JPH02294526A - Speed governor for diesel engine - Google Patents

Abstract

PURPOSE:To operate a fuel control member properly by providing an emergency governor driving member capable of driving a movable iron core and enabling the emergency governor driving member to be interlocked and connected to the accelerator by an emergency connecting mechanism. CONSTITUTION:An actuator 5 with a movable iron core 6 which is connected to a fuel control member 8, an accelerator sensor 12, and an electronic control circuit 11 are provided. Emergency governor driving members 40 and 41 capable of driving the movable iron core 6 are provided. The emergency governor driving members 40 and 41 are waited outside the operating range of the movable iron core 6, and can be interlocked and connected to an accelerator by means of a detachable emergency connecting mechanism 58. Thus, the fuel control member can be operated properly by the operation of the accelerator.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electronically controlled diesel engine speed governor.

(Prior art) Recently, electronically controlled speed governors for diesel engines have come into widespread use, but for agricultural machinery such as tractors and combines, various Failure may occur. For example, battery discharge, low voltage due to defective circuit elements such as electrolytic capacitor resistance, disconnection of cords due to vermin such as rats, poor contact due to vibration, poor insulation due to muddy water, etc., and malfunctioning of various sensors. If the speed governor of the control system becomes inoperable, the tractor, combine harvester, etc. cannot be operated.

In the past, as in Japanese Patent Publication No. 63-34307, a control device has been developed that can automatically maintain a predetermined low rotation speed in the event of a potentiometer (accelerator sensor) failure. Rotation speed cannot be controlled.

(Purpose of the invention) The present invention is aimed at
It is an object of the present invention to provide a diesel engine speed governor capable of arbitrarily controlling the amount of fuel injection by switching to a mechanical governor control method.

(Technical Means for Achieving the Object) In order to achieve the above object, the present invention connects a movable iron core of an actuator operated by an output signal of an electronic control circuit to a fuel regulating member, and detects accelerator operation. In an electronically controlled diesel engine speed governor in which an accelerator sensor is connected to the electronic control circuit, an emergency governor drive member capable of driving the movable iron core is provided, and the emergency governor drive member is connected to the movable iron core. The emergency governor drive member can be connected to the accelerator by a removable emergency connection mechanism that is placed on standby outside the operating range of the accelerator and is normally removed.

(Function) Normally, the emergency coupler tM is removed from the emergency governor drive part shrine and stored in a tractor or the like, and the speed is controlled by electronic control.

When the emergency coupling mechanism is removed, the emergency vane drive member is kept on standby outside the operating range of the movable iron core of the actuator by means of a return spring or the like.

Therefore, the operation of the accelerator (depression) is detected by the accelerator sensor, and is input to the electronic control circuit along with other input factors such as the number of revolutions or the position of the pedal, and is integrated. Then, the fuel: IJm member is moved via the movable iron core of the actuator in response to an output signal from the electronic control circuit, and the fuel injection amount is adjusted.

If the electronic control circuit or the like fails, the electric connection between the electric control circuit and the actuator is cut off, an emergency connection mechanism is installed, and the emergency governor drive member is interlocked and connected to the accelerator. As a result, the amount of fuel injection is mechanically adjusted by operating the accelerator, and the tractor or the like can be operated as desired.

(Example) Fig. 2 is a schematic diagram of the entire side of a speed governor to which the present invention is applied during normal operation (during electronically controlled operation). In Fig. 2, 1 is a fuel injection pump case; It is equipped with a large-sized fuel injection pump 2 and a fuel metering rack 8. 3 and 4 are a governor case and a governor cover,
A solenoid 5 is connected to the fuel injection bomb case 1 and serves as an actuator, and a movable iron core 6 is disposed within the solenoid 5 and is movable in the direction of movement of the entire fuel adjustment rack 8 (direction of increase/decrease in fuel). Movable iron core 6 is fuel 5!
It is interlocked and connected to the Jfa rack 8, and the position of the iron core 6 in the direction of increase/decrease of the fuel 24 changes according to the increase/decrease of the current flowing through the solenoid 5.

The solenoid 5 is connected to an electronic control circuit 11 via a connector 9 in a disconnectable manner, and an accelerator sensor (potentiometer) 12 is connected to the electronic control circuit 11. The control lever 15 of the accelerator sensor 12 is interlocked and connected to the arm portion 18 of the accelerator pedal 17 via an accelerator connecting rod 16, and the rotational position of the control lever 15 is changed in accordance with the depression of the accelerator pedal 7. This detects the second depression, converts it into an electrical signal, and inputs it to the power-off control circuit 11.

In FIG. 3 showing an enlarged vertical cross-sectional view of the inside of the governor case 3 and cover 4, if it is assumed that the fuel injection pump 2 side is the front side, the fuel metering knob 8 is moved to the fuel reduction side by the return spring 21 via the spring receiver 23. (backward side). The small-diameter rod portion 6a of the iron core 6 is in contact with the rear end of the fuel metering rack 8, and a position sensor bar 22 extending downward is fixedly attached to the movable iron core 27 of the position sensor solenoid 26. is engaged with the front end of the The position sensor solenoid 26 is connected to the electronic control circuit 11, detects the position of the fuel melon rack 8, converts it into an electrical signal, and inputs the electrical signal to the electronic control circuit 11. Further, a rotational speed sensor 33 is disposed opposite to the gear 31 of the camshaft 30 to detect the rotational speed, convert it into an electrical signal, and input it to the electronic control circuit 11.

The emergency governor drive member, which is the essential part of the invention, consists of a push rod 40, a drive link 41, and the like. The pushon rod 40 is disposed coaxially with the 6I dynamic core 6, and is inserted and supported by a pusher 45 fixed to the cover lid 43 so as to be movable in the axial direction, and its front end is connected to the rear end of the 6I dynamic core 6. Opposite the curve, the rear end is connected to the drive link 4 via the pin 48.
] is engaged with the upper end elongated hole 46. The drive link 41 is rotatably supported by the bracket 50 via a pin 47 and extends downward. For example, three rod attachment holes 52 are formed below the pin 47 at equal intervals from the lower end. Further, a spring engagement hole 54 is formed thereon. A return spring 53 is stretched between the spring engagement hole 54 and the front bracket 57, and by pulling the lower part of the drive link 41 forward with the return spring 53, the push rod 40 is moved to the I moving iron core 6. is biased to the standby position (retracted position) outside the operating range.

The connection mechanism for connecting the drive link 41 and the control lever 15 of the accelerator sensor 12 shown in FIG. 2 in an emergency is as follows:
An emergency connecting rod 58 is prepared. The connecting rod 58 has male threaded portions 58a at its front and rear ends, and a connecting shaft 55 is fitted into each male threaded portion 58a so as to be adjustable in its position in the longitudinal direction.
Fixed by Also, at the lower end of the control lever 15 is a mounting hole 6 for attaching an emergency connection rod 58.
0 is formed.

FIG. 4 is a view in the direction of arrow ■ in FIG. 3, showing details of the mounting structure of the coupling shaft 55, and the front coupling shaft 55
The small diameter portion 55a is rotatably inserted into the rod attachment hole 52, and is prevented from coming off by a washer 61 and a split pin 62. The bracket 50 for supporting the drive link is attached to the cover lid 43 by five bolts.
It extends downward to guide and cover both sides of the drive link 41, thereby preventing the drive link 41 from wobbling in the direction of the pin.

5 and 6 show details of the rear coupling shaft 55 that is detachably attached to the control lever 15 of the accelerator sensor 12, and has the same mounting structure as the front coupling shaft 55.
It includes a small diameter portion 55a, a washer 61, a split bottle 62, and the like. Further, the accelerator connecting rod 16 is also operatively connected to the control lever 15 using a similar connecting shaft 69 and the like.

Next, the effect will be explained. When a tractor or the like is normally used under electronic control, the connector 9 is connected as shown in FIG. 2, while the emergency connecting rod 58 is removed. At this time, the drive link 41 is pulled by the return spring 53, and the push rod 40 is located at a standby position (retracted position) outside the operating range of the movable iron core 6.

Therefore, the amount of depression of the accelerator pedal 17 is detected by the accelerator sensor 12 via the accelerator connecting rod 16 and the control lever 5, and is input to the electronic control circuit 11 together with other input factors such as the rotation speed or rack position, and is integrated. Ru. Then, the fuel:A amount rack 8 is moved via the movable iron core 6 in response to an output signal from the electronic control circuit 11, and the amount of fuel to be injected is adjusted.

If the electronic control circuit or the like breaks down, disconnect the connector 9 as shown in FIG. It is pivotally connected to the drive link 41 and the control lever 15 via a coupling shaft 55. As a result, the movement of the accelerator pedal 17 is transmitted to the drive link 41 via the connecting rod 16, control lever 15, and emergency connecting rod 58, and the push rod 40 pushes the movable iron core 6 to mechanically inject the fuel. L can do it.

1jJ H L/To adjust the relative position between the bar 15 and the connecting rod 58, loosen the front and rear nuts 56 and turn the control lever 15.
The operator moves the nut 56 to an appropriate rotation position and tightens the nut 56 at that position.

In addition, in FIG. 2, the coupling shaft 55 is attached to the emergency coupling rod 58 during normal operation and stored, but the coupling shaft 55 is always attached to the control lever 15 and the drive link 41, and the emergency coupling is Rod 58 and nut 56 may be removed.

(Alternative Embodiments) (1) Instead of the rod, a Bowden wire or a push bull wire may be used as the emergency coupling mechanism. In this case, a wire fixing bolt 70 is screwed onto the coupling shaft 55 as shown in FIG. 7, and the wire 71 passed through the hole in the coupling leg 55 is fixed by the wire fixing bolt 70.

(Effects of the Invention) As explained above, the present invention provides a fuel metering member (fuel.
an actuator having a movable iron core 6 connected to an ffi rack 8), an accelerator sensor 12 and an electronic control circuit 11;
In the speed governor for a diesel engine with a power-off control system, the r+J moving iron core 6 is connected to a drive port.
The governor drive member for the emergency 11ν is connected to the movable iron core 6.
The emergency coupling mechanism (connecting rod 58) is detachable and can be connected to the accelerator in a standby position outside the operating range of the accelerator. , fuel 2E1 by accelerator operation
The members can be operated accordingly.

For example, in tractors, etc., the working environment (muddy water, vibration),
Even if electronic control becomes impossible due to storage conditions (damage caused by cords being cut by rats, battery discharge, etc.), the work equipment can be operated in an emergency manner or work can be continued without stopping the engine.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a schematic side view showing the state of the governor to which the present invention is applied in an emergency; Fig. 2 is a schematic side view showing the state during normal operation (electronically controlled operation); Figure 3 is an enlarged vertical cross-sectional view of the governor device, Figure 4 is a view in the direction of the ■ arrow in Figure 3, Figure 5 is an enlarged side view of the accelerator sensor, and Figure 6 is a cross-sectional view of Figure 5. 7
The figure shows a modification of the emergency coupling mechanism, and is a sectional view corresponding to FIG. 6. 5... Solenoid (an example of actuator), 6... Movable iron core, 8... Fuel metering rack (fuel, Mffi member), 11... Power-off control circuit, 12... Accelerator sensor , 15... Control lever, 17... Accelerator pedal, 40, 41... Push rod, emergency governor drive link (emergency governor drive member), 58... emergency connecting rod (emergency Coupling machine {1 A Patent applicant Yanmar Diesel Co., Ltd. Fig. 1 Fig. 3 Fig. 2 Fig. 5 Fig. 6 Fig. 111 5] Fig. T

Claims (1)

[Claims] In an electronically controlled diesel engine speed governor, in which a movable iron core of an actuator operated by an output signal from an electronic control circuit is interlocked and connected to a fuel metering member, and an accelerator sensor for detecting the amount of accelerator operation is connected to the electronic control circuit. , an emergency governor drive member capable of driving the movable iron core is provided, the emergency governor drive member is placed on standby outside the operating range of the movable iron core, and a removable emergency connection mechanism is provided that is detachable during normal times. A speed governor for diesel engines that allows the emergency governor drive member to be connected to the accelerator.