 1, a thermostat 3 and the bypass passage 8 and then flow to the suction side 5a of the water pump 5. Thus, the cooling water does not flow into the engine 1 in a clod state, thereby promoting an engine warming-up process and reducing the emission of white smoke at low temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine warming-up accelerated cooling device in which cooling water can be circulated between an engine and a radiator.

[0002]

2. Description of the Related Art As is well known, an engine cooling device for a gasoline engine, a diesel engine, etc., is required until the warm-up at the time of starting the engine in a cold state is almost completed.
By bypassing the radiator, the cooling water flows through the bypass passage so as not to be cooled by the radiator, thereby promoting warm-up of the engine.

However, particularly in a diesel engine, when the outside air temperature is low in a cold region or the like, the above-mentioned warm-up promotion is insufficient and white smoke is emitted until the temperature around the piston rises. The lower the outside air temperature, the longer the time. From the above,
Various proposals have been made from the past, for example, the actual Kaihei 2-
There is a 3019 publication.

In the technique described in the publication, as shown in FIG. 4, the engine 01 and the radiator 02 are connected to the inlet pipe 0.
3 and the outlet pipe 04, the inlet pipe 03 is provided with a thermostat 05, the outlet pipe 04 is provided with a water pump 06, and the thermostat 05 and the water pump 06 are provided.
Is a cooling device for an internal combustion engine connected by a bypass pipe 07, and is a radiator 02 of the outlet pipe 04.
An on-off valve 08 is disposed between the water pump 06 and the water pump 06.

Therefore, in this conventional device, an opening / closing valve 08 is also provided on the outlet pipe 04 side so that the opening / closing valve 8 is warmed up.
Is closed to prevent the cooling water from the radiator 02 from flowing into the engine 01. The cooling water discharged to the inlet pipe 03 that has cooled the engine 01 is the thermostat 0
5, but the temperature did not reach the specified temperature, so radiator 02
Since the opening to the engine is closed, the thermostat 05 is bypassed and circulated to the bypass pipe 07, the water pump 06, the engine 01, and the inlet pipe 03 to cool the engine 01, and the cooling water is circulated. The heat of the cooling water is taken away by each part other than the engine.

As another conventional example, an actual flat plate 2-1
There is 10241 publication. The technique described in the publication is, as shown in FIG. 5, between the engine 01 and the radiator 02,
In an internal combustion engine that forms a cooling water circulation circuit via a water pump 06, an electromagnetic valve 09 that is controlled to open and close by a control device is provided between the discharge side of the water pump 06 and the inlet pipe 03 of the radiator 02 inlet side. The installed bypass passage 07 is communicated with and the solenoid valve 09 is connected.
The control device 010 for controlling the opening and closing of the engine receives a signal from the throttle opening sensor 011 and determines the load state of the engine, and the load determining means 015.
Of the electromagnetic valve 09 by the engine temperature determining means 016 for determining the cooling water temperature in the engine by receiving the output signal from the water temperature sensor 013 and the output signal from the load determining means 015 and the engine temperature determining means 016. The engine cooling device includes an electromagnetic valve driving unit 017 that outputs an opening / closing signal.

Therefore, the technique disclosed in Japanese Utility Model Laid-Open No. 2-110241 keeps the temperature of the combustion chamber wall high by reducing the flow rate of the cooling water in the engine during warm-up operation and partial load when the cooling water temperature is low. It is intended to stabilize the combustion and improve the warm-up characteristics after starting. Further, as another conventional example, there is JP-B-4-22030.

In the technique described in the publication, as shown in FIG. 6, the cooling water is circulated between the engine 01 and the radiator 02 so as to be circulated to the inlet pipe 03 and the outlet pipe 04, and the inlet pipe 03 and the outlet pipe 0 are connected.
4 is connected by a bypass water passage 07, a thermostat 05 is provided at a branch portion of the inlet pipe 03, and a water pump 06 is provided at a confluence portion of the outlet pipe 04. 07 is provided with a solenoid valve 09 and a valve driving means 017 for opening and closing the solenoid valve 09, a temperature sensor 013 is provided on the upstream side of the branch portion of the inlet pipe 03, and the electromagnetic portion is driven corresponding to the temperature detected by the temperature sensor 013. The temperature control device for engine cooling water is provided with a control device 010 for controlling the opening of the solenoid valve 09 by controlling the means 017.

In this conventional example, as shown in FIG. 6, the control device 010 sets the opening degree θ of the solenoid valve 09 to zero when the temperature of the cooling water detected by the water temperature sensor 013 is, for example, 20 ° C. or lower, and gradually thereafter. That is, when the temperature is slightly lower than the opening temperature of the thermostat 05 (for example, 80 ° C.), for example, 70 ° C., the driving means 017 is operated so that the opening degree θ of the solenoid valve 09 is fully opened.

Therefore, during the warm-up operation, the cooling water does not circulate in the engine 01, so that the temperature rise of the cooling water of the engine 01 can be promoted and the warm-up time can be shortened. Further, when the water temperature becomes 20 ° C. or higher, the cooling water circulates little by little, and the bypass water passage 07, the water pump 06 and the cooling water in the inlet pipe 03 are heated,
Finally, the thermostat 05 is opened and cooled by the radiator 02.

Therefore, in the conventional example, as described above, when the cooling water temperature becomes 20 ° C. or higher, the solenoid valve 09 starts to open little by little during the warm-up operation, and the cooling water is gradually introduced into the bypass passage 07, the water pump 06, and the like. The cooling water in the inlet pipe 03 is heated and circulated to the engine 01. For example, when the temperature of the cooling water is about 70 ° C., the opening degree of the solenoid valve 09 is fully opened. It is a temperature control device.

[0012]

However, in the technique disclosed in Japanese Utility Model Laid-Open No. 2-3019 described as the above-mentioned conventional example, since the on-off valve 08 is closed during warm-up in the cold state, the cooling water is Since the water pump 06, the engine 01, the thermostat 05, the bypass pipe 07, the water pump 06, and the engine 01 are circulated in this order, the cooling water is circulated in each portion other than the engine 01 in which the cooling water circulates during the warm-up. Since the heat of the cooling water is taken away and the temperature of the cooling water is lowered, the warm-up of the cold start may be delayed and white smoke may be discharged, and odorous exhaust gas may be discharged.

Further, the actual opening 2 described as the above-mentioned conventional example.
As described above, in the technique described in Japanese Patent No. -11024, the solenoid valve 09 is gradually opened to decrease the flow rate of the cooling water in the engine 01 to maintain the wall temperature in the combustion chamber at a high temperature during the warm-up operation. Since the cooling water always circulates in the order of the water pump 06, the engine 01, the inlet pipe 03, the bypass pipe 07, the solenoid valve 09, the water pump 06, and the engine 01, the above-mentioned actual open flat 2- As in the technique described in Japanese Patent No. 3019, heat of the cooling water is taken away by a portion other than the engine 01 in which the cooling water circulates, so that the warm-up is delayed and the white smoke and the odor of exhaust gas are discharged. become.

Further, in the technique described in Japanese Utility Model Publication No. 4-22030, as described above, the solenoid valve 09 starts to open the bypass water passage 07 when the cooling water temperature reaches 20 ° C.
When the cooling water temperature is 20 ° C. or higher, the cooling water is constantly supplied to the engine 01, the thermostat 05, the bypass water passage 07, the solenoid valve 09, the water pump 06, and the engine 01 little by little. The technical idea is to shorten the warm-up time by circulating the fluid, and in the case of the conventional device as well, in the circulation path in the cold state, the temperature of the cooling water is the same as in the two conventional examples. The parts other than the engine 01 are exposed to heat and the warm-up is delayed, and the white smoke and the odor of the exhaust gas are discharged as described above.

Further, since the pump is driven even when the temperature of the pump is 20 ° C. or lower, it is necessary to provide a separate controller to control the operation of the pump in conjunction with the solenoid valve 09.
There is a cost, which leads to maintenance man-hours. Further, in the technique described in Japanese Utility Model Publication No. 4-22030, the cooling water temperature during warm-up operation is 20
Up to ℃, the opening of the solenoid valve 09 becomes zero, and the cooling water between the engine block 01a and the cylinder head 01b may not circulate. At this time, however, the discharge flow where the water pump 06 is operating is completely blocked. As a result, the load on the water pump 06 increases, which may damage the water pump 06.

In order to prevent the water pump 06 from being damaged, a mechanism for transmitting the rotation of the crankshaft, for example, the crankshaft, to the water pump 06 is provided with a clutch means that is attached / detached according to the operation of the solenoid valve 09. Since it is necessary to provide a control device for controlling it, the cost is increased, and maintenance is required for the above-mentioned clutch means and control device, which makes the mechanism complicated and requires many man-hours for its maintenance. .

The present invention was devised in view of the above problems, and in a cooling device for promoting warm-up of an engine in which cooling water can be circulated between the engine and a radiator, when the engine is in a cold state. Provided is an engine warming-up accelerated cooling device having a communication passage for bypassing a discharge flow of a water pump to a suction side of the water pump and a switching valve formed so as not to circulate the cooling water in the engine. The purpose is to

[0018]

Therefore, in the engine warming-up accelerated cooling device of the present invention according to claim 1, an inlet pipe connected from the engine to the radiator and an outlet pipe connected from the radiator to the engine. A bypass passage that connects the thermostat arranged in the inlet pipe and the water pump arranged in the outlet pipe, a communication passage that connects the discharge side of the water pump and the bypass passage, and a cooling state of the engine. Sometimes the passage to the engine is closed so that the discharge flow of the water pump communicates with the bypass passage, and when the engine is warm, the communication passage is closed and the switching valve for communicating the discharge flow with the engine and the temperature of the engine are controlled. And a control device for detecting the detection signal and controlling the opening / closing of the switching valve according to the detection signal. It is intended.

According to a second aspect of the present invention, in the engine warming-up accelerated cooling system of the first aspect, one end of the bypass passage is connected to an upstream side of the thermostat, and the other end of the bypass passage is sucked by the water pump. Side of the water pump, one end of the communication passage is connected to the discharge side of the water pump, and the other end is connected to the bypass passage. It is characterized in that it is configured to switch the bypass passage of the discharge flow or the passage to the engine.

According to a third aspect of the present invention, in the engine warming accelerated cooling device of the present invention, the switching valve is formed by a three-way valve such as a solenoid valve, a thermostat and a pressure sensitive valve. It is characterized by that. In the engine warming-up accelerated cooling device of the present invention according to claim 4, in the configuration according to any one of claims 1 to 3, the detection of the engine temperature by the control device that controls the opening and closing of the switching valve is performed by cooling the engine. It is characterized in that it is configured to detect water, lubricating oil, and the internal temperature of the engine such as a cylinder head and a cylinder block.

According to a fifth aspect of the present invention, in the engine warming-up accelerated cooling system according to the fourth aspect, the thermostat opens when the temperature in the vicinity of the cylinder reaches about 100 ° C. and the cooling water is fed to the radiator. It is characterized by being configured to flow.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view of an engine showing an embodiment of the present invention, FIG. 2 is an enlarged perspective view showing a P portion of FIG. 1, and FIG. 3 is an explanatory view showing an engine cooling water circuit of FIG.

As shown in FIG. 1, the engine 1 and the radiator 2 are connected to the upper tank 4 of the radiator 2 with cooling water for cooling the engine from a cylinder head 1a of the engine via a thermostat 3, and one end of the radiator 2 is connected.
An outlet pipe 7 is provided which is connected to the lower tank 4a and the other end is connected to the suction side 5a of the water pump 5.

As shown in FIG. 2, a bypass passage 8 having one end connected to the upstream side of the thermostat 3 provided in the inlet pipe 6 and the other end connected to the discharge side of the water pump 5 is provided. Has been. The discharge side 5b of the water pump 5 is connected to the engine 1 by a passage 10 as shown in FIGS.
A one-way valve 12 is provided, and a communication passage 14 connected from the three-way valve 12 to the bypass passage 8 is provided.

As shown in FIG. 3, the three-way valve 12 detects the temperature inside the engine such as the cooling water of the engine 1, the engine oil, the cylinder, the cylinder block and the cylinder head by the temperature detecting means 16, and the three-way valve 12 is shown. Control device 2 for opening and closing the three-way valve 12 by inputting to the opening and closing means 17 of the
0 is provided. The control device 20 closes the three-way valve 12 so as to introduce the cooling water into the bypass passage 8 when the engine is cold, and opens the three-way valve 12 so that the cooling water is introduced into the engine 1 when the engine is warm. It is configured.

That is, when the engine is in a cold state, the three-way valve 12 closes the passage 10 to the engine 1, and the cooling water flows to the water pump 5, the three-way valve 12, the communication passage 14, the bypass passage 8, and the suction side 5a of the water pump 5. When circulating and in a warm state, the three-way valve 12 opens a communication passage to the engine 1, and the cooling water is supplied to the water pump 5, the three-way valve 12, the engine 1, the thermostat 3, the bypass passage 8, and the suction side 5a of the water pump 5.
It is formed to circulate in.

When the engine is operated and the temperature of the cooling water reaches a predetermined value or higher, for example, 85 ° C. or higher, the thermostat 3 arranged in the cooling water circuit of the engine connects the radiator 2 with the passage to the inlet pipe 6 to the radiator 2. To open a circulation circuit of the engine 1, the inlet pipe 6, the thermostat 3, the radiator 2, the water pump 5, and the engine 1.

Since the embodiment of the present invention is constructed as described above, the three-way valve 12 is closed and the water pump 5 and the three-way valve 1 are closed when the engine is in the cold state as described above.
2, the cooling water flow is short-circuited so as to flow between the communication passage 14, the bypass passage 8 and the water pump 5 and does not flow into the engine 1, so that the cooling water inside the engine is almost in a stagnant state and the engine warms up. It reduces the white smoke emission at low temperature, reduces the work of the water pump, and saves fuel during the warm-up period. The three-way valve 12 described above has a temperature inside the engine lower than the opening / closing operating temperature of the thermostat 3 arranged in the conventional cooling water circuit, although it varies depending on the part detecting the engine temperature and the specifications of the engine. For example, the control device 20 is formed so as to open and close at about 70 ° C to 80 ° C.

The opening / closing means 17 of the three-way valve 12 is operated by a signal from the control device 20 and is a conventionally known electromagnetic type, a temperature-sensitive type that operates by detecting the temperature inside the engine, and the cooling water. It is formed by a pressure-sensitive type or the like that detects and operates the above pressure. The temperature inside the engine that is detected inside the engine is not uniquely determined because it is determined by the specifications of the engine and the part that detects the temperature.

Further, in the present embodiment, in the cold state as described above, the cooling water is heated in the internal state of the engine 1 in a stagnant state and warming up is promoted, for example, even if the cylinder temperature of the engine becomes high. , Inlet pipe 6 to radiator 2
The thermostat 3 does not open because no cooling water is flowing to it. Therefore, if a temperature sensor is provided for each cylinder to operate the opening / closing means 17, if the temperature of the cooling water around the cylinder reaches, for example, about 100 ° C. as shown in FIG. It is also possible to input the signal to the detection means 17 and operate the opening / closing means 17 by the output signal of the control device 20.

In the above-described embodiment of the present invention, the cooling water circuit is short-circuited to circulate the cooling water between the war pump 5, the three-way valve 12 and the bypass passage 8 when the engine is in a cold state. Since the circulation of the cooling water inside the engine 1 is stopped to accelerate the rapid warm-up until the temperature of the engine reaches about 100 ° C., for example, it is possible to effectively discharge white smoke and odor in exhaust gas at low temperature. Can be suppressed.

[0032]

As described in detail above, according to the engine warming-up accelerated cooling device of the present invention as defined in claim 1, the inlet pipe connected from the engine to the radiator and the inlet pipe connected to the engine from the radiator are connected. An outlet pipe, a bypass passage communicating with a thermostat arranged in the inlet pipe and a water pump arranged in the outlet pipe, a communication passage communicating between the discharge side of the water pump and the bypass passage, and the engine When the engine is in a cold state, the passage to the engine is closed to allow the discharge flow of the water pump to communicate with the bypass passage, and when the engine is warm, the communication passage is closed to connect the discharge flow to the engine, and a switching valve of the engine. Since it is equipped with a control device that detects the temperature and controls the opening and closing of the switching valve according to the detection signal, During Jin cold, the cooling water flow in order to circulate the cooling water circuits shortcut between the water pump, the three-way valve, bypass, water pump, not circulation of the cooling water is performed inside the engine. The engine warm-up is effectively promoted to suppress the emission of white smoke and the odor of exhaust gas at low temperatures, and the circulation of the cooling water is short-circuited as described above to reduce the work of the war pump, thereby saving fuel.

Further, during warm-up, the cooling water flow circulates in the cooling water circuit of the water pump, the three-way valve, the engine and the water pump, so that the cooling around the cylinder of the engine is performed and the temperature inside the engine further rises. If so, the above-mentioned thermostat operates to introduce the cooling water into the radiator,
The cooling water circuit of the water pump, the three-way valve, the engine, the radiator, and the water pump is configured so that the engine is cooled and the engine can be operated smoothly.

According to a second aspect of the present invention, in the engine warming-up accelerated cooling system according to the first aspect, one end of the bypass passage is connected to an upstream side of the thermostat, and the other end is sucked by the water pump. Side of the water pump, one end of the communication passage is connected to the discharge side of the water pump, and the other end is connected to the bypass passage. Since it is configured to switch the discharge flow to the bypass passage or the passage to the engine, the bypass passage connected to the upstream side of the thermostat is connected to the discharge side of the water pump, and through the three-way valve. The warming-up can be promoted by a device having a simple structure that only switches the bypass passage or the passage to the engine.

According to a third aspect of the present invention, in the engine warming-up accelerated cooling system according to the first or second aspect, the switching valve is formed by a three-way valve such as a solenoid valve, a thermostat and a pressure sensitive valve. Therefore, since the engine internal temperature is detected, it is possible to rapidly warm up the inside of the engine in a state where the cooling water is substantially retained in the engine until near the completion of the warming-up operation. Emission of smoke and emission of odor of exhaust gas can be suppressed.

According to a fourth aspect of the present invention, in the engine warming-up accelerated cooling system of the present invention, in the configuration according to any one of the first to third aspects, the control device for controlling the opening / closing of the switching valve detects the engine temperature. Since it is configured to detect the engine cooling water, lubricating oil, and the internal temperature of the engine such as the cylinder head and cylinder block, it is not affected by the temperature of the inlet pipe, outlet pipe, etc. that is easily cooled to the outside air, and is accurately controlled. In addition, by the temperature of the cooling water substantially retained in the engine at the substantial temperature inside the engine, it is possible to rapidly warm up the inside of the engine,
Emission of white smoke and exhaust gas odor at low temperatures can be suppressed.

According to a fifth aspect of the present invention, in the engine warming-up accelerated cooling system according to the fourth aspect, the thermostat opens when the temperature in the vicinity of the cylinder reaches about 100 ° C. and the cooling water is fed to the radiator. Since it is configured to flow, the temperature of the cooling water that has substantially stayed in the engine at the substantial temperature inside the engine can promptly warm up the inside of the engine, and white smoke at low temperatures can be promoted. The temperature inside the engine can be directly detected as well as the exhaust gas and the exhaust gas odor can be suppressed.
It is possible to prevent seizure of the engine.

[Brief description of the drawings]

FIG. 1 is a perspective view of an engine showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a P part in FIG.

FIG. 3 is an explanatory diagram showing an engine cooling water circuit of FIG. 1.

FIG. 4 is an explanatory diagram showing a conventional engine cooling device.

FIG. 5 is an explanatory diagram showing another conventional engine cooling device.

FIG. 6 is an explanatory diagram showing another conventional engine cooling device.

[Description of sign]

 1 Engine 2 Radiator 3 Thermostat 4 Upper Tank 4a Lower Tank 5 Water Pump 5a Suction Side 5b Discharge Side 6 Inlet Pipe 7 Outlet Pipe 8 Bypass Passage 10 Passage 12 3-Way Valve 14 Communication Passage 16 Temperature Detection Means 17 Control Unit 20 Control Device

Claims (5)

[Claims] 1. An inlet pipe connected from an engine to a radiator, an outlet pipe connected from the radiator to the engine, a thermostat arranged in the inlet pipe, and a water pump arranged in the outlet pipe. A bypass passage for connecting the discharge side of the water pump and the bypass passage, and when the engine is in a cold state, the passage to the engine is closed to allow the discharge flow of the water pump to communicate with the bypass passage.
A switching valve that closes the communication passage to communicate the discharge flow with the engine when the engine is warmed up, and a control device that detects the temperature of the engine and controls the opening and closing of the switching valve according to the detection signal are provided. An engine warm-up accelerating cooling device characterized in that 2. The bypass passage has one end connected to the upstream side of the thermostat and the other end connected to the suction side of the water pump, and one end of the communication passage has one end of the water pump. It is formed so as to be connected to the discharge side and the other end is connected to the bypass passage, and is configured to switch the discharge flow of the water pump to the bypass passage or the engine by the switching valve. The engine warming-up accelerated cooling device according to claim 1, wherein: 3. The switching valve is a solenoid valve, a thermostat,
It is characterized by being formed of a three-way valve such as a pressure sensitive valve,
The engine warming-up accelerated cooling device according to claim 1. 4. The detection of the engine temperature of the control device for controlling the opening / closing of the switching valve is configured to detect the engine cooling water, the lubricating oil, and the internal temperature of the engine such as the cylinder head and the cylinder block. Characteristic,
The engine warming-up accelerated cooling device according to claim 1. 5. The engine warming-up accelerated cooling according to claim 4, wherein the thermostat is opened to flow the cooling water to the radiator when the temperature near the cylinder reaches about 100 ° C. apparatus.