JP2505723B2 - Vaporizer heating device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carburetor heating device mounted on an engine of an automobile, a motorcycle, a motorcycle, or the like.

[0002]

2. Description of the Related Art A carburetor installed in an engine of an automobile, a two-wheeled vehicle, a four-wheeled vehicle or the like, when used in a cold region, has a fuel outlet hole or a vicinity of a slow air intake port. In some cases, freezing of water in the air may change these opening areas, which may result in engine operation failure. Such a freezing phenomenon occurs not only when the environmental temperature is below the freezing point (for example, 0 ° C.) but also when the environmental temperature is slightly higher than the freezing point, due to the temperature decrease (dissipation of vaporization heat) accompanying the fuel vaporization after starting. There are cases. Also, compared to the main system that has moving parts such as jet needles and valves,
It is likely to occur in a slow system having a small hole diameter and no moving part, and moreover, it is likely to occur when the engine is not warmed immediately after starting.

In the prior art, as a method of preventing the above-mentioned icing phenomenon, a method of circulating a part of engine cooling water or engine oil warmed by engine rotation to a carburetor is adopted. Also, a method of attaching an electric heater to the carburetor body has been proposed. Documents disclosing such a conventional technique include, for example, Japanese Utility Model Publication 1-7.
No. 4346 (Practical application No. 62-169127), No. 1
-80652 (Jpn. Pat. Appln. No. 62-177026). When using the electric heater, for example,
An oil temperature switch for detecting the temperature of the engine oil is provided, and when the engine oil is in a cold state below a predetermined temperature (for example, about 50 ° C.), the oil temperature switch is turned on to heat the carburetor. ing.

[0004]

However, in the conventional vaporizer heating device using the electric heater,
Since the heater on / off is controlled based only on the engine temperature detected value by the oil temperature switch etc., the heater may be turned on even under weather conditions other than the condition in which the carburetor freezes. Power may be consumed unnecessarily.

Further, in the carburetor heating device using the electric heater, when the main switch is on, the oil temperature switch is on, the engine is not firing, that is, the main switch. The heater is still on when you forget to switch it off, or when the engine stalls when left idle. Therefore, even when the generator (generator) is in a zero output state, the heater power is consumed, and the battery is more likely to be over-discharged.

The present invention has been made in view of the above technical problems, and an object of the present invention is to minimize the energy for operating the heater by eliminating the energization of the heater when it is not necessary. It is an object of the present invention to provide a heating device for a vaporizer that can efficiently prevent the freezing phenomenon of the vaporizer in a limited manner. Another object of the present invention is to provide a heating device for a vaporizer capable of preventing the freezing phenomenon of the vaporizer more efficiently by surely cutting off the power supply to the heater even when the engine stalls. .

[0007]

The invention according to claim 1 relates to a vaporizer.
Smell in the heating device of a vaporizer equipped with an electric heater
Power supply → main switch → starter switch → mug
The series connected in the order of the excitation part of the net switch
1 circuit part and the power supply → the magnetic switch
Switch part of H → starter motor connected in series
Second circuit portion and a power supply for the first circuit portion
Of the normally open type relay, branched from between the main switches
The switch part and the electric heater are connected in series in this order.
A third circuit part and a main switch for the first circuit part.
Switch between the switch and starter switch
Relay switch → Excitation of the normally open type relay
Part → carburetor temperature switch for detecting carburetor temperature
A fourth circuit portion connected in series and the second circuit portion
Minute magnetic switch and starter
Branch from the motor and normally close the fourth circuit part.
A fifth circuit part connected to the excitation part of the type relay
The provided, and the temperature of the vaporizer is less than the set value, and the starter switch is in the off, by adopting a configuration for heating the vaporizer by supplying an electric current to the electric heater, the vaporizer of
Accurately control the heating operation according to the conditions that cause the freezing phenomenon
The power to the heater can be minimized when not needed.
Energy to operate the heater
To prevent the freezing phenomenon of the vaporizer efficiently.
And when driving the starter motor
Vaporizer that can eliminate the possibility of battery over-discharge
The heating device is provided .

According to the inventions of claims 2 and 3, in addition to the structure of claim 1, the fourth circuit portion is vaporized.
Outside air for detecting the outside air temperature in series with the unit temperature switch
It has a temperature switch, and when the outside air temperature is below the set value, the electric heater is energized to heat the vaporizer.
Configuration or main switch of the first circuit portion
And engine start by branching from between the starter switch and
A sixth circuit portion connected to the circuit, the fourth circuit
Exciting part of the normally open type relay and the carburetor in the road portion
The heater control unit is between the temperature switch
The heater control unit connected in series
Is the presence or absence of the ignition signal of the engine ignition circuit
When the signal is detected, the normally open type relay is detected.
-Exciting part and the carburetor temperature switch are electrically connected
However, it is configured to electrically shut off when there is no such signal.
The electric power when the engine is not firing.
With the structure that blocks the energization of the formula heater,
The above object is achieved more efficiently.

The invention of claim 4 is in the structure of claim 1.
The engine temperature switch that detects the engine temperature.
Is connected in place of the vaporizer temperature switch, not more than a temperature of the engine is a set value, and when the starter switch is turned off, by adopting a configuration in which warm the vaporizer by supplying an electric current to the electric heater, vaporizing Freezing the warming operation of the vessel
It can be precisely controlled according to the elephant generation condition and is unnecessary
At any time, by turning off the power to the heater as much as possible,
Energy to operate the motor is minimized
Can effectively prevent the freezing phenomenon of the vaporizer,
Even when the starter motor is driven
Providing a vaporizer heating device that can eliminate the possibility of electricity
It is intended to test.

[0010] The invention of claim 5, in addition to the first aspect, the main switch and the starter of the first circuit portion
It is branched from between the switch and connected to the engine ignition circuit.
The sixth circuit portion, which detects the temperature of the engine
The engine temperature switch replaces the carburetor temperature switch
Connected by means of the normally open type reconnection of the fourth circuit portion.
Between the exciter of the Ray and the engine temperature switch.
Control units are connected in series,
The control unit of the engine ignition circuit
When there is an ignition signal and it is detected
Is the normally-open relay exciting part and the engine temperature.
Switch is electrically connected to the
The above object is achieved more efficiently by adopting a structure in which the electric heater is electrically disconnected so that the electric power to the electric heater is interrupted when the engine is not firing.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of a vaporizer provided with a heating device to which the present invention is applied. In FIG. 1, an intake passage 11 that penetrates a main body (a carburetor main body) 10 of a carburetor 40 is formed, and air flowing in a direction indicated by an arrow A from an air cleaner (not shown) passes through the intake passage 11 on the left side of FIG. It is introduced to an engine (not shown). On the other hand, below the intake passage 11, a float chamber 12 for storing liquid fuel such as gasoline is formed.
The oil level of the fuel in the float chamber 12 is constantly maintained by a float 14 that can be vertically swung around a fulcrum 13 and a fuel supply needle valve 15 that is controlled to open and close by the vertical movement of the float 14. It is maintained within the proper range.

Therefore, the intake passage 11 is provided with a butterfly type throttle valve 16 for controlling the amount of intake air (the amount of intake air). On the other hand, the float chamber 12
Between the intake air passage 11 and the intake passage 11, a main system 17 mainly for controlling the fuel supply amount (air-fuel ratio) during output operation.
And a slow system 18 for controlling the fuel supply amount (air-fuel ratio) during low speed operation including idling.

The fuel passage of the main system 17 includes a main nozzle 19 opening to the intake passage 11 and the main nozzle 19.
And a main jet 20 mounted at a lower portion (a position opening below the fuel oil level). A slide piston 21 slidable across the intake passage 11 is provided at a position corresponding to the main nozzle 19, and a jet needle 22 fitted into the main nozzle 19 is attached to the slide piston 21. ing. The jet needle 22 has a tapered shape, and is configured to adjust the fuel outlet area of the main nozzle 19 by changing the fitting depth of the jet needle 22 according to the movement of the slide piston 21. .
Further, the air for atomizing the fuel in the main nozzle 19 is
Air is introduced into the main nozzle 19 from an air intake 28 through a main air jet 29 for measurement.

The upper end of the slide piston 21 is connected to a diaphragm 23 which is displaced according to the negative pressure of intake air. The slide piston 21 is provided with a return spring 27.
Is always biased downward. A negative pressure chamber 24 is formed on the upper side of the diaphragm 23 through a hole 44 that communicates with the intake negative pressure, and an atmospheric pressure chamber 25 that communicates with the atmosphere is formed on the lower side of the diaphragm 23. Therefore, as the intake negative pressure becomes stronger due to an increase in the air flow velocity (flow rate) in the intake passage 11, the slide piston 21 overcomes the spring 27 and moves upward, whereby the fuel outlet 26 of the main nozzle 19 is discharged. The area is increased, and more fuel can be supplied. The throttle valve 16 is arranged downstream of the slide piston 21 in the intake flow as shown in the drawing.

The fuel passage of the slow system 18 includes a slow jet 30 for measuring fuel, which opens below the fuel oil level in the float chamber 14, a slow nozzle 31 for atomizing the fuel,
It is composed of a fuel passage 32 for atomized fuel and a plurality of small fuel outlet holes 33 opening to the intake passage 11. The fuel outlet hole 33 is formed in the vicinity of the intake upstream side from immediately below the throttle valve 16. The slow nozzle 3
The air for fuel atomization in 1 is introduced into the slow nozzle 31 from a slow air inlet 43 through a slow air jet 42 for measurement. In this embodiment, the fuel outlet hole 33 of the slow system 18 is connected to the intake passage 1.
1, the entire length of the slow system including the fuel passage 32 can be shortened, so that a slow system excellent in responsiveness to engine operation can be configured.

Therefore, the fuel outlet hole 33 of the carburetor body 10
Is formed in the vicinity of the lower side (downward) concave hole 34, and in the concave hole 34, a gap is filled with a heat conductive viscous substance such as heat conductive grease, so that an electric type for heating a vaporizer is formed. The heater 35 is inserted. The heater 35 is for preventing the freezing phenomenon of the vaporizer in cold weather. As the heater 35, a nichrome wire type, a ceramic type, a heating element type, or a conductive plastic is used. Various types and structures can be used as long as they can convert electric energy into heat energy. A stopper member 36 for holding the heater 35 in the recessed hole 34 is fixed to the carburetor body 10. The stopper member 36 is composed of, for example, a plate-shaped member and is detachably fixed by screwing or the like.

FIG. 2 is an exploded perspective view showing the heater 35 and the stopper member 36. 1 and 2
In the above, the heater 35 is provided with a lead wire 37 for supplying electricity, and the stopper member 36 is formed with a hole (opening) 38 for inserting the lead wire 37. A seat surface (not shown) is formed in the vicinity of the recessed hole 34 of the carburetor body 10, and a plate is formed by a screw hole (not shown) formed in the seat surface and a screw (or bolt) 39 as shown in FIG. The stopper member 36 having a plate shape is fixed.

Although only one carburetor is usually used when the engine has a single cylinder, a plurality of carburetors may be used depending on the number of cylinders when the engine has a plurality of cylinders. Figure 2 above
The configuration is one stopper member 3 for one carburetor.
6 shows a case where the heater 35 is prevented from coming off. On the other hand, in an engine in which a plurality of carburetors are installed in parallel, it is preferable to regulate the mutual positions of the carburetors and to suppress the movement thereof. Therefore, in the case of having a plurality of vaporizers, the heater 35 attached to each vaporizer is configured to be held by one long stopper member, and the stopper member regulates the mutual position of each vaporizer and Can also serve as a connecting member for suppressing the movement of the. The same can be applied to a V-type engine or the like.

FIG. 3 is a schematic perspective view showing a configuration in which a plurality of (two) carburetors such as a parallel two-cylinder engine are arranged in parallel, and which also serves as the stopper member and the connecting member. In FIG. 3, the stopper member 36 is formed by a single member having a length that straddles a plurality (two) of carburetors 40.
0 is arranged so as to close the opening of the recessed hole 34 (FIG. 1) and is screwed to the main body 10 (FIG. 1) of each carburetor 40. Therefore, the stopper member 36 of FIG. 3 functions as a retaining member for the heater 35 of each carburetor 40, at the same time restricts the mutual position of each carburetor 40 and prevents each carburetor 40 from moving due to engine vibration or the like. It also functions as a connecting member. The elongated stopper member 36 may have any shape as long as it has a desired rigidity, and may be formed of, for example, a channel member or the like in addition to the plate-shaped plate member as illustrated.

The electric heater 35 constitutes the heating device for the vaporizer according to the present invention. FIG. 4 is an electric circuit diagram showing the configuration of the first embodiment of the vaporizer heating device to which the present invention is applied. In this embodiment, the heater 35 mounted on the carburetor 40 is energized (turned on) when the temperature of the carburetor 40 is below a set value and the starter switch is off. On / off control is performed so as to heat 40.

In FIG. 4, 51 is a battery as a power source, 52 is a fuse of the battery 51 (for example, 30
A) and 53 are main switches (ignition switches), 54 is a starter switch, 55 is a magnetic switch, and 56 is a starter motor. An exciting part of the magnetic switch 55 is connected to the battery 51 via the main switch 53 and the starter switch 54, and a switch part of the magnetic switch 55 is directly connected to the battery 51.

Therefore, when the starter switch 54 is turned on (closed) with the main switch 53 turned on (closed), the magnetic switch 55 is turned on.
Is closed and the starter motor 56 is driven,
Start the engine. When the engine starts firing by starting the engine, the starter switch 5
4 is released and the starter motor 56 is stopped. In this way, it becomes the state of engine firing.

A switch section of a normally open type relay 58 is connected between the battery 51 and the main switch 53 via a fuse (for example, 15 A) 57, and the other side of the switch section is connected to the switch section. The heater 35 is connected. In the present embodiment in which the heater 35 for heating the carburetor is provided for each cylinder of the two-cylinder engine, two heaters 35 are connected in parallel. The main switch 53
The switch section of the normally closed type relay 59 is connected between the starter switch 54 and the starter switch 54, and the other side of the switch section is connected to the exciting section of the normally open type relay 58.

A carburetor temperature switch (vaporizer temperature sensor) 65 is connected to the other side of the exciting portion of the normally open type relay 58. The excitation part of the normally closed type relay 59 is connected to the battery 51 via the switch part of the magnetic switch 55. The vaporizer temperature switch 65 is set to be turned on (closed) when the vaporizer 40 is cold at a predetermined temperature (for example, about 10 ° C.) or lower, and turned off (open) when the vaporizer 40 is at the predetermined temperature or higher. . As the temperature of the carburetor 40 in this case, for example, the temperature of the carburetor main body 10, and further, the temperature in the vicinity of the slow system fuel outlet hole 33 or the slow system air intake port 43 of the carburetor main body 10 is used. Is preferred. The reason is that the temperatures of these parts are often directly related to the freezing phenomenon of the vaporizer 40.

According to the carburetor heating device having the circuit configuration of FIG. 4, if the main switch 53 is in the ON state,
When the vaporizer 40 is in a cold state below a predetermined temperature and the vaporizer temperature switch 65 is closed, the battery 51
Through the normally-closed type relay 59 to the exciting portion of the normally-open type relay 58, the normally-open type relay 58 is closed. This allows the battery 5
The electric current is supplied from 1 to each heater 35 through the relay 58, and the heater 35 causes each carburetor 4 to operate.
0 is heated, and the freezing phenomenon of the vaporizer 40 is prevented.

However, when the starter switch 54 is closed and the engine is started, the normally-closed type relay 59 is opened by the electric current supplied through the magnetic switch 55. The normally open type relay 58 with the current cut off
Is returned to the open state, and the energization of each heater 35 is also cut off. That is, even when the carburetor 40 tries to energize the heater 35 in a cold state at a predetermined temperature or lower, the normally-closed type relay 59 is turned on while the starter switch 54 is turned on and the starter motor 56 is operated. It is configured to open and stop energizing the heater 35.

According to the first embodiment described with reference to FIGS. 1 to 4, the condition that the temperature of the carburetor 40 is below a set value (for example, about 10 ° C.) is satisfied, and the starter current is not flowing. Under the condition, the heater 35 is energized to heat the carburetor 40.
It is possible to eliminate the energization of the heater 35 when there is no possibility that the icing phenomenon of 0 will occur (when it is unnecessary). Also,
Since the temperature of the vaporizer 40 itself is detected, the vaporizer 4
The on / off of the heater 35 can be easily and accurately controlled under the condition that the freezing phenomenon of 0 occurs or the condition close thereto, and therefore, the heater power can be used most efficiently and the heater 35 can be operated. It is possible to obtain a vaporizer warming device capable of minimizing the energy required for heating. Further, since the energization of the heater 35 is stopped while the starter switch 54 is on, the simultaneous operation of the starter motor 56 and the heater 35, which requires a relatively large current, is eliminated, so that the battery 51 It is also possible to eliminate the possibility of over-discharging.

FIG. 5 is an electric circuit diagram showing the configuration of the second embodiment of the vaporizer heating device to which the present invention is applied. In the present embodiment, in addition to the configuration of the first embodiment described above, the heater 35 is energized to heat the carburetor 40 under the additional condition that the outside air temperature is below a set value. ing. Therefore, in the electric circuit of FIG. 5, in addition to the circuit configuration of FIG. 4, an outside air temperature switch (outside air temperature sensor) 60 is connected in series to the exciting part of the normally open type relay 58 in addition to the carburetor temperature switch 65. It is connected so that the heater is not energized unless the outside air temperature is below a set value. That is, in this embodiment, the heater 35 is
When the temperature of the carburetor 40 is below the set value, the outside air temperature is below the set value, and the starter switch is off,
On / off control is performed so that the vaporizer 40 is heated by being energized (turned on).

The outside air temperature switch 60 is set to be turned on (closed) when the outside air is cold at a predetermined temperature (for example, about 10 ° C.) or lower, and turned off (open) when the temperature is higher than the predetermined temperature. . This embodiment is different from the first embodiment of FIG. 4 in the above points, and has substantially the same configuration in the other parts, and the corresponding parts are denoted by the same reference numerals,
Detailed description thereof will be omitted. The carburetor temperature switch 65 in this embodiment is also the same as in the case of the first embodiment.
The carburetor 40 is set to be turned on when the temperature of the carburetor 40 is lower than a predetermined value (for example, about 10 ° C.) and turned off (open) when the temperature is higher than the predetermined temperature.

According to the second embodiment of FIG. 5, when the main switch 53 is in the ON state, the outside air is in a cold state below a predetermined temperature, the outside air temperature switch 60 is closed, and the carburetor 40 is When the carburetor temperature switch 65 is closed in a cold state below a predetermined temperature, the normally-open type relay 58 is closed, whereby the battery 5
A current is supplied from 1 to each heater 35 through the relay 58, and each heater 35 heats each vaporizer 40. However, also in the present embodiment, when the engine is started by closing the starter switch 54, the current to the normally open type relay 58 is shut off and returned to the open state, and both the outside air temperature and the carburetor temperature are set. Even if the temperature is lower than the temperature, the power supply to the heater 35 is stopped.

According to the second embodiment of FIG. 5, both conditions that the carburetor 40 is below the set temperature (for example, 10 ° C.) and the outside air temperature is below the set value (for example, about 10 ° C.) are satisfied. The heater 35 is energized to heat the vaporizer 40 on condition that the starter current does not flow, so that the heater 35 is energized when the vaporizer 40 does not freeze. It is possible to obtain a carburetor warming device that can more reliably eliminate this and further reduce the electric power for operating the heater 35. Further, as in the case of the first embodiment, the battery 51 is stopped by stopping the energization of the heater 35 when the engine is started.
It is also possible to eliminate the possibility of over-discharging.

FIG. 6 is an electric circuit diagram showing the construction of a third embodiment of the vaporizer heating device to which the present invention is applied. In addition to the configuration of the second embodiment described above, this embodiment is configured to cut off the power supply to the heater 35 when the engine is not firing. Therefore, in addition to the circuit configuration of FIG. 5, the electric circuit of FIG. 6 detects the presence or absence of engine firing (ignition signal) and turns off the heater 35 when not firing (heater control unit). 8
0) is added.

That is, also in FIG. 6, as in the case of FIG. 4 and FIG. 5, by turning on the starter switch 54 with the main switch 53 turned on, the magnetic switch 55 is closed and the battery 51 starts the starter. It is configured to drive the motor 56 to start the engine to a firing state. A switch part of a normally open type relay 58 is connected to the battery 51 via a fuse 57, and two heaters 35 are connected in parallel to the other side of the switch part. Further, the battery 51 is connected to a switch portion of a normally closed type relay 59 via the main switch 53, and the other side of the switch portion is connected to an exciting portion of the normally open type relay 58. .

Therefore, in the third embodiment of FIG. 6, the other side of the exciting portion of the normally-open type relay 58 is not direct as in the case of FIG. 5, but the heater control unit 8
0 through the outside temperature switch (outside temperature sensor) 60
And a carburetor temperature switch (vaporizer temperature sensor) 65 is connected in series. The outside air temperature switch 60 and the carburetor temperature switch 65 are also turned on when the outside air and the carburetor 40 are below a predetermined temperature (for example, both about 10 ° C.), and turned off above the predetermined temperature. It is set. The exciting part of the normally-closed type relay 59 is connected to the battery 51 via the switch part of the magnetic switch 55, as in the case of FIGS. 4 and 5.

Therefore, in the electric circuit of FIG.
When the main switch 53 is in the ON state and the outside air temperature switch 60 and the carburetor temperature switch 65 are closed, in addition to the starter switch 54 being in the open (OFF) state, the heater control unit 80 Is in the closed (on) state,
An electric current is supplied from the battery 51 to each heater 35 to heat the vaporizer 40.

In FIG. 6, the battery 51 includes
Through the main switch 53, the engine ignition circuit 7
The heater control unit 80 is connected between the ignition coil 72 of 0 and the igniter 73. The engine ignition circuit 70 includes a kill switch 7
1. Ignition coil 72 and igniter 73
Are connected in series. Although the engine ignition circuit 70 is generally provided, it is not directly related to the configurations of the first embodiment shown in FIG. 4 and the second embodiment shown in FIG. It is omitted in the electric circuit.

The heater control unit 80
Detects the presence / absence of an ignition signal from the engine ignition circuit, and when there is an ignition signal (during engine firing), the exciting part of the normally open type relay 58, the outside air temperature switch 60, and the carburetor temperature. The switch 65 is electrically connected to operate so as to be electrically disconnected when there is no ignition signal.

In FIG. 6, in the heater control unit 80, a terminal B connected to the battery 51 via the main switch 53 and a terminal S connected to an ignition signal supply unit for the igniter 73.
A terminal C connected to the exciting part of the normally open type relay 58, a terminal E connected to the outside air temperature switch 60 and the carburetor temperature switch 65, and a ground terminal G are provided. When the presence of the ignition signal is detected by the terminal S, the terminals C and E are electrically connected, and when the absence of the ignition signal is detected, the connection between the terminals C and E is cut off. Operate.

According to the third embodiment described with reference to FIG. 6 above, when the engine is in the firing state, both the outside air temperature and the temperature of the carburetor 40 satisfy the condition that they are below the set values, and the starter current flows. Since the heater 35 is energized under the condition that it is not turned on, and the energization to the heater 35 is unconditionally stopped when the engine is not firing, the above-mentioned first and second embodiments Similarly to the case, the starter motor which can minimize the power consumption by not energizing the heater 35 when there is no risk of the carburetor 40 freezing (when it is not needed) and at the same time requires a large current In addition to eliminating the possibility of over-discharging the battery 51 by eliminating the simultaneous operation of 56 and the heater 35, the main switch 3 off forgotten, or vaporizer heating device is obtained which can without the possibility of the battery over-discharge in a situation such as engine stall during idling standing.

Further, according to each of the above embodiments, as shown in FIG. 1, the fuel outlet hole 33 of the slow system 18 of the carburetor 40 is provided.
An electric heater 35 is mounted in the vicinity of the heater, and the fuel outlet hole 33 is heated by the heater 35 when the temperature of the vaporizer is lowered in a cold atmosphere. Excessive temperature reduction of the fuel outlet hole 33 is also prevented by the dissipation, and it is possible to effectively prevent freezing of moisture in the air near the fuel outlet hole 33. That is, unlike the main system, the slow system has no moving parts, and immediately after the start in cold weather, particularly the small fuel outlet hole 33 (for example, 0.7 mm in diameter) is easily affected by the icing. The air-fuel ratio (for example, 3000 rpm from idling) may be disturbed. However, according to the above-described embodiment, even if the water near the fuel outlet hole 33 freezes during cold weather and the fuel is difficult to come out, the heater 35
By this, the frozen water can be quickly dissolved. Therefore, even in cold weather, the engine rotation can be maintained as usual without disturbance in the air-fuel ratio during low-speed operation, and restart can be performed smoothly.

Further, according to each of the above embodiments, as shown in FIGS. 1 and 2, when the heater 35 is inserted into the recessed hole 34, a gap between the heaters 35 is filled with a heat transfer viscous substance such as heat transfer grease. Therefore, the heating efficiency and responsiveness of the fuel outlet hole 33 by the heater 35 can be improved, and furthermore, the recessed hole 34 does not have a fastening mechanism such as a screw and the hole 34 can be formed by the casting surface itself, It is also possible to reduce processing man-hours. Further, the concave hole 34 is formed downward, the heater 35 is inserted from below, and the plate-shaped stopper member 3 is formed.
Since it is prevented from coming off in step 6, the appearance can be made to be the same as that of a normal vaporizer, and a vaporizer heating device that is advantageous in terms of design can be obtained. Furthermore, when a plurality of vaporizers 40 are arranged in parallel, the stopper member 36 can also serve as a connecting member for regulating the mutual positions of the vaporizers 40, so that the number of parts can be reduced and the size and weight can be reduced. It can also be planned.

FIG. 7 is a side view showing a specific example of an engine equipped with a heating device for a vaporizer according to the present invention. In FIG. 7, 85 is a crankcase, 86 is a cylinder, 87 is a cylinder head, 88 is an air cleaner, and the carburetor 40 is for introducing intake air from the air cleaner 88 to an intake port (not shown) of the cylinder head 87. It is connected in the middle of the intake passage 89. The heater 35 for preventing the freezing phenomenon of the vaporizer 40 is attached to a desired position of the vaporizer body 10 (FIG. 1).

In the configuration of FIG. 7, the carburetor temperature switch 65
A switch (sensor) that is turned on / off in response to the temperature of the carburetor body 10 is used as the outside temperature switch, and an intake air temperature that is turned on / off in response to the air temperature inside the air cleaner 88 is used as the outside air temperature switch (sensor) 60. The switch is being used. The carburetor temperature switch 65 is located at a position where an icing phenomenon is likely to occur in the carburetor, for example, the slow fuel outlet 33
Alternatively, it is preferable that the air intake port 43 of the slow system is arranged to be turned on / off in response to the temperature at or near the position of the air intake port 43. Also, the outside temperature switch 6
0 may be configured by a switch that detects the outside air temperature (or a temperature corresponding thereto) at an appropriate place other than the air cleaner 88.

FIG. 8 is a partially cutaway front view of the carburetor equipped with the carburetor temperature switch 65 seen from the air cleaner 88 side, and FIG. 9 is an external side view of the carburetor of FIG. FIG. 9 is a central longitudinal sectional view of the vaporizer shown in FIG. 8. 8 to 1
In the carburetor No. 0, the carburetor temperature switch 65 is mounted so as to detect the temperature of the carburetor main body 10 in the vicinity of the slow system air intake port 43 of the carburetor main body 10 (FIG. 1).

FIG. 11 is an electric circuit diagram showing the construction of the fourth embodiment of the vaporizer heating apparatus to which the present invention is applied. In the present embodiment, the heater 35 is energized (turned on) to turn on the carburetor 40 when the outside air temperature is below the set value, the engine temperature is below the set value, and the starter switch is off. It is controlled to turn on and off so as to heat. As the temperature of the engine, the temperature of the cylinder, the temperature of the cylinder head, the temperature of the crankcase, the temperature of the radiator, the temperature of the engine oil, the temperature of the cooling water of the radiator and the like are used.

This embodiment is similar to the second embodiment of FIG.
The engine temperature switch 61 is used instead of the carburetor temperature switch 65, and the other parts have substantially the same configuration. Therefore, in FIG. 11, portions corresponding to the respective portions in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the fourth embodiment of FIG. 11, as in the case of the first embodiment of FIG. 4, the starter switch 54 is turned on (closed) with the main switch 53 turned on (closed) in FIG. The magnetic switch 55 is closed and the starter motor 5 is closed.
6 is driven and the engine is started. When the engine starts to fire by starting the engine, the starter switch 54 is released to start the starter motor 5
Stop 6 In this way, the engine firing state is entered.

A switch portion of a normally open type relay 58 is connected between the battery 51 and the main switch 53, and the carburetor 40 is provided on the other side of the switch portion.
The heater 35 for heating is connected. A switch portion of a normally closed type relay 59 is connected between the main switch 53 and the starter switch 54,
The other side of the switch section is connected to the exciting section of the normally open type relay 58.

In this embodiment, an outside air temperature switch (outside air temperature sensor) 60 and an engine temperature switch (engine temperature sensor) 61 are connected in series to the other side of the exciting portion of the normally open type relay 58. . Also in this embodiment, the exciting part of the normally closed type relay 59 is connected to the battery 51 via the switch part of the magnetic switch 55. Further, the outside air temperature switch 60 sets the outside air to a predetermined temperature (for example, about 10
It is set to be turned on (closed) when the temperature is cold (° C) or lower, and turned off (open) when the temperature is higher than the predetermined temperature,
The engine temperature switch 61 is turned on (closed) when the engine is in a cold state below a predetermined temperature (for example, about 50 ° C.), and is turned off (open) when the engine temperature is above the predetermined temperature.
Is set to.

According to the carburetor heating device having the circuit configuration of FIG. 11, when the main switch 53 is in the ON state, the outside air temperature is below the predetermined temperature and the outside air temperature switch 60 is closed. When the engine temperature switch 61 is closed when the engine is cooled to a predetermined temperature or lower, a current is supplied from the battery 51 to the exciting portion of the normally open type relay 58 through the normally closed type relay 59. Flows, and the normally open type relay 58 is closed. As a result, current is supplied from the battery 51 to each heater 35 through the relay 58,
The vaporizers 40 are heated by the heater 35 to prevent the vaporization phenomenon of the vaporizers.

However, also in this embodiment, when the starter switch 54 is closed and the engine is started,
The normally-closed type relay 59 is opened by the current supplied through the magnetic switch 55, and the normally-open type relay 58 is returned to the open state, so that energization to each heater 35 is cut off. That is, even when trying to energize the heater 35 in a cold state in which the outside air temperature is lower than or equal to the set temperature (for example, 10 ° C.) and the temperature of the encin is lower than or equal to the set temperature (for example, 50 ° C.)
While the starter motor 56 is operating, the energization of the heater 35 is stopped.

According to the fourth embodiment described with reference to FIG. 11, both the outside air temperature is below the set value (eg, about 10 ° C.) and the engine temperature is below the set value (eg, about 50 ° C.). Since the heater 35 is energized to heat the carburetor on condition that the starter current does not flow, the carburetor is not likely to be frozen (heating is performed). It is possible to eliminate the energization of the heater 35 when it is unnecessary).
It is possible to obtain a warming device for a carburetor capable of minimizing the energy for operating the. Also, since the energization of the heater 35 is stopped while the starter switch 54 is on, the possibility of over-discharging the battery 51 can be eliminated by eliminating the simultaneous operation of the starter motor 56 and the heater 35. .

FIG. 12 is an electric circuit diagram showing the construction of the fifth embodiment of the vaporizer heating apparatus to which the present invention is applied. In the present embodiment, in addition to the configuration of the above-described fourth embodiment, the power supply to the heater 35 is cut off when the engine is not firing. Therefore, FIG.
In addition to the circuit configuration of FIG. 11, the electric circuit of FIG. 11 includes a control circuit (heater control unit 80) that detects the presence or absence of engine firing (ignition signal) and turns off the heater 35 when not firing. It has a configuration.

That is, also in FIG. 12, as in the case of the fourth embodiment of FIG. 11, by turning on the starter switch 54 with the main switch 53 turned on, the magnetic switch 55 is closed to close the battery 51. Is configured to drive the starter motor 56 to start the engine and bring it into a firing state. A switch part of a normally open type relay 58 is connected to the battery 51 via a fuse 57, and two heaters 35 are connected in parallel to the other side of the switch part. Further, the battery 51 is connected to a switch portion of a normally closed type relay 59 via the main switch 53, and the other side of the switch portion is connected to an exciting portion of the normally open type relay 58. .

Therefore, in the fifth embodiment of FIG. 12, the other side of the exciting portion of the normally open type relay 58 is not directly connected as in the case of FIG. 11 but via the heater control unit 80. Outside temperature switch (outside temperature sensor)
60 and an engine temperature switch (engine temperature sensor) 61 are connected in series. The outside air temperature switch 60 and the engine temperature switch 61 are set to be turned on when the outside air temperature and the engine temperature are below a predetermined value, and turned off when the outside air temperature and the engine temperature are above a predetermined value, respectively. For example, the outside air temperature switch 60 is set to be turned on when the outside air temperature is 10 ° C. or lower, and the engine temperature switch 61 is set to be turned on when the engine temperature is 50 ° C. or less.

The exciting part of the normally closed type relay 59 is
Similar to the case of FIG. 11, the magnetic switch 55
It is connected to the battery 51 via the switch section. Therefore, in the electric circuit of FIG. 12, when the main switch 53 is in the on state and the outside air temperature switch 60 and the engine temperature switch 61 are closed, the starter switch 54 is in the open (off) state. In addition, on condition that the heater control unit 80 is in the closed (ON) state, a current is supplied from the battery 51 to each heater 35 to heat the vaporizer.

In FIG. 12, the heater control unit 80 is connected to the battery 51 via the main switch 53 from between the ignition coil 72 and the igniter 73 of the engine ignition circuit 70. The engine ignition circuit 70 includes a kill switch 71, an ignition coil 72 and an igniter 7.
3 is connected in series. Although the engine ignition circuit 70 is generally provided,
Since it is not directly related to the configuration of the vaporizer heating device according to the fourth embodiment of FIG. 11, it is omitted in the electric circuit of FIG.

The heater control unit 80
Detects the presence / absence of an ignition signal from the engine ignition circuit, and when there is an ignition signal (in the case of engine firing), the exciting portion of the normally open type relay 58, the outside air temperature switch 60, and the engine temperature switch. It is electrically connected to 61, and operates so as to be electrically disconnected when there is no ignition signal.

In FIG. 12, the heater control unit 80 includes a terminal B connected to the battery 51 via the main switch 53, a terminal S connected to an ignition signal supply unit for the igniter 73, and A normally open type relay 58 is provided with a terminal C connected to the exciting portion, a terminal E connected to the outside air temperature switch 60 and the engine temperature switch 61, and a ground terminal G. When the presence of the ignition signal is detected by the terminal S, the terminals C and E are electrically connected, and when the absence of the ignition signal is detected, the connection between the terminals C and E is cut off. Operate.

According to the fifth embodiment described with reference to FIG. 12 above, when the engine is in the firing state, both the outside air temperature and the engine temperature satisfy the condition that they are below the set values, and the starter current does not flow. Since the heater 35 is energized under the conditions described above, and the energization of the heater 35 is unconditionally stopped when the engine is not firing, as in the case of the fourth embodiment described above, It is possible to minimize the power consumption by not energizing the heater 35 when there is no risk of freezing (when heating is not required).
In addition to eliminating the simultaneous operation of the starter motor 56 and the heater 35, which requires a large current, the possibility of over-discharging the battery 51 can be eliminated.
A heating device for a carburetor that can eliminate the possibility of battery over-discharging in situations such as forgetting to turn off item 3 or stalling when left idle is obtained.

FIG. 13 is a side view showing a specific example of an engine equipped with the heating device for the vaporizer shown in FIG. 11 or 12. In FIG. 13, 85 is a crankcase, 86
Is a cylinder, 87 is a cylinder head, 88 is an air cleaner, and the carburetor 40 is connected in the middle of an intake passage 89 for introducing intake air from the air cleaner 88 to an intake port (not shown) of the cylinder head 87. . Vaporizer 40
The heater 35 for preventing the freezing phenomenon is attached to a desired position of the vaporizer main body 10 (FIG. 1).

In the configuration of FIG. 13, an intake air temperature switch that is turned on / off in response to the air temperature in the air cleaner 88 is used as the outside air temperature switch (sensor) 60, and an engine temperature switch 61 of the crankcase 85 is used. A switch is used that is turned on / off in response to the temperature of engine oil in the oil line section. That is, in this embodiment, the temperature of the engine is detected by the temperature of the engine oil.

The outside air temperature switch 60 may be a switch for detecting the outside air temperature (or a temperature corresponding to it) at an appropriate place other than the air cleaner 88. In addition, the engine temperature switch 61 may be a switch that detects the oil temperature at another suitable place such as the oil pan portion of the crankcase 85 when detecting the temperature of the engine oil. Furthermore, in the above-described embodiment, the engine temperature is detected by the temperature of the engine oil. However, the temperature of the cylinder 86, the temperature of the cylinder head 87,
The temperature of the crankcase 85, the temperature of the radiator, the temperature of the cooling water of the radiator, etc. may be used, and in such a case, the mounting position of the engine temperature switch 61 is suitable for detecting the temperature of the corresponding place. Selected for position.

FIG. 14 is a graph exemplifying the temperature change of the carburetor when the engine starts from the sub-zero temperature −α ° C., the chain line shows the case where no heater is used, and the solid line shows the heater 35 used in the above embodiment. Indicate the case. FIG.
In the case where the heater is not used, as shown by a chain line, a temperature drop (for example, a temperature drop of about 5 ° C. to 8 ° C.) may occur after the start (start) due to the vaporization heat dissipation. Although it is easy to occur, according to the above embodiment, as shown by the solid line, it is possible to monotonously increase the temperature of the carburetor from the start, freeze is effectively prevented, and the rotation of the engine is maintained as usual. It becomes possible to do. In addition, it becomes possible to easily restart in cold weather.

FIG. 15 shows a temperature β ° C. slightly higher than the freezing point temperature.
(Eg, a temperature in the range of 1 ° C. to 5 ° C.) is a graph illustrating a change in the temperature of the carburetor when the engine is started from a temperature of 1 ° C. to 5 ° C. Here is an example. Also in the case of FIG. 15, in the case where the heater is not used, as shown by the chain line, a temperature drop (e.g., a temperature drop of about 5 ° C. to 8 ° C.) occurs due to vaporization heat dissipation after the start (start).
May freeze below freezing. On the other hand, according to the above-described embodiment using the heater 35, as shown by the solid line, the temperature of the vaporizer rises monotonously from the start and does not fall below the freezing point, so that freezing can be eliminated, The rotation of the engine can be maintained as usual, and the restart can be easily performed.

In the slow system 18 of the carburetor as shown in FIG. 1, the freezing may occur near the air intake port 43 during cold weather. Therefore, as shown by a two-dot chain line 35 in FIG. 1, the heater 35 may be mounted near the air intake port 43 in some cases. In that case, a configuration is adopted in which a concave hole is formed in the vicinity of the air intake port 43 of the carburetor main body 10, the heater 35 is inserted into the concave hole, and the heater 35 is retained and held by a stopper member. That is, the configuration for mounting the heater 35 and the on / off control described with reference to FIGS. 1 to 5 may be implemented in the vicinity of the air intake port 43 with the same configuration.
The mounting of the heater 35 in the vicinity of the air intake port 43 as described above can be carried out independently, or can be carried out together with the mounting of the heater 35 in the vicinity of the fuel outlet hole 33. The same effect as that of the embodiment can be obtained.

The heating device for the vaporizer according to the present invention is
It can be applied to the carburetor of the engine of any vehicle as long as it is a vehicle that runs on an engine, such as an automobile, a two-wheeled vehicle, a four-wheeled vehicle, etc., and similar operational effects can be obtained. is there. Further, in the above embodiment, the variable venturi type carburetor as shown in FIG. 1 has been described as an example, but the present invention can be similarly applied to other forms of carburetor. The effect of is obtained.

[0068]

As is apparent from the above description, according to the invention of claim 1, an electric heater is attached to the vaporizer.
In the carburetor heating device, power supply → main switch →
Starter switch → Magnetic switch excitation section
The first circuit portion connected in series in the order of
Switch part of the magnetic switch → Starter
A second circuit part connected in series in the order of the motor, and
Branch from between the power supply of the first circuit part and the main switch
Then, the switch part of the normally open type relay → The electric heater
A third circuit portion connected in series in the order of
Of the main switch and starter switch of the circuit part of 1.
Switch section of normally closed type relay branching from between →
Exciting part of normally open type relay → Detects carburetor temperature
Fourth circuit connected in series in the order of vaporizer temperature switch
Part and magnetic switch of the second circuit part
Branch from between the switch part and the starter motor
Connect to the exciting part of the normally closed relay of the fourth circuit part.
And a fifth circuit portion connected to the carburetor, the temperature of the carburetor is below a set value, and the starter switch is off,
Since the electric heater is energized to heat the carburetor, the heating operation of the carburetor can be controlled in accordance with the icing phenomenon occurrence conditions, and the electric power to the heater is eliminated as much as possible when not needed. As a result, the energy for operating the heater can be minimized to effectively prevent the icing phenomenon of the carburetor, and the possibility of battery over-discharging when driving the starter motor can be eliminated. A vaporizer warming device is provided.

According to the invention of claim 2, in addition to the structure of claim 1 , the fourth circuit portion includes the carburetor temperature switch.
Outside temperature switch that detects the outside temperature in series with the switch
When the outside air temperature is lower than a set value, the electric heater is energized to heat the carburetor, so that the carburetor heating that can achieve the above effect more efficiently can be achieved. A device is provided. According to the invention of claim 3, the above
In addition to the configuration of claim 1, the main of the first circuit portion
Branch from between the switch and the starter switch to
A sixth circuit portion connected to a gin ignition circuit,
Exciting part and front of the normally open type relay of the fourth circuit part
Heater control unit between the vaporizer temperature switch and
Units are connected in series and the heater control unit
The knit is the ignition signal of the engine ignition circuit.
If there is a signal, the normally open type
The exciter of the relay and the carburetor temperature switch are electrically connected.
To be electrically disconnected when there is no signal.
Configured, since a structure for interrupting the power supply to the electric heater when the engine is not firing,
In addition to the above effects, there is provided a carburetor heating device capable of interrupting energization to the heater even at the time of engine stalling and the like and further eliminating energization to the heater when unnecessary.

According to the invention of claim 4, the structure of claim 1 is provided.
In the engine temperature switch, which detects the engine temperature
Switch is connected instead of the carburetor temperature switch, when the engine temperature is below a set value and the starter switch is off, the electric heater is energized to heat the carburetor. By minimizing the power supply to the heater when it is not needed, the energy for operating the heater can be minimized and the icing phenomenon of the carburetor can be efficiently prevented, and moreover, when starting the starter motor. Provided is a carburetor heating device capable of eliminating the possibility of battery over-discharge.

According to the invention of claim 5, in addition to the structure of claim 1 , a main switch of the first circuit portion is provided.
Branch from between the starter switch and the engine ignition
The temperature of the engine with a sixth circuit part connected to the road
The engine temperature switch that detects
Connected instead of the switch, the normally open portion of the fourth circuit portion.
Type relay exciter and the engine temperature switch
The heater control units are connected in series between
The heater control unit is
The presence or absence of an ignition signal from the ignition circuit
When there is a signal, the excitation part and front of the normally open type relay
The engine temperature switch is electrically connected and the signal
When the engine is not fired , it is configured to electrically shut off, and when the engine is not firing, the electrical heater is shut off. Therefore, in addition to the above effects,
Provided is a carburetor warming device capable of cutting off the power supply to the heater even when the engine is stalled, and further eliminating the power supply to the heater when unnecessary.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the configuration of a main part of an embodiment of a vaporizer equipped with a heating device according to the present invention.

FIG. 2 is an exploded perspective view of a heater mounting structure in FIG.

FIG. 3 is a schematic perspective view illustrating a state in which heaters of a plurality of vaporizers are held by one stopper member.

FIG. 4 is an electric circuit diagram showing the configuration of the first embodiment of the vaporizer heating device to which the present invention is applied.

FIG. 5 is an electric circuit diagram showing the configuration of a second embodiment of the vaporizer heating device to which the present invention is applied.

FIG. 6 is an electric circuit diagram showing a configuration of a vaporizer heating device according to a third embodiment of the present invention.

FIG. 7 is a side view showing a specific example of an engine having a carburetor heating device according to the present invention.

FIG. 8 is a partially cutaway front view of a vaporizer to which a vaporizer temperature switch according to the present invention is attached.

9 is a side view of the vaporizer of FIG. 8. FIG.

10 is a vertical cross-sectional view of the central portion of the vaporizer shown in FIG.

FIG. 11 is an electric circuit diagram showing a configuration of a vaporizer heating device according to a fourth embodiment of the present invention.

FIG. 12 is an electric circuit diagram showing a configuration of a vaporizer heating device according to a fifth embodiment of the present invention.

FIG. 13 is a side view showing another specific example of the engine having the carburetor heating device according to the present invention.

FIG. 14 is a graph illustrating the change in carburetor temperature when starting at a temperature below freezing.

FIG. 15 is a graph illustrating a change in carburetor temperature when starting at a temperature higher than the freezing point temperature.

[Explanation of symbols]

 10 Vaporizer Main Body 11 Intake Passage 12 Float Chamber 15 Needle Valve 16 Butterfly Throttle Valve 17 Main System 18 Slow System 19 Main Nozzle 21 Slide Piston 22 Jet Needle 23 Diaphragm 26 Main System Fuel Outlet 28 Main System Air Intake 29 Main Air Jet 30 Slow Jet 33 Slow Fuel Outlet Hole 34 Recessed Hole 35 Electric Heater 36 Stopper Member 40 Vaporizer 43 Slow Air Intake 51 Battery 53 Main Switch 54 Starter Switch 55 Magnetic Switch 56 Starter Motor 58 Normally Open Type Relays 59 Normally closed relays 60 Outside air temperature switch (sensor) 61 Engine temperature switch (sensor) 65 Vaporizer temperature switch (sensor) 70 Engine Ignition circuit 71 kill switch 72 ignition coil 73 igniter 80 heater control unit 85 crankcase 86 cylinder 87 cylinder head 88 air cleaner 89 the intake passage

Claims (5)

(57) [Claims] 1. An electric heater (35) is attached to the vaporizer.
In the attached carburetor heating device, turn on the power supply (51) →
In switch (53) → Starter switch (54) →
In series with the magnetizing part of the magnetic switch (55)
The connected first circuit portion and the power source (51) → the above
Switch part of magnetic switch (55) → star
The second circuit connected in series in the order of the starter motor (56).
The main part of the power supply (51) for the road part and the first circuit part
A normally open type relay that branches from between the switches (53)
(58) switch section → of the electric heater (35)
A third circuit portion connected in series in order, and the first circuit
Road main switch (53) and starter switch
Normally closed relay (59) branched from between (54)
Switch part → Excitation of the normally open type relay (58)
-> Vaporizer temperature switch (6 to detect the temperature of the vaporizer
5) a fourth circuit portion connected in series in the order of:
The switch of the magnetic switch (55) of the circuit part of 2
Branch between the switch and the starter motor (56)
Of the normally closed type relay (59) of the fourth circuit part.
A fifth circuit portion connected to the excitation unit, and when the temperature of the carburetor is below a set value and the starter switch is off, the electric heater (35) is energized to heat the carburetor. A heating device for a vaporizer characterized by being. 2. The fourth circuit portion is the vaporizer temperature.
Outside to detect outside air temperature in series with switch (65)
The carburetor according to claim 1 , further comprising an air temperature switch (60), wherein when the outside air temperature is below a set value, the electric heater (35) is energized to heat the carburetor. Heating device. 3. A main switch of the first circuit portion.
Branch from between (53) and starter switch (54)
Sixth circuit connected to the engine ignition circuit (70)
A normally open type reconnection of the fourth circuit portion.
Laye (58) excitation part and the vaporizer temperature switch (6
The heater control unit (80) is
The heater control unit connected in series
(80) is an ignition of the engine ignition circuit (70)
If there is a signal,
Exciting part of normally open type relay (58) and temperature of the carburetor
When there is no such signal when it is electrically connected to the switch (65)
The electric heater (35) is configured to electrically shut off when the engine is not firing.
The carburetor warming device according to claim 1, wherein power to the vaporizer is cut off. 4. An engine temperature for detecting an engine temperature.
Degree switch (61) replaces the carburetor temperature switch
The electric heater is connected when the engine temperature is below the set value and the starter switch is off.
(35) is energized to heat the vaporizer.
The warming device for the vaporizer according to claim 1 . 5. A main switch of the first circuit portion.
Branch from between (53) and starter switch (54)
Sixth circuit connected to the engine ignition circuit (70)
The engine temperature switch is equipped with
Switch (61) connected instead of the carburetor temperature switch
And the normally open type relay of the fourth circuit portion.
Exciting part (58) and the engine temperature switch (61)
A heater control unit (80) is connected in series between
Connected to the heater control unit (8
0) is the ignition of the engine ignition circuit (70)
The presence or absence of a signal
Type relay (58) excitation part and the engine temperature
It is electrically connected to the switch (61) and when there is no such signal
Is configured to electrically isolated, the engine carburetor of the warming device according to claim 1, characterized in that interrupting the energization of the electric heater (35) when not firing.