JP2004052734A - Internal combustion engine with heat storage device - Google Patents

Abstract

The present invention can effectively reduce friction of an internal combustion engine in an internal combustion engine configured to use a high-temperature cooling water stored in a heat storage tank to warm lubricating oil of the internal combustion engine. The task is to provide technology.
An internal combustion engine provided with a heat storage device according to the present invention includes a heat storage tank that stores a part of cooling water circulating in a head side cooling water passage and a block side cooling water passage of the internal combustion engine in a heat storage state, An oil heat exchanger that exchanges heat between the lubricating oil and the cooling water, and simultaneously the cooling water in the heat storage tank to the oil heat exchanger and the block-side cooling water passage when the internal combustion engine is cold. And a supply unit for supplying lubricating oil and the cylinder block of the internal combustion engine simultaneously using the high-temperature cooling water in the heat storage tank when the internal combustion engine is in a cold state.
[Selection] Fig. 8

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an internal combustion engine mounted on a vehicle or the like, and particularly to an internal combustion engine provided with a heat storage device.
[0002]
[Prior art]
In recent years, when the temperature of the internal combustion engine is low (cold state), the temperature of the internal combustion engine is quickly raised to improve startability, reduce the emission of unburned fuel components (improve exhaust emissions), For the purpose of improving the fuel consumption rate, etc., the development of an internal combustion engine equipped with a heat storage device is being promoted.
[0003]
As such an internal combustion engine, for example, a cooling system device for a vehicle internal combustion engine as described in JP-A-10-77834 is known. Such a cooling system device for an internal combustion engine for a vehicle includes a heat storage tank that stores cooling water circulating in a water-cooled internal combustion engine in a heat storage state, and an intake heat exchanger that performs heat exchange between intake air and cooling water of the internal combustion engine. And an oil heat exchanger that performs heat exchange between lubricating oil and cooling water of the internal combustion engine, and when the internal combustion engine is in a warm-up operation state, the high-temperature cooling water in the heat storage tank is heated by the intake heat. By flowing to the exchanger and / or the oil heat exchanger, the intake air amount air temperature and / or the lubricating oil temperature are increased.
[0004]
[Problems to be solved by the invention]
By the way, in the above-mentioned Japanese Patent Application Laid-Open No. H10-77834, although it is disclosed that the cooling water flowing through the intake heat exchanger and the oil heat exchanger flows into the internal combustion engine, the cooling water flowing into the internal combustion engine is disclosed. It does not disclose how water warms the internal combustion engine.
[0005]
For this reason, when the lubricating oil warmed by the oil heat exchanger flows into the internal combustion engine, the internal combustion engine itself may not be sufficiently warmed. Especially, since the cylinder block of the internal combustion engine has a relatively large heat capacity, if the cylinder block is not sufficiently warmed when the lubricating oil flows into the internal combustion engine, the heat of the lubricating oil is taken away by the cylinder block, and the lubrication oil is lubricated. The oil temperature will drop.
[0006]
Since the lubricating oil has a higher viscosity as the temperature becomes lower, it becomes difficult to reduce the friction of the internal combustion engine when the temperature of the lubricating oil is lowered in the internal combustion engine.
[0007]
The present invention has been made in view of the above-described circumstances, and relates to an internal combustion engine configured to warm lubricating oil of the internal combustion engine using high-temperature cooling water stored in a heat storage tank. It is an object of the present invention to provide a technique capable of effectively reducing the friction of the object.
[0008]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems. That is, the internal combustion engine provided with the heat storage device according to the present invention,
An internal combustion engine having a cylinder head and a cylinder block,
A head-side cooling water passage formed in the cylinder head,
A block-side cooling water passage formed in the cylinder block,
A heat storage tank that stores a part of the cooling water circulating in the head-side cooling water passage and the block-side cooling water passage in a heat storage state,
An oil heat exchanger that performs heat exchange between lubricating oil and cooling water circulating in the internal combustion engine,
Supply means for simultaneously supplying the cooling water in the heat storage tank to the oil heat exchanger and the block side cooling water passage when the internal combustion engine is in a cold state;
Was provided.
[0009]
The present invention provides an internal combustion engine including a heat storage tank that stores a part of cooling water circulating in the internal combustion engine in a heat storage state, wherein when the internal combustion engine is in a cold state, high-temperature cooling water in the heat storage tank is discharged. The greatest feature is that the lubricating oil of the internal combustion engine and the cylinder block are simultaneously heated by utilizing the same.
[0010]
In the internal combustion engine provided with such a heat storage device, when the internal combustion engine is in a cold state, the supply means supplies high-temperature cooling water in the heat storage tank to the oil heat exchanger and the block-side cooling water passage.
[0011]
When the high-temperature cooling water stored in the heat storage tank is supplied to the oil heat exchanger, the heat of the cooling water is transmitted to the lubricating oil in the oil heat exchanger, and the temperature of the lubricating oil rises.
[0012]
On the other hand, when the high-temperature cooling water stored in the heat storage tank is supplied to the block-side cooling water passage, heat of the cooling water is transmitted to the cylinder block through the wall surface of the block-side cooling water passage, and the temperature of the cylinder block rises.
[0013]
When the temperature of the lubricating oil and the temperature of the cylinder block both rise in this way, when the lubricating oil warmed by the oil heat exchanger flows into the internal combustion engine, it is difficult for the lubricating oil to be deprived of heat by the cylinder block. .
[0014]
As a result, a decrease in the temperature of the lubricating oil in the internal combustion engine is suppressed, and an increase in friction of the internal combustion engine due to a decrease in the temperature of the lubricating oil is suppressed.
[0015]
In the internal combustion engine provided with the heat storage device according to the present invention, the oil heat exchanger may be configured to perform heat exchange between lubricating oil and cooling water stored in an oil pan of the internal combustion engine. Good.
[0016]
Such heat exchangers include (1) a cooling water passage configured to surround part or all of the outer wall of an oil pan, or (2) a cooling water passage formed to be in contact with lubricating oil in the oil pan. A water passage or the like can be exemplified.
[0017]
When the oil pan is divided into a main oil pan and a sub-oil pan having a smaller storage capacity than the main oil pan, the heat exchanger uses the lubricating oil stored in the sub-oil pan and cooling water. It may be configured to perform heat exchange between them. In this case, since the absolute amount of the lubricating oil to be heated by the cooling water in the heat storage tank is reduced, the temperature of the lubricating oil is easily increased.
[0018]
In the internal combustion engine provided with the heat storage device according to the present invention, the oil heat exchanger may be a water-cooled oil cooler that cools lubricating oil of the internal combustion engine with cooling water.
[0019]
In an internal combustion engine provided with a heat storage device according to the present invention, the heat exchanger for oil is a heat exchanger configured to perform heat exchange between lubricating oil and cooling water stored in an oil pan of the internal combustion engine. And a water-cooled oil cooler provided in a lubricating oil circulation path.
[0020]
In this case, the supply means preferably supplies the cooling water in the heat storage tank to the oil heat exchanger and the water-cooled oil cooler when the internal combustion engine is in a cold state. This is to prevent the lubricating oil warmed in the oil heat exchanger from being unnecessarily cooled in the water-cooled oil cooler.
[0021]
Further, the internal combustion engine provided with the heat storage device according to the present invention may further include oil amount reducing means for reducing the amount of lubricating oil circulating in the internal combustion engine when the internal combustion engine is in a cold state. Good.
[0022]
In this case, since the amount of the lubricating oil circulating in the internal combustion engine is reduced, the absolute amount of the lubricating oil for cooling the cooling water in the heat storage tank is reduced, and as a result, the temperature of the lubricating oil is easily increased.
[0023]
Incidentally, as a method of reducing the amount of lubricating oil circulating in the internal combustion engine when the internal combustion engine is in a cold state, an oil pan of the internal combustion engine is divided into a plurality of oil pans, and the internal combustion engine is cooled in a cold state. In some cases, a method of circulating only lubricating oil stored in one of the plurality of oil pans to the internal combustion engine can be exemplified.
[0024]
At this time, the oil heat exchanger may be configured to perform heat exchange between only the lubricating oil stored in the one oil pan and the cooling water.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a specific embodiment of an internal combustion engine including a heat storage device according to the present invention will be described with reference to the drawings.
[0026]
<Embodiment 1>
First, a first embodiment of an internal combustion engine provided with a heat storage device according to the present invention will be described with reference to FIGS.
[0027]
FIG. 1 is a diagram showing a schematic configuration of a cooling water circulation system of an internal combustion engine to which the present invention is applied. The internal combustion engine 1 shown in FIG. 1 is a water-cooled internal combustion engine having a plurality of cylinders, and includes a cylinder head 1a, a cylinder block 1b, and an oil pan 1c.
[0028]
A head-side cooling water passage 2a and a block-side cooling water passage 2b through which cooling water flows are formed in the cylinder head 1a and the cylinder block 1b, respectively.
[0029]
The head-side cooling water passage 2 a is connected to the first cooling water passage 4. The first cooling water passage 4 is connected to a cooling water inlet of the radiator 5.
[0030]
The radiator 5 is a heat exchanger that exchanges heat between the cooling water and the outside air, and is configured such that the cooling water flowing from the cooling water inlet flows out from the cooling water outlet after the heat exchange with the outside air. Have been.
[0031]
A second cooling water passage 6 is connected to a cooling water outlet of the radiator 5. The second cooling water passage 6 is connected to a thermostat valve 7.
[0032]
The thermostat valve 7 is connected to a third cooling water channel 8 and a bypass water channel 9 in addition to the above-described second cooling water channel 6. When the temperature of the cooling water flowing through the thermostat valve 7 is lower than a predetermined valve opening temperature: T1, the thermostat valve 7 shuts off the second cooling water passage 6 and connects the third cooling water passage 8 to the bypass water passage 9. When the temperature of the cooling water flowing through the thermostat valve 7 is equal to or higher than the valve opening temperature: T1, the bypass water passage 9 is shut off and the second cooling water passage 6 and the third cooling water passage 8 are connected. I have.
[0033]
The third cooling water passage 8 is connected to a cooling water suction port of a mechanical water pump 10. The mechanical water pump 10 is configured to generate a flow of cooling water using a rotational torque of an output shaft (crankshaft) (not shown) of the internal combustion engine 1 as a drive source, and to supply the cooling water sucked from the cooling water suction port to the cooling water. Discharge from the discharge port. A fourth cooling water passage 11 is connected to a cooling water discharge port of the mechanical water pump 10, and the fourth cooling water passage 11 is connected to the block-side cooling water passage 2b.
[0034]
The bypass water passage 9 is connected to the head-side cooling water passage 2a of the internal combustion engine 1 and is a passage that bypasses the first cooling water passage 4, the radiator 5, and the second cooling water passage 6 to flow cooling water.
[0035]
Further, a first heater hose 12a is connected in the middle of the first cooling water passage 4 described above. The first heater hose 12 a is connected to a cooling water inlet of the heater core 13.
[0036]
The heater core 13 is a heat exchanger that performs heat exchange between the cooling water and the vehicle interior heating air, and cools after the cooling water is exchanged with the vehicle interior heating air from the cooling water inlet. It is configured to flow out of the water outlet.
[0037]
A second heater hose 12 b is connected to a cooling water outlet of the heater core 13. The second heater hose 12 b is connected to a part of the third cooling water passage 8.
[0038]
Further, a tank inflow passage 15 is connected to a part of the third cooling water passage 8 in the middle. The tank inflow passage 15 is connected to a cooling water inlet of the heat storage tank 16.
[0039]
The heat storage tank 16 is a container for storing the cooling water in a heat storage state, and when the cooling water flows in from the cooling water inlet, the cooling water stored in the heat storage tank 16 is replaced with the cooling water from the cooling water outlet. It is configured to discharge.
[0040]
A tank outflow passage 17 is connected to a cooling water outlet of the heat storage tank 16. The tank outflow passage 17 is connected to a part of the fourth cooling water passage 11.
[0041]
An electric water pump 18 is disposed in the middle of the tank inflow passage 15. The electric water pump 18 is configured to generate a flow of cooling water using electric power output from a battery or an alternator (not shown) as a driving source.
[0042]
In the middle of the tank outflow passage 17, a tank passage opening / closing valve 19 for opening and closing the tank outflow passage 17 is provided.
[0043]
Note that the electric water pump 18 does not necessarily need to be arranged in the tank inflow passage 15 and may be arranged in the tank outflow passage 17. The tank passage opening / closing valve 19 does not necessarily need to be arranged in the tank outflow passage 17 and may be arranged in the tank inflow passage 15. Further, both the electric water pump 18 and the tank passage opening / closing valve 19 may be arranged in one of the tank inflow passage 15 and the tank outflow passage 17.
[0044]
Next, a first oil heating water passage 20 is connected to a portion of the fourth cooling water passage 11 downstream of the connection portion of the tank outflow passage 17. The first oil heating water passage 20 is connected to a cooling water inlet of the oil heat exchanger 21.
[0045]
The oil heat exchanger 21 is a heat exchanger that exchanges heat between the lubricating oil of the internal combustion engine 1 and the cooling water, and the cooling water that flows in from the cooling water inlet is exchanged with the lubricating oil. After that, the cooling water flows out from the outlet.
[0046]
A second oil heating water passage 22 is connected to a cooling outlet of the oil heat exchanger 21. The second oil heating channel 22 is connected to a part of the bypass channel 9.
[0047]
An oil heating water channel opening / closing valve 23 for opening and closing the second oil heating water channel 22 is arranged in the middle of the second oil heating water channel 22. Note that the oil heating water passage opening / closing valve 23 does not necessarily need to be arranged in the second oil heating water passage 22, and may be arranged in the first oil heating water passage 20.
[0048]
The temperature of the cooling water flowing through the fourth cooling water channel 11, in other words, the temperature of the cooling water flowing into the block cooling water channel 2 b, is set near the connection portion of the fourth cooling water channel 11 with the block-side cooling water channel 2 b. An engine-side water temperature sensor 24 that outputs a corresponding electric signal is provided.
[0049]
An electronic control unit (ECU: Electronic Control Unit) 25 for controlling the flow of cooling water in the cooling water circulation system is provided in the cooling water circulation system of the internal combustion engine 1 configured as described above.
[0050]
The ECU 25 is an arithmetic and logic operation circuit including a CPU, a ROM, a RAM, a backup RAM, and the like. The ECU 25 may be provided independently of the ECU for controlling the operation state of the internal combustion engine 1, or may be used also as the ECU for controlling the operation state of the internal combustion engine 1. Good.
[0051]
The ECU 25 is connected to various sensors such as the above-described engine-side water temperature sensor 24, and is also electrically connected to various switches such as a heater switch 26 provided in the vehicle cabin, and outputs signals from these various sensors and various switches. The data is input to the ECU 25.
[0052]
Further, the ECU 25 is electrically connected to the heater hose opening / closing valve 14, the electric water pump 18, the tank passage opening / closing valve 19, and the oil heating water passage opening / closing valve 23. It is possible to control the heater hose opening / closing valve 14, the electric water pump 18, the tank passage opening / closing valve 19, and the oil heating water passage opening / closing valve 23 according to the signal.
[0053]
For example, when the internal combustion engine 1 is in the operating state, the mechanical water pump 10 operates by receiving the rotational torque of the crankshaft. On the other hand, the ECU 25 closes the heater hose on-off valve 14 to shut off the first heater hose 12a, stops the electric water pump 18, and closes the tank passage on-off valve 19 to shut off the tank outflow passage 17. Then, the oil heating water channel opening / closing valve 23 is closed to shut off the second oil heating water channel 22.
[0054]
In this case, the electric water pump 18 does not operate, and only the mechanical water pump 10 operates. If the temperature of the cooling water at this time is lower than the opening temperature T1 of the thermostat valve 7, the thermostat valve 7 does not operate. Cuts off the second cooling water passage 6 and makes the third cooling water passage 8 and the bypass water passage 9 conductive.
[0055]
Therefore, when the internal combustion engine 1 is in the operating state and the temperature of the cooling water is lower than the temperature T1 at which the thermostat valve 7 is opened, as shown in FIG. A circulation circuit in which cooling water flows in the order of the block-side cooling water passage 2b, the head-side cooling water passage 2a, the bypass water passage 9, the thermostat valve 7, the third cooling water passage 8, and the mechanical water pump 10 is established.
[0056]
When the circulation circuit as shown in FIG. 2 is established, the relatively low-temperature cooling water flowing out of the internal combustion engine 1 flows around the radiator 5, so that the cooling water is not unnecessarily cooled by the radiator 5. become. As a result, the warm-up of the internal combustion engine 1 is not hindered.
[0057]
Thereafter, when the warming-up of the internal combustion engine 1 proceeds and the temperature of the cooling water becomes equal to or higher than the opening temperature T1 of the thermostat valve 7, the thermostat valve 7 opens the second cooling water channel 6 and simultaneously shuts off the bypass water channel 9. The second cooling water passage 6 and the third cooling water passage 8 are electrically connected.
[0058]
In this case, as shown in FIG. 3, the mechanical water pump 10 → the fourth cooling channel 11 → the block side cooling channel 2b → the head side cooling channel 2a → the first cooling channel 4 → the radiator 5 → the second cooling channel 6 → the thermostat. A circulation circuit through which the cooling water flows in the order of the valve 7 → the third cooling water passage 8 → the mechanical water pump 10 is established.
[0059]
When the circulation circuit shown in FIG. 3 is established, the high-temperature cooling water that has absorbed the heat of the internal combustion engine 1 flows through the radiator 5, so that the heat of the cooling water is released to the atmosphere at the radiator 5, and the cooling water is discharged. And the temperature of the cooling water decreases. As a result, the relatively low-temperature cooling water after passing through the radiator 5 flows into the head-side cooling water passage 2a and the block-side cooling water passage 2b of the internal combustion engine 1, and the heat of the internal combustion engine 1 is transmitted to the cooling water. Thus, overheating of the internal combustion engine 1 is prevented.
[0060]
When the heater switch 26 is switched from off to on when the internal combustion engine 1 is in the operating state and the temperature of the cooling water is equal to or higher than the opening temperature T1 of the thermostat valve 7, the ECU 25 sets the first heater hose The heater hose opening / closing valve 14 is opened to make 12a conductive, the electric water pump 18 is stopped, the tank passage opening / closing valve 19 is closed to shut off the tank outflow passage 17, and the second oil heating water passage 22 is shut off. The oil heating water channel opening / closing valve 23 is closed as much as possible.
[0061]
In this case, as shown in FIG. 4, the same circulation circuit as the circulation circuit described in the description of FIG. 3 described above is established, and at the same time, the mechanical water pump 10 → the fourth cooling water passage 11 → the block side cooling water passage 2b → the head. A circulation circuit in which cooling water flows in the order of the side cooling water passage 2a → the first cooling water passage 4 → the first heater hose 12a → the heater core 13 → the second heater hose 12b → the third cooling water passage 8 → the mechanical water pump 10 is established.
[0062]
When a circulation circuit as shown in FIG. 4 is established, high-temperature cooling water that has absorbed heat of the internal combustion engine 1 flows into the heater core 13 via the first cooling water passage 4 → the first heater hose 12a. In the heater core 13, the heat of the cooling water is transmitted to the air for heating the vehicle interior. As a result, the temperature of the air for indoor heating is increased, so that the temperature in the vehicle interior can be increased.
[0063]
Next, when the internal combustion engine 1 is in a warm-up operation state after a cold start, the ECU 25 warms up the internal combustion engine 1 by using high-temperature cooling water (hereinafter, referred to as heat storage hot water) in the heat storage tank 16. Is performed to promote the warm-up.
[0064]
Here, when the internal combustion engine 1 is in the warm-up operation state after the cold start, the temperature of the internal combustion engine 1 itself decreases and the temperature of the lubricating oil circulating in the internal combustion engine 1 also decreases.
[0065]
As shown in FIG. 5, the lubricating oil has such a property that the viscosity increases as the temperature of the lubricating oil decreases, and the viscosity decreases as the temperature of the lubricating oil increases. Therefore, when the internal combustion engine 1 is in a warm-up operation state after a cold start, the viscosity of the lubricating oil increases.
[0066]
When the viscosity of the lubricating oil is high, between the piston and the cylinder wall surface, the bearing portion of the piston pin in the connecting rod, the bearing portion of the crank pin in the connecting rod, the bearing portion of the crank journal in the cylinder block 1b, and the valve mechanism Since the friction increases in various sliding portions such as, the fuel consumption of the internal combustion engine 1 tends to increase.
[0067]
On the other hand, when the internal combustion engine 1 is in the warm-up operation state after the cold start, the high-temperature cooling water (hereinafter, referred to as heat storage hot water) in the heat storage tank 16 is supplied to the oil heat exchanger 21. Thus, a method of raising the temperature of the lubricating oil to an appropriate temperature can be considered.
[0068]
However, as shown in FIG. 6, the oil circulation path of the internal combustion engine 1 is lubricated in the order of oil pan 1c → oil strainer 200 → oil pump 201 → oil heat exchanger 21 → oil filter 202 → cylinder block / oil passage 203. The oil flows, and then the lubricating oil in the cylinder block / oil passage 203 is supplied to the crank journal 204, crank pin 205, connecting rod 206, piston 207, cylinder head / oil passage 208, camshaft journal 209, or valve train 210. It is configured to be distributed to each sliding part.
[0069]
That is, the oil circulation path of the internal combustion engine 1 is such that the lubricating oil warmed in the oil heat exchanger 21 passes through the cylinder block / oil passage 203, and then the crank journal 204, the crankpin 205, the connecting rod 206, the piston 207, the cylinder The head oil passage 208, the camshaft journal 209, or the valve train 210 is distributed to each sliding portion.
[0070]
Therefore, if the lubricating oil warmed in the oil heat exchanger 21 flows into the cylinder block / oil passage 203 and the cylinder block 1b is in a cold state, the heat of the lubricating oil is taken by the cylinder block 1b. As a result, it becomes difficult to supply an appropriate temperature lubricating oil to each of the above-mentioned sliding portions.
[0071]
In particular, since the cylinder block 1b has a large heat capacity among the members constituting the internal combustion engine 1, when the lubricating oil warmed in the oil heat exchanger 21 flows into the low-temperature cylinder block / oil passage 203, the heat of the lubricating oil Of the lubricating oil is transmitted to the cylinder block 1b, and the temperature of the lubricating oil supplied to each of the sliding portions described above may be excessively low.
[0072]
Therefore, in the warm-up promotion process according to the present embodiment, the ECU 25 warms the lubricating oil using the hot water stored in the heat storage tank 16 and simultaneously warms the cylinder block 1b.
[0073]
Specifically, when the internal combustion engine 1 is in the warm-up operation state after the cold start, the ECU 25 operates the electric water pump 18 and opens the tank passage opening / closing valve 19 so as to make the tank outflow passage 17 conductive. Then, the oil heating water channel opening / closing valve 23 is opened so as to make the second oil heating water channel 22 conductive.
[0074]
In this case, as shown in FIG. 7, the electric water pump 18 → tank inflow passage 15 → heat storage tank 16 → tank outflow passage 17 → fourth cooling at the same time that the circulation circuit as described in the above description of FIG. 2 is established. A first circulation circuit through which cooling water flows in the following order: water channel 11 → block side cooling water channel 2b → head side cooling water channel 2a → bypass water channel 9 → thermostat valve 7 → third cooling water channel 8 → tank inflow passage 15 → electric water pump 18 , Electric water pump 18 → tank inflow passage 15 → heat storage tank 16 → tank outflow passage 17 → fourth cooling water passage 11 → first oil heating water passage 20 → oil heat exchanger 21 → second oil heating water passage 22 → bypass Cooling water flows in the order of water passage 9 → thermostat valve 7 → third cooling water passage 8 → tank inflow passage 15 → electric water pump 18. And 2 of the circulating circuit is established.
[0075]
When the above-described first circulation circuit is established, the cooling water discharged from the electric water pump 18 flows into the heat storage tank 16 via the tank inflow passage 15, and is originally stored in the heat storage tank 16 instead of the cooling water. High-temperature cooling water (hereinafter referred to as heat storage hot water) is discharged to the tank outflow passage 17.
[0076]
The heat storage hot water discharged from the heat storage tank 16 to the tank outflow passage 17 flows into the block side cooling water passage 2b of the internal combustion engine 1 via the tank outflow passage 17 → the fourth cooling water passage 11.
[0077]
When the heat storage hot water flows into the block-side cooling water passage 2b, the heat of the heat storage hot water is transmitted to the cylinder block 1b via the wall surface of the block-side cooling water passage 2b, so that the temperature of the cylinder block 1b rises quickly.
[0078]
On the other hand, when the above-described second circulation circuit is established, the cooling water discharged from the electric water pump 18 flows into the heat storage tank 16 through the tank inflow passage 15 and is originally stored in the heat storage tank 16 instead of the cooling water. The stored heat storage water is discharged to the tank outflow passage 17.
[0079]
The heat storage hot water discharged from the heat storage tank 16 to the tank outflow passage 17 flows into the oil heat exchanger 21 via the tank outflow passage 17 → the fourth cooling water passage 11 → the first oil heating water passage 20.
[0080]
When the heat storage hot water flows into the oil heat exchanger 21, the heat of the heat storage hot water is transferred to the lubricating oil in the oil heat exchanger 21, so that the temperature of the lubricating oil quickly rises.
[0081]
When the cylinder block 1b and the lubricating oil are simultaneously heated as described above, the temperature of the cylinder block 1b is increased when the lubricating oil warmed in the oil heat exchanger 21 flows into the cylinder block / oil passage 203. Therefore, the amount of heat transmitted from the lubricating oil to the cylinder block 1b is suppressed.
[0082]
As a result, the lubricating oil that has passed through the cylinder block / oil passage 203, in other words, the lubricating oil distributed from the cylinder block / oil passage 203 to each sliding portion has a high temperature and a low viscosity.
[0083]
Hereinafter, the warm-up promotion process according to the present embodiment will be specifically described with reference to FIG.
[0084]
FIG. 8 is a flowchart illustrating a warm-up promotion control routine according to the present embodiment. The warm-up promotion control routine is a routine stored in the ROM of the ECU 25 in advance, and is a routine that the ECU 25 repeatedly executes at predetermined time intervals when the internal combustion engine 1 is in the operating state.
[0085]
In the warm-up promotion control routine, the ECU 25 first determines in step S801 whether or not “1” is stored in the warm-up promotion processing flag storage area preset in the RAM. The warm-up promotion processing flag storage area is a storage area in which “1” is set when the execution of the warm-up promotion processing ends, and “0” is reset when the operation of the internal combustion engine 1 is stopped or started.
[0086]
If it is determined in step S801 that "1" is stored in the warm-up promotion processing flag storage area, the ECU 25 determines that the warm-up promotion processing has already been performed, and ends the execution of this routine.
[0087]
On the other hand, if it is determined in step S801 that “1” is not stored in the warm-up promotion flag storage area, that is, if “0” is stored in the warm-up promotion flag storage area, The ECU 25 proceeds to S802 and inputs an output signal value (engine-side water temperature) of the engine-side water temperature sensor 24: THWe.
[0088]
In step S803, the ECU 25 determines whether the engine-side water temperature THWe input in step S802 is lower than a predetermined temperature. The above-mentioned predetermined temperature is a temperature corresponding to the engine-side water temperature when the internal combustion engine 1 is in the warm-up completed state.
[0089]
If it is determined in step S803 that the engine-side water temperature THWe is equal to or higher than the predetermined temperature, the ECU 25 determines that the warm-up promotion process does not need to be performed because the internal combustion engine 1 is in the warm-up completed state. The execution of this routine ends once.
[0090]
If it is determined in S803 that the engine-side water temperature THWe is lower than the predetermined temperature, the ECU 25 executes a warm-up promotion process in S804 to S806.
[0091]
Specifically, the ECU 25 first opens the tank passage opening / closing valve 19 in S804 to make the tank outflow passage 17 conductive.
[0092]
In S805, the ECU 25 opens the oil heating water channel opening / closing valve 23 so as to make the second oil heating water channel 22 (and the first oil heating water channel 20) conductive.
[0093]
In S806, the ECU 25 operates the electric water pump 18.
[0094]
In this case, the first circulation circuit and the second circulation circuit as described in the description of FIG. 7 are simultaneously established, and the heat storage hot water stored in the heat storage tank 16 is supplied to the block-side cooling water passage 2b and the heat for oil. It will be supplied to the exchanger 21.
[0095]
When the heat storage hot water is supplied to the block-side cooling water passage 2b and the oil heat exchanger 21, heat of the heat storage hot water is transmitted to the lubricating oil in the oil heat exchanger 21, and at the same time, the heat storage hot water flows in the block-side cooling water passage 2b. Is transmitted to the cylinder block 1b. That is, the lubricating oil and the cylinder block 1b are simultaneously heated by the heat storage hot water stored in the heat storage tank 16.
[0096]
As a result, when the lubricating oil warmed in the oil heat exchanger 21 flows into the cylinder block / oil passage 203, the temperature of the cylinder block 1b rises, so that the lubricating oil is removed from the lubricating oil in the cylinder block / oil passage 203. The amount of heat transmitted to the cylinder block 1b is suppressed, so that the lubricating oil distributed from the cylinder block / oil passage 203 to each sliding portion can be kept at an appropriate temperature.
[0097]
Here, returning to the warm-up promotion control routine of FIG. 8, the ECU 25 starts the counter: C in S807. Counter: C is a counter that measures the elapsed time from the start of the warm-up promotion process.
[0098]
In S808, the ECU 25 determines whether or not the measured time C of the counter C has become equal to or longer than a predetermined time. The predetermined time is, for example, a time required until all the heat storage hot water stored in the heat storage tank 16 is supplied to the block-side cooling water passage 2b and the oil heat exchanger 21.
[0099]
If it is determined in S808 that the measurement time C of the counter C is shorter than the predetermined time, the ECU 25 repeatedly executes the processing of S808 until the measurement time C of the counter C becomes equal to or longer than the predetermined time. I do.
[0100]
If it is determined in S808 that the measurement time C of the counter C is equal to or longer than the predetermined time, the ECU 25 executes the processing of S809 to S811 to end the execution of the warm-up promotion processing.
[0101]
In S809, the ECU 25 stops the operation of the electric water pump 18.
[0102]
In S810, the ECU 25 closes the oil heating water channel opening / closing valve 23 to shut off the second oil heating water channel 22.
[0103]
In S811, the ECU 25 closes the tank passage opening / closing valve 19 to shut off the tank outflow passage 17.
[0104]
When the processes of S809 to S811 are executed, the circulation circuit as described in the description of FIG. 2 is established, and the execution of the warm-up promotion process is ended. However, if the temperature of the cooling water has risen to the opening temperature of the thermostat valve 7: T1 or more at the time when the processing of S809 to S811 is executed, the circulation circuit as described in the description of FIG. Holds, and the warm-up promotion process is ended.
[0105]
In S812, the ECU 25 resets the measurement time of the counter: C.
[0106]
In S813, the ECU 25 sets “1” in the warm-up promotion flag storage area of the RAM, and ends the execution of this routine.
[0107]
As described above, when the internal combustion engine 1 is in the cold state, the heat storage hot water simultaneously warms the cylinder block 1b and the lubricating oil by the ECU 25 executing the warm-up promotion control routine. It is possible to suppress the amount of heat transmitted from the lubricating oil to the cylinder block 1b when flowing into the cylinder block / oil passage 203.
[0108]
In this case, since the lubricating oil distributed from the cylinder block / oil passage 203 to each sliding portion has a high temperature and a low viscosity, friction in each sliding portion is reduced, and as a result, the internal combustion engine 1 It is possible to improve the fuel consumption rate.
[0109]
Although the present embodiment has been described by taking as an example a configuration in which a dedicated oil heat exchanger 21 for transmitting the heat of the heat storage hot water to the lubricating oil is provided, the internal combustion engine 1 is provided with a water-cooled oil cooler in advance. If provided, the heat of the heat storage hot water may be transmitted to the lubricating oil using a water-cooled oil cooler without providing the oil heat exchanger 21. In this case, since it is not necessary to newly provide a dedicated oil heat exchanger, it is possible to suppress the manufacturing cost.
[0110]
<Embodiment 2>
Next, a second embodiment of the internal combustion engine including the heat storage device according to the present invention will be described with reference to FIG. Here, a configuration different from that of the above-described first embodiment will be described, and a description of a similar configuration will be omitted.
[0111]
The difference between the first embodiment and the present embodiment is that the first embodiment circulates the entire amount of the lubricating oil during the warm-up operation of the internal combustion engine 1, whereas the present embodiment is different from the first embodiment. In this case, only a part of the lubricating oil is circulated during the warm-up operation of the internal combustion engine 1.
[0112]
FIG. 9 is a diagram illustrating a configuration of the oil pan 1c according to the present embodiment. The oil pan 1c in the present embodiment includes an oil pan cover 100 that covers the bottom surface of the cylinder block 1b, and is configured so that lubricating oil is stored in the oil pan cover 100.
[0113]
The space inside the oil pan cover 100 is divided by a partition 101 into a first oil storage chamber 102 and a second oil storage chamber 103.
[0114]
In the partition 101, a thermostat valve 104 is provided near the bottom surface of the oil pan cover 100. Thermostat valve 104 closes when the temperature of lubricating oil in first oil storage chamber 102 is lower than a predetermined temperature, and the temperature of lubricating oil in first oil storage chamber 102 is equal to or higher than the predetermined temperature. It is configured to open sometimes. The above-mentioned predetermined temperature is a temperature corresponding to the temperature of the lubricating oil when the internal combustion engine 1 is in the warm-up completed state.
[0115]
In the first oil storage chamber 102, the tip of an oil passage 200a whose base end is connected to an oil pump 201 (not shown) protrudes, and an oil strainer 200 is fixed to the tip of the oil passage 200a. ing.
[0116]
In the oil pan 1c thus configured, when the temperature of the lubricating oil in the first oil storage chamber 102 is lower than a predetermined temperature, such as when the internal combustion engine 1 is in a cold state, the thermostat valve 104 is closed. Since the valve is opened, the flow of the lubricating oil between the first oil storage chamber 102 and the second oil storage chamber 103 is shut off.
[0117]
In this case, only the lubricating oil in the first oil storage chamber 102 is sucked up by the oil strainer 200 and circulates through the internal combustion engine 1. That is, when the temperature of the lubricating oil is lower than the predetermined temperature, only the lubricating oil in the first oil storage chamber 102 among the lubricating oils stored in the oil pan 1c circulates through the internal combustion engine 1. .
[0118]
On the other hand, when the temperature of the lubricating oil in the first oil storage chamber 102 rises to the predetermined temperature or higher, the thermostat valve 104 opens, so that the first oil storage chamber 102 and the second oil storage The flow of lubricating oil between the chamber 103 and the chamber 103 is allowed.
[0119]
In this case, the lubricating oil in the second oil storage chamber 103 can circulate in the internal combustion engine 1 in addition to the lubricating oil in the first oil storage chamber 102. That is, in a situation where the temperature of the lubricating oil has risen to a predetermined temperature or higher, all the lubricating oil stored in the oil pan 1c circulates through the internal combustion engine 1.
[0120]
Therefore, according to the oil pan 1c described above, when the temperature of the lubricating oil is low, such as when the internal combustion engine 1 is in a warm-up operation state after a cold start, the amount of the lubricating oil circulating in the internal combustion engine 1 Will decrease.
[0121]
When the amount of lubricating oil circulating in the internal combustion engine 1 decreases when the internal combustion engine 1 is in a warm-up operation state after a cold start, the amount of lubricating oil to be heated by the heat storage hot water in the warm-up acceleration process decreases. In addition, the amount of heat transmitted from the heat storage hot water to the lubricating oil per unit amount increases, and it becomes easy to increase the temperature of the lubricating oil.
[0122]
As a result, the temperature of the lubricating oil supplied to each sliding portion of the internal combustion engine 1 is further increased, so that the friction of the internal combustion engine 1 is easily reduced, and the fuel consumption rate of the internal combustion engine 1 can be improved. It will be easier.
[0123]
<Embodiment 3>
Next, a third embodiment of the internal combustion engine provided with the heat storage device according to the present invention will be described with reference to FIGS. Here, a configuration different from that of the above-described first embodiment will be described, and a description of a similar configuration will be omitted.
[0124]
The difference between the first embodiment described above and the present embodiment is that in the first embodiment described above, the oil heat exchanger 21 is disposed in the middle of the oil circulation path formed in the internal combustion engine 1. In contrast to warming the lubricating oil, the present embodiment is characterized in that the lubricating oil stored in the oil pan 1c is warmed.
[0125]
FIG. 10 is a diagram showing a schematic configuration of a cooling water circulation system of the internal combustion engine 1 in the present embodiment. In the cooling water circulation system of the internal combustion engine 1 in the present embodiment, a first tank outflow passage 17 a is connected to a cooling water outlet of the heat storage tank 16. The first tank outflow passage 17a is connected to the flow path switching valve 27.
[0126]
In addition to the above-described first tank outflow passage 17a, a second tank outflow passage 17b and an oil heating water passage 28 are connected to the flow passage switching valve 27. The flow path switching valve 27 shuts off any one of the first tank outflow passage 17a, the second tank outflow passage 17b, and the oil heating water passage 28, or connects the first tank outflow passage 17a with the second tank outflow passage 17a. The tank outflow passage 17b and the oil heating water passage 28 are all opened.
[0127]
The second tank outflow passage 17b is connected to a portion in the middle of the fourth cooling water passage 11, and the oil heating water passage 28 penetrates the oil pan 1c and is connected to a portion in the middle of the block side cooling water passage 2b. I have.
[0128]
In the cooling water circulation system of the internal combustion engine 1 configured as described above, when the internal combustion engine 1 is in the operating state, the ECU 25 closes the heater hose opening / closing valve 14 to shut off the first heater hose 12a, The pump 18 is stopped, and the flow path switching valve 27 is controlled so as to shut off the first tank outflow passage 17a.
[0129]
In this case, the electric water pump 18 does not operate, and only the mechanical water pump 10 operates. If the temperature of the cooling water at this time is lower than the opening temperature T1 of the thermostat valve 7, the thermostat valve 7 does not operate. Cuts off the second cooling water passage 6 and makes the third cooling water passage 8 and the bypass water passage 9 conductive.
[0130]
Therefore, when the internal combustion engine 1 is in the operating state and the temperature of the cooling water is lower than the temperature T1 at which the thermostat valve 7 is opened, as shown in FIG. A circulation circuit in which cooling water flows in the order of the block-side cooling water passage 2b, the head-side cooling water passage 2a, the bypass water passage 9, the thermostat valve 7, the third cooling water passage 8, and the mechanical water pump 10 is established.
[0131]
When the circulation circuit shown in FIG. 11 is established, the relatively low-temperature cooling water flowing out of the internal combustion engine 1 flows around the radiator 5, so that the cooling water is not unnecessarily cooled by the radiator 5. become. As a result, the warm-up of the internal combustion engine 1 is not hindered.
[0132]
Thereafter, when the warming-up of the internal combustion engine 1 proceeds and the temperature of the cooling water becomes equal to or higher than the opening temperature T1 of the thermostat valve 7, the thermostat valve 7 opens the second cooling water channel 6 and simultaneously shuts off the bypass water channel 9. The second cooling water passage 6 and the third cooling water passage 8 are electrically connected.
[0133]
In this case, as shown in FIG. 12, the mechanical water pump 10 → the fourth cooling water passage 11 → the block side cooling water passage 2b → the head side cooling water passage 2a → the first cooling water passage 4 → the radiator 5 → the second cooling water passage 6 → the thermostat. A circulation circuit through which the cooling water flows in the order of the valve 7 → the third cooling water passage 8 → the mechanical water pump 10 is established.
[0134]
When the circulation circuit shown in FIG. 12 is established, the high-temperature cooling water that has absorbed the heat of the internal combustion engine 1 flows through the radiator 5, so that the heat of the cooling water is released to the atmosphere at the radiator 5, and the cooling water And the temperature of the cooling water decreases. As a result, the relatively low-temperature cooling water after passing through the radiator 5 flows into the head-side cooling water passage 2a and the block-side cooling water passage 2b of the internal combustion engine 1, and the heat of the internal combustion engine 1 is transmitted to the cooling water. Thus, overheating of the internal combustion engine 1 is prevented.
[0135]
When the heater switch 26 is switched from off to on when the internal combustion engine 1 is in the operating state and the temperature of the cooling water is equal to or higher than the opening temperature T1 of the thermostat valve 7, the ECU 25 sets the first heater hose The heater hose opening / closing valve 14 is opened to make 12a conductive, the electric water pump 18 is stopped, and the flow path switching valve 27 is controlled to shut off the first tank outflow passage 17a.
[0136]
In this case, as shown in FIG. 13, the same circulation circuit as the circulation circuit described in the description of FIG. 12 is established, and at the same time, the mechanical water pump 10 → the fourth cooling water path 11 → the block side cooling water path 2b → the head. A circulation circuit in which cooling water flows in the order of the side cooling water passage 2a → the first cooling water passage 4 → the first heater hose 12a → the heater core 13 → the second heater hose 12b → the third cooling water passage 8 → the mechanical water pump 10 is established.
[0137]
When a circulation circuit as shown in FIG. 13 is established, high-temperature cooling water that has absorbed heat of the internal combustion engine 1 flows into the heater core 13 through the first cooling water passage 4 → the first heater hose 12a. In the heater core 13, the heat of the cooling water is transmitted to the air for heating the vehicle interior. As a result, the temperature of the air for indoor heating is increased, so that the temperature in the vehicle interior can be increased.
[0138]
Next, when the internal combustion engine 1 is in a warm-up operation state after a cold start, the ECU 25 warms up the internal combustion engine 1 by using high-temperature cooling water (hereinafter, referred to as heat storage hot water) in the heat storage tank 16. Is performed to promote the warm-up.
[0139]
In the warm-up promotion processing according to the present embodiment, the ECU 25 warms the lubricating oil in the oil pan 1c using the heat storage hot water in the heat storage tank 16 and also heats the cylinder block 1b.
[0140]
Specifically, when the internal combustion engine 1 is in a warm-up operation state after a cold start, the ECU 25 activates the electric water pump 18 and simultaneously operates the first tank outflow passage 17a and the second tank outflow passage 17b. The flow path switching valve 27 is controlled so that the oil heating water passage 28 and the oil heating water passage 28 are all conducted.
[0141]
In this case, as shown in FIG. 14, at the same time as the circulation circuit described in the description of FIG. 11 is established, the electric water pump 18 → the tank inflow passage 15 → the heat storage tank 16 → the first tank outflow passage 17a → Flow path switching valve 27 → second tank outflow passage 17 b → fourth cooling water passage 11 → block side cooling water passage 2 b → head side cooling water passage 2 a → bypass water passage 9 → thermostat valve 7 → third cooling water passage 8 → tank inflow passage 15 A third circulation circuit through which cooling water flows in the order of the electric water pump 18, an electric water pump 18, a tank inflow passage 15, a heat storage tank 16, a first tank outflow passage 17a, a flow passage switching valve 27, and an oil heating water passage 28. → block side cooling water channel 2b → head side cooling water channel 2a → bypass water channel 9 → thermostat valve 7 → third cooling water channel 8 → tank inflow Road 15 → the fourth circulation circuit through which cooling water flows in the forward of the electric water pump 18 is established.
[0142]
When the third circulation circuit described above is established, the cooling water discharged from the electric water pump 18 flows into the heat storage tank 16 via the tank inflow passage 15 and is originally stored in the heat storage tank 16 instead of the cooling water. High-temperature cooling water (hereinafter referred to as heat storage hot water) is discharged to the first tank outflow passage 17a.
[0143]
The heat storage hot water discharged from the heat storage tank 16 to the first tank outflow passage 17a passes through the first tank outflow passage 17a → the flow path switching valve 27 → the second tank outflow passage 17b → the fourth cooling water passage 11 to be used for the internal combustion engine. 1 flows into the block-side cooling water passage 2b.
[0144]
When the heat storage hot water flows into the block-side cooling water passage 2b, the heat of the heat storage hot water is transmitted to the cylinder block 1b via the wall surface of the block-side cooling water passage 2b, so that the temperature of the cylinder block 1b rises quickly.
[0145]
On the other hand, when the fourth circulation circuit described above is established, the cooling water discharged from the electric water pump 18 flows into the heat storage tank 16 via the tank inflow passage 15 and is originally stored in the heat storage tank 16 instead of the cooling water. The stored heat storage water is discharged to the first tank outflow passage 17a.
[0146]
The heat storage hot water discharged from the heat storage tank 16 to the first tank outflow passage 17a passes through the oil pan 1c via the first tank outflow passage 17a → the flow path switching valve 27 → the oil heating water passage 28.
[0147]
When the heat storage hot water passes through the oil pan 1c, the heat of the heat storage hot water is transmitted to the lubricating oil in the oil pan 1c via the wall surface of the oil heating water passage 28, so that the temperature of the lubricating oil quickly rises. Become.
[0148]
When the cylinder block 1b and the lubricating oil are simultaneously heated as described above, the temperature of the cylinder block 1b is increased when the lubricating oil warmed in the oil heat exchanger 21 flows into the cylinder block / oil passage 203. Therefore, the amount of heat transmitted from the lubricating oil to the cylinder block 1b is suppressed.
[0149]
As a result, the lubricating oil that has passed through the cylinder block / oil passage 203, in other words, the lubricating oil distributed from the cylinder block / oil passage 203 to each sliding portion has a high temperature and a low viscosity.
[0150]
Hereinafter, the warm-up promotion process according to the present embodiment will be specifically described with reference to FIG.
[0151]
FIG. 15 is a flowchart illustrating a warm-up promotion control routine according to the present embodiment. The warm-up promotion control routine is a routine stored in the ROM of the ECU 25 in advance, and is a routine that the ECU 25 repeatedly executes at predetermined time intervals when the internal combustion engine 1 is in the operating state.
[0152]
In the warm-up promotion control routine, the ECU 25 first determines in step S1501 whether “1” is not stored in the warm-up promotion processing flag storage area preset in the RAM.
[0153]
If it is determined in step S1501 that "1" is stored in the warm-up promotion processing flag storage area, the ECU 25 determines that the warm-up promotion processing has already been performed, and ends the execution of this routine.
[0154]
On the other hand, if it is determined in step S1501 that “1” is not stored in the warm-up promotion flag storage area, that is, if “0” is stored in the warm-up promotion flag storage area, The ECU 25 proceeds to S1502, and inputs an output signal value of the engine-side water temperature sensor 24 (engine-side water temperature): THWe.
[0155]
In S1503, the ECU 25 determines whether or not the engine-side water temperature THWe input in S1502 is lower than a predetermined temperature. The above-mentioned predetermined temperature is a temperature corresponding to the engine-side water temperature when the internal combustion engine 1 is in the warm-up completed state.
[0156]
If it is determined in step S1503 that the engine-side water temperature THWe is equal to or higher than the predetermined temperature, the ECU 25 determines that the warm-up promotion process does not need to be performed because the internal combustion engine 1 is in the warm-up completed state. The execution of this routine ends once.
[0157]
If it is determined in step S1503 that the engine-side water temperature THWe is lower than the predetermined temperature, the ECU 25 executes a warm-up promotion process in steps S1504 to S1505.
[0158]
Specifically, first, in S1504, the ECU 25 controls the flow path switching valve 27 so as to make all of the first tank outflow passage 17a, the second tank outflow passage 17b, and the oil heating water passage 28 conductive.
[0159]
In S1505, the ECU 25 operates the electric water pump 18.
[0160]
When the processes in S1504 and S1505 are performed, the third circulation circuit and the fourth circulation circuit as described in the description of FIG. 14 are simultaneously established, and the heat storage stored in the heat storage tank 16 is performed. Hot water is supplied to the block-side cooling water passage 2b and the oil heating water passage 28.
[0161]
When the heat storage hot water is supplied to the block side cooling water passage 2b and the oil heating water passage 28, the heat of the heat storage hot water flowing through the oil heating water passage 28 is transmitted to the lubricating oil in the oil pan 1c via the wall surface of the oil heating water passage 28. At the same time, heat of the heat storage hot water is transmitted to the cylinder block 1b in the block-side cooling water passage 2b. That is, the lubricating oil in the oil pan 1c and the cylinder block 1b are simultaneously heated by the heat storage hot water stored in the heat storage tank 16.
[0162]
As a result, when the lubricating oil warmed in the oil pan 1c flows into the cylinder block / oil passage 203, the temperature of the cylinder block 1b rises. The amount of heat transmitted to 1b is suppressed, so that the lubricating oil distributed from the cylinder block / oil passage 203 to each sliding portion can be kept at an appropriate temperature.
[0163]
Here, returning to the warm-up promotion control routine of FIG. 15, the ECU 25 starts the counter: C in S1506. Counter: C is a counter that measures the elapsed time from the start of the warm-up promotion process.
[0164]
In S1507, the ECU 25 determines whether or not the measured time C of the counter C has become equal to or longer than a predetermined time. The predetermined time is, for example, a time required until all the heat storage hot water stored in the heat storage tank 16 is supplied to the block-side cooling water passage 2b and the oil heat exchanger 21.
[0165]
If it is determined in S1507 that the measurement time C of the counter C is shorter than the predetermined time, the ECU 25 repeatedly executes the processing of S1507 until the measurement time C of the counter C becomes equal to or longer than the predetermined time. I do.
[0166]
If it is determined in S1507 that the measurement time C of the counter C is equal to or longer than the predetermined time, the ECU 25 executes the processing of S1508 to S1509 to end the execution of the warm-up promotion processing.
[0167]
In S1508, the ECU 25 stops the operation of the electric water pump 18.
[0168]
In S1509, the ECU 25 controls the flow path switching valve 27 to shut off the first tank outflow passage 17a.
[0169]
When the processing of S1508 to S1509 described above is performed, the circulation circuit as described in the description of FIG. 11 is established, and the execution of the warm-up promotion processing is terminated. However, if the temperature of the cooling water has risen to the opening temperature of the thermostat valve 7: T1 or more at the time when the above-described processing of S1508 to S1509 is executed, the circulation circuit as described with reference to FIG. Holds, and the warm-up promotion process is ended.
[0170]
In S1510, the ECU 25 resets the measurement time of the counter: C.
[0171]
In S1511, the ECU 25 sets “1” in the warm-up promotion flag storage area of the RAM, and ends the execution of this routine.
[0172]
As described above, when the internal combustion engine 1 is in the cold state, the heat storage hot water simultaneously warms the cylinder block 1b and the lubricating oil by the ECU 25 executing the warm-up promotion control routine. It is possible to suppress the amount of heat transmitted from the lubricating oil to the cylinder block 1b when flowing into the cylinder block / oil passage 203.
[0173]
In this case, since the lubricating oil distributed from the cylinder block / oil passage 203 to each sliding portion has a high temperature and a low viscosity, friction in each sliding portion is reduced, and as a result, the internal combustion engine 1 It is possible to improve the fuel consumption rate.
[0174]
In the present embodiment, the case where the warm-up promotion processing is executed after the start of the internal combustion engine 1 has been described as an example. However, the warm-up promotion processing may be executed before the start of the internal combustion engine 1. .
[0175]
Further, in the present embodiment, the case where the internal combustion engine 1 is not provided with a water-cooled oil cooler has been described as an example. However, when the internal combustion engine 1 is provided with a water-cooled oil cooler, the warm-up acceleration process is performed. It is preferable to add the heat storage hot water to the block-side cooling water passage 2b and the oil heating water passage 28 and also supply the water to the water-cooled oil cooler at the time of the execution.
[0176]
This is because if the low-temperature cooling water is flowing through the water-cooled oil cooler when the warm-up promotion process is executed, the lubricating oil warmed in the oil pan 1c is inadvertently cooled in the water-cooled oil cooler and lubricated. This is because the viscosity of the oil increases.
[0177]
<Embodiment 4>
Next, a fourth embodiment of the internal combustion engine provided with the heat storage device according to the present invention will be described with reference to FIG. Here, a configuration different from the above-described third embodiment will be described, and a description of a similar configuration will be omitted.
[0178]
The difference between the third embodiment and the present embodiment is that the third embodiment circulates the entire amount of the lubricating oil during the warm-up operation of the internal combustion engine 1, whereas the third embodiment differs from the third embodiment. In this case, only a part of the lubricating oil is circulated during the warm-up operation of the internal combustion engine 1.
[0179]
FIG. 16 is a diagram illustrating a configuration of an oil pan 1c according to the present embodiment.
[0180]
The oil pan 1c in the present embodiment includes an oil pan cover 100 that covers the bottom surface of the cylinder block 1b, and is configured to store lubricating oil in the oil pan cover 100.
[0181]
The space inside the oil pan cover 100 is divided by a partition 101 into a first oil storage chamber 102 and a second oil storage chamber 103.
[0182]
In the partition 101, a thermostat valve 104 is provided near the bottom surface of the oil pan cover 100. Thermostat valve 104 closes when the temperature of lubricating oil in first oil storage chamber 102 is lower than a predetermined temperature, and the temperature of lubricating oil in first oil storage chamber 102 is equal to or higher than the predetermined temperature. It is configured to open sometimes. The above-mentioned predetermined temperature is a temperature corresponding to the temperature of the lubricating oil when the internal combustion engine 1 is in the warm-up completed state.
[0183]
In the first oil storage chamber 102, the tip of an oil passage 200a whose base end is connected to an oil pump 201 (not shown) protrudes, and an oil strainer 200 is fixed to the tip of the oil passage 200a. ing.
[0184]
In the first oil storage chamber 102, a part of the oil heating water passage 28 is disposed, and between the cooling water flowing in the oil heating water passage 28 and the lubricating oil in the first oil storage chamber 102. Heat exchange is performed.
[0185]
In the oil pan 1c configured as described above, when the internal combustion engine 1 is in the warm-up operation state after the cold start, the temperature of the lubricating oil in the first oil storage chamber 102 becomes lower than the predetermined temperature. The thermostat valve 104 closes to shut off the flow of lubricating oil between the first oil storage chamber 102 and the second oil storage chamber 103.
[0186]
In this case, only the lubricating oil in the first oil storage chamber 102 is sucked up by the oil strainer 200 and circulates through the internal combustion engine 1. That is, when the temperature of the lubricating oil is lower than the predetermined temperature, only the lubricating oil in the first oil storage chamber 102 among the lubricating oils stored in the oil pan 1c circulates through the internal combustion engine 1. .
[0187]
Further, when the internal combustion engine 1 is in the warm-up operation state after the cold start, the warm-up acceleration processing is executed, so that the heat storage hot water stored in the heat storage tank 16 flows through the oil heating water passage 28. Become.
[0188]
In this case, the heat of the heat storage hot water flowing through the oil heating water passage 28 is transmitted to the lubricating oil in the first oil storage chamber 102 through the wall surface of the oil heating water passage 28, and the lubricating oil in the first oil storage chamber 102 is Temperature rises.
[0189]
As described above, in the internal combustion engine including the heat storage device according to the present embodiment, when the internal combustion engine 1 is in the warm-up operation state after the cold start, only the lubricating oil in the first oil storage chamber 102 is used for the internal combustion engine. 1 and at the same time, only the lubricating oil in the first oil storage chamber 102 is heated by the heat storage hot water.
[0190]
That is, in the internal combustion engine provided with the heat storage device according to the present embodiment, when the internal combustion engine 1 is in the warm-up operation state after the cold start, the amount of the lubricating oil circulating in the internal combustion engine 1 decreases, and accordingly, As a result, the amount of lubricating oil to be heated by the heat storage hot water is reduced.
[0191]
As a result, since the amount of heat transferred from the heat storage hot water to the lubricating oil per unit amount increases, the temperature of the lubricating oil supplied to each sliding portion of the internal combustion engine 1 further increases. 1, the friction at each sliding portion is easily reduced, and the fuel consumption rate of the internal combustion engine 1 is improved.
[0192]
【The invention's effect】
According to the internal combustion engine provided with the heat storage device according to the present invention, when the internal combustion engine is in a cold state, the lubricating oil and the cylinder block are simultaneously heated by using the high-temperature cooling water in the heat storage tank. The heat of the oil is not taken away by the cylinder block, and the temperature drop of the lubricating oil in the internal combustion engine is suppressed.
[0193]
As a result, an increase in friction of the internal combustion engine due to a decrease in the temperature of the lubricating oil is suppressed, and it is possible to improve the fuel consumption rate of the internal combustion engine.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a cooling water circulation system of an internal combustion engine according to a first embodiment.
FIG. 2 is a diagram showing a flow of cooling water during a warm-up operation of the internal combustion engine.
FIG. 3 is a diagram showing a flow of cooling water after completion of warm-up of the internal combustion engine.
FIG. 4 is a diagram showing a flow of cooling water when the vehicle cabin heating device is in an operating state.
FIG. 5 is a diagram showing a relationship between temperature and viscosity of lubricating oil.
FIG. 6 is a block diagram showing a configuration of an oil circulation path of the internal combustion engine.
FIG. 7 is a diagram showing a flow of cooling water when a warm-up promotion process is performed.
FIG. 8 is a flowchart illustrating a warm-up promotion control routine according to the first embodiment;
FIG. 9 is a diagram illustrating a configuration of an oil pan according to a second embodiment.
FIG. 10 is a diagram showing a schematic configuration of a cooling water circulation system of an internal combustion engine according to a third embodiment.
FIG. 11 is a diagram showing a flow of cooling water during a warm-up operation of the internal combustion engine.
FIG. 12 is a diagram showing a flow of cooling water after completion of warm-up of the internal combustion engine.
FIG. 13 is a diagram showing the flow of cooling water when the vehicle interior heating device is in an operating state.
FIG. 14 is a diagram showing a flow of cooling water when a warm-up promotion process is performed.
FIG. 15 is a flowchart illustrating a warm-up promotion control routine according to a third embodiment;
FIG. 16 is a diagram showing a configuration of an oil pan according to a fourth embodiment.
[Explanation of symbols]
1 ... Internal combustion engine
1a ... Cylinder head
1b ・ ・ ・ Cylinder block
1c ... oil pan
2a: Head side cooling water channel
2b: Block side cooling water channel
15 ・ ・ ・ Tank inflow passage
16 ... heat storage tank
17 ・ ・ ・ Tank outflow passage
18 ・ ・ ・ Electric water pump
19 ・ ・ ・ Tank passage opening / closing valve
20: first oil heating channel
21 ... oil heat exchanger
22... Second oil heating channel
23 ・ ・ ・ Oil heating water channel opening / closing valve
25 ... ECU
27 ・ ・ ・ Flow path switching valve
28 ・ ・ ・ Oil heating channel
100 oil pan cover
101 ... partition wall
102 ・ ・ First oil storage chamber
103 Second oil storage chamber
104 thermostat valve

Claims (6)

An internal combustion engine having a cylinder head and a cylinder block,
A head-side cooling water passage formed in the cylinder head,
A block-side cooling water passage formed in the cylinder block,
A heat storage tank that stores a part of the cooling water circulating in the head-side cooling water passage and the block-side cooling water passage in a heat storage state,
An oil heat exchanger that performs heat exchange between lubricating oil and cooling water circulating in the internal combustion engine,
Supply means for simultaneously supplying the cooling water in the heat storage tank to the oil heat exchanger and the block side cooling water passage when the internal combustion engine is in a cold state;
An internal combustion engine equipped with a heat storage device, comprising: The internal combustion engine according to claim 1, wherein the oil heat exchanger performs heat exchange between lubricating oil and cooling water in an oil pan provided in the internal combustion engine. . The internal combustion engine according to claim 1, wherein the oil heat exchanger is a water-cooled oil cooler provided in a lubricating oil circulation path. The oil heat exchanger includes a heat exchanger that exchanges heat between lubricating oil and cooling water in an oil pan provided in the internal combustion engine, and a water-cooled oil cooler provided in a lubricating oil circulation path. With
The supply unit supplies high-temperature cooling water in the heat storage tank to the heat exchanger, the water-cooled oil cooler, and the block-side cooling water passage when the internal combustion engine is in a cold state. An internal combustion engine comprising the heat storage device according to claim 1. The heat storage device according to any one of claims 1 to 4, further comprising oil amount reducing means for reducing an amount of lubricating oil circulating in the internal combustion engine when the internal combustion engine is in a cold state. Internal combustion engine equipped with. Further comprising a plurality of oil pans for storing the lubricating oil of the internal combustion engine,
The oil amount reducing means circulates only the lubricating oil stored in one of the plurality of oil pans to the internal combustion engine when the internal combustion engine is in a cold state. An internal combustion engine comprising the heat storage device according to claim 5.

Images