JP2010012923A - Heating device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating device for a vehicle capable of utilizing heat of cooling water of an engine for heating efficiently. <P>SOLUTION: The heating device for the vehicle is provided with a first cooling water passage 2 for circulating the cooling water to a radiator 10, a bypassing passage 3 for detouring the radiator, a second cooling water passage 4 for circulating the cooling water to a heater core 20 in a vehicle compartment and a cooling function limiting means 12 for limiting a cooling function of the cooling water by the radiator. A control means 50 limits the cooling function of the cooling water in the radiator by the cooling function limiting means if an interior temperature around an occupant in the vehicle compartment is lower than a predetermined temperature. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle heating device, and more particularly to a technique for heating a passenger compartment by using heat of engine coolant that has been heated.

In the vehicle, the cooling water heated by circulating the engine cooling water to the radiator is cooled by the traveling wind of the vehicle, and the engine temperature is maintained at a predetermined temperature by the cooled cooling water.
However, when the outside air temperature is low and the engine needs to be warmed up, there is a problem that circulating the cooling water to the radiator does not promote the warming up of the engine. Normally, cooling near the cooling water inlet or outlet of the radiator is not possible. The water passage is provided with a thermostat valve that switches the communication of the coolant to and from the radiator according to the coolant temperature, and a bypass path that bypasses the radiator is provided. After the engine is started, the coolant temperature is a predetermined high temperature (for example, Until the temperature reaches 80 ° C., the thermostat valve blocks communication with the radiator and allows the cooling water to flow through the bypass.

Further, the vehicle is equipped with a vehicle heating device. Generally, the vehicle heating device divides the cooling water from the engine, circulates it to the heater core arranged in the vehicle interior, and blows air to the heater core. Heat exchange between the heat of the cooling water and the air in the vehicle interior is performed, and the vehicle interior is heated by blowing out warm air that has been heat-exchanged and heated up from the duct.
However, in this way, the cooling water passage has a thermostat valve for communicating and shutting off the cooling water to the radiator, and the vehicle heating device is configured to perform heating using the heat of the engine cooling water. When the cooling water temperature reaches a predetermined high temperature and the thermostat valve allows the cooling water to communicate with the radiator, the cooling water will be cooled by the traveling wind of the vehicle, and the heat of the cooling water is There is a problem that it cannot be used enough for heating. That is, even when the temperature of the passenger compartment is low and it is desired to use the heat of the cooling water for heating as much as possible in the winter season or the like, the heat of the cooling water is wasted in the atmosphere due to the heat radiation of the radiator, which is not preferable.

In such a case, it is only necessary to prevent the cooling water from being cooled by the radiator. For example, a shutter that can be opened and closed is provided in front of the radiator, and the shutter is closed and controlled according to the cooling water temperature or the warm air blowing temperature. There is known an apparatus designed to cut off the traveling wind that hits (see Patent Document 1, etc.).
JP 2006-44588 A

  By the way, in the apparatus disclosed in Patent Document 1, the shutter is controlled to be closed according to the cooling water temperature. In such a configuration, for example, when the temperature at which the shutter is controlled to be closed is set low, Even if the temperature in the passenger compartment is not sufficiently high, cooling of the cooling water is started by the radiator.For example, even if the temperature in the passenger compartment is extremely low in winter, the passenger compartment is kept at an appropriate temperature. There is a problem in that it cannot be heated rapidly until it is inefficient.

This problem is also true when the shutter is controlled to close according to the warm air blowing temperature. Even if the blowing temperature is high, the temperature in the passenger compartment may not be sufficiently high, and in this case, cooling is performed by the radiator. Once the water cooling is started, there is still a problem that the vehicle interior cannot be rapidly heated to an appropriate temperature and the efficiency is poor.
This invention is made | formed in view of such a subject, and it aims at providing the heating apparatus for vehicles which can utilize the heat of the cooling water of an engine efficiently for heating.

  In order to achieve the above object, a vehicle heating apparatus according to claim 1 includes a radiator for cooling engine cooling water, a first cooling water passage for circulating cooling water through the radiator, and the first cooling water. Provided at a branch or junction between a bypass passage that bypasses the radiator and the first cooling water passage of the bypass passage, and is provided so as to branch and join the passage. A thermostat valve that blocks communication of the water to the radiator while allowing the water to communicate with the radiator when the water temperature exceeds the predetermined temperature; cooling function limiting means for limiting a cooling function of cooling water by the radiator; And a second cooling water passage that circulates the cooling water to the heater core in the vehicle interior, and an internal air temperature detection that detects the internal air temperature in the vicinity of the passenger in the vehicle interior. And control means for controlling the cooling function restriction means, the control means being configured to control the cooling water in the radiator by the cooling function restriction means when the inside air temperature detected by the inside air temperature detection means is less than a predetermined temperature. The cooling function is limited, and the limitation is released when the temperature is higher than the predetermined temperature.

  According to a second aspect of the present invention, there is provided the vehicle heating apparatus according to the first aspect, further comprising cooling water temperature detecting means for detecting a temperature of the cooling water, wherein the cooling function limiting means is the thermostat valve, and the control means is the cooling means. When the temperature of the cooling water detected by the water temperature detecting means is lower than the predetermined water temperature, the communication of the cooling water to the radiator is interrupted, and when the temperature is equal to or higher than the predetermined water temperature, the internal air temperature detected by the internal air temperature detecting means is less than the predetermined air temperature. Then, the thermostat valve is closed and controlled to open when the internal temperature becomes a predetermined temperature or higher.

  According to a third aspect of the present invention, there is provided a heating apparatus for a vehicle according to the first aspect, wherein the thermostat valve is configured to always communicate with the bypass passage, and the cooling function restricting means is provided on the radiator side of the first cooling water passage. An opening / closing valve interposed in a portion, wherein the control means closes the opening / closing valve when the internal temperature detected by the internal temperature detection means is less than a predetermined temperature, and opens when the internal temperature is equal to or higher than the predetermined temperature. It is characterized by doing.

According to a fourth aspect of the present invention, there is provided a heating apparatus for a vehicle according to the first aspect, wherein the cooling function restricting means is a shutter that blocks ventilation to the radiator, and the control means is an internal air temperature detected by the internal air temperature detecting means. When the temperature is lower than a predetermined temperature, the shutter is controlled to be closed, and when the internal temperature is equal to or higher than the predetermined temperature, the shutter is controlled to be opened.
According to a fifth aspect of the present invention, there is provided the vehicle heating apparatus according to any one of the first to fourth aspects, further comprising a cooling water temperature detecting means for detecting a temperature of the cooling water, wherein the control means detects the cooling water detected by the cooling water temperature detecting means. When the temperature reaches a specified water temperature higher than the predetermined water temperature, the restriction of the cooling function of the cooling water in the radiator by the cooling function restriction means is canceled regardless of the inside air temperature detected by the inside air temperature detection means. It is characterized by.

  According to the vehicle heating device of claim 1, when the coolant temperature of the engine becomes equal to or higher than the predetermined coolant temperature, the thermostat valve allows communication with the radiator and circulates through the first coolant passage so that the radiator is circulated. On the other hand, the heat of the cooling water is circulated through the second cooling water passage and used for heating the vehicle interior via the heater core. When the inside air temperature is lower than the predetermined temperature, the cooling function limiting means restricts the cooling function of the cooling water in the radiator, and when the temperature exceeds the predetermined temperature, the restriction is released.

  In other words, until the inside air temperature in the passenger compartment reaches a predetermined temperature, the cooling function cooling means restricts the cooling function of the cooling water in the radiator even if communication with the radiator is allowed. During this time, depending on the radiator, The water is hardly cooled, and the heat of the cooling water, which is normally dissipated by the radiator and discarded, is effectively used for heating the passenger compartment through the heater core.

Therefore, the heat of the engine cooling water can be efficiently used for heating, and the vehicle interior is rapidly heated to an appropriate temperature even when the outside air temperature is extremely low and the interior temperature is extremely low in winter. be able to.
According to the vehicle heating device of the second aspect, the cooling function limiting means is a thermostat valve. When the temperature of the cooling water is lower than the predetermined water temperature, the communication of the cooling water with the radiator is interrupted. The thermostat valve is closed when the internal temperature detected by the detecting means is lower than the predetermined temperature, and is opened when the internal temperature is equal to or higher than the predetermined temperature.

As a result, the cooling function limiting means can be easily realized with a simple configuration while sharing the function of the original thermostat valve.
According to the vehicle heating device of claim 3, in the case where the thermostat valve has a structure in which the bypass passage is always in communication, the cooling function limiting means is an on-off valve interposed in the first radiator side portion, The on-off valve is closed when the internal temperature detected by the internal temperature detecting means is less than the predetermined temperature, and is opened when the internal temperature is equal to or higher than the predetermined temperature.

As a result, the cooling function limiting means can be easily realized with a simple configuration in which an open / close valve is provided without changing the existing thermostat valve that is frequently used.
According to the vehicle heating device of the fourth aspect, the cooling function limiting means is a shutter that blocks ventilation to the radiator, and the shutter is closed when the internal air temperature detected by the internal air temperature detecting means is less than a predetermined temperature, Open control is performed when the temperature exceeds a predetermined temperature.

As a result, the cooling function limiting means can be easily realized with a simple configuration of providing a shutter that blocks ventilation to the radiator.
According to the vehicle heating device of claim 5, when the temperature of the cooling water reaches a specified water temperature higher than the predetermined water temperature, the restriction of the cooling function of the cooling water in the radiator by the cooling function restriction means is canceled regardless of the inside air temperature. Is done.

  Therefore, even when the cooling function of the cooling water in the radiator is limited by the cooling function limiting means, it is possible to prevent an excessive increase in the temperature of the cooling water.

Embodiments of the present invention will be described below with reference to the drawings.
First, the first embodiment will be described.
Referring to FIG. 1, there is shown a schematic configuration diagram of a vehicle heating apparatus according to a first embodiment of the present invention.
As shown in the figure, the vehicle heating apparatus according to the first embodiment is configured to include a cooling water circuit that is mounted on a vehicle and circulates the cooling water of the engine 1. A radiator circuit (first cooling water passage) 2 provided with a radiator 10 and a heater circuit (second cooling water passage) 4 provided with a heater core 20 branched and joined from the radiator circuit 2 It is configured.

The radiator 10 is provided, for example, at the front portion of the vehicle so as to receive a large amount of traveling wind, and the heater core 20 is part of the vehicle air conditioner in a blowout duct 30 of, for example, a dashboard air conditioner in the passenger compartment. It is arranged as.
Specifically, the blow-out duct 30 in which the heater core 20 is disposed includes an air mix door 34 that variably operates a mixing ratio of cold air and warm air by the heater core 20 in addition to a fan 32 that blows air as illustrated. Thus, the temperature in the passenger compartment (hereinafter referred to as the inside air temperature) is appropriately adjusted. However, control of the fan 32 and the air mix door 34 is publicly known, and a description thereof is omitted here.

The radiator circuit 2 is provided with a bypass passage 3 that branches and joins to bypass the radiator 10. A junction of the bypass passage 3 with the radiator circuit 2 mainly has a cooling water radiator according to the temperature of the cooling water. A thermostat valve (cooling function restricting means) 12 for controlling communication and shut-off to 10 is provided.
The thermostat valve 12 is, for example, an electromagnetic on-off valve, and is electrically connected to an output terminal of an electronic control unit (ECU) 50.

Here, the thermostat valve 12 is such that the bypass passage 3 is always in communication and only switching between communication and blocking of the radiator 10 side portion of the radiator circuit 2 is employed. However, the present invention is not limited to this. The flow path may be completely switched between the radiator 10 side portion of the radiator circuit 2 and the bypass passage 3.
The radiator circuit 2 is provided with a water temperature sensor (cooling water temperature detecting means) 14 that is located downstream of the thermostat valve 12 and detects the temperature of the cooling water. The water temperature sensor 14 is electrically connected to an input terminal of the ECU 50. Connected.

Thus, when the water temperature information from the water temperature sensor 14 is input to the ECU 50, the thermostat valve 12 is appropriately controlled to open and close by the ECU 50 based mainly on the water temperature information.
On the other hand, the heater circuit 4 is provided with a shut-off valve 22 that is located upstream of the heater core 20 and communicates and shuts off the cooling water to the heater core 20. The shutoff valve 22 is also electrically connected to the input terminal of the ECU 50.

A water pump 18 for circulating the cooling water to the radiator circuit 2 and the heater circuit 4 is provided at the junction between the radiator circuit 2 and the heater circuit 4.
Further, an inside air temperature sensor (inside air temperature detecting means) 52 is provided in the passenger compartment so as to be able to detect the ambient temperature in the vicinity of the passenger, and the inside air temperature sensor 52 is electrically connected to an input terminal of the ECU 50. Has been. Here, the inside air temperature sensor 52 is installed, for example, on the inner surface of the roof in the passenger compartment. However, the installation position is not limited to this, as long as it is in the vicinity of an occupant separated from the outlet of the outlet duct 30.

Hereinafter, the control contents of the vehicle heating apparatus according to the first embodiment of the present invention configured as described above will be described.
Referring to FIG. 2, a control routine of the thermostat valve 12 executed by the ECU 50 when the engine 1 is started is shown in a flowchart (control means), and will be described along the flowchart.

  In step S10, first, immediately after the engine 1 is started, the thermostat valve 12 is closed. When the thermostat valve 12 is controlled to be closed in this way, the cooling water of the engine 1 flows only through the bypass passage 3 in the radiator circuit 2 and does not flow into the radiator 10, so that it is not cooled by the radiator 10, that is, the radiator. The cooling function of the cooling water at 10 is limited, and the temperature is quickly raised by the heat generated by the engine 1. And the cooling water heated up in this way circulates through the heater circuit 4, and raises the temperature of the heater core 20. Thereby, the air heat-exchanged with the heater core 20 is suitably blown out from the blowing duct 30 into the vehicle interior, and the vehicle interior is heated.

  In step S12, based on the information from the water temperature sensor 14, the coolant temperature is read into the ECU 50. In step S14, it is determined whether or not the cooling water temperature is equal to or higher than a specified water temperature (for example, 100 ° C.). Here, the specified water temperature is, for example, a temperature slightly lower than the boiling point of the cooling water and a temperature higher than a predetermined water temperature (for example, 80 ° C.) described later. Normally, if the engine 1 is not warmed up, the cooling water temperature is less than the specified water temperature immediately after starting, and therefore the determination result is false (No), and in this case, the process proceeds to step S16.

  In step S <b> 16, based on the inside air temperature information from the inside air temperature sensor 52, the inside air temperature in the vehicle compartment is read into the ECU 50. In step S18, it is determined whether or not the inside air temperature in the passenger compartment has reached a predetermined air temperature (for example, a set temperature of the air conditioner). For example, when the inside air temperature in the passenger compartment is extremely low in winter or the like, the determination result is false (No), and the process returns to step S12.

That is, here, the thermostat valve 12 is kept closed until the inside air temperature in the passenger compartment reaches a predetermined temperature or higher, and the cooling function of the cooling water in the radiator 10 is continuously limited. Thereby, the temperature of the cooling water is sufficiently increased, the heater core 20 is sufficiently heated, and the vehicle interior is rapidly heated.
When the determination result of step S18 is true (Yes) and it is determined that the inside air temperature of the vehicle interior has reached the predetermined temperature, the process proceeds to step S20, and the thermostat valve 12 is controlled to open. That is, when the passenger compartment is sufficiently heated, it is not necessary to further heat the heater core 20, and the thermostat valve 12 is controlled to be opened so that the cooling water flows to the radiator 10.

  Moreover, also when it is determined that the determination result in step S14 is true (Yes) and the cooling water temperature is equal to or higher than a specified water temperature (for example, 100 ° C.), the process proceeds to step S20, and the thermostat valve 12 is controlled to open. That is, if the cooling water temperature exceeds the specified water temperature, the cooling water may overheat, for example, the cooling water may boil and the engine 1 may not be sufficiently cooled, so the cooling water temperature is determined to be equal to or higher than the specified water temperature. In such a case, the thermostat valve 12 is controlled to open so that the cooling water flows to the radiator 10 regardless of the inside air temperature in the passenger compartment. Thereby, the excessive temperature rise of cooling water can be prevented.

  After opening control of the thermostat valve 12, in step S22, the thermostat valve 12 is controlled to open and close so that the coolant temperature detected by the water temperature sensor 14 is maintained at a predetermined water temperature (for example, 80 ° C.). The control for maintaining the cooling water temperature at a predetermined water temperature is executed as a normal cooling water control in a separate routine (not shown). Thereby, the temperature of the engine 1 is kept moderate thereafter.

Thus, in the vehicle heating apparatus according to the first embodiment of the present invention, the cooling water in the radiator 10 is controlled by closing the thermostat valve 12 when the inside air temperature detected by the inside air temperature sensor 52 is lower than the predetermined temperature. The cooling function is restricted, and when the temperature is higher than the predetermined temperature, the thermostat valve 12 is controlled to be opened to release the restriction.
Thus, the cooling water is hardly cooled by the radiator 10 until the inside air temperature in the passenger compartment reaches a predetermined temperature. Normally, the heat of the cooling water that has been radiated and discarded by the radiator 10 passes through the heater core 20. It is effectively used for heating the passenger compartment.

Therefore, the heat of the cooling water of the engine 1 can be efficiently used for heating, and the interior of the passenger compartment can be rapidly brought to an appropriate temperature even in the winter when the outside air temperature is extremely low and the inside air temperature in the passenger compartment is extremely low. Can be heated.
In particular, in the first embodiment, the thermostat valve 12 is used as the cooling function restricting means, and the cooling function restricting means is easily realized with a simple configuration while sharing the function of the original thermostat valve. be able to.

Moreover, since the thermostat valve 12 is controlled to open regardless of the inside air temperature in the passenger compartment when the cooling water temperature is equal to or higher than a specified water temperature (for example, 100 ° C.), it is possible to prevent an excessive increase in the temperature of the cooling water.
Next, a second embodiment will be described.
Referring to FIG. 3, there is shown a schematic configuration diagram of a vehicle heating apparatus according to a second embodiment of the present invention.

The second embodiment is different from the first embodiment in that an open / close valve (cooling function limiting means) 13 is provided between the thermostat valve 12 'of the radiator circuit 2 and the radiator 10. Therefore, the description of the common parts with the first embodiment will be omitted, and only the different parts will be described.
The thermostat valve 12 'is such that, as with the thermostat valve 12 of the first embodiment, the bypass passage 3 is always in communication and only the communication of the portion on the radiator 10 side of the radiator circuit 2 is switched. Unlike the thermostat valve 12, the thermostat valve 12 is configured as a normal thermostat valve (for example, wax type) having only an original function of opening the cooling water at a predetermined water temperature (for example, 80 ° C.).

On the other hand, the on-off valve 13 is configured as an electromagnetic on-off valve, for example, and is electrically connected to an output terminal of an electronic control unit (ECU) 50.
The vehicle heating apparatus according to the second embodiment of the present invention configured as described above is controlled according to the control routine of the on-off valve 13 shown in the flowchart of FIG. In the flowchart, the “thermostat valve” in step S10 and step S20 is replaced with the “open / close valve” in step S10 ′ and step S20 ′ in the flowchart of FIG. 2 of the first embodiment, and there is no step S22. The description of the common parts is omitted.

  That is, in the second embodiment, after the on-off valve 13 is controlled to be closed in step S10 ′, the inside air temperature in the vehicle compartment has not yet reached a predetermined air temperature (for example, the set temperature of the air conditioner) as determined in step S18. If it is determined, as in the case of the first embodiment, the on-off valve 13 is kept closed until the inside air temperature in the passenger compartment becomes equal to or higher than the predetermined temperature. As a result, the cooling water flows only through the bypass passage 3 and does not flow to the radiator 10, the temperature of the cooling water is sufficiently increased, the heater core 20 is sufficiently heated, and the vehicle interior is rapidly heated.

  On the other hand, if it is determined in step S18 that the inside air temperature in the passenger compartment has reached the predetermined temperature, the process proceeds to step S20 ', and the on-off valve 13 is controlled to open. That is, when the passenger compartment is sufficiently heated, it is not necessary to further heat the heater core 20, and as in the case of the first embodiment, the on-off valve 13 is controlled to be opened so that the cooling water flows to the radiator 10. To. Thereby, thereafter, the temperature of the engine 1 is kept moderate by the function of the thermostat valve 12 '.

As described above, in the vehicle heating apparatus according to the second embodiment of the present invention, when the inside air temperature detected by the inside air temperature sensor 52 is less than the predetermined air temperature, the on-off valve 13 is controlled to be closed and the cooling water in the radiator 10 is controlled. The cooling function is limited, and when the temperature exceeds the predetermined temperature, the opening / closing valve 13 is controlled to be released to release the limitation.
Thus, as in the case of the first embodiment, the cooling water is hardly cooled by the radiator 10 until the inside air temperature in the passenger compartment reaches the predetermined temperature, and the heat of the cooling water of the engine 1 is efficiently heated. Even when the outside air temperature is extremely low in winter and the inside air temperature in the vehicle interior is extremely low, the vehicle interior can be rapidly heated to an appropriate temperature. In addition, it is possible to prevent an excessive increase in the temperature of the cooling water.

In particular, in the second embodiment, since the thermostat valve 12 'is a normal thermostat valve having only its original function, the on-off valve 13 is simply provided with the existing thermostat valve used frequently. The cooling function limiting means can be easily realized by the configuration.
Next, a third embodiment will be described.

Referring to FIG. 5, there is shown a schematic configuration diagram of a vehicle heating apparatus according to a third embodiment of the present invention.
In the third embodiment, compared to the first and second embodiments, a radiator shutter (cooling function limiting means) 40 that has the same thermostat valve 12 'as the second embodiment and blocks ventilation to the radiator 10. In the following description, the description of the parts common to the first and second embodiments will be omitted, and only the different parts will be described.

  The radiator shutter 40 is disposed so as to be able to block the front surface of the radiator 10, for example. Specifically, the radiator shutter 40 is configured to draw out a shutter screen 44 wound around a winder 42 by a coil spring (not shown) by an actuator 48 via a wire 46, and the actuator 48 is connected to the ECU 50. Electrically connected.

  The thus configured vehicle heating apparatus according to the third embodiment of the present invention is controlled according to the control routine of the radiator shutter 40 shown in the flowchart of FIG. In the flowchart, as in the case of the second embodiment, the “thermostat valve” in step S10 and step S20 is replaced with the “radiator shutter” in steps S10 ″ and step S20 ″ with respect to the flowchart of FIG. 2 of the first embodiment. ”And there is no step S22, and the description of the common parts is omitted.

  Thus, in the third embodiment, after closing the radiator shutter 40 and shutting off the ventilation to the radiator 10 in step S10 ″, the inside air temperature in the passenger compartment is determined to be a predetermined temperature (for example, the air conditioner) When it is determined that the set temperature has not yet been reached, the radiator shutter 40 is kept closed until the inside air temperature in the vehicle interior reaches a predetermined temperature or higher. Until the air temperature reaches a predetermined temperature, the ventilation to the radiator 10 is blocked, and therefore the heat of the cooling water is prevented from being dissipated, and the temperature of the cooling water is sufficiently increased as in the first and second embodiments. Then, the heater core 20 is sufficiently heated, and the vehicle interior is rapidly heated.

  On the other hand, if it is determined in step S18 that the inside air temperature of the vehicle interior has reached the predetermined temperature, the process proceeds to step S20 "to control the opening of the radiator shutter 40. That is, the vehicle interior is sufficiently heated. In this case, it is not necessary to further heat the heater core 20, and the radiator shutter 40 is controlled to open to allow ventilation to the radiator 10. Thus, the temperature of the engine 1 is moderately controlled by the function of the thermostat valve 12 ′. Kept.

As described above, in the vehicle heating apparatus according to the third embodiment of the present invention, when the inside air temperature detected by the inside air temperature sensor 52 is less than the predetermined temperature, the radiator shutter 40 is closed and the cooling water in the radiator 10 is controlled. The cooling function is restricted, and when the temperature exceeds the predetermined temperature, the radiator shutter 40 is controlled to be released to release the restriction.
Thus, as in the case of the first and second embodiments, the cooling water is hardly cooled by the radiator 10 until the inside air temperature in the passenger compartment reaches the predetermined temperature, and the heat of the cooling water of the engine 1 is efficiently used. It can be used for heating well, and even when the outside temperature is extremely low in winter and the inside temperature is extremely low, the inside of the vehicle can be rapidly heated to an appropriate temperature. In addition, it is possible to prevent an excessive increase in the temperature of the cooling water.

In particular, in the third embodiment, the cooling function limiting means can be easily realized with a simple configuration in which the radiator shutter 40 is provided.
The description of one embodiment of the present invention is finished above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where there is a single inside air temperature sensor 52 has been described as an example, but a plurality of inside air temperature sensors 52 may be provided. In this case, an average temperature between the internal temperature sensors 52 may be obtained and the average temperature may be used as the internal temperature.

It is a schematic block diagram which shows the heating apparatus for vehicles which concerns on 1st Example of this invention. It is a flowchart which shows the control routine of the thermostat valve which concerns on 1st Example. It is a schematic block diagram which shows the heating apparatus for vehicles which concerns on 2nd Example of this invention. It is a flowchart which shows the control routine of the on-off valve which concerns on 2nd Example. It is a schematic block diagram which shows the heating apparatus for vehicles which concerns on 3rd Example of this invention. It is a flowchart which shows the control routine of the radiator shutter which concerns on 3rd Example.

Explanation of symbols

1 Engine 2 Radiator circuit (first cooling water passage)
3 Bypass passage 4 Heater circuit (second cooling water passage)
10 Radiator 12 Thermostat valve (cooling function limiting means)
12 'thermostat valve 13 on-off valve (cooling function limiting means)
14 Water temperature sensor 20 Heater core 40 Radiator shutter (cooling function limiting means)
50 Electronic control unit (ECU)
52 Inside air temperature sensor

Claims (5)

A radiator for cooling the engine coolant,
A first cooling water passage for circulating cooling water through the radiator;
A bypass passage provided to branch and join to the first cooling water passage, and bypassing the radiator;
The bypass passage is provided at a branch portion or a junction portion with the first cooling water passage, and when the temperature of the cooling water is lower than a predetermined water temperature, the communication of the cooling water to the radiator is interrupted, and when the temperature becomes equal to or higher than the predetermined water temperature A thermostat valve that allows communication to the radiator;
Cooling function limiting means for limiting the cooling function of cooling water by the radiator;
A second cooling water passage provided to branch and merge into the first cooling water passage, and circulating the cooling water to the heater core in the vehicle interior;
An internal air temperature detecting means for detecting the internal air temperature in the vicinity of the passenger in the passenger compartment,
Control means for controlling the cooling function limiting means,
The control means restricts the cooling function of the cooling water in the radiator by the cooling function restriction means when the inside air temperature detected by the inside air temperature detection means is less than a predetermined temperature, and releases the restriction when the temperature exceeds the predetermined temperature. A vehicle heating device. A cooling water temperature detecting means for detecting the temperature of the cooling water;
The cooling function limiting means is the thermostat valve;
The control means interrupts communication of cooling water to the radiator when the temperature of the cooling water detected by the cooling water temperature detection means is lower than a predetermined water temperature, and is detected by the internal air temperature detection means when the temperature is equal to or higher than the predetermined water temperature. The vehicle heating device according to claim 1, wherein the thermostat valve is controlled to be closed when the inside temperature is less than a predetermined temperature, and is opened when the inside temperature is equal to or higher than the predetermined temperature. The thermostat valve is configured to always communicate with the bypass passage,
The cooling function limiting means is an on-off valve interposed in a portion of the first coolant passage on the radiator side;
The control means closes the on-off valve when the inside air temperature detected by the inside air temperature detecting means is lower than a predetermined temperature, and controls the opening when the inside air temperature is equal to or higher than the predetermined temperature. Vehicle heating system. The cooling function limiting means is a shutter that blocks ventilation to the radiator;
2. The control unit according to claim 1, wherein the control unit closes the shutter when the internal temperature detected by the internal temperature detection unit is less than a predetermined temperature, and performs the open control when the internal temperature becomes equal to or higher than the predetermined temperature. Vehicle heating device. A cooling water temperature detecting means for detecting the temperature of the cooling water is provided,
When the cooling water temperature detected by the cooling water temperature detection means reaches a specified water temperature higher than the predetermined water temperature, the control means restricts the cooling function regardless of the internal air temperature detected by the internal air temperature detection means. The vehicle heating device according to any one of claims 1 to 4, wherein the restriction of the cooling function of the cooling water in the radiator by means is released.

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