JPH06193473A - Governor for internal combustion engine - Google Patents

Abstract

PURPOSE:To control the rotational speed with a highest degree of accuracy by providing a mechanical and electronic governors for adjusting the flow rate of fuel fed into an internal combustion engine so as to control the rotational speed, and by providing a change-over device for operating either one of these governors. CONSTITUTION:In the case of controlling the rotational speed of a gasoline engine by an electronic type governor 28, an accelerator lever 17 is rotated beforehand in the direction A so as to set the urging force of a main spring 15 urging a governor shaft 9 or the like to zero. Further, a main switch 30 for a controller 25 is turned on, and a plunger 26 is pulled into an actuator 27. Then, a lever 31 is made into contact with a pin 32 on a throttle lever 2 urged in a closing direction by a coil spring 3 so as to turn the throttle lever 2 in an opening direction. Meanwhile, in the case of control by a mechanical type governor 24, the accelerator lever 17 is turned in the direction B so as to turn the throttle lever 2 in the opening direction through the intermediary of the governor lever 12 and a link 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed governor for an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, a speed control device for an internal combustion engine includes a moving member that moves according to the number of revolutions of the internal combustion engine, and a fuel supply amount adjusting section (for example, a throttle lever of a carburetor) that increases or decreases the fuel supply amount. A mechanical speed governor that controls the rotation speed of the internal combustion engine by increasing / decreasing the fuel supply amount by controlling the fuel supply amount adjusting unit via the moving member. Widely adopted.

Further, as a speed governing device for mounting on a passenger vehicle, which requires a highly accurate rotation speed control, an injector is provided in each cylinder of an internal combustion engine, and the intake air amount, the rotation speed, etc. are basically based on the accelerator position of the driver. An electronic fuel injection device is used in which the basic injection amount of fuel is determined by the above, and the final fuel injection amount is obtained by multiplying by various correction factors, and the final fuel injection amount is injected from the injector. .

[0004]

In an internal combustion engine using an electronic fuel injection device as a speed control device, the rotational speed can be controlled with high precision and it is suitable for automating the operation of the internal combustion engine. Since the electronic fuel injection device is very expensive, it is rarely used in general internal combustion engines.

Further, since the electronic fuel injection device has a higher failure rate than the mechanical speed governor, it is difficult to employ it in a fire engine or the like which is required to be operable in any case. is there.

[0006]

The invention according to claim 1 is
A mechanical speed governor for controlling the rotational speed of the internal combustion engine is provided by controlling the fuel supply amount adjusting unit for increasing / decreasing the fuel supply amount according to the rotational speed of the internal combustion engine, and with the operation of the internal combustion engine. The electronic speed governor is provided for controlling the rotational speed of the internal combustion engine by controlling the fuel supply amount control unit based on the comparison result between the detected value and the set value for at least one variable that changes, A switching unit for operating either one of the electronic speed governor and the electronic speed governor is provided.

According to a second aspect of the present invention, in the first aspect of the present invention, a moving member that moves according to the rotational speed of the internal combustion engine and a link whose one end is connected to the fuel supply amount adjusting section are provided, and a mechanical type is provided. When the speed governor operates, the moving member and the link move integrally, and when the electronic speed governor operates, the link moves in a free state with respect to the moving member. Linked with the link.

[0008]

According to the first aspect of the present invention, the mechanical speed governor and the electronic speed governor are selectively operated by switching the switching unit, and the electronic speed governor controls the rotation speed with high accuracy. And a reliable speed control by a mechanical speed governor.

According to the second aspect of the present invention, during the operation of the mechanical speed governor, the rotational speed can be controlled by controlling the fuel supply amount adjusting section via the moving member and the link.
Since the link is free from the moving member when the electronic speed governor operates, the rotation speed can be controlled by controlling the fuel supply amount adjusting unit without being affected by the mechanical speed governor.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. A gasoline engine, which is an internal combustion engine, is provided with a carburetor 1, and a throttle valve (not shown) is provided in the carburetor 1. The throttle valve is connected to a throttle lever 2 which is a fuel supply amount adjusting unit for increasing / decreasing the fuel supply amount by adjusting the opening of the throttle valve. The throttle lever 2 has a direction for decreasing the fuel supply amount. A coil spring 3 is attached to urge (in the direction of "closed" arrow).

Next, there is provided a rotary shaft 4 which rotates at a rotational speed proportional to the rotational speed of the gasoline engine. A support plate 5 is fixed to the rotary shaft 4 and the rotary shaft is attached to the support plate 5. A flyweight 6 which is rotated by a centrifugal force accompanying the rotation of 4 is rotatably attached with a pin 7 as a fulcrum. Further, a slider 8 is mounted on the rotary shaft 4 so as to slide by being pushed by the flyweight 6. Further, a governor shaft 9 rotatably supported around an axis is provided, and the governor shaft 9 includes a governor arm 10, a spring arm 11, and a moving member extending in a direction orthogonal to the axis direction. The governor lever 12 is fixed.

Here, a prismatic follower 13 is rotatably attached to the tip of the governor arm 10 by a pin 14, and the follower 13 is disposed with its side surface facing one side surface of the slider 8. . The main spring 15 is attached to the tip of the spring arm 11.
, One end of the wire 16 is connected to the other end of the main spring 15, and the other end of the wire 16 operates either a mechanical speed governor or an electronic speed governor described later. Accelerator lever 1 which is a switching unit for
7, the accelerator lever 17 is connected to one end of the mounting member 1
It is attached to 8 by a pin 19 so as to be rotatable. The biasing force of the main spring 15 is set to be much larger than the biasing force of the coil spring 3. In addition, a connecting hole 2 is provided at the tip of the governor lever 12.
0 is formed, one end side of a link 21 is slidably inserted into the connecting hole 20, and the other end of the link 21 is rotatably connected to a connecting hole 22 formed in the throttle lever 2. There is. A bent portion 23 is formed at the tip of the link 21 on one end side, and
It has a structure that does not fall out.

Then, the rotary shaft 4, slider 8, governor shaft 9, main spring 15, governor lever 1
2, a mechanical speed governor 24 for controlling the rotational speed of the gasoline engine is formed by the link 21 and the like. Regarding the length dimension of the link 21, as shown in FIG. 1, when no external force acts on the governor shaft 9 of the mechanical speed governor 24, the throttle lever 2 Can be rotated to the end in the arrow “closed” direction, and at this time, the bent portion 23 is set to be in contact with the peripheral portion of the connecting hole 20.

Next, a rotation speed detection unit (not shown) that detects the rotation speed of the gasoline engine, which is one variable that changes with the operation of the gasoline engine, and a rotation speed setting unit that sets the rotation speed of the gasoline engine. (Not shown), a controller 25 that outputs a control signal based on the detection signal from the rotation speed detection unit and the setting signal from the rotation speed setting unit, the controller 25
An electronic speed governor 28 formed by an actuator 27 or the like having a plunger 26 that appears and disappears based on a control signal output from the device is provided. A switch 30 is provided between the controller 25 and the power source 29 to operate either the mechanical speed governor 24 or the electronic speed governor 28. .

A lever 31 is fixed to the tip of the plunger 26, and the throttle lever 2
A pin 32 with which the lever 31 is abutted is fixed to the tip of the pin. The actuator 27 is energized to move the plunger 26 to the actuator 2
7 has a structure to be pulled into the inside of the plunger 26.
In which the lever 31 comes into contact with the pin 32 to increase the fuel injection amount of the throttle lever 2 when is drawn into the actuator 27 (arrow "open" direction)
Rotate to. The amount of movement of the plunger 26 changes according to a control signal (amount of electricity) from the controller 25. In addition, a compression spring (not shown) for urging the plunger 26 in the protruding direction is provided inside the actuator 27.
When the actuator 27 is de-energized, the plunger 26 moves to the maximum protruding position.

In such a structure, first, the rotational speed control of the gasoline engine by the electronic speed governor 28 will be described. When the rotational speed is controlled by the electronic speed governor 28, the accelerator lever 17 is rotated in the direction of arrow A as shown in FIG. 2, and the biasing force of the main spring 15 acting on the governor shaft 9 or the like is applied. Is set to “0”. Therefore, before starting the gasoline engine, the throttle lever 2 is rotated to the end portion in the direction (arrow "closed direction") in which the fuel supply amount is reduced by the biasing force of the coil spring 3. Further, the plunger 26 of the actuator 27 is moved to the most protruding position by the biasing force of the built-in compression spring. The state before starting the gasoline engine when the rotational speed control is performed by the electronic speed governor 28 is the state shown in FIG.

From this state, when the switch 30 of the controller 25 is turned "on" and the gasoline engine is started, the plunger 26 is pulled into the actuator 27 by a preset control signal, and the amount of protrusion is small. Become. At this time, the lever 31 comes into contact with the pin 32 fixed to the throttle lever 2 which is urged in the arrow “closed” direction by the urging force of the coil spring 3, and the plunger 26 is drawn into the actuator 27. By moving to, the throttle lever 2 rotates in the arrow "open" direction which increases the fuel supply amount.

When the number of revolutions increases after the start of the gasoline engine, the number of revolutions of the rotary shaft 4 also rises accordingly, and the centrifugal force acting on the flyweight 6 rises as the number of revolutions of the rotary shaft 4 rises, and the slider 8 also rises. Slides toward the governor arm 10. When the side surface of the slider 8 comes into contact with the side surface of the follower 13, the biasing force of the slider 8 is transmitted to the governor lever 12 via the governor arm 10 and the governor shaft 9, and the tip end of the governor lever 12 is centered on the governor shaft 9. It rotates in the direction of arrow C shown in FIG. However, since the link 21 is slidably inserted into the connection hole 20 formed at the tip of the governor lever 12, the link 21 is not affected by any effect and only the governor lever 12 rotates.

On the other hand, in the electronic speed governor 28, the plunger 26 appears and disappears based on the result of comparison between the detected rotational speed and the set rotational speed, and the movement of the plunger 26 is transmitted via the lever 31 and the pin 32. This is transmitted to the throttle lever 2 and the throttle lever 2 rotates. Then, the fuel supply amount is increased / decreased with the rotation of the throttle lever 2, and the rotation speed control for maintaining the rotation speed of the gasoline engine at the set rotation speed is performed.

When the operation of the gasoline engine is stopped, the power supply to the actuator 27 is cut off by turning off the switch 30. Then, the plunger 26 is moved to the maximum protruding position by the biasing force of the compression spring built in the actuator 27, and the throttle lever 2 is rotated by the biasing force of the coil spring 3 to the maximum turning position in the arrow "closed" direction. Fuel supply is minimal. Then, the operation of the gasoline engine is stopped by cutting off the power supply to the spark plug (not shown).

Next, the control of the rotational speed of the gasoline engine by the mechanical speed governor 24 will be described. When the rotational speed control is performed by the mechanical speed governor 24, the accelerator lever 17 is rotated and fixed in the direction of arrow B shown in FIG. 2, and the switch 30 is turned off. Here, by rotating the accelerator lever 17 in the direction of arrow B, the biasing force of the main spring 15 causes the governor lever 1 to move via the spring arm 11 and the governor shaft 9.
2, the tip of the governor lever 12 rotates about the governor shaft 9 in the direction of arrow D shown in FIG. The link 21 moves in the direction of arrow D as the peripheral edge of the connecting hole 20 contacts the bent portion 23 of the link 21, and the throttle lever 2 increases the fuel supply amount in accordance with the movement of the link 21 ( Rotate in the "open" direction). Since the force in the arrow C direction due to the urging force of the coil spring 3 is constantly applied to the link 21, the link 21 is bent when the governor lever 12 is rotated in the arrow D direction from the position shown in FIG. The portion 23 is kept in contact with the peripheral portion of the connecting hole 20.

When the number of revolutions increases after the start of the gasoline engine, the number of revolutions of the rotating shaft 4 also rises accordingly, and the centrifugal force acting on the flyweight 6 rises as the number of revolutions of the rotating shaft 4 rises, and the slider 8 also rises. Slides in the direction of the governor arm 10. The side surface of the slider 8 is the follower 1
When abutting against the side surface of No. 3, the force from the slider 8 acts in the direction opposite to the urging force of the main spring 15, that is, the tip end portion of the governor lever 12 rotates in the direction of arrow C about the governor shaft 9. To do. Therefore, the governor lever 12 is rotated to a position where the biasing force of the slider 8 and the biasing force of the coil spring 3 and the biasing force of the main spring 15 are balanced, and the throttle lever 2 is rotated to a position where the biasing forces are balanced. The fuel injection amount is controlled, and the rotational speed of the gasoline engine is controlled.

Next, a case will be described in which the operator mistakenly rotates the accelerator lever 17 in the direction of arrow B while the electronic speed governor 28 is controlling the number of revolutions.
When the rotational speed control is being performed by the electronic speed governor 28, the link 21 and the governor lever 12 do not operate integrally, and one end of the link 21 slides with respect to the connecting hole 20 of the governor lever 12. is doing. When the accelerator lever 17 rotates in the direction of arrow B from such a state, the tip end portion of the governor lever 12 rotates in the direction of arrow D by the urging force of the main spring 15, and the peripheral edge portion of the coupling hole 20 links 2.
It contacts the bent portion 23 of No. 1. Then, when the link 21 is pulled in the direction of arrow D, the throttle lever 2 rotates in the direction of "open" arrow, the fuel supply amount increases, and the rotational speed of the gasoline engine rises. Then, the rotation speed detected by the rotation speed detection unit rises above the set rotation speed, so that the electronic speed governor 28 slides the plunger 26 in the direction in which the protrusion amount increases.

Incidentally, after the accelerator lever 17 is erroneously operated from the state where the rotational speed is controlled by the electronic speed governor 28 as described above, the state where the rotational speed is controlled by the electronic speed governor 28 is restored. Indicates a range in which the bent portion 23 of the link 21 does not come into contact with the peripheral portion of the coupling hole 20, that is, the number of revolutions controlled by the mechanical speed governor 24 or higher. Instead of the rotation speed control by 28, the rotation speed control by the mechanical speed governor 24 is performed.

Therefore, if the electronic speed governor 28 fails while the rotational speed is controlled by the electronic speed governor 28, the mechanical speed governor is switched by switching the accelerator lever 17. The number of revolutions can be controlled by 24.

The electronic speed governor 2 in this embodiment is used.
Regarding the rotation speed control by 8, the rotation speed of the gasoline engine has been described as an example of the variable that changes with the operation of the gasoline engine, but in the fire engine, the water discharge pressure or the water discharge amount may be used as the variable.

[0027]

As described above, according to the first aspect of the present invention, the rotational speed of the internal combustion engine is controlled by controlling the fuel supply amount adjusting unit for increasing or decreasing the fuel supply amount according to the rotational speed of the internal combustion engine. A mechanical speed governor is provided, and the internal combustion engine is controlled by controlling the fuel supply amount control unit based on the comparison result between the detected value and the set value for at least one variable that changes with the operation of the internal combustion engine. Since the electronic speed governor for controlling the rotational speed of the engine is provided, and the switching unit for operating one of the mechanical speed governor and the electronic speed governor is provided, the internal speed is controlled by the electronic speed governor. When the engine speed control is performed, highly accurate control can be performed, and when the present invention is applied to a fire engine, the engine speed control can be performed based on the water discharge amount and the water discharge pressure. With Can be performed septum control, also,
If the electronic speed governor fails during the operation of the internal combustion engine, the operation of the internal combustion engine can be continued by switching to the rotation speed control by the mechanical speed governor. Since an electronic speed governor is additionally provided to the internal combustion engine equipped with the device, a significant cost reduction can be achieved compared to the case where the rotational speed control is performed using the electronic fuel injection device, etc. Have the effect of.

According to the second aspect of the invention, as described above, in the first aspect of the invention, the moving member that moves according to the rotation speed of the internal combustion engine and the link having one end connected to the fuel supply amount adjusting section are provided. The moving member and the link move integrally when the mechanical speed governor operates, and the link moves in a free state with respect to the moving member when the electronic speed governor operates. Since the moving member and the link are connected, the rotation speed can be controlled by controlling the fuel supply amount adjusting unit via the moving member and the link when the mechanical speed governor operates, and the electronic speed governor can be controlled. Since the link is free from the moving member when the system is activated, the rotation speed can be controlled by controlling the fuel supply amount control unit without being affected by the mechanical speed governor. To.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view.

FIG. 3 is a perspective view showing a connected state of a governor lever and a throttle lever.

[Explanation of symbols]

 2 Fuel Supply Amount Adjusting Part 12 Moving Member 17, 30 Switching Part 21 Link 24 Mechanical Speed Control Device 28 Electronic Speed Control Device

Claims (2)

[Claims] 1. A mechanical speed governor for controlling the rotational speed of an internal combustion engine by controlling a fuel supply amount adjusting section for increasing / decreasing the fuel supply amount according to the rotational speed of the internal combustion engine, and the internal combustion engine. The electronic speed governor for controlling the rotational speed of the internal combustion engine by controlling the fuel supply amount control unit based on the comparison result between the detected value and the set value for at least one variable that changes with the operation of the internal combustion engine. And a switching unit for operating either one of the mechanical speed governor and the electronic speed governor. 2. A moving member that moves according to the number of revolutions of the internal combustion engine and a link whose one end is connected to the fuel supply amount adjusting section are provided, and the moving member and the link are connected when the mechanical speed governor operates. 2. The moving member and the link are connected so as to move integrally and to move the link in a free state with respect to the moving member when the electronic speed governor operates. Internal combustion engine speed governor.