JPS63263321A - Combustion type room heater - Google Patents

Abstract

PURPOSE:To permit the sure detection of the abnormality of a fan for combustion regardless of the using condition of a combustion type room heater, by a method wherein a resistor is provided in a wiring for supplying current to the motor of the fan for combustion to control the operation of a combustion unit in accordance with the voltage of both terminals of the resistor. CONSTITUTION:A heater control circuit is a control circuit employing a micro- computer equipped with a central operation processor, not shown in a diagram, a read-only memory and the like. The conduction of the title heater is controlled by controlling the conduction of relay coils 591-594 by switch relay contacts 591a-594a ON-OFF in accordance with a voltage in both terminals of a resistor 580 for voltage detection, which is a resistor interposed in series in a wiring for supplying current to a both-shaft motor 110. When the voltage in both terminals of the resistor is higher than a normal voltage, an excessive load applied on the motor, which is caused by the clogging of the flow passage of combustion air by dust or the like, stopping of a fan for combustion due to the clogging by fibers or dust, or an external pressure, for example, may be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heating device that heats air within a single room by burning fuel, and is particularly suitable for use in a combustion type heating device for a vehicle.

[Prior Art] Combustion-type heating devices are used that use oil, gas, or the like as a fuel and are equipped with a combustion blower that supplies combustion air to a combustion chamber.

This type of device forcibly supplies combustion air to the combustion chamber, so if an abnormality occurs in the air blowing condition of the combustion blower, it may cause the generation of toxic gas due to abnormal combustion or unburned fuel. The outflow is carried out.

Therefore, in the past, the combustion air passage Ju1 was installed in the combustion air passage.
A pressure switch was installed to detect the blower pressure of the blower, and the operation of the pressure switch detected abnormalities in the combustion blower and controlled combustion in the combustion section.

[Problems to be Solved by the Invention] However, the method that uses a pressure switch to detect the air blowing state of a combustion blower is There is a difference between the outside temperature and the inside temperature of the pressure switch, which can cause water droplets to form in the air passage where the pressure switch is located. For this reason, in the above-mentioned conventional combustion type wafer display device, there is a possibility that water droplets may flow into the pressure switch, causing the pressure switch to malfunction.

The present invention has been made in view of the above circumstances, and its purpose is to provide a combustion type heating device that can reliably detect abnormalities in a combustion blower regardless of the usage conditions of the device. be.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a combustion air supply 7 for forcibly supplying combustion air to a combustion chamber in which fuel is combusted.
A combustion section equipped with one engine and a control l for controlling the combustion section.
In the combustion type heating apparatus having a four-way heating system, a resistor is provided in the wiring for supplying the morph hemiflow of the combustion blower, and the control S4i controls the operation of the combustion section according to the voltage across the resistor. Control is a technical means.

[Function] In the present invention having the above configuration, a resistor is provided in the wiring for supplying current to the insulator of the combustion blower, and the voltage across the resistor is detected. For example, if the voltage across the resistor is lower than the normal voltage, it is possible to detect a break in the wiring that supplies current to the motor. Also, for example, if the voltage across the resistor is higher than the normal voltage, the combustion air flow path may become clogged with dust, etc.
Alternatively, it is possible to detect that the motor is overloaded, such as when the combustion air blower n stops due to fibers, dust, external pressure, or the like.

[Effects of the Invention] According to the present invention, a resistor is provided in the wiring that supplies current to the motor of the combustion blower, and by detecting the voltage across the resistor, the blowing state of the combustion blower can be determined. Therefore, even if water droplets are generated in the combustion air passage, abnormal rotation of the combustion blower can be stably detected.

Therefore, when an abnormality occurs in the air blowing state of the combustion blower, generation of toxic gas due to abnormal combustion and leakage of unburned gas can be reliably prevented. □ [Example] Next, the combustion type heating device of the present invention will be described based on an example, not shown in the drawings.

FIG. 2 shows a sectional view of a combustion type heating i-neck 100 for a vehicle. This combustion type heating device 100 is installed under the seat, and is attached to the floor 200 of the vehicle by fastening bolts and nuts. The combustion type heating device a10G also includes a combustion section 300 that heats the air inside the vehicle by burning fuel, and a cover 3 that houses the combustion section 300.
10.

The combustion section 300 includes a combustion air passage 3 that burns air sucked in from outside the vehicle interior and avoids releasing combustion gas to the outside of the vehicle interior again.
20, and an indoor air passage 330 that exchanges heat with the combustion gas in the combustion air passage 320 and discharges the air inside the vehicle interior into the vehicle interior again as warm air.

The combustion air passage 320 includes an outside air introduction passage 321 that introduces air from outside the vehicle compartment through the floor 200. This outside air introduction passage 321 is provided upstream of a combustion air drive chamber 322 in which a centrifugal combustion fan 411 mounted on one shaft of the double-shaft motor 410 is disposed, and
10 is energized, the air in the combustion air passage 32G is caused to flow.

In this embodiment, the combustion blower 400 of the present invention is configured by the double-shaft motor 410 and the combustion fan 411.

A combustion chamber 323 is provided downstream of the combustion air drive chamber 322 and is equipped with a combustion injection nozzle and a glow plug 420 (see FIG. 1), which receives fuel from a fuel pump 430 (see FIG. 1). The fuel is combusted. Combustion gas generated in the combustion chamber 323 is supplied into a heat exchanger 325 through a duct 324, and in this heat exchanger 325, heat is exchanged between the combustion gas and the air inside the vehicle passing through the indoor air passage 330. It will be done. Heat exchange S! 5325 is connected to a combustion gas discharge path 326 that penetrates the floor 200 and discharges combustion gas downstream of the heat exchanger 325 to the outside of the passenger compartment.

The indoor air passage 330 is formed between a cylindrical case 331 containing the heat exchanger 'a 325, the double-shaft motor 410, etc., and the outer periphery of the heat exchanger 325, the double-shaft motor 410, etc. A suction port 332 is opened at the end of the case 331 on the side where the double-shaft motor 410 is arranged, and a discharge port 333 is opened at the end on the heat exchanger 325 side.

Furthermore, a centrifugal convection fan 412 is installed on one shaft of the double-shaft motor 410. This results in
When the double-shaft motor 410 is energized, the air inside the vehicle is passed through the inlet 311 provided in the cover 310 to the inlet 33.
2, the air in the indoor air passage 330 is sucked in, and the air that has been heat exchanged in the heat exchanger 325 is sent to the discharge port 33.
3, and is discharged into the vehicle interior again from an outlet 312 provided in the cover 310.

FIG. 1 shows a combustion control device f that controls the combustion section 300.
U 500 not shown.

The combustion control equipment 500 controls the double-shaft motor 410, glow plug 420, and fuel pump 430 with a heater control circuit 520 and a pump combustion control circuit 530 when a main switch 510 is turned on.

The heater control circuit 520 includes a control circuit C using a microcomputer equipped with central processing, read-only memory, etc. (not shown), a main switch 510, and a combustion fan 411 and a convection fan 412. -Jfiff for low switching
i selector switch 540, for example ONL at 70℃, 60
A burner switch 550 that turns off at ℃, e.g. 220
An overheat prevention switch 560 that turns off at 150°C and turns on at 150°C, and a temperature fuse 5 that turns off at about 75°C, for example.
70 and the voltage at both ends of the voltage detection resistor 58G, which is the resistor C of the present invention interposed in series with the wiring that supplies current to the dual-axis motor 410, the relay coil 5
91 to 594 are energized and relay contacts 591a to 59
4a is turned OFF to perform the above-mentioned energization control, the fuel valve 6001, which is the main valve of the fuel pump 430, the operation lamp 610, and the abnormality check lamp 6.
20 is energized and controlled.

In addition, the burner switch 550 and the overheat prevention switch 56
0 is attached to the indoor air passage 330 side of the heat exchanger 325 as shown in FIG. 2, and the temperature fuse 570 is attached downstream of the case 331 from the indoor air passage 330 side.

Further, 630 shown in the figure is a batch 1 power supply for the vehicle, 640 is a key switch, 650 is a voltage drop resistor that lowers the voltage supplied to the double-shaft motor 410, and 661
~664 indicates a fuse.

Next, the above control by the heater control circuit 520 will be explained based on the flowcharts shown in FIGS. 3 to 8.

First, in step S1, it is determined whether the key switch 640 is turned on. If the judgment result is No (OFF), the process returns; if YES (ON), the main switch 510 is turned off in step S2.
It is determined whether or not the switch is turned on. If the judgment result is No (OFF), repeat step S2 and
If ES (ON), the operation lamp 610 is energized in step S3. Next, in step S4, it is determined whether the burner switch 550 is on. The judgment result is YES (OFF >
In this case, in step S5, the overheat prevention switch 5
It is determined whether 60 is ONL or not. If the determination result is YES (ON), in step S6, the relay coil 591 is energized to connect the relay contact 591.
a to ONL, energize the globe lab 420. Next, in step S7, the main switch 510 is turned on.
Then, if the result of the determination is NO, repeat step S7. If YES, in step S8 the relay coil 592 is energized to turn the relay contact 592a ON, and in step S9 the relay coil 593 is turned ON.
Turn on the relay contact 593a by energizing it, step S1
0, the relay coil 594 is energized to turn on the relay contact 594a, and in step S11, the fuel valve 600 is energized. As a result, the double shaft motor 41
0 is energized bypassing the voltage drop resistor 650, and the fuel pump is energized to supply fuel to the fuel injection nozzle.

Next, in step 812, after the first set time 1 has elapsed, it is determined whether a fourth set time 14 (for example, 2 seconds) has elapsed. If the determination result is NO, step 812 is repeated, and if Y[S, in step S13, after the first set time ■1 has elapsed, the second set time 12 (for example, 3 minutes) has elapsed. Make a judgment as to whether or not.

If the determination result is NO, it is determined in step S14 whether the voltage V across the voltage detection resistor 580 is higher than the first predetermined voltage v1. The first predetermined voltage v1 is set to, for example, half or less of the voltage detected across the voltage detection resistor 580 when power is normally supplied to the double-axis motor 410.
If the voltage ■ across 0 is lower than the first predetermined voltage v1,
It is determined that there is a break in the wiring that supplies power to the double-axis motor 410.

If the determination result in step 814 is Y[S, it is determined in step S15 whether or not the voltage ■ across the voltage detection resistor 580 is lower than the second predetermined voltage v2. This second predetermined voltage v2 is applied to the voltage detection resistor 580 when power is normally supplied to the double-axis motor 410.
and the voltage detected across the combustion feed 11111140
When an excessive load is applied to both #ATl--ta 410, such as when the rotation of the #ATl-0 is locked or the combustion air passage 320 is clogged with dust, the voltage detected at both ends of the voltage detection resistor 580. -pressure detection resistor 580
If the voltage V across both ends is higher than the second predetermined voltage v2, it is determined that the combustion feeder 1111400 is overloaded (locked).

If the determination result in step S15 is Y[S, it is determined in step 316 whether or not temperature fuse 570 is ON. If the judgment result is YES (ON), in step 317, the burner switch 5
50 is ONL, 1. If the result of the determination is No (OFF), the process returns to step S13; if YES (ON), the relay coil 591 is de-energized in step 818. Relay contact 591
Turn OFF L to stop the power supply to the globe lab 420.

Next, in step 819, the air volume changeover switch 54
It is determined whether or not 0 is turned on. If the determination result is YES (ON), in step 820, the relay coil 593 is energized and the relay contact 593 is turned on.
a is ONL, double-axis motor 410 is voltage drop resistor 6
50 is bypassed and energized. Also, step 819
If the judgment result is NO (OFF), step S2
1, the relay coil 593 is de-energized to turn off the relay contact 593a, and the double-shaft motor 410 is energized via the voltage drop resistor 650.

Next, in step S22, it is determined whether the key switch 640 is turned on. If the determination result is YES (ON), in step 823, it is determined whether the main switch 510 is turned on. If the determination result is YIES (ON), it is determined in step 824 whether the overheat prevention switch 560 is in the OWL state. If the determination result is YES (ON), it is determined in step 825 whether the temperature fuse 570 is ON.

That judgment! If J Song is YES (ON),
In step 826, burner switch 550 is turned off.
NL/ is determined. The judgment result is Y
If ES (ON), the voltage V across the voltage detection resistor 580 is set to the first predetermined voltage v in step 827.
It is determined whether the value is higher than 1 or not. The judgment result is Y[
In the case of S, it is determined in step 328 whether the voltage V across the voltage detection resistor 580 is lower than the second predetermined voltage v2. If the determination result is YES, the process returns to step S19.

If the determination result in step S4 is No (ON) or if the determination result in step S5 is NO (OFF), as shown in FIG. 4, the abnormality check lamp 620 is energized in step 29, and I was in J3,
It is determined whether the key switch 640 is turned on. If the determination result is YrS (ON>), it is determined in step 331 whether or not the main switch 510 is turned on.The determination result is YES.
(ON), the process returns to step 829.

Further, if the judgment result in step S30 is NO (OFF), and if the judgment result in step 831 is NO (Kano[), the abnormality inspection lamp 620 is de-energized in step 832, and the operation lamp 610 is turned off in step 833.
is de-energized, and then the process returns to step S1.

If the determination result in step 813 is YES, step S
If the judgment result in step 14 is NO (wire breakage detected), proceed to step 3.
If the determination result in Step 815 is No ((1 check detected), or if the determination result in Step 816 is No (OFF), as shown in FIG. 5, in Step S34,
The abnormality check lamp 620 is energized, and in step S35, the relay coil 591 is de-energized to close the relay contact 591.
OFF L, G0-Plug 420 is de-energized,
In step 836, the relay coil 592 is de-energized and the relay contact 592a is turned off. In step S37, the relay coil 593 is de-energized and the relay contact 5 is turned off.
93a is OFF L/, and in step 838, the relay coil 594 is de-energized and the relay contact 594af O
F[shi, in step 839)1-■le valve 6
00 is de-energized. As a result, when the double-shaft motor 410 is energized via the voltage drop resistor 650, the fuel pump 430 and the fuel valve 600 are de-energized and the supply of fuel to the fuel injection nozzle is stopped.

Next, in step 84G, it is determined whether the key switch 640 is turned on. If the determination result is YES (ON>), it is determined in step 341 whether or not the main switch 510 is turned on. If the determination result is YES (ON), the process returns to step 840. If the judgment result in S40 is No (OFF), and if the judgment result in Step S41 is No (OFF), the process goes to Step S42, and the abnormality check lamp 620 is de-energized, and in Step 843, the operation lamp 610 is turned off. After de-energizing, the process returns to step S1.

If the judgment result in step 822 is No (OFF'), and if the judgment result in step 823 is NO (OFF'),
), as shown in FIG. 6, the operation lamp 610 is turned on in step 344. Next, in step 845, the relay coil 594 is de-energized to turn off the relay contact 594a, and in step 846, the fuel valve 600 is de-energized. As a result, the fuel pump 430 and the fuel valve 600 are de-energized and the supply of fuel to the fuel injection nozzle is stopped.

Next, in step S47, it is determined whether a third set time T3 (for example, 7 minutes) has elapsed since combustion in the combustion section 300 stopped (for example, after the fuel pump 430 and the fuel valve 600 were de-energized). make a judgment. If the result of the determination is NO, it is determined in step 348 whether or not the burner switch 550 is ON/OFF. If the judgment result is YES (ON), in step 849, the wind ω changeover switch 54
It is determined whether or not 0 is turned on. If the determination result is YES (ON), in step 850, the relay coil 593 is energized and the relay contact 593 is turned on.
a is OWL, double-axis motor 410 is voltage drop resistor 6
50 is energized, and then step S47
Return to Also, if the determination result in step S49 is No (OF
F>, in step 851, the relay coil 593 is de-energized, the relay contact 593a is turned off, and the double-shaft motor 410 is energized via the voltage drop resistor 650, and then the process returns to step 847.

If the judgment result in step 847 is YES, and if the judgment result in step 348 is No (OFF), in step 852, the relay coil 592 is de-energized and the relay contact 592a is turned OFF. Coil 593 is de-energized and relay contact 5
Turn off 93a. As a result, the double-shaft motor 410 is de-energized, and then the process returns to step S1.

If the determination result in step 824 is No (OFF), as shown in FIG. 7, in step 354, the abnormality check lamp 620 is energized. Next, step S55
In step 35B, the relay coil 594 is de-energized and the relay contact 594a is set to 0. In step 35B, the fuel valve 600 is de-energized.As a result, the fuel pump 430 and the fuel valve 600 are de-energized and the fuel injection nozzle Fuel supply to the vehicle will be cut off.

Next, in step S57, it is determined whether or not a third set time (3) has elapsed since combustion in the combustion section 300 stopped. If the judgment result is NO, step 8
At 58, it is determined whether the burner switch 55G is ONL. The judgment result is YES (
ON), in step S59, it is determined whether or not the wind m changeover switch 540 is turned on. If the judgment result is Y[S (ON), step S
In GG, the relay coil 593 is energized, the relay contact 593a is ONL, and the double-shaft motor 410 is connected to the resistor 65.
0 is bypassed and energized, and then the process returns to step 857. Also, the determination result in step 859 is No (01'
In the case of F), in step 361, the relay coil 593 is de-energized and the relay contact 593a is turned off.
The double-axis motor 410 is energized via the voltage drop resistor 65G, and then the process returns to step 857.

If the judgment result in step 857 is YES, and if the judgment result in step 858 is No (OFF), in step 862, the relay coil 592 is de-energized and the relay contact 592a is turned OFF L, and in step 863, the relay coil 592 is turned off. 593 is de-energized and relay contact 59
Turn 3a off. As a result, the double-shaft motor 410 is de-energized.

Next, in step 364, it is determined whether the key switch 640 is turned on. If the determination result is YES (ON), it is determined in step S65 whether the main switch 510 is turned on. If the determination result is YES (ON), the process returns to step 864. Further, if the determination result in step 5f34 is No (OFF), and if the determination result in step S65 is NO (OFF), the abnormality inspection lamp 620 is de-energized in step 866, and in step 867
In this step, the operation lamp 610 is de-energized, and then the process returns to step S1.

If the judgment result of step S25 is No (0 [F), if the judgment result of Stella 7826 is No (OFF), if the judgment result of Stain 7S27 is NO (wire breakage detection), or if the judgment result of Step 828 is NO. (Lock detection), as shown in FIG.
a is turned off L/, 1 in step 870, the relay coil 593 is de-energized and the relay contact 593a is turned off.
In step 871, the relay coil 594 is de-energized and the relay contact 594a is turned off. In step 372, the fuel valve 600 is de-energized. As a result, the voltage drop resistor 65 of the double-shaft motor 410
0 and the fuel pump 43
0 and the fuel valve 600 are de-energized and the supply of fuel to the fuel injection nozzle is stopped.

Next, in step 873, it is determined whether the key switch 640 is turned on. If the determination result is YES (ON), it is determined in step 874 whether or not the main switch 51G is turned on. If the determination result is YES (ON), the process returns to step 873. Further, if the judgment result in step Sγ3 is NO (OFF), and if the judgment result in step S74 is No (OFF), the abnormality inspection lamp 620 is de-energized in step 875, and the operation lamp 61G is turned on in step 876. After de-energizing, the process returns to step S1.

Next, an example of the operation of the above embodiment will be explained using a time diagram.

b) Figure 9 does not show an example of normal operation, but shows a time chart.

Is the main switch 510 ON at time a1 when the key switch 640 is ON? When the heater control circuit 520 is activated, the operation lamp 61G lights up, the glow plug 42G is energized, and the glow plug 420 becomes red hot.

First set time from the start of energization of glow plug 42G■1
At time a2, when the time has elapsed, both wheels 410 are energized bypassing the voltage drop resistor 650, and the fuel pump 430 and fuel valve 600 are turned ON.
/, the air pressure of the combustion air passage 320 and the indoor air passage 330 is set to lli. As a result, combustion air is supplied to the combustion chamber 323 via the outside air introduction/path 321 and the combustion air drive chamber 322, and fuel is supplied from the fuel injection nozzle to the glow plug 420, and the combustion section 30 is supplied with fuel.
At 0, fuel combustion starts.

When the burner switch 550 is turned on at time a3, which is within the second set time ■2 after the first set time ■1 has elapsed,
The power supply to the glow plug 420 is stopped, and the combustion air passage 320 and the indoor air passage 330 (7) are set to the air condition according to the setting state of the air condition changeover switch 540. As a result, the combustion gas generated by combustion of the fuel in the combustion chamber 323 is sent to the heat exchanger 325 via the duct 324 by the rotation of the combustion fan 411, and is sent to the indoor air passage 330 via the heat exchanger 325. The combustion gas exchanges heat with the passing air, and the combustion gas after heat exchange is discharged from the combustion gas discharge path 326 to the outside of the vehicle interior. In addition, convection fan 4
12, the air inside the vehicle compartment sucked into the case 331 from the inlet 311 of the cover 310 is transferred to the heat exchanger 3.
The cover 3 is heated by exchanging heat with the combustion gas through the cover 3.
The air is blown into the vehicle interior through the outlet 312 of No. 10 to heat the interior of the vehicle. In addition, in this embodiment, since the air volume selector switch 540 is set to 1-OW at this time, the double-shaft motor 410 is energized via the voltage drop resistor 650, and the combustion air passage 320 and indoor air are energized. aisle 330
The air volume becomes Low.

When the air outlet changeover switch 540 is set to 111 at time a4, the double-shaft motor 410 is energized bypassing the voltage drop resistor 650, and the air flow of the combustion air passage 320 and the indoor air passage 330 becomes lli. Also, at time a5, the fiffl changeover switch 540 is set to Low! When P-Sa is determined, the double-shaft motor 410 is energized via the voltage drop resistor 650, and the air pressure in the combustion air passage 320 and the indoor air passage 330 becomes Low.

Furthermore, at time a6, the 81 tone switching switch 540 is turned on.
When set to
20 and the indoor air passage 330 are outdated. Also, at 121a7, the wind jl and TI switch 540 were set to Lo.
When set to w, the double-shaft motor 410 is energized via the voltage drop resistor 650, and the combustion air passage 320JJ
and ff1ffi of the indoor air passage 330 becomes 1.0W.

When the key switch 640 or the main switch 510 is turned off at time a8, the operation lamp 610 is turned off, the fuel pump 430 and the fuel valve 600 are turned off, and combustion in the combustion section 300 is stopped. After the combustion of this combustion section 300 stops, the third
Until the Q fixed time ■3 has elapsed, and the burner switch 5
Until 50 is turned off, exhaust operation is performed according to the setting state of air volume changeover switch 540.

Therefore, at time a9, the hearsay changeover switch 540 is
When switched to , the double-shaft motor 410
50 is energized, and an lli exhaust operation is performed. In this embodiment, at time alo, the burner switch 55
When 0 becomes 0 [F], the power supply to the double-shaft motor 410 is stopped, and the operation of the combustion heating device 100 is stopped.

O) FIG. 10 shows a time chart in the case where the combustion blower 400 is disconnected from the start of operation or a disconnection occurs.

When the main switch 510 is turned on at time b1 while the key switch 640 is turned on, the operation lamp 610 is first turned on by the operation of the heater control circuit 520, and the glow plug 420 is energized. 420 becomes red hot. glow plug 4
At time b2, when the first set time 11 has elapsed since the start of 1Ffi of 20, the double-shaft motor 410
At the same time, the fuel pump 4301 and the fuel valve 600 are turned on, and the air flow in the combustion air passage 320 and the indoor air passage 330 is turned on.
is set to i. As a result, fuel is supplied from the fuel injection nozzle to the glow plug 420, and combustion of the fuel is started in the combustion section 300.

At time b3 when the fourth setting interval ■4 counted after the first setting time ■1 has elapsed, the combustion air blast 940
If 0 is the lli line or locked, the abnormality inspection lamp 620 lights up, the power supply to the double-shaft motor 410 is stopped, and the fuel pump 430 and fuel valve 600 are turned off. will be stopped.

Even if the combustion blower 400 is disconnected or unlocked at time b4, the combustion section 300 does not perform combustion, and at time b5 when the key switch 640 or main switch 510 is turned off to 0 [F], the operating lamp 610 and the abnormality check lamp 62
0 goes out.

c) FIG. 11 shows a time chart in the case where the combustion blower 400 is disconnected or [1] occurs during operation.

At time C1 during the combustion of fuel by the combustion section 300,
When the combustion feed [140G] is disconnected or locked, the heater control circuit 520 is activated, the abnormality check lamp 620 lights up, the power supply to the double-shaft motor 410 is stopped, and the fuel pump 430, )1-
L-pulp 600 is turned off and combustion in combustion section 300 is stopped.

If the combustion blower f14@400 is disconnected or locked during combustion, the combustion section 300 will not perform combustion even if the combustion blower 400 is disconnected or the vine is released at time C2, for example. Then, at time C3, key switch 6
40 or the main switch 510 is turned off, the operation lamp 610 and the abnormality inspection lamp 620 are turned off.

As shown above, according to the present invention, the combustion blower 40
A voltage detection resistor 580 is provided in the wiring that supplies current to the double-shaft motor 410 (A), and by detecting the voltage across the voltage detection resistor 580 (A), air blowing conditions such as disconnection of the combustion blower can be detected. Because it is possible to detect
Even if water droplets occur in the combustion air passage 320, abnormal combustion can be detected stably and reliably in the rotation of the combustion air blower i 400. It is possible to reliably prevent the generation of unburned gas and the outflow of unburned gas.

In addition, in this embodiment, the double-shaft motor 410 is for convection)? The indoor air passage 330 also serves as a drive motor for the air passage 412.
Even if the inside is clogged with dust etc., the combustion part 30
It is possible to stop the combustion of 0.

In this embodiment, an example in which the present invention is applied to a combustion type heating device for a vehicle is shown, but it may be applied to other combustion type heating devices for home use, industrial use, ship use, etc.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of the combustion control device, Fig. 2 is a side sectional view of the combustion type heating device for a vehicle, Figs. 3 to 8 are flow charts showing the operation of the heater control circuit, and Figs. 9 to 11 The figure is a time chart for explaining the operation of this embodiment. In the diagram 100... Heavy duty combustion type heating system v130G...
・Combustion part 40G... Combustion feed mtR410... Double shaft motor 411... Combustion fan 500... Combustion control device 580... Voltage detection resistor

Claims (1)

[Scope of Claims] 1) A combustion unit that includes a combustion section that is equipped with a combustion blower that forcibly supplies combustion air to a combustion chamber that burns fuel, and a control device that controls the combustion section. type heating device, wherein a resistor is provided in the wiring for supplying current to the motor of the combustion blower, and the control device controls the operation of the combustion section according to the voltage across the resistor. Combustion type heating device. 2) The control device controls, from the voltage across the resistor,
The combustion type heating device according to claim 1, wherein a disconnection with the motor is detected. 3) The control device controls, from the voltage across the resistor,
The combustion type heating device according to claim 1, wherein an excessive load on the motor is detected. 4) The combustion type heating device according to any one of claims 1 to 3, wherein the control device controls the combustion section using a microcomputer.