JP2005055060A - Magnetic heat accumulating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic heat accumulating device capable of exchanging the heat with a cooling circuit of a heat generating member of a vehicle, such as an engine and a stack of fuel cells. <P>SOLUTION: This magnetic heat accumulating device comprises magnetic heat accumulators 20-27 respectively having a magnetic heat accumulating material 19 of which a temperature is raised by magnetocaloric effect to be kept in a high-temperature state, when being excited, and of which the temperature is lowered to be kept in a low-temperature state, when being demagnetized, and magnetic field generating means 20a-27a for generating the magnetic field in each of the magnetic heat storage materials 19 of the magnetic heat accumulators 20-27. The magnetic heat storage materials 19 are kept in any of the high-temperature state and the low-temperature state by the magnetic field generating means 20a-27a, and the magnetic heat accumulators 20-27 and the magnetic field generating means 20a-27a are respectively mounted in a cooling water circuit 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is provided in a cooling circuit for a heating element such as an engine of an internal combustion engine or a fuel cell stack, and a magnetic heat storage material that increases in temperature when excited and decreases in temperature when demagnetized due to a magnetocaloric effect. The present invention relates to a magnetic heat storage device provided.

Conventionally, as described in Patent Document 1, there is a magnetic heat storage device that can be used even at room temperature. In this magnetic heat storage device, the magnetic heat storage material can take two states, a high temperature state in which the magnetic heat storage material is excited by a magnetic field, and a low temperature state in which the magnetic heat storage material is demagnetized. In the cooler, the heat exchange fluid dissipates heat to the heat sink, and in the cooler, the heat exchange fluid absorbs heat from the cooler.
Japanese Patent Laid-Open No. 2102-106999

  By the way, if it is a magnetic heat storage material that can be used at room temperature as in the above prior art, it can also be used for heating and cooling the cooling circuits of heating elements such as stacks of engines and fuel cells due to temperature changes accompanying excitation and demagnetization. It is.

  An object of the present invention is to provide a magnetic heat storage device that can exchange heat with a cooling circuit of a heating element of a vehicle such as an engine or a stack of fuel cells.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a magnetic heat storage device applied to a cooling circuit (1) through which a cooling fluid for cooling a heating element (2) of a vehicle flows. A magnetic regenerator (20-27) having a magnetic regenerator material (19) that rises in temperature due to the magnetocaloric effect to become a high temperature state and decreases in temperature when demagnetized, and a magnetic regenerator (20 To 27) are provided with magnetic field generation means (20a to 27a) for generating a magnetic field, respectively, and the magnetic heat storage material (19) is in a high temperature state or a low temperature state by the magnetic field generation means (20a to 27a). One of the states can be achieved, and the magnetic regenerator (20 to 27) and the magnetic field generating means (20a to 27a) are arranged in the cooling circuit (1), respectively.

  According to this, before the heating element (2) of the vehicle generates heat, the magnetic heat storage material (19) is energized to bring it to a high temperature state and heat the cooling fluid flowing through the heating element (2) of the vehicle, thereby heating the heating element. (2) can be heated. On the other hand, since the temperature of the cooling fluid rises when the vehicle heating element (2) generates heat, the magnetic regenerator having the magnetic heat storage material (19) can absorb heat from the cooling fluid by demagnetizing. That is, not only can the temperature of the cooling fluid be lowered, but also heat can be stored in the magnetic heat storage material (19). In this way, the temperature of a heating element such as an engine or a fuel cell stack can be adjusted by properly using the two states of the heat absorption state and the heat dissipation state in accordance with the temperature of the heating element (2).

  As in the second aspect of the present invention, in the first aspect, the magnetic heat storage device is applied to the cooling circuit (1) having the electric heater (9), and the temperature of the cooling fluid is lower than a predetermined value. If the cooling fluid is sometimes heated by the electric heater (9), the electric heater (9) can be an auxiliary heating device for the magnetic regenerator (20 to 27).

  According to a third aspect of the present invention, in the first or second aspect, the first pump (10) that circulates the cooling fluid in one direction of the cooling circuit (1) and the second that circulates the cooling fluid in the direction opposite to the one direction. A magnetic heat storage device applied to a cooling circuit (1) having a pump (11), wherein the magnetic heat storage devices (20 to 27) are a first magnetic heat storage device (20) and a second magnetic heat storage device (21). The magnetic field generating means (20a to 27a) is composed of a first magnetic field generating means (20a) and a second magnetic field generating means (21a), and the first pump (10) is activated. Then, the second pump (11) is stopped, and when the second pump (11) is started, the first pump (10) is stopped, and the cooling fluid flow in the cooling circuit (1) In one direction, the first magnetic heat storage upstream of the heating element (2) (20) and the first magnetic field generating means (20a) are respectively arranged, and the second magnetic regenerator (21) and the second magnetic field generating means (21a) are respectively arranged on the downstream side of the heating element (2). When the first pump (10) is activated, the first magnetic field generating means (20a) excites the magnetic heat storage material (19) of the first magnetic heat accumulator (20) and the second magnetic field generating means. When the magnetic heat storage material (19) of the second magnetic heat storage device (21) is demagnetized by (21a) and the second pump (11) is started, the second magnetic heat storage device (21a) The magnetic heat storage material (19) of 21) is excited and the magnetic heat storage material (19) of the first magnetic heat storage device (20) is demagnetized by the first magnetic field generating means (20a). And

  According to this, the cooling fluid heated by the magnetic heat storage material (19) of the first magnetic regenerator (20) radiates heat to the heating element (2), and the cooling fluid radiated to the heating element (2) becomes the second magnetic heat storage. Heat is absorbed by the vessel (21). In this case, the flow direction of the cooling fluid is determined by the first pump (10). On the other hand, the cooling fluid heated by the magnetic heat storage material (19) of the second magnetic regenerator (21) radiates heat to the heating element (2), and the cooling fluid radiated to the heating element (2) becomes the first magnetic regenerator ( 20). In this case, the direction in which the cooling fluid flows is determined by the second pump (11). In this way, the heating element (2) can be alternately heated.

  As in the invention of claim 4, in claim 3, the magnetic heat storage material (19) of the first magnetic heat accumulator (20) is excited by the first magnetic field generation means (20a) and the second magnetic field generation means. The state where the magnetic heat storage material (19) of the second magnetic heat storage device (21) is demagnetized by (21a), and the magnetic heat storage material (19) of the first magnetic heat storage device (20) by the first magnetic field generation means (20a). Is demagnetized and the state in which the magnetic heat storage material (19) of the second magnetic heat storage device (21) is excited alternately by the second magnetic field generation means (21a) every predetermined time, the heating element This is because the temperature distribution of (2) can be made uniform.

  The invention according to claim 5 is the magnetic heat storage device according to claim 3 or 4, wherein the magnetic heat storage device is applied to a cooling circuit (1) having a radiator (5) for radiating heat of the cooling fluid to the air. The chambers (20-27) are constituted by a third magnetic heat accumulator (22) and a fourth magnetic heat accumulator (23), and the magnetic field generating means (20a-27a) is the third magnetic field generating means (22a). And a fourth magnetic field generating means (23a), and a third magnetic regenerator (22) and a third magnetic field generating means (22a) are connected to a pipe connected to one side of the radiator (5), respectively. A fourth magnetic heat accumulator (23) and a fourth magnetic field generating means (23a) are respectively arranged in a pipe connected to the other side of the radiator (5) of the cooling circuit (1), When the cooling fluid flows from the one side pipe to the other side pipe, The magnetic heat storage material (19) of the third magnetic heat storage device (22) is excited by the field generation means (22a) and the magnetic heat storage material (19 of the fourth magnetic heat storage device (23) is excited by the fourth magnetic field generation means (23a). ) Is demagnetized, and when the cooling fluid flows from the other side pipe toward the one side pipe, the fourth magnetic field generating means (23a) causes the magnetic heat storage material (23) ( 19) is excited, and the magnetic heat storage material (19) of the third magnetic heat storage device (22) is demagnetized by the third magnetic field generating means (22a).

  According to this, when a cooling fluid flows from one side of the radiator (5) toward the other side, the magnetic heat storage material (19) of the third magnetic heat storage device (22) is excited by the third magnetic field generating means (22a). Thus, the cooling fluid to the radiator can be heated. The cooling fluid thus heated is absorbed by the demagnetization of the magnetic heat storage material (19) of the fourth magnetic heat storage device (23) after being radiated by the heat radiator (5). On the other hand, when the cooling fluid flows from the other side of the radiator (5) toward the one side, the magnetic heat storage material (19) of the fourth magnetic heat storage device (23) is excited by the fourth magnetic field generation means (23a). Can heat the cooling fluid to the radiator. The cooling fluid thus heated is absorbed by the demagnetization of the magnetic heat storage material (19) of the third magnetic heat storage device (22) after being radiated by the heat radiator (5). Therefore, the heat dissipation effect can be enhanced as the temperature difference between the cooling fluid flowing through the radiator (5) and the air increases. Thereby, a heat radiator (5) can be reduced in size.

  As in the sixth aspect of the invention, in the fifth aspect, the third magnetic regenerator (22) and the fourth magnetic regenerator are higher than the high temperature state of the first magnetic regenerator (20) and the second magnetic regenerator (21). If the high-temperature state of the heat accumulator (23) is configured to be high, the heating performance at a low temperature of the heating element (2) and the heat dissipation performance at a high temperature of the radiator (5) can be made compatible.

  According to a seventh aspect of the present invention, in any one of the third to sixth aspects, the magnetism is applied to a cooling circuit (1) having an oil cooler (13) that exchanges heat between the cooling fluid and oil. It is a heat storage device, the magnetic regenerator (20-27) is composed of a fifth magnetic regenerator (24) and a sixth magnetic regenerator (25), and the magnetic field generating means (20a-27a) A fifth magnetic regenerator (24) and a fifth magnetic field are connected to a pipe connected to one side of the oil cooler (13), which is composed of a fifth magnetic field generating means (24a) and a sixth magnetic field generating means (25a). The generating means (24a) is disposed, and the sixth magnetic regenerator (25) and the sixth magnetic field generating means (25a) are respectively disposed on the pipe connected to the other side of the oil cooler (13). Cooling from one side of the pipe to the other side When the fluid flows, the fifth magnetic field generating means (24a) demagnetizes the magnetic heat storage material (19) of the fifth magnetic heat storage device (24) and excites the magnetic heat storage material (19) of the sixth magnetic heat storage device (25). When the cooling fluid flows from the other side pipe toward the one side pipe, the sixth magnetic field generating means (25a) causes the magnetic heat storage material (19) of the sixth magnetic heat storage device (25) to flow. The magnetic heat storage material (19) of the fifth magnetic heat storage device (24) is excited by the fifth magnetic field generation means (24a) while being demagnetized.

  Thereby, the temperature of the oil cooler (13) can be lowered at the normal time when the heating element (2) is warmed. Further, at the time of starting the heating element (2), the temperature of the oil cooler (13) can be raised earlier than that of the heating element (2).

  As in the eighth aspect of the invention, in the seventh aspect, the fifth magnetic regenerator (24) and the sixth magnetic regenerator are lower than the low temperature state of the first magnetic regenerator (20) and the second magnetic regenerator (21). If the low temperature state of the heat accumulator (25) is configured to be low, the temperature of the oil cooler (13) can be stably controlled.

  As in the ninth aspect of the invention, in any one of the third to eighth aspects, the heating heat exchanger (16) for exchanging heat between the cooling fluid and the air blown into the passenger compartment is provided. A magnetic heat storage device applied to the cooling circuit (1), wherein the magnetic heat storage device (20 to 27) is composed of a seventh magnetic heat storage device (26) and an eighth magnetic heat storage device (27), The magnetic field generating means (20a to 27a) includes a seventh magnetic field generating means (26a) and an eighth magnetic field generating means (27a), and one end of the heating heat exchanger (16) of the cooling circuit (1). A seventh magnetic regenerator (26) and a seventh magnetic field generating means (26a) are respectively arranged in the pipe connected to the side, and the other end side of the heating heat exchanger (16) of the cooling circuit (1) The eighth magnetic regenerator (27) and the eighth magnetic field generating means (27a) are connected to the pipe connected to When the cooling fluid flows from the one end side pipe of the heating heat exchanger (16) to the other end side pipe, the seventh magnetic heat accumulator is provided by the seventh magnetic field generating means (26a). The magnetic heat storage material (19) of (26) is excited and the magnetic heat storage material (19) of the eighth magnetic heat storage device (27) is demagnetized by the eighth magnetic field generation means (27a). When the cooling fluid flows from the other end side pipe of the heat exchanger (16) toward the one end side pipe, the eighth magnetic field generating means (27a) causes the magnetic heat storage material (19) of the eighth magnetic heat storage unit (27). ) Is energized and the magnetic heat storage material (19) of the seventh magnetic regenerator (26) is demagnetized by the seventh magnetic field generating means (26a), the heating heat exchanger (16) The heating time can be shortened. Moreover, since the temperature of a cooling fluid can be raised, a passenger | crew's feeling of heating can be improved. Further, since the cooling water is sent to the heating heat exchanger (16) after the temperature of the cooling water is raised, the temperature difference from the air becomes large, so that the performance of the heating heat exchanger (16) is improved. Increased temporarily. Therefore, the heating heat exchanger (16) can be reduced in size.

  As in the invention described in claim 10, in the ninth aspect, the seventh magnetic regenerator (26) and the eighth magnetic regenerator are higher than the high temperature state of the first magnetic regenerator (20) and the second magnetic regenerator (21). If the high-temperature state of the heat accumulator (27) is configured to be high, the performance of the heating heat exchanger (16) can be improved.

  As in the eleventh aspect of the present invention, in the magnetic heat storage device according to any one of the first to tenth aspects, the piping through which the cooling fluid flows is applied to a cooling circuit (1) formed of a nonmagnetic material. And if the magnetic regenerator (20-27) is provided in piping, the bad effect by a residual magnetism can be prevented.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows a first embodiment of the present invention applied to a cooling device for a vehicle engine. Reference numeral 1 denotes a cooling water circuit.

  In the central portion of the cooling water circuit 1, there is a water-cooled engine 2 that is a heating element of the present invention. A cooling water temperature detection sensor 3 for detecting the temperature of the cooling water is provided in the vicinity of the engine 2. Reference numeral 4 denotes an EGR cooler that cools the exhaust gas for EGR.

  A radiator 5 cools the cooling water by exchanging heat between the cooling air blown by the cooling fan 6 and the cooling water of the engine 2. Here, the cooling fan 6 is composed of an electric axial fan driven by a motor 6a.

  In the cooling water circuit 1, a bypass circuit 7 and a thermostat valve 8 (cooling water temperature responsive valve) for controlling the flow of cooling water between the radiator 5 and the engine 2 are provided in parallel with the radiator 5. This thermostat valve 8 opens and closes the flow path of the cooling water circuit 1 by displacing the valve body using a change in volume due to the temperature of the thermowax. The bypass circuit 7 is provided with an electric heater 9 that heats the cooling water when energized.

  In the cooling water circuit 1 of the engine 2, a first pump 10 that circulates the cooling water is disposed, and a second pump 11 is disposed in parallel with the first pump 10. The first and second pumps 10 and 11 are separately driven by two motors (not shown). When the first pump 10 is driven, the second pump 11 is stopped and the second pump 11 is turned on. When driven, the first pump 10 is stopped. A three-way valve 12 is provided in the vicinity of the first and second pumps 10 and 11. The three-way valve 12 is provided to switch the flow direction of the cooling water to the first and second pumps 10 and 11. The first pump 10 is configured to flow cooling water toward the engine 2. Further, the second pump 11 is configured to flow cooling water in a direction opposite to the cooling water flow of the first pump 10. Further, the above-described three-way valve 12 causes the flow path between the first pump 10 and the engine 2 to communicate with each other when the first pump 10 is started, and simultaneously with the second pump 11 when the second pump 11 is started. The flow path with the engine 2 is communicated.

  An oil cooler 13 is provided between the three-way valve 12 and the engine 2. The oil cooler 13 exchanges heat between oil and cooling water in the torque converter 14 for a vehicle automatic transmission. Reference numeral 15 denotes a third pump for circulating oil.

  Reference numeral 16 denotes a heater core (heating heat exchanger) of an automotive air conditioner, which heats the conditioned air blown by the air-conditioning blower fan 17 by heat exchange with cooling water. As is well known, the heater core 16 is installed on the air downstream side of the cooling evaporator in a ventilation passage in an air conditioning duct (not shown), and the cold air cooled by the evaporator is reheated to a predetermined temperature to enter the vehicle interior. Controls the air temperature of the air. Here, the air-conditioning blower fan 17 is a centrifugal multiblade fan that is driven by a motor 17a and has a large number of blade portions (blade portions) arranged in an annular shape. Reference numeral 18 denotes a heater valve that opens and closes the flow path of the cooling water to the heater core 16.

  Incidentally, when the cooling water flow of the first pump 10 passes through the engine 2, it passes through the EGR cooler 4 and branches in two directions when the heater valve is open. Cooling water flows toward the thermostat valve 8 on one side in the two directions. When the thermostat valve 8 is open, the cooling water flows toward the radiator 5 and the electric heater 9. When the thermostat valve 8 is closed, the cooling water flows toward the electric heater 9 and returns to the first pump 10. On the other side in the two directions, the cooling water flows toward the heater valve 18 and the heater core 16, and the cooling water flows toward the first pump 10.

  On the other hand, the flow of the cooling water of the second pump 11 flows in the direction opposite to the engine 2 and branches in two directions when the heater valve 18 is open. On one side of the two directions, the cooling water flows toward the radiator 5 when the thermostat valve 8 is open. The coolant passes through the thermostat valve 8, the engine 2, and the three-way valve 12 and returns to the second pump 11. On the other side in the two directions, cooling water flows toward the heater core 16, passes through the heater valve 18, the engine 2, and the three-way valve 12 and returns to the second pump 11.

  A first magnetic regenerator 20 and a second magnetic regenerator 21 are disposed at the left and right portions of the cooling water circuit 1. The first and second magnetic regenerators 20 and 21 are filled with a magnetic regenerator material 19, respectively. For example, a gadolinium-based material can be used as the magnetic heat storage material 19. Moreover, the predetermined area | region of the cooling water piping by which the 1st, 2nd magnetic regenerators 20 and 21 of the cooling water circuit 1 are arrange | positioned is formed with the nonmagnetic material. For example, the nonmagnetic material is made of stainless steel.

  The first and second magnetic regenerators 20 and 21 are respectively provided with a first electromagnet 20a and a second electromagnet 21a which are magnetic field generating means of the present invention. The first electromagnet 20a and the second electromagnet 21a are adapted to excite the magnetic heat storage material 19 of the first and second magnetic regenerators 20 and 21 by flowing current, and by cutting off the current. The magnetic heat storage material 19 is demagnetized. Incidentally, the 1st electromagnet 20a and the 2nd electromagnet 21a are the known structures which form a magnetic field by sending an electric current through the coil wound around the iron core, for example.

  Next, the operation of this embodiment in the above configuration will be described. FIG. 2 is a flowchart showing an outline of a control program executed by a control device (not shown). The control program in FIG. 2 starts when the engine 2 is started, starts the first pump 10 in step S10, and causes the three-way valve 12 to communicate with the flow path between the first pump 10 and the engine 2. It progresses to S20 and it is determined whether cooling water temperature is lower than T1 (for example, about 20 degreeC).

  When the cooling water temperature is lower than T1 in step S20, the process proceeds to step S30 and the electric heater 9 is turned on. When the cooling water temperature is higher than T1, the process proceeds to step S40 and the cooling water temperature is T2 (for example, It is determined whether the temperature is lower than about 50 ° C. Thus, when the cooling water temperature is lower than T1, the temperature of the thermowax of the radiator thermostat valve 8 is low, and the cooling water flowing through the cooling water circuit 1 flows to the bypass circuit 7 at this temperature. Thereby, since cooling water does not flow into the radiator 5, the cooling fan 6 is maintained in a stopped state. Incidentally, when the cooling water temperature becomes higher than T2, the cooling water flows into the radiator 5, and the cooling fan 6 is also driven by the motor 6a.

  Next, when the power of the electric heater 9 is turned on in step S30, the process proceeds to step S50, the first electromagnet 20a is turned on, the magnetic heat storage material 19 of the first magnetic regenerator 20 is brought into a high temperature state, and the second electromagnet 21a is turned on. After turning off and setting the magnetic heat storage material 19 of the second magnetic heat storage device 21 to a low temperature state, the process proceeds to step S60 and this state is maintained for M hours. Note that turning on the first electromagnet 20a means forming a magnetic field by passing an electric current through the first electromagnet 20a. Further, turning off the second electromagnet 21a means that the magnetic field that interrupts the current flow by stopping the current flow of the second electromagnet 21a is not generated. Thereby, since the cooling water heated by the magnetized heat storage material 19 of the first magnetic heat storage device 20 flows toward the engine 2, the warm-up operation of the engine 2 can be promoted. The M time is, for example, about 2 to 4 seconds, and is 3 seconds in this embodiment.

  If M time passes in step S60, it will progress to step S70 and will stop the 1st pump 10 and will start the 2nd pump 11 simultaneously. At the same time, the flow path between the first pump 10 and the engine 2 is closed by the three-way valve 12, and the flow path between the second pump 11 and the engine 2 is communicated. As a result, the direction in which the cooling water flows is opposite to the flow of the cooling water by the first pump 10.

  When the flow direction of the cooling water is reversed in this way, the process proceeds to step S80, where the first electromagnet 20a is turned off and the second electromagnet 21a is turned on. Then, the process proceeds to step S90, and this state is maintained for M hours. Thereby, since the cooling water heated by the magnetic heat storage material 19 excited by the second magnetic heat storage device 21 flows toward the engine 2, the warm-up operation of the engine 2 can be promoted. The M time is about 3 seconds as described above. And when M time passes, it will return to step S20 again and will repeat control.

  Subsequently, in step S40, when the cooling water temperature is lower than T2, the process proceeds to step S100, and when the cooling water temperature is higher than T2, the process proceeds to step S110.

  In step S100, the electric heater 9 is turned off. When the electric heater 9 is turned off, the process proceeds to step S120 where the first electromagnet 20a is turned on and the second electromagnet 21a is turned off. Then, the process proceeds to step S130 and this state is maintained for M hours.

  If M time passes in step S130, it will progress to step S140 and will make the flow direction of a cooling water the opposite direction with respect to the flow of the cooling water of the 1st pump 10 similarly to step S70.

  When the flow direction of the cooling water is reversed in this way, the process proceeds to step S150, where the first electromagnet 20a is turned off and the second electromagnet 21a is turned on. Then, the process proceeds to step S90, and this state is maintained for M hours. And when M time passes, it will return to step S20 again and will repeat control.

  Subsequently, in step S110, if the cooling water temperature is lower than T3 (for example, about 80 ° C.), the process proceeds to step S160, and if the cooling water temperature is higher than T3, the process proceeds to step S170.

  In step S160, the electric heater 9 is turned off. When the electric heater 9 is turned off, the process proceeds to step S180, the first and second electromagnets 20a and 21a are turned off, and then the process proceeds to step S190 and this state is maintained for M hours. Thereby, since heat can be absorbed from the temperature of the cooling water, heat can be stored.

  If M time passes in step S190, it will progress to step S200 and will make the flow direction of a cooling water into the opposite direction with respect to the flow of the cooling water of the 1st pump 10 similarly to step S70.

  When the flow direction of the cooling water is reversed in this way, the process proceeds to step S90, and this state is maintained for M hours. And when M time passes, it will return to step S20 again and will repeat control.

  Subsequently, when the cooling water temperature is higher than T3, in step S170, if the electric heater 9 is turned off, the process proceeds to step S210, the first electromagnet 20a is turned off, and the second electromagnet 21a is turned on. Then, the process proceeds to step S220, and this state is maintained for M hours.

  When M time elapses in step S220, the process proceeds to step S230, and the flow direction of the cooling water is changed to the opposite direction to the flow of the cooling water of the first pump 10 as in step S70.

  When the direction of the coolant flow is reversed, the process proceeds to step S240, the first electromagnet 20a is turned on, the second electromagnet 21a is turned off, and the process proceeds to step S90, where this state is maintained for M hours. And when M time passes, it will return to step S20 again and will repeat control.

Next, the effect in this embodiment in the said structure is demonstrated.
(1) Immediately after the engine 2 is started on a cold day in winter, the magnetic heat storage material 19 of the first and second magnetic regenerators 20 and 21 is excited to be in a high temperature state, and the cooling water of the engine 2 is alternately switched. The engine 2 can be heated indirectly. On the other hand, when the engine 2 is started and warms up, the temperature of the cooling water also rises. Therefore, the magnetic heat storage material 19 of the first and second magnetic heat accumulators 20 and 21 is demagnetized to be in a low temperature state and cooled. Can absorb heat from water. That is, not only the temperature of the cooling water can be lowered, but also heat can be stored in the magnetic heat storage material 19. In this way, not only can the engine 2 and the EGR cooler 4 be warmed up early by properly using the two states of the heat absorption state and the heat dissipation state according to the coolant temperature of the engine 2, but when the engine 2 becomes warm There is also a cooling effect due to heat absorption.
(2) Since the electric heater 9 is provided, the capacity shortage of the first and second magnetic regenerators 20 and 21 can be compensated.
(3) The temperature distribution of the engine 2 can be made uniform by alternately repeating excitation and demagnetization of the magnetic heat storage material 19 of the first and second magnetic heat storage devices 20 and 21. Therefore, the combustion state can be stabilized.
(4) Since the engine 2 and the EGR cooler 4 can be heated by the first and second magnetic regenerators 20 and 21, the engine 2 can be warmed up early by warming the EGR gas.
(5) Since the first and second magnetic regenerators 20 and 21 can heat the engine 2 and the oil cooler 13, low-viscosity oil is circulated in the torque converter 14 by the third pump 15. be able to. Therefore, power saving is achieved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment, in step S10, cooling water flows from the first pump 10 toward the engine 2, and in step S110, if the cooling water temperature exceeds T3, the process proceeds to step S210, and the first electromagnet 20a is turned off. The second electromagnet 21a was turned on. Further, when the flow direction of the cooling water is reversed in step S230, the first electromagnet 20a is turned on and the second electromagnet 21a is turned off in step S240.

  In the second embodiment, as shown in FIG. 3, when the process proceeds from step S110 to step S211, the first electromagnet 20a is turned on, the second electromagnet 21a is turned off, and when the process proceeds from step S230 to step S241, the first electromagnet 20a is turned on. The difference is that the second electromagnet 21a was turned on.

  According to the second embodiment, the first electromagnet 20a is turned on by the first pump 10 when the cooling water that has cooled the engine 2 flows toward the radiator 5, and heat is radiated from the first magnetic regenerator 20 to the cooling water. Thus, the heat dissipation efficiency of the radiator 5 is increased, and then the second electromagnet 21 a is turned off, so that the second magnetic regenerator 21 absorbs heat from the cooling water radiated by the radiator 5.

  On the other hand, when the cooling water that has cooled the engine 2 flows toward the radiator 5 by the second pump 11, the second electromagnet 21 a is turned on, and heat is radiated from the second magnetic regenerator 21 to the cooling water. By increasing the heat dissipation efficiency and then turning off the first electromagnet 20a, the first magnetic regenerator 20 absorbs heat from the cooling water radiated by the radiator 5. Incidentally, it is known that the heat dissipation efficiency of the radiator 5 increases as the temperature difference between the air to be cooled and the cooling water flowing through the radiator 5 increases. Therefore, only when heat is radiated by the radiator 5, heat is radiated from one side of the first and second magnetic regenerators 20 and 21 to the cooling water, and the temperature difference between the cooling water and the air is increased, thereby enhancing the heat radiating effect. The other side of the first and second magnetic regenerators 20 and 21 absorbs heat from the cooled cooling water. Therefore, the efficiency of the radiator 5 is improved by the amount that the heat dissipation effect is increased by the temperature difference between the air and the cooling water. Therefore, the radiator 5 can be made smaller than the conventional one.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. In the first and second embodiments, the first and second magnetic regenerators 20 and 21 and the first and second electromagnets 20a and 21a are arranged in the cooling water circuit 1. The third embodiment is different in that the third to eighth magnetic regenerators 22 to 27 and the third to eighth electromagnets 22a to 27a are added to the cooling water circuit 1 of the first and second embodiments. In the first and second embodiments, only the electric heater 9 is provided in the bypass circuit 7, but in the third embodiment, the first and second magnetic heat accumulators 20 and 21 are arranged in the bypass circuit 7. doing.

  In FIG. 4, first to eighth magnetic heat accumulators 20 to 27 are disposed in the cooling water circuit 1. In the cooling water flow by the first pump 10, the third magnetic regenerator 22 and the third electromagnet 22 a are arranged on the upstream side of the radiator 5, and the fourth magnetic regenerator 23 and the fourth electromagnet 22 a are arranged on the downstream side of the radiator 5. An electromagnet 23a is arranged.

  Between the three-way valve 12 and the engine 2, fifth and sixth magnetic heat accumulators 24 and 25 and fifth and sixth electromagnets 24a and 25a are arranged. The fifth magnetic regenerator 24 and the fifth electromagnet 24a are arranged upstream of the oil cooler 13 in the cooling water flow by the first pump 10, and the sixth magnetic regenerator 25 and the sixth electromagnet 25a are oil coolers. 13 on the downstream side.

  In the cooling water flow by the first pump 10, the seventh magnetic heat accumulator 26 and the seventh electromagnet 26 a are disposed on the upstream side of the heater core 16, and the eighth magnetic heat accumulator 27 and the eighth electromagnet 26 a are disposed on the downstream side of the heater core 16. An electromagnet 27a is arranged.

  Next, the operation of this embodiment in the above configuration will be described. FIG. 5 is a flowchart showing an outline of a control program executed by a control device (not shown). Note that the control program of FIG. 5 starts when the engine 2 is started, and the basic operation thereof is almost the same as the flowchart described in the first embodiment. Therefore, the same processes as those in the first embodiment are denoted by the same reference numerals, and only differences are described by changing the reference numerals.

  In step S212, the third electromagnet 22a is turned off and the fourth electromagnet 23a is turned on. In step S242, the third electromagnet 22a is turned on and the fourth electromagnet 23a is turned off. The magnetic phase transition temperatures of the third and fourth magnetic regenerators 22 and 23 due to the magnetic fields of the third and fourth electromagnets 22a and 23a are the first and second magnetisms due to the magnetic fields of the first and second electromagnets 20a and 21a. It is made higher than the magnetic phase transition temperature of the heat accumulators 20 and 21. Incidentally, the magnetic phase transition temperature is a temperature when the magnetic heat storage material 19 is excited by a magnetic field to be in a high temperature state and a temperature when it is demagnetized to be in a low temperature state. This temperature varies depending on the strength of the magnetic field and the type of the magnetic heat storage material 19. Therefore, the strength of the magnetic field may be changed, or the magnetic heat storage material 19 may be changed and disposed.

  According to the third embodiment, it is possible to achieve both the heating performance when the engine 2 by the first and second magnetic regenerators 20 and 21 is in a low temperature state and the heat dissipation performance at the high temperature of the radiator 5.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a flowchart showing an outline of a control program executed by a control device (not shown). In addition, the structure of the cooling water circuit 1 in 4th Embodiment is the same as 3rd Embodiment.

  The control program of FIG. 6 is started by starting the engine 2 of the cooling water circuit 1 of the third embodiment. In step S110, the cooling water temperature is lower than T3 (for example, about 80 ° C.). In this case, the process proceeds to step S183, the fifth and sixth electromagnets 24a, 25a are turned off, and then the process proceeds to step S190, where this state is maintained for M hours. If M time passes in step S190, it will progress to step S200 and will switch the flow direction of a cooling water to the opposite direction. When the flow direction of the cooling water is switched in step S200, the process proceeds to step S90, and this state is maintained for M hours. The switching of the coolant flow direction is the same process as step S70 in the flowchart described in the first embodiment. If the cooling water temperature is higher than T3, the process proceeds to step S213.

  In step S213, the fifth electromagnet 24a is turned off to demagnetize the magnetic heat storage material 19 of the fifth magnetic heat storage device 24 to a low temperature state, and the sixth electromagnet 25a is turned on to turn on the magnetic heat storage material 19 of the sixth magnetic heat storage device 25. Is excited to reach a high temperature state, the process proceeds to step S220, and this state is maintained for M hours. The M time is the same as the time described in the first to third embodiments, and is about 3 seconds, for example. If M time passes in step S220, it will progress to step S230 and will change the flow direction of a cooling water to the opposite direction. When the flow direction of the cooling water is switched in step S230, the process proceeds to step S243, the fifth electromagnet 24a is turned on, the sixth electromagnet 25a is turned off, the process proceeds to step S90, this state is maintained for M hours, and step is performed again. Returning to S110, the control is continued.

  According to the fourth embodiment, the fifth electromagnet 24a absorbs heat from the cooling water by setting the magnetic heat storage material 19 of the fifth magnetic regenerator 24 to a low temperature state, and supplies this cooling water to the oil cooler 13. During the steady state, the temperature of the oil cooler 13 can be made lower than the temperature of the cooling water. The magnetic phase transition temperatures of the fifth and sixth magnetic regenerators 24 and 25 due to the magnetic fields of the fifth electromagnet and the sixth electromagnets 24a and 25a are the first and second due to the magnetic fields of the first and second electromagnets 20a and 21a. It is made to become lower than the magnetic phase transition temperature of the magnetic regenerators 20 and 21. Thus, the temperature of the oil cooler 13 can be stably achieved by setting the magnetic phase transition temperature of the magnetic heat storage material 19 to be lower than the magnetic phase transition temperature of the first and second magnetic heat storage devices 20 and 21. Can be controlled. In order to change the magnetic phase transition temperature, the strength of the magnetic field may be changed, or the type of the magnetic heat storage material 19 may be changed and disposed.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a flowchart showing an outline of a control program executed by a control device (not shown). The control program of FIG. 7 is started by starting the engine 2 of the cooling water circuit 1 of the third embodiment, proceeds to step S10, starts the first pump 10, and cools from the first pump 10 toward the engine 2. Proceed to step S214 so that water flows. In addition, the structure of the cooling water circuit 1 in 5th Embodiment is the same as 3rd Embodiment.

  In step S214, the seventh electromagnet 26a is turned on to bring the magnetic heat storage material 19 of the seventh magnetic heat storage device 26 into a high temperature state, and the eighth electromagnet 27a is turned off to bring the magnetic heat storage material 19 of the eighth magnetic heat storage device 27 into a low temperature state. In step S220, this state is maintained for M hours. The M time is the same as the time described in the first to fourth embodiments, and is about 3 seconds, for example. If M time passes in step S220, it will progress to step S230 and will change the flow direction of a cooling water to the opposite direction. The switching of the coolant flow direction is the same process as step S70 in the flowchart described in the first embodiment.

  When the flow direction of the cooling water is switched in step S230, the process proceeds to step S244. In step S244, the seventh electromagnet 26a is turned off to place the seventh magnetic regenerator 26 in a low temperature state, the eighth electromagnet 27a is turned on to bring the eighth magnetic regenerator 27 into a high temperature state, and the process proceeds to step S90. For M hours. If M time is maintained in step S90, it returns to step S214 and continues control.

  According to the fifth embodiment, the cooling water flowing toward the heater core 16 is always heated by setting one of the seventh electromagnet 26a and the eighth electromagnet 27a on the upstream side in the cooling water flow to a high temperature state. Therefore, the temperature raising time of the heater core 16 can be shortened. Moreover, since heat is radiated from the magnetic heat storage material 19 to the cooling water, the passenger's feeling of heating can be improved. Furthermore, since the temperature difference between the air and the heater core 16 becomes large, the heating operation can be performed efficiently.

(Other embodiments)
(1) In the first to fifth embodiments, a plurality of magnetic regenerators 20 to 27 and a plurality of electromagnets 20a to 27a are arranged in the cooling water circuit 1 to heat and cool the cooling water. In the present embodiment, only one magnetic heat accumulator is arranged in the cooling water circuit 1, and when the outside air is low, the magnetic heat storage material of the magnetic heat accumulator is excited by the magnetic field to radiate heat to the cooling water. The warm-up effect may be enhanced. Further, when the cooling water is warmed by the engine 2, heat may be stored by demagnetizing the magnetic heat storage material of the magnetic heat storage device to absorb heat from the cooling water.
(2) In the first to fifth embodiments, the magnetic field generating means is constituted by the first to eighth electromagnets 20a to 27a. However, the magnetic heat storage material may be excited by generating a magnetic field by a permanent magnet. For demagnetization of the magnetic heat storage material, the position of the electromagnet may be moved by driving means such as a motor.
(3) In the first to fifth embodiments, the first to eighth magnetic regenerators 20 to 27 and the first to eighth electromagnets 20a to 27a are arranged in the coolant circuit 1 of the engine 2, respectively. In the present embodiment, the first to eighth magnetic regenerators 20 to 27 and the first to eighth electromagnets 20a to 27a may be arranged in a cooling circuit that cools the battery stack.

It is a whole lineblock diagram concerning the 1st and 2nd embodiment of the present invention. It is a flowchart which shows the action | operation of 1st Embodiment. It is a flowchart which shows the action | operation of 2nd Embodiment. It is a whole block diagram concerning 3rd-5th embodiment. It is a flowchart which shows the action | operation of 3rd Embodiment. It is a flowchart which shows the action | operation of 4th Embodiment. It is a flowchart which shows the action | operation of 5th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cooling circuit, 2 ... Engine, 5 ... Radiator, 10 ... 1st pump, 11 ... 2nd pump,
12 ... 3-way valve, 13 ... Oil cooler, 16 ... Heater core.

Claims (11)

A magnetic heat storage device applied to a cooling circuit (1) through which a cooling fluid for cooling a heating element (2) of a vehicle flows,
A magnetic regenerator (20-27) having a magnetic regenerator material (19) that, when energized, rises in temperature due to the magnetocaloric effect to a high temperature state, and demagnetizes to a low temperature state;
Magnetic field generating means (20a to 27a) for generating a magnetic field in each of the magnetic heat storage materials (19) of the magnetic heat storage device (20 to 27),
The magnetic heat storage material (19) can be brought into either the high temperature state or the low temperature state by the magnetic field generation means (20a to 27a),
The magnetic heat storage device, wherein the magnetic heat storage device (20 to 27) and the magnetic field generation means (20a to 27a) are arranged in the cooling circuit (1), respectively. A magnetic heat storage device applied to the cooling circuit (1) having an electric heater (9),
The magnetic heat storage device according to claim 1, wherein the cooling fluid is heated by the electric heater (9) when the temperature of the cooling fluid is lower than a predetermined value. The cooling circuit (1) having a first pump (10) for circulating the cooling fluid in one direction of the cooling circuit (1) and a second pump (11) for circulating the cooling fluid in a direction opposite to the one direction. A magnetic heat storage device applied to
The magnetic regenerator (20-27) is composed of a first magnetic regenerator (20) and a second magnetic regenerator (21),
The magnetic field generating means (20a to 27a) is composed of a first magnetic field generating means (20a) and a second magnetic field generating means (21a),
When the first pump (10) is started, the second pump (11) is stopped, and when the second pump (11) is started, the first pump (10) is stopped. And
In the cooling fluid flow in the one direction, the first magnetic regenerator (20) and the first magnetic field generating means (20a) are respectively arranged upstream of the heating element (2), and the heat generation The second magnetic heat accumulator (21) and the second magnetic field generating means (21a) are respectively arranged on the downstream side of the body (2),
When the first pump (10) is activated, the first magnetic field generating means (20a) excites the magnetic heat storage material (19) of the first magnetic heat storage device (20) and generates the second magnetic field. When the magnetic heat storage material (19) of the second magnetic heat storage device (21) is demagnetized by the means (21a) and the second pump (11) is started, the second magnetic field generation means (21a) The magnetic heat storage material (19) of the second magnetic heat storage device (21) is excited, and the first magnetic field generation means (20a) demagnetizes the magnetic heat storage material (19) of the first magnetic heat storage device (20). The magnetic heat storage device according to claim 1, wherein the magnetic heat storage device is configured as described above. The magnetic heat storage material (19) of the first magnetic heat accumulator (20) is excited by the first magnetic field generation means (20a) and the second magnetic heat accumulator (21a) is excited by the second magnetic field generation means (21a). ) Of the magnetic heat storage material (19) is demagnetized, and the first magnetic field generation means (20a) demagnetizes the magnetic heat storage material (19) of the first magnetic heat storage device (20). The state in which the magnetic heat storage material (19) of the second magnetic heat storage device (21) is excited by the two magnetic field generation means (21a) is alternately switched every predetermined time. The magnetic heat storage device described in 1. A magnetic heat storage device applied to the cooling circuit (1) having a radiator (5) for radiating heat of the cooling fluid to the air,
The magnetic regenerator (20 to 27) is composed of a third magnetic regenerator (22) and a fourth magnetic regenerator (23),
The magnetic field generating means (20a to 27a) is composed of a third magnetic field generating means (22a) and a fourth magnetic field generating means (23a),
The third magnetic regenerator (22) and the third magnetic field generating means (22a) are respectively arranged in a pipe connected to one side of the radiator (5), and the cooling circuit (1) The fourth magnetic heat accumulator (23) and the fourth magnetic field generation means (23a) are respectively arranged on a pipe connected to the other side of the radiator (5),
When the cooling fluid flows from the one side pipe toward the other side pipe, the magnetic heat storage material (19) of the third magnetic heat storage unit (22) is excited by the third magnetic field generating means (22a). And the magnetic heat storage material (19) of the fourth magnetic heat storage device (23) is demagnetized by the fourth magnetic field generation means (23a),
When the cooling fluid flows from the other side pipe toward the one side pipe, the magnetic heat storage material (19) of the fourth magnetic heat accumulator (23) is excited by the fourth magnetic field generating means (23a). In addition, the magnetic heat storage material (19) of the third magnetic heat storage device (22) is demagnetized by the third magnetic field generation means (22a). Magnetic heat storage device. The high temperature state of the third magnetic heat storage device (22) and the fourth magnetic heat storage device (23) is higher than the high temperature state of the first magnetic heat storage device (20) and the second magnetic heat storage device (21). It is comprised so that it may become. The magnetic heat storage apparatus of Claim 5 characterized by the above-mentioned. A magnetic heat storage device applied to the cooling circuit (1) having an oil cooler (13) for exchanging heat between the cooling fluid and oil,
The magnetic regenerator (20 to 27) is composed of a fifth magnetic regenerator (24) and a sixth magnetic regenerator (25),
The magnetic field generating means (20a to 27a) is composed of a fifth magnetic field generating means (24a) and a sixth magnetic field generating means (25a),
The fifth magnetic regenerator (24) and the fifth magnetic field generating means (24a) are respectively arranged on a pipe connected to one side of the oil cooler (13), and other than the oil cooler (13) The sixth magnetic regenerator (25) and the sixth magnetic field generating means (25a) are respectively arranged in the pipe connected to the side,
When a cooling fluid flows from the one side pipe toward the other side pipe, the magnetic heat storage material (19) of the fifth magnetic heat storage device (24) is demagnetized by the fifth magnetic field generating means (24a). And the magnetic heat storage material (19) of the sixth magnetic heat storage device (25) is excited,
When the cooling fluid flows from the other side pipe toward the one side pipe, the magnetic heat storage material (19) of the sixth magnetic heat storage device (25) is demagnetized by the sixth magnetic field generation means (25a). The magnetic heat storage material (19) of the fifth magnetic regenerator (24) is excited by the fifth magnetic field generating means (24a). The magnetic heat storage device according to one. The low temperature state of the fifth magnetic regenerator (24) and the sixth magnetic regenerator (25) is lower than the low temperature state of the first magnetic regenerator (20) and the second magnetic regenerator (21). It is comprised so that it may become. The magnetic thermal storage apparatus of Claim 7 characterized by the above-mentioned. A magnetic heat storage device applied to the cooling circuit (1) having a heating heat exchanger (16) for exchanging heat between the cooling fluid and air blown into the passenger compartment,
The magnetic regenerator (20 to 27) is composed of a seventh magnetic regenerator (26) and an eighth magnetic regenerator (27),
The magnetic field generating means (20a to 27a) is composed of a seventh magnetic field generating means (26a) and an eighth magnetic field generating means (27a).
The seventh magnetic heat accumulator (26) and the seventh magnetic field generating means (26a) are respectively arranged on pipes connected to one end side of the heating heat exchanger (16) of the cooling circuit (1). And the eighth magnetic regenerator (27) and the eighth magnetic field generating means (27a) are connected to the pipe connected to the other end of the heating heat exchanger (16) of the cooling circuit (1). Has been placed,
When the cooling fluid flows from the one end side pipe of the heating heat exchanger (16) to the other end side pipe, the seventh magnetic heat generating unit (26a) causes the seventh magnetic heat accumulator (26) to The magnetic heat storage material (19) is excited and the eighth magnetic field generation means (27a) demagnetizes the magnetic heat storage material (19) of the eighth magnetic heat storage device (27).
When a cooling fluid flows from the other end side pipe of the heating heat exchanger (16) toward the one end side pipe, the eighth magnetic field generating means (27a) causes the eighth magnetic heat accumulator (27) to The magnetic heat storage material (19) is excited and the seventh magnetic field generation means (26a) demagnetizes the magnetic heat storage material (19) of the seventh magnetic heat storage device (26). A magnetic heat storage device according to any one of claims 3 to 8. The high temperature state of the seventh magnetic heat storage device (26) and the eighth magnetic heat storage device (27) is higher than the high temperature state of the first magnetic heat storage device (20) and the second magnetic heat storage device (21). It is comprised so that it may become. The magnetic heat storage apparatus of Claim 9 characterized by the above-mentioned. A magnetic heat storage device applied to the cooling circuit (1) in which the piping through which the cooling fluid flows is formed of a nonmagnetic material,
The magnetic heat storage device according to any one of claims 1 to 10, wherein the magnetic heat storage device (20 to 27) is provided in the pipe.

Images