JP2005030214A - Internal combustion engine equipped with a heat storage device - Google Patents

Abstract

An object of the present invention is to provide a technique capable of reducing a load of a pressure feeding device that pumps and circulates a heat medium in an internal combustion engine having a heat storage device.
A heat storage container for storing a heat medium in a heat storage state, a circulation circuit for circulating the heat medium via the heat storage container, a pressure feeding device for pumping and circulating the heat medium in the circulation circuit, and opening the circulation circuit Alternatively, in an internal combustion engine equipped with a heat storage device equipped with a circuit opening / closing means that shuts off, when a heat medium is circulated through the circulation circuit (S101, S102), an opening command is issued to the circuit opening / closing means to open the circulation circuit. After that (S103, S107), a circulation execution command is issued to the pumping device so as to pump and circulate the heat medium (S104).
[Selection] Figure 4

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal combustion engine mounted on an automobile or the like, and more particularly to an internal combustion engine including a heat storage device capable of storing a heat medium such as cooling water in a heat storage state.
[0002]
[Prior art]
In an internal combustion engine equipped with a heat storage device capable of storing a heat medium such as cooling water in a heat storage state, the high temperature heat medium is stored in a heat storage container, and the high temperature heat medium is circulated in a circulation circuit passing through the internal combustion engine. The internal combustion engine is warmed up. In such an internal combustion engine, the heat medium circulates through the heat storage container, the internal combustion engine, and the heater core for the vehicle interior heater, and bypasses the heater core for the vehicle interior heater and passes only through the heat storage container and the internal combustion engine. In addition, a technology is known that includes a circulation circuit through which a heat medium circulates and selectively switches between these circulation circuits (see, for example, Patent Document 1).
[0003]
Further, in the internal combustion engine provided with the heat storage device as described above, the heat medium heated by the internal combustion engine is collected in the heat storage container through the circulation circuit during or after the operation of the internal combustion engine.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-4855
[Patent Document 2]
Japanese Patent Laid-Open No. 2002-89668
[0005]
[Problems to be solved by the invention]
An internal combustion engine provided with the above heat storage device includes circuit opening / closing means for opening or closing a circulation circuit that passes through the heat storage container, and a pressure feeding device that pumps and circulates the heat medium in the circulation circuit. And when circulating the heat medium through the heat storage container, such as when the internal combustion engine is warmed up or when the heat medium is recovered in the heat storage container, the circuit opening and closing means opens the circulation circuit, The pumping device is operated to pump and circulate the heat medium.
[0006]
At this time, if the opening of the circulation circuit by the circuit opening / closing means is delayed, the heat medium is pumped by the pumping device while the circulation circuit is shut off. In this case, the circulation of the heat medium is hindered by the circuit opening / closing means, and the load on the pumping device increases. For this reason, there is a possibility that the lifetime of the pressure feeding device is shortened or the failure rate thereof is increased.
[0007]
Therefore, an object of the present invention is to provide a technique capable of reducing the load of a pressure feeding device that pumps and circulates a heat medium in an internal combustion engine including a heat storage device.
[0008]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
That is, according to the present invention, when the heat medium is circulated through the circulation circuit, after the circuit opening / closing means starts to open the circulation circuit, the pressure feeding device is operated.
[0009]
More specifically, an internal combustion engine provided with the heat storage device according to the present invention is:
A heat storage container for storing the heat medium in a heat storage state;
A circulation circuit through which the heat medium circulates via the heat storage container;
A pumping device for pumping and circulating the heat medium in the circulation circuit;
Circuit opening and closing means for opening the circulation circuit when circulating the heat medium by the pressure feeding device, and shutting off the circulation circuit when not circulating the heat medium by the pressure feeding device;
A circulation execution command means for issuing a circulation execution command to the pressure feeding device to circulate the heat medium in the circulation circuit;
Opening command means for issuing an opening command to the circuit opening and closing means to open the circulation circuit, and
When circulating the heat medium in the circulation circuit, the circulation execution command is issued from the circulation execution command means to the pumping device after the opening instruction means is issued to the circuit opening / closing means. It is characterized by.
[0010]
According to the present invention, after the opening of the circulation circuit by the circuit opening / closing means is started, the pumping of the heat medium by the pumping device is started. Therefore, it is possible to prevent the heat medium from being pumped while the circulation circuit is shut off. Therefore, it is possible to reduce the load on the pressure feeding device.
[0011]
In the present invention, it is preferable that the circulation execution command is issued from the circulation execution command means to the pressure feeding device after the circuit opening / closing means has been opened.
[0012]
Although the heat medium is pumped by the pumping device immediately after the pumping device is actuated, it takes time (for example, 5 seconds) to complete the opening of the circulation circuit by the circuit opening / closing means. Therefore, when the heat medium pumping by the pressure feeding device and the circuit opening / closing means are opened simultaneously, the heat medium pumping is performed in a state where the circuit is shut off or before the circuit opening is completed. May be performed. Further, even when the heat medium is pumped by the pressure feeding device after the circuit opening / closing means has been opened, the heat medium is pumped in a state before the circulation circuit is completely opened. There is a fear.
[0013]
According to the control as described above, it is possible to more reliably prevent the heat medium from being pumped by the pumping device in a state where the circulation circuit is shut off. Further, it is possible to prevent the heat medium from being pumped by the pumping device before the circulation circuit is completely opened. Therefore, the load on the pressure feeding device can be further reduced.
[0014]
Further, in the present invention, when the circulation circuit further passes through the internal combustion engine, when the internal combustion engine is stopped, the heat medium heated by the internal combustion engine is collected in the heat storage container, or stored in the heat storage container. When the internal combustion engine is warmed up by a high-temperature heat medium, an opening command may be issued from the opening command means to the circuit opening / closing means.
[0015]
When the heat medium is recovered in the heat storage container with the internal combustion engine stopped, or when the internal combustion engine using the heat medium is warmed up, it is necessary to circulate the heat medium in the circulation circuit by the pressure feeding device.
[0016]
Therefore, as in the above control, an opening command is issued from the opening command means to the circuit opening / closing means, and then the heat medium is circulated through the circulation circuit by the pressure feeding device, thereby reducing the load on the pressure feeding device and supplying the heat storage container to the heat storage container. Heat medium recovery or internal combustion engine warm-up can be performed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of an internal combustion engine including a heat storage device according to the present invention will be described with reference to the drawings.
[0018]
<First Embodiment>
First, a first embodiment of an internal combustion engine provided with a heat storage device according to the present invention will be described. FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine equipped with a heat storage device according to the present embodiment and its cooling water circulation system.
[0019]
The internal combustion engine 1 is a compression ignition internal combustion engine (diesel engine) using light oil as a fuel or a spark ignition internal combustion engine (gasoline engine) using gasoline as a fuel, and is an engine mounted on an automobile.
[0020]
The internal combustion engine 1 is formed with an engine cooling water passage 2 for circulating cooling water as a heat medium according to the present invention. One end of the engine coolant channel 2 is connected to one end of a coolant channel 3 (3a, 3b, 3c, 3d). The other end of the engine cooling water channel 2 is connected to a discharge port of a mechanical water pump 9 that uses a rotational torque of an engine output shaft (crankshaft) of the internal combustion engine 1 as a drive source. The suction port of the mechanical water pump 9 is connected to the other end of the cooling water passage 3.
[0021]
In the middle of the cooling water passage 3, a heater core 6 for heating the passenger compartment is disposed. In the cooling water passage 3, a first bypass water passage 4 a is connected to a portion located between the connection portion with the engine cooling water passage 2 and the heater core 6. The first bypass water channel 4 a is connected to the first cooling water inlet / outlet 5 a of the heat storage container 5.
[0022]
On the other hand, in the cooling water passage 3, a second bypass water passage 4 b is connected to a portion located between the suction port of the mechanical water pump 9 and the heater core 6. The second bypass water channel 4 b is connected to the second cooling water inlet / outlet 5 b of the heat storage container 5. An electric water pump 8 is installed in the middle of the second bypass water channel.
[0023]
The heat storage container 5 is a container for storing cooling water while accumulating the heat of the cooling water. When new cooling water flows in from the first cooling water inlet / outlet 5a or the second cooling water inlet / outlet 5b, this heat storage container 5 is used instead. The cooling water stored in the container 5 is configured to be discharged from the second cooling water inlet / outlet 5b or the first cooling water inlet / outlet 5a.
[0024]
The electric water pump 8 is a water pump that uses the battery 33 as a drive source, and pumps the cooling water toward the second cooling water inlet / outlet 5 b of the heat storage container 5.
[0025]
Here, in the cooling water passage 3, a portion between the connection portion with the first bypass water passage 4 a and the engine cooling water passage 2 is referred to as a first cooling water passage 3 a, and the connection portion with the first bypass water passage 4 a and the heater core 6. The part between the two is called the second cooling water passage 3b. In the cooling water passage 3, a portion between the connection portion with the second bypass water passage 4 b and the heater core 6 is referred to as a third cooling water passage 3 c, and the connection portion with the second bypass water passage 4 b and the mechanical water pump 9. The part between the two is referred to as a fourth cooling water passage 3d.
[0026]
A three-way valve 7 is provided at a connection portion between the third cooling water passage 3c, the fourth cooling water passage 3d, and the second bypass water passage 4b. The three-way valve 7 is configured to block any one of the third cooling water passage 3c, the fourth cooling water passage 3d, and the second bypass water passage 4b or to open all the passages (water passages). . The three-way valve 7 is provided with a position sensor 12 that outputs an electrical signal corresponding to the blocking position (or opening position) by the three-way valve 7.
[0027]
An electric signal corresponding to the temperature of the cooling water flowing in and out of the heat storage container 5 flows in the first bypass water path 4a in the vicinity of the first cooling water inlet / outlet 5a of the heat storage container 5 in the first bypass water path 4a. One water temperature sensor 10 is provided. The engine cooling water channel 2 is provided with a second water temperature sensor 11 that outputs an electrical signal corresponding to the temperature of the cooling water flowing through the engine cooling water channel 2.
[0028]
An electronic control unit (ECU) 20 for controlling the circulation of the cooling water in the cooling water circulation system is provided in the cooling water circulation system configured as described above.
[0029]
In addition to the first water temperature sensor 10, the second water temperature sensor 11, and the position sensor 12 described above, the ECU 20 includes an ignition switch 30 provided in the vehicle interior, a starter switch 31, and a vehicle interior heater switch (heater switch). 32 are electrically connected, and their output signals are input to the ECU 20.
[0030]
Further, the ECU 20 is electrically connected to the battery 33, the electric water pump 8, and the three-way valve 7, and the ECU 20 controls the power supply from the battery 33 to the electric water pump 8 and the three-way valve 7. Then, the ECU 20 switches the cooling water circulation circuit in the cooling water circulation system by controlling these.
[0031]
Next, circulation of the cooling water in the cooling water circulation system according to the present embodiment will be described.
[0032]
First, in the present embodiment, the circulation of cooling water when the internal combustion engine 1 is in operation will be described with reference to FIG. FIG. 2 is a diagram showing a cooling water circulation circuit when the internal combustion engine 1 is operating after the warm-up of the internal combustion engine 1 is completed. The arrow of the dashed-dotted line in FIG. 2 shows the flow of cooling water.
[0033]
When the internal combustion engine 1 is warmed up, the second bypass water passage 4b communicates with the fourth cooling water passage 3d in order to supply the hot water stored in the heat storage container 5 to the internal combustion engine 1. The ECU 20 blocks the second bypass water channel 4b side by the three-way valve 7. Therefore, the cooling water pumped by the mechanical water pump 9 circulates through the engine cooling water passage 2 and the cooling water passage 3 as shown by the one-dot chain arrow in FIG. At this time, the cooling water flows through the heater core 6. Since the cooling water flowing through the engine cooling water channel 2 is heated by the internal combustion engine 1, the temperature rises, and the heater core 6 is heated by the amount of heat.
[0034]
Here, recovery of the cooling water into the heat storage container 5 during the operation of the internal combustion engine 1 will be described. When the internal combustion engine 1 is in operation, the cooling water is heated by the internal combustion engine 1 while circulating through the engine cooling water passage 2 and the cooling water passage 3. Then, when the temperature of the cooling water flowing through the engine cooling water channel 2 detected by the second water temperature sensor 11 becomes equal to or higher than a predetermined temperature, the ECU 20 controls the three-way valve 7 to control the third cooling water passage 3c and the fourth cooling water. The water passage 3d and the second bypass water passage 4b are connected. Therefore, high-temperature cooling water (hereinafter referred to as hot water) flows into the heat storage container 5 from the first cooling water inlet / outlet 5a of the heat storage container 5 through the first bypass water channel 4a. At this time, the low-temperature cooling water stored in the heat storage container 5 when the internal combustion engine 1 is warmed up passes from the second cooling water inlet / outlet 5b of the heat storage container 5 to the fourth cooling water passage 3d via the second bypass water passage 4b. leak. In this way, hot water is collected in the heat storage container 5 during operation of the internal combustion engine 1.
[0035]
However, when the operation of the internal combustion engine 1 is stopped before the temperature of the cooling water flowing in the engine cooling water channel 2 reaches a predetermined temperature, the hot water is not recovered in the heat storage container 5. Therefore, in the present embodiment, when the temperature of the cooling water (hot water) in the engine cooling water channel 2 is higher than the temperature of the cooling water stored in the heat storage container 5 after the operation of the internal combustion engine 1 is stopped, Is recovered in the heat storage container 5.
[0036]
Here, in the present embodiment, the circulation of the cooling water when recovering the hot water in the heat storage container 5 after the operation of the internal combustion engine 1 is stopped will be described with reference to FIG. FIG. 3 is a diagram showing a cooling water circulation circuit when hot water is collected in the heat storage container 5 after the operation of the internal combustion engine 1 is stopped. The arrow of the dashed-dotted line in FIG. 3 shows the flow of cooling water.
[0037]
When recovering hot water in the heat storage container 5 after the operation of the internal combustion engine 1 is stopped, the ECU 20 shuts off the third cooling water passage 3c side by the three-way valve 7 and opens the second bypass water passage 4b side. The 2 bypass water channel 4b and the 4th cooling water channel 3d are connected. Then, the ECU 20 supplies electric power from the battery 33 and operates the electric water pump 8. Therefore, the cooling water is pumped by the electric water pump 8, and as shown by the one-dot chain line arrow in FIG. 3, the second bypass water channel 4b → the heat storage container 5 → the first bypass water channel 4a → the first cooling water channel 3a → the engine cooling. A circulation circuit in which the cooling water circulates in the order of the water channel 2 → the fourth cooling water channel 3 d → the second bypass water channel 4 b is formed. In the present embodiment, this circulation circuit is referred to as a hot water recovery circulation circuit.
[0038]
If such a warm water collection | recovery circulation circuit is formed, the warm water which existed in the engine cooling water channel 2 will flow in into the thermal storage container 5 from the 2nd cooling water entrance / exit 5b of the thermal storage container 5. FIG. Then, the low-temperature cooling water stored in the heat storage container 5 flows out from the first cooling water inlet / outlet 5 a of the heat storage container 5. As a result, hot water is recovered in the heat storage container 5.
[0039]
As described above, when the hot water is recovered in the heat storage container 5 after the operation of the internal combustion engine 1 is stopped, the ECU 20 controls the three-way valve 7 so that the fourth cooling water passage 3d and the second bypass water passage 4b communicate with each other. At the same time, the electric water pump 8 is operated to pump the cooling water. At this time, when the electric power is supplied from the battery 33, the electric water pump 8 immediately starts pumping the cooling water, but it takes time to complete the opening of the second bypass water channel 4b side by the three-way valve 7 (for example, , About 5 seconds). Therefore, when the control of the three-way valve 7 and the operation of the electric water pump 8 are started at the same time, the pumping of the cooling water is performed in a state where the hot water recovery circuit is shut off or before the opening of the hot water recovery circuit is completed. May be performed. In this case, the flow of the cooling water is obstructed by the three-way valve 7 and the load on the electric water pump 8 may be increased. Therefore, in the present embodiment, after the operation of the internal combustion engine 1 is stopped, the hot water recovery control as shown in FIG. 4 is performed when the hot water is recovered in the heat storage container 5.
[0040]
Hereinafter, the hot water recovery control when recovering the hot water in the heat storage container 5 after the operation of the internal combustion engine 1 in the present embodiment will be described with reference to FIG.
FIG. 4 is a flowchart showing a hot water recovery control routine for recovering hot water in the heat storage container 5 after the operation of the internal combustion engine 1 is stopped. This routine is stored in advance in the ECU 20 and is repeated every predetermined time while the power of the ECU 20 is ON.
[0041]
In this routine, first, in S101, the ECU 20 determines whether or not the ignition switch 30 is turned off, that is, whether or not the operation of the internal combustion engine 1 is stopped.
[0042]
In S101, when it is determined that the ignition switch 30 is not OFF, that is, the internal combustion engine 1 is in operation, the ECU 20 ends the execution of this routine. On the other hand, when it is determined in S101 that the ignition switch 30 is OFF, that is, the operation of the internal combustion engine 1 is stopped, the ECU 20 proceeds to S102.
[0043]
In S102, the ECU 20 determines whether or not a hot water recovery execution condition for executing the hot water recovery into the heat storage container 5 is satisfied. Here, the hot water recovery execution condition is when the temperature of the cooling water in the engine cooling water channel 2 is higher than the temperature of the cooling water stored in the heat storage container 5. The temperature of the cooling water stored in the heat storage container 5 is determined when the warm water is collected into the heat storage container 5 or when the internal combustion engine 1 is warmed up before the routine is executed (internal combustion as described later). It is estimated from the temperature of the cooling water in the first bypass water channel 4a detected by the first water temperature sensor 10 during the warm-up before starting the engine 1).
[0044]
When it is determined in S102 that the hot water recovery execution condition is not satisfied, the ECU 20 ends the execution of this routine. On the other hand, when it is determined in S102 that the hot water recovery execution condition is satisfied, the ECU 20 proceeds to S103.
[0045]
In S103, the ECU 20 determines from the output value of the position sensor 12 whether or not the second bypass water channel 4b side is blocked by the three-way valve 7.
[0046]
In the present embodiment, for example, when the operation of the internal combustion engine 1 is stopped before the hot water recovery into the heat storage container 5 is started during the operation of the internal combustion engine 1, the cooling water circulation system in FIG. Since the circulation circuit as shown by the one-dot chain line arrow is formed, the second bypass water passage 4b side is blocked by the three-way valve 7 during execution of this routine. On the other hand, when the hot water recovery into the heat storage container 5 is started during the operation of the internal combustion engine 1 and the operation of the internal combustion engine 1 is stopped during the operation, the second bypass water passage 4b and the fourth cooling water passage 3d communicate with each other. Therefore, at the time of execution of this routine, the second bypass water channel 4b side is not blocked by the three-way valve 7.
[0047]
If it is determined in S103 that the second bypass water channel 4b side is blocked, the ECU 20 proceeds to S107. On the other hand, if it is determined in S103 that the second bypass water channel 4b side is not blocked, that is, the second bypass water channel 4b and the fourth cooling water channel 3d are in communication, the ECU 20 proceeds to S104.
[0048]
In S107, the ECU 20 opens the second bypass water passage 4b side with respect to the three-way valve 7, and communicates with the second bypass water passage 4b and the fourth cooling water passage 3d (corresponding to the opening instruction according to the present invention). ). When this communication command is issued, the three-way valve 7 starts to open on the second bypass water channel 4b side.
[0049]
Next, the ECU 20 proceeds to S108, whether or not the opening of the second bypass water passage 4b side by the three-way valve 7 is completed, that is, whether the communication between the second bypass water passage 4b and the fourth cooling water passage 3d is completed. Determine whether or not.
[0050]
If it is determined in S108 that the communication between the second bypass water passage 4b and the fourth cooling water passage 3d is not completed, the ECU 20 repeats S108. On the other hand, when it is determined in S108 that the communication between the second bypass water passage 4b and the fourth cooling water passage 3d is completed, the ECU 20 proceeds to S104.
[0051]
In S104, the ECU 20 issues an operation start command (corresponding to a circulation execution command according to the present invention) to the electric water pump 8, and starts pumping and circulating cooling water by the electric water pump 8.
[0052]
Next, the ECU 20 proceeds to S105, and determines whether or not a hot water recovery end condition for ending the hot water recovery into the heat storage container 5 is satisfied. Here, examples of the hot water recovery end condition include a case where the temperature of the hot water recovered in the heat storage container 5 has reached a predetermined recovery end temperature. At this time, the temperature of the hot water collected in the heat storage container 5 is estimated from the temperature of the cooling water in the first bypass water channel 4 a detected by the first water temperature sensor 10. Further, the hot water recovery end temperature here is determined by the temperature of the hot water in the engine cooling water channel 2 and the temperature of the cooling water stored in the heat storage container 5 before executing the hot water recovery into the heat storage container 5. It is done.
[0053]
If it is determined in S105 that the hot water recovery end condition is not satisfied, the ECU 20 repeats S105. On the other hand, if it is determined in S105 that the hot water recovery end condition is satisfied, the ECU 20 proceeds to S106.
[0054]
The ECU 20 having proceeded to S106 stops the operation of the electric water pump 8 and ends the execution of this routine.
[0055]
According to the hot water recovery control described above, after the communication between the second bypass water passage 4b and the fourth cooling water passage 3d is completed, that is, after the opening of the hot water recovery circulation circuit is completed, the operation of the electric water pump 8 is performed. Is started and cooling water is pumped. Therefore, the operation of the electric water pump 8 can be prevented from being started in a state where the hot water recovery circulation circuit is shut off or before the opening of the hot water recovery circulation circuit is completed. Therefore, the load on the electric water pump 8 can be reduced.
[0056]
In the hot water recovery control routine, the ECU 20 issues an operation start command to the electric water pump 8 after the communication between the second bypass water passage 4b and the fourth cooling water passage 3d is completed. However, after issuing a communication command to communicate the second bypass water channel 4b and the fourth cooling water channel 3d, the ECU 20 issues an operation start command to the electric water pump 8 before the communication is completed. Anyway.
[0057]
Even in this case, since the operation of the electric water pump 8 can be prevented from being started in a state where the hot water recovery circulation circuit is interrupted, the second bypass water passage 4b and the fourth cooling to the three-way valve 7 are prevented. The load on the electric water pump 8 can be reduced as compared with the case where the communication command with the water passage 3d and the operation start command to the electric water pump 8 are issued simultaneously.
[0058]
<Second Embodiment>
Next, a second embodiment of the internal combustion engine provided with the heat storage device according to the present invention will be described. The schematic configuration of the internal combustion engine provided with the heat storage device according to the present embodiment and its cooling water circulation system is the above-described internal combustion engine provided with the heat storage device according to the first embodiment shown in FIG. This is the same as the schematic configuration of the system.
[0059]
In the present embodiment, the circulation of the cooling water when warming up the internal combustion engine 1 before the internal combustion engine 1 is started when cold will be described with reference to FIG. That is, the cooling water circulation circuit when warming up the internal combustion engine 1 before the internal combustion engine 1 is started in the cold state is the same as the hot water recovery circulation circuit described in the first embodiment. .
[0060]
When the internal combustion engine 1 is warmed up before the internal combustion engine 1 is started when it is cold, the ECU 20 controls the three-way valve 7 and the electric water pump 8, as shown by the one-dot chain arrow in FIG. 3. A circulation circuit through which the cooling water circulates is formed. In the present embodiment, this circulation circuit is referred to as a warm-up circulation circuit.
[0061]
When such a warm-up circulation circuit is formed before the internal combustion engine 1 is started, the warm water collected and stored in the heat storage container 5 during the operation or after the operation stop of the internal combustion engine 1 is stored in the first heat storage container 5. It flows out from the cooling water inlet / outlet 5a. The internal combustion engine 1 is heated and warmed up by this hot water.
[0062]
In the present embodiment, when the internal combustion engine 1 is warmed up before the internal combustion engine 1 is started when it is cold, as in the hot water recovery after the operation of the internal combustion engine 1 is stopped in the first embodiment described above. The ECU 20 controls the three-way valve 7 to cause the fourth cooling water passage 3d and the second bypass water passage 4b to communicate with each other, and operates the electric water pump 8 to pump the cooling water. Therefore, when the control of the three-way valve 7 and the operation of the electric water pump 8 are started at the same time, the flow of the cooling water is hindered by the three-way valve 7 and the load on the electric water pump 8 may increase. . Therefore, in the present embodiment, when the internal combustion engine 1 is warmed up before the internal combustion engine 1 is started when it is cold, warm-up control as shown in FIG. 5 is performed.
[0063]
Hereinafter, warm-up control when warming up the internal combustion engine 1 before the internal combustion engine 1 is started when cold will be described with reference to FIG.
FIG. 5 is a flowchart showing a warm-up control routine for warming up the internal combustion engine 1 before the internal combustion engine 1 is started when it is cold. This routine is stored in advance in the ECU 20 and is repeated every predetermined time while the power of the ECU 20 is ON. In this routine, S103 to S104 and S106 to S108 are the same as the warm water recovery control routine shown in FIG.
[0064]
In this routine, the ECU 20 first determines in step S201 whether or not the ignition switch 30 has been turned on. Here, in S201, it is only necessary to determine whether or not the internal combustion engine 1 is before starting. Therefore, in addition to the ignition switch 30, it is determined whether or not a door switch is turned on, or a seating sensor in the seat. It may be determined whether or not has transmitted an ON signal.
[0065]
If it is determined in S201 that the ignition switch 30 is not ON, the ECU 20 ends the execution of this routine. On the other hand, if it is determined in S201 that the ignition switch 30 is ON, the ECU 20 proceeds to S202.
[0066]
In S202, the ECU 20 determines whether or not a warm-up execution condition for executing the warm-up of the internal combustion engine 1 is satisfied. As a warm-up execution condition, the case where the temperature of the cooling water in the engine cooling water channel 2 detected by the 2nd water temperature sensor 1 is below predetermined warm-up execution temperature can be illustrated.
[0067]
When it is determined in S202 that the warm-up execution condition is not satisfied, the ECU 20 ends the execution of this routine. On the other hand, when it is determined in S202 that the warm-up execution condition is satisfied, the ECU 20 proceeds to S103.
[0068]
In S103, the ECU 20 determines from the output value of the position sensor 12 whether or not the second bypass water channel 4b side is blocked by the three-way valve 7.
[0069]
In the present embodiment, for example, after the recovery of hot water into the heat storage container 5 is completed during the operation of the internal combustion engine 1 and a circulation circuit as shown by the dashed-dotted arrow in FIG. When the operation is stopped, a circulation circuit as shown by the one-dot chain line arrow in FIG. 2 described above is formed, and therefore, when the routine is executed, the second bypass water channel 4b side is blocked by the three-way valve 7. It is in a state. On the other hand, when the above-described hot water recovery into the heat storage container 5 after the operation of the internal combustion engine 1 is stopped and then the operation of the internal combustion engine 1 is stopped, the second bypass water passage 4b and the fourth cooling water passage Therefore, when this routine is executed, the second bypass water channel 4b side is not blocked by the three-way valve 7.
[0070]
In S205, it is determined whether or not a warm-up execution end condition for ending warm-up before the cold start of the internal combustion engine 1 is satisfied. Here, examples of the warm-up end condition include a case where the temperature of the hot water collected in the heat storage container 5 has reached a predetermined warm-up end temperature. The warming-up end temperature here is determined by the temperature of the cooling water in the engine cooling water channel 2 and the temperature of the hot water stored in the heat storage container 5 before executing the warming up before starting the internal combustion engine 1. .
[0071]
If it is determined in S205 that the warm-up termination condition is satisfied, the ECU 20 proceeds to S106, stops the operation of the electric water pump 8, and ends the execution of this routine.
[0072]
According to the warm-up control described above, after the communication between the second bypass water passage 4b and the fourth cooling water passage 3d is completed, that is, after the opening of the warm-up circulation circuit is completed, the operation of the electric water pump 8 is performed. Is started and cooling water is pumped. Therefore, it is possible to prevent the operation of the electric water pump 8 from being started in a state where the warm-up circulation circuit is interrupted or before the opening of the warm-up circulation circuit is completed. Therefore, the load on the electric water pump 8 can be reduced.
[0073]
Also in the warm-up control routine, similar to the warm water recovery routine in the first embodiment described above, after a communication command is issued so as to connect the second bypass water passage 4b and the fourth cooling water passage 3d. For example, the ECU 20 may issue an operation start command to the electric water pump 8 before the communication is completed.
[0074]
Even in this case, since the operation of the electric water pump 8 can be prevented from being started in a state where the warm-up circulation circuit is interrupted, the second bypass water channel 4b and the fourth cooling to the three-way valve 7 are prevented. The load on the electric water pump 8 can be reduced as compared with the case where the communication command with the water passage 3d and the operation start command to the electric water pump 8 are issued simultaneously.
[0075]
Note that the hot water recovery circuit or the warm-up circuit in the first embodiment or the second embodiment described above corresponds to the circuit according to the present invention. The pumping device according to the present invention includes an electric water pump 8, and the circuit opening / closing means according to the present invention includes a three-way valve 7. Further, the circulation execution command means and the opening execution command means according to the present invention are constituted by the ECU 20.
[0076]
【The invention's effect】
According to the internal combustion engine including the heat storage device according to the present invention, it is possible to reduce the load of the pressure feeding device that pumps and circulates the heat medium. Therefore, it is possible to prevent the life of the pumping device from being shortened and to reduce the failure rate.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine equipped with a heat storage device according to the present invention and its cooling water circulation system.
FIG. 2 is a diagram showing a cooling water circulation circuit when the internal combustion engine is in operation after the completion of warm-up of the internal combustion engine.
FIG. 3 is a diagram showing a warm water recovery circuit according to the first embodiment or a warm-up circuit according to the second embodiment.
FIG. 4 is a flowchart showing a hot water recovery control routine for recovering hot water in the heat storage container after the operation of the internal combustion engine is stopped.
FIG. 5 is a flowchart showing a warm-up control routine for warming up the internal combustion engine before the internal combustion engine is started when it is cold.
[Explanation of symbols]
1 ... Internal combustion engine
2 ... Engine cooling water channel
3 ... Cooling water passage
3a .. First cooling water passage
3b .. Second cooling water passage
3c ··· Third cooling water passage
3d · · · 4th cooling water passage
4a ··· 1st bypass channel
4b ... Second bypass channel
5 ... Thermal storage container
5a ··· First cooling water inlet / outlet
5b ··· Second cooling water inlet / outlet
6. Heater core
7 ... Three-way valve
8 ... Electric water pump
9 ... Mechanical water pump
10. ・ First water temperature sensor
11. Second water temperature sensor
20. ・ ECU
30 ・ ・ Ignition switch
31. Starter switch
32. Heater switch
33. Battery

Claims (4)

A heat storage container for storing the heat medium in a heat storage state;
A circulation circuit through which the heat medium circulates via the heat storage container;
A pumping device for pumping and circulating the heat medium in the circulation circuit;
Circuit opening and closing means for opening the circulation circuit when circulating the heat medium by the pressure feeding device, and shutting off the circulation circuit when not circulating the heat medium by the pressure feeding device;
A circulation execution command means for issuing a circulation execution command to the pressure feeding device to circulate the heat medium in the circulation circuit;
Opening command means for issuing an opening command to the circuit opening and closing means to open the circulation circuit, and
When circulating the heat medium in the circulation circuit, the circulation execution command is issued from the circulation execution command means to the pumping device after the opening instruction means is issued to the circuit opening / closing means. An internal combustion engine provided with a heat storage device characterized by the above. 2. The internal combustion engine having a heat storage device according to claim 1, wherein after the opening of the circulation circuit by the circuit opening / closing means is completed, the circulation execution command is issued from the circulation execution command means to the pressure feeding device. The circulation circuit further passes through the internal combustion engine, and when the internal combustion engine is stopped, when the heat medium heated by the internal combustion engine is circulated through the circulation circuit and collected in the heat storage container, The internal combustion engine having a heat storage device according to claim 1 or 2, wherein the opening instruction is issued from the opening instruction means to the circuit opening / closing means. The circulation circuit further passes through the internal combustion engine, and when the internal combustion engine is stopped, the high-temperature heat medium stored in the heat storage container is circulated through the circulation circuit to warm up the internal combustion engine. The internal combustion engine provided with the heat storage device according to claim 1 or 2, wherein the opening command is issued from the opening command means to the circuit opening / closing means.

Images