JP2010260443A - Vehicle heating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress wasteful energy consumption when heating a cabin while an internal combustion engine is stopped. <P>SOLUTION: In a heating apparatus, in order to heat the cabin 3 by an air conditioner 4 using the heat of cooling water passing through a heater core 7, when a heating request for the cabin 3 is made while the internal combustion engine 1 is stopped, a cooling water flow is prohibited in a fluid flow path 2a of a circulation route 2 by a control valve 8, so that cooling water is circulated through only a bypass passage 2b and a circulation passage 2c of the circulation route 2. Furthermore, a temperature Tw of the cooling water running through the heater core 7 is estimated and obtained. Accordingly, only heating using the heat of cooling water by the air conditioner 4 is performed as much as possible. In order to delay a heating start by a heater 10 as much as possible, the drive control of the air conditioner 4 and the drive or stop of the heater 10 can be appropriately performed based on the temperature Tw of the cooling water passing through the heater core 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle heating device.

  In a vehicle on which an internal combustion engine such as an automobile is mounted, a circulation path for circulating a heat exchange fluid for exchanging heat with the engine is provided for cooling the engine, and heat of the heat exchange fluid is further provided. There is also provided an air conditioner for heating the passenger compartment by using.

  The circulation path includes a fluid passage that passes through the internal combustion engine, a bypass passage that bypasses the engine, and a circulation passage that is connected to the fluid passage and the bypass passage, and circulates the heat exchange fluid therein. It has become. When the internal combustion engine is at a high temperature, the engine is cooled through heat exchange between the heat exchange fluid that circulates in the circulation path and passes through the fluid passage and the internal combustion engine.

  The air conditioner includes a blower that is driven to send warm air into the passenger compartment, and through the drive of the blower, air passes through a heater core provided in the middle of the circulation path in the circulation path. The air after heat exchange with the heat exchange fluid is sent into the passenger compartment. Therefore, when the blower is driven based on the heating request to generate an air flow, the air passes through the heater core and is heated by the heat exchange fluid, and then sent to the passenger compartment, thereby heating the passenger compartment. Will come to be.

  By the way, when the heating request is made at the completion of the stop of the internal combustion engine, the heat exchange fluid is circulated in the circulation path, and the vehicle interior is heated by the air conditioner using the heat of the heat exchange fluid. When performing, the heat exchange fluid circulating in the circulation path exchanges heat with the stopped internal combustion engine when passing through the fluid passage. Then, heat exchange between the heat exchange fluid passing through the stopped internal combustion engine (more precisely, the fluid passage) and the engine causes the heat of the heat exchange fluid to be taken away by the internal combustion engine and circulates in the circulation path. The temperature of the heat exchange fluid is reduced. As a result, when the internal combustion engine is stopped, the heating capacity when the vehicle interior is heated by the air conditioner using the heat of the heat exchange fluid passing through the heater core is reduced.

  In order to cope with such a problem, as disclosed in Patent Document 1, a control valve that is driven to prohibit the flow of the heat exchange fluid in the fluid passage of the circulation path is provided, and the vehicle interior is heated while the engine is stopped. When performing the above, it has been proposed to prohibit the flow of the heat exchange fluid in the fluid passage by the control valve. In this case, since the heat exchange fluid in the circulation path is circulated only in the bypass passage and the circulation passage, the circulating heat exchange fluid passes through the internal combustion engine and the heat of the heat exchange fluid is lost to the internal combustion engine. It is suppressed. As a result, it is possible to suppress a decrease in the temperature of the circulating heat exchange fluid, and as a result, it is possible to suppress the above-described decrease in heating capacity.

  As described above, if the heat exchange fluid circulating in the circulation path is prevented from passing through the stopped internal combustion engine, the temperature drop of the heat exchange fluid can be suppressed, and the heat exchange fluid passing through the heater core can be suppressed. A temperature drop can also be suppressed. However, since the heat exchange fluid is used for heating the vehicle interior without being heated, heat is being deprived from the heat exchange fluid due to the heating by the air conditioner. Even if the temperature drop is suppressed, the heating capacity for heating the passenger compartment will eventually be insufficient for the demand. In view of the above, a heater that generates heat based on a heat source different from that of the internal combustion engine and heats the vehicle interior, for example, an electrothermal heater that generates heat when energized, is provided by the heater while the internal combustion engine is stopped. By heating the room, it is conceivable that the heating capacity when heating the vehicle interior is not short of demand.

JP 2008-230422 A (paragraphs [0066] to [0070], FIGS. 3 and 6)

  In the case where the heater is used for heating the vehicle interior while the internal combustion engine is stopped, from the viewpoint of suppressing the consumption of energy necessary to generate heat from the heater as much as possible, the vehicle interior is heated if possible. It is preferable that the heating is performed only by using the heat of the heat exchange fluid, and the heating of the heater is delayed as much as possible. However, in order to achieve this, it is necessary to appropriately perform drive control of the air conditioner and drive / stop of the heater based on the temperature of the heat exchange fluid passing through the heater core.

  Here, the temperature of the heat exchange fluid circulating in the circulation path can be detected by a temperature sensor provided on the downstream side of the internal combustion engine serving as a heat source in the path, in other words, on the downstream side of the internal combustion engine in the fluid path. It is common. However, if the flow of the heat exchange fluid in the fluid passage is prohibited by the control valve while the internal combustion engine is stopped, the heat exchange fluid circulates only in the bypass passage and the circulation passage in the circulation passage and passes through the heater core. Therefore, the temperature detected by the temperature sensor does not correspond to the temperature of the heat exchange fluid circulating through the heater core as described above.

  For this reason, when heating the passenger compartment while the internal combustion engine is stopped, based on the temperature of the heat exchange fluid detected by the temperature sensor, the air conditioner drive control and the heater are delayed so as to delay the heat generation of the heater as much as possible. Even if it is driven and stopped, it cannot be performed properly. Accordingly, the heating of the heater is started at an early timing, in other words, the heating of the heater is started even though the heating request can be satisfied only by heating the vehicle interior by the air conditioner, and the heater is heated accordingly. Therefore, there is a possibility that energy for use is consumed wastefully.

  The present invention has been made in view of such circumstances, and an object of the present invention is to suppress useless energy consumption due to the heating of the vehicle interior when the internal combustion engine is stopped. It is in providing the heating apparatus of a vehicle.

In the following, means for achieving the above object and its effects are described.
According to the first aspect of the present invention, the circulation path through which the heat exchange fluid circulates is connected to the fluid passage that passes through the internal combustion engine, the bypass passage that bypasses the engine, and the fluid passage and the bypass passage. A circulation passage is provided. When a request for heating the passenger compartment is made while the internal combustion engine is stopped, the control valve prohibits the flow of the heat exchange fluid in the fluid passage in the circulation path, and heat is generated only in the bypass passage and the circulation passage in the circulation path. The exchange fluid is circulated. And the vehicle interior is heated by the air conditioner using the heat of the heat exchange fluid flowing through the heater core provided in the bypass passage. Further, when a heating request for the passenger compartment is made while the internal combustion engine is stopped, the temperature of the heat exchange fluid flowing through the heater core is obtained through the temperature determination means when the passenger compartment is heated while the internal combustion engine is stopped. Then, based on the temperature of the heat exchange fluid obtained through the temperature determining means, the heating means for generating heat to heat the vehicle interior by the air conditioner and to heat the vehicle interior using a heat source different from the internal combustion engine. Fever is generated.

  Accordingly, the heating of the vehicle interior while the internal combustion engine is stopped is performed only by heating using the heat of the heat exchange fluid by the air conditioner as much as possible, and the heat passing through the heater core is delayed as much as possible. Based on the temperature of the exchange fluid, it becomes possible to appropriately perform drive control of the air conditioner and drive / stop of the heat generating means. If the air conditioner drive control and the heat generating means cannot be properly driven and stopped, the heat generating means starts heating at an early timing, in other words, the heating request is made only by heating the vehicle interior by the air conditioner. Although it can be satisfied, the heat generation by the heat generating means may start. In this case, as the heat generating means starts to generate heat too early as described above, the energy for generating heat from the heat generating means is wasted. When such a problem occurs, that is, when the vehicle interior is heated while the internal combustion engine is stopped, it is possible to suppress unnecessary energy consumption due to the heating.

  According to the second aspect of the present invention, when the prohibition of the flow of the heat exchange fluid in the fluid passage by the control valve is not performed, the heat exchange fluid in the circulation passage uses the fluid passage, the bypass passage, and the circulation passage. Therefore, the temperature of the heat exchange fluid detected by the temperature sensor becomes substantially equal to the temperature of the heat exchange fluid passing through the heater core. Then, when the flow of the heat exchange fluid in the fluid passage by the control valve is prohibited along with the heating of the passenger compartment while the internal combustion engine is stopped, the temperature of the heat exchange fluid passing through the heater core gradually increases from the prohibition time. The temperature decreases and differs from the temperature of the heat exchange fluid detected by the temperature sensor. Considering this, if the flow of the heat exchange fluid in the fluid passage by the control valve is prohibited with the heating of the passenger compartment while the internal combustion engine is stopped, the detection from the temperature sensor at the time of the prohibition is performed. Based on the signal and the elapsed time from the prohibition time, the temperature of the heat exchange fluid flowing through the heater core is estimated. Thereby, when heating the passenger compartment while the internal combustion engine is stopped, the temperature of the heat exchange fluid flowing through the heater core can be appropriately determined.

  According to the third aspect of the invention, when the vehicle interior is heated while the internal combustion engine is stopped, the temperature of the heat exchange fluid flowing through the heater core is detected by the temperature sensor. Then, a signal corresponding to the temperature of the heat exchange fluid is output from the temperature sensor, and the temperature of the heat exchange fluid flowing through the heater core is obtained through temperature determination means based on the detection signal. Thereby, when heating the passenger compartment while the internal combustion engine is stopped, the temperature of the heat exchange fluid flowing through the heater core can be appropriately determined.

  According to the fourth aspect of the present invention, when the vehicle interior is heated while the internal combustion engine is stopped, the temperature of the heat exchange fluid flowing through the heater core is a judgment value, that is, the vehicle by the air conditioner using the heat of the heat exchange fluid. The heating of the vehicle interior due to the heat generated by the heat generating means is stopped until the temperature drops to the maximum value in the temperature range in which the vehicle interior cannot be maintained at the required temperature only by the indoor heating. At this time, the vehicle interior is maintained at the required temperature only by heating the vehicle interior by the air conditioner using the heat of the heat exchange fluid flowing through the heater core. Then, after the temperature of the heat exchange fluid flowing through the heater core becomes less than the determination value, the heat generation of the heat generating means is started and the vehicle interior is heated by the heat generation. Therefore, the heating of the vehicle interior due to the heat generated by the heat generating means is performed after the vehicle interior cannot be maintained at the required temperature only by the heating of the vehicle interior by the air conditioner using the heat of the heat exchange fluid flowing through the heater core. This means that the heating of the vehicle interior due to the heat generated by the heat generating means becomes necessary after maintaining the vehicle interior at the required temperature. As described above, when heating the passenger compartment while the internal combustion engine is stopped, it is possible to accurately suppress wasteful consumption of energy for generating heat from the heat generating means.

  According to the fifth aspect of the present invention, the heat exchange fluid that circulates in the bypass passage and the circulation passage in the circulation path after the completion of the stop of the internal combustion engine is provided in the exhaust heat recovery device provided in the bypass passage or the circulation passage and in the inside thereof. Receives heat from stagnant exhaust. For this reason, although the temperature of the heat exchange fluid flowing through the heater core gradually decreases as time elapses, the temperature decrease of the heat exchange fluid is moderated by the heat received from the exhaust heat recovery device and the exhaust inside thereof. . Therefore, when heating the vehicle interior while the internal combustion engine is stopped, the timing at which the temperature of the heat exchange fluid flowing through the heater core becomes less than the determination value can be delayed, and the heat generation of the heat generating means is started and the vehicle interior is The timing to start heating can be delayed. Thereby, when heating the passenger compartment while the internal combustion engine is stopped, it is possible to suppress the consumption of energy for causing the heat generating means to generate heat.

1 is a schematic diagram showing a cooling water circulation path and an air conditioner of an internal combustion engine in an automobile to which the heating device of the first embodiment is applied. The flowchart which shows the execution procedure of the heating in the stop of an internal combustion engine. The time chart which shows transition with respect to time passage of the amount of heat given to a compartment by an air-conditioner or a heater while an internal-combustion engine stops. The schematic diagram which shows the circulating path of the cooling water of the internal combustion engine in the motor vehicle to which the heating apparatus of 2nd Embodiment is applied, and an air conditioner. The flowchart which shows the execution procedure of the heating in the stop of an internal combustion engine. The schematic diagram which shows the other example of the circulation path of the cooling water of an internal combustion engine. The schematic diagram which shows the other example of the circulation path of the cooling water of an internal combustion engine.

[First Embodiment]
DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is embodied in an automobile heating device will be described below with reference to FIGS.

  In the automobile, as shown in FIG. 1, a circulation path 2 is provided for circulating cooling water (heat exchange fluid) for exchanging heat with the engine 1 for cooling the internal combustion engine 1, and the like. An air conditioner 4 that heats the passenger compartment 3 using the heat of the cooling water is also provided.

  The circulation path 2 includes a fluid passage 2a that passes through the internal combustion engine 1, a bypass passage 2b that bypasses the engine 1, and a circulation passage 2c that is connected to the fluid passage 2a and the bypass passage 2b. An electric pump 5 is provided in the circulation path 2 c in the circulation path 2, and the cooling water in the circulation path 2 circulates through the driving of the electric pump 5. When the internal combustion engine 1 is at a high temperature, the engine 1 is cooled through heat exchange between the cooling water that circulates in the circulation path 2 and passes through the fluid passage 2 a and the internal combustion engine 1.

  The circulation path 2 is provided with a control valve 8 that is driven to prohibit the flow of the cooling water in the fluid passage 2a. When the control valve 8 is opened, the flow of the cooling water in the fluid passage 2a is permitted, and the cooling water is circulated in the circulation passage 2 using the fluid passage 2a, the bypass passage 2b, and the circulation passage 2c. On the other hand, when the control valve 8 is closed, the flow of the cooling water in the fluid passage 2a is prohibited, and the circulation of the cooling water in the circulation passage 2 is performed using only the bypass passage 2b and the circulation passage 2c. It should be noted that the temperature of the cooling water circulating in the circulation path 2 is detected on the downstream side of the internal combustion engine 1 serving as a heat source in the circulation path 2, more specifically, the downstream side of the internal combustion engine 1 in the fluid passage 2 a, and this temperature is accommodated. A temperature sensor 9 for outputting a detection signal is provided.

  The air conditioner 4 includes a blower 6 that is driven to send warm air into the passenger compartment 3, and a heater core 7 provided in the middle of the circulation path 2 c in the circulation path 2 through the drive of the blower 6. The air after passing through and exchanging heat with the cooling water in the heater core 7 is sent into the passenger compartment 3. Therefore, when the blower 6 is driven based on the heating request and an air flow is generated, the air passes through the heater core 7 and is heated by the cooling water and then sent to the passenger compartment 3, thereby Heating will be performed. In the vehicle compartment 3, an electrothermal heater 10 that generates heat by energization is provided as a heater for heating the interior of the vehicle compartment 3 by generating heat from a heat source different from that of the internal combustion engine 1. .

  The heating device of the automobile includes an electronic control device 11 that executes various controls relating to the automobile such as operation control of the internal combustion engine 1. The electronic control unit 11 includes a CPU that executes various arithmetic processes related to the above control, a ROM that stores programs and data necessary for the control, a RAM that temporarily stores CPU calculation results, and the like. An input / output port for inputting / outputting signals is provided.

  Various sensors such as the temperature sensor 9 are connected to the input port of the electronic control unit 11. In addition, to the output port of the electronic control unit 11, drive circuits for various devices for driving the internal combustion engine 1 and drive circuits for various devices such as the electric pump 5, the blower 6, the control valve 8, and the heater 10 are connected. Has been. Then, the electronic control unit 11 grasps the operating state of the internal combustion engine 1 and the vehicle based on detection signals from various sensors connected to the input port, and various types connected to the output port according to the grasped operating state. A command signal is output to the drive circuit. In this way, various controls such as operation control of the internal combustion engine 1 and drive control of the electric pump 5, blower 6, control valve 8, and heater 10 are performed through the electronic control device 11.

Next, heating in the passenger compartment 3 when the internal combustion engine 1 is stopped will be described.
When a request for heating is made while the internal combustion engine 1 is stopped, if the temperature of the cooling water in the circulation path 2 is relatively high, such as immediately after completion of the engine stop, the cooling water in the circulation path 2 is driven by driving the electric pump 5. The inside of the passenger compartment 3 is heated by the air conditioner 4 using the heat of the cooling water passing through the heater core 7 while circulating the air. In particular, in a vehicle such as a hybrid vehicle in which the internal combustion engine 1 is frequently stopped and restarted, a situation in which the temperature of the cooling water in the circulation path 2 is relatively high immediately after the engine is stopped is likely to occur. There is a high possibility that heating of the vehicle interior 3 by the above-described air conditioner 4 is performed when a heating request is made while the vehicle is stopped.

  When the interior of the passenger compartment 3 is heated by the air conditioner 4 using the heat of the cooling water passing through the heater core 7 based on the heating request while the internal combustion engine 1 is stopped, the control valve 8 is closed and the fluid passage is closed. The flow of heat exchange fluid in 2a is prohibited. Thereby, the cooling water in the circulation path 2 is circulated only in the bypass passage 2b and the circulation passage 2c, and the circulating cooling water passes through the stopped internal combustion engine 1 and the heat of the cooling water is transferred to the engine 1. Deprivation is suppressed. As a result, it is possible to prevent the circulating cooling water from depriving the internal combustion engine 1 of heat and lowering the temperature. As a result, the heating of the vehicle interior 3 by the air conditioner 4 using the heat of the cooling water passing through the heater core 7. It is possible to suppress a decrease in the heating capacity when performing.

  However, when the interior of the vehicle compartment 3 is heated by the air conditioner 4 as described above while the internal combustion engine 1 is stopped, heat is taken away from the cooling water circulating in the circulation path 2 due to the heating. In any case, the heating capacity for heating the passenger compartment is insufficient for the demand. Thus, in order to prevent the heating capacity when heating the passenger compartment 3 from being insufficient for the demand, the passenger compartment is heated by the heater 10 that generates heat from a heat source different from that of the internal combustion engine 1 while the internal combustion engine 1 is stopped. It is conceivable to perform heating in the interior 3.

  When the heater 10 is used for heating the interior of the passenger compartment 3 while the internal combustion engine 1 is stopped, the passenger compartment 3 is used if possible from the viewpoint of suppressing the consumption of electrical energy necessary for heating the heater 10 as much as possible. It is preferable that the inside heating is performed only by heating using the heat of the cooling water by the air conditioner 4, and the heat generation of the heater 10 is delayed as much as possible. However, in order to achieve such an object, it is necessary to appropriately perform drive control of the air conditioner 4 and drive / stop of the heater 10 based on the temperature of the cooling water passing through the heater core 7.

  Here, when the inside of the passenger compartment 3 is heated while the internal combustion engine 1 is stopped, the heat of the heater 10 is delayed as much as possible based on the temperature of the cooling water detected by the temperature sensor 9. Although it is conceivable to perform drive control and drive / stop of the heater 10, the above purpose cannot be achieved. In other words, even when the drive control of the air conditioner 4 and the drive / stop of the heater 10 are performed as described above, the heater 10 can generate heat when heating the passenger compartment 3 while the internal combustion engine 1 is stopped. As long as you can not delay properly. This is because when the flow of the cooling water in the fluid passage 2a is prohibited by the control valve 8 while the internal combustion engine 1 is stopped, the cooling water is circulated only in the bypass passage 2b and the circulation passage 2c in the circulation passage 2 and the heater core 7 This is because the temperature detected by the temperature sensor 9 does not correspond to the temperature of the coolant circulating through the heater core 7 as described above.

  When the interior of the passenger compartment 3 is heated while the internal combustion engine 1 is stopped, the drive control of the air conditioner 4 and the drive / stop of the heater 10 cannot be performed so as to delay the heat generation of the heater 10 as much as possible. Trouble occurs. That is, the heating of the heater 10 is started at an early timing, in other words, the heating of the heater 10 may be started even though the heating request can be satisfied only by heating the interior of the vehicle compartment 3 by the air conditioner 4. As a result, electric energy for heating the heater 10 is wasted.

  Next, a heating execution procedure for dealing with the above-described problem will be described with reference to a flowchart of FIG. 2 showing a heating routine when the internal combustion engine is stopped. The internal combustion engine stop-time heating routine is periodically executed through the electronic control unit 11 by, for example, a time interruption every predetermined time.

  In this routine, it is determined whether there is a heating request while the internal combustion engine 1 is stopped (S101). The heating request is, for example, instructed to perform air conditioning in the passenger compartment 3 through the operation of the air conditioner 4 by the driver, and the set temperature in the passenger compartment 3 set by the driver (the passenger compartment 3). This is done when the required temperature value is high. When it is determined that there is a heating request while the internal combustion engine 1 is stopped, the interior of the vehicle compartment 3 is heated by the air conditioner 4 (S102). Specifically, the control valve 8 is closed and the electric pump 5 is driven, and the cooling water is circulated in the circulation path 2 only by the bypass passage 2b and the circulation passage 2c. Furthermore, the blower 6 is driven in that state, and the interior of the passenger compartment 3 is heated by the air conditioner 4 using the heat of the cooling water passing through the heater core 7 of the circulation passage 2c.

  Here, when the interior of the passenger compartment 3 is heated by the air conditioner 4 while the internal combustion engine 1 is stopped, the heat of the cooling water circulating in the circulation path 2 is deprived due to the heating and the cooling water is removed. The temperature gradually decreases. Note that the temperature of the cooling water passing through the heater core 7 in the circulation passage 2 c is a value corresponding to the amount of heat given to the vehicle interior 3. For this reason, the amount of heat given to the passenger compartment 3 from the coolant passing through the heater core 7 is equal to the temperature of the coolant when the air conditioner 4 is heated while the internal combustion engine 1 is stopped. For example, as indicated by the solid line L1 in FIG. 3, the value gradually decreases with time and approaches the minimum value MIN that can satisfy the heating requirement in the passenger compartment 3.

  The minimum value MIN is a minimum value capable of maintaining the temperature in the passenger compartment 3 at a required value by the amount of heat given to the passenger compartment 3 from the cooling water passing through the heater core 7, This value is variable according to the set temperature and the like set by the driver. This minimum value MIN tends to increase as the set temperature increases. Then, during the time until the amount of heat given from the cooling water passing through the heater core 7 to the minimum value MIN (timing T1 to T2), the heat of the cooling water passing through the heater core 7 is used. Only the heating by the air conditioner 4 makes it possible to maintain the temperature in the passenger compartment 3 at the required value. On the other hand, when the amount of heat becomes less than the minimum value MIN (after T2), the temperature in the passenger compartment 3 cannot be maintained at the required value only by heating by the air conditioner 4.

  Therefore, when the amount of heat is reduced to the minimum value MIN (timing T2), the heater 10 is driven to generate heat, so that the heater 10 can start to generate heat while maintaining the temperature in the passenger compartment 3 at the required value. As much as possible, the consumption of electric energy necessary for the heat generation of the heater 10 is suppressed as much as possible. Steps S103 to S105 in the internal combustion engine stop heating routine of FIG. 4 are processes for realizing the start of heat generation of the heater 10 at the above-described timing T2.

  In this series of processing, first, from the detection signal from the temperature sensor 9 at the time of closing of the control valve 8 accompanying the heating of the passenger compartment 3 while the internal combustion engine 1 is stopped, and from the time of closing of the control valve 8. Based on the elapsed time, the temperature Tw of the cooling water passing through the heater core 7 is estimated (S103). The cooling water temperature Tw obtained in this way becomes a lower value as the detection signal from the temperature sensor 9 at the time of closing the control valve 8 is a value closer to a low temperature, and gradually decreases as the elapsed time increases. It also becomes. Thereafter, it is determined whether or not the temperature Tw of the cooling water is lower than a determination value H (S104). This determination value H is set to a value corresponding to the minimum value MIN. In other words, the determination value H cannot maintain the temperature in the vehicle compartment 3 at the required value only by heating the vehicle interior 3 by the air conditioner 4 using the heat of the cooling water passing through the heater core 7. The maximum value of the temperature range of the cooling water is set. Note that the determination value H is a value that is variable according to the set temperature set by the driver in the same manner as the minimum value MIN, and tends to become a large value as the minimum value MIN increases.

  If it is determined in step S104 that the temperature Tw of the cooling water is equal to or higher than the determination value H, the heater 10 is stopped and the heater 10 does not generate heat (S108). Is determined to be less than the determination value H, the heater 10 is driven and heat generation of the heater 10 is started (S105). Therefore, in FIG. 3, when the amount of heat given from the cooling water passing through the heater core 7 to the vehicle interior 3 is reduced to the minimum value MIN (T2 in FIG. 3), in other words, the temperature Tw of the cooling water is less than the determination value H. Then, the heat generation of the heater 10 is started, and the amount of heat given to the vehicle compartment 3 by the heat generation of the heater 10 is set to a value larger than “0” as shown by the solid line L2 in FIG. Thus, by heating the heater 10 and heating the inside of the vehicle compartment 3 by the heater 10, the temperature in the vehicle compartment 3 can be maintained at the required value.

  On the other hand, if a negative determination is made in step S101 (FIG. 2), it is determined whether the internal combustion engine 1 is stopped and there is no heating request (S106). If the determination is affirmative, heating of the vehicle interior 3 by the air conditioner 4 using the heat of the cooling water passing through the heater core 7 is stopped (S107), and further, the interior of the vehicle interior 3 due to the heat generated by the heater 10 is stopped. Heating is also stopped (S108).

According to the embodiment described in detail above, the following effects can be obtained.
(1) When a request for heating in the passenger compartment 3 is made while the internal combustion engine 1 is stopped, the interior of the passenger compartment 3 by the air conditioner 4 using the heat of the cooling water flowing through the heater core 7 provided in the bypass passage 2b is used. When heating is performed, the control valve 8 prohibits the flow of cooling water in the fluid passage 2a of the circulation path 2, and the cooling water is circulated only by the bypass passage 2b and the circulation path 2c of the circulation path 2. Is called. Further, when a heating request is made in the passenger compartment 3 while the internal combustion engine 1 is stopped, the temperature Tw of the cooling water flowing through the heater core 7 is obtained. Specifically, a temperature sensor at the time when the control valve 8 is closed (at the time when the control valve 8 prohibits the flow of cooling water in the fluid passage 2a) due to heating in the passenger compartment 3 while the internal combustion engine 1 is stopped. The temperature Tw of the cooling water flowing through the heater core 7 is estimated and obtained as an appropriate value based on the detection signal from 9 and the passage of time from the time when the control valve 8 is closed. And based on the temperature Tw of the cooling water calculated | required as mentioned above, in order to heat the interior of the vehicle interior 3 by the said air conditioner 4, and the interior of the vehicle interior 3 using a heat source different from the internal combustion engine 1 Heat generation of the heater 10 that generates heat is performed.

  Accordingly, the heater core 3 is heated while the internal combustion engine 1 is stopped only by heating using the heat of the cooling water by the air conditioner 4 as much as possible, and the start of heat generation of the heater 10 is delayed as much as possible. On the basis of the temperature Tw of the cooling water passing through 7, it becomes possible to appropriately perform drive control of the air conditioner 4 and drive / stop of the heater 10. If drive control of the air conditioner 4 and drive / stop of the heater 10 cannot be appropriately performed, the heater 10 may start to generate heat at an early timing. In other words, although the heating request can be satisfied only by heating the passenger compartment 3 by the air conditioner 4, the heater 10 may start to generate heat. In this case, as the heater 10 starts to generate heat at a too early timing as described above, electric energy for generating heat from the heater 10 is wasted. It is possible to suppress the occurrence of such a problem, that is, the unnecessary consumption of electric energy for heating the interior of the passenger compartment 3 while the internal combustion engine 1 is stopped.

  (2) When the control valve 8 is opened and the flow of the cooling water in the fluid passage 2a is not prohibited by the control valve 8, the cooling water in the circulation path 2 is transferred to the fluid passage 2a and the bypass passage. Since it circulates using 2b and the circulation channel | path 2c, the temperature of the cooling water detected by the said temperature sensor 9 becomes substantially equal to the temperature of the cooling water which passes the heater core 7. FIG. And if the flow of the cooling water in the fluid passage 2a is prohibited by closing the control valve 8 with the heating in the passenger compartment 3 while the internal combustion engine 1 is stopped, the heater core 7 is passed from the prohibition time. The temperature of the cooling water gradually decreases, which is inconsistent with the temperature of the cooling water detected by the temperature sensor 9. In consideration of this, when the control valve 8 is closed along with the heating of the passenger compartment while the internal combustion engine 1 is stopped, the detection signal from the temperature sensor 9 at the closing time and the closing time The temperature Tw of the cooling water flowing through the heater core 7 is estimated based on the elapsed time from. Thereby, when heating the passenger compartment 3 while the internal combustion engine 1 is stopped, the temperature Tw of the cooling water flowing through the heater core 7 can be determined appropriately.

  (3) When the interior of the passenger compartment 3 is heated while the internal combustion engine 1 is stopped, the temperature Tw of the cooling water flowing through the heater core 7 is the determination value H, that is, the passenger compartment 3 by the air conditioner 4 using the heat of the coolant. The heating in the passenger compartment 3 due to the heat generated by the heater 10 is stopped until the temperature in the passenger compartment 3 is lowered to the maximum value in the temperature range in which the temperature in the passenger compartment 3 cannot be maintained at the required value only by the internal heating. At this time, the temperature in the passenger compartment 3 is maintained at the required value only by heating the passenger compartment 3 by the air conditioner 4 using the heat of the cooling water flowing through the heater core 7. Then, after the temperature Tw of the cooling water flowing through the heater core 7 becomes less than the determination value H, the heater 10 starts to generate heat, and the vehicle interior 3 is heated by the generated heat. Therefore, the heating in the passenger compartment 3 due to the heat generated by the heater 10 can maintain the temperature in the passenger compartment 3 at the required value only by the heating in the passenger compartment 3 by the air conditioner 4 using the heat of the cooling water flowing through the heater core 7. It is done after it can no longer be done. This means that the heating in the passenger compartment 3 due to the heat generated by the heater 10 is required to maintain the temperature in the passenger compartment 3 at the required value, and then the heating is performed. As described above, when the interior of the passenger compartment 3 is heated while the internal combustion engine 1 is stopped, it is possible to accurately suppress wasteful consumption of electric energy for heating the heater 10.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
In this embodiment, as shown in FIG. 4, a temperature sensor 12 that detects the temperature of the cooling water and outputs a detection signal corresponding to the temperature is provided on the upstream side of the heater core 7 in the circulation passage 2c. Instead of estimating the temperature Tw of the passing cooling water as in the first embodiment, it is obtained based on the detection signal from the temperature sensor 12.

  FIG. 5 is a flowchart showing the internal combustion engine stop heating routine in this embodiment. This internal combustion engine stop heating routine differs from the internal combustion engine stop heating routine (FIG. 2) in the first embodiment only in a process (S203) corresponding to step S103 of the routine.

  In the internal combustion engine stop-time heating routine of this embodiment, when it is determined that there is a heating request while the internal combustion engine 1 is stopped (S201: YES), the air-conditioner 4 performs heating in the passenger compartment 3 (S202). ). Further, the temperature sensor 12 detects the temperature Tw of the cooling water flowing through the heater core 7 in a state where the cooling water in the circulation path 2 is circulated only in the bypass path 2b and the circulation path 2c.

  Thereafter, it is determined whether or not the temperature Tw of the cooling water is lower than a determination value H (S204). If it is determined in step S104 that the temperature Tw of the cooling water is equal to or higher than the determination value H, the heater 10 is stopped and the heater 10 does not generate heat (S208). When it is determined that Tw is less than the determination value H, the heater 10 is driven and heat generation of the heater 10 is started (S205).

  On the other hand, if a negative determination is made in step S201, it is determined whether the internal combustion engine 1 is stopped and there is no heating request (S206). If the determination is affirmative, heating of the vehicle interior 3 by the air conditioner 4 using the heat of the cooling water passing through the heater core 7 is stopped (S207), and further, the interior of the vehicle interior 3 due to the heat generated by the heater 10 is stopped. Heating is also stopped (S208).

According to this embodiment, the following effects can be obtained.
(3) When heating the passenger compartment 3 while the internal combustion engine 1 is stopped, the temperature of the cooling water flowing through the heater core 7 is detected by the temperature sensor 12, and a signal corresponding to the temperature of the cooling water is detected from the temperature sensor 12. Is output. Based on the detection signal from the temperature sensor 12, the temperature Tw of the cooling water flowing through the heater core 7 is obtained. Thereby, when heating the passenger compartment 3 while the internal combustion engine 1 is stopped, the temperature Tw of the cooling water flowing through the heater core 7 can be determined appropriately.

[Other Embodiments]
Each said embodiment can also be changed as follows, for example.
In the first embodiment, as shown in FIG. 6, an exhaust heat recovery device 13 may be provided in the bypass passage 2b. In the second embodiment, as shown in FIG. 7, an exhaust heat recovery device 13 may be provided in the bypass passage 2b. The exhaust heat recovery unit 13 heats the cooling water flowing in the bypass passage 2b by using the heat of the exhaust gas of the internal combustion engine 1, more specifically, heats the cooling water by exchanging heat with the exhaust gas. To do.

  In these cases, when the cooling water is circulated in the bypass passage 2b and the circulation passage 2c in the circulation path 2 for heating the inside of the passenger compartment 3 by the air conditioner 4 after the stop of the internal combustion engine 1, the cooling water is bypassed. Heat is received from the exhaust heat recovery device 13 of 2b and the exhaust gas staying in it. For this reason, although the temperature Tw of the cooling water flowing through the heater core 7 gradually decreases with the heating, the temperature decrease of the cooling water is caused by the heat received from the exhaust heat recovery device 13 and the exhaust inside thereof. Depending on the mode. When the exhaust heat recovery device 13 is applied to the first embodiment, when the temperature Tw of the cooling water is estimated and obtained, the temperature is also taken into account by receiving heat from the exhaust heat recovery device 13 to the cooling water. Tw is estimated.

  Therefore, by providing the exhaust heat recovery device 13, when the inside of the passenger compartment 3 is heated while the internal combustion engine 1 is stopped, the timing at which the temperature Tw of the cooling water flowing through the heater core 7 becomes less than the determination value H is delayed. It is possible to delay the timing at which the heater 10 starts to generate heat and starts heating the interior of the passenger compartment 3 due to the generated heat. Thereby, when heating the interior of the passenger compartment 3 while the internal combustion engine 1 is stopped, it is possible to suppress consumption of electric energy for causing the heater 10 to generate heat.

The exhaust heat recovery device 13 may be provided in the circulation passage 2c instead of being provided in the bypass passage 2b.
In the first and second embodiments, the heater 10 is not limited to the one that warms the air in the passenger compartment 3, but may be one that warms a seat, a steering wheel, or the like that contacts the driver.

  Although a hybrid vehicle has been exemplified as a vehicle to which the present invention is applied, the present invention is applied to a vehicle that includes only the internal combustion engine 1 as a prime mover and automatically stops and restarts the engine 1 according to the running state. You can also.

  DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Circulation path, 2a ... Fluid path, 2b ... Bypass path, 2c ... Circulation path, 3 ... Car compartment, 4 ... Air conditioner, 5 ... Electric pump, 6 ... Blower, 7 ... Heater core, 8 ... Control valve, 9 ... temperature sensor, 10 ... heater (heat generating means), 11 ... electronic control device (temperature determining means, control means), 12 ... temperature sensor, 13 ... exhaust heat recovery device.

Claims (5)

A fluid passage that passes through the internal combustion engine, a bypass passage that bypasses the engine, a circulation passage that is connected to the fluid passage and the bypass passage, and in which the heat exchange fluid circulates; and the circulation passage An air conditioner that heats the vehicle interior using heat of a heat exchange fluid that flows through a provided heater core, and a control valve that is driven to prohibit the flow of the heat exchange fluid in the fluid passage. When heating of the passenger compartment is requested while the engine is stopped, the control valve prohibits the flow of heat exchange fluid in the fluid passage in the circulation path, and exchanges heat in the bypass passage and the circulation passage in the circulation path. In a vehicle heating apparatus that circulates fluid and heats a vehicle interior by the air conditioner using heat of a heat exchange fluid flowing through the heater core,
Heating means for generating heat to heat the passenger compartment using a heat source different from the internal combustion engine;
Temperature determining means for determining the temperature of the heat exchange fluid flowing through the heater core when heating the passenger compartment while the internal combustion engine is stopped;
Control for controlling heating of the passenger compartment by the air conditioner and heating of the passenger compartment by the heat generating means based on the temperature obtained by the temperature determination means when a heating request is made while the internal combustion engine is stopped. Means,
A vehicle heating apparatus comprising: The fluid passage is provided with a temperature sensor that detects the temperature of the heat exchange fluid flowing through the passage and outputs a detection signal corresponding to the temperature.
The temperature determination means is configured to exchange heat through the heater core based on a detection signal from the temperature sensor at a time point when the flow of heat exchange fluid in the fluid passage by the control valve is prohibited, and an elapsed time from the time point when the heat control fluid flows. The vehicle heating device according to claim 1, wherein the temperature of the fluid is estimated and obtained. The circulation passage is provided with a temperature sensor that detects the temperature of the heat exchange fluid flowing through the heater core and outputs a detection signal corresponding to the temperature.
The heating device for a vehicle according to claim 1, wherein the temperature determination means obtains a temperature of a heat exchange fluid flowing through the heater core based on a detection signal from the temperature sensor. While the internal combustion engine is stopped, the control means stops heating the vehicle interior due to heat generated by the heat generating means until the temperature of the heat exchange fluid flowing through the heater core determined by the temperature determining means decreases to a determination value. Heating of the vehicle interior using heat of the heat exchange fluid passing through the heater core by the air conditioner is performed, and when the temperature of the heat exchange fluid flowing through the heater core becomes less than the determination value, the heat generation unit starts to generate heat. Heating the passenger compartment with the same heat,
The determination value is set to a maximum value in a temperature range in which the passenger compartment cannot be maintained at a required temperature only by heating the passenger compartment using heat of a heat exchange fluid passing through the heater core by the air conditioner. The vehicle heating device according to any one of claims 1 to 3. The vehicle heating apparatus according to claim 4, wherein the bypass passage or the circulation passage is provided with an exhaust heat recovery device that heats a heat exchange fluid flowing in the bypass passage using heat of exhaust gas of the internal combustion engine. .

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