JPH055435A - Generation control device for engine-driven generator - Google Patents

Abstract

PURPOSE:To stop control of a throttle valve by an electronic control unit when a bystarter is actuated for cold-starting an internal combustion engine and to automatically control an opening of the throttle valve in accordance with a load of a generator when the bystarter is stopped after completion of warming up. CONSTITUTION:An output signal of a generator 31, driven by an internal combustion engine 30, is received to an electronic control unit 37, and its output part is connected to a driving circuit 38. A switch 23 is insertion-connected between the driving circuit 38 and an electrifying part of an actuator 17 connected to a throttle valve 13 of a carburetor 1. At the time of cold-starting the internal combustion engine 30, when a bystarter 22 is actuated correlatively to a peripheral temperature, a signal fed to the actuator 17 via the driving circuit 38 from the electronic control unit 37 is interrupted by opening the switch 23 to hold the throttle valve 13 to an idle position. When warming up is completed, the bystarter 22 is stopped to close the switch 23, and an opening of the throttle valve 13 is controlled in accordance with a load of the generator 31 by the electronic control unit 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator control device for an engine-driven generator that electrically controls a throttle valve of a carburetor in an internal combustion engine that drives a generator based on an output signal of the generator. ..

[0002]

2. Description of the Related Art A carburetor for an internal combustion engine that drives a portable power generator or the like is disclosed in, for example, Japanese Patent Application Laid-Open No.
It is desirable to have a by-starter such as that disclosed in 64-32054. A carburetor equipped with a by-starter has the advantages of easier operation and better cold startability of the engine than a carburetor equipped with a chiyoke valve.However, an electronic control unit based on the output of the generator is used to restrict the carburetor. When a carburetor equipped with a by-starter is attached to a generator driving engine that controls a valve, the following problems occur.

Since the by-starter supplies a rich air-fuel mixture to the engine in order to assist the cold start of the engine, it is better to supply the rich air-fuel mixture while the engine is still cold immediately after the engine is started. Stabilize the rotation of. As the engine warms up, the air-fuel mixture becomes richer in proportion to the amount of air corresponding to the opening area of the air inlet of the by-starter, and the engine speed increases. There is no problem if the air-fuel mixture amount at this time matches the output characteristics of the generator shown in FIG.

However, when the engine speed increases as the engine warms up, the actuator works in the direction of closing the throttle valve, making the engine unstable. When the rotation of the engine becomes unstable, the output voltage fluctuates, the actuator works in the opposite direction, and this repeated operation causes the throttle valve to hunt.
Once hunting occurs, the rotation of the engine becomes more unstable, and especially when the throttle valve is opened, the negative pressure acting on the by-starter becomes weak, the effect of the by-starter is diminished, and warm-up takes time.

Further, when the actuator repeatedly applies a driving force to the throttle valve in the closing direction, the throttle valve cannot rotate below the idle position, so that the actuator and the link mechanism may be damaged by an excessive force.

After the warm-up is completed, the engine normally rotates up to the medium / high speed operation range even if the bi-starter is operated, so that it is easy for the driver to forget to release or stop the bi-starter. Causes an increase in fuel consumption, deterioration of fuel consumption, deposition of carbon on cylinders and spark plugs, and deterioration of exhaust gas.

As shown in FIG. 5, the output current (supply current) of the generator is almost proportional to the engine speed. The output of the engine is adjusted by the opening of the throttle valve of the carburetor.If the opening of the throttle valve is too small, the output current will be low and the output voltage will be low. Conversely, if the opening of the throttle valve is too large, the output current will be low. Output voltage becomes high. Therefore, it is desirable that the opening degree of the throttle valve of the carburetor is appropriately maintained and the predetermined voltage, current and frequency are maintained so that the engine drives the generator with an output commensurate with the load current.

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As described above, if the carburetor of the generator driving engine is simply provided with the by-starter, the rotation of the engine becomes unstable due to the hunting of the throttle valve after the engine is started, Unreasonableness occurs in the drive mechanism of the throttle valve,
It takes a long time to warm up, and if the by-starter is not stopped after the warming up is completed, the amount of fuel to the engine becomes excessive, resulting in a decrease in fuel consumption and deterioration of exhaust gas.

In view of the above problems, an object of the present invention is to stop the control of the throttle valve by the electronic control unit when the by-starter is operated for cold starting of the engine, and stop the by-starter after completion of warming up. It is an object of the present invention to provide a power generation control device for an engine-driven power generator that automatically controls the throttle valve according to the load of the power generator.

[0010]

In order to achieve the above object, the structure of the present invention is an internal combustion engine which drives a generator by an electronic control unit based on the output signal of the generator so as to obtain the rated power of the generator. In the power generation control device of the engine-driven generator that controls the opening of the throttle valve of the carburetor, the circuit for connecting the drive circuit controlled by the electronic control device and the actuator that drives the throttle valve to the engine start-up A switch that inserts a switch that opens the circuit in conjunction with the bi-starter when the starter operates is inserted and connected.

[0011]

When the engine is cold-started, the by-starter operates in relation to the ambient temperature and supplies a rich air-fuel mixture to a portion of the intake passage of the carburetor downstream of the throttle valve. At this time, since the switch is opened in relation to the operation of the control valve of the by-starter, the actuator controlled by the electronic control unit is not driven,
The throttle valve connected to the actuator is urged to the idle position by the force of the return spring. Therefore, the engine is smoothly started by the operation of the bystarter.

When the ambient temperature rises with the completion of warming up,
Since the operation of the by-starter is stopped and the switch is closed at the same time, the control signal of the electronic control unit is thereafter applied to the actuator via the switch, and the opening degree of the throttle valve is controlled according to the load fluctuation of the generator.

[0013]

2 is a side sectional view of a carburetor equipped with a by-starter used in a power generation control device of the present invention, and FIG. 3 is a plan sectional view of the carburetor. A float chamber body 11 is connected to the bottom of the carburetor 1 having an intake passage 12, and a partition 8 is provided inside the float chamber body 11 by a partition wall 8 and a starting fuel storage chamber 10
Is partitioned. The float chamber 5 is communicated with the upstream side of the intake passage 12 by the air vent 2. A well-known float 9 is supported by a guide tube 6 protruding from the vaporizer 1 into the float chamber 5.
The up and down movement of the float 9 is transmitted to the on-off valve via a lever (not shown) to keep the liquid level of the fuel supplied from the fuel tank to the float chamber 5 substantially constant. The main fuel nozzle 3 having the jet 4 is fitted and supported in the guide cylinder 6, and the upper end portion is projected to the bench lily portion of the intake passage 12. An air passage 20 that communicates the empty space of the float chamber 5 with the empty space of the starting fuel storage chamber 10 is provided above the partition wall 8, and the floating chamber 5 and the starting fuel storage chamber 1 are provided at the bottom of the partition wall 8.
Fuel passages 21 that communicate with each other are provided.

A throttle valve 13 facing the downstream side of the intake passage 12.
Are supported on the carburetor 1 by the valve shaft 14. As shown in FIG. 3, the valve lever 15 connected to the upper end of the valve shaft 14 is connected to an actuator 17 such as an electromagnetic actuator or a motor actuator as a driving means by a link mechanism represented by a rod 16.

As shown in FIG. 2, when the engine is cold-started, the fuel in the starting fuel storage chamber 10 is mixed with air by the by-starter 22 and supplied to the portion of the intake passage 12 downstream of the throttle valve 13. It The by-starter 22 is a cylindrical valve box 42.
And a control valve 51 integrally provided with a needle valve 54. The valve box 42 includes a spring chamber 43, a valve chamber 45, and a mixing chamber 49. An air inlet 52 is provided on one side of the valve box 42 so as to cross the valve chamber 45, and an air-fuel mixture outlet 46 is provided on the other side thereof.
The air-fuel mixture outlet 46 communicates with the intake passage 12 via a pipe 47. The mixing chamber 49 communicates with the outlet 18 of the starting fuel storage chamber 10 via a pipe 19.

The heat responsive body 41 is supported on the upper end wall of the valve box 42, and the switch 23 is supported on the side wall. The control valve 51 slidably fitted into the valve chamber 45 has its upper end flange urged against the rod 41a of the thermal actuator 41 by the force of the spring 44. As shown, from the upper end of the control valve 51 to the valve box 42
In the state where the protruding piece 51a protruding to the outside through the slit 50 is separated from the contact piece of the switch 23, the switch 2
Reference numeral 3 closes a circuit described later. However, when the protrusion 51a of the control valve 51 hits the contact piece of the switch 23, the switch 2
3 opens the circuit. At the position where the control valve 51 abuts on the valve seat 53 formed at the step between the valve chamber 45 and the mixing chamber 49,
The mixing chamber 49 is closed, the air inlet 52 and the mixture outlet 46.
Is also closed.

The thermal actuator 41 comprises a wax container fixed to the upper wall of the valve box 42 and a movable rod 41a. At high temperature, the wax expands and the rod 41a projects downward.
The control valve 51 is pressed against the valve seat 53 as shown. At a low temperature, the wax contracts and the rod 41a is pulled upward, so that the protrusion 51a of the control valve 51 comes into contact with the switch 23 to open the circuit under the force of the spring 44. At this time, the control valve 51
Is separated from the valve seat 53, and the mixing chamber 49 communicates with the air inlet 52 and the mixture outlet 46.

When cranking to start the engine, the negative pressure in the intake passage 12 causes the fuel in the starting fuel storage chamber 10 to be sucked into the mixing chamber 49 through the pipe 19 and the fuel inlet 48.
At the same time, it is mixed with the air sucked from the air inlet 52.
The air-fuel mixture passes from the air-fuel mixture outlet 46 through the pipe 47 to the intake passage 12
Is sucked into. In this way, the rich air-fuel mixture is supplied to the engine, so that the engine starts smoothly.

As shown in FIG. 1, in the internal combustion engine 30 which drives the generator 31, the opening degree of the throttle valve 13 is controlled by an electronic control unit 37 based on the output of the generator 31. That is, the output voltage from the generator 31 is shaped into a rectangular wave by the waveform shaper 36, and is input as a digital signal to the electronic control unit 37 including a microcomputer. The electronic control unit 37 calculates the deviation from the set frequency of the frequency setting circuit provided in the electronic control unit 37 based on the signal from the waveform shaper 36, the frequency change rate, etc., and sends it to the drive circuit 38 based on the calculation result. Send a signal. The drive circuit 38 produces a signal suitable for actuating the actuator 17 which drives the throttle valve 13. The drive circuit 38 is the switch 2 described above.
3 is connected to the energizing portion of the actuator 17.

As described above, when the by-starter 22 operates during cold start of the engine, the switch 23 is opened by the projecting piece 51a of the control valve 51, so that the actuator 17 is not driven and the throttle valve 13 is the return spring. It is urged to the idle position by force. Therefore, the operation of the by-starter 22 causes the engine to be started smoothly and warming up is achieved. When the ambient temperature rises as the engine warms up, the thermal actuator 4
The control valve 51 is pressed against the valve seat 53 by the rod 41a of No. 1. In this way, the operation of the by-starter 22 is automatically stopped, and at the same time, the switch 23 is closed. Thereafter, the signal of the drive circuit 38 controlled by the electronic control unit 37 is applied to the actuator 17 via the switch 23,
The throttle valve 13 is controlled according to the load fluctuation of the generator 31.

In the embodiment shown in FIG. 4, the output of the electronic control unit 37 is constantly applied to the actuator 17 via the drive circuit 38 so that the opening of the throttle valve 13 is controlled. Switch 2 to the circuit connecting 31 and the load
3 is inserted and connected, from the start of the engine to the completion of warm-up,
Since the switch 23 is opened by the by-starter 22,
The generator 31 is brought into a no-load state, so that the output of the electronic control unit 37 is lost and the throttle valve 13 is held at the idle position.

In the above embodiment, even if the control valve 51 is manually operated instead of using the thermal actuator 41 as the drive source of the by-starter 22, the cold start of the engine can be easily achieved and the warm start can be achieved. The throttle valve can be held in the idle position until the machine is completed.

[0023]

As described above, according to the present invention, the opening degree of the throttle valve of the carburetor of the internal combustion engine for driving the generator is controlled by the electronic control unit based on the output signal of the generator so as to obtain the rated power of the generator. In the power generation control device of the engine-driven generator to control,
Because a switch that connects the drive circuit controlled by the electronic control unit and the actuator that drives the throttle valve is inserted and connected to the switch that opens the circuit in conjunction with the by-starter when the engine-starting by-starter is operating. In the carburetor of the generator driving engine that controls the opening of the throttle valve based on the output of the generator, there is no problem even if a simple starter for cold start operation is provided, and with the operation of the starter, The abnormal operation of the throttle valve does not occur after the engine is started, and there is no fear that the drive mechanism of the throttle valve receives an excessive force and is damaged.

When the operation of the by-starter is stopped, the switch is closed, and thereafter the control signal of the electronic control unit is applied to the actuator via the switch, and the opening of the throttle valve is controlled according to the load fluctuation of the generator. ..

[Brief description of drawings]

FIG. 1 is a block diagram of a power generation control device for an engine-driven generator according to the present invention.

FIG. 2 is a side sectional view of a vaporizer provided with a by-starter.

FIG. 3 is a plan sectional view of the vaporizer.

FIG. 4 is a block diagram of a power generation control device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing an output characteristic of a generator.

[Explanation of symbols]

 1: Vaporizer 13: Throttle valve 17: Actuator 22: By-starter 23: Switch 30: Internal combustion engine 31: Generator 37: Electronic control device 38: Drive circuit

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[Procedure amendment]

[Submission date] June 11, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief explanation of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a block diagram of a power generation control device for an engine-driven generator according to the present invention.

FIG. 2 is a side sectional view of a vaporizer provided with a by-starter.

FIG. 3 is a plan sectional view of the vaporizer.

FIG. 4 is a block diagram of a power generation control device according to a second embodiment of the present invention.

FIG. 5 is a diagram showing an output characteristic of a generator.

[Explanation of Codes] 1: Vaporizer 13: Throttle valve 17: Actuator 2
2: By-starter 23: Switch 30: Internal combustion engine
31: Generator 37: Electronic control device 38: Drive circuit

Claims (1)

Claim: What is claimed is: 1. An electronic control unit based on an output signal of a generator controls an opening of a throttle valve of a carburetor of an internal combustion engine that drives the generator so as to obtain a rated power of the generator. In a power generation control device for an engine-driven generator, a circuit that links the drive circuit controlled by the electronic control device and the actuator that drives the throttle valve should be linked to the by-starter when the by-starter is operating to start the engine. A power generation control device for an engine-driven generator, wherein an open switch is inserted and connected. 2. A power generator of an engine-driven generator that controls an opening of a throttle valve of a carburetor of an internal combustion engine that drives a generator by an electronic control device based on an output signal of the generator so as to obtain a rated power of the generator. In the control device, a switch connecting the output terminal of the generator and the load has a switch for opening the circuit linked to the by-starter when the by-starter for starting the engine is inserted and connected. Generator control device.