JPS62284933A - Govering and driving device for carburetor - Google Patents

Abstract

PURPOSE:To automatically close a throttle valve when an electronic device failed and improve safety by connecting the output shaft of an actuator in an alignment to the valve shaft of a throttle valve via a slip mechanism and installing an interlocking mechanism having a special structure in an alignment on the other end side of said valve shaft. CONSTITUTION:An output shaft 41 and a valve shaft 5 are connected via a slip mechanism 6 in a device in which a throttle valve 2 is opened and closed by means of an electronically controlled actuator 4 via the shafts 41, 5. A carburetor link 12 is fixed to the valve shaft 5 while a sub-throttle drum 13 is rotatably provided on the valve shaft 5, and a striking part 131, an accelerator wire 14, etc. which are operated when the carburetor link 12 is opened are provided on the drum 13. On the other hand, an engaging member 121 is provided on the carburetor link 12 and can be engaged with the bar 16 of a secondary operating member lever 16 while being connected to an accelerator pump lever 21 via a rod 20. Also, a fixed actuator lever 61 of the slip mechanism 6 is connected to a carburetor member 25 provided on the valve shaft 5.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a speed-governing drive that controls engine rotation by controlling a carburetor in an internal combustion engine that has a speed-governing control function. It is related to the device.

[Conventional technology]

Conventionally, it is known that a method for controlling engine rotation is to adjust the opening degree of the throttle valve of the carburetor by operating a 7-cut unit using a controller.
As shown in the figure, this is a device that allows the throttle operation of the carburetor to be controlled electrically and remotely via an electronic controller and an actuator.The electronic controller has a speed regulating function, and these devices The actuator output shaft and the carburetor valve shaft are connected by a universal joint.

[Problem that the invention seeks to solve]

However, in such conventional control devices,
The throttle lever of the carburetor was placed on the valve shaft, and the valve shaft and the actuator output shaft were connected by a universal joint, and the structure was such that all throttle operations of the carburetor were controlled electronically, making it difficult to use a high-output actuator. In addition to complicating the layout of the control section, the valve stem of the carburetor cannot be electrically operated in the closing direction in the event of a failure in the electronic control system, making it impossible to operate the internal combustion engine and ensuring sufficient safety. There is a drawback that it is not possible to secure the
When speed governing control is performed by an actuator, a return spring always acts in the direction of closing the valve, and an actuator with a large output must be used to counter this return force, resulting in problems such as being uneconomical.

The present invention aims to eliminate these conventional drawbacks. Even if the electronic control system fails and the actuator stops, returning the throttle will close the throttle valve and prevent the internal combustion engine from overrunning, thereby increasing the safety of operation control. The purpose of the present invention is to provide a speed-governing drive device with high reliability, in which a small-sized and low-output holding actuator is sufficient, and operability is greatly improved.

Means for Solving Problem C] The present invention allows an electronic control unit to calculate the rotation of the internal combustion engine, the valve opening of the carburetor, and the signals from the valve opening detection switch, and In an electric speed regulating drive device that can be controlled by a connected actuator, there is provided a linkage mechanism that links a cab link with an auxiliary throttle drum that is connected to an accelerator and is provided on the valve shaft, and a fixation that is fixed to the output shaft of the actuator. A connecting mechanism that allows the actuator lever to be interlocked with a governor lever, a movable actuator lever that can rotate on the actuator output shaft, and a state in which the fixed actuator lever sandwiches a carburetor lever that is pivoted to the carburetor valve shaft with a main return coil spring. This is a speed regulating drive device for a carburetor, which is constructed of a structure in which the

〔Example〕

1 to 3 showing one embodiment of the present invention, the opening/closing operation of the throttle valve 2 of the carburetor 1 is controlled by an actuator 4 controlled by an electronic control unit (hereinafter referred to as EC1J) 3 on an output shaft 4. and the valve shaft 5, and the actuator output shaft 4. and the valve shaft 5 are connected by a slip mechanism 6, and the actuator output shaft 4.
An output signal is transmitted to the ECU 3 by a valve opening sensing switch 7 which is pressed and operated by an actuator lever 61 fixed to the valve opening sensor 8, and a potentiometer serving as a valve opening sensor 8 is linked to a governor lever 9. The output signal of the valve opening sensor 8 is transmitted to the ECU.
It is set to enter 3. That is, the depression angle is output as a voltage value to an A/D converter (not shown) in the ECU 3 in order to detect the input angle of the throttle. A rotation signal from an engine rotation sensor 10 is introduced into this ECU 3 to calculate a valve opening signal, and the output signal is used to control the engine stop circuit in addition to the drive circuit of the actuator 4.
1 is controlled.

The valve shaft 5 is provided with a carburetor link 12 and an auxiliary throttle drum 13.
The valve stem 5 is rotatable, and the cab link 12 is fixed to the valve stem 5. The auxiliary throttle drum 13 has an abutting portion 13 that acts when opening the cab link 12.
1, a wire 14 to the accelerator pedal 14+, and an auxiliary throttle return spring 15 in the direction of returning the accelerator. The cab link 12 is provided with a retaining piece 12°, and is connected to a lever 16 connected to a secondary actuation lever 17 that rotates on the valve shaft 5, and the secondary actuation lever 17 is connected to a lever 16 that is connected to a secondary actuation lever 17 that rotates the secondary valve 21 in the closing direction. Valve lever 1 to be actuated via the secondary actuation lever
°8 and return spring 19 are attached. The carburetor link 12 is connected to and interlocks with an acceleration pump lever 21 via a connecting rod 20, and an auxiliary spring 22. 23.24 are provided. The actuator 4 rotates forward and backward by a fixed angle in response to the output signal of the transistor of the ECU 3, and the output shaft 4 of the actuator 4 has an actuator knee lever 6 fixed thereto as a slip mechanism 6. And movable actuator lever 6! The carburetor lever 25 fixed to the end of the valve shaft 5 is biased by a coil spring 26 in the direction of clamping the carburetor lever 25. A return spring 27 is provided on the fixed actuator lever 61 to turn the valve opening degree sensing switch 7 ON-OFF.
The actuator 4 is positioned so that the limit position of the actuator 4 is regulated by the governor lever 9.

The governor lever 9 has a manual operation lever 91 and is provided with a manual operation member 28 and a return spring 29. In this case, the force of the return spring 29 is made greater than the force of the coil spring 26, and is centered so that the pulling direction of the manual operating member 28 is ON and the opposite direction is OFF. Further, a potentiometer 8 as a valve opening sensor is provided on the operating shaft 30 of the governor lever 9.

The ECU 3 inputs recognition of whether governor control is necessary or not using a P, T, O changeover switch 31, and an engine stop circuit 11 that receives signals from the ECU 3, such as an assumed abnormal state. It is set to receive and control the output of a warning light 32 that monitors the engine speed, and a relay drive output that is connected to the ignition coil 34 via a relay 33 and cuts off the ignition power supply in the event of overspeeding. The unit 3 is electrically connected to the valve opening detection switch 7, the valve opening sensor 8, and the engine rotation sensor 10.

In this case, the ECU 3 receives the rotation signal of the internal combustion engine, the signal of the valve opening of the carburetor 1, and the signal of the predetermined valve opening from the valve opening switch 7, and calculates the signal so that the actuator 4 rotates at the predetermined rotation. In normal operating conditions, in which the carburetor valve shaft 5 is rotated in the closing direction to perform speed control control and the cabana lever 9 is actuated, operation is performed manually via the wire 28 (the auxiliary throttle drum 13 is When the fully closed state B) reaches a predetermined rotation, the actuator 4 rotates the valve shaft 5 in the closing direction of the throttle valve 2. That is, as shown in Figures 4 to 6 A and B, the throttle section and the actuator section are shown in each state, but for example, when the engine is set while the engine is stopped, it becomes as shown in Figure 4. .

When the accelerator is fully closed and the governor lever 9 is in the OFF state, the coil spring 26 is biased in the opening direction and there is no operational resistance of the actuator 4. Therefore, the throttle section (Fig. 4A) is connected to the entire cab with both the cab link 12 and the auxiliary throttle drum 13. In the closed position, the movable actuator knee lever 6t is in the actuator section (Fig. 4B) with the coil spring 26
Thus, the carburetor lever 25 is supported in the cab fully closed position, and the fixed actuator lever 6 is supported in the cab fully closed position by the governor lever 9 and the spring 27.

On the other hand, when the vehicle is running and only the accelerator is operated and the governor is not activated, the situation is as shown in FIG.

The accelerator can go from fully closed to fully open, and the governor lever 9 can be set to O.
In the FF state, the coil spring 26 is biased in the opening direction, and there is no operating resistance of the actuator 4. Therefore, the throttle section (A in FIG. 5) forcibly moves the carburetor link system in the opening direction by the auxiliary throttle drum 13. However, the closing direction is returned by the return spring 15. In the actuator section (FIG. 5B), the fixed actuator lever 61 is fixed in the cab fully closed position by the governor lever 9, and the drive actuator lever 6 is moved by the coil spring 26. When the driver attempts to return the carburetor lever 25, the carburetor lever 25 becomes open.

Furthermore, when the governor is operated, the situation is as shown in Fig. 6, that is, the accelerator is fully open, the governor lever 9 is ON, the coil spring 26 is not biased, and the operating resistance of the actuator 4 is the gas pressure resistance and the resistance of each part in the valve opening direction. Due to the spring force, the valve is subject to the return spring force of the actuator lever and gas pressure resistance in the valve closing direction. Therefore, in the throttle section (FIG. 6A), the auxiliary throttle drum 13 does not operate, and only the carburetor link 12 operates from the 7-stage evaporator 4. Also, the actuator lever 6, . 6. grips the carburetor lever 25 by the force of the coil spring 26 and moves the valve shaft 5.

In other words, when driving, the carburetor valve shaft 5 includes the auxiliary throttle return spring 15 and the auxiliary spring 2.
2.23, the acceleration pump spring 24, and the coil spring 26 (when the secondary valve is activated, the secondary valve return spring 19 is added), and a closing force is applied. In addition, the closing force acting on the valve shaft 5 when controlling the speed with the governor is the force of the auxiliary throttle return spring 15 and the coil spring 2.
The power of 6 will be removed.

Furthermore, since the structure is such that a force is constantly applied to rotate the throttle valve 2 in the direction of closing it, even if a failure occurs in the electronic control system, the auxiliary throttle drum 13 can be manually returned at the same time. The throttle valve 2 is actuated in the closing direction by the coil spring 26, and even when the actuator is inoperable, the valve is closed by returning the throttle, thereby increasing safety.

Note that a rotation sensor 10 used to detect the engine rotation speed
The actuator 4 for opening and closing the throttle valve may preferably be a step motor.

(Effects of the Invention) The present invention provides an actuator lever 6. which rotates about the output shaft 4I of the actuator. and output shaft 4. A fixed actuator lever 6 fixed to the shaft is tensioned with a coil spring 26,
Since it is constructed with an articulated mechanism that has a slip function in which the carburetor that is fixed to the carburetor valve shaft 5 is inserted, it does not receive the reaction force of the coil spring when the actuator is activated, so the output equivalent to the reaction force is small. Since it can be controlled by an actuator and can also be controlled by an actuator with low output, the actuator can be made smaller.
This simplifies the layout of the control section, and during driving, the throttle drum receives a return force due to the dual structure of an auxiliary throttle return spring and a coil spring, which not only improves safety, but also reduces engine rotation. Even if a failure occurs in the electronic control system that controls the carburetor valve, the carburetor valve operates in the direction of closing, which prevents engine overrun and ensures safe operation control. This enables highly reliable control without any problems.

[Brief explanation of drawings]

Fig. 1 is a system explanatory diagram, Fig. 2 is a slope view, Fig. 3 is a cutaway plan view, Fig. 4 is a cutaway plan view, Fig. 6 is a front view showing the operating state in parts A and B, and Fig. FIG. 7 is a system explanatory diagram of a conventional example. 1... Carburetor, 2... Throttle valve, 3... Electronic control unit, 4... Actuator, 41
...Actuator output shaft, 5...Valve shaft, 6...
Slip mechanism, 6. ...Fixed actuator lever,
6t... Movable actuator lever, 7... Valve opening detection switch, 8... Valve opening sensor, 9... Governor lever, 10... Rotation sensor, 11... Engine stop circuit, 12. ... Carb link, 13... Auxiliary throttle drum, 14... Accelerator wire, 15... Return spring, 16... Lever, 17... Secondary operating lever, 1B... Valve lever, 19 ... Spring, 20 ... Rod, 21 ... Acceleration pump lever, 25 ... Carb lever, 26 ... Coil spring, 27 ... Return spring. 11' Fig. 4 Fig. 5

Claims (1)

[Claims] 1. The rotation of the internal combustion engine, the valve opening of the carburetor, and the signals from the valve opening detection switch are calculated by an electronic control unit, and the drive can be controlled by an actuator connected to the valve shaft of the carburetor. In the electric speed control drive device, a carburetor link is connected to an auxiliary throttle drum connected to the accelerator and provided on the valve shaft, and further fixed to the output shaft of the actuator on one side of a carburetor lever provided on the valve shaft. A movable actuator lever is provided that can be slid and rotated on the valve shaft via a coil spring that is engaged with the fixed actuator lever, and that is in contact with the other side of the carburetor lever to prevent the fixed actuator lever from being fixed. A regulating drive device for a carburetor, characterized in that it is disposed in contact with an actuator lever in a sandwiched state. 2. The device according to claim 1, wherein the actuator lever fixed to the actuator output shaft is positioned so as to be regulated by a governor lever. 3. The device according to claim 1 or 2, wherein the auxiliary throttle drum and the fixed actuator lever are each provided with a return spring. 4. Claim 2 or 3, wherein the fixed actuator lever is disposed such that it can freely approach and separate from a valve opening switch for detection that compares the current position of the actuator with the output of the potentiometer as a reference. Apparatus described in section.