JP2004291750A - Vehicle heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology by which hot air can be fed into a cabin at an early stage after an engine cold start is performed in a heating system for a vehicle. <P>SOLUTION: This heating system for a vehicle is equipped with a cooling water circulating means 1a by which the circulation amount of cooling water increases as the number of revolutions of an internal combustion engine 1 increases. The heating system for the vehicle is equipped with a heating means 3 which heats the cooling water for the internal combustion engine 1, a heat-exchanging means 5a which heat-exchanges between the cooling water for the internal combustion engine 1 and air, and raises the temperature of the air, and a regulating means 4 which regulates the temperature of air which is fed into the cabin from the heat-exchanging means 5a based on the number of revolutions of the engine. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle heating system.
[0002]
[Prior art]
A flow control valve for reducing the amount of cooling water flowing to the indoor heater core when the cooling water temperature is equal to or lower than the heater water flow restriction temperature is provided in the middle of the communication passage to the indoor heater core, and the cooling water temperature is lower than the heater water flow restriction temperature. A technique is known in which an auxiliary heating means is provided in a portion where the cooling water circulates at the time of (1) to promote warm-up of the engine and to quickly raise the temperature of the cooling water at the time of starting the engine (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-11-11739 (pages 3-6)
[0004]
[Problems to be solved by the invention]
By the way, when the engine speed increases, the circulation amount of the cooling water increases accordingly. When the circulation amount of the cooling water increases, the temperature rise becomes slow even if the cooling water is heated, and the temperature of the cooling water circulating to the heater core decreases. As a result, low-temperature air may circulate in the cabin, causing occupants to feel uncomfortable.
[0005]
The present invention has been made in view of the above-described problems, and provides a technology in a vehicle heating system capable of supplying hot air to a vehicle interior early after a cold start of an engine. Aim.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the vehicle heating system of the present invention employs the following solutions. That is,
A heating system for a vehicle including a heat medium circulating unit in which the circulation amount of the heat medium increases as the rotation speed of the internal combustion engine increases,
Heating means for heating the heat medium,
Heat exchange means for exchanging heat between the heat medium and air to increase the temperature of air,
Adjusting means for adjusting the temperature of the air supplied from the heat exchange means to the room based on the engine speed,
It is characterized by having.
[0007]
The greatest feature of the present invention is that the temperature of the air supplied from the heat exchange means is adjusted based on the engine speed so that the temperature does not decrease when the internal combustion engine is running at a high speed.
[0008]
In the vehicle heating system thus configured, the heating medium is heated by the heating means, but the flow rate of the heating medium changes according to the engine speed. That is, as the engine speed increases, the flow rate of the heat medium circulating through the heating means increases. Here, the temperature of the heat medium after being heated by the heating means differs depending on the time during which the heating means is heating and the amount of heat supplied by the heating means. For example, when the flow rate of the heating medium is increased, the time during which the heating medium is being heated is shortened, or the amount of heat supplied by the heating means is decreased, so that the temperature rise of the heating medium is reduced. Therefore, when the engine speed is increased, the temperature of the heat medium does not increase so much even if it is heated by the heating means, and the temperature of the air supplied into the room does not increase. In that regard, by adjusting the temperature supplied from the heat exchange means based on the engine speed, it is possible to make the temperature supplied from the heat exchange means appropriate even when the engine speed is high. Become.
[0009]
In the present invention, the adjusting means can set the amount of the heat medium circulating through the heating means to a predetermined value or less.
[0010]
By maintaining the flow rate of the heating medium at a predetermined value or less, the time during which the heating medium is heated by the heating means can be increased, or the amount of heat supplied per unit volume of the heating medium can be increased. It is possible to increase the temperature of the heat medium. Therefore, it is possible to increase the temperature of the air supplied into the vehicle interior. Here, the “predetermined value” is a circulation amount of the heat medium required to obtain a temperature of the heat medium that can supply air having a temperature that does not cause discomfort to the occupant into the room.
[0011]
In the present invention, the adjusting means can suppress an increase in the amount of the heat medium circulating in the heating means as the rotational speed of the internal combustion engine increases.
[0012]
As the engine speed increases, the flow rate of the heat medium heated by the heating means increases, and the temperature rises slowly. On the other hand, by suppressing an increase in the flow rate of the heat medium, the temperature of the heat medium after being heated by the heating means can be increased. Therefore, it is possible to increase the temperature of the air supplied into the vehicle interior. When the engine speed is low, the temperature of the heat medium is increased by the heating means satisfactorily. Therefore, when the temperature of the heat medium is slower than the engine speed, the heat circulating through the heating means is not increased. It is not necessary to suppress the increase in the amount of the medium.
[0013]
In the present invention, the adjusting means can circulate the heat medium so that the temperature of the heat medium heated by the heating means is lower than the boiling point.
[0014]
When the circulation amount of the heat medium is reduced, the heat medium may be boiled by heating by the heating means. Therefore, by ensuring the circulation amount of the heat medium such that the temperature of the heat medium is lower than the boiling point, it is possible to suppress the boiling of the heat medium by the heating means and to suppress the decrease in the cooling performance of the internal combustion engine. .
[0015]
In the present invention, the apparatus further comprises an air flow rate adjusting means for adjusting an amount of air supplied from the heat exchanging means to the room, wherein the adjusting means reduces the amount of air passing through the heat exchanging means as the engine speed decreases. Can be increased.
[0016]
When the rotation speed of the internal combustion engine is low, the temperature of the heat medium after being heated by the heating means increases. If the flow rate of the air for which heat exchange is performed by the heat exchange means is small, the temperature of the air becomes too high, giving the occupant a discomfort. In that respect, the time during which the air is heated by the heat exchanging means is shortened by increasing the amount of air to be exchanged by the heat exchanging means as the engine speed becomes lower, or The amount of heat received by the air per volume can be reduced to suppress an excessive rise in the temperature of the air. In addition, as the engine speed increases, the flow rate of the heat medium heated by the heating means increases, and the temperature of the heat medium increases slowly. Therefore, a low-temperature heat medium is supplied to the heat exchange means. In this case, even if heat exchange is performed by the heat exchange means, the temperature of the air does not increase so much. In addition, the low-temperature air circulates through the passenger compartment, which may cause discomfort to the occupant. In this regard, by increasing the amount of air passing through the heat exchange means as the engine speed decreases, it is possible to suppress the supply of low-temperature air into the vehicle interior.
[0017]
In the present invention, the apparatus further includes an outside air introduction unit for introducing outside air for heat exchange with the heat medium, and the adjustment unit can increase the amount of outside air introduced to the heat exchange unit as the engine speed decreases.
[0018]
If the amount of air passing through the heat exchange means is small after the temperature of the heat medium has risen, the temperature of the air will be too high, causing discomfort to the occupant. In this regard, as the engine speed decreases, the amount of outside air introduced into the heat exchange means is increased, so that an excessive rise in the temperature of the air can be suppressed. That is, when a heater is used, since the outside air is usually lower in temperature than the air in the vehicle cabin, by introducing the outside air, the air supplied from the heat exchange means even if the heat medium becomes high temperature. Temperature rise can be suppressed.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
<First embodiment>
Hereinafter, an embodiment of a vehicle heating system according to the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a diagram showing a schematic configuration of a vehicle heating system according to the present embodiment.
[0021]
In the engine 1, both ends of the cooling water passage 2 are connected, and the cooling water circulates through the engine 1 and the cooling water passage 2. This engine 1 includes a water pump 1a. One end of a cooling water passage 2 is connected to the water pump 1a, and the cooling water flowing through the cooling water passage 2 is discharged into the engine 1 by the water pump 1a. The cooling water that has passed through the engine 1 is discharged to the other end of the cooling water passage 2. The cooling water passage 2 has a combustion type heater 3 for burning fuel separately from the engine 1 and raising the temperature of the cooling water by the heat of the combustion gas generated at that time, and a flow rate of the cooling water circulating through the cooling water passage 2. A flow control valve 4 to be adjusted and a heater core 5a as a vehicle interior heating device for increasing the indoor temperature of a vehicle equipped with an engine are provided in order, and the cooling water flows in this order.
[0022]
The heater core 5a is housed in the heater 5, and the heater 5 is provided with a blower fan 5b, a flow path regulating valve 5c, a vehicle interior air passage 5d, and an outside air passage 5e. In the heater core 5a, heat exchange is performed between the cooling water and vehicle interior air or outside air. When the blower fan 5b operates, air passes through the heater core 5a via the vehicle interior air passage 5d or the outside air passage 5e. The ratio of the vehicle interior air and the outside air passing through the heater core 5a is adjusted by the position of the flow path adjustment valve 5c. Further, the amount of vehicle interior air or outside air passing through the heater core 5a can be adjusted by changing the rotation speed of the blower fan 5b.
[0023]
At the outlet of the blower fan 5b, a heater outlet temperature sensor 5f for outputting a signal corresponding to the temperature of the air is attached.
[0024]
The combustion type heater 3 is a heater that burns the same fuel as the fuel used in the engine 1 and raises the temperature of cooling water flowing through the cooling water passage 2 using heat generated by the combustion. The warmed cooling water is sent to a place where the temperature needs to be raised, such as the heater core 5a and the engine 1, and raises the temperature of the place where the temperature needs to be raised.
[0025]
Further, a cooling water temperature sensor 3a that outputs a signal corresponding to the temperature of the cooling water flowing through the cooling water passage is attached to the cooling water passage 2 downstream of the combustion type heater 3.
[0026]
The engine 1 is provided with an electronic control unit (ECU: Electronic Control Unit) 6 for controlling the engine 1. The ECU 6 is a unit that controls the operating state of the engine 1 according to the operating conditions of the engine 1 and the driver's requirements.
[0027]
In addition to the coolant temperature sensor 3a and the heater outlet temperature sensor 5f, various sensors are connected to the ECU 6 via electric wiring, and output signals of the various sensors described above are input to the ECU 6.
[0028]
On the other hand, the combustion type heater 3, the flow control valve 4, the blower fan 5b, the flow path control valve 5c, and the like are connected to the ECU 6 via electric wiring, so that the above-described components can be controlled by the ECU 6. .
[0029]
The ECU 6 stores various application programs and various control maps.
[0030]
For example, the ECU 6 controls the combustion type heater 3. The ECU 6 establishes predetermined combustion conditions (for example, the outside air temperature is 5 ° C. or less and the cooling water temperature is 80 ° C. or less) based on the signal from the cooling water temperature sensor 3a. It is determined whether or not the operation is performed, and if not, the operation of the combustion heater is not performed. When it is determined that the combustion condition of the combustion heater 3 is satisfied, the fuel is burned in the combustion heater 3. When the temperature of the cooling water is increased, fuel and air are supplied to the combustion type heater 3 so that the combustion type heater 3 generates the maximum amount of heat.
[0031]
Here, in the conventional vehicular heating system, the water pump 1a operates at a rotation speed proportional to the output shaft of the engine 1, so that as the engine rotation speed increases, the discharge amount of the cooling water increases, and The amount of cooling water flowing through the water passage was increasing. The temperature of the cooling water heated by the combustion heater 3 changes depending on the flow rate of the cooling water. That is, when the flow rate of the cooling water is small, the temperature of the cooling water is increased by, for example, about 10 ° C. in the combustion type heater 3, but when the flow rate of the cooling water is large, only the temperature increases by 1 to 2 ° C. This is because, as the cooling water flow rate increases, the amount of heat received from the combustion heater 3 per unit volume of the cooling water decreases. As the cooling water flow rate increases, the temperature of the cooling water before and after passing through the combustion heater 3 increases. The difference is smaller. Therefore, when the engine speed is high and the flow rate of the cooling water is large, the temperature of the cooling water introduced into the heater core 5a decreases, and the temperature of the hot air supplied from the heater 5 into the vehicle interior (hereinafter referred to as the heater blowing temperature) ) Was rising slowly. Then, the temperature of the hot air from the heater 5 differs by, for example, slightly less than 10 ° C. between when the vehicle is running at a high engine speed and when the vehicle is stopped at a low engine speed, which may give a passenger an uncomfortable feeling.
[0032]
Conventionally, the amount of cooling water is controlled with the aim of early warm-up of the engine. Therefore, even if the combustion type heater 3 is provided in the cooling water passage, the temperature of the heater outlet varies depending on the engine speed as described above. Was. This control reduces the flow rate of the cooling water irrespective of the rotation speed of the engine 1. When the combustion type heater 3 is provided in the cooling water passage, the cooling water is reduced by reducing the flow rate of the cooling water. There was a risk of boiling in the combustion type heater 3.
[0033]
In this regard, in the present embodiment, when the cooling water is heated by the combustion type heater 3 and the engine speed is high, an increase in the flow rate of the cooling water is suppressed.
[0034]
In this case, the flow rate of the cooling water may be maintained at a predetermined amount or less, or the increase in the flow rate of the cooling water may be suppressed as the engine speed increases. Here, the predetermined amount is a cooling water flow rate required to secure a heater blowing temperature that does not cause discomfort to the occupant, as compared with the heater blowing temperature based on the cooling water temperature when the engine speed is low. This is the upper limit and is determined in advance by experiments or the like. In addition, suppressing the increase in the flow rate of the cooling water means that the cooling required to secure the heater blowing temperature that does not cause occupant discomfort compared to the heater blowing temperature based on the cooling water temperature when the engine speed is low. The water flow rate is provided for each engine speed, and is determined in advance by experiments or the like. Here, the suppression of the rise in the flow rate of the cooling water is performed by setting the upper limit of the cooling water flow rate for each rotation speed, setting the reduction amount of the cooling water flow rate for each rotation speed, and cooling water proportional to the rotation speed of the engine 1. This may be performed by setting the amount of reduction in the flow rate. Further, when the rotation speed of the engine 1 is low, the temperature of the cooling water by the combustion-type heater 3 is increased satisfactorily. It is not necessary to suppress the amount of cooling water.
[0035]
In the present embodiment, the flow rate of the cooling water can be adjusted by the opening amount of the flow control valve 4.
[0036]
FIG. 2 is a diagram showing the relationship between the engine speed and the coolant temperature.
[0037]
The engine outlet water temperature is the temperature of the cooling water flowing from the engine 1 to the cooling water passage 2, and may be the temperature of the cooling water from the engine 1 to the combustion heater 3. The combustion heater outlet water temperature is the temperature of the cooling water flowing out of the combustion heater 3 and may be the temperature of the cooling water between the combustion heater 3 and the heater core 5a. The control based on the conventional cooling water flow control is referred to as (no control), and the control based on the cooling water flow control according to the present embodiment is referred to as (with control). As described above, in the case of (no control), as the engine speed increases, the water temperature at the outlet of the combustion-type heater decreases, and the temperature at the heater outlet decreases. In this regard, in the case of (with control), the water temperature at the outlet of the combustion heater that affects the heater outlet temperature can be increased, and the heater outlet temperature is increased even when the engine speed increases. be able to.
[0038]
FIG. 3 is a diagram showing the relationship between the engine speed and the coolant flow rate.
[0039]
The control (1) is for maintaining the flow rate of the cooling water at a predetermined amount or less, and the control (2) is for suppressing an increase in the flow rate of the cooling water according to the engine speed when the engine speed is high. To do.
[0040]
For example, the relationship between the engine speed and the opening amount of the flow control valve 4 is determined in advance through experiments and the like so that the relationship between the engine speed and the coolant flow rate becomes the relationship shown in FIG. It is stored in the ECU 6. Then, the amount of opening of the flow control valve 4 can be obtained by substituting the engine speed into the map.
[0041]
In the present embodiment, the cooling water flow rate may be controlled when the cooling water temperature becomes equal to or higher than a predetermined temperature. Here, the “predetermined temperature” is the temperature of the cooling water when the air blown out from the heater 5 is felt by the occupant to be warm, and is obtained in advance by an experiment or the like. The coolant temperature is detected by a coolant temperature sensor 3a.
[0042]
Further, the control of the flow rate of the cooling water may be performed when the heater blowing temperature becomes equal to or higher than a predetermined temperature. Here, the “predetermined temperature” is a heater blowing temperature when the air blown out from the heater 5 is felt by the occupant to be warm, and is obtained in advance by an experiment or the like. The heater outlet temperature is detected by a heater outlet temperature sensor 5f.
[0043]
When the cooling water temperature is lower than a certain temperature, the temperature of the air blown out from the heater 5 also becomes low, and even if the cooling water flow rate is controlled, the occupant does not easily feel the temperature rise. In such a case, the control of the cooling water flow rate is not performed. This can prevent the control from being unnecessarily complicated.
[0044]
In the present embodiment, when the flow rate of the cooling water is reduced for early warm-up of the engine, the flow rate of the cooling water flowing through the combustion heater 3 may be controlled so as to satisfy the following conditions.
[0045]
That is, the cooling water flow rate required for preventing the cooling water from boiling in the combustion type heater 3 and the cooling water flow rate required for performing the early warm-up of the engine are compared with the larger cooling water flow rate. Thus, the opening amount of the flow control valve 4 is controlled. Here, in order not to boil the cooling water in the combustion type heater 3, it is necessary to maintain the cooling water at a certain flow rate or more. On the other hand, for early warm-up of the engine, it is preferable that the flow rate of the cooling water is small. Therefore, if the flow rate of the cooling water is set to the larger one, the engine can be quickly warmed up within a range in which the boiling of the cooling water in the combustion heater 3 does not occur.
[0046]
In addition, in order to set the cooling water flow rate necessary for preventing the cooling water from boiling in the combustion type heater 3, the cooling water flow rate necessary for performing the early warm-up of the engine, and the heater blowing temperature to the temperature desired by the occupant. May be compared with the required cooling water flow rate, and the opening amount of the flow control valve 4 may be controlled so that the largest cooling water flow rate is obtained. Here, the flow rate of the cooling water should be small in order to set the heater blowing temperature to a temperature preferred by the occupant. Accordingly, assuming that the cooling water flow rate is the largest, it is possible to quickly warm up the engine or to set the heater outlet temperature to a temperature preferred by the occupant within a range in which the boiling of the cooling water in the combustion type heater 3 does not occur. it can.
[0047]
In the present embodiment, when the engine speed is low, the flow rate of the air passing through the heater core 5a may be increased in order to lower the heater blowing temperature. That is, when the engine speed is low, the flow rate of the cooling water passing through the combustion type heater 3 decreases. Therefore, in the combustion type heater 3, the rising temperature of the cooling water increases. When the cooling water passes through the heater core 5a, the temperature rise of the air increases due to heat exchange in the heater core 5a, and the heater blowout temperature rises. This may cause discomfort to the occupant.
[0048]
In this regard, when the flow rate of the air passing through the heater core 5a is increased, the amount of heat received by the air per unit volume is reduced, so that the temperature rise of the air can be reduced. Therefore, even when the engine speed decreases and the cooling water temperature increases, the temperature of the blowout of the heater can be reduced. The flow rate of air passing through the heater core 5a is increased by increasing the rotation speed of the blower fan 5b. For example, the relationship between the engine speed and the blower fan speed can be obtained in advance through experiments or the like and mapped, and the engine speed can be substituted into the map to obtain the speed of the blower fan 5b. Further, the rotation speed of the blower fan 5b may be controlled such that the temperature detected by the heater blowout temperature sensor 5f is a temperature that does not cause discomfort to the occupant.
[0049]
In the present embodiment, when the engine speed is low, outside air may be introduced into the heater core 5a in order to lower the heater blowing temperature. Here, it is considered that the heater is used when the outside air temperature is low. Therefore, when outside air is introduced, low-temperature air passes through the heater core 5a. Even if the temperature of the air rises greatly, the temperature of the air after the rise can be lowered, and the temperature of the heater blowout decreases. Can be done. For example, the relationship between the engine speed and the position of the flow path adjustment valve 5c can be obtained in advance through experiments or the like and mapped, and the position of the flow path adjustment valve 5c can be obtained by substituting the engine speed into the map. Then, outside air can be introduced at a rate corresponding to the position of the flow path adjustment valve 5c. Further, the position of the flow path adjustment valve 5c may be feedback-controlled so that the temperature detected by the heater blowout temperature sensor 5f is a temperature at which the occupant does not feel uncomfortable.
[0050]
In the present embodiment, a combustion type heater has been described as an example, but other heaters, for example, an electric heater can be applied instead.
[0051]
As described above, according to the present embodiment, when the engine 1 is operated at a high speed, the flow rate of the cooling water can be suppressed, and the temperature rise in the combustion heater 3 can be promoted. . Thereby, the heater blowing temperature can be increased. In addition, when the cooling water temperature is low or the heater blowing temperature is low, the control by the flow rate adjustment valve 4 is not performed, and it is possible to suppress the control from being unnecessarily complicated. Further, the engine 1 can be warmed up early within a range where boiling of the cooling water does not occur in the combustion type heater. When the rotation speed of the engine 1 is low and the heater blowing temperature is high, the amount of air passing through the heater core can be reduced, or the amount of outside air introduced can be increased to lower the heater blowing temperature.
<Second embodiment>
This embodiment is different from the first embodiment in that the flow control valve 4 is connected in parallel with the combustion type heater 3 and the heater core 5a. Note that, in the present embodiment, the basic configuration of the engine and other hardware to which the present invention is applied is the same as that of the first embodiment, and a description thereof will be omitted.
[0052]
FIG. 4 is a diagram showing a schematic configuration of the vehicle heating system according to the present embodiment.
[0053]
Both ends of a cooling water passage 2 are connected to the engine 1. The cooling water passage 2 branches on the way, and one of the branched cooling water passages 2 is connected to the combustion type heater 3 and the flow control valve 4 in this order, and the other cooling water passage 2 is connected to the flow control valve 4. Have been. The one cooling water passage 2 is connected to the engine 1 via the combustion type heater 3 and the heater core 5a. The other cooling water passage 2 joins one of the cooling water passages 2 downstream of the heater core 5a via a flow control valve 4.
[0054]
In the vehicle heating system configured as described above, compared to the system in which the flow control valve 4 is connected in series with the combustion type heater 3 and the heater core 5a as described in the first embodiment, when the engine is running at a high speed. The pressure of the cooling water can be reduced. That is, when the series connection is made, when the flow control valve 4 is controlled to the closing side in order to reduce the flow rate of the cooling water passing through the combustion type heater 3 or the heater core 5a, from the engine 1 to the flow control valve 4 The pressure of the cooling water in the cooling water passage 2 rises. Then, the higher the engine speed, the higher the pressure of the cooling water.
[0055]
In this regard, in the present embodiment, when the engine speed increases and the flow rate of the cooling water passing through the combustion type heater 3 and the heater core 5a increases, the flow control valve 4 is controlled to the valve opening side to control the flow rate. The flow rate of cooling water passing through the regulating valve 4 is increased. Thereby, the flow rate of the cooling water passing through the combustion type heater 3 and the heater core 5a can be reduced while suppressing an increase in the pressure of the cooling water. Therefore, when the engine speed is high, the flow rate of the cooling water can be reduced as compared with the first embodiment.
[0056]
【The invention's effect】
In the vehicle heating system according to the present invention, when the internal combustion engine is operated at a high speed, the flow rate of the heat medium can be suppressed, and the temperature rise of the heat medium in the heating means can be promoted. Thereby, the temperature of the air supplied from the heat exchange means to the room can be increased.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a vehicle heating system according to a first embodiment.
FIG. 2 is a diagram showing a relationship between an engine speed and a cooling water temperature.
FIG. 3 is a diagram showing a relationship between an engine speed and a cooling water flow rate.
FIG. 4 is a diagram showing a schematic configuration of a vehicle heating system according to a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine 1a Water pump 2 Cooling water passage 3 Combustion heater 3a Cooling water temperature sensor 4 Flow control valve 5 Heater 5a Heater core 5b Blower fan 5c Flow control valve 5d Car air passage 5e Outside air passage 5f Heater outlet temperature sensor 6 ECU

Claims (6)

A heating system for a vehicle including a heat medium circulating unit in which the circulation amount of the heat medium increases as the rotation speed of the internal combustion engine increases,
Heating means for heating the heat medium,
Heat exchange means for exchanging heat between the heat medium and air to increase the temperature of air,
Adjusting means for adjusting the temperature of air supplied from the heat exchange means to the room based on the engine speed;
A heating system for a vehicle, comprising: The vehicle heating system according to claim 1, wherein the adjusting unit sets the amount of the heat medium circulating through the heating unit to a predetermined value or less. 3. The vehicle heating system according to claim 1, wherein the adjustment unit suppresses an increase in the amount of the heat medium circulating in the heating unit with an increase in the rotation speed of the internal combustion engine. 4. 4. The vehicle heating system according to claim 1, wherein the adjusting unit circulates the heat medium such that a temperature of the heat medium heated by the heating unit is lower than a boiling point. 5. The apparatus further includes an air flow rate adjusting means for adjusting an amount of air supplied from the heat exchanging means to the room, wherein the adjusting means increases the amount of air passing through the heat exchanging means as the engine speed decreases. The vehicle heating system according to any one of claims 1 to 4, wherein The apparatus according to claim 1, further comprising outside air introduction means for introducing outside air for heat exchange with the heat medium, wherein the adjustment means increases the amount of outside air introduced to the heat exchange means as the engine speed decreases. 5. The vehicle heating system according to any one of items 5.

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