JP3427418B2 - Engine heat storage device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine heat storage device in which a heat storage device is provided in a cooling water passage of an engine having a cylinder head and a cylinder block.

[0002]

2. Description of the Related Art Generally, when the engine is started, the engine is not warmed up, so that atomization of the fuel is deteriorated and flames are extinguished on the wall surface of the combustion chamber. Is getting worse.

By the way, since the fuel atomization failure and the extinction in the combustion chamber, which cause deterioration of emission performance and fuel efficiency performance at the time of engine start in a cold state, are eliminated during engine warming, If the temperature of the cylinder head in which the combustion chamber is formed and the temperature of the intake and fuel supply systems adjacent to the cylinder head are first warmed up when starting the engine, the above cause should be eliminated.

Therefore, in order to improve such a state,
For example, as shown in FIG. 24, a heater e and a heat accumulator f are provided in a cooling water passage d for introducing the cooling water sent from the cylinder head b of the engine a into the cylinder block c of the engine a by a water pump, and heating by the heater e is performed. At the same time, there is known a technique of increasing the temperature of the cooling water when the engine is cold by radiating heat from the heat storage device f, thereby promoting early warm-up of the engine a. In FIG. 24, g is a thermostat and h is a radiator.

[0005]

However, in such a technique, the engine cooling water whose temperature has been raised by heat dissipation from the heat storage device provided in the cooling water passage is first introduced into the cylinder block of the engine, and then the cylinder block. Since it reaches the head, the limited amount of heat released from the heat accumulator is absorbed by the cylinder block with a large heat capacity, which lowers the temperature of the engine cooling water and warms the cylinder head. The machine is not fully done.

Further, as described in, for example, Japanese Utility Model Publication No. 51-41318, an engine preheater is provided in the cooling water passage of the engine, and the temperature of the engine cooling water is heated by the heat obtained by burning kerosene in the preheater. Is known, and it is conceivable to use such an engine preheater, but such an engine preheater does not have a heat storage function, so unless it is based on the combustion of the fuel supplied separately. , Engine cooling water can not be heated.

According to the present invention, the amount of heat released from the heat storage device provided in the cooling water passage of the engine is intensively used for warming up the portion that causes the deterioration of the emission performance and the fuel consumption performance when the engine is cold. Therefore, it is an object of the present invention to improve the combustion efficiency of fuel when the engine is cold, and to provide a heat storage device of the engine that further improves emission performance.

[0008]

The invention of claim 1 is premised on an engine heat storage device in which a heat storage device is provided in a cooling water passage of an engine having a cylinder head and a cylinder block. The water passage introduces the cooling water supplied by the water pump into the cylinder block at least when the engine is warm, and the cooling water supplied by the water pump at least when the engine is cold. A second cooling water passage that is introduced into the cylinder head independently of the block is provided, and the heat storage device is provided in the second cooling water passage.

According to the invention of claim 2, in the invention of claim 1, the upstream end of the first cooling water passage is connected to the cylinder head, and the upstream end of the second cooling water passage is connected to the first cooling water passage. A passage opening / closing valve that is connected and that opens the second cooling water passage when the engine is cold and closes the engine when the engine is warm is provided in the second cooling water passage. According to a third aspect of the invention, in the first aspect of the invention, the first cooling water passage has an upstream end connected to the cylinder block, and the second cooling water passage has an upstream end connected to the cylinder head. The water passage is provided with a first passage opening / closing valve that opens the first cooling water passage when the engine is cold and closes the engine when the engine is warm.
The second cooling water passage is provided with a second passage opening / closing valve that opens the second cooling water passage when the engine is cold and closes the engine when the engine is warm, and the first cooling water passage and the second cooling water passage are provided. And a communication passage, and a communication passage opening / closing valve that closes the communication passage when the engine is cold and opens the engine when the engine is warm is provided in the communication passage.

Further, in the invention of claim 4, in the invention of claim 1, the upstream end of the first cooling water passage is connected to the cylinder head, and the upstream end of the second cooling water passage is connected to the first cooling water passage. First and second temperature sensors connected to the cylinder head and the cylinder block for detecting temperatures related to the cylinder head and the cylinder block are provided, and the cylinder passage and the cylinder block are connected to each other when the engine is cold. When the temperatures detected by the first and second temperature sensors are both lower than or equal to a predetermined temperature, the second cooling water passage is connected and the first cooling water passage is disconnected. In the invention of claim 5, the flow passage switching valve is connected to the cylinder block through the communication passage, and the flow passage switching valve is detected by the first and second temperature sensors when the engine is cold. When at least one of the temperatures exceeds a predetermined temperature, the second cooling water passage is communicated and the cylinder block is communicated with the second cooling water passage through the communication passage.

According to a sixth aspect of the present invention, in a heat storage device for an engine in which a heat storage device is provided in a cooling water passage of an engine having a cylinder head and a cylinder block, the cooling water passage is cooled by a water pump. A first cooling water passage for introducing water into the cylinder block, a second cooling water passage for introducing cooling water supplied by a water pump into the cylinder head through a heat accumulator, and an engine cooling passage provided in the second cooling water passage. In the meantime, when the heat storage is completed, while introducing the cooling water into the cylinder head from the second cooling water passage,
When the engine is cold and the heat storage is not completed, a flow path opening / closing valve that restricts the introduction of the cooling water from the second cooling water passage to the cylinder head is provided.

[0012]

According to the first aspect of the present invention, the cooling water delivered from the engine is introduced into the cylinder block of the engine through the first cooling water passage at least when the engine is warm. Further, the cooling water sent from the engine is introduced into the cylinder head of the engine at least when the engine is cold by the second cooling water passage provided with the heat storage device. At this time, the heat released from the heat accumulator is intensively transferred to the cylinder head via the cooling water, and the cylinder head is quickly warmed up with almost no heat loss.

According to the second aspect of the invention, when the engine is cold, the second cooling water passage is opened by the passage opening / closing valve, and the cooling water sent from the cylinder head flows through the second cooling water passage to store heat. Heat is applied from the container and is introduced again into the cylinder head. As a result, the heat released from the heat accumulator is concentratedly transferred to the cylinder head.

According to the invention of claim 3, when the engine is cold, the communication passage is closed by the communication passage opening / closing valve, and the first and second cooling water passages are formed by the first passage opening / closing valve and the second passage opening / closing valve. Are opened, and the first cooling water passage and the second cooling water passage form two independent cooling water passages substantially independent of each other. The cooling water sent from the cylinder head of the engine is given heat from the heat accumulator while flowing through the second cooling water passage and is introduced again into the cylinder head of the engine. As a result, the heat released from the heat accumulator is intensively transferred to the cylinder head via the cooling water, and the cylinder head is quickly warmed up.

According to the fourth aspect of the present invention, both temperatures detected by the first and second temperature sensors, which are temperatures related to the temperatures of the cylinder head and the cylinder block when the engine is cold, are both predetermined temperatures. In the following, the flow path switching valve connects the second cooling water passage and cuts off the communication of the first cooling water passage. As a result, the heat released from the heat accumulator is intensively transferred to the cylinder head via the cooling water, the cylinder head is quickly warmed up, and the cooling water in the cylinder block is stopped, so that the cylinder block can be quickly heated. Warmed up.

According to the fifth aspect of the present invention, when the engine is cold and at least one of the temperatures detected by the first and second temperature sensors exceeds a predetermined temperature, the flow passage switching valve causes the second cooling water to flow. The cylinder block communicates with the second cooling water passage through the communication passage and the communication passage.
As a result, the heat released from the heat accumulator is intensively transferred to the cylinder head and the cylinder block via the cooling water, and the cylinder head and the cylinder block are quickly warmed up.

According to the sixth aspect of the present invention, when the engine is cold and the heat storage is completed, the flow passage switching valve introduces the cooling water from the second cooling water passage into the cylinder head, and the cooling water is discharged from the heat storage device. Heat is intensively transferred to the cylinder head via the cooling water. Further, when the engine is cold and the heat storage is not completed, the passage switching valve restricts the introduction of the cooling water from the second cooling water passage to the cylinder head, so that the heat accumulator does not absorb heat from the cooling water, and the warming is prevented. The opportunity is accelerated.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

-Embodiment 1-In the engine heat storage device 1A whose schematic configuration is shown in FIG. 1, 2 is a first cooling water passage, 3 is a second cooling water passage, and 2
The upstream end of the cooling water passage 3 is connected to the first cooling water passage 2.

The first cooling water passage 2 has its upstream end connected to the cylinder head 5 of the engine 4 and its downstream end connected to the cylinder block 6. Then, the engine cooling water is circulated by the first water pump 7 in the order of cylinder block 6 → cylinder head 5 → first cooling water passage 2 → cylinder block 6, and in the meantime, an indoor heater 8 if necessary. Is configured to be preheated by. Further, when the engine cooling water rises above a predetermined temperature, the flow passage is switched by the operation of the flow passage switching valve 9 that operates by sensing the temperature of the thermostat, and the engine cooling water is positively cooled by flowing through the radiator 10. To be done.

On the other hand, in the second cooling water passage 3, a passage opening / closing valve 11, a second water pump 12, and a heat storage device 13 are provided in this order from the upstream side to the downstream side, and are discharged from the heat storage device 13. The heat loss is reduced when heat is transferred to the cylinder head 5 through the engine cooling water.
The heat accumulator 13 preferably uses, for example, barium hydroxide as a heat storage medium, and the second water pump 12 transmits a normal engine output so that the second water pump 12 can be operated even before the engine is started. It is preferable to use an electromagnetic water pump or the like instead of the driven water pump.

In order to transfer the heat released from the heat accumulator 13 to the intake system of the engine and the like so that a good fuel combustion state can be obtained, the second cooling water passage 3 is provided with a heat storage. In the process of introducing into the cylinder head 5 the engine cooling water that has been heated by the device 13 and has risen in temperature, the engine cooling water is configured to pass through the intake manifold 14 located close to the cylinder head 5. It is also designed to apply heat.

In the engine heat storage device 1A thus constructed, the flow path opening / closing valve 11 is opened when the engine is started in the cold state.
The engine cooling water circulates in the second cooling water passage 3 and the cylinder head 5 by operating the
The heat emitted from the cylinder head 5 can be given to the cylinder head 5 in an intensive manner, and the cylinder head 5 can be warmed up early. Then, in the process, heat is also applied to the intake manifold 14 through which the second cooling water passage 3 passes,
The temperature is also increasing.

Deterioration of fuel atomization in a cold state after starting the engine 4 and deterioration of emission performance due to generation of HC due to extinction on the wall surface of the combustion chamber is caused for about 30 seconds to 1 minute after starting the engine. Since the emission performance tends to improve when the above time elapses, the cylinder head 5 and the intake where the combustion chamber is located and the combustion chamber are located at the time of starting the engine or within an extremely short time after starting the engine. The manifold 14 and the like are warmed up.

Therefore, the engine heat storage device 1A improves the deterioration of the emission performance and eliminates the deterioration of the fuel consumption performance.

After the engine 4 is warmed up and is in a steady operation state, the flow passage opening / closing valve 11 is closed by control based on the cooling water temperature, the elapsed time after the engine is started, or the like. As a result, a normal cooling water passage through which the engine cooling water sent from the cylinder head 5 of the engine 4 is introduced into the cylinder block 6 is formed.
Stable running of the automobile is obtained, and during this running, the heat storage device 13 stores heat by collecting heat from the engine cooling water whose temperature has risen.

By the way, for example, barium hydroxide used as a heat storage medium of the heat storage unit 13 becomes liquid when the temperature is raised to about 78 to 90 ° C., while it stores heat when it radiates heat, and becomes a temperature of about 50 ° C., for example. Is solid and does not emit heat. However, the temperature of the engine cooling water may not rise to the temperature range in which the heat storage action is performed when the vehicle is traveling in a cold region or when traveling is short distance.

Therefore, in the above-described embodiment, the temperature of the cooling water flowing through the second cooling water passage 3 is raised to a temperature higher than the temperature due to the heat transfer during the warm-up operation of the engine, and the temperature at which the heat is stored in the regenerator 13. In order to reliably raise the temperature of the cooling water, the compensating heater 20 is arranged in the second cooling water passage 3 on the upstream side of the heat accumulator 13. The compensating heater 20 preferably uses electricity as a heat source, and the compensating temperature sensor 21 is provided in the cooling water passage near the cooling water outlet of the cylinder head 5 through which the cooling water constantly flows. The temperature of the cooling water is measured by, and the temperature of the cooling water is controlled by turning on and off the compensating heater 20 based on the measured temperature.

The heat storage device 13 is installed in a cabin (not shown) in order to keep the driver and passengers warm by direct or indirect radiant heat. Then, the heat accumulator 1 is installed in the cabin, so that the heat accumulator 1
The heat retention property of 3 is improved.

-Embodiment 2- The engine heat storage device 1B, whose schematic configuration is shown in FIG.
The cooling water passage 2a and the second cooling water passage 3a are configured to form two independent cooling water passages that are substantially independent of each other when the engine is cold.

The upstream end of the first cooling water passage 2a is connected to the cylinder block 6, and the upstream end of the second cooling water passage 3a is connected to the cylinder head 5, and the first cooling water passage 2a is connected.
The second cooling water passage 3a and the second cooling water passage 3a are connected by a communication passage 16 including a communication passage opening / closing valve 15. The first cooling water passage 2a is provided with a first passage opening / closing valve 17, and the second cooling water passage 3a is provided with a second passage opening / closing valve 18, respectively.

In FIG. 2, constituent elements similar to those of the engine heat storage apparatus 1A of the first embodiment and having similar functions are denoted by the same reference numerals, and detailed description thereof will be omitted.

With the above arrangement, in the engine heat storage device 1B, the communication passage opening / closing valve 15 is closed while the first passage opening / closing valve 17 and the second passage are opened when the engine is started in the cold state. By opening the on-off valves 18 respectively, the first cooling water passage 2a that circulates the cooling water only in the cylinder block 6 and the second cooling water passage 3a that circulates the cooling water only in the cylinder head 5 substantially. Two independent cooling water passages are formed.

In this state, the second water pump 1
By activating 2, the heat released from the heat accumulator 13 is intensively transferred to the cylinder head 5 via the cooling water to warm it up. In the process, the intake manifold 1 through which the second cooling water passage 3a passes
The temperature of 4 will also rise.

After the engine 4 is warmed up and is in a steady operation state, the communication passage opening / closing valve 15 is opened while performing the same control as the control in the first embodiment.
The first flow path opening / closing valve 17 and the second flow path opening / closing valve 18 are closed.

As a result, a normal cooling water passage through which the cooling water sent from the cylinder head 5 of the engine 4 is introduced into the cylinder block 6 is formed, so that the vehicle runs stably and the heat is accumulated in the heat accumulator 13. .

Further, in the heat accumulator 13 provided in the second cooling water passage 3a, it is possible to promptly store heat after heat dissipation.

That is, it is the oil of the automatic transmission that has the fastest temperature rise of the liquid used in the vehicle after the engine is started, and reaches 120 to 130 ° C. within a short time. Therefore, if the heat of this oil is used to raise the temperature of the heat storage unit 13, heat storage can be promoted and the heat storage time can be shortened.

Specifically, as shown in FIG. 2, a heat exchange heater 22 is arranged upstream of the heat storage device 13 in the second cooling water passage 3a, and an automatic transmission guided from a heating oil source 23 is provided. Of the oil is heat-exchanged with the cooling water flowing through the second cooling water passage 3a in the heat exchange heater 22 to raise the temperature of the cooling water, and further cooled by the oil cooler 24, and then is supplied to the heating oil source 23. It circulates through the closed passageway that returns.
If the temperature of the cooling water reaches the range of 78 to 90 ° C. during the circulation, the oil switching valve 25 is switched and the oil does not flow into the heat exchange heater 22. As the heating oil source 23 of the heat exchange heater 22, engine oil can be used in addition to the oil of the automatic transmission.

[Embodiment 3] In the engine heat storage device 1C shown in FIG. 3, the cooling water flowing through the second cooling water passage 3 in which the heat storage device 13 is provided is given heat from the heat storage device 13 to form a cylinder. In the process of being introduced into the head 5, the fuel system delivery pipe 19 is warmed up as well as the intake manifold 14 is warmed up.

In order to transfer the heat released from the heat accumulator 13 to the fuel delivery pipe 19 through the cooling water, a water jacket is provided on the fuel delivery pipe 19 as will be described later, and a water jacket is provided in the water jacket. The second cooling water passage shown in FIG. 3 and the second cooling water passage shown in the second embodiment are used as the second cooling water passage. It is applicable to various second cooling water passages including 3a.

In the engine heat storage device 1C having such a configuration, the fuel delivery pipe 19 is also warmed up and the temperature of the fuel rises, so atomization of the fuel at the time of fuel injection is promoted, and the emission is reduced. Performance is greatly improved.

Fourth Embodiment In the engine heat storage device 1D shown in FIG. 4, the upstream end of the second cooling water passage 3b is connected to the first water pump 7a in the first cooling water passage 2b.

In the second cooling water passage 3b, a flow path opening / closing valve 11a and a heat storage device 13 are arranged in this order from the upstream side, and heat is applied from the heat storage device 13 by opening the flow path opening / closing valve 11a. The cooling water can be introduced into the cylinder head 5.

With this configuration, when the engine is cold, the flow passage opening / closing valve 11a is opened to connect the flow passage from the water pump 7a to the second cooling water passage 3b so that heat is applied from the heat accumulator 13. The cooled cooling water is introduced into the cylinder head 5, while the engine is warm, the flow passage opening / closing valve 1
By closing 1a, the flow path from the water pump 7a to the cylinder block 6 is closed, and a normal cooling water passage is formed.

In the fourth embodiment, the passage opening / closing valve 11
Although the upstream end of the second cooling water passage 3b provided with a is directly connected to the water pump 7a, instead of this, a passage switching valve is provided on the discharge side of the water pump 7a, and the passage switching valve By switching, the upstream end of the second cooling water passage 3b can be connected to the water pump 7a when the engine is cold.

The water pump 7a used in the fourth embodiment is also similar to the second water pump 12 in the same manner.
Since it is necessary to operate the cylinder head 5 to warm it up before starting the engine, it is preferable to use, for example, an electromagnetic type instead of a transmission drive of the engine output.

Also in the fourth embodiment, as in the second embodiment, the engine cooling water flowing through the second cooling water passage 3b passes through the intake manifold and the fuel delivery pipe, so that the cylinder head 5 It is possible to warm up each of the above parts together with warming up.

In the heat storage devices 1A to 1D for the engine, the cooling water sent from the engine 4 is supplied to the engine 4
Second cooling water passages 3, 3a introduced into the cylinder head 5 of
However, specific examples of when the vehicle is actually equipped are illustrated in FIGS.

For example, since the upstream end of the first cooling water passage in the engine heat storage device 1A or the cooling water passage of the conventional engine is connected to the cylinder head 5, the cylinder head 5 has a structure as shown in FIG. The cooling water outlet 5a is provided in advance. Further, the second cooling water passages 3, 3a provided with the heat accumulator 13 are connected at their downstream ends to the cylinder head 5, so that the heated cooling water can be introduced into the cylinder head 5. 5, the cooling water inlet 5 is provided on the side opposite to the cooling water outlet 5a.
b is provided.

In FIG. 5, a water pump 12 and a heat accumulator 13 are provided in the second cooling water passages 3 and 3a, and are connected to the cooling water introduction port 5b of the cylinder head 5 via the intake manifold 14. It has become. The on-off valves are not shown.

In addition, the intake manifold 1 is supplied by the heated cooling water flowing through the second cooling water passages 3 and 3a.
In order to warm up the engine 4, the warming passage 14a is provided in contact with the outer surface of the outer wall of the intake manifold 14, as shown in FIGS. The warm-up passage 14a is interposed in the middle of the second cooling water passages 3 and 3a and connected in series, or a side passage is provided in the second cooling water passages 3 and 3a.
By interposing in the middle of the side passages and connecting them in parallel, it is possible to circulate the heated cooling water in the warm-up passage 14a, whereby the intake manifold 14
Can be warmed up.

As shown in FIGS. 8 and 9, the water jacket for warming up the fuel delivery pipe 19 is preferably provided at the portion where the fuel delivery pipe 19 is connected to the injector. The second cooling water passages 3 and 3a are connected to the water jacket 19a in series or in parallel via the side passages so that the heated cooling water can flow to warm up the fuel delivery pipe 19. Is done.

[Embodiment 5] In the engine heat storage apparatus 1E shown in FIG. 10, the first cooling water passage 2c has its upstream end connected to the cylinder head 5 of the engine 4 and its downstream end connected to the cylinder block 6.
In addition, the first flow path switching valve 31, the second flow path switching valve 33, and the first water pump 7 are sequentially arranged from the upstream side.
The cylinder block 6 is also connected to the first flow path switching valve 31 through the communication passage 32. Second cooling water passage 3
The upper end of c is connected to the cylinder block 6 via the first flow path switching valve 31, and the heat storage unit 34, the second water pump 35 that is an electromagnetic pump, and the indoor heater 3 are connected from the upstream side.
6 and the third flow path switching valve 37 are arranged in this order, and the downstream end is connected to the cylinder head 5. Further, the third flow path switching valve 37 is connected to the second flow path switching valve 33 through the passage 38. The second cooling water passage 3c on the upstream side of the heat storage device 34
Is provided with a first temperature sensor 39 for detecting the temperature associated with the cylinder head 5, and the cylinder block 6 is provided with a second temperature sensor 40. The first to third flow path switching valves 31, 33, 37 are operated by sensing the temperature of the thermostat.

With the above arrangement, when the engine is cold and the temperatures detected by the first and second temperature sensors 39 and 40 are both below a predetermined temperature, that is, the cylinder head 5 and the cylinder block 6. In mode 1 in which the temperature of the cylinder head 5 or the cylinder block 6 is equal to or higher than a predetermined temperature immediately after the engine is started, as shown in FIG. The second cooling water passage 3c is formed by the passage switching valves 31 and 33.
While blocking the communication of the first cooling water passage 2c,
Cooling water is supplied by the second water pump 35. Therefore, the cooling water does not circulate in the cylinder block 6. As a result, the heat of the heat accumulator 34 can be concentrated on the warming up of the cylinder head 5, and the cylinder head 5 can be warmed up early. Further, by stopping the flow of the cooling water in the cylinder block 6, the cylinder block 6 can be warmed up early.

Then, when it is cold, the first and second
In the mode 2 in which at least one of the temperatures detected by the temperature sensors 39 and 40 exceeds the predetermined temperature (after either the cylinder head 5 or the cylinder block 6 has reached the predetermined temperature or more, the cylinder head 5 or the cylinder block 6). (Both of which are equal to or higher than a predetermined temperature), as shown in FIG. 12, the first and second flow path switching valves 31 and 33 communicate the second cooling water passage 3c and the communication passage 32.
The cylinder block 6 is communicated with the second cooling water passage 3c via the, and the cooling water is supplied by the second water pump 35. As a result, warm-up of the cylinder head 5 and the cylinder block 6 is promoted. Also, the cylinder block 6
The cooling water does not directly enter the cylinder head 5, and the thermal shock of the cylinder head 5 is reduced.

Then, when it is cold, both temperature sensors 3
In the case of mode 3 in which the temperatures detected by 9 and 40 are equal to or higher than the predetermined temperature (after both the cylinder head 5 and the cylinder block 6 have reached the predetermined temperature or higher and until the warm-up is completed), the state shown in FIG. As described above, while the first cooling water passage 2c communicates, the third flow passage switching valve 37 blocks the communication of the second cooling water passage 3c to communicate the passage 38, and the second water pump 35 is stopped to stop the first cooling water passage 35c. When the cooling water is supplied by the water pump 7, the heat accumulator 34 is always in a high temperature state, and in the warm mode 4 (after completion of warming up), as shown in FIG. The communication of the passage 2c is cut off, and a normal cooling water passage is formed which is circulated from the cylinder block 6 through the cylinder head 5 to the radiator 10.

Next, an example of control for determining the mode will be described with reference to FIG.

First, when starting, the second water pump 35 is turned on (step S1), and the temperature sensor 39,
40 by cylinder head 5 and cylinder block 6
The temperatures T1 and T2 associated with the are read (step S2
).

Then, it is judged whether or not the temperature T1 associated with the cylinder head is higher than the set temperature TSH (step S3). If not, then the temperature T2 associated with the cylinder block is set lower than the set temperature TSB. It is determined whether or not it is high (step S4). Mode 1 if not higher
(Step S5) On the other hand, if it is higher, the mode is set to mode 2 (step S6) and the process returns.

On the other hand, the temperature T related to the cylinder head 5
If 1 is higher than the set temperature TSH, cylinder block 6
It is determined whether or not the temperature T2 associated with the temperature is higher than the set temperature TSB (step S7).

If it is not higher, the mode 2 is set (step S6), and the routine returns, while if it is higher, it is judged whether or not the temperature T1 associated with the cylinder head 5 is higher than the set temperature TS (step S8). If it is not higher, it means that it is in the cold state, and therefore the mode 3 is set (step S9).

[Embodiment 6] In the engine heat storage device 1F shown in FIG. 16, the upstream end of the first cooling water passage 2d is connected to the cylinder head 5, and the downstream end thereof is connected to the cylinder block via the thermostat 9 and the first water pump 7. Connected to 6. An upstream end of the second cooling water passage 3d is connected to the first cooling water passage 2d, a downstream end of the second cooling water passage 3d is connected to the cylinder head 5, and the flow passage opening / closing valve 11, the heat storage device 12, and the second water pump 13 are sequentially arranged from the upstream side. It is arranged. In addition, the first cooling water passage 2d and the second cooling water passage 3d
The connection portion with the upstream end of is connected to the upstream side of the water pump 7 via a communication passage 42 in which the indoor heater 8 is provided. Then, temperature sensors 43 and 44 are arranged upstream and downstream of the heat storage device 12, and it is possible to judge whether heat storage of the heat storage device 12 is completed or not based on the cooling water temperature detected by the temperature sensors 43 and 44. ing.

With the above construction, in the case of the mode 5 from immediately after the engine is started to when the heat storage of the heat storage device 12 is completed (that is, in the cold state where the heat storage is not completed), as shown in FIG. The second by the engine start or the corresponding signal.
The water pump 13 is turned on and the flow path opening / closing valve 11 is opened. As a result, the heat of the heat accumulator 12 is intensively applied to the cylinder head 5.

Then, in the case of mode 6 after the heat storage is completed and until the warm state (flow path switching valve 9 is open) (that is, in the cold state and the heat storage completed state), as shown in FIG. The second water pump 13 is turned off and the flow path opening / closing valve 11 is also closed. As a result, the second cooling water passage 3
Cooling water does not flow into d, and the high temperature state of the heat storage device 12 is maintained.

Further, in the mode 7 in which the heat storage is not completed even when the engine is in the warm state, the second water pump 13 is turned on and the passage opening / closing valve 1 is turned on as shown in FIG.
When 1 is opened, the cooling water is allowed to flow through the second cooling water passage 3d to surely complete the heat storage.

Further, in the case of the mode 8 in which the heat storage is completed and is in the warm state, as shown in FIG. 20, the second water pump 13 is turned off, the flow passage opening / closing valve 11 is closed, and the cylinder block 6 is closed. A normal cooling water passage is formed which circulates from the cylinder head 5 to the radiator 10 through the cylinder head 5.

Next, an example of control for determining the mode will be described with reference to FIG.

First, when starting, the second water pump 13 is turned on (step S11), and the temperatures T1 and T2 associated with the cylinder head and the cylinder block are read by the temperature sensor (step S12).

Then, it is judged whether or not the temperature T1 associated with the cylinder head is higher than the set temperature TS (step S13), and if it is higher, the second water pump 13 is maintained in the ON state (step S14). , Mode 7
Subsequently, it is determined whether the temperature T1 associated with the cylinder head is lower than the temperature T2 associated with the cylinder block (step S16). If it is higher, the timer is started (step S16), while if it is not higher, the process returns to step S2.

After starting the timer, a predetermined time ts
It is determined whether the time has passed (step S17), and the predetermined time t
If s has elapsed, the second water pump 13 is stopped (step S18) and the mode 8 ends, while if not elapsed, the determination is repeated until the time elapses.

On the other hand, the temperature T related to the cylinder head 5
If 1 is not higher than the set temperature TS, it is determined whether the temperature T1 associated with the cylinder head 5 is higher than the temperature T2 associated with the cylinder block 6 (step S).
19). If it is higher, the second water pump 13 is stopped (step S20) and the mode 6 is set. If it is not higher, the operation of the second water pump 13 is maintained (step S2).
1), as mode 5, the process returns to step S2.

In the sixth embodiment shown in FIG. 16, two temperature sensors are used. However, the temperature sensor can be omitted by using two flow path switching valves that operate by sensing the temperature of the thermostat. In this case, as shown in FIG. 22, the engine heat storage device 1G includes the first cooling water passage 2d.
Is connected to the cylinder head 5 at the upstream end, and is connected to the cylinder block 6 at the downstream end via the first flow path switching valve 9, the water pump 7, and the second flow path switching valve 51. In addition, the upstream end of the second cooling water passage 3d is connected to the first cooling water passage 2d.
In addition, the first cooling water passage 2 whose downstream end is located downstream of the first flow path switching valve 9
d is connected to each of them, and a heat storage device 12 is provided in the middle thereof. Further, the connection portion of the second cooling water passage 3d with the first cooling water passage 2d is connected via the communication passage 42 in which the indoor heater 8 is provided. The first flow path switching valve 9 connects the first cooling water passage 2d to the second water pump 7 up to the set temperature T1, but when the set temperature T1 is exceeded, the first cooling water passage 2d is closed and the radiator is closed. The cooling water from 10 is supplied to the second water pump 7. On the other hand, the second flow path switching valve 51 has the set temperature T2.
It is closed until (T1 <T2) so that the cooling water flows only to the cylinder head 5 through the passage 52, and the set temperature T
When it exceeds 2, the cylinder block 6 is opened and cooling water is also supplied to the cylinder block 6.

In the above embodiment, the heat storage unit has a weight of about 12 to 13 kg. On the other hand, in a vehicle, it is known that parts such as a radiator and a spare tire, which are heavy, are attached to the front and rear ends of the vehicle body as much as possible via a suspension device to form a dynamic damper. Therefore, as shown in FIG. 23, the heat accumulator 13 may be disposed at the front end portion of the vehicle in front of the engine 4 via the suspension device 26 so that the function as a dynamic damper can be achieved.

[0075]

As described above, according to the first aspect of the present invention, the cooling water is introduced into the cylinder block and the cylinder head when the engine is cold, separately by the first and second cooling water passages. Since the heat storage device is provided in the second cooling water passage for introducing the cooling water to the cylinder head, the heat released from the heat storage device is concentratedly applied to the cylinder head. Cylinder head can be warmed up intensively and quickly by the generated heat, atomization of fuel is promoted and extinction on the wall of the combustion chamber is eliminated, and emission performance can be remarkably improved. Performance is also improved. Also,
Since the intake system and the fuel supply system adjacent to the cylinder head can be quickly warmed up together with the cylinder head, the emission performance can be further improved.
Furthermore, it becomes possible to shorten the heat storage time in the heat storage unit.

Further, according to the invention of claim 2, the cooling water sent from the cylinder head of the engine is branched from the first cooling water passage provided so as to introduce the cooling water sent from the cylinder head into the cylinder block. By forming the second cooling water passage for introducing water into the cylinder head, the heat released from the heat storage device provided in the second cooling water passage is directly applied to the cylinder head via the cooling water. Therefore, the heat released from the heat accumulator can be concentratedly applied to the cylinder head.

According to the third aspect of the present invention, the flow of the cooling water between the first cooling water passage and the second cooling water passage is blocked when the engine is cold, so that when the engine is cold. The cylinder head can be warmed up efficiently.

Further, the inventions of claims 4 and 5 are
Since the temperature related to the cylinder head and the cylinder block is detected and the flow of the cooling water is controlled based on the detected temperature, not only the cylinder head but also the cylinder block can be efficiently warmed up. In particular, the invention of claim 5 prevents the cooling water of the cylinder block from directly entering the cylinder head, so that the thermal shock of the cylinder head is reduced.

According to the sixth aspect of the invention, when the heat storage is not completed, the flow of the cooling water to the heat storage device is limited, so that the heat storage device does not absorb heat from the cooling water and the warm-up is promoted.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram illustrating a first embodiment.

FIG. 2 is a schematic configuration diagram showing a second embodiment.

FIG. 3 is a schematic configuration diagram showing a third embodiment.

FIG. 4 is a schematic configuration diagram showing a fourth embodiment according to the present invention.

FIG. 5 is a side view of the cylinder head according to the first to fourth embodiments.

FIG. 6 is a plan view of the intake manifold in Examples 1 to 4 above.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a plan view of a fuel delivery pipe according to the third embodiment.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a diagram showing a schematic configuration of a fifth embodiment.

FIG. 11 is an explanatory diagram of an operation.

FIG. 12 is an explanatory diagram of an operation.

FIG. 13 is an explanatory diagram of an operation.

FIG. 14 is an explanatory diagram of an operation.

FIG. 15 is a flowchart showing a control flow.

FIG. 16 is a diagram showing a schematic configuration of a sixth embodiment.

FIG. 17 is an explanatory diagram of an operation.

FIG. 18 is an explanatory diagram of an operation.

FIG. 19 is an explanatory diagram of an operation.

FIG. 20 is an explanatory diagram of an operation.

FIG. 21 is a flowchart showing a control flow.

FIG. 22 is a diagram showing a schematic configuration of a modified example.

FIG. 23 is a schematic side view showing an example in which a heat storage device is used as a dynamic damper.

FIG. 24 is a configuration diagram showing a conventional example.

[Explanation of symbols]

1A-1F engine heat storage device 2,2a-2d First cooling water passage 3,3a-3d Second cooling water passage 4 engine 5 cylinder head 6 cylinder block 7,13 Water pump 9 Flow path switching valve 11 Flow path on-off valve 12 Heat storage 14 Intake manifold 15 open / close valve 16 passages 17 1st flow path on-off valve 18 Second flow path on-off valve 19 Fuel delivery pipe 31,33,37 Flow path switching valve 32 passages 39,40 Temperature sensor

Front page continuation (56) References JP 62-298616 (JP, A) JP 4-269323 (JP, A) Actual opening 61-43926 (JP, U) Actual opening 62-150532 (JP , U) Actual development Sho 63-83419 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F01P 3/20 F01P 7/16

Claims (6)

(57) [Claims] 1. A heat storage device for an engine, wherein a heat storage device is provided in a cooling water passage of an engine having a cylinder head and a cylinder block, wherein the cooling water passage contains at least cooling water supplied by a water pump. A first cooling water passage that is introduced into the cylinder block when warm, and a second cooling water passage that introduces the cooling water supplied by the water pump into the cylinder head independently of the cylinder block at least during engine cold. And a heat storage device for an engine, wherein the heat storage device is provided in the second cooling water passage. 2. An upstream end of the first cooling water passage is connected to the cylinder head, an upstream end of the second cooling water passage is connected to the first cooling water passage, and the second cooling water passage is connected to the second cooling water passage. 2. The heat storage device for an engine according to claim 1, further comprising a flow passage opening / closing valve that opens the cooling water passage when the engine is cold and closes it when the engine is warm. 3. An upstream end of the first cooling water passage is connected to the cylinder block, an upstream end of the second cooling water passage is connected to the cylinder head, and the first cooling water passage is connected to the first cooling water passage. A first flow passage opening / closing valve is provided which opens when the engine is cold and closes when the engine is warm, and opens the second cooling water passage in the second cooling water passage when the engine is cold and closes it when the engine is warm. A second flow passage opening / closing valve is provided to connect the first cooling water passage and the second cooling water passage by a communication passage, and the communication passage is closed when the engine is cold and the engine temperature is high. The heat storage device for an engine according to claim 1, wherein a communication passage opening / closing valve that opens during a period of time is provided. 4. An upstream end of the first cooling water passage is connected to the cylinder head, and an upstream end of the second cooling water passage is connected to the first cooling water passage via a flow path switching valve. First and second temperature sensors are provided for the blocks to detect temperatures associated therewith, and the flow path switching valve is configured so that the temperatures detected by the first and second temperature sensors are both when the engine is cold. The heat storage device for an engine according to claim 1, wherein the second cooling water passage is communicated with the first cooling water passage and the first cooling water passage is disconnected when the temperature is equal to or lower than a predetermined temperature. 5. The flow path switching valve is connected to the cylinder block via a communication path, and the flow path switching valve is at least one of the temperatures detected by the first and second temperature sensors when the engine is cold. 5. The engine heat storage device according to claim 4, wherein when the temperature exceeds a predetermined temperature, the second cooling water passage is communicated with the cylinder block and the cylinder block is communicated with the second cooling water passage through the communication passage. 6. A heat storage device for an engine, wherein a heat storage device is provided in a cooling water passage of an engine having a cylinder head and a cylinder block, wherein the cooling water passage supplies cooling water supplied by a water pump to the cylinder block. A first cooling water passage to be introduced,
A second cooling water passage for introducing the cooling water supplied by the water pump to the cylinder head through the heat accumulator, and a second cooling water passage provided in the second cooling water passage from the second cooling water passage when the engine is cold and the heat accumulation is completed. In addition to introducing cooling water to the head, when the engine is cold and the heat storage is not completed, the second
A heat storage device for an engine, comprising: a flow path opening / closing valve that restricts introduction of cooling water from a cooling water passage to a cylinder head.