JP2623603B2 - Insulated engine cooling system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cooling device for an insulated engine made of a ceramic material or the like.

[Conventional technology]

Conventionally, regarding an engine cooling device, for example,
A water-cooled internal combustion engine described in JP-A-59-20521 is disclosed. The water-cooled internal combustion engine includes a water-cooled jacket, a radiator, a pump, and a fan.The cooling system control device includes a cylinder temperature sensor for detecting the temperature of the cylinder, and the jacket for detecting the temperature of the cooling water. Providing a jacket temperature sensor, operating the pump when the temperature of the cylinder is equal to or higher than a first set temperature and the temperature of the cooling water is equal to or higher than a second set temperature;
A fourth temperature in which the temperature of the cylinder is equal to or higher than a third set temperature higher than the first set temperature and the temperature of the cooling water is higher than the second set temperature.
A control circuit for rotating the fan when the temperature is equal to or higher than a set temperature is connected to outputs of the cylinder temperature sensor and the jacket temperature sensor.

Japanese Patent Application Laid-Open No. 57-191414 discloses a water pump control device for an engine. The water pump control device includes a drive device that can independently control the drive of the water pump with respect to the engine rotation, and a temperature sensor that detects the engine temperature. A control device for controlling the driving device so as to increase the rotation speed of the water pump when the rotation speed is high.

[Problems to be solved by the invention]

By the way, regarding the cooling system control device for the water-cooled internal combustion engine, the cooling system of the engine ideally performs a cooling operation by individually controlling the pump and the fan with two temperature parameters of the cooling water temperature and the cylinder temperature, The horsepower required for driving the pump and the fan can be used effectively. In particular, a pump and a fan horsepower are required at low load and high speed rotation, and not only can the output increase at low temperature and rapid acceleration be expected, but also the fuel efficiency at partial load can be improved. However, there is a problem in that the power source for driving the pump and the fan is the engine itself, the engine driving force is transmitted through mechanical power transmission means, and the driving of the pump and the fan follows the driving of the engine. doing.

By the way, a turbocharger generator as an energy recovery device of an adiabatic engine is provided with an AC machine between an exhaust blade that is a turbine blade and an intake blade that is a compressor impeller, and the AC machine is driven by an electric motor in accordance with a change in engine load. Or function as a generator, but in the turbocharger generator,
When the engine is running at high speed and high load, a large amount of electric power is generated. In order to effectively use such power generation, a combination with a device that consumes power when the engine is running at a high speed and under a high load is best. From this point of view, the water pump or cooling fan used for the cooling system of the engine needs to be actively operated especially when the load of the engine is large, and in other cases, the water pump or the cooling fan is not enough.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem. From the above-mentioned viewpoint, when the generator of the turbocharger has a large engine load, the flow rate of the exhaust gas is large, that is, the exhaust energy is abundant, and the load of the engine is large. Is small, the exhaust energy is small, and the power, that is, the recovered energy is effectively used by driving a water pump and a cooling fan for cooling the engine by the electric power generated by the turbocharger generator. Therefore, the water pump and the cooling fan are electrically driven independently of the engine driving, and the controller keeps the temperature of the engine cooling water and the oil temperature at the optimal state by the controller while detecting the temperature of the cooling water or the cylinder head. To provide an insulated engine cooling system controlled to A.

[Means for solving the problem]

The present invention is configured as follows to achieve the above object. That is, the present invention provides a generator provided in a turbocharger driven by exhaust gas of an engine, an electric cooling means for cooling cooling water driven by using electric power generated by the generator, and a cooling water for the engine. And a controller that controls the driving of the electric cooling means in response to a detection signal of the sensor, wherein the controller cools the cooling water whose temperature changes according to an engine load. Therefore, the operation of the electric cooling means is performed by using the electric power generated by the generator corresponding to the engine load in accordance with the temperature of the cooling water and the electric power generated by the generator and the electric cooling. The present invention relates to a cooling device for an insulated engine, wherein the cooling device controls the power consumption by matching the power consumption with the operation of the means.

Further, in this cooling device for an insulated engine, the electric cooling means is a water pump, and the sensors include a temperature sensor attached to the cylinder head body and a water temperature sensor attached to the water jacket.

Alternatively, in the cooling device for an insulated engine, the electric cooling means is a cooling fan, and the sensors include a temperature sensor attached to the cylinder head body and a water temperature sensor attached to the water jacket.

Further, in the cooling device for an adiabatic engine, the controller controls switching of a switching valve provided in a bypass passage that bypasses an oil passage that connects an oil cooler and an oil pan in response to a signal from an oil temperature sensor. is there.

[Action]

The cooling device for an insulated engine according to the present invention is configured as described above, and operates as follows. That is, according to the present invention, the electric cooling means is configured to be drivable by the electric power generated by the generator of the turbocharger, and the electric cooling means is controlled by the controller in response to the signal of the temperature detecting means. The power source of the water pump and cooling fan of the electric cooling means can be used by the electric power obtained by the energy recovery device. In addition to controlling the temperature of the cooling water or the cylinder head, the controller can control the temperature of the cooling water of the engine and the temperature of the oil to be always maintained in the optimum state by the controller. Further, if the oil cooler is bypassed by an electric switching valve, the oil temperature can be maintained at a constant state.

〔Example〕

Hereinafter, an embodiment of a cooling device for an insulated engine according to the present invention will be described in detail with reference to the drawings.

In FIG. 1, a cooling device for an insulated engine according to one embodiment of the present invention is indicated generally by the reference numeral 10. Although the detailed structure of the heat-insulated engine 1 is not shown, the piston, the cylinder liner, the cylinder head, and the like are configured in a heat-insulated structure, and include a partial heat-insulated structure in which a part of them is insulated. It is a thing.

In general, the cooling device 10 for an adiabatic engine cools only the cylinder head 2. Further, the insulated engine 1 is provided with a turbocharger generator 20 as an energy recovery device. The turbine 3 of the turbocharger generator 20 is the exhaust pipe 6 of the heat-insulated engine 1
, And the exhaust gas of the heat-insulated engine 1 is introduced into the turbine 3, and the compressor 5 is mounted on an intake pipe of the heat-insulated engine 1, and is configured to send intake air to the heat-insulated engine 1.

The turbocharger generator 20 is provided with an ultra-high-speed generator 4 composed of an AC machine between a discharge blade as a turbine blade of the turbine 3 and an intake blade as a compressor impeller of the compressor 5 in the turbocharger. The alternator 4 is made to function as an electric motor or a generator according to a change in load. As the turbocharger generator 20, for example, JP-A-60-195329, Japanese Patent Application No. 60-1900
Those described in No. 95 etc. can be applied. Therefore, a detailed description of the turbocharger generator 20 is omitted here.

In such a turbocharger generator 20, when the load on the adiabatic engine 1 is large, the flow rate of the exhaust gas is large, so the exhaust energy is abundant. However, when the load on the adiabatic engine 1 is small, the exhaust energy is small. Become. Therefore, when the adiabatic engine 1 is running at a high speed and under a high load, a large amount of electric power is generated in the turbocharger generator 20. By the way, the cooling system of the adiabatic engine will be described in detail. The heat generation rate of the engine almost shows a peak within a crank angle of 50 degrees after the top dead center, and does not generate heat in the subsequent stroke.

However, in the adiabatic engine 1 of the type in which only the cylinder head and the upper portion of the cylinder liner are cooled to insulate the others, the cooling system is small, and the water pump 9 or the cooling fan 8 used for cooling is particularly suitable for the load of the insulated engine 1. When it is large, it is necessary to operate vigorously, and at other times, it is not necessary to operate much. Therefore, the water pump 9 and the cooling fan 8 for cooling the adiabatic engine 1 are driven by the electric power generated from the turbocharger generator 20, so that the electric power can be effectively consumed. Moreover, in order to more effectively use the power generation amount of the turbocharger generator 20, that is, the recovered energy, the water pump 9 and the cooling fan 8 are driven while detecting the cooling water or the temperature of the cylinder head 2 to detect the cooling water or the temperature of the cylinder head 2.
The water temperature of the adiabatic engine 1 is always maintained in an optimum state.

FIG. 1 shows a structure in which a turbocharger generator 20, which is an energy recovery device, is provided for the insulated engine 1. The turbocharger generator 20
The electric power generated in is sent to the controller 11 through the line 18. The adiabatic engine 1 includes an electric water pump 9 for cooling the cylinder head 2 and an adiabatic engine 1.
An electric cooling fan 8 is provided to cool the cooling fan.

The controller 11 is configured to control the water pump 9 through a line 17 and the cooling fan 8 through a line 21. Further, the battery 12 is connected to the controller 11 through a line 37. Electric water pump 9
Is provided to circulate cooling water between the water jacket provided on the cylinder head 2 and the radiator 7 through circulation pipes 15, 16, and 24. The cylinder head 2 is provided with a water temperature sensor 13 or a temperature sensor 14 which is a temperature detecting means for directly or indirectly detecting the temperature of the cooling water. The temperature signal detected by the water temperature sensor 13 or 14 is sent to the controller via line 19
The controller 11 receives these signals and controls the operation of the electric water pump 9 and the electric cooling fan 8.

The turbocharger generator 20 includes a turbine 3, a compressor 5, and an AC machine 4 which is an ultra-high-speed generator. The electric power generated by the AC machine 4 passes through a controller 11 to an electric water pump 9 and an electric cooling fan 8. Consumed to drive. Further, when the heat insulating engine 1 is idling, the turbocharger generator 20
When the heat is not generated by the heat pump and the adiabatic engine 1 needs to be cooled, a battery is used to appropriately operate cooling means such as the electric water pump 9 and the electric cooling fan 8.
Battery 12 is connected to controller 11 so that power is supplied from 12.

Next, an example of a preferred heat insulating engine 1 to which the cooling device 10 for the heat insulating engine is applied will be described. The adiabatic engine 1 has a water jacket for cooling the cylinder head 2, but does not have a water jacket below the cylinder liner by insulating a part of the piston head and the cylinder liner. That is, the cylinder liner is divided so that the temperature does not become too high, the lower portion of the cylinder liner is configured to have a heat insulating structure, no water jacket is provided on the cylinder body located on the outer periphery of the cylinder liner, and air-cooled fins are provided. And so on.

As for the piston, the piston head facing the combustion chamber side of the engine is made of a ceramic material such as silicon nitride or silicon carbide, and the piston head is attached to the piston skirt via a heat insulating material made of a ceramic material. . Therefore, the heat flow, that is, heat in the combustion chamber can be prevented from being conducted to the lower cylinder liner side by the ceramic piston head and the heat insulating material such as the ceramic material.

Therefore, the water jacket can be provided only on the cylinder head 2 and the upper part of the cylinder liner located on the upper part. Therefore, the shape of the water jacket itself can be formed in a very simple structure, and the flow resistance of the cooling water can be reduced. And the capacity of the electric water pump 9 for circulating the cooling water can be reduced.

FIG. 2 shows a cooling apparatus 10 for an insulated engine according to the present invention.
FIG. 2 is a schematic explanatory diagram illustrating a cooling system of FIG. FIG. 2 shows an installation state of an oil cooler 25 which is a cooling means for oil which is lubricating oil. The oil cooler 25
Is provided for cooling the oil in the oil pan 35. The oil cooler 25 cools the oil pumped from the oil pan 35 through the oil passages 28 and 29 by the oil pump 26, and the cooled oil is returned to the oil pan 35 again through the oil passages 31 and 32.

The feature of the lubricating oil cooling system in the cooling device 10 of the heat insulating engine is, in particular, that an oil temperature sensor 33 is installed in an oil pan 35 for detecting the oil temperature, and the oil cooler 25 and the oil pan 35 are connected to each other. Communicating oil passages 29, 31
Is provided via a motor-operated switching valve 27. Switching valve 27 is an oil temperature sensor
In response to the oil temperature signal detected at 33, the control is performed by the controller 11 so as to be switchable.

That is, the switching valve 27 is a path through which the oil in the oil pan 35 cools and circulates the oil through the oil cooler 25, that is, the oil pan 35 → the oil passage 28 → the oil pump 26 → the oil passage 29 → the oil cooler 25 → Oil passage 31 → Switching valve 27
→ oil passage 32 → oil pan 35, and a path in which oil in oil pan 35 circulates without cooling oil by bypassing oil cooler 25, that is, oil pan 35 → oil passage 28 → oil pump 26 → bypass passage The configuration is such that switching can be made in the order of 30 → switching valve 27 → oil passage 32 → oil pan 35.

Next, an example of the operation of the cooling system of the cooling device 10 for an insulated engine according to the present invention will be described with reference to FIG. The temperature detecting means attached to the cylinder head 2 includes a temperature sensor 14 and a water temperature sensor 13 for indirectly or directly detecting the temperature of the cooling water. The temperature measurement location of the temperature sensor 14, that is, the installation location, is set so as to measure the temperature of the portion where the thermal load is severest, such as between the valve seats 22 and 23 of the intake and exhaust valves.

The temperature measurement location of the water temperature sensor 13, that is, the installation location, is installed in the water jacket of the cylinder head 2 so as to directly measure the cooling water temperature. First, the temperature detected by the temperature sensor 14 provided on the cylinder head 2 becomes equal to or higher than the set temperature, and the temperature signal is transmitted to the controller 11.
Is controlled by the controller 11 to operate the electric water pump 9. Subsequently, when the load of the adiabatic engine 1 increases or the engine is driven for a long time and the temperature of the cooling water rises, and the temperature detected by the water temperature sensor 13 exceeds the set temperature, the temperature signal is sent to the controller 11. When input, the controller 11 controls the electric cooling fan 8 to operate.

That is, the temperature detected by the temperature sensor 14 and the water temperature sensor
If the temperature difference between the temperature detected at 13 and the temperature difference exceeds the set temperature difference, the water temperature sensor 13 and / or the temperature sensor 14 may be damaged. A protection circuit and the like to be activated are incorporated.

Further, an oil temperature sensor 33 is installed in the oil pan 35 of the heat insulating engine 1. The oil temperature detected by the oil temperature sensor 33, that is, the oil temperature signal is input to the controller 11 through the line 34, and the oil temperature is detected. The controller 11 controls the electric switching valve 27, which is a three-way switching valve, to be switched by the controller 11 through the line 36 so that the temperature becomes optimum. That is, the cooling of the oil in the oil pan 35 is controlled by the controller 11 by cooling the oil through the oil cooler 25 or by returning to the oil pan 35 without cooling by bypassing the oil cooler 25.

As for the oil cooler 25, it is of course possible to reduce the size of the engine by incorporating the oil cooler 25 into the cylinder head 2. The cooling device 10 for an insulated engine according to the present invention is
The control by 11 minimizes the energy required to cool the adiabatic engine and keeps the oil temperature constant, so that a low friction engine can be provided. In particular, when the cylinder liner, the piston ring, and the like in the heat-insulated engine 1 are made of a ceramic material and the oil temperature is controlled, the effect of reducing friction is increased.

Further, regarding the control for driving the water pump 9, when the temperature of the cylinder head 2 or the temperature of the cooling water measured by the temperature sensor 14 or the water temperature sensor 13 is high, the flow rate of the circulating cooling water is increased. This can be done to reduce the flow rate of the circulating cooling water. Therefore, since the driving of the water pump 9 can be performed independently of the driving of the engine, the flow rate of the cooling water can be freely controlled regardless of the driving state of the engine. Therefore, the drive loss required for cooling the engine can be minimized.

〔The invention's effect〕

Since the cooling device for an insulated engine according to the present invention is configured as described above, it is possible to use the electric power obtained by the energy recovery device as a driving source for the water pump and the cooling fan, and to achieve effective use of energy. Furthermore, the circulation flow rate of the cooling water and oil and the air flow rate can be freely controlled by the controller independently of the driving of the engine according to the temperature signals of temperature detecting means such as a temperature sensor, a water temperature sensor and an oil temperature sensor, and The temperature of the cooling water and the temperature of the oil can always be maintained in the optimum state.

That is, in the turbocharger generator, a large amount of electric power is generated when the engine is running at high speed and high load, but the water pump or cooling fan used for the engine cooling system that needs to be actively operated when the engine load is large is used as the turbocharger. Since the power is driven by the power generated by the generator, the power consumption is extremely matched, and the power generation amount can be effectively used. Then, if the water pump and the cooling fan are driven while detecting the temperature of the cooling water or the cylinder head, the water temperature of the engine can always be maintained at an optimum state.

In addition, if the piston and the cylinder liner are configured in a heat-insulating structure, the water jacket on the outer peripheral portion of the cylinder becomes unnecessary, and a structure in which the water jacket is provided only in the cylinder head (in some cases, the water jacket is formed in the heat-insulating structure of the cylinder head, Water jacket only on liner)
Therefore, the passage of the water jacket itself can be configured in a simple shape in which the cooling water flows smoothly, the flow resistance of the cooling water can be reduced, and the water jacket can be configured to be small and the amount of water can be reduced, and the cooling water can be circulated. The water pump to be used can be made compact.

Therefore, when the cooling device for an insulated engine according to the present invention is applied to the insulated engine as described above, the power required to drive the water pump can be sufficiently covered by the power generated by the turbocharger generator, that is, the recovered energy. , Very suitable and preferred.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of a cooling apparatus for an insulated engine according to the present invention, and FIG. 2 is a schematic explanatory view explaining the principle of a cooling system in the cooling apparatus for an insulated engine according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Insulated engine, 2 ... Cylinder head, 3 ... Turbine, 4 ... Alternator, 7 ... Radiator, 8 ... Cooling fan, 9 ... Water pump, 10 ... Cooling device for insulated engine, 11 …… Controller, 13 …… Water temperature sensor,
14 ... Temperature sensor, 20 ... Turbocharger generator, 25 ... Oil cooler, 26 ... Oil pump, 27 ...
Switching valve, 28, 29, 31, 32 ... oil passage, 30 ... bypass passage, 33 ... oil temperature sensor, 35 ... oil pan.

Claims (4)

(57) [Claims] 1. A generator provided in a turbocharger driven by exhaust gas of an engine, an electric cooling means for cooling cooling water driven by using electric power generated by the generator, and a cooling water for the engine. A sensor for detecting a temperature, and a controller for controlling the driving of the electric cooling means in response to a detection signal from the sensor, wherein the controller cools the cooling water whose temperature changes according to an engine load. Therefore, the operation of the electric cooling means is performed by using the electric power generated by the generator in accordance with the engine load in accordance with the temperature of the cooling water, and the electric power generated by the generator and the electric cooling means are used. A cooling device for an adiabatic engine, wherein the cooling device controls the power consumption by matching the power consumption with the operation of the engine. 2. The electric cooling device according to claim 1, wherein the electric cooling means is a water pump, and the sensors comprise a temperature sensor mounted on a cylinder head body and a water temperature sensor mounted in a water jacket. A cooling device for an insulated engine according to claim 1. 3. A motor according to claim 1, wherein said electric cooling means is a cooling fan, and said sensors comprise a temperature sensor mounted on a cylinder head body and a water temperature sensor mounted in a water jacket. A cooling device for an insulated engine according to claim 1. 4. The controller according to claim 1, wherein the controller controls switching of a switching valve provided in a bypass passage that bypasses an oil passage that connects the oil cooler and the oil pan in response to a signal from an oil temperature sensor. 2. The cooling device for an insulated engine according to claim 1.