JPH0130593Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stop control device for an engine-driven generator, and in particular, after the ignition plug circuit of a gasoline engine is opened, the valve opening of the carburetor inlet is reduced for a predetermined period of time, and the engine This relates to a stop control device for an engine-driven generator that reduces the amount of fuel intake due to inertia.

In recent years, from the standpoint of preventing noise pollution and saving energy, a system has been proposed in which each component of an engine-driven generator is housed in a soundproof case, and the engine speed is reduced by an automatic slowing device when there is no load. ing. Along with this, conventional engine-driven generators of this type are designed to prevent the temperature rise of the generator, fuel tank, battery, etc., which are housed in a soundproof case, compared to open types that are not housed in a soundproof case. A large amount of cooling air is required, and due to the configuration of the generator, the engine cooling air is discharged by a fan after cooling the cylinder head, which is a so-called reverse engine, so in order to increase cooling efficiency, even more Requires a large engine fan. This results in an increase in the moment of inertia, and in the case of a device that combines equipment with few sliding parts, such as an engine generator, it is necessary to disconnect the engine spark plug circuit and perform a stop operation when the generator is not loaded. However, since the load is slight, the rotation does not stop immediately.

On the other hand, in the automatic slowing device of a normal small generator, the speed control device is always urged to the high speed side using a return spring, etc., and when there is no load, the solenoid is energized by an appropriate detection means and forced. Many types of speed control devices are used in which the speed control device is switched to the low speed side, and conventional solenoid drive circuits simultaneously open the engine spark plug circuit in order to prevent unnecessary consumption of battery as a power source. The solenoid is configured to be deenergized. Therefore, when the spark plug circuit is disconnected to stop the engine, the solenoid is deenergized and the speed control device is switched to the high speed side by the return spring. In other words, while the valve opening of the intake port of the engine carburetor remains increased,
As mentioned above, the engine continues to rotate due to the moment of inertia and then stops, so even though a large amount of fuel is sucked into the cylinder, it is not ignited, so a mixture with a concentration far exceeding the ignition concentration accumulates. As a result, there were problems such as making it difficult to restart the engine.

The present invention was developed in view of the above circumstances, and is an engine-driven generator equipped with a solenoid device that constantly biases the speed control device toward the high speed side and maintains the speed control device at the low speed side against this biasing force when there is no load. In this invention, the speed control device is configured to be held at a low speed rotation maintaining side by a low speed holding member made of a shape memory alloy for a predetermined period of time after the engine spark plug electric circuit is opened, regardless of the solenoid. The object of the present invention is to provide a stop control device for an engine-driven generator.

According to this invention having the above configuration, the engine continues to rotate due to inertia even after the engine spark plug circuit is disconnected, but at the same time as the spark plug circuit is disconnected, the low speed holding member made of a shape memory alloy is activated.
Since the speed control device is held at the low speed rotation holding side for a predetermined period of time, it is possible to obtain a stop control device for an engine-driven generator that stops without increasing the amount of fuel intake and has very good restartability. .

Embodiments of the present invention will be described below based on the drawings.
The drawings relate to the present invention; FIG. 1 is a sectional view of a soundproof case, and FIG. 2 is a perspective view of a stop control device.

A generator 3 directly connected to an engine 2 is housed inside a soundproof case 1. The engine 2 is a normal gasoline engine, and in the figure, 2a is a spark plug, 2b is a cylinder head, 2c is a cold air fan,
4a is a governor adjustment pin, and a speed control device 4 is installed on the governor adjustment pin 4a. An operating pin 4b is attached to the upper end engagement portion of the speed control device 4 so as to fit into a locking hole 5a of the operating plate 5. A return spring 6 for maintaining high-speed rotation is attached to the high-speed side of the actuating plate 5 by temporarily engaging the fixed body 1a of the soundproof case 1, and a return spring 6 for temporarily controlling the rotational speed is attached to the low-speed side of the actuating plate 5. A low speed holding member 7 made of a shape memory alloy for low speed control is attached to the fixed body 2d of the engine 2 with one end engaged therewith. Reference numeral 8 in the drawings denotes a solenoid device that holds the speed control device 4 toward the low speed side against the return spring 6 when the engine is under no load.

The low-speed holding member 7 is formed into a coil shape of a shape memory alloy that is formed at a constant temperature and returns to its original shape when the original temperature is returned even if the shape is deformed due to a temperature difference, as shown in FIG. As shown, the ignition plug 2a
The switch 13 of the electric line 12 connecting the lighting coil 11 and the low-speed holding member 7 is closed in conjunction with the opening and closing of the ignition switch 10 attached to the electric line 9. Reference numeral 14 in the drawings represents an ignition coil. Incidentally, the lighting coil 11 and the ignition coil 14 are members that generate voltage by the rotation of a flywheel magnet, as is well known. As a result, when the ignition switch 10 of the spark plug 2a is turned off, the engine stops normal rotation, and when the switch 13 is turned on, the low speed holding member 7 is energized by the voltage generated in the lighting coil 11, and current flows. The low speed holding member 7 contracts and temporarily pulls down the speed control device 4 to the low speed side, so that the governor is held in the same way as when rotating at a low speed in an engine that rotates at a high speed due to inertia. In other words, the low-speed holding member 7 is always tensioned by the return spring 6 on the high-speed side, but current flows due to the voltage applied from the lighting coil 11, and it is heated by the Joule heat, changing its shape so that it contracts more than its current state. Memories are made. This contracted shape expands again as it cools down and is pulled toward the high speed side by the return spring 6. At that point, the engine has completely stopped and of course no electricity is being generated, so the lighting coil 11
Since there is no voltage present in , the low speed holding member 7 will not operate.

According to this invention having the above configuration, when the ignition switch is turned off, normal rotation of the engine 2 is stopped and the engine 2 continues to rotate due to inertia. The opening degree does not change much, so a large amount of fuel is drawn into the cylinder, but in the present invention, the voltage of the lighting coil 11 is applied to the low speed holding member 7 at the same time as the ignition switch 10 is turned off, and a current flows. The low speed holding member 7 contracts and pulls the speed control device 4 toward the low speed side, and as a result, the governor adjustment pin 4a rotates, reducing the valve opening of the carburetor inlet. Therefore, even if the engine cylinder rotates at high speed due to engine inertia, the amount of fuel intake is the same as when rotating at low speed.
This has the effect of allowing a smooth start even when the engine is started again after it has been stopped. After the engine's ignition switch is turned off, the generator generates electricity due to the rotation due to the inertia of the engine, and the residual voltage is supplied from the lighting coil 11 to the low speed holding member 7, which pulls the speed control device 4 toward the low speed side. Even after the engine has stopped, there is still a delay time until the low speed holding member cools down, and when the cooling is completed, the speed control device 4 is pulled to the high speed side by the return spring 6, and the next engine start is performed using a controlled gas concentration. This has the effect of allowing you to start the engine.

[Brief explanation of the drawing]

The drawings relate to the present invention; FIG. 1 is a front view, FIG. 2 is a perspective view of the speed control device, and FIG. 3 is an electrical circuit diagram showing the relationship between the ignition switch and the low speed holding member. 1...Soundproof case, 1a...Fixed body, 2...Engine, 2a...Spark plug, 2b...Cylinder head, 2c...Cold air fan, 2d...Fixed body, 3...
... Generator, 4 ... Speed control device, 4a ... Governor adjustment pin, 4b ... Actuation pin, 5 ... Actuation plate, 5
a...Lock hole, 6...Return spring, 7...
...Low speed holding member, 8... Solenoid device, 9...
Electrical line, 10... Ignition switch, 11... Lighting coil, 12... Electrical line, 13... Switch, 14...
ignition coil.

Claims (1)

[Scope of utility model registration request] In an engine-driven generator equipped with a solenoid device that always biases the speed control device toward the high speed side and maintains the speed control device at the low speed side against this biasing force when there is no load, a predetermined period of time after the engine spark plug electrical circuit is opened. The speed control device is held at a low speed side by a low speed holding member made of a shape memory alloy regardless of the solenoid, and the valve opening of the carburetor intake port is reduced to reduce the amount of fuel sucked due to engine inertia. A stop control device for engine-driven generators.