JPH0880727A - Heating device for automobile - Google Patents

Abstract

PURPOSE: To provide a heating device for automobile, which can prevent the burning stop due to the over-heating of a combustion heater 16 and which can stably supply the hot air. CONSTITUTION: A combustion heater 16 of a heating device has a first exhausting passage 34 and a second exhausting passage 35 for exhausting the burning gas generated in a combustion chamber 24, and heats the hot water circulating in a hot water circuit 34a by the heat exchange with the burning gas flowing in a peripheral passage 34a (the first exhausting passage 34) formed in the periphery of the combustion chamber 24. All burning gas generated in the combustion chamber 24 is flowed in the first exhausting passage 34 and exhausted when a switching valve 37 for opening and closing the second exhausting passage 35 closes the second exhausting passage 35. Consequently, when the switching valve 37 opens the second exhausting passage 35, the burning gas is flowed in both the first exhausting passage 34 and the second exhausting passage 35, and exhausted. Opening and closing of the switching valve 37 is controlled on the basis of the detected temperature of a water temperature sensor 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating system for an automobile using a combustion heater.

[0002]

2. Description of the Related Art Conventionally, some electric vehicles, which cannot secure a sufficient heat source for heating as compared with a gasoline-powered vehicle equipped with an engine, use a combustion heater as a heating device. The combustion heater includes a combustion device that mixes fuel with combustion air and burns it, and a hot water heater that heats hot water (for example, antifreeze liquid) by the combustion gas generated by the combustion device. The hot water is circulated between the heater core arranged in the duct.

[0003]

In a heating device using this combustion type heater, as shown in FIG. 6, the heat generation amount of the combustion type heater is controlled by controlling the heat generation amount of the indoor blower blown to the heater core. The temperature of hot water is controlled. Therefore, the hot water temperature can be kept constant when the heat generation amount of the combustion heater and the heat radiation amount of the heater core are substantially equal. However, if the indoor blower is switched from Hi operation to Lo operation (or OFF) to reduce the heat radiation amount in the heater core, the water temperature rises even if the heat generation amount in the combustion heater is suppressed. Therefore, it becomes necessary to stop the combustion.

However, since the heat capacity of the hot water circuit used in this heating device is smaller than that of the cooling water circuit of the water-cooled engine, the water temperature drops sharply when combustion in the combustion heater is stopped. Further, in the combustion heater, once the combustion is stopped, it takes a certain amount of time to perform the exhaust and preheat before starting the combustion again. Therefore, it takes a while before the combustion starts and the water temperature rises. . Therefore, after the combustion is stopped, the required warm air cannot be obtained until the water temperature actually rises after the combustion is restarted, which causes a problem that the feeling of heating is impaired. The present invention has been made based on the above circumstances, and an object thereof is to provide an automobile heating device capable of preventing combustion stop due to overheating of a combustion heater and stably supplying hot air. is there.

[0005]

In order to achieve the above object, the present invention provides, in claim 1, a duct for introducing air into a vehicle compartment, and a blower for introducing air into the duct and sending the air to the vehicle interior. A heater core disposed in the duct for heating the air sent from the blower by heat exchange with a heat medium flowing inside, a circulation circuit for circulating the heat medium through the heater core, and the circulation circuit A pump that circulates a heat medium, a combustion device that burns fuel, a first exhaust passage and a second exhaust passage through which combustion gas generated in the combustion device is exhausted, and combustion that flows through the first exhaust passage. Heat exchange means for exchanging heat between the gas and the heat medium flowing through the circulation circuit; opening and closing means for opening and closing the second exhaust passage; heat medium temperature detecting means for detecting the temperature of the heat medium flowing through the circulation circuit; this Adopt the technical means and control means for controlling said switching means based on the detected temperature of the medium temperature detecting means.

According to a second aspect of the present invention, a duct for introducing air into the vehicle compartment, a blower for introducing air into the duct and sending the air into the vehicle compartment, a combustion device for burning fuel, and a combustion device for producing the fuel are provided. Heat for heating the air sent from the blower by heat exchange between the first exhaust passage and the second exhaust passage through which the combustion gas is exhausted, and the combustion gas that is arranged in the duct and flows through the first exhaust passage. Exchange means, opening / closing means for opening / closing the second exhaust passage, gas temperature detecting means for detecting the temperature of the combustion gas flowing in the first exhaust passage, and the opening / closing means based on the temperature detected by the gas temperature detecting means. The technical means provided with the control means which controls is adopted.

According to a third aspect of the present invention, in the vehicle heating apparatus according to the first aspect, the control means is configured to control the second temperature when the temperature detected by the heat medium temperature detection means is lower than a predetermined temperature.
The opening / closing means is controlled to close the exhaust passage, and the opening / closing means is controlled to open the second exhaust passage when the temperature detected by the heat medium temperature detecting means reaches the predetermined temperature. To do.

According to a fourth aspect of the present invention, in the vehicle heating apparatus according to the second aspect, the control means closes the second exhaust passage when the temperature detected by the gas temperature detection means is lower than a predetermined temperature. The opening / closing means is controlled, and the opening / closing means is controlled to open the second exhaust passage when the temperature detected by the gas temperature detecting means reaches the predetermined temperature.

According to a fifth aspect of the present invention, in the vehicle heating apparatus according to the first aspect, the heat medium temperature detecting means detects the temperature of the heat medium before heat exchange with the combustion gas in the heat exchanger. It is characterized by

According to a sixth aspect of the present invention, in the vehicle heating apparatus according to the first or second aspect, the blower has a variable blowing capacity. According to a seventh aspect, in the vehicle heating apparatus according to the first or second aspect, the combustion device is capable of varying a combustion amount.

[0011]

In the vehicle heating device according to the first aspect of the present invention, the heat medium circulating in the circulation circuit is heated by heat exchange with the combustion gas flowing in the first exhaust passage by the heat exchange means, and the duct is formed. Heat is radiated by heat exchange with the air sent from the blower by the heater core arranged inside. Where the first
The flow rate of the combustion gas flowing through the exhaust passage changes depending on the open / close state of the second exhaust passage. That is, when the second exhaust passage is closed by the opening / closing means, all the combustion gas generated in the combustion device flows through the first exhaust passage and is exhausted, and when the second exhaust passage is opened by the opening / closing means, the combustion device is opened. The combustion gas generated in 1 flows through both the first exhaust passage and the second exhaust passage and is exhausted.

Therefore, by controlling the opening / closing operation of the opening / closing means to increase / decrease the flow rate of the combustion gas flowing through the first exhaust passage, the temperature of the heat medium exchanged with the combustion gas by the heat exchange means can be controlled. . Specifically, as described in claim 3, when the temperature of the heat medium before heat exchange with the combustion gas is lower than a predetermined temperature, the second opening / closing means is used.
By closing the exhaust passage and increasing the flow rate of the combustion gas flowing through the first exhaust passage, the temperature of the heat medium exchanged with the combustion gas by the heat exchange means can be increased. Further, when the temperature of the heat medium before heat exchange with the combustion gas reaches a predetermined temperature, the second exhaust passage is opened by the opening / closing means to reduce the flow rate of the combustion gas flowing through the first exhaust passage. Thus, the temperature rise of the heat medium exchanged with the combustion gas can be suppressed low.

With this, it is not necessary to stop the combustion in order to prevent overheating of the combustion device due to the temperature rise of the heat medium, so that it is possible to prevent the temperature drop of the heat medium due to the stop of combustion, and as a result, to stabilize the temperature. It is possible to supply warm air effectively.

In the vehicle heating apparatus according to the second aspect, the air flowing in the duct (air sent by the blower) is heated by heat exchange with the combustion gas flowing in the first exhaust passage by the heat exchange means. Is supplied to the passenger compartment. Here, the flow rate of the combustion gas flowing through the first exhaust passage changes according to the open / close state of the second exhaust passage, as in the case of claim 1. Therefore, by controlling the opening / closing operation of the opening / closing means to increase / decrease the flow rate of the combustion gas flowing through the first exhaust passage, the temperature of the air heat-exchanged with the combustion gas by the heat exchange means can be controlled.

Specifically, as described in claim 4, the first
When the temperature of the combustion gas flowing through the exhaust passage is lower than a predetermined temperature, the second exhaust passage is closed by the opening / closing means to increase the flow rate of the combustion gas flowing through the first exhaust passage, so that the heat exchange means exchanges heat with the combustion gas. It is possible to raise the temperature of the air that is blown. Further, when the temperature of the combustion gas flowing through the first exhaust passage reaches a predetermined temperature, the second exhaust passage is opened by the opening / closing means to reduce the flow rate of the combustion gas flowing through the first exhaust passage, so that the heat exchange means heats the combustion gas. It is possible to suppress the temperature rise of the air that is heat-exchanged with the air.

With this, it is not necessary to stop the combustion in order to prevent the combustion device from overheating due to the rise in the temperature of the combustion gas, so that it is possible to prevent the temperature of the air from decreasing due to the stop of the combustion, and as a result, to stabilize the temperature. It is possible to supply warm air to the.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of an automobile heating system of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of a combustion heater, and FIG. 2 is an overall schematic view of a vehicle air conditioner.
The vehicle air conditioner 1 of this embodiment is mounted on an electric vehicle, and includes a blower 2, a duct 3, a cooling device (described later), a heating device (described later), and a control device 4 (FIG. 3).
See) and the like.

As shown in FIG. 2, the blower 2 comprises a blower case 2a integrally formed with the inside / outside air switching box 5, a centrifugal fan 2b, and a blower motor 2c. The voltage applied to the blower motor 2c (blower voltage ), The rotation speed (blowing amount) of the blower motor 2c is determined. In addition,
The blower 2 can be used by switching the air volume level between three levels of "Hi" for high air volume, "Lo" for low air volume, and "OFF" for stopping air flow.

The inside / outside air switching box 5 is formed with an inside air introducing port 5a for introducing inside air and an outside air introducing port 5b for introducing outside air, and the inside air introducing port 5a and the outside air introducing port 5b are selectively formed. An inside / outside air switching damper 6 that opens and closes is provided. The inside / outside air switching damper 6 is driven by an actuator (for example, a servomotor) via a link mechanism (not shown).

The duct 3 guides the air introduced by the blower 2 into the passenger compartment, and its downstream end communicates with each of the air outlets 7, 8 and 9 opening into the passenger compartment. Each outlet 7-9
Is provided with a defroster outlet 7 that blows air toward the window glass of the vehicle, a face outlet 8 that blows air toward the upper half of the occupant, and a foot outlet 9 that blows air toward the feet of the occupant. Each of the outlets 7 to 9 is an outlet switching damper 10 driven by an actuator (for example, a servomotor) via a link mechanism (not shown).
It is selectively opened and closed by 11.

The cooling device is composed of a well-known refrigeration cycle (not shown), and the refrigerant evaporator 12 of the refrigeration cycle is arranged in the duct 3. The refrigerant evaporator 12 cools the air sent from the blower 2 by exchanging heat with the low-temperature low-pressure refrigerant supplied along with the operation of the refrigerant compressor (not shown).

In the heating device, a hot water circuit 13 (circulating circuit of the present invention) in which hot water (heat medium) circulates, a water pump 14 for circulating hot water in the hot water circuit 13, a heater core 15 interposed in the hot water circuit 13, and It is composed of a combustion type heater 16 (combustion device of the present invention) for heating the hot water circulating in the hot water circuit 13. In this embodiment, antifreeze liquid (ethylene glycol aqueous solution) is used as the hot water.

The hot water circuit 13 is provided with a pressure cap 17 which opens when the pressure in the hot water circuit 13 rises as the temperature of the hot water rises and reaches a predetermined set pressure.
The pressure cap 17 is connected to a reserve tank 18 for storing hot water flowing out when the valve is opened.
A water temperature sensor 19 that detects the temperature of hot water at the inlet of the combustion heater 16 is installed in the hot water circuit 13. The water temperature sensor 19 includes, for example, a temperature sensitive element such as a thermistor, and the detected hot water temperature is used as a water temperature signal in the control device 4.
Output to.

The heater core 15 is arranged in the duct 3 at the lee side of the refrigerant evaporator 12, and heats the passing air by heat exchange with the hot water flowing inside. In the duct 3, the air passing through the refrigerant evaporator 12 is heated by the heater core 15
The bypass passage 20 is formed so as to be able to bypass the heater core 15 and the amount of air passing through the heater core 15 and the bypass passage 20.
The ratio to the amount of air passing through is adjusted by the air mix damper 21 arranged in the duct 3. The air mix damper 21 is driven by an actuator (for example, a servo motor) via a link mechanism (not shown).

The combustion heater 16 heats the hot water flowing in the hot water circuit 13 by heat exchange with the combustion gas generated by the combustion of the fuel. This combustion heater 16
As shown in FIG. 1, a premix chamber 22 for mixing the fuel and the fuel air, a glow plug 23 for preheating and igniting the fuel, a combustion chamber 24 for burning the fuel, and a combustion generated by burning the fuel. Exhaust means for exhausting gas (described below), hot water passage 25 forming part of the hot water circuit 13, heat exchange fins 26 for exchanging heat between combustion gas and hot water (heat exchange means of the present invention), etc. It is composed of

The premixing chamber 22 has a bottom side (left side in FIG. 1).
An air introduction path 27 for introducing combustion air is provided in
Combustion air is introduced by the operation of the combustion fan 28 (see FIG. 2) interposed in the air introduction passage 27. Inside the premixing chamber 22, there is provided a swirling cylinder 29 into which the combustion air introduced from the air introducing passage 27 flows while spirally swirling. The swirl cylinder 29 is provided in a protruding manner inside the premix chamber 22 so as to communicate with the air introduction passage 27, and a plurality of slits 29a through which combustion air passes are formed at equal intervals on the peripheral wall surface thereof.

A fuel introduction cylinder 31 for holding the glow plug 23 and introducing the fuel supplied through the fuel pipe 30 into the premix chamber 22 is provided on the side wall surface of the premix chamber 22. . As shown in FIG. 2, the fuel pipe 30 includes a fuel tank 32 for storing fuel and a fuel introduction tube 3
1 and the fuel pump 33 interposed in the fuel pipe 30 is actuated to move the fuel introduction pipe 31 from the fuel tank 32.
Direct fuel to. The combustion chamber 24 communicates with the premixing chamber 22 to form a cylindrical space, and the tip side (right side in FIG. 1) is open.

The exhaust means comprises a first exhaust passage 34, a second exhaust passage 35, and an opening / closing device (described below) for opening and closing the second exhaust passage 35. First exhaust passage 34
Is an outer peripheral passage 34a formed in a cylindrical shape on the outer periphery of the combustion chamber 24.
And a connecting passage 34b connecting the outer peripheral passage 34a and the second exhaust passage 35, the combustion gas flowing out of the combustion chamber 24 flows along the outer peripheral wall of the combustion chamber 24 through the outer peripheral passage 34a, and then, It is provided so as to join the second exhaust passage 35 through the passage 34b. The second exhaust passage 35 is provided so as to extend in the front end direction of the combustion chamber 24 (rightward in FIG. 1) at the center position of the cylindrical combustion chamber 24.
After merging with, it is opened to the outside air through the muffler 36 (see FIG. 2).

The opening / closing device includes an opening / closing valve 37 for opening / closing the second exhaust passage 35, an opening position for opening the second exhaust passage 35 (a solid line position in FIG. 1) and a closing position for closing the second exhaust passage 35. It is composed of an actuator 38 (for example, a servo motor) which is driven between the position and the position (the position of the broken line in FIG. 1). Therefore, in the state in which the opening / closing valve 37 opens the second exhaust passage 35, the combustion gas generated in the combustion chamber 24 is discharged from the first exhaust passage 3
4 and the second exhaust passage 35 are exhausted and the on-off valve 37 closes the second exhaust passage 35.
The combustion gas generated in 4 flows only through the first exhaust passage 34 and is exhausted.

The hot water passage 25 is formed in a cylindrical shape on the outer circumference of the outer peripheral passage 34a of the first exhaust passage 34 so that the hot water circulating in the hot water circuit 13 flows along the outer peripheral wall surface of the outer peripheral passage 34a. There is. The heat exchanging fins 26 are provided on the wall surface of the first exhaust passage 34 on the side of the hot water passage 25 in the outer peripheral passage 34a, and the combustion gas flowing through the outer peripheral passage 34a and the hot water passage 2 are provided.
Promote heat exchange with hot water flowing through 5. The combustion heater 16 adjusts the amount of fuel supply and the amount of combustion air so that the combustion amount (heat generation amount) is "Hi", the combustion amount is "Lo", and the combustion stop is "OFF". It can be used by switching to stages.

The control device 4 has a microcomputer (not shown) built therein, and as shown in FIG. 3, an operation signal output from the air conditioner operation panel 39 and various detection means including a water temperature sensor 19 (not shown). ) Is input, and each damper (inside / outside air switching damper 6, outlet switching dampers 10 and 11, air mix damper 21), blower 2, refrigeration cycle, water pump based on a control program input in advance. 14, each device such as the combustion heater 16 (glow plug 23, combustion fan 28, fuel pump 33, actuator 38) is controlled.

The combustion heater 16 is set with a combustion stop temperature TUL for automatically stopping combustion to prevent overheat, and the temperature detected by the water temperature sensor 19 is set lower than the combustion stop temperature TUL. When it reaches TH or when it exceeds the high temperature set value TH, the engine is operated with the combustion amount "Lo" and the temperature detected by the water temperature sensor 19 is the low temperature set value TL (TL
When it decreases to <TH), the engine is operated with the combustion amount “Hi” (see FIG. 4).

Further, in the switchgear, the upper limit value TR (provided that TR ≤ ≤ the temperature detected by the water temperature sensor 19 is higher than the high temperature set value TH).
TUL) until the opening / closing valve 37 is in the second exhaust passage 35.
When the temperature detected by the water temperature sensor 19 exceeds the high temperature set value TH and reaches the upper limit value TR, the opening / closing valve 37 is driven to the open position where the second exhaust passage 35 is opened.

Next, the operation in the heating operation is shown in FIG.
Will be described with reference to. First, when the heating operation is started, the combustion heater 16 is set to "Hi" level, and the blower 2 is set to "Hi".
The operation is performed at each level, and the opening / closing valve 37 is driven to the closed position so as to close the second exhaust passage 35. As a result, the hot water circulating in the hot water circuit 13 due to the operation of the water pump 14 flows through the hot water passage 25 of the combustion heater 16 by heat exchange with the combustion gas passing through the outer peripheral passage 34 a of the first exhaust passage 34. After being heated, it is sent to the heater core 15 and radiates heat by heat exchange with the air blown into the vehicle interior.

In this way, the combustion amount of the combustion heater 16 is set to the "Hi" level, and all the generated combustion gas is caused to flow through the first exhaust passage 34, whereby the amount of heat exchange with the hot water is maximized. Therefore, even if the blower level of the blower 2 is set to “Hi”, the amount of heat absorbed (heat amount) by heat exchange with the combustion gas is larger than the amount of heat released by the heater core 15,
The temperature of the hot water circulating in the hot water circuit 13 rises.

After that, when the temperature detected by the water temperature sensor 19 reaches the high temperature set value TH due to the temperature rise of the hot water, the combustion amount of the combustion heater 16 is switched from "Hi" to "Lo". In this case, the amount of heat released by the heater core 15 is larger than the amount of heat absorbed by the heat exchange with the combustion gas of the hot water, so that the temperature of the hot water circulating in the hot water circuit 13 decreases. When the temperature detected by the water temperature sensor 19 decreases to the low temperature set value TL due to the decrease in the temperature of the hot water, the combustion amount of the combustion heater 16 is switched from "Lo" to "Hi" again.

As described above, the blower level of the blower 2 is set to "H".
When used in “i”, the temperature of hot water circulating in the hot water circuit 13 is detected by the water temperature sensor 19 by fixing the open / close valve 37 to the closed position and controlling the combustion amount of the combustion heater 16 as described above. The temperature can be maintained between the high temperature setpoint TH and the low temperature setpoint TL.

After that, the blower level of the blower 2 is set to "Hi".
→ When switched to “Lo”, the amount of heat radiated in the hot water heater core 15 decreases, so that the hot water circulating in the hot water circuit 13 changes the combustion amount of the combustion heater 16 from “Hi” to “Lo”.
The temperature rises even when switched to. Therefore, the water temperature sensor 19
When the detected temperature exceeds the high temperature set value TH and reaches the upper limit value TR, the opening / closing valve 37 is driven to the open position where the second exhaust passage 35 is opened. As a result, the combustion gas generated in the combustion chamber 24 is exhausted through both the first exhaust passage 34 and the second exhaust passage 35, so that the flow rate of the combustion gas passing through the first exhaust passage 34 decreases. As a result, the amount of heat exchange between the combustion gas flowing in the first exhaust passage 34 and the hot water flowing in the hot water passage 25 decreases, so that the temperature of the hot water circulating in the hot water circuit 13 decreases.

Then, when the temperature detected by the water temperature sensor 19 decreases from the upper limit value TR to the high temperature set value TH due to the decrease in the temperature of the hot water, the open / close valve 37 is driven to the closed position again, and the hot water temperature rises again. . In this way, when the blower level of the blower 2 is used at “Lo”, the combustion amount of the combustion heater 16 is set to “Lo” and the opening / closing valve 37 is controlled to open / close to circulate in the hot water circuit 13. The temperature of the hot water can be maintained at a temperature detected by the water temperature sensor 19 between the high temperature set value TH and the upper limit value TR.

(Effect of Embodiment) In this embodiment, the blower 2
Even if the blast level of is switched from "Hi" to "Lo" to reduce the heat radiation amount in the heater core 15, the temperature detected by the water temperature sensor 19 cannot reach the combustion stop temperature TUL by controlling the opening / closing valve 37. Instead, the hot water temperature can be maintained between the high temperature set value TH and the upper limit value TR at the temperature detected by the water temperature sensor 19. As a result, it is not necessary to stop the combustion heater 16 to prevent overheating as in the conventional case,
Warm air can be stably supplied to the vehicle interior.

Next, a second embodiment of the present invention will be described. FIG. 5 is a sectional view of the heating device according to the second embodiment. The heating device of the present embodiment directly heats the air flowing in the duct 3 by the combustion heater 16 without using hot water as a heat medium. As shown in FIG. 5, the combustion-type heater 16 is arranged in a substantially central portion in the duct 3,
The air flowing around the outer periphery of the combustion heater 16 is heated by heat exchange with the combustion gas flowing through the outer peripheral passage 34a of the first exhaust passage 34. It should be noted that the heat exchange fins 26 have the outer peripheral passages 34a.
Is provided on the outer peripheral side, that is, on the air side flowing in the duct 3.

This heating device is equipped with a gas temperature sensor 40 (gas temperature detecting means of the present invention) for detecting the temperature of the combustion gas flowing through the first exhaust passage 34, and based on the temperature detected by this gas temperature sensor 40, The combustion amount of the combustion heater 16 and the operation of the opening / closing device are controlled. Specifically, the temperature detected by the water temperature sensor 19 can be read as the temperature detected by the gas temperature sensor 40 and controlled by the control method shown in FIG. Thus, as in the first embodiment, even if the ventilation level of the blower 2 is switched from "Hi" to "Lo" to reduce the heat radiation amount in the heater core 15, the on-off valve 37 is controlled to open and close to prevent overheating. Therefore, it is not necessary to stop the combustion heater 16, and it is possible to stably heat the vehicle interior.

[Modification] In the above-described embodiment, the blower 2 has three levels of air blowing level: "Hi", "Lo", and "OFF".
The combustion amount of the combustion heater 16 is set to "Hi", "Lo", "O".
I explained an example of switching to three stages of "FF" and using it,
It is also possible to reduce the fluctuation of the hot water temperature by making it possible to switch to four or more stages.

Further, when the blower 2 is operated at the "Lo" level, the opening / closing valve 37 is controlled to be driven to the closed position when the temperature detected by the water temperature sensor 19 decreases from the upper limit value TR to the high temperature set value TH. However, the opening / closing valve 37 may be controlled to be driven to the closed position after the upper limit value TR is lowered to the low temperature set value TL.

In the present embodiment, the heating device is combined with the cooling device (refrigeration cycle) to form the vehicle air conditioner 1, but it may be combined with another heating device (for example, a heat pump refrigeration cycle).

[Brief description of drawings]

FIG. 1 is a sectional view of a heating device (first embodiment).

FIG. 2 is an overall configuration diagram of a vehicle air conditioner.

FIG. 3 is a block diagram relating to the control system of the first embodiment.

FIG. 4 is a time chart showing a control example of the first embodiment.

FIG. 5 is a sectional view of a heating device according to a second embodiment.

FIG. 6 is a time chart showing a control example of a combustion heater according to a conventional technique.

[Explanation of symbols]

 2 blower 3 duct 4 control device (control means) 13 hot water circuit (circulation circuit) 14 water pump 15 heater core 16 combustion type heater (combustion device) 19 water temperature sensor (heat medium temperature detection means) 26 heat exchange fin (heat exchange means) ) 34 first exhaust passage 35 second exhaust passage 37 open / close valve (open / close means) 38 actuator (open / close means) 40 gas temperature sensor (gas temperature detection means)

Claims (7)

[Claims] 1. A duct for introducing air into a vehicle compartment; b) a blower for introducing air into the duct to send the air into the vehicle compartment; and c) a heat medium arranged in the duct and flowing inside. A heater core that heats the air sent from the blower by heat exchange with, d) a circulation circuit in which a heat medium circulates through the heater core, e) a pump that circulates the heat medium in this circulation circuit, and f) A combustion device for combusting fuel; g) a first exhaust passage and a second exhaust passage through which the combustion gas generated in this combustion device is exhausted; h) a combustion gas flowing in the first exhaust passage and the circulation circuit. Heat exchanging means for exchanging heat with the heat medium flowing through, i) opening / closing means for opening / closing the second exhaust passage, j) heat medium temperature detecting means for detecting the temperature of the heat medium flowing in the circulation circuit, k ) This heat medium temperature detection hand A heating device for an automobile, comprising: a control unit that controls the opening / closing unit based on a detected temperature of a stage. 2. A) a duct for introducing air into the vehicle compartment, b) a blower for introducing air into the duct to send the air into the vehicle compartment, c) a combustion device for burning fuel, and d) this combustion. A first exhaust passage and a second exhaust passage through which the combustion gas generated by the device is exhausted; and e) a blower blown from the blower by heat exchange with the combustion gas flowing in the first exhaust passage and arranged in the duct. Heat exchange means for heating the taken air, f) opening / closing means for opening / closing the second exhaust passage, g) gas temperature detecting means for detecting the temperature of the combustion gas flowing in the first exhaust passage, h) this A heating device for an automobile, comprising: a control unit that controls the opening / closing unit based on a temperature detected by a gas temperature detecting unit. 3. The control means controls the opening / closing means to close the second exhaust passage when the temperature detected by the heat medium temperature detecting means is lower than a predetermined temperature, and the heat medium temperature detecting means detects the temperature. When the temperature reaches the predetermined temperature, the second
The vehicle heating system according to claim 1, wherein the opening / closing means is controlled so as to open the exhaust passage. 4. The control means controls the opening / closing means so as to close the second exhaust passage when the temperature detected by the gas temperature detecting means is lower than a predetermined temperature. The vehicle heating system according to claim 2, wherein the opening / closing means is controlled to open the second exhaust passage when the predetermined temperature is reached. 5. The heating system for an automobile according to claim 1, wherein the heat medium temperature detecting means detects the temperature of the heat medium before the heat exchange with the combustion gas in the heat exchanger. . 6. The heating system for an automobile according to claim 1, wherein the blower has a variable blowing capacity. 7. The heating system for an automobile according to claim 1, wherein the combustion device varies a combustion amount.