JP2004092491A - Internal combustion engine with heat storage device - Google Patents

Abstract

The present invention provides a technique for reliably warming up an internal combustion engine provided with a heat storage device before or at the time of starting the internal combustion engine without deteriorating the warm-up efficiency. As an issue.
The present invention relates to a heat storage container for storing a heat medium in a heat storage state, a first circulation circuit for circulating the heat medium via an internal combustion engine, and a heat medium via a device other than the internal combustion engine. In the internal combustion engine having the second circulation circuit in which the internal combustion engine circulates and the warm-up execution command means 39 for issuing a warm-up execution command for the internal combustion engine, the circulation The circuit switching means 16 switches the heat medium circulation circuit to the first circulation circuit.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an internal combustion engine mounted on an automobile or the like, and particularly to an internal combustion engine provided with a heat storage device capable of storing a heat medium such as cooling water in a heat storage state.
[0002]
[Prior art]
2. Description of the Related Art In recent years, an internal combustion engine equipped with a heat storage device has been proposed for an internal combustion engine mounted on an automobile or the like for the purpose of improving cold startability, combustion stability, exhaust emission, indoor heating performance, and the like.
[0003]
As an internal combustion engine provided with such a heat storage device, for example, there is an internal combustion engine as described in JP-A-2002-4855. An internal combustion engine provided with a heat storage device described in this publication includes an internal combustion engine body that is cooled or heated by circulation of a heat medium, and a heater core that performs heat exchange between the heat medium and air for heating a vehicle interior. A heat medium circulation circuit that circulates a heat medium via the internal combustion engine body and the heater core, a bypass passage connected to the heat medium circulation circuit so as to bypass the heater core, and a heat passage provided in the bypass passage. A heat storage container for storing the heat of the medium, and a pump mechanism provided in the bypass passage for pumping the heat medium in the bypass passage are provided.
[0004]
In the internal combustion engine provided with the heat storage device as described above, the heat storage container and the pump mechanism are located in parallel with the heater core in the flow direction of the heat medium, so that the internal combustion engine, the heater core, the heat storage container, and the pump mechanism are connected to each other. It is possible to selectively establish a circulation circuit that passes only through the internal combustion engine, the heat storage container, and the pump mechanism, and a circulation circuit that passes only through the internal combustion engine and the heater core.
[0005]
Therefore, the high-temperature heat medium is circulated through a desired circulation circuit, and the amount of heat of the heat medium is selectively transmitted to the internal combustion engine or the heater core, thereby improving the efficiency of preheating the internal combustion engine and improving the performance for heating the passenger compartment. Can be realized.
[0006]
Further, as an internal combustion engine provided with the above-described heat storage device, for example, there is a warm-up control device described in JP-A-2002-89668. The warm-up control device disclosed in this publication includes a heat storage tank in a cooling water system of the internal combustion engine, stores high-temperature cooling water in the heat storage tank while keeping it warm, and stores the cooling water stored in the heat storage tank with the internal combustion engine. In a warm-up control device that performs warm-up by supplying the cooling water to the transmission, the ratio of the amount of cooling water supplied from the heat storage tank to the internal combustion engine and the transmission is determined according to the temperature of the internal combustion engine and the transmission. It is configured to be set.
[0007]
In the warm-up control device as described above, the above-described configuration makes it possible to perform an appropriate warm-up operation for the internal combustion engine and the transmission in accordance with the respective temperature conditions. Can be prevented from deteriorating.
[0008]
[Problems to be solved by the invention]
The internal combustion engine provided with the heat storage device as described above passes through a first circulation circuit through which the heat medium circulates via the internal combustion engine, and a device other than the internal combustion engine such as a heater core and a transmission for heating the vehicle compartment. A second circulation circuit through which the heat medium circulates, and switches the heat medium circulation circuit according to the state of the internal combustion engine or a device other than the internal combustion engine (for example, temperature).
[0009]
Here, conventionally, when warming up the internal combustion engine at or before the start of the internal combustion engine, for example, a warm-up execution instruction of the internal combustion engine is issued from a warm-up execution instruction means such as an ECU mounted on the vehicle. The circulation circuit of the heat medium is switched by circulation circuit switching means such as a flow path switching valve so that the high-temperature heat medium discharged and supplied from the heat storage container circulates in the first circulation circuit. Then, the high-temperature heat medium circulates through the first circulation circuit, whereby the heat of the heat medium is transmitted to the internal combustion engine, and the internal combustion engine is warmed up.
[0010]
However, in the internal combustion engine equipped with the conventional heat storage device, when the internal combustion engine is warmed up, after the internal combustion engine is warmed up from a warming up execution command unit such as an ECU, the flow path is increased. It takes time (for example, about 5 seconds) before the circulation circuit of the heat medium is actually switched to the first circulation circuit by the circulation circuit switching means such as the switching valve. Therefore, after a warm-up execution command such as an ECU issues a warm-up execution command for the internal combustion engine and the supply of a high-temperature heat medium from the heat storage container is started, the circulation circuit for the heat medium is completely switched to the first circuit. Until switching to the circulation circuit, the high-temperature heat medium supplied from the heat storage container also flows to the second circulation circuit.
[0011]
Therefore, a high-temperature heat medium is also supplied to devices other than the internal combustion engine, so that the warm-up efficiency of the internal combustion engine deteriorates.
[0012]
Further, after the warm-up execution command means issues a warm-up execution command for the internal combustion engine, the supply of the high-temperature heat medium from the heat storage container is started after the heat medium circulation circuit is completely switched to the first circulation circuit. In such a case, the time until the heat medium is actually supplied to the internal combustion engine becomes longer.
[0013]
Accordingly, the time required for the internal combustion engine to be warmed up becomes longer, so that the warming efficiency of the internal combustion engine also deteriorates.
[0014]
Further, in an internal combustion engine equipped with a heat storage device as described above, after the internal combustion engine has been warmed up, it is necessary to supply a high-temperature heat medium to devices other than the internal combustion engine, such as a vehicle interior heater core and a transmission. Supplies a high-temperature heat medium supplied from the heat storage container to a device other than the internal combustion engine by switching a heat medium circulation circuit to a second circulation circuit in which the heat medium circulates via the device other than the internal combustion engine. . Furthermore, after supplying the high-temperature heat medium to the device other than the internal combustion engine, the internal combustion engine is stopped before a new high-temperature heat medium is recovered in the heat storage container, and then before restarting the internal combustion engine or When the internal combustion engine is warmed up when the internal combustion engine is restarted, the internal combustion engine is supplied by supplying a high-temperature heat medium to a device other than the internal combustion engine and then supplying the high-temperature heat medium remaining in the heat storage container to the internal combustion engine. The engine will be warmed up.
[0015]
Therefore, if an excessive amount of heat medium is supplied when supplying a high-temperature heat medium stored in the heat storage container to a device other than the internal combustion engine, warming up of the internal combustion engine before or during restart of the internal combustion engine is performed. Insufficient heat medium is required to perform the heat treatment sufficiently. As a result, it becomes impossible to reliably warm up the internal combustion engine.
[0016]
The present invention has been made in view of the above circumstances, and in an internal combustion engine equipped with a heat storage device, before or at the time of starting the internal combustion engine, it is possible to reliably warm up the internal combustion engine without deteriorating the warm-up efficiency. It is an object of the present invention to provide a technology capable of performing a machine.
[0017]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
That is, the internal combustion engine provided with the heat storage device according to the present invention,
A heat storage container for storing a heat medium in a heat storage state,
A first circulation circuit through which the heat medium circulates via an internal combustion engine;
A second circulation circuit in which the heat medium circulates via a device other than the internal combustion engine,
Warm-up execution means for executing warm-up of the internal combustion engine before or at the time of starting of the internal combustion engine by the high-temperature heat medium stored in the heat storage container,
Warm-up execution command means for issuing an internal-combustion engine warm-up execution command to the warm-up execution means to execute warm-up of the internal combustion engine;
Circulating circuit switching means for switching between the first circulating circuit and the second circulating circuit,
Before the warm-up execution command unit issues the internal-combustion engine warm-up execution command to the warm-up execution unit, the first circulation circuit switching unit switches the heat medium circulation circuit to the first circulation circuit by the circulation circuit switching unit. Control was performed.
[0018]
According to this configuration, when warming up the internal combustion engine before or at the time of starting the internal combustion engine, the internal combustion engine is warmed up from the warming-up execution command unit to the warming-up execution unit so that the internal combustion engine is warmed up. Although the command is issued, before the internal combustion engine warm-up execution command is issued from the warm-up execution command means, the circulation circuit of the heat medium has been switched to the first circulation circuit.
[0019]
For this reason, when the warm-up is executed by the warm-up execution means and the supply of the high-temperature heat medium from the heat storage container is started, the circulation circuit of the heat medium has already been switched to the first circulation circuit. Therefore, it is possible to prevent the high-temperature heat medium from flowing into the second circulation circuit.
[0020]
That is, according to the above configuration, when warming up the internal combustion engine before or at the time of starting the internal combustion engine, the high-temperature heat medium is not supplied to devices other than the internal combustion engine. In addition, immediately after the start of warming up the internal combustion engine, a high-temperature heat medium is supplied to the internal combustion engine, so that the warming up of the internal combustion engine is quickly executed. Therefore, the internal combustion engine can be warmed up without deteriorating the warming-up efficiency.
[0021]
Here, in the present invention, the first circulation circuit switching control may be performed when the internal combustion engine is stopped.
[0022]
According to this configuration, when the internal combustion engine is stopped, the heat medium circulation circuit is switched to the first circulation circuit. Therefore, before the next start of the internal combustion engine, the heat medium circulation circuit is already in the first circulation circuit. It has a circulation circuit.
[0023]
Therefore, when warming up the internal combustion engine before or at the time of starting the internal combustion engine, it is possible to prevent a high-temperature heat medium from being supplied to devices other than the internal combustion engine. In addition, immediately after the start of warming up the internal combustion engine, a high-temperature heat medium is supplied to the internal combustion engine, so that the warming up of the internal combustion engine is quickly executed. Therefore, the internal combustion engine can be warmed up without deteriorating the warming-up efficiency.
[0024]
Further, the internal combustion engine provided with the heat storage device according to the present invention,
A heat storage container for storing a heat medium in a heat storage state,
A first circulation circuit through which the heat medium circulates via an internal combustion engine;
A second circulation circuit in which the heat medium circulates via a device other than the internal combustion engine,
Heat medium heat capacity calculating means for calculating the heat capacity of the high temperature heat medium remaining in the heat storage container after circulating the high temperature heat medium stored in the heat storage container through the first circulation circuit and warming up the internal combustion engine. When,
Circulating circuit switching means for switching between the first circulating circuit and the second circulating circuit,
The heat capacity of the high-temperature heat medium remaining in the heat storage container after warming up the internal combustion engine calculated by the heat medium heat capacity calculation means is equal to or more than a predetermined amount, and a high-temperature heat medium is supplied to a device other than the internal combustion engine. When it is necessary to supply the heat medium, the circulation circuit switching means performs the second circulation circuit switching control for switching the circulation circuit to the second circulation circuit.
[0025]
According to this configuration, the heat capacity of the high-temperature heat medium remaining in the heat storage container after warming up the internal combustion engine is equal to or more than a predetermined amount, and it is necessary to supply the high-temperature heat medium to devices other than the internal combustion engine. In some cases, the high-temperature heat medium remaining in the heat storage container is circulated through the second circulation circuit, that is, supplied to a device other than the internal combustion engine.
[0026]
In other words, when the heat capacity of the high-temperature heat medium remaining in the heat storage container is smaller than the predetermined amount, it is possible to prevent the high-temperature heat medium from being supplied to devices other than the internal combustion engine.
[0027]
Here, after the internal combustion engine is once stopped, the predetermined amount is required to warm up the internal combustion engine next time before or at the next restart of the internal combustion engine. The heat capacity may be used.
[0028]
According to this configuration, the predetermined amount is a heat capacity of a high-temperature heat medium required to warm up the internal combustion engine before or when the internal combustion engine is restarted after the internal combustion engine is once stopped. is there. Therefore, when the heat capacity of the high-temperature heat medium remaining in the heat storage container after warming up the internal combustion engine is smaller than a predetermined amount, the heat medium is supplied to a device other than the internal combustion engine, so that the internal combustion engine is restarted. Alternatively, it is possible to prevent a shortage of a heat medium required for warming up the internal combustion engine at the time of restart.
[0029]
In other words, according to the above configuration, even if the internal combustion engine is temporarily stopped before the new high-temperature heat medium is recovered in the heat storage container, the internal combustion engine is restarted next time or when the internal combustion engine is restarted next time. By securing the heat medium necessary for warming up the engine in the heat storage container, the internal combustion engine can be reliably warmed up.
[0030]
The heat capacity of the heat medium required for warming up the internal combustion engine changes according to the temperature of the internal combustion engine before warming up. In other words, if the temperature of the internal combustion engine before warm-up is high, the heat capacity of the heat medium required for warm-up decreases, and if the temperature of the internal combustion engine before warm-up is low, the heat capacity of the heat medium required for warm-up Will increase.
[0031]
Therefore, in the present invention, the heat capacity required for the next engine warm-up may be determined by the temperature of the heat medium in the first circulation circuit.
[0032]
According to this configuration, in order to warm up the internal combustion engine before or at the time of restarting the internal combustion engine after the internal combustion engine is temporarily stopped, based on the temperature of the heat medium in the first circulation circuit that passes through the internal combustion engine. The necessary heat capacity of the heat medium is determined. Therefore, it is possible to prevent a heat medium having an excessively high or low temperature from being secured for warming up the internal combustion engine.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a specific embodiment of an internal combustion engine including a heat storage device according to the present invention will be described with reference to the drawings.
[0034]
<First embodiment>
FIG. 1 is a diagram showing a cooling water circulation system of an internal combustion engine provided with a heat storage device according to the present invention.
[0035]
The internal combustion engine 1 is a compression ignition type internal combustion engine (diesel engine) using light oil as fuel or a spark ignition type internal combustion engine (gasoline engine) using gasoline as fuel, and is an engine mounted on an automobile.
[0036]
The internal combustion engine 1 includes a cylinder head 1a and a cylinder block 1b. In each of the cylinder head 1a and the cylinder block 1b, a head-side cooling water passage 2a and a block-side cooling water passage 2b for flowing cooling water as a heat medium according to the present invention are formed. The block side cooling water passage 2b communicates with each other.
[0037]
A first cooling water passage 4 is connected to the head-side cooling water passage 2 a, and the first cooling water passage 4 is connected to a cooling water inlet of a radiator 5. The cooling water outlet of the radiator 5 is connected to a thermostat valve 7 via a second cooling water passage 6.
[0038]
A third cooling water passage 8 and a bypass water passage 9 are connected to the thermostat valve 7 in addition to the second cooling water passage 6. The third cooling water passage 8 is connected to a suction port of a mechanical water pump 10 driven by rotational torque of an engine output shaft (crankshaft) of the internal combustion engine 1, and the bypass water passage 9 is connected to the head-side cooling water passage 2a. It is connected to the.
[0039]
The block-side cooling water passage 2b is connected to a discharge port of the mechanical water pump 10.
[0040]
The thermostat valve 7 is a flow path switching valve that shuts off one of the second cooling water passage 6 and the bypass water passage 9 according to the temperature of the cooling water. Specifically, the thermostat valve 7 shuts off the second cooling water passage 6 when the temperature of the cooling water flowing through the thermostat valve 7 is lower than a predetermined valve opening temperature: Temp1 (for example, 80 ° C. to 90 ° C.). At the same time, the bypass water passage 9 is opened to make the third cooling water passage 8 and the bypass water passage 9 conductive. When the temperature of the cooling water flowing through the thermostat valve 7 is equal to or higher than the valve opening temperature: Temp1, the thermostat valve 7 opens the second cooling water passage 6 and simultaneously shuts off the bypass water passage 9 to form the third cooling water passage. 8 and the second cooling water passage 6.
[0041]
Next, a heater hose 11 is connected in the middle of the first cooling water passage 4, and the heater hose 11 is connected in a middle of the third cooling water passage 8. In the middle of the heater hose 11, a heater core 12 for exchanging heat between cooling water and air for indoor heating is arranged.
[0042]
A first bypass passage 13a is connected to a portion of the heater hose 11 located between the heater core 12 and the third cooling water passage 8, and the first bypass passage 13a is connected to a cooling water suction port of the electric water pump 14. I have. Subsequently, the cooling water discharge port of the electric water pump 14 is connected to the cooling water inlet 15a of the heat storage container 15 via the second bypass passage 13b. Further, the cooling water outlet 15b of the heat storage container 15 is connected to the heater hose 11 located between the heater core 12 and the first cooling water passage 4 via the third bypass passage 13c.
[0043]
The heat storage container 15 is a container for storing the cooling water while storing the heat of the cooling water. When new cooling water flows in from the cooling water inlet 15a, it is stored in the heat storage container 15 instead of the new cooling water. The cooling water is configured to be discharged from the cooling water outlet 15b. A one-way valve for preventing the backflow of the cooling water is attached to each of the cooling water inlet 15a and the cooling water outlet 15b of the heat storage container 15.
[0044]
The electric water pump 14 is a water pump that uses the output power of the battery 43 as a drive source, and is configured to discharge the cooling water sucked from the cooling water suction port from the cooling water discharge port.
[0045]
Here, in the heater hose 11 located between the heater core 12 and the first cooling water passage 4, a portion on the first cooling water passage 4 side with respect to a connection portion of the third bypass passage 13c is referred to as a first heater hose 11a. At the same time, a portion on the side of the heater core 12 is referred to as a second heater hose 11b. Further, in the heater hose 11 located between the heater core 12 and the third cooling water passage 8, a portion on the heater core 12 side with respect to a connection portion of the first bypass passage 13a is referred to as a third heater hose 11c, and The portion on the cooling water channel 8 side is referred to as a fourth heater hose 11d.
[0046]
Next, a warmer hose 19 is further connected to a connection portion between the heater hose 11 and the third bypass passage 13c, and the warmer hose 19 is connected in the middle of the third heater hose 11c. In the middle of the warmer hose 19, an ATF warmer 20 for exchanging heat between cooling water and transmission oil (ATF: Automatic Transmission Fluid) is arranged.
[0047]
Here, in the warmer hose 19, a portion between the connection portion between the heater hose 11 and the third bypass passage 13c and the ATF warmer 20 is referred to as a first warmer hose 19a, and the ATF warmer 20 and the A part between the three heater hose 11c and the connection part is referred to as a second warmer hose 19b.
[0048]
A passage switching valve 16 is provided at a connection between the first heater hose 11a, the second heater hose 11b, the third bypass passage 13c, and the first warmer hose 19a. The flow path switching valve 16 is configured to selectively block any one or more of the four paths, and is driven by an actuator such as a step motor.
[0049]
A first water temperature sensor 17 that outputs an electric signal corresponding to the temperature of the cooling water flowing in the third bypass passage 13c is attached near a portion of the third bypass passage 13c communicating with the heat storage container 15. Further, a second water temperature sensor 18 that outputs an electric signal corresponding to the temperature of the cooling water flowing in the head-side cooling water passage 2a is attached near the connection portion of the head-side cooling water passage 2a with the first cooling water passage 4. I have.
[0050]
An electronic control unit (ECU: Electronic Control Unit) 39 for controlling the operation state of the cooling water circulation system is provided in the cooling water circulation system configured as described above. The ECU 39 is an arithmetic and logic operation circuit including a CPU, a ROM, a RAM, a backup RAM, an input port, an output port, an A / D converter, and the like. The ECU 39 may be provided independently of the ECU for controlling the operating state of the internal combustion engine 1, or may be used in combination.
[0051]
The ECU 39 includes an ignition switch 40, a starter switch 41, and a switch (heater switch) 42 of an indoor heating device provided in the vehicle compartment, in addition to the first water temperature sensor 17, the second water temperature sensor 18, and the battery 43 described above. Are electrically connected, and output signals of these various sensors are input to the ECU 39.
[0052]
Further, the ECU 39 is electrically connected to the electric water pump 14 and the flow path switching valve 16 described above, so that the ECU 39 can control the electric water pump 14 and the flow path switching valve 16.
[0053]
Specifically, the ECU 39 operates according to an application program stored in the ROM, and executes a circulation circuit switching control for switching a circulation circuit of the cooling water in the cooling water circulation system.
[0054]
Next, circulation of the cooling water at the time of warming up the internal combustion engine 1 before starting according to the present embodiment will be described.
[0055]
FIG. 2 is a diagram showing circulation of cooling water at the time of warming-up of the internal combustion engine 1 according to the present embodiment before starting.
[0056]
The ECU 39 performs the circulation according to the present invention so as to shut off the second heater hose 11b and the first warmer hose 19a corresponding to the second circulation circuit according to the present invention before performing the pre-start-up warm-up of the internal combustion engine 1. The flow path switching valve 16 corresponding to the circuit switching means is controlled (corresponding to the first circulation circuit switching control according to the present invention).
[0057]
Thereafter, before starting the internal combustion engine 1 (before the cranking of the internal combustion engine 1 is started), the ECU 39 issues an internal combustion engine warm-up execution command according to the present invention, and the battery 43 to operate the electric water pump 14. Power supply to the electric water pump 14 is allowed.
[0058]
Here, the ECU 39 corresponds to a warm-up execution command unit according to the present invention, and the battery 43 and the electric water pump 14 correspond to a warm-up execution unit according to the present invention.
[0059]
In this case, the first heater hose 11a and the third bypass passage 13c communicate with each other, and the mechanical water pump 10 does not operate, and only the electric water pump 14 operates.
[0060]
Therefore, as shown in FIG. 2, the electric water pump 14 → the second bypass passage 13b → the heat storage container 15 → the third bypass passage 13c → the flow switching valve 16 → the first heater hose 11a → the first cooling water passage 4 → the head side. An internal combustion engine circulation circuit 31 (in which cooling water flows in the order of the cooling water passage 2a, the block-side cooling water passage 2b, the mechanical water pump 10, the third cooling water passage 8, the fourth heater hose 11d, the first bypass passage 13a, and the electric water pump 14). (Corresponding to a first circulation circuit according to the present invention).
[0061]
When the internal combustion engine circulation circuit 31 is established, high-temperature cooling water (hereinafter, referred to as hot water) stored in the heat storage container 15 is discharged from the cooling water outlet 15b, and the third bypass passage 13c, the flow path switching valve 16 , Through the first heater hose 11a and the first cooling water passage 4 to flow into the head side cooling water passage 2a of the internal combustion engine 1.
[0062]
The hot water that has flowed into the head-side cooling water passage 2a will then flow into the block-side cooling water passage 2b, and the flowing hot water heats the cylinder head 1a and the cylinder block 1b, thereby warming up the internal combustion engine 1.
[0063]
Here, when the ECU 39 permits the power supply from the battery 43 to the electric water pump 14, that is, when the ECU 39 issues the internal combustion engine warm-up execution command according to the present invention, for example, (1) the vehicle door When the door is opened and the door switch (not shown) is turned on, (2) when the driver sits on the seat in the passenger compartment and the seating sensor (not shown) in the seat sends an ON signal, (3). For example, when the anti-theft device that was on when the vehicle was stopped is turned off to start the vehicle.
[0064]
Further, for example, when the driver sits on the seat in the above-mentioned (2) vehicle interior and a seating sensor (not shown) in the seat transmits an ON signal, the ECU 39 supplies power from the battery 43 to the electric water pump 14. When the cooling water circulation circuit is switched to the internal combustion engine circulation circuit 31 side by controlling the flow path switching valve 16, that is, when the first circulation circuit switching control according to the present invention is performed, For example, when the door of the vehicle is opened and a door switch (not shown) is turned on.
[0065]
In addition, when the cooling water circulation circuit is switched to the internal combustion engine circulation circuit 31 side by controlling the flow path switching valve 16, that is, when the first circulation circuit switching control according to the present invention is performed, the internal combustion engine 1 is stopped. It may be when it was done. In this case, the cooling water circulation circuit has been switched to the internal combustion engine circulation circuit 31 side at the time of performing the pre-startup warm-up of the internal combustion engine 1.
[0066]
According to the present embodiment, before the ECU 39 permits the power supply from the battery 43 to the electric water pump 14, that is, before the ECU 39 issues the internal combustion engine warm-up execution command according to the present invention, the flow path switching valve 16 Accordingly, the second heater hose 11b and the first warmer hose 19a are shut off, the first heater hose 11a communicates with the third bypass passage 13c, and the cooling water circulation circuit is switched to the internal combustion engine circulation circuit 31 side. Therefore, it is possible to prevent the warm water flowing out of the heat storage container 15 from flowing into the second heater hose 11b and the first warmer hose 19a after the operation of the electric water pump 14.
[0067]
Next, the circulation circuit switching control in the case where the cooling water circulation circuit is switched to the internal combustion engine circulation circuit 31 when the internal combustion engine 1 is stopped in the present embodiment will be specifically described with reference to FIG.
FIG. 3 is a flowchart showing a control circuit switching control routine of the cooling water when the internal combustion engine is stopped in the present embodiment.
[0068]
First, in S101, the ECU 39 determines whether or not the ignition switch 40 has been turned off.
[0069]
If it is determined in S101 that the ignition switch 40 has not been turned off, the ECU 39 temporarily terminates the execution of this routine.
[0070]
If it is determined in step S101 that the ignition switch 40 has been turned off, the ECU 39 proceeds to step S102 and issues a command to stop the internal combustion engine 1.
[0071]
Next, the ECU 39 proceeds to S103, in which the second heater hose 11b and the first warmer hose 19a are cut off, and the flow path switching valve 16 is controlled so as to connect the first heater hose 11a and the third bypass passage 13c. (That is, the first circulation circuit switching control according to the present invention is performed).
[0072]
In S103, the second heater hose 11b and the first warmer hose 19a are cut off, and the first heater hose 11a and the third bypass passage 13c are communicated. In S104, the ECU 39 stops and ends the execution of this routine. I do.
[0073]
The ECU 39 stopped in S104 of this routine restarts next time before the internal combustion engine 1 is warmed up. For example, the ECU 39 may be started at the above-mentioned times (1), (2), (3) and the like. In this case, after starting, the ECU 39 issues an internal combustion engine warm-up execution command according to the present invention.
[0074]
By executing this routine, when the internal combustion engine 1 is stopped, the second heater hose 11b and the first warmer hose 19a are shut off, and the first heater hose 11a and the third bypass passage 13c are communicated. That is, the cooling water circulation circuit is switched to the internal combustion engine circulation circuit 31 described above.
[0075]
Therefore, at the next time when the internal combustion engine 1 is warmed up before the internal combustion engine 1 is started (at the time when the internal combustion engine warming-up execution command according to the present invention is issued from the ECU 39), the circulation circuit of the coolant flows through the internal combustion engine. Since the circuit 31 is provided, the warm water flowing out of the heat storage container 15 into the circulation circuit after the warming-up of the internal combustion engine 1 does not flow out to the second heater hose 11b and the first warmer hose 19a.
[0076]
In addition, the warm water stored in the heat storage container 15 is supplied to the internal combustion engine 1 immediately after the internal combustion engine 1 starts warming up.
[0077]
In the present embodiment, the first circulation circuit switching control is performed before the warm-up before the internal combustion engine 1 is started. However, the warm-up before the internal combustion engine 1 is not performed and the internal combustion engine 1 is started. Similarly, when the internal combustion engine 1 is sometimes warmed up, the ECU 39 performs the first circulation circuit switching control before the ECU 39 issues the internal combustion engine warming up execution command according to the present invention.
[0078]
When the internal combustion engine 1 is to be warmed up at the time of starting the internal combustion engine 1, a start command for the internal combustion engine 1 is issued from the ECU 39, and the mechanical water pump 10 starts operating when the internal combustion engine 1 starts. When the mechanical water pump 10 operates, warm water circulates in the internal combustion engine circulation circuit 31 and the internal combustion engine 1 is warmed up. At this time, the first circulation circuit switching control is performed before the start command of the internal combustion engine 1 is issued from the ECU 39 (for example, when the internal combustion engine 1 is stopped).
[0079]
<Second embodiment>
Next, a second embodiment of an internal combustion engine provided with a heat storage device according to the present invention will be described with reference to the drawings.
[0080]
The configuration of the internal combustion engine including the heat storage device in the present embodiment is the same as that in FIG.
[0081]
In the present embodiment, after the pre-startup warm-up of the internal combustion engine 1, the amount of hot water remaining in the heat storage container 15 is equal to or greater than a predetermined value, and if necessary, the internal temperature of the heater core 12, the ATF warmer 20, etc. The hot water remaining in the heat storage container 15 is supplied to devices other than the engine 1.
[0082]
FIG. 4 is a diagram illustrating a circulation circuit of the cooling water when hot water is supplied to heater core 12 in the present embodiment. FIG. 5 is a diagram showing a circuit for circulating cooling water when supplying warm water to the ATF warmer 20.
[0083]
When the amount of hot water remaining in the heat storage container 15 is equal to or greater than a predetermined value after the warm-up before the start of the internal combustion engine 1 and the hot water needs to be supplied to the heater core 12, the ECU 39 sets the first heater hose 11a And the first warmer hose 19a are shut off, and the flow path switching valve 16 corresponding to the circulation circuit switching means according to the present invention is controlled so as to connect the second heater hose 11b and the third bypass passage 13c (the present invention). ).
[0084]
Thereafter, the ECU 39 activates the electric water pump 14 so that the electric water pump 14 → the second bypass passage 13b → the heat storage container 15 → the third bypass passage 13c → the flow switching valve 16 → the second as shown in FIG. A heater core circulation circuit 32 (corresponding to a second circulation circuit according to the present invention) through which cooling water flows in the order of heater hose 11b → heater core 12 → third heater hose 11c → first bypass passage 13a → electric water pump 14 is established.
[0085]
When the heater circulation circuit 32 is established, the hot water stored in the heat storage container 15 is supplied to the heater core 12.
[0086]
If the amount of hot water remaining in the heat storage container 15 is equal to or greater than a predetermined value after the completion of the warm-up before the internal combustion engine 1 is started, and it is necessary to supply hot water to the ATF warmer 20, the ECU 39 sets the In order to shut off the first heater hose 11a and the second heater hose 11b and to connect the first warmer hose 19a and the third bypass passage 13c, the control unit controls the flow path switching valve 16 corresponding to the circulation circuit switching means according to the present invention. (Corresponding to the second circulation circuit switching control according to the present invention).
[0087]
Thereafter, the ECU 39 activates the electric water pump 16 so that the electric water pump 14 → the second bypass passage 13b → the heat storage container 15 → the third bypass passage 13c → the flow switching valve 16 → the first as shown in FIG. ATF warmer circulation circuit 33 (second circulation circuit according to the present invention) through which cooling water flows in the order of warmer hose 19a → ATF warmer 20 → second warmer hose 19b → third heater hose 11c → first bypass passage 13a → electric water pump 14. Holds).
[0088]
When the ATF warmer circulation circuit 33 is established, the hot water stored in the heat storage container 15 is supplied to the ATF warmer 20.
[0089]
Next, in the present embodiment, hot water supply control in a case where hot water is supplied to devices other than the internal combustion engine 1 such as the heater core 12 and / or the ATF warmer 20 after the pre-start-up warm-up of the internal combustion engine 1 is completed is shown in FIG. A specific description will be given along.
FIG. 9 shows a hot water supply control routine in the case where hot water is supplied to a device other than the internal combustion engine 1 such as the heater core 12 and / or the ATF warmer 20 after the pre-startup warm-up of the internal combustion engine 1 is completed in the present embodiment. It is a flowchart figure shown.
[0090]
First, in S201, the ECU 39 determines whether or not the pre-start warm-up of the internal combustion engine 1 has been completed. For example, if the power supply from the battery 43 to the electric water pump 14 that is operating when the internal combustion engine 1 is warmed up before the start is stopped, the ECU 39 determines that the pre-startup warm-up of the internal combustion engine 1 has ended. .
[0091]
If it is determined in S201 that the pre-start warm-up of the internal combustion engine 1 has not ended, the ECU 39 temporarily ends the execution of this routine.
[0092]
If it is determined in S201 that the pre-start warm-up of the internal combustion engine 1 has been completed, the ECU 39 proceeds to S202, and the warm water supplied from the heat storage container 15 to the internal combustion engine 1 during the pre-start warm-up of the internal combustion engine 1 is determined. The warm water supply amount Vph at the time of warm-up before start, which is the amount, is calculated.
[0093]
Since the viscosity of the cooling water changes depending on the temperature, as shown in FIG. 6, even when the operation time of the electric water pump 14 (that is, the warm-up time before starting the internal combustion engine 1) is higher, the higher the temperature, the more the internal combustion The pre-start-up warm water supply amount Vph, which is the amount of hot water supplied from the heat storage container 15 to the internal combustion engine 1 during the pre-start-up warm-up of the engine 1, increases.
[0094]
As shown in FIG. 6, the ROM of the ECU 39 stores the warm-up hot water supply amount Vph before the start-up and the water temperature Tef in the internal combustion engine before the warm-up before the start-up of the internal combustion engine 1 detected by the second water temperature sensor 18 as shown in FIG. The relationship between the pre-startup warm-up execution time of the internal combustion engine 1, that is, the operation time tpp of the electric water pump 14, is recorded in advance as a three-dimensional map.
[0095]
In step S202, the ECU 39 calculates the pre-start-up warm-up hot water supply amount Vph based on the three-dimensional map.
[0096]
Next, the ECU 39 proceeds to S203 and subtracts the pre-start-up warm-up hot water supply amount Vph calculated in S202 from the capacity V0 of the heat storage container 15 to calculate the amount of heat storage remaining in the heat storage container 15. The remaining hot water amount Vref in the container is calculated.
Here, the ECU 39 corresponds to a heat medium heat capacity calculation unit according to the present invention.
[0097]
After calculating the remaining hot water amount Vref in the heat storage container in S203, the ECU 39 proceeds to S204, and calculates the amount of hot water necessary for warming up the internal combustion engine 1 before starting the next time when the internal combustion engine 1 is started. A warm-up hot water supply amount Vres (corresponding to the required heat capacity for the next engine warm-up according to the present invention) is calculated before the next start-up.
[0098]
Depending on the temperature of the internal combustion engine 1 and the temperature of the hot water stored in the heat storage container 15, the amount of hot water required for the pre-startup warm-up of the internal combustion engine 1 the next time the internal combustion engine 1 is started , The warm-up hot water supply amount Vres before the next start-up changes. That is, as shown in FIG. 7, the higher the water temperature Tea in the internal combustion engine after the internal combustion engine 1 is warmed up before the start, and the higher the temperature Tc of the hot water remaining in the heat storage container 15, the higher the warm-up before the next start. The hourly hot water supply amount Vres decreases.
[0099]
As shown in FIG. 7, the ROM of the ECU 39 stores the hot water supply amount Vres at the time of warm-up before the next start and the water temperature Tea in the internal combustion engine after the warm-up before the start of the internal combustion engine 1 detected by the second water temperature sensor 18, as shown in FIG. The relationship between the water temperature and the heat storage container outlet water temperature Tc detected by the first water temperature sensor 17 is recorded in advance as a three-dimensional map.
[0100]
In step S204, the ECU 39 calculates the pre-startup warm-up hot water supply amount Vres based on the three-dimensional map.
[0101]
Next, the ECU 39 proceeds to S205 and subtracts the pre-startup warming-up hot water supply amount Vres calculated in S204 from the remaining hot water amount Vref in the heat storage container calculated in S203, thereby starting the internal combustion engine 1 before starting. After the warm-up, the after-heat hot water supply amount Vah, which is the amount of hot water that can be supplied to devices other than the internal combustion engine such as the heater core 12 and / or the ATF warmer 20, is calculated.
[0102]
After calculating the after-heat hot water supply amount Vah in S205, the ECU 39 proceeds to S206 and determines whether or not the after-heat hot water supply amount Vah calculated in S205 is greater than zero.
[0103]
When it is determined in S206 that the after-heat hot water supply amount Vah is equal to or less than 0, the execution of this routine is temporarily terminated.
[0104]
If it is determined in step S206 that the after-heat hot water supply amount Vah is equal to or greater than 0, the ECU 39 proceeds to step S207 and determines which device other than the internal combustion engine 1 such as the heater core 12 and / or the ATF warmer 20 has. It is determined whether the hot water remaining in the heat storage container 15 is to be supplied.
[0105]
Next, the ECU 39 proceeds to S208, in which the hot water remaining in the heat storage container 15 is supplied to a device (for example, the heater core 12 and / or the ATF warmer 20) other than the internal combustion engine 1 to which the hot water determined in S207 is supplied. The cooling water circulation circuit is switched so that it can be supplied.
[0106]
For example, when the supply destination of the hot water is determined to be the heater core 12 in S207, the ECU 39 shuts off the first heater hose 11a and the first warmer hose 19a, and the second heater hose 11b and the third bypass passage 13c. And the flow path switching valve 16 is controlled so as to communicate with. Also, for example, when the supply destination of the hot water is determined to be the ATF warmer 20 in S207, the ECU 39 shuts off the first heater hose 11a and the second heater hose 11b, and connects the first warmer hose 19a with the third warmer hose 19a. The flow path switching valve 16 is controlled so as to communicate with the bypass passage 13c.
[0107]
Next, in step S208, the ECU 39 switches the circulation circuit of the cooling water to a device other than the internal combustion engine 1 to which the hot water is to be supplied. The required operation time tah of the electric water pump 14 that circulates hot water to supply hot water to the device is calculated.
[0108]
As described above, since the viscosity of the cooling water changes depending on the temperature, even if the after-heat hot water supply amount Vah, which is the amount of hot water supplied to devices other than the internal combustion engine, calculated in S205, is the same, The required operation time tah of the electric water pump 14 for circulating hot water to supply hot water to devices other than the engine is different. That is, as shown in FIG. 8, the higher the water temperature Tea in the internal combustion engine after the internal combustion engine 1 is warmed up before starting, the shorter the required operation time tah of the electric water pump becomes. Further, as the after-heat hot water supply amount Vah is larger, the required operation time tah of the electric water pump is longer.
[0109]
The ROM and the like of the ECU 39 store the required operation time tah of the electric water pump, the water temperature Tea in the internal combustion engine after the warm-up before the start of the internal combustion engine 1 detected by the second water temperature sensor 18 as shown in FIG. The relationship between the heating hot water supply amount Vah and the heating hot water supply amount Vah is recorded in advance as a three-dimensional map.
[0110]
In step S209, the ECU 39 calculates the electric water pump required operation time tah based on the three-dimensional map.
[0111]
Next, the ECU 39 proceeds to S210, in which power supply from the battery 43 to the electric water pump 14 is permitted, and the electric water pump 14 is operated.
[0112]
In S211, the ECU 39 determines whether or not the operation time tp of the electric water pump 14 has exceeded the electric water pump required operation time tah calculated in S209.
[0113]
If the ECU 39 determines in step S211 that the operation time tp of the electric water pump 14 has not exceeded the electric water pump required operation time tah, the ECU 39 continues the operation of the electric water pump 14 and operates the electric water pump 14. When it is determined that the time tp has elapsed the electric water pump required operation time tah, the process proceeds to S212, in which the operation of the electric water pump 14 is stopped, and this routine is executed.
[0114]
As described above, by executing the present routine, after the internal combustion engine 1 is once stopped, the hot water required for warming up the internal combustion engine 1 before starting the next time before restarting the internal combustion engine 1 is provided. It can be secured in the heat storage container 15. Therefore, even if the internal combustion engine 1 is stopped before supplying new hot water to the heat storage container 15 after supplying the hot water to a part other than the internal combustion engine 1, the next time the internal combustion engine 1 is restarted. The warm-up of the internal combustion engine 1 before starting can be sufficiently performed.
[0115]
In the present embodiment, the internal combustion engine 1 is warmed up before the internal combustion engine 1 is started, but may be warmed up when the internal combustion engine 1 is started.
[0116]
【The invention's effect】
According to the internal combustion engine provided with the heat storage device according to the present invention, when warming up the internal combustion engine before or at the time of starting the internal combustion engine, the internal combustion engine warming-up execution command is issued from the warm-up execution instruction means to the warm-up execution means. Before the discharge, the heat medium circulation circuit is switched to the first circulation circuit in which the heat medium circulates via the internal combustion engine, so that a high-temperature heat medium other than the internal combustion engine is not supplied. At the same time, immediately after the start of warming up the internal combustion engine, a high-temperature heat medium is supplied to the internal combustion engine, so that the internal combustion engine can be quickly warmed up.
[0117]
Further, after the internal combustion engine is once stopped, a high-temperature heat medium required for warming up the internal combustion engine next time before or at the start of the internal combustion engine is secured in the heat storage container, Shortage of the heat medium for warming up the heater can be prevented.
[0118]
As a result, according to the internal combustion engine provided with the heat storage container according to the present invention, the internal combustion engine can be reliably warmed up without deteriorating the warming-up efficiency.
[Brief description of the drawings]
FIG. 1 is a diagram showing a cooling water circulation system of an internal combustion engine provided with a heat storage device according to the present invention.
FIG. 2 is a diagram showing circulation of cooling water at the time of warming-up of an internal combustion engine having a heat storage device before starting according to the first embodiment;
FIG. 3 is a flowchart showing a first circulation circuit switching control when the internal combustion engine is stopped in the first embodiment.
FIG. 4 is a diagram showing a circulation circuit when supplying hot water to a heater core of an internal combustion engine having a heat storage device according to the second embodiment;
FIG. 5 is a diagram showing a circulation circuit when hot water is supplied to an ATF warmer of an internal combustion engine equipped with a heat storage device according to the second embodiment.
FIG. 6 is a diagram showing a relationship between a water temperature in an internal combustion engine before a warm-up before a start, an operation time of an electric water pump, and a hot water supply amount during a warm-up before a start.
FIG. 7 is a diagram showing a relationship among a water temperature in an internal combustion engine after a warm-up before a start, a water temperature at an outlet of a heat storage container, and a hot water supply amount at a warm-up before a next start.
FIG. 8 is a diagram showing a relationship between a water temperature in the internal combustion engine after warm-up before starting, an after-heat hot water supply amount, and a required operation time of the electric water pump.
FIG. 9 is a flowchart illustrating a hot water supply control routine when hot water is supplied to a device other than the internal combustion engine in the second embodiment.
[Explanation of symbols]
1 ... Internal combustion engine
1a ... Cylinder head
1b ・ ・ ・ Cylinder block
2a: Head side cooling water channel
2b: Block side cooling water channel
5 ... radiator
10 ... mechanical water pump
11a: 1st heater hose
11b ... second heater hose
11c: Third heater hose
11d: 4th heater hose
12 ... heater core
13a: First bypass passage
13b: second bypass passage
13c: Third bypass passage
14 ・ ・ ・ Electric water pump
15 ... thermal storage container
15a ・ ・ ・ Cooling water inlet
15b ・ ・ ・ Cooling water outlet
16 ... Channel switching valve
17 1st water temperature sensor
18 Second water temperature sensor
19a: 1st warmer hose
19b: 2nd warmer hose
20 ATF warmer
31 ・ ・ ・ Circulation circuit of internal combustion engine
32 ... heater core circulation circuit
33 ・ ・ ・ ATF warmer circulation circuit
39 ・ ・ ・ ECU
40 ... ignition switch
41 ・ ・ ・ Starter switch
42 ... heater switch
43 ・ ・ ・ Battery

Claims (5)

A heat storage container for storing a heat medium in a heat storage state,
A first circulation circuit through which the heat medium circulates via an internal combustion engine;
A second circulation circuit in which the heat medium circulates via a device other than the internal combustion engine,
Warm-up execution means for executing warm-up of the internal combustion engine before or at the time of starting of the internal combustion engine by the high-temperature heat medium stored in the heat storage container,
Warm-up execution command means for issuing an internal-combustion engine warm-up execution command to the warm-up execution means to execute warm-up of the internal combustion engine;
Circulating circuit switching means for switching between the first circulating circuit and the second circulating circuit,
A first circulating circuit that switches the circulating circuit of the heat medium to the first circulating circuit by the circulating circuit switching unit before the internal combustion engine warm-up executing command is issued from the warm-up executing command unit to the warm-up executing unit. An internal combustion engine equipped with a heat storage device that performs switching control. 2. The internal combustion engine according to claim 1, wherein the first circulation circuit switching control is performed when the internal combustion engine is stopped. A heat storage container for storing a heat medium in a heat storage state,
A first circulation circuit through which the heat medium circulates via an internal combustion engine;
A second circulation circuit in which the heat medium circulates via a device other than the internal combustion engine,
Heat medium heat capacity calculating means for calculating the heat capacity of the high temperature heat medium remaining in the heat storage container after circulating the high temperature heat medium stored in the heat storage container through the first circulation circuit and warming up the internal combustion engine. When,
Circulating circuit switching means for switching between the first circulating circuit and the second circulating circuit,
The heat capacity of the high-temperature heat medium remaining in the heat storage container after warming up the internal combustion engine calculated by the heat medium heat capacity calculation means is equal to or more than a predetermined amount, and a high-temperature heat medium is supplied to a device other than the internal combustion engine. An internal combustion engine equipped with a heat storage device, characterized in that when it is necessary to supply a heat medium, the circulation circuit switching means performs second circulation circuit switching control for switching a circulation circuit to the second circulation circuit. The predetermined amount is a next engine warm-up required heat capacity required for warming up the internal combustion engine after the internal combustion engine is temporarily stopped, next time before or after restarting the internal combustion engine. An internal combustion engine provided with the heat storage device according to claim 3. The internal combustion engine provided with a heat storage device according to claim 4, wherein the heat capacity required for the next engine warm-up is determined by a temperature of the heat medium in the first circulation circuit.

Images