JP3019759B2 - Engine warm-up promoting cooling system - Google Patents

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 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, a cooling system for an engine of a gasoline engine, a diesel engine, or the like is used until the warm-up at the start of the engine in a cold state is substantially 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.

[0003] However, especially in a diesel engine, when the outside air temperature is low in a cold region or the like, the promotion of the warm-up is insufficient, and white smoke is discharged until the temperature around the piston rises. The lower the outside air temperature, the longer the time. From the above,
Conventionally, various proposals have been made.
No. 3019.

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

Therefore, in this conventional apparatus, the on-off valve 08 is also provided on the outlet pipe 04 side, and the on-off valve 8 is provided during warm-up.
To prevent the cooling water from the radiator 02 from flowing to the engine 01. The cooling water flowing into the inlet pipe 03 that has cooled the engine 01 is supplied to the thermostat 0
5, but the temperature has not reached the predetermined temperature and the radiator 02
Is closed, the thermostat 05 bypasses the thermostat 05 and circulates 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 circulates. The heat of the cooling water is deprived of each part other than the engine.

As another conventional example, Japanese Utility Model Application Laid-Open No. 2-1
No. 10241. The technology described in the publication discloses that the engine 01 and the radiator 02 are disposed between the engine 01 and the radiator 02 as shown in FIG.
In an internal combustion engine forming a cooling water circulation circuit via a water pump 06, an electromagnetic valve 09 controlled to be opened and closed by a control device is provided between the discharge side of the water pump 06 and the inlet pipe 03 on the inlet side of the radiator 02. The installed bypass passage 07 is communicated with the solenoid valve 09.
A control device 010 for controlling the opening and closing of the engine includes a load determining means 015 for receiving a signal from the throttle opening sensor 011 and determining a load state of the engine;
The engine valve judging means 016 for judging the temperature of the cooling water in the engine in response to the output signal of the water temperature sensor 013 and the output signal of the load judging means 015 and the engine temperature judging means 016. And a solenoid valve driving means 017 for outputting an open / close signal to the engine.

Accordingly, the technique described in Japanese Utility Model Laid-Open No. 2-110241 reduces the flow rate of the cooling water in the engine to maintain the combustion chamber wall temperature at a high temperature during a warm-up operation and at a partial load when the cooling water temperature is low. This is intended to stabilize combustion and improve warm-up characteristics after starting. As still another conventional example, there is Japanese Utility Model Publication No. 4-203030.

According to the technique described in the publication, as shown in FIG. 6, cooling water is connected to an inlet pipe 03 and an outlet pipe 04 so that cooling water can circulate between an engine 01 and a radiator 02.
4 is connected by a bypass water passage 07, a thermostat 05 is provided at a branch of the inlet pipe 03, and a water pump 06 is provided at a junction of the outlet pipe 04. A solenoid valve 09 and a valve driving means 017 for opening and closing the solenoid valve 09 are provided. A temperature sensor 13 is provided on the upstream side of the branch portion of the inlet pipe 03, and the electromagnetic unit is driven in accordance with the temperature detected by the temperature sensor 013. This is a temperature control device for engine cooling water provided with a control device 010 for controlling the opening degree of the solenoid valve 09 by controlling the means 017.

In the conventional example, as shown in FIG. 6, the control device 010 sets the opening 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 less, and gradually thereafter. That is, at a temperature slightly lower than the temperature at which the thermostat 05 opens (for example, 80 ° C.), for example, at 70 ° C., the driving means 017 is operated so that the opening 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. Also, when the water temperature becomes 20 ° C. or higher, the cooling water circulates little by little, and the cooling water in the bypass water passage 07, the water pump 06 and the inlet pipe 03 is heated,
Finally, the thermostat 05 is opened and cooled by the radiator 02.

Therefore, in this conventional example, as described above, during the warm-up operation, when the cooling water temperature reaches 20 ° C. or higher, the solenoid valve 09 starts opening little by little, and gradually supplies the cooling water little by little to the bypass passage 07, the water pump 06, and the water pump 06. 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 described in Japanese Utility Model Laid-Open Publication No. 2-30119 described as the conventional example, since the on-off valve 08 is closed during warm-up in a cold state, cooling water is not supplied. Since the water is circulated in the order of the water pump 06, the engine 01, the thermostat 05, the bypass pipe 07, the water pump 06, and the engine 01, the cooling water is circulated at each part other than the engine 01 where the cooling water circulates during the warm-up. Since the heat of the cooling water drops, the warm-up of the cold start is delayed and white smoke is discharged, and odorous exhaust gas may be discharged.

[0013] In addition, the actual opening 2 described as the above-mentioned conventional example.
As described above, in the technology described in Japanese Patent Application Publication No. 11024, during the warm-up operation, the solenoid valve 09 is gradually opened to decrease the flow rate of the cooling water in the engine 01 and to maintain the wall temperature in the combustion chamber at a high temperature. The cooling water is constantly circulating 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. As in the technology described in Japanese Patent No. 3019, since the heat of the cooling water is taken away in a portion other than the engine 01 in which the cooling water circulates, the warm-up is delayed, and the odor of the white smoke and the exhaust gas is discharged. become.

Further, according to the technique described in Japanese Utility Model Publication No. Hei 4-22030, as described above, the solenoid valve 09 starts opening 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, and in the case of the present conventional apparatus, the temperature of the cooling water in the circulating path at the time of cold is the same as in the above two conventional examples. Heat is transferred to parts other than the engine 01 and the warm-up is delayed, and the white smoke and the odor of the exhaust gas are discharged as described above.

Further, even when the temperature of the pump is lower than 20 ° C., the pump is driven. Therefore, it is necessary to provide a separate control device to control the operation of the pump in conjunction with the solenoid valve 09.
It is costly, which leads to increased maintenance man-hours. Also, the technology described in Japanese Utility Model Publication No. Hei 4-22030 discloses that the cooling water temperature during warm-up operation is 20 ° C.
Up to ° C., 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, the destination of the discharge flow where the water pump 06 is operating is closed. As a result, the load on the water pump 06 increases, and the water pump 06 may be damaged.

In order to prevent damage to the water pump 06, a mechanism for transmitting the rotation of, for example, a crankshaft of the water pump 06 to the water pump 06 is provided with a clutch means to be attached and detached in accordance with the operation of the solenoid valve 09. However, since it is necessary to provide a control device for controlling the same, the cost is increased, and maintenance is required for the above-mentioned clutch means and the control device, and the mechanism becomes complicated, and the maintenance requires a lot of man-hours. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is directed to a cooling device for promoting warming-up of an engine in which cooling water can be circulated between the engine and a radiator. An engine warm-up provided with a communication passage for bypassing the discharge flow of the water pump to the suction side of the water pump to cause a short circuit, and a switching valve formed so as not to circulate the cooling water in the engine. It is an object of the present invention to provide a machine-assisted cooling device.

[0018]

According to a first aspect of the present invention, there is provided an engine warming-up cooling device according to the present invention, wherein an inlet pipe is connected from an engine to a radiator, and an outlet pipe is connected from the radiator to the engine. And a thermostat arranged in the above inlet pipe
Of and a bypass passage communicating the upstream side and the suction side of the water pump disposed in the outlet pipe, and the communicating passage connecting the discharge side and the bypass passage of the water pump, during cold-of the engine to the engine And the discharge flow of the water pump is communicated with the bypass passage.
To short-circuit the suction side and the discharge side of the water pump ,
Comprising a switching valve for communicating the discharge flow close the communication passage in the engine when the engine is warming state, by detecting the temperature of the engine, and a control device for controlling the opening and closing of the switching valve by the detection signal It is characterized by that .

According to a second aspect of the present invention, in the configuration of the first aspect, one end of the bypass passage is connected to an upstream side of the thermostat, and the other end is a suction port of the water pump. The communication path is formed such that 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. The discharge flow is configured to switch the bypass passage or the passage to the engine.

According to a third aspect of the present invention, there is provided an engine warming-up cooling device according to the fourth or second aspect, wherein 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: Also, the above claim
In the invention described in any one of the above items 1 to 3 , the detection of the engine temperature by the control device that controls the opening and closing of the switching valve includes:
It can also be configured to detect the engine cooling water, lubricating oil and the internal temperature of the engine such as the cylinder head and cylinder block (aspect 1) .

In the configuration according to the first aspect, the thermostat may be opened when the temperature near the cylinder reaches about 100 ° C., and the cooling water may be supplied to the radiator (aspect 2) .

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

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

As shown in FIG. 1, the engine 1 and the radiator 2 are connected to an upper tank 4 of the radiator 2 through a thermostat 3 with cooling water for cooling the engine from a cylinder head 1a of the engine.
The outlet pipe 7 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 suction side 5a of the water pump 5. Is provided. The discharge side 5b of the water pump 5 is connected to the engine 1 through a passage 10 as shown in FIGS.
Between the discharge side 5b and the engine 1 of the water pump 5 has three-way valve 12 is provided, the communication passage 14 is provided from the three-way valve 12 is connected to the bypass passage 8 above.

As shown in FIG. 3, the three-way valve 12 detects the temperature inside the engine 1 such as the cooling water, engine oil, cylinder, cylinder block, cylinder head, etc. of the engine 1 by means of temperature detecting means 16. Control device 2 which inputs to the opening / closing means 17 and operates the three-way valve 12 to open / close
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 as to introduce the cooling water into the engine 1 when the engine is warm. It is configured.

That is, when the engine is cold, 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 5 a of the water pump 5. In a circulating and 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 so as to circulate.

When the temperature of the cooling water becomes equal to or higher than a predetermined value, for example, 85 ° C. or more, the thermostat 3 provided in the cooling water circuit of the engine is connected to the radiator 2 through the inlet pipe 6. And 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 is formed.

[0028] Embodiments of the present invention, which is configured as described above, the cold state of the engine as described above, the three-way valve 12 is closed, the water pump 5, the three-way valve 1
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. Therefore, the cooling water inside the engine is almost stagnated, and the engine warms up. And reduce white smoke emission at low temperatures, reduce the work of the water pump, and save fuel during the warm-up period. The above-mentioned three-way valve 12 has a temperature lower than the opening / closing operation temperature of the thermostat 3 disposed in the conventional cooling water circuit, although the temperature inside the engine is different depending on the part for detecting the engine temperature and the specifications of the engine. For example, the control device 20 is formed 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 which operates by detecting the temperature inside the engine, and the cooling water. It is formed of a pressure-sensitive type or the like that operates by detecting the above pressure. Since the temperature inside the engine detected inside the engine is determined by the specifications of the engine and the part where the temperature is detected, it cannot be uniquely determined.

In the present embodiment, in the cold state as described above, the cooling water is heated in the stagnation state inside the engine 1 to promote warm-up. For example, even if the cylinder temperature of the engine becomes high, , Radiator 2 from inlet pipe 6
The thermostat 3 is not opened because no cooling water flows to the thermostat 3. Therefore, a temperature sensor is provided for each cylinder to operate the opening / closing means 17, and as shown in FIG. 3, if the temperature of the cooling water around the cylinder becomes, for example, about 100 ° C., The opening and closing means 17 may be operated by an output signal of the control device 20 by inputting the signal to the detecting means 17.

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 cold. The circulation of the cooling water inside the engine 1 is stopped until the temperature of the engine 1 reaches, for example, about 100 ° C. to promote rapid warm-up, so that the emission of white smoke at low temperatures and the emission of odor in exhaust gas are effectively performed. Can be suppressed.

[0032]

As described above in detail, according to the engine warming-up cooling system of the present invention, the inlet pipe is connected from the engine to the radiator, and the inlet pipe is connected from the radiator to the engine. Outlet pipe and thermostat installed in the above inlet pipe
A bypass passage communicating the upstream side of the water pump with a suction side of a water pump disposed in an outlet pipe; a communication passage communicating the discharge side of the water pump with the bypass passage; And the discharge flow of the water pump is communicated with the bypass passage.
To short-circuit the suction side and the discharge side of the water pump ,
Comprising a switching valve for communicating the discharge flow close the communication passage in the engine when the engine is warming state, by detecting the temperature of the engine, and a control device for controlling the opening and closing of the switching valve by the detection signal When the engine is cold,
Since the cooling water flow circulates through the cooling water circuit that is short-cut between the water pump, the three-way valve, the bypass passage, and the water pump, the cooling water is not circulated inside the engine. Engine warm-up is effectively promoted and emission of white smoke and emission of exhaust gas at low temperatures are suppressed,
As described above, the circulation of the cooling water is short-circuited, the work of the warp pump is reduced, and fuel saving can be achieved.

When the engine is warmed up, the cooling water flow circulates through the cooling water circuits of the water pump, the three-way valve, the engine and the water pump, so that the engine is cooled around its cylinders and the temperature inside the engine rises. Then, the above thermostat operates and introduces the cooling water to the radiator,
By configuring a cooling water circuit for the water pump, the three-way valve, the engine, the radiator, and the water pump, the engine is cooled and the engine can be operated smoothly.

According to a second aspect of the present invention, in the configuration of the first aspect, one end of the bypass passage is connected to an upstream side of the thermostat, and the other end is a suction port of the water pump. The communication path is formed such that 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 the discharge flow is configured to switch the bypass passage or the passage to the engine, a bypass passage connected to the upstream side of the thermostat is connected to the discharge side of a water pump, and is connected via the three-way valve. The warm-up can be promoted by a device having a simple structure that merely switches the bypass passage or the passage to the engine.

The engine warm-up facilitating cooling device of the present invention according to claim 3, in the structure according to claim 1 or 2, wherein said switching valve is formed by an electromagnetic valve, a thermostat, a three-way valve such as a pressure sensitive valve Therefore, since the engine internal temperature is detected, the engine can be quickly warmed up while cooling water is substantially retained in the engine until near the completion of the warming-up operation. It is possible to suppress emission of smoke and odor of exhaust gas.

In the invention according to any one of claims 1 to 3, the control device for controlling the opening and closing of the switching valve detects the engine temperature by detecting the engine cooling water, the lubricating oil, the cylinder head, and the like. If that is configured to detect the engine temperature inside such cylinder block, the inlet pipe, without being influenced by the easy temperature is cooled to the ambient air, such as the outlet pipe, accurately substantial temperature inside the engine With the temperature of the cooling water substantially retained in the engine, the warming-up of the inside of the engine can be rapidly promoted, and the emission of white smoke and the odor of exhaust gas at low temperatures can be suppressed (aspect 1). .

In the configuration according to the first aspect , when the thermostat opens and the cooling water flows through the radiator when the temperature in the vicinity of the cylinder reaches about 100 ° C., the engine can be accurately replaced with the engine. With the temperature of the cooling water substantially retained in the engine at the substantial temperature inside, it is possible to rapidly promote the warming of the inside of the engine,
The emission of white smoke and the odor of exhaust gas at low temperatures can be suppressed, and the internal temperature of the engine can be directly detected, so that seizure of the engine can be prevented (aspect 2) .

[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 portion P 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 view showing another conventional engine cooling device.

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

[Description of sign]

 Reference Signs List 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 three-way valve 14 communication passage 16 temperature detecting means 17 opening / closing means 20 control device

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F01P 7/16 502

Claims (3)

(57) [Claims] 1. A and inlet pipe connected from the engine to the radiator, and an outlet pipe connected to the engine from the radiator, on a thermostat disposed in the inlet pipe
Water pump disposed in the flow side and the outlet pipe
A bypass passage communicating with the suction side of the water pump; a communication passage communicating the discharge side of the water pump with the bypass passage; and closing the passage to the engine when the engine is cold to reduce the discharge flow of the water pump. It is communicated with the bypass passage
Te and short-circuiting the discharge side and the suction side of the water pump, the switching valve to the time of engine warming state to close the communication passage communicating the discharge flow to the engine, by detecting the temperature of the engine, the detection A control device for controlling opening and closing of the switching valve by a signal. 2. An end of the bypass passage is connected to an upstream side of the thermostat, and the other end is connected to a suction side of the water pump. It is formed so that it is connected to the discharge side and the other end is connected to the bypass passage, and the switching valve switches the discharge flow of the water pump to the bypass passage or the engine. The cooling device for accelerating warming-up of an engine according to claim 1, characterized in that: 3. The switching valve according to claim 1, wherein the switching valve is a solenoid valve, a thermostat,
Characterized in that it is formed in three-way valve such as a pressure sensitive valve,
The engine warming-up cooling device according to claim 1 or 2.