JP2001099044A - Starter of glow engine for model - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a plug temperature from rising higher than it is required, to suppress the knocking in starting and to reduce the load applied to a motor to reduce power consumption. SOLUTION: When a start command is inputted, a glow plug is heated to a red heat state (1-2). Thereafter, the heating is stopped (2), the glow plug is strongly heated again after the lapse of 0.1 second from the stop of the heating of the glow plug, and a starter motor is also started (3). When the start command is stopped, the starting of the starter motor is cut (4), the strong heating and weak heating of the glow plug are alternately repeated for 2-3 seconds after the cut of the start command so that the plug temperature of the glow plug is kept at 200-800 deg.C (3-5). Thereafter, the heating of the glow plug is stopped. (5).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a model aircraft such as a model airplane, a model helicopter, a model car, a model ship, etc., which uses a glow fuel composed of a liquid mixed fuel of alcohol, lubricating oil and additives. The present invention relates to a starting device for a glow engine that is an internal combustion engine that is ignited and operated by a glow plug.

[0002]

2. Description of the Related Art For example, model airplanes, model helicopters,
BACKGROUND ART Various model machines such as model cars and model ships are equipped with a glow engine that is an internal combustion engine that uses a liquid mixed fuel of alcohol, lubricating oil, and additives and is ignited and operated by a glow plug.

[0003] When starting this type of glow engine, the following methods (1) and (2) are generally employed. In the method (1), as shown in FIG. 4, the string 21a of the recoil device 21 is pulled by hand, and the flywheel 22 of the engine is rotated manually. In the method (2), as shown in FIG.
2 is rotating. More specifically, the starting device 23
The flywheel 26 is attached to a shaft of a starting motor 25 that uses a starting motor battery 24 as a driving power source. The flywheel 26 is rotated by driving the starting motor 25, and the rotated flywheel 26
Is pressed against the flywheel 22 of the engine to rotate the flywheel 22.

[0004]

However, the above-mentioned method (1) has a problem that it requires "force" and "knack" when rotating the flywheel 22, and requires skill. In addition, once the fuel becomes excessive, the cylinder piston may not be able to cross the top dead center and the cylinder may lock up. The situation needed to be alleviated.

In the above method (2), the starting motor 25, the starting motor battery 24 and the glow plug 27 ignition power source are separately required at the time of starting, and there is a problem that the equipment is excessively large. .

Further, in both of the above methods (1) and (2), the glow plug 27 is completely red-heated and started, so that there is a problem that a large amount of electric power is consumed for heating the glow plug.

[0007] The above-described phenomenon of the locked state of the cylinder is also one of the causes induced by the complete glow of the glow plug. In addition, even if the flywheel starts rotating at the start, knocking is likely to occur if the glow plug is kept completely red, and at that time an excessive load will be momentarily applied to the starting motor, consuming large current There were drawbacks.

In view of the above, the present invention has been made in view of the above-mentioned problems, and it is possible to suppress knocking at the time of starting without increasing the plug temperature more than necessary, to reduce a load on a motor, and to reduce power consumption. It is an object of the present invention to provide a starting device for a model glow engine that can be designed.

[0009]

In order to achieve the above object, a starting device for a model glow engine according to the first aspect of the present invention provides a starting command for starting a glow engine having a starting motor and a glow plug. Input means for inputting, and when the start command is input from the input means, heating the glow plug to a red-hot state and then stopping the heating of the glow plug. After the lapse of time, the glow plug is heated again and the start motor is started.When the start command from the input means is cut off, the start of the start motor is stopped, and the start command from the input means is cut off. Heating the glow plug so that the plug temperature of the glow plug is maintained at 200 to 800 ° C. until a predetermined time has passed since A control device for controlling the starting of the starting motor and the heating of the glow plug so as to stop the heating of the glow plug; a single power supply connected to the control device; and A power switch for turning on / off the power supply to the control device, wherein when the power switch is on, the control device controls the power supplied from the single power supply, the starting motor,
A desired power is supplied to the glow plug and the receiver.

[0010]

FIG. 1 is a view showing the overall configuration of a starting device for a model glow engine according to the present invention, FIG. 2 is a circuit block diagram of a control unit which is a main part of the starting device, and FIG. 5 is a drive timing chart of a glow plug and a cell motor by the device.

As shown in FIG. 1, a starting device 1 according to the present embodiment comprises:
A control unit 2 is provided as a control device. The control unit 2 includes a power switch 3, a push button switch 4 as input means, a power supply 5 composed of, for example, a NiCd battery, and a cell motor (starting motor) 6.
Power terminal, ground terminal of the engine body 7 (GN
D), the glow plug 8 and the receiver 9 are connected via conductive wires.

As shown in FIG. 2, the control unit 2 includes a power switch 2a, a regulator 2b,
It is schematically configured including a U2c, a motor control unit 2d, and a voltage conversion circuit 2e.

The power switch section 2a includes a switching element that is turned on and off in response to operation of a power switch 3 composed of, for example, a hand switch. The input terminal of the power switch unit 2a is connected to the power supply 5, the output terminal is connected to the CPU 2c via the regulator unit 2b, the power terminal (+) of the cell motor 6, the voltage conversion circuit 2
e, connected to predetermined empty channels of the receiver 9 respectively.

When the power switch 3 is turned on, the power switch section 2a conducts electricity between the power supply 5 and each of the CPU 2c, the cell motor 6, and the receiver 9.

When the power switch 2a is turned on, the CPU 2c operates the power switch 2a and the regulator 2b.
, A stabilized voltage (power) is supplied from the power supply 5. A signal from the push button switch 4 is input to the CPU 2c. Then, when an ON signal indicating a start command is input from the push button switch 4 in a state where the driving voltage is supplied from the power supply 5, the CPU 2c operates at the timing shown in the timing chart of FIG. In order to carry out the heating control and the driving control of the starter motor 6, a command is outputted to the motor control unit 2d and the voltage conversion circuit 2e.

In this embodiment, a signal indicating a start command is inputted to the CPU 2c by pressing the push button switch 4. For example, a radio is used as an input means, and remote control from this radio is performed. A signal indicating a start command may be input to the CPU 2c.

The motor control unit 2d controls the rotation / stop of the starter motor 6 based on a command from the CPU 2c. That is, when a motor ON command is input from the CPU 2c, the motor controller 2d
The rotation is controlled. On the other hand, when a motor-off command is input from the CPU 2c, the stop control of the cell motor 6 is performed.

When the power switch 3 is turned on, a voltage (power) is supplied from the power supply 5 to the voltage conversion circuit 2e via the power switch unit 2a. The voltage conversion circuit 2e converts a voltage input from the power supply 5 into a drive voltage for the glow plug 8, and heats and drives the glow plug based on a command signal from the CPU 2c. That is, the voltage conversion circuit 2e
When the ON and LOW commands are input from the CPU 2c, the glow plug 8 is driven to be weakly heated, and
When N and HIGH commands are input, the glow plug 8 is driven to be strongly heated. On the other hand, the CPU 2c sends the OF
When the command of F is input, the heating drive of the glow plug 8 is stopped.

Next, the starting device 1 configured as described above.
Will be described with reference to the timing chart of FIG.

First, when the power switch 3 is turned on, the CP
The driving power is supplied from the power supply 5 to the U2c, the starter motor 6, and the receiver 9. Then push button switch 4
Is turned on and a start command is input to the CPU 2c.
ON and HIGH commands are input from U2c to the voltage conversion circuit 2e. As a result, the voltage conversion circuit 2e drives the glow plug 8 by strong heating (period in FIG. 3). That is, the glow plug 8 is placed in a red heat state (for example, 1000
C.) to activate the platinum element of the glow plug 8.

Thereafter, the CPU 2c inputs an OFF command to the voltage conversion circuit 2e when 0.5 to 1 second (period 1 in FIG. 3) has elapsed from the start of heating the glow plug 8. As a result, the voltage conversion circuit 2e
Is stopped (period in FIG. 3).

Thereafter, the CPU 2c operates the voltage conversion circuit 2e.
ON and HIGH commands are inputted. Thereby, the voltage conversion circuit 2e drives the glow plug 8 again by strong heating. At this time, at the same time, the motor control unit 2
ON command is input to the motor control unit 2d
Starts the start of the starter motor 6. After that, CPU
2c to the voltage conversion circuit 2e at a predetermined cycle
The H command and the LOW command are input alternately. As a result, the voltage conversion circuit 2e intermittently repeats the strong heating and the weak heating at a predetermined cycle while the cell motor 6 is rotating to drive the glow plug 8 to heat (periods 1 to 3 in FIG. 3). As a result, the glow plug 8 is maintained at a plug temperature (200 to 800 ° C.) at which an appropriate explosion starts.

When the push button switch 4 is turned off and the input of the start command to the CPU 2c is interrupted at the time when the engine starts a predetermined combustion, the CPU 2c issues an OFF command to the motor control unit 2d. You. Thereby, the motor control unit 2d stops the rotation drive of the cell motor 6.

Subsequently, when a predetermined time (for example, 2 to 3 sec: the period shown in FIG. 3) elapses after the input of the start command to the CPU 2c is interrupted, the CPU 2c issues an OFF command to the voltage conversion circuit 2e. Is entered. Thereby, the voltage conversion circuit 2e stops the heating drive of the glow plug 8.

As described above, in the starting device 1 of this embodiment, the starting power source of the cell motor 6, the heating power source of the glow plug 8 and the model steering power source of the receiver 8 are used as a common power source, and the total power consumption is kept low. To start the model glow engine.

The control unit 2 is operated by a single power supply 5. The start / stop control of the cell motor 6 and the power control at the time of heating the glow plug 8 are performed by a push button switch 4 or a remote control by radio. ing.

More specifically, since the element that determines the ignition timing of the glow engine is the temperature of the plug element of the glow plug 8, in the starting device 1 of the present embodiment, the ignition timing (element temperature) is required to realize good starting characteristics. Figure 3
The control is actively performed at the timing shown in FIG.

Therefore, conventionally, the glow plug at the time of starting the engine was completely in a red heat state, and thus consumed a large amount of electric power. By setting the temperature lower than before, power consumption during plug heating can be reduced.

Moreover, "lock phenomenon" and "knocking"
Is eliminated, so that the inrush current of the starting motor can be reduced. As a result, the total power consumption required at the time of starting can be reduced.

Further, since the glow plug 8 is strongly heated just before the starter motor is rotated, the fuel component remaining in the combustion chamber is burned off, and the occurrence of knocking can be prevented.

Further, power is supplied to the control unit 2 from a single power source 5, and power for heating the starting motor 6 and the glow plug 8 is supplied from the control unit 2. In addition, the control unit 2 also supplies power to the receiver 9 as a power source for controlling the remote steering mechanism.

Therefore, three types of power sources, which are indispensable in the past, such as a power source for starting (generally 12 V), a power source for glow plug heating (generally 1.2 V), and a power source for remote steering (6 V), can be used in common. A glow engine model can be constructed with easy starting and low-cost radio control.

By the way, in the starting device 1 of the present embodiment, after the glow plug 8 is strongly heated again to start the cell motor 6, the element (platinum wire) of the glow plug 8 is started.
There is little current to flow through and there is no glow. Therefore, the electric resistance is greatly affected by the state of the combustion chamber of the engine.
Therefore, by detecting a change in current at the time of weak heating, an excess or deficiency of fuel in the combustion chamber may be detected, and control of fuel supply at the time of starting or idling may be performed.

In addition, when the present invention is applied to a plug heating system for preventing engine stall during idling, the glow plug is conventionally heated strongly. However, when this embodiment is adopted, the plug temperature is set to the lowest temperature at which combustion starts. , It is only necessary to maintain low temperature. Therefore, the battery consumption is reduced as compared with the conventional case, and the running and operating time of the model can be extended.

[0035]

As apparent from the above description, according to the starting device for a model glow engine of the present invention, the power consumption during plug heating can be suppressed by setting the plug temperature lower than before. . In addition, the occurrence of the "lock phenomenon" or "knocking" is eliminated, and the inrush current of the starting motor can be reduced. As a result, the total power consumption required at the time of starting can be reduced. Also,
Since the strong heating is performed immediately before the starting motor is rotated, the fuel component remaining in the combustion chamber can be burned off to prevent knocking.

Power is supplied from a single power supply to the control device, and power for starting motor and glow plug heating is supplied from the control device. In addition, the controller also supplies power to the receiver as a power source for controlling the remote steering mechanism.

Therefore, the three types of power sources, the power source for starting, the power source for glow plug heating, and the power source for remote steering, which are indispensable in the past, can be used in common. Can be constructed.

[Brief description of the drawings]

FIG. 1 is a view showing the overall configuration of a starting device for a model glow engine according to the present invention, and FIG.

FIG. 2 is a circuit block diagram of a control unit which is a main part of the starting device of FIG.

FIG. 3 is a drive timing chart of a glow plug and a cell motor by the starting device of FIG. 1;

FIG. 4 is a diagram showing a conventional configuration for starting a glow engine.

FIG. 5 is a diagram showing another conventional configuration for starting a glow engine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Starting device, 2 ... Control unit (control device), 3 ... Power switch, 4 ... Push button switch (input means), 5 ... Power supply, 6 ... Cell motor (Starting motor), 8 ... Glow plug, 9 ... Reception Machine.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) F02N 11/08 F02N 11/08 U (72) Inventor Moto Nakajima 3-6-15 Imagawa Seikiyoshi-ku, Higashisumiyoshi-ku, Osaka-shi, Osaka Co., Ltd. F term (reference) 2C150 CA08 CA09 CA10 EB54

Claims (1)

[Claims] 1. An input means for inputting a start command to start a glow engine having a start motor and a glow plug, and the glow plug is brought to a red heat state when a start command is input from the input means. After the heating, the heating of the glow plug is stopped, and after a lapse of a predetermined time after the heating of the glow plug is stopped, the glow plug is heated again and the start motor is started, and a start command from the input means is interrupted. The start of the starting motor is stopped when the starter is turned off, and the plug temperature of the glow plug is maintained at 200 to 800 ° C. until a predetermined time elapses after the start command from the input means is cut off. Starting the glow plug and then heating the glow plug so as to stop heating the glow plug On a control device for controlling a single power source connected to the control device, the power supply from said single power source to the control device,
A power switch that is turned off, and when the power switch is on, supplies power supplied from the single power source to a control device, the starting motor, the glow plug, and a receiver as desired power. A glow engine starting device for a model, characterized in that: