JPH0613251B2 - Vehicle heating system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle heating device equipped with a heater capable of operating independently of an engine.

[Conventional technology]

Conventionally, as a vehicle heating device, Japanese Patent Laid-Open No. 60-2520
No. 18, Japanese Utility Model Publication No. 61-59876, and the like are disclosed.

What is described in JP-A-60-252018 will be outlined with reference to FIG. In the vehicle heating system shown in FIG. 5, a burner device 104 for burning fuel in the intake pipe 103 is provided in the engine 101, a heat exchanger 105 is provided downstream of the burner device 104, and the burner device 10 is provided.
The heat generated by burning the fuel in 4 is applied to the heat exchanger 105.
The collected heat is used as a heat source for heating.

No. 6 described in Japanese Utility Model Publication No. 61-59876.
Outline with reference to the figure. The engine warm-up device shown in FIG. 6 is provided with an intake bypass circuit 4 in parallel with the intake pipe 3 of the engine 1. The intake bypass circuit 4 includes a combustor 5 and a vehicle heater unit 9. The heat exchangers 8 that communicate with each other are sequentially installed, and a pressure regulating valve 12 is provided in the intake pipe 3 that bypasses the intake bypass 4. The combustor 5 is connected to a fuel injection pump 10 attached to the engine 1 by a fuel pipe 6 and burns fuel from the fuel tank 11 in the intake bypass 4. Regarding the heat exchanger 8, its air outlet side is connected to a heater unit 9 of the vehicle so that warm air heated by heat exchange by combustion gas of a burner having a vaporizer 7 flows into the heater unit 9. To do. A check valve 15 such as a reed valve is installed on the downstream side of the heat exchanger 8 of the intake bypass 4 and upstream of the confluence of the intake bypass 4 with the intake pipe 3. The intake air is not introduced into the intake bypass 4 from the downstream side. In the intake pipe 3 that bypasses the intake bypass 4,
The pressure regulating valve 12 is installed. This pressure regulating valve 12 is installed in order to always maintain a constant pressure difference between the intake pipe 3 before and after the pressure regulating valve 12, and the pressure regulating valve 12 has an arm 12b attached to its rotating shaft 12a, and this arm 12b is attached to a diaphragm. It communicates with a rod 13c protruding from a diaphragm 13a of the die actuator 13. The spring chamber 13b of the actuator 13 is connected to the negative pressure sensor 14 installed in the intake pipe 3 on the downstream side of the pressure regulating valve 12 by the communication pipe 13d so that the pressure on the downstream side of the pressure regulating valve 12 is introduced into the spring chamber 13b. To

The engine warm-up device configured as described above operates as follows. Immediately after the cold start of the engine 1, the intake air flows through the intake bypass 4 by the action of the pressure regulating valve 12, so that at this time, the burner of the combustor 5, that is, the vaporization device 7 is ignited to heat the intake air. The intake air thus heated warms the air for indoor heating by the heat exchanger 8 and is introduced into the engine 1 from the intake manifold 2 to enhance the warm-up property of the engine 1. In this state, the pressure regulating valve 12 is operated by the negative pressure sensor 14
It is driven by the actuator 13 in accordance with the detected pressure. That is, when the pressure on the downstream side of the pressure regulating valve 12 is low, the pressure in the spring chamber 13b becomes low, so the diaphragm 13
a swells toward the spring chamber 13b, pulls the rod 13c into the actuator 13, opens the pressure regulating valve 12, and causes a large amount of intake air to flow toward the intake pipe 3 to increase the pressure on the downstream side of the pressure regulating valve 12, and vice versa. When the pressure on the downstream side of the pressure regulating valve 12 increases, the pressure in the spring chamber 13b increases, so that the diaphragm 13a swells to the opposite side of the spring chamber 13b and pushes out the rod 13c from the inside of the actuator 13.
2 is closed and the amount of intake air flowing through the intake pipe 3 is reduced to lower the pressure on the downstream side of the pressure regulating valve 12. Regulator valve 1
By the above-mentioned operation of No. 2, the pressure difference between the inlet portion and the outlet portion of the intake bypass 4 is always kept constant, so that the change of the intake air amount due to the change of the engine rotation is not affected and the combustor 5
The burner burns stably without blowing out. Also,
By providing the check valve 15 in the vicinity of the confluence portion with the intake pipe 3 on the outlet side of the intake bypass 4, the backfire of the engine 1 and the reverse flow of intake air due to intake pulsation exceed the check valve 15 and bypass the intake bypass. There is no backflow in the path 4. Therefore, the flame of the burner is stably burned without being blown out, and it is possible to improve warm-up of the engine 1 and achieve rapid indoor heating.

[Problems to be solved by the invention]

However, in the vehicle heating system and the engine warm-up system as shown in FIGS. 5 and 6, the combustion gas is introduced into the intake pipe of the engine after passing through the heat exchanger of the heater, and The combustion air sent to the combustor is taken from the air cleaner for the engine.
In particular, in the engine warm-up device shown in FIG. 6, if the combustion gas from the heat exchanger 8 is to be released to the atmosphere, the intake pipe 3 has a lower pressure than the combustion gas passage, so that the combustion gas flows backward. There is a problem of doing.

An object of the present invention is to solve the above problems, and when the combustion gas generated in the combustor of the heater is sent to the engine, relatively clean combustion air is sent to the combustor. , When releasing combustion gas to the atmosphere, take in combustion air from an air cleaner that is rough and has low suction resistance.
It is an object of the present invention to provide a vehicle heating device that reduces power consumption of a blower and prevents backflow of combustion gas.

[Means for solving problems]

The present invention is configured as follows in order to solve the above problems and achieve the above objects. That is, the present invention takes in combustion air from the first air cleaner for the engine when the combustion gas generated in the heater including the combustor and the heat exchanger is discharged to the intake pipe of the engine, and the combustion gas is also taken in. When the air is discharged to the atmosphere, it is controlled so that the combustion air is taken in from the second air cleaner, which is rougher than the first air cleaner. A switching valve is used to connect the first air cleaner or the second air cleaner to the combustor, and a switching valve is installed in a combustion gas passage located downstream of the heat exchanger to transfer the combustion gas to the intake pipe or the intake pipe. A blower is installed in the combustion air intake passage leading to the atmosphere and leading to the combustor, so that the combustion gas of the heater is released to the atmosphere when the engine is stopped. It relates to a vehicle heating device, characterized in that it is your.

[Action]

The vehicle heating device according to the present invention is configured as described above and operates as follows. That is, the present invention takes in combustion air from the first air cleaner for the engine when the combustion gas generated in the heater including the combustor and the heat exchanger is discharged to the intake pipe of the engine, and the combustion gas is also taken in. When the air is released into the atmosphere, the combustion air is added to the first
Since it is controlled so as to be taken in from the second air cleaner, which is rougher than the air cleaner, the combustion air is taken in from the first air cleaner for the engine when the combustion gas is sent to the engine, and the combustion air is relatively clean. In the case of not containing impurities, does not adversely affect the engine, and when the combustion gas is released to the atmosphere, the combustion air is taken in from the second air cleaner provided separately to clean the air so much. Therefore, the filter of the air cleaner may be a rough one with low intake resistance, the blower may be a small one with low power consumption, and the combustion gas may flow from the combustion gas passage of the heater to the intake air of the engine. There is no backflow into the tube. Since the communication between the first air cleaner or the second air cleaner and the combustor is performed by a switching valve, and a switching valve is installed in the combustion gas passage located downstream of the heat exchanger,
The operation is reliable, and the flow of the combustion gas and the combustion air can be controlled accurately and quickly. Further, since the combustion gas is released to the intake pipe or the atmosphere, the heater can be operated regardless of the operation of the engine.

〔Example〕

Hereinafter, an embodiment of a vehicle heating device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a basic schematic diagram of a vehicle heating system according to an embodiment of the present invention. Since this vehicle heating device has a part having the same configuration as that of the engine warm-up device described with reference to FIG. 6, the same components are designated by the same reference numerals, and their configurations are omitted. Will be omitted and only different configurations will be described. A first air cleaner 24 for the engine is provided upstream of the intake pipe 3 of the engine 1. A switching valve 19 is installed at the branch portion where the intake bypass 4 is connected to the intake pipe 3, and the combustion air passage 17 of the second air cleaner 23 is connected to the intake bypass 4. Switching valve 19
Is switched so as to open and close the communication state between the intake pipe 3 and the intake bypass circuit 4 and the communication state between the combustion air passage 17 of the second air cleaner 23 and the intake bypass circuit 4. Further, a blower 31 is installed in the intake bypass 4. A switching valve 25 is installed in the combustion gas passage 16 downstream of the heat exchanger 8, and the switching valve 25 is switched to the combustion gas passage 18 which is open to the atmosphere or the combustion gas passage 16 which communicates with the intake pipe 3. In the figure, A indicates the flow direction of combustion air, B indicates the flow direction of combustion gas, F indicates the flow direction of fuel, and H indicates the flow direction of heating air in the vehicle.

2 and 3 show an example of the case where the vehicle heating system according to the present invention is applied to a vehicle together with the control system thereof, and the quick heating system QH is used as the heater.
S is installed. The quick heating device QHS can rapidly heat the room by using a combustor and a heat exchanger described later. FIG. 2 is an overall schematic diagram including a control device, and FIG. 3 is an enlarged view of a main part.
Further, regarding the parts in the vehicle heating system shown in FIGS. 2 and 3, the same parts as those in the basic vehicle heating system shown in FIG. 1 are designated by the same reference numerals. . The combustor 5 is configured to vaporize the liquid fuel by the vaporizer 7 to generate vaporized fuel, burn the vaporized fuel, and send the combustion gas to the heat exchanger 8. The intake pipe 3 of the engine 1 and the combustion air passage 17 for introducing the combustion air into the combustor 5 of the heater are connected by the intake bypass circuit 4. A first air cleaner 24 for the engine is provided upstream of the intake pipe 3, and the first air cleaner 24 has a function of relatively cleaning the air. A second air cleaner 24 having a different function from the first air cleaner 24 is provided upstream of the combustion air passage 17.
An air cleaner 23 is provided. The second air cleaner 23 is composed of a filter having a relatively rough or coarse mesh, and has a low air suction resistance. Therefore, the suction force of the blower 31 can be small, and the power consumption of the blower 31 can be small. . A switching valve 19 is installed at a branch portion between the intake bypass 4 and the combustion air passage 17. Further, in order to achieve the same function as that of the vehicle heating system shown in FIG. 1, in the vehicle heating system shown in FIG. 2, the switching valve 25 for engine suction and the switching valve 27 for opening to the atmosphere are opened and closed. While operating, the switching valve 26 for keeping the engine temperature and the switching valve 40 installed in the combustion gas passage 39 are set to the closed state.

In the figure, 41 is an exhaust brake switching valve for blocking the flow of exhaust gas and increasing the braking force, and 43 is whether or not the exhaust gas generated in the heater, that is, the combustion gas is sent to the intake pipe 3 of the engine 1. Is an engine suction instruction switch for manually instructing the operation of the engine, 44 is an operation switch of the quick heating system QHS, 45 and 47 are temperature sensors, and 48 is an outer surface of the engine 1 to keep the engine 1 warm, that is, a cylinder block and an oil pan. An operation switch for keeping the engine warm to send combustion gas to, etc., 50 is a main control device, 73 is a clutch on / off signal sensor for inputting a clutch on / off signal, and 74 is an accelerator free or is a little stepped on. Accelerator signal sensor that emits a signal whether it is rare, 75 is a starter, 76 is an engine starter etc. installed in the driver's seat A switch, 77 is a silencer, 78 is an air tank for storing the air compressed by the engine 1, etc., 79 is a temperature sensor for detecting the temperature of heating air sent into the cap, 80 is a battery, 81 is a timer set by the user, Reference numerals 82 and 82 denote exhaust brake operation switches for inputting the operation of the exhaust brake.

Next, although details of the combustor 5 and the heat exchanger 8 are not shown, it is preferable to use those having the following configurations, for example. An example of these will be described in detail with reference to FIG.

First, the heat exchanger 8 will be described. An air blower 36 is installed upstream of the heat exchanger 8 through an air intake pipe. A suction duct 37, which is a circulation air intake passage, is attached to the suction port of the blower 36. Suction duct 37
Is configured to take in heating air from the vehicle interior 28 or outside the vehicle, and may be configured to become gradually narrower toward the downstream side, or may be a simple circulation pipe. Although not shown, the heat exchanger 8 can be configured to have a structure in which the heat absorption passage cylinder is arranged on the outer periphery of the heat passage cylinder that is a double cylinder. The heat flow passage tube body is composed of a heat flow outward path tube body and a heat flow return path tube body arranged on the outer periphery thereof. A combustor 5 is attached to one end of the heat flow outward tube. Therefore, the heat exchanger 8 radiates the heat flow passage through which the combustion gas from the combustor 5 passes in the central portion, the heat transfer passage through which the combustion heat of the combustion gas is transmitted to the outer peripheral side in the middle portion, and the heat radiation in the outer portion. It is composed of an endothermic passage that turns cold air into warm air. Moreover, the heat flow passage, the heat transfer passage, and the heat absorption passage are arranged coaxially with each other. The heat absorption passage cylinder constitutes an outer case of the heat exchanger 8 and is covered with a heat insulating material or the like. At both ends of the outer case, an air intake pipe 21 is attached to one end and a bending pipe is attached to the other end, and the bending pipe is connected to the warm air suction duct 22.
A cup-shaped lid with fins is fixed to the end of the heat flow return tube. With this structure, the flow passage of the combustion gas, that is, the heat flow passage and the heat transfer passage, and the flow passage of the air that is heat-exchanged for heating are completely cut off. Further, the other end of the heat-flow-outgoing tube and one end of the heat-flow-returning tube communicate with each other, and the other end of the heat-flow-returning tube has an exhaust pipe provided with a combustion gas outlet, that is, a combustion gas. A passage 16 is attached. The combustion gas is sent to the intake pipe 3 of the engine 1, sent to the outer periphery of the engine 1 or a suitable place to keep the temperature of the engine 1 open to the atmosphere. Further, a large number of heat receiving fins are arranged in the heat flow return tube body. Further, a large number of heat radiation fins are arranged in the heat absorption passage cylinder. From the viewpoint of heat conduction, it is preferable that the heat receiving fins and the heat radiating fins are integrally provided in the heat flow return tube body. In other words, heat receiving fins are formed inside the heat flow return path tubular body, and radiating fins are formed outside the heat flow return path tubular body.

Next, the combustor 5 will be described. The combustor 5 is composed of a combustion cylinder. The combustion cylinder is divided into a vaporization chamber and a combustion chamber by a partition plate having a communication hole, and a vaporization device 7 having a vaporization glow plug 30 therein is arranged so as to penetrate the combustion chamber. An ejection port for ejecting vaporized fuel vaporized by the vaporization device 7 is opened in the vaporization chamber, and an ignition glow plug 29 is arranged in the vaporization chamber. The vaporization glow plug 30 vaporizes the liquid fuel into vaporized fuel, and also takes in combustion air to generate vaporized fuel and a mixture, and the ignition glow plug 29 for slightly existing oil droplets or mixture.
Is ignited to burn the mixture in the combustion chamber. By using such a combustor 5, the liquid fuel is rapidly vaporized to vaporized fuel, and the vaporized fuel is rapidly ignited or ignited to enable rapid combustion. As a result, the combustor 5 can immediately send the combustion gas to the heat exchanger 8, can quickly perform the function of the heat exchanger 8, and can be used for heating.

The vehicle heating device according to the present invention is configured as described above and operates as follows. Regarding the operation of the vehicle heating device, the basic operation conditions will be described first. In the vehicle heating system shown in FIG. 1, the switching valve 19 and the switching valve 25 are set so that the heater including the combustor 5 and the heat exchanger 8 can be independently operated even when the engine 1 is stopped. It was done. The calorific value obtained in the combustor 5, that is, the combustion gas, is sent to the heat exchanger 8 and, after heat exchange, is sent to the intake pipe 3 of the engine 1 or the combustion gas passage 18 open to the atmosphere through the combustion gas passage 16. Is configured. First, when the engine 1 and the heater are operating at the same time, and moreover, when the combustion gas generated in the combustor 5 of the heater is to be sucked into the engine 1, the switching valve 19 and the switching valve 25 are connected to the intake pipe 3. On the other hand, control is performed to switch to the open side. In this state, the combustion gas smoothly flows under the control of the pressure regulating valve 12 and the diaphragm type actuator 13 regardless of the operating state of the blower 31. Further, even when the engine 1 is stopped, the switching valve 19 is opened to the intake pipe 3, the switching valve 25 is closed to the intake pipe 3 and to the combustion gas passage 18 which is open to the atmosphere. To control. Blower 31 in this state
The combustion gas smoothly flows into the atmosphere by the action of. However, if the engine 1 is operated and the switching valve 19 is opened to the intake pipe 3 and the switching valve 25 is closed to the intake pipe 3 so as to be opened to the combustion gas passage 18 communicating with the atmosphere. For example, the suction negative pressure in the intake pipe 3 is, for example, 650 mmAq. Therefore, unless a blower 31 having a considerably large capacity is used, the combustion gas flows backward. In order to solve this problem, the vehicle heating device according to the present invention is solved by controlling as follows. That is, engine 1
And the heater are operating at the same time, the opening direction of the switching valve 25 and the rotation state of the engine 1 are detected according to the passenger's instruction. When these signals give the signal that the engine 1 is rotating and the switching valve 25 is open to the atmosphere side, the switching valve 19 is closed to the intake pipe 3 and the second air cleaner 23 side is opened. To control. The second air cleaner 23 is rougher than the first air cleaner 24 and has a low suction resistance.
The suction resistance of the blower 31 is reduced, and the blower 31 itself can be downsized. Therefore, the power consumption of the blower 31 can be reduced. Further, as another control of the heater, the switching valve 19 is operated by detecting the rotation of the switching valve 25 and the engine 1, but it is set in advance by sensing the negative pressure level in the intake pipe 3. It is also possible to control the switching valve 19 to switch to the second air cleaner 23 by comparing with the suction capacity of the blower 31 that is present.

Regarding the heating apparatus for a vehicle according to the present invention, the operating conditions of the switching valves 19 and 25 under the respective operating conditions are shown as a representative example as follows.

(I) When starting the engine 1 in the summer, when only the engine 1 is operated without assisting the quick heating system QHS, the pressure regulating valve 12 is fully opened and the switching valve 19 is closed.

(II) When the engine 1 is started in the winter, the quick heating system QHS is assisted, and when the combustion gas is sucked into the engine 1 by idling of the engine 1, the switching valve 19 and the switching valve 25 are opened.

(III) When the engine 1 is stopped and the quick heating device QHS is operated independently, the switching valve 19 is opened and the switching valve 25 is closed to set the combustion gas passage 16 to the combustion gas passage 1
Open to the atmosphere side through 8.

(IV) When operating the engine 1 and independently operating the quick heating system QHS, the switching valve 19 and the switching valve 25
Is closed, the combustion air is taken in from the second air cleaner 23, and the combustion gas passage 16 is communicated with the combustion gas passage 18 and opened to the atmosphere side.

(V) When the quick heating system QHS is operating and the engine 1 is operating the exhaust brake, the switching valve 1
9 is closed, the switching valve 25 is opened, and combustion gas is sent to the intake pipe 3.

Next, the quick heating device Q shown in FIG. 2 and FIG.
The operation of the vehicle heating system according to the present invention equipped with the HS will be described. Further, the processing status of the operation will be described with reference to the flowchart shown in FIG.

First, the vehicle heating device according to the present invention is started.
(51) It is determined whether the operation switch 44 of the quick heating system QHS in the vehicle heating system including the combustor 5 and the heat exchanger 8 is on. If the operation switch 44 is not on, the process returns to the beginning. When the operation switch 44 is on, the process proceeds to the next process (53). (52) Each valve is in a state where the air in the air cylinder is not operated, and only the heater of the quick heating device QHS is set to be independently operable. Rapid heating system QHS
Various combustion-related parts such as blowers 31, 36, vaporization glow plug 30, ignition glow plug 29, and liquid fuel pump 32 are controlled. The liquid fuel pump 32 is operated to feed the liquid fuel from the liquid fuel tank 11 to the vaporizer 7. By operating these, liquid fuel is supplied to the combustor 3 and converted into vaporized fuel. The blower 31 is operated to send the combustion air to the combustor 5. The combustor 5 vaporizes the liquid fuel to produce vaporized fuel, and enters a combustion state. (53) By turning on various combustion-related parts of the quick heating system QHS,
Whether the liquid fuel is vaporized to become vaporized fuel and whether ignition has been completed is determined by the combustion gas outlet of the heat exchanger 8, that is, the combustion gas passage 16
The temperature of the combustion gas is detected and judged by the temperature sensor 34 installed at the inlet of the. For example, it is determined whether the temperature of the combustion gas is about 200 ° C. or higher. If it has not ignited, the process (53) is performed. When ignited, the process proceeds to the next process (55). (54) It is determined whether or not the combustion gas is sucked into the engine 1. When making the engine 1 suck the combustion gas, the engine suction instruction switch 43 for making the engine 1 suck the combustion gas is turned on. Engine suction instruction switch 4
If 3 is on, the process proceeds to the next process (56), and if not, the process proceeds to process (66). (55) When the combustion gas is sucked into the engine 1, the switching valve 25 for sucking the engine is opened. (56) The switching valve 19 is switched to the side where the intake bypass 4 opens to the intake pipe 3, that is, the side indicated by the solid line in FIG. 3, and the second air cleaner 23 side is closed. (57) The switching valve 26 for keeping the engine warm and the switching valve 27 for opening to the atmosphere are closed. (58) It is determined whether the exhaust brake operation switch 70 is on. When the exhaust brake operation switch 70 is on, the process proceeds to the next process (60), and when it is off, the process returns to the process (56). (59) Determine whether the clutch is on. When the clutch is on, the clutch signal sensor 73 is turned on. When the clutch is not turned on, the process returns to the process (56). (60) Whether the accelerator is free or stepped on is determined by the signal from the accelerator signal sensor 74. If the accelerator is free, the process proceeds to the next process (62). If the accelerator is not free, the process returns to the process (56).
(61) The switching valve 27 for opening to the atmosphere is opened to open the combustion gas to the atmosphere. (62) The switching valve 25 for engine intake is closed so that combustion gas is not sent to the intake pipe 3 of the engine 1. …
(63) The side where the intake bypass 4 is closed with respect to the intake pipe 3, that is, the third side
The switching valve 19 is switched to the side indicated by the dotted line in the figure, the second air cleaner 23 side is opened, and the combustion air for the combustor 5 is taken in from the second air cleaner 23.
...... (64) The discharge brake valve 41 and the muffler valve 42 for preventing blowback when the discharge brake operates are closed. (65) Various controls are performed by the driver here. Then
It is determined whether the operation switch 44 of the quick heating device QHS including the combustor 5, the heat exchanger 8 and the like is off. When the operation switch 44 is not off, the process returns to the step (55), and when the operation switch 44 is off, the next process (6) is performed.
Proceed to 7). (66) Controls the devices related to extinguishing the quick heating device QHS in the vehicle heating device to extinguish the quick heating device QHS.
(67) The switching valve 19 is switched to the side where the intake bypass 4 is closed with respect to the intake pipe 3, and the quick heating system QHS and the intake pipe 3 of the engine 1 are shut off. (68) The switching valve 27 for opening to the atmosphere is opened. …… (6
9) Close the switching valve 26 for keeping the engine warm. ......
(70) Close the engine intake switching valve 25. ......
(71) The control of the quick heating device QHS in the vehicle heating device ends. (72) When operating the quick heating system QHS, for example, if the combustor 5 and the heat exchanger 8 described above are used, the following operation is performed. The combustion gas generated by the combustor 5 is blown into the heat flow passage in the heat flow outward cylinder.
The combustion gas blown into the heat flow passage makes a U-turn while being guided by the lid from the heat flow passage of the heat flow outward passage tube, and flows through the heat transfer passage in the heat flow return passage tube body. Since a large number of heat receiving fins are provided in the heat transfer passage in the radial direction, the combustion gas is deprived of combustion heat by the heat receiving fins and finally discharged from the combustion gas discharge port to the combustion gas passage 16. On the other hand, the warmed air is sucked by the blower 36 through the suction duct 37, and the blower 36 heats the heat exchanger 8
It is blown into the heat-absorbing passage cylinder. The sent air flows through between the radiation fins installed in the heat absorption passage. A large number of radial radiating fins are fixedly arranged on the outer periphery of the heat flow return tube body in the heat absorbing passage, and air passes between the radiating fins to absorb or take away heat from the radiating fins. Be warmed. The warmed air becomes warm air, and then is further warmed and flows through the space between a large number of radiation fins radially provided on the outer periphery of the lid. Then
The warmed hot air is blown into the vehicle interior 28 from the hot air outlet 38 through the hot air outlet duct 22. The warm air keeps the inside of the vehicle warm, and then passes through the filter at the air intake port and is sucked into the suction duct 37 by the action of the blower 36. The sucked air is sent from the scroll outlet 21 of the blower 36, that is, the air intake pipe to the heat exchanger 8 through the air intake pipe again. The above operation is repeated and the inside of the vehicle is kept at a predetermined temperature.

Although one embodiment of the vehicle heating device according to the present invention has been described in detail, the present invention is not limited to the above detailed structure. That is, it goes without saying that various configurations can be applied to the combustor and the heat exchanger.
For example, as for the combustor, a glow plug that is a heating plug may be used to vaporize liquid fuel into vaporized fuel and ignite it. With respect to the heat exchanger, various shapes and structures, and the shapes and structures of the fins incorporated therein can be changed in various ways.

〔The invention's effect〕

Since the vehicle heating device according to the present invention is configured as described above, it has the following effects. That is, the present invention takes in combustion air from the first air cleaner for the engine when the combustion gas generated in the heater including the combustor and the heat exchanger is discharged to the intake pipe of the engine, and the combustion gas is also taken in. When the air is released into the atmosphere, the combustion air is controlled so as to be taken in from the second air cleaner, which is rougher than the first air cleaner. Therefore, when the combustion gas is sent to the engine, the combustion air is the first air for the engine. When the combustion air is taken in from the air cleaner and is relatively clean and does not contain impurities and does not adversely affect the engine and releases the combustion gas to the atmosphere, it is burned from a second air cleaner provided separately. Since it is not necessary to take in the air for cleaning and clean the air so much, a rough filter with a low suction resistance may be used for the air cleaner, and the blower can be used as a power source. It may be those small small expenses, yet the combustion gas is not such as to flow back from the combustion gas path of heaters to the intake pipe of the engine. The first air cleaner or the second
The communication between the air cleaner and the combustor is performed by a switching valve, and since the switching valve is installed in the combustion gas passage located downstream of the heat exchanger, the operation is reliable.
The flow of combustion gas and combustion air can be controlled accurately and quickly. Since the combustion gas is released to the intake pipe or the atmosphere, the heater can be operated regardless of the operation of the engine. The combustion gas generated in the combustor is sent to the engine or the exhaust pipe of the engine, which is extremely preferable for safety. Moreover, the structure is such that the passage for taking in the combustion air of the heater is connected to the intake pipe of the engine and the switching valve is installed, the structure is extremely simple, the operation is extremely simple, and there is a malfunction. Etc., various effects are exhibited, such as the occurrence of such problems and the ease of maintenance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a basic device of a vehicle heating device according to the present invention, and FIG. 2 is a structure of a vehicle heating device according to the present invention and an embodiment of its control device. FIG. 3 is a schematic view, FIG. 3 is an enlarged view of a main part of FIG. 2, FIG. 4 is a flowchart for explaining an operating state of the vehicle heating device according to the present invention, and FIG. 5 is a schematic view of a conventional vehicle heating device. FIG. 6 and FIG. 6 are schematic diagrams showing a conventional engine warm-up device. 1 ... Engine, 3 ... Intake pipe, 4 ... Intake bypass, 5
...... Combustor, 7 ... Vaporizer, 8 ... Heat exchanger, 16,
39 ... Combustion gas passage, 19, 25, 26, 27, 4
0, 41, 42 ... switching valve, 23 ... second air cleaner, 24 ... first air cleaner, 28 ... vehicle interior,
29 ... Ignition glow plug, 30 ... Vaporization glow plug, 31, 36 ... Blower, 50 ... Main control unit.

Claims (6)

[Claims] 1. When the combustion gas generated in the combustor of the heater is sent to the intake pipe of the engine, the combustion air is taken in from the first air cleaner for the engine, and the combustion gas is discharged to the atmosphere. The vehicle heating device is characterized in that the combustion air is controlled to be taken in from another second air cleaner. 2. The vehicle heating apparatus according to claim 1, wherein the second air cleaner is composed of a filter that is rougher than the first air cleaner. 3. The vehicle heating device according to claim 1, wherein the commutator is connected to the first air cleaner or the second air cleaner by a switching valve. 4. A switching valve is installed in a combustion gas passage located downstream of a heat exchanger of the heater, and the combustion gas is sent to the intake pipe or discharged to the atmosphere. The vehicle heating device as set forth in claim 1. 5. A blower is installed in a combustion air intake passage leading to the heater.
The heating system for a vehicle according to the item. 6. The vehicle heating apparatus according to claim 1, wherein the combustion gas of the heater is controlled so as to be released to the atmosphere when the engine is stopped.