JPH06104411B2 - Heating burner device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating burner device used in a heating device for rapidly heating the interior of a vehicle driven by an internal combustion engine.

(Prior Art) Conventionally, the vehicle interior heating is performed by taking out the cooling water of the internal combustion engine through a hot water pipe, passing it through a heater body composed of a heater core, a blower, etc., and sending air to the heater body to heat it. Heating the room, or heating the room indoors by the amount of heat generated by burning the fuel in a separate burner irrespective of the internal combustion engine and guiding the combustion gas itself to the engine intake manifold (Japanese Patent Application No. 59
-106869) is used.

(Problems of the prior art) In such a method of utilizing the cooling water of the internal combustion engine for indoor heating, since the temperature rising rate of the cooling water is slow, it takes time for the heater body to send out warm air. However, the heating function of the heater is lost in the meantime. In particular, it takes 10 minutes or more for a gasoline engine and 20 minutes or more for a diesel engine until the internal combustion engine completes the heating function. During this time,
In cold regions, the interior of the vehicle is cold and it is necessary to wear protective gear, and the defroster that removes frost, ice and the like from the windows of the vehicle cannot operate sufficiently. Further, when the vehicle is traveling on a long downhill, the temperature of the cooling water drops and it cannot be supplied for heating. In particular, since the diesel engine is a compression ignition type engine, it is sensitive to the exhaust gas temperature or the cooling water temperature with respect to the engine load, and the above-mentioned drawbacks are remarkable. Also, the diesel engine
White smoke, which is the result of incomplete combustion, sensitive to combustion in cold weather,
Generation of odor is remarkable.

Further, among the latter heating methods that use fuel separately from the internal combustion engine, the proposal by Japanese Patent Application No. 59-106869 mentioned above is one in which fuel is heated and vaporized and burned by an ignition device to be used as a heating heat source. Yes, warm air for heating can be obtained early. But,
Since the proposed heating system rapidly vaporizes and burns the fuel, combustion must be stopped at the burner system unless the fuel is cut off rapidly when heating is stopped, and the engine operates at full load level. In the case of, the combustion air of the engine becomes insufficient, the output of the engine is reduced, and white smoke is emitted. Therefore, even if the fuel is rapidly shut off when the heating device is stopped, the fuel remains in the vaporizer or the like when shutting off, and the residual fuel is carbonized due to the high heat of the burner device, causing a pipe clogging.

(Object of the Invention) An object of the present invention is to solve the above-mentioned conventional drawbacks, recover unburned fuel in the vaporizer, and remove residual fuel when the fuel supplied to the heating burner of the rapid heating device is shut off. An object is to provide a heating burner device for burning.

(Summary of the Invention) According to the present invention, a heating burner having a fuel vaporizer for ejecting vaporized fuel into a combustion chamber, the suction means when the combustion of the heating burner is stopped, and energization control for a vaporizer glow plug of the fuel vaporizer are performed. There is provided a heating burner device having a control device for operating the heating burner device.

(Example) Next, the Example of this invention is described in detail using drawing.

FIG. 1 is a sectional view of the configuration of an embodiment of a heating burner device according to the present invention, and FIGS. 2 and 3 are operation explanatory diagrams thereof. Further, FIG. 4 is a block diagram of an automobile heating system using this embodiment.

As is apparent in the figure, the intake pipe 3 is connected to the air cleaner 2 of the diesel engine or the gasoline engine 1.
In the middle of the pipe section (air duct) leading to
And a heat exchanger 5 is provided downstream thereof. Also 51
Is a bypass passage for supplying combustion air to the engine 1. In FIG. 1, the outer periphery of the heating burner 4 is covered with a burner housing 41, two combustion chambers are provided inside, and the first combustion chamber 42 is in the upstream direction of the air flow and the second combustion chamber is in the downstream direction. A chamber 43 is formed, and a honeycomb passage 44 through which air can pass is formed between the two. Further, an air passage 45 is provided between the burner housing 41 and the two combustion chambers, and the air from the air cleaner 2 flows in from the air intake port 46, and passes through the air passage 45, and the peripheral wall of the second combustion chamber 43. The second combustion chamber 43 is passed through the air introduction passage 47 formed of a plurality of small holes penetrating the passage, and is further discharged to the downstream heat exchanger 5 via the combustion chamber outlet 48.

On the other hand, a part of the air from the air cleaner 2 passes through a plurality of air introduction holes 49 which are controlled by a bypass valve described later and faces the flow of air, and then enters the first combustion chamber 42 to generate vaporized fuel described later. The mixture is mixed, and the second combustion chamber 43 is passed through the honeycomb passage 44.
And the ignition glow plug 6 provided in the second combustion chamber 43.
Is ignited to generate high-temperature combustion gas, which is directed to the heat exchanger 5 together with the air passing through the air passage 45.

Then, a bypass valve 10 for controlling the flow rate of air entering the heating burner 4 is provided in the upstream direction of the heating burner 4, and when the opening degree of the bypass valve is 1, a predetermined small amount of air is taken into the heating burner 4, In the case of 2, a predetermined medium amount and in the case of opening 3, a predetermined large amount of air is taken into the heating burner 4. When the bypass valve is fully opened, the heating burner 4 is not taken into the heating burner 4, The heat exchanger 5 is bypassed, and the air from the air cleaner 2 reaches the engine 1. The control of the opening degree of the bypass valve 10 is performed by a command to a main control unit described later.

Next, the combustion chamber outlet 48 of the horizontally provided heating burner 4
A pipe-shaped vaporizer 7 is installed so as to penetrate from the bottom portion on the side to the center of the first combustion chamber 42, and vaporized fuel is ejected into the first combustion chamber 42 at the upper tip of the vaporizer 7. A spouting hole 72 is provided so as to penetrate therethrough. A vaporization glow plug 71 formed of a ceramic pipe is coaxially disposed inside the vaporization device 7, and the vaporization glow plug 71 is provided.
A resistance wire 73 having a positive temperature coefficient is buried in the central part of the. Further, a plurality of heat receiving fins 74 are provided in the vaporizer 7 at a portion where the vaporizer 7 penetrates the inside of the second combustion chamber 43 in order to receive the heat of the combustion gas generated in the second combustion chamber 43. The fuel passing through the gap between the inner surface of the vaporization device 7 and the vaporization glow plug 71 is heated. Reference numeral 8 denotes a fuel supply device for supplying the fuel delivered from the fuel pump 9 to the vaporization device 7, and is capable of supplying fuel in two systems, a fuel valve A81 having a small fuel flow rate and a fuel valve B81 'having a large fuel flow rate. Each of the fuel valve A81 and the fuel valve B81 'has an electromagnetic actuating member 82, 82' which operates electromagnetically and a piston portion 83, 83 'which sucks the fuel when the fuel is cut off. The fuel is sucked through the connecting pipes 85, 85 'communicating with the vaporizer 7 into the respective control chambers 84, 84' provided therein. Both the fuel valve A81 and the fuel valve B81 'normally operate so as to cut off the fuel supply by the coil springs 86, 86', and when the electromagnetic coils 87, 87 'provided in the fuel supply device 8 are energized, they are ferromagnetic. The electromagnetic actuators 82, 82 'composed of the body are sucked, and the fuel valve A81, the fuel valve B8
1'will open the fuel passage.

The operation of the fuel valve A81 will be described with reference to FIGS. 2 and 3. In FIG. 2, the electromagnetic coil 87 is energized and the electromagnetic actuating body 82 is attracted, so that the coil spring 86 is pressed and the fuel valve A81.
Indicates that the fuel passage is open. Here, when the electromagnetic coil 87 is de-energized, the restoring force of the coil spring 86 advances the fuel valve A in the direction of arrow A, and the movement of the piston portion 83 forms the rear portion of the piston portion 83 and the control chamber 84. Since the space to be expanded is expanded and the fuel in the connecting pipe 85 advances in the direction of the arrow B, when the other fuel valve B81 'is closed, the fuel inside the vaporizer 7 is sucked and the air is further ejected from the ejection port 72 to the vaporizer 7 After being sucked in, the fuel valve A81 is brought into the state shown in FIG. The fuel valve B81 'also operates in the same manner as above when the fuel passage is closed, and when the fuel valve A81 is closed, the fuel of the vaporizer 7 is sucked into the control chamber 84'.
Further, the introduction of air to the vaporizer 7 is the same.

Here, the operation related to the heating burner 4 will be described. When the fuel valve A81 or the fuel valve B81 'is opened and the fuel sent to the vaporizer 7 passes through the vaporizer 7, the vaporized glow which is energized is energized. It is heated by the plug 71 and becomes vaporized fuel and is ejected from the ejection hole 72 into the first combustion chamber 42. Since the heat receiving fins 74 receive heat from the second combustion chamber 43 when the combustion is continued, the vaporization of the fuel is further promoted. On the other hand, the air controlled by the opening degree of the bypass valve enters the first combustion chamber 42 through the air introduction hole 49, mixes with the vaporized fuel described above, and passes through the honeycomb passage 44 to form a combustible mixture. And enters the second combustion chamber 43. In the second combustion chamber 43, the combustible air-fuel mixture is ignited by the energized ignition glow plug 6 to generate flame and become high-temperature combustion gas, which is sent to the heat exchanger 5 provided downstream.

The heat exchanger 5 takes in new air from an intake air intake 11 communicating with the interior of an automobile that requires heating, and blows out hot air after the new air takes heat from the combustion gas to perform heat exchange.
It is equipped with a blower 13 that blows up to 12. The outlet
12 is a separate cooling water heater core for indoor heating 14
A hot air temperature sensor that blows out air at the outlet of the
15 is provided in the opening. The illustrated blower 16, evaporator for air conditioner 17, and hot water passage 18 are each member of a heating device using cooling water.

Reference numeral 19 denotes a controller, which controls the rotation signal GT from the generator 20 driven by the engine 1 and the operation switch 21.
An ON / OFF signal FS, a water temperature signal WS from the water temperature switch 22 that detects the cooling water temperature of the engine 1, a start position signal ST, an accelerator opening signal AS, and an engine load sensor that detects the load state of the engine 1. Load signal EL from 24
And a warm air temperature signal WA from a warm air temperature sensor 15 provided at the outlet 12, a heating signal WP from a heating position switch 25 operated by a driver, and an ignition plug for detecting the temperature of the ignition glow plug 6. A main controller 191 to which the plug temperature signal PS from the sensor 26 is input, and a bridge circuit 19 for controlling the vaporization glow plug 71 of the vaporizer 7 to the vaporization temperature of fuel.
2. A bridge circuit 193 for controlling the ignition glow plug 6 to an ignition temperature of a mixture of vaporized fuel and air, and a switch section 194.

The main control unit 191 has a computer configuration having a processing device, a memory, and an input / output interface.

The bridge circuit 192 includes three resistors that form the other side of the Wheatstone bridge with the resistance wire 73 that heats the vaporization glow plug 71 as one side, a comparator that detects the balance state of the Wheatstone bridge, and the comparator. Of the relay, which is turned on and off by turning on and off the resistance wire 73, so that the vaporization glow plug 71 has a vaporization temperature of fuel, for example, around 500 ° C. In addition, the bridge circuit 193 includes three resistors that form a resistance wire for heating the ignition glow plug 6 as one side and the other side of the Wheatstone bridge, and the Wheatstone bridge.
The ignition glow plug 6 comprises a comparator that detects the balance state of the bridge and a relay that operates by the output of the comparator, and the relay turns ON / OFF the energization of the resistance wire.
Is configured to have an ignition temperature of a mixture of vaporized fuel and air.

The switch unit 194 is a switch 19 that controls ON / OFF of the blower 13.
4a, switch 194 for controlling power supply to bridge circuit 192
b, a switch 194c that controls the power supply to the bridge circuit 193,
It has a switch 194d that controls the bypass valve 10 in the air passage and a switch 194e that controls the power supply to the preheating completion lamp 27. 28 is a power supply battery, and 29 is a key switch.

FIG. 5 is a flow chart showing an example of processing of the heating burner apparatus according to the present invention, and the processing will be described next.

When the key switch 29 is turned on, power is supplied to the main control unit 191 of the controller 19 and other accessory circuits.
The water temperature signal WS from the water temperature switch 22 is sent to the main controller 191.
It is judged whether the cooling water temperature has reached 10 ° C (step a). If the cooling water temperature is 10 ° C. or lower, the heating burner is used as the engine start assist device, so the main control unit 191 turns on the switch 194c to energize the ignition glow plug 6 via the bridge circuit 193. Switch 194a
Is turned off, the blower 13 is turned off, and the fuel supply device 8
To drive the fuel valve A81 by instructing the drive source 88 of the vaporizer 7
Fuel is supplied to the vaporization glow plug 71 via the bridge circuit 192 by turning on the switch 194b. Then, the start position signal ST from the key switch 29 is checked (step b), and if the key switch 29 is in the start position, the above operation is continued, and the key switch 29
If it is in the ON position and not in the start position, the switch 194e is turned on for several seconds to turn on the preheating completion lamp 27, and the completion of preheating is displayed to the driver. Then, with switch 194b
194c is turned off, and the power supply to the vaporization glow plug 71 and the ignition glow plug 6 is stopped.

When the key switch 29 is at the start position and the starter motor 23 is energized and the starter motor 23 is rotating, the rotation signal GT from the generator 20 is received by the main control unit 191, and the main control unit 191 receives the ignition glow. Check the temperature of the plug 6 (step C). That is, the temperature of the ignition glow plug 6 is maintained at a predetermined temperature, for example, around 800 ° C. when energized by the bridge circuit 193, but if the combustion of the fuel is sufficiently performed inside the heating burner 4, Since the temperature becomes higher than the predetermined temperature, the temperature can be detected by checking the resistance value of the resistance wire having a positive temperature coefficient. Therefore, when the plug temperature signal PS from the ignition plug sensor 26 having the temperature detecting function is input to the main control unit 191, and the temperature of the ignition glow plug 6 is 800 ° C. or higher, the combustion is sufficiently performed. Then, the ignition glow plug 6 and the vaporization glow plug 71 are deenergized by the switches 194c and 194b. The temperature check of the ignition glow plug 6 (step C) is repeated after a predetermined time t, and when the temperature is lower than 800 ° C., the ignition glow plug 6 is checked.
Then, returning to the flow of energizing the vaporization glow plug 71, the hot air generated by the combustion of the fuel is sent to the engine 1 to assist the start.

Next, it is determined whether or not the engine 1 is in self-driving by the input of the rotation signal GT from the generator 20 (step d). If the engine 1 is not in self-driving, the fuel valve B81 ′ with a large fuel flow rate is opened and The bypass valve 7 is opened to increase the air amount to increase the fuel combustion and increase the hot air amount to accelerate the start of the engine 1. When the engine 1 is operating by itself, the heating signal from the heating position switch 25
Check the position of WP (step e). If it is ON, check the load of the engine 1 to check the load signal EL from the load sensor 24 (step f). Switch 194a when the water temperature signal WS from the water temperature switch 22 is 80 ° C or less.
The blower 13 is energized via the heat exchanger 5 to blow out the hot air having undergone heat exchange in the heat exchanger 5 from the outlet 12 to start heating (step g). Then, in steps e, f, g, the heating signal
When WP is OFF, when the engine load is large and is more than 1/2 of the total load, or when the cooling water temperature is 80 ° C or higher, the fuel burner 4 is stopped and the fuel valve A81 and the fuel valve are stopped. Close B81 'together or close the open fuel valve. At this time, as described above, the piston portion 83 or 83 '
Controls the unburned fuel in the vaporizer 7 to the control chamber 84 or 8
Since it is sucked into 4'and further air is sucked into the vaporizing device 7 through the ejection holes 72, the residual fuel inside the vaporizing device 7 is ignited by the high temperature vaporizing glow plug 71 which is still energized and burned. Simultaneously with the operation of such a combustion valve, the bypass valve 10 is fully opened to stop the inflow of air, the ignition glow plug 6 is de-energized, and when the cooling water temperature is 80 ° C or higher, the blower 16 for the conventional heating device is used. Is turned on and heating by the cooling water heater is started.

Next, the switch 194 is disconnected after a lapse of a predetermined time, and the power supply to the vaporization glow plug 71 is cut off.

Also, after the heating of the warm air from the heat exchanger 5 is started in step g, the heating signal WP from the heating position switch 25
In the case of the 2nd position (step h), in order to increase the combustion amount of fuel, the fuel valve A81 is closed and the fuel valve B81 ′ having a large flow rate is opened, the bypass valve 7 is set to the opening 2, and the combustion air is also increased to perform combustion. Increase the amount. The heating signal WP is 3r
In the d position, in order to further increase the combustion amount, both the fuel valve A81 and the fuel valve B81 'are opened, the bypass valve 10 is opened to maximize the combustion of the fuel, and a large amount of heat is obtained. .

Next, the warm air temperature signal WA from the warm air temperature sensor 15 that detects the temperature of the warm air at the outlet 12 obtained in the above flow is
If the temperature is over 60 ° C (step i or j), the operation of the heating burner 4 is stopped, so the fuel valve A81 and the fuel valve B81 'are closed, the bypass valve 10 is fully opened, and the vaporization glow plug 71 and ignition are performed. The glow plug 6 is turned off. Then, after a lapse of a predetermined time, the process proceeds to point D where the heating signal WP is detected. Further, in step i or j, if the warm air temperature signal WA is 60 ° C. or less, the combustion is continued, and after a predetermined time elapses, the temperature of the ignition glow plug 7 is checked again and the combustion in the heating burner is resumed. The state is checked and each flow proceeds.

When the water temperature signal WS is 10 ° C. or higher in step a, the heating signal WP is checked, and when the heating signal WP is in the heating position (step k), the water temperature signal WS is checked (step k). l) If the cooling water temperature is 80 ° C or higher, follow the same flow as YES in step a)
Enter the process of operating.

Further, if the heating signal WP is not in the heating position in step k, and if the water temperature signal WS is judged to be 80 ° C. or more in the cooling water temperature in step l, the operation of the heating burner 4 is not necessary, so that FIG. The flow proceeds from the lowest stage of 2) to the second stage, and enters the flow for stopping the combustion of the heating burner.

That is, as described above, the combustion valve A81 and the combustion valve B81 'are closed to stop the fuel supply, the unfueled fuel in the vaporizer is sucked by the piston portion, and air is further introduced into the vaporizer 7. The residual fuel is burned, the bypass valve 10 is fully opened at the same time to stop the inflow of air, and the energization of the ignition glow plug 6 is stopped. Then, after the elapse of a predetermined time, the energization of the vaporization glow plug 71 is stopped, and the operation of the heating burner 4 is stopped.

Incidentally, in FIG.
Only one system is shown for the command to the drive source 88 in the same figure as the command to the drive source 88 from the main control unit 191 at the same time.

Although the present invention has been described above with reference to one embodiment, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

(Effects of the Invention) The present invention, when burning the heating burner of the vehicle rapid heating system,
The fuel valve has a piston valve that sucks fuel from the vaporizer of the heating burner, shuts off the fuel, recovers unfuel, introduces air into the vaporizer, and energizes the vaporization glow plug for a predetermined time. After shutting off the fuel passage with the valve, there is no fuel in the heating burner and combustion does not continue, therefore fresh air is sent to the engine,
It does not affect the engine output or engine exhaust.

Further, according to the present invention, when the combustion of the heating burner is stopped, even a slight amount of fuel remaining in the vaporizer is introduced into the vaporizer and burned, so that the residual fuel is not carbonized, and therefore pipe clogging can be prevented. .

Further, according to the present invention, the combustion state of the heating burner can be checked even when the engine is started, and good combustion can be obtained.Therefore, even in cold weather, it is possible to heat the interior of the vehicle from an early stage, and it is possible to use the defroster. is there. Further, since warm air can be sent to the engine even while the vehicle is running, incomplete combustion of the engine can be prevented and combustion efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing the construction of an embodiment of a heating burner device according to the present invention, FIGS. 2 and 3 are explanatory diagrams of its operation, and FIG. 4 is a block diagram of an automobile heating system using this embodiment, FIG. 5 is a flow chart showing an example of the processing. 1 ... Engine, 4 ... Heating burner, 7 ... Vaporizer 8 ... Fuel supply device, 71 ... Vaporizing glow plug, 81 ... Fuel valve A, 83 ... Piston part.

Claims (1)

[Claims] 1. A heating burner equipped with a fuel vaporizer for ejecting vaporized fuel into a combustion chamber, a suction means for sucking fuel in the fuel vaporizer, and a suction means for operating when the combustion of the heating burner is stopped. A heating burner device having a fuel vaporizer vaporization glow plug and a control device for controlling energization.