JPH0613252B2 - 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. 4, a burner device 104 for burning fuel is provided in the intake pipe 103 of the engine 101, and a heat exchanger 105 is provided downstream of the burner device 104.
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. 5 described in Japanese Utility Model Publication No. 61-59876
Outline with reference to the figure. The engine warm-up device shown in FIG. 5 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. For the heat exchanger 8,
The air outlet side is connected to the heater unit 9 of the vehicle so that the warm air heated by the heat exchange by the combustion gas of the burner having the vaporizer 7 flows into the heater unit 9. On the downstream side of the heat exchanger 8 of the intake bypass circuit 4,
A check valve 15 such as a reed valve is installed on the upstream side of the confluence portion of the intake bypass 4 with the intake pipe 3 so that intake air from the intake pipe 3 side does not enter the intake bypass 4 from its downstream side. Constitute. A pressure regulating valve 12 is installed in a portion of the intake pipe 3 that bypasses the intake bypass circuit 4. This pressure regulating valve 12 is the pressure regulating valve 1
The pressure regulating valve 12 has an arm 12b attached to its rotating shaft 12a so that the arm 12b is projected onto the diaphragm 13a of the diaphragm type actuator 13. It communicates with the installed rod 13c. 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 13b so that the pressure on the downstream side of the pressure regulating valve 12 is introduced into the spring chamber 13b. To

[Problems to be solved by the invention]

However, in the vehicle heating system and the engine warming system as shown in FIGS. 4 and 5, 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 delivered to the combustor is taken from the engine air cleaner and is not a consideration for the flow of combustion gases when the exhaust brake is activated. Particularly, in the engine warm-up device shown in FIG. 5, the combustion gas from the heat exchanger 8 has a problem that when the exhaust brake operates, there is no place where the combustion gas flows out, and the combustion gas flows backward. There is.

An object of the present invention is to eliminate the above-mentioned problems, and immediately when the exhaust brake is actuated when the combustion gas generated in the heater, particularly in the combustor of the quick heating device is being sent to the engine, To provide a vehicle heating device in which a valve is operated to release combustion gas to the atmosphere, the combustion gas is prevented from flowing backward from the engine, and the combustor of the heater can continue combustion without abnormality. Is.

[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, according to the present invention, a switching valve is provided in either a combustion gas passage for discharging combustion gas generated in a heater to an intake pipe of an engine or a combustion gas passage for discharging to the atmosphere in response to opening / closing operation of an exhaust brake valve. More specifically, the vehicle heating device is controlled to be switched. More specifically, the exhaust pipe upstream of a confluence point of the combustion gas passage of the heater and the exhaust pipe of the engine is connected to the exhaust pipe. A vehicle heating device, wherein the exhaust brake valve is installed, and a sound deadening valve is installed in the intake pipe downstream of a confluence point between the combustion gas passage of the heater and the intake pipe. Regarding

[Action]

The vehicle heating device according to the present invention is configured as described above and operates as follows. That is, according to the present invention, a switching valve is provided in either a combustion gas passage for discharging combustion gas generated in a heater to an intake pipe of an engine or a combustion gas passage for discharging to the atmosphere in response to opening / closing operation of an exhaust brake valve. Since it is controlled to switch, the switching valve is switched even if the exhaust brake is operated, the combustion gas of the heater is released to the atmosphere, and the combustion gas does not flow backward from the engine, and is independent of the engine. The combustor of the heater thus operated can continue combustion smoothly without abnormality.

〔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. This vehicle heating system is a vehicle equipped with a heater which is a quick heating system QHS. This quick heating system QHS mainly uses a blower 3
1, 36, the combustor 5 and the heat exchanger 8 are sequentially arranged, and the combustor 5 and the heat exchanger 8 of the type described later are applied. The combustor 5 has a vaporizer 7
Is installed, and the liquid fuel is sent from the fuel tank 11 to the vaporizer 7 through the fuel pump 32, the fuel filter 10, and the suction return valve 12. A first air cleaner 24 for the engine is provided upstream of the intake pipe 3 of the engine 1. A sound deadening valve 42 is installed in the intake pipe 3 downstream of the confluence 4 of the combustion gas passage 16 of the heater and the intake pipe 3. The intake pipe 3 downstream of the muffler valve 42 is connected to the intake manifold 2. Exhaust brake valve 41
In response to the opening and closing operation of the heater, switching is performed so that the combustion gas generated in the heater flows to either the combustion gas passage 16 for sending to the intake pipe 3 of the engine 1 or the combustion gas passage 18 for discharging to the atmosphere. A valve 25 is provided. An exhaust brake valve 41 is installed in the exhaust pipe 6 upstream of the confluence point 9 of the combustion gas passage 18 of the heater and the exhaust pipe 6 of the engine 1. The second air cleaner 2 is provided upstream of the blower 31.
3 is provided. 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, C indicates the flow direction of intake air of the engine 1, F indicates the flow direction of fuel, and H indicates inside the vehicle. FIG. 2 showing the flow direction of the heating air in FIG. 1 shows an example in which the vehicle heating device according to the present invention shown in FIG. 1 is applied to a vehicle together with its control device. Regarding the parts in the vehicle heating system shown in FIG. 2, the same parts as those in the vehicle heating system according to the present invention 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 combustion air into the combustor 5 of the heater are connected to separate air cleaners, that is, a second air cleaner 23 and a first air cleaner 24, respectively. Upstream of the intake pipe 3,
A first air cleaner 24 for the engine is provided,
The first air cleaner 24 has a function of relatively cleaning the air. A second air cleaner 23 having a function different from that of the first air cleaner 24 is provided upstream of the combustion air passage 17. The second air cleaner 23 may be made of a filter having a relatively rough or coarse mesh, in which case the suction resistance of the air is low, and therefore the suction force of the blower 31 is also small. The power consumption of 31 is also small. A switching valve 19 is installed at a branch portion between the intake bypass and the combustion air passage 17. Also, the first
In order to achieve the same function as the vehicle heating system shown in the figure, in the vehicle heating system shown in FIG. 2, the engine intake switching valve 25 and the atmosphere opening switching valve 2 are provided.
7, the switching valve 26 for keeping the engine temperature and the switching valve 40 for the combustion gas passage 29 are set to the closed state.

In the figure, 43 is an operation switch of the quick heating device QHS, and 44 is an engine heat-retaining device for manually introducing combustion gas to the outer surface of the engine 1 to keep the engine 1 warm, that is, the cylinder block, the oil pan, and the like. Activation switch,
Reference numerals 45, 47 and 79 are temperature sensors, 48 is an engine suction instruction switch for manually instructing whether or not the exhaust gas, that is, combustion gas is manually sucked into the intake pipe 3 of the engine 1, 50 is a main control device, and 71 is An air tank for storing the air compressed by the power of the engine 1 or the like, 72 a timer set by the user, 73 a clutch signal sensor for inputting an on / off signal of the clutch, and 74 a whether the accelerator is free or slightly depressed. The accelerator depression signal sensor that issues a signal of 75, 75 is a starter for starting the engine 1, 76 is a key switch such as an engine starter provided in the driver's seat, 77 is a silencer, and 78 is an exhaust brake valve 41 for operating an exhaust brake. Exhaust brake actuation switch to shut off, and 80 indicates a battery.

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

First, the heat exchanger will be described. A blower 36 is installed upstream of the heat exchanger 8 through the air intake pipe 21. A suction duct 37, which is a circulating air intake passage, is attached to the suction port of the blower 36. Suction duct 37
Is configured to take in the air inside the vehicle interior 28 or the air outside the vehicle interior, and may be configured to gradually narrow 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. The combustor 5 is attached to one end of the heat flow outward path tubular body. 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 blowing duct 22. A cup-shaped lid with fins is fixed to the end of the heat flow return tube. With this structure, a combustion gas flow passage, that is, the heat flow passage and the heat transfer passage,
The flow path of air that is heat-exchanged and used for heating, that is, the heat absorption path is 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. This combustion gas, as shown in FIG.
To the intake pipe 3, or to the outer periphery of the engine 1 or a suitable place to keep the temperature of the engine 1 open, or 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 ceramic combustion tube. The combustion tube is partitioned into a vaporization chamber and a combustion chamber by a partition plate having a communication hole, and a vaporization device 7 having a glow plug 30 for vaporization penetrates the combustion chamber. And an injection port for ejecting vaporized fuel vaporized by the vaporizer 7 is opened in the vaporization chamber, and an ignition glow plug 29 is installed in the vaporization chamber. The vaporization glow plug 30 vaporizes the liquid fuel into vaporized fuel, and also takes in combustion air to produce vaporized fuel and a mixture, which is ignited by a glow plug 29 for ignition of a slight oil drop or mixture. , Burning the air-fuel 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 immediately transfers the combustion gas to the heat exchanger 8
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 25 is 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. . 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,
Moreover, when the combustion gas generated in the combustor 5 of the heater is to be sucked into the engine 1, the switching valve 25 is controlled to switch to the open side with respect to the intake pipe 3. The combustion gas is sent to the engine 1 and completely combusted in the engine 1, which is extremely preferable in terms of safety. At this time, when the exhaust brake is operated, that is, the switching valve 41
And the muffler valve 42 is closed, the combustion gas fed into the intake pipe 3 from the combustion gas passage 16 loses its outlet, so that the combustion gas flows back. This back flow of the combustion gas affects the combustion state of the heater. In order to prevent this adverse effect, when the exhaust brake is operated, the switching valve 25 is immediately switched so that the combustion gas passage 16 downstream of the heat exchanger 8 is connected to the combustion gas passage 18 which is open to the atmosphere. To control. Regarding the installation location of the muffler valve 42, the muffler for the flow of the combustion gas should be taken into consideration when the connection point between the combustion gas passage 16 and the intake pipe 3, that is, the confluence portion, that is, the downstream side of the collecting portion 4, that is, the engine 1 side. It is preferable if
Needless to say, it may be located at any place in consideration of settings of various flow control valves. Further, when the heater is operating and the engine 1 is stopped, the switching valve 25 is controlled to be closed to the intake pipe 3 and open to the combustion gas passage 18 which is open to the atmosphere. In this state, the combustion gas smoothly flows to the atmosphere by the action of the blower 31.

Next, the operation of the vehicle heating system according to the present invention equipped with the quick heating system QHS shown in FIG. 2 will be described. Furthermore, referring to the flowchart shown in FIG.
The processing status of the operation of the main controller 50 will be described.

First, the vehicle heating device according to the present invention is started.
(51) Each valve is in a state where the air in the air cylinder is not operated, and only the quick heating device QHS is set to be independently operable. It is determined whether the operation switch 43 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 43 is not on, the process returns to the beginning. If the operation switch 43 is on, the process proceeds to the next process (53). (52) Energize the vaporization glow plug 30 and the ignition glow plug 29 of the combustor 5 in the quick heating system QHS.
(53) The liquid fuel pump 32 is operated to send 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. (54) 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. In addition, the heat exchanger 8 exchanges heat with the air that makes the combustion gas warm air, and the blower 36 that sends the warm air to the heat exchanger 8 is operated. (55) 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. When not ignited, various controls are performed again to ignite the combustor 5. If it ignites, proceed to the next process.
(56) It is determined whether the engine suction instruction switch 44 is on. When the engine suction instruction switch 44 is on,
The switching valve 25 for engine intake is opened, and the switching valve 26 for keeping the engine warm and the switching valve 27 for opening to the atmosphere are opened.
To close. If the engine suction instruction switch 44 is not on, the process proceeds to the process (62) described later. ......
(57) The rotation sensor 35 determines whether the rotation speed of the engine 1 is within a certain range, for example, 300 to 800 rpm. When the rotation speed of the engine 1 is in the above range, the process proceeds to the next process (59), and when it is out of the above range,
The process proceeds to the process (62) described later. (58) Determine whether the exhaust brake is working. It is determined whether the exhaust brake activation switch 70 is on.
If the exhaust brake operation switch 70 is on, the process proceeds to the next process (60), and if not, the process described later (6)
Proceed to 6). (59) The clutch signal sensor 73 determines whether or not the clutch is on. If the clutch is on, the process proceeds to the next process (61), and if not, the process proceeds to a process (66) described later. (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 proceeds to the process (66) described later. …
(61) If the accelerator is free, the switching valve 2 for opening to the atmosphere
Open 7 and release combustion gas to the atmosphere. …… (6
2) The switching valve 25 for sucking the engine is closed to prevent the combustion gas from being sent to the intake pipe 3 of the engine 1 and to shut off the reverse flow of the combustion gas so as not to occur. …
(63) The sound deadening valve 42 for preventing blowback is closed to the intake pipe 3 when the discharge brake is operated. ......
(64) Close the exhaust brake valve 41 to activate the exhaust brake. (65) The control of the quick heating system QHS in the vehicle heating system ends. (70) If the exhaust brake is not operated, the clutch is not on, or the accelerator is not free, the exhaust brake valve 41 is opened. (66) The muffler valve 42 is opened. (67) The switching valve 25 is opened so that the combustion gas of the heater can be introduced into the intake pipe 3 of the engine 1 so that the unburned combustion gas is completely combusted in the engine 1. …
(68) The switching valve 27 for opening to the atmosphere is closed. …… (6
9) The control of the quick heating device QHS in the vehicle heating device ends. (70) 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 is guided by the lid from the heat flow passage of the heat flow outward tube U
Turns and flows through the heat transfer passage in the heat flow return cylinder. 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 air to be warmed is sucked by the blower 36 from the suction duct 37, and is sucked from the blower 36 through the air inlet into the heat absorption passage tube body of the heat exchanger 8. The sent air flows through between the heat 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. Next, the warmed warm air is the warm air blowing duct 2
The hot air is blown out into the vehicle compartment 28 through the hot air outlet 38. The warm air keeps the inside of the vehicle warm, 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 passes from the scroll outlet 21 of the blower 36 through the air intake pipe again, and the heat exchanger 8
Sent to. By repeating the above operation, the interior of the vehicle is quickly warmed to a predetermined temperature and kept warm.

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, which is a heating plug, may be used as long as it vaporizes liquid fuel into vaporized fuel and ignites, and a vertical type, a horizontal type, or the like can be applied. 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, according to the present invention, the switching valve switches between the combustion gas passage for discharging the combustion gas generated in the heater to the intake pipe of the engine and the combustion gas passage for discharging to the atmosphere in response to the opening / closing operation of the exhaust brake valve. Therefore, even if the exhaust brake is actuated, the switching valve is switched to release the combustion gas of the heater to the atmosphere, and the combustion gas does not flow backward from the engine. Can continue burning smoothly without any abnormality. Further, the operation of the control device of the vehicle heating system is reliable, and the flow of the combustion gas and the 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. Further, whether the combustion gas of the heater is sent to the intake pipe of the engine or the exhaust pipe open to the atmosphere can be controlled by the switching operation of one switching valve, and the structure is extremely simple. There are few failures, and maintenance is easy. Moreover, the combustion gas generated in the heater is sent to the intake pipe or the exhaust pipe of the engine, which is extremely preferable for safety.

[Brief description of drawings]

FIG. 1 is a schematic view showing a basic device of a vehicle heating device according to the present invention, FIG. 2 is a schematic view showing a structure of a vehicle heating device according to the present invention and an embodiment of a control device thereof, FIG. FIG. 4 is a flow chart for explaining an operating state of the vehicle heating system according to the present invention, FIG. 4 is a schematic diagram showing a conventional vehicle heating system, and FIG. 5 is a schematic diagram showing a conventional engine warm-up system. 1 ... Engine, 3 ... Intake pipe, 5 ... Combustor, 6 ...
Exhaust pipe, 7 ... Vaporizer, 8 heat exchanger, 16, 17, 1
8 ... Combustion gas passage, 19, 25, 26, 27, 40,
41, 42 ... Switching valve, 23, 24 ... Air cleaner, 31, 36 ... Blower, 34 ... Temperature sensor, 3
5 ... Rotation speed sensor, 43 ... QHS operation switch for quick heating system, 44 ... Engine suction instruction switch, 50
...... Main controller, 73 …… Clutch signal sensor, 74
…… Accelerator pedal signal sensor, 78 …… Exhaust brake operation switch.

Claims (3)

[Claims] 1. A switching valve switches between a combustion gas passage for discharging combustion gas generated in a heater to an intake pipe of an engine and a combustion gas passage for discharging to the atmosphere in response to opening / closing operation of an exhaust brake valve. A vehicle heating system characterized by being controlled as described above. 2. The exhaust brake valve is installed in the exhaust pipe upstream of a confluence point between the combustion gas passage of the heater and the exhaust pipe of the engine. The vehicle heating device described. 3. A vehicle according to claim 1, wherein a sound deadening valve is installed in the intake pipe downstream of a confluence point between the combustion gas passage of the heater and the intake pipe. Heating system.