JPH0426678Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a remote control device for remotely controlling a governor of a diesel engine installed in a construction machine such as a crane or a shovel.

(Prior art) The output and speed of diesel engines, which are generally installed in construction machinery such as cranes, can be changed by adjusting the rotation of a governor control lever through operation from the operation control unit. . The engine and driver's seat, etc., which are the power source for traveling, turning, and lowering the boom, are installed on the vehicle body or revolving structure, but the driver's seat may be removed when assembling or disassembling the machine. It may be moved.

Conventionally, remote control of the engine governor in such construction machinery has been performed by mechanical means such as a wire cable or link rod, or by hydraulic control. However, this method has the disadvantage that if the distance from the control unit to the governor is long, a large operating force is required and responsiveness decreases, and the driver's seat must be removed. There was a problem in that it was difficult to connect the operating section and the governor when moving or moving the device.

(Purpose of the invention) In view of these circumstances, the present invention has been developed to remotely control the governor using electric control, thereby reducing the operating force and providing responsive remote control over long distances. It is easy to attach, detach, and move the operating part, and it is easy to operate and economical.In addition, it has versatility and control accuracy for various engines with different lengths and strokes of the governor control lever. The present invention provides an excellent remote control device for an engine governor.

(Structure of the invention) The present invention connects the control lever of the engine governor and the output shaft of the governor adjustment drive unit equipped with a motor through an interlocking mechanism composed of links and rods, and The governor adjustment drive section is provided with a rotation range adjustment means for setting the rotation range of the shaft to be changeable, and the governor adjustment drive section detects the amount of adjustment of the control lever by the drive section and outputs an adjustment amount detection signal corresponding thereto. an amount detector, a command section that detects the operation amount of the operation section for remotely controlling the governor by the operation amount detector and outputs a command signal of the adjustment amount according to this operation amount; A control circuit is provided for receiving each signal from the adjustment amount detector and controlling the drive unit, and the adjustment amount detection signal and the command signal are inputted to this control circuit, and the fluctuation ranges of both signals are made to correspond to each other. an input section that can adjust the signal level; a comparison section that compares the command value of the control lever adjustment amount based on the command signal with the detected value based on the adjustment amount detection signal and determines the difference between the two; and a control section that receives an output from the drive section and outputs a drive signal to the drive section to adjust the governor in a direction to reduce the difference when the difference between the command value and the detected value exceeds a predetermined value. It is.

With this configuration, depending on the amount of operation of the operation section,
The control lever of the governor is electrically controlled by feedback. Also,
Even if the governor stroke etc. changes due to differences in the model of the engine being used, or if there are variations in the engine output adjustment characteristics by the governor, the adjustment by the rotation range adjustment means or the signal input level by the input section can be adjusted. Accuracy of control is ensured by adjusting.

(Embodiment) FIG. 1 schematically shows an embodiment of the device of the present invention.
In this figure, 1 is the governor of the engine installed in the construction machine, 2 is the control lever of this governor 1, and the governor 1 is controlled according to the rotational position of the control lever 2, as is generally known. The structure allows the rotational speed of the engine to be adjusted by adjusting the engine output. 3 is a drive unit for governor adjustment,
The motor 30 is the driving source, and the output shaft 31 is the link 4.
It is connected to the control lever 2 via an interlocking mechanism 4 consisting of a rod 4a and a rod 4b, and the control lever 2 is actuated by the drive of a motor 30. This drive unit 3 includes
An adjustment amount detector 5 is equipped, which detects the amount of adjustment of the control lever 2 by the drive unit 3 by detecting the rotation angle of the output shaft 31, and outputs an adjustment amount detection signal corresponding to the amount of adjustment. ing.
The adjustment amount detector 5 includes a potentiometer, a pulse encoder, etc., and is designed to detect the rotation angle of the output shaft 31 with reference to the idling state of the engine. The adjustment amount detector 5 may be one that detects the amount of displacement of the control lever 2, the link 4a, or the rod 4b.In short, the adjustment amount detector 5 detects how much the control lever 2 is moved based on the idling time. , any device that outputs an electrical detection signal corresponding thereto may be used.

Reference numeral 6 denotes a command unit installed in the driver's cab, etc., which includes an operating unit 60 such as an accelerator pedal, a twist grip, or a lever, and an operating amount detection unit that includes a potentiometer, a pulse encoder, etc. that detects the operating amount of this operating unit 60. The controller 61 outputs a command signal for adjusting the amount of control lever 2 in accordance with the amount of operation. Reference numeral 7 denotes a control circuit which receives outputs from the adjustment amount detector 5 and command section 6 and controls the motor 30 of the drive section 3, as will be described in detail later.

The drive section 3 and the control circuit 7 are installed in the body of the construction machine along with the engine in a state where they are electrically connected via a cord, and the command section 6 is connected to the circuit body etc. as described later. It is installed in the removable driver's cab, external control section, etc.
The command unit 6 and the control circuit 7 are electrically connected to each other via a connector such as a cord and a detachable connector.

2 and 3 show the specific structure of the drive section 3. FIG. In the illustrated example, the drive unit 3 is formed using an existing automobile wiper motor for convenience in manufacturing. That is, in this wiper motor, an output shaft 31 is connected to a motor 30 capable of forward and reverse rotation via a reducer 32, and a gear 31a attached to the output shaft 31 is attached to a subshaft 33. A fan-shaped gear 33a meshes with the fan-shaped gear 33a, and limit switches 34 and 34' are provided for detecting the lower and upper limits of the rotation range. 31, the link 4a of the interlocking mechanism 4
is installed. This link 4a is formed shorter than the control lever 2, so that the reduction ratio between the output shaft 31 and the control lever 2 can be appropriately increased. Further, the rotation range of the output shaft 31 is set to the control lever 2.
In order to correspond to the movable range of the output shaft 31, a rotation range adjusting means is provided to changeably set the rotation range of the output shaft 31. As this rotation range adjusting means, a cam 35 is installed on the output shaft 31 so that its position can be adjusted, and a limit switch 36 facing this cam 35 is equipped. The motor 30 is stopped when the output shaft 31 rotates, and the rotational range of the output shaft 31 can be adjusted by adjusting the rotational direction position of the cam 35 in advance. Furthermore, with respect to the sub-shaft 33,
A potentiometer 5a constituting the adjustment amount detector 5 is provided. This potentiometer 5a is adapted to detect the rotation angle of a subshaft 33 interlocked with the output shaft 31 and output a detection signal corresponding thereto, and is attached to a mounting plate 37. The limit switches 34, 34', 36 and the potentiometer 5a are electrically connected to a connector 39 attached to the cover 38.

4 and 5 show specific examples of the operation section 60 and operation amount detector 61 in the command section 6. In the example shown in these figures, a Swiss grip is used as the operation section 60, and inside thereof, Potentiometer 6 constituting the manipulated variable detector 61
1a is provided. That is, the operation part 60 has a cylindrical grip 63 rotatably attached to a lower fixing part 62, and has a fixing frame 64 inside thereof, and a potentiometer 61a is attached to the fixing frame 64. There is. The above grip 63
is a circumferential elongated hole 65 formed in the fixed frame 64.
The rotation range is regulated by the pin 66 fixed to the grip 63 and engaged with the elongated hole 65.
It is possible to rotate within a range between a reference position shown in the figure (a position corresponding to an idling state) and a maximum operating position rotated by a predetermined angle in the direction of the arrow from this position. Further, the output of the potentiometer 61a changes according to the rotation of the potentiometer shaft 61b.
is a mounting portion 67 and a screw 6 whose relative position in the rotational direction with respect to the potentiometer shaft 61b has been adjusted in advance.
The potentiometer 61a is connected to the grip 63 via 8 and 69, so that a detection signal corresponding to the rotation angle of the grip 63 from the reference position is outputted from the potentiometer 61a.

As shown in FIG.
an input section 74 that inputs the signal from 1 as a command signal for the control lever adjustment amount; and a comparison section that compares the detection signal from the adjustment amount detector 5 inputted via these input sections 73 and 74 with the command signal. 71, a control section 72 that receives the output of the comparison section 71, and an output section 75 that outputs the motor control signal from the control section 72 to the drive section 3. The input section 74 has a function of adjusting the level of the input signal using a span adjustment resistor or the like. The level of the signal input from the operation amount detector 61 is adjusted so that the range of operation of the control lever 2 by the drive unit 3 corresponds to the range of operation of the control lever 2 by the drive unit 3.

The comparison section 71 and the control section 72 are configured to perform the processing shown in the flowchart of FIG.

In this flowchart, we will first
In S ₁ to _{S 3} , the processing as the comparison section 71 is performed, that is, the control lever adjustment input from the adjustment amount detector 5 and the operation amount detector 61 to the comparison section 71 via the input sections 73 and 74, respectively. Detection value of amount
P ₁ and command value P ₂ are compared, and a difference A between the command value P ₂ and the detected value P ₁ is determined. Next, in steps _S4 to _S8 , the control section 72 performs processing, and in step _S4 , it is checked whether the absolute value of the difference A is greater than or equal to a predetermined value K. This predetermined value K teeth is set to a minute value equivalent to a control error due to backlash of the connecting portion of the drive section 3, etc. If the absolute value of the difference A is less than a predetermined value K, the motor 30 is stopped in step _S5 , and if it is greater than the predetermined value K, it is determined in steps _S6 to _S8 whether the difference A is positive or not. A signal for driving the motor 30 in the forward rotation direction or the reverse rotation direction is output depending on the negative value, that is, a drive signal is output for adjusting the governor 1 in a direction that makes the difference A smaller. Thereafter, the process returns to step _S1 and the subsequent processing is carried out.

By electrically controlling the drive section 3 in the manner described above, the operating section 6
When the manipulated variable 0 is changed, the motor 30 of the drive unit 3 is driven until the command signal that changes accordingly and the detection signal from the adjustment amount detector 5 almost match. Therefore, the control lever 2 of the governor 1 is rotated and the engine output and speed are controlled in accordance with the manipulated variable. Further, after the governor 1 has been adjusted in this manner, when the operating section 60 is maintained at a constant operating position and enters a constant speed operating state, this state is maintained by stopping the motor 30. Ru. Therefore, no power is consumed in the drive unit 3 during constant speed operation.

Furthermore, since the command section 6 and the control circuit 7 can be electrically connected via a cord and a detachable connector, the operator's cab can be removed from the vehicle body or revolving body of a crane, etc., and the command can be sent to the outside. The governor 1 can be easily remotely controlled even in the case where the section 6 is placed. In other words, in construction machinery such as cranes, the operator's cab is normally attached to the car body or rotating body, but when assembling or disassembling the machine, the operator's cab is removed and rotated relative to the car body so as not to interfere with work. Operations may be performed to align the body, and in such cases, it is necessary to control the governor 1 from an external driver's cab or a separately provided control section. In this case, according to the above-described electrical control device, the command section 6 and the control circuit 7 installed in the driver's cab or control room can be easily attached and detached, and the distance between the command section 6 and the governor 1 can be reduced. Even if the length increases, the responsiveness will not deteriorate or large operating force will be required.Also, for one governor 1, multiple command units 6 are provided in the operator's cab, control unit, etc. These can also be connected to the control circuit 7 so that the governors 1 of a plurality of engines can be controlled by the command unit 6 that is used selectively or placed in one location (for example, in a control room).

In addition to the device of the present invention, as a means to electrically control the governor, it is also possible to use a switch that simply switches a motor for regulating the governor into a driving state using a switch. However, with such means, it is necessary to operate while watching a monitor device such as the engine speed.
The engine speed is controlled correspondingly by simply adjusting the position of the twist grip, accelerator pedal, etc., making the operation simple. In addition, when the device of the present invention is used for various types of engines, the level of the signal is adjusted at the input section 74 of the control circuit 7 as an initial setting, so that the governor stroke can be adjusted depending on the model etc. Even if the operating amount variation range of the operating unit 60 changes and the control lever adjustment range can be matched. Furthermore, by adjusting the position of the cam 35 of the rotation range adjusting means of the drive unit 3,
The governor stroke can also be adjusted in accordance with variations in output characteristics among engines. Therefore, by making these adjustments in advance, accurate control can be performed even if there are differences in model or variations in output characteristics between engines.

(Effects of the invention) As described above, the invention provides a governor for an engine installed in construction machinery, etc., which includes a drive unit for adjusting the governor equipped with a motor and a command signal that outputs a command signal according to the amount of operation of the operation unit. Electrical remote control is performed using a command unit and control circuit, so even if the distance from the operation unit to the governor is long, there is no need to increase the force required for operation, and the control is responsive and responsive. This also facilitates the connection between the governor and the operating section when the driver's cab is removed or moved. Furthermore, a detection signal from an adjustment amount detector that detects the amount of adjustment of the governor control lever by the drive unit is compared with a command signal from the command unit, and the motor 30 of the drive unit 3 is feedback-controlled in accordance with the command signal. Therefore, the output and speed of the engine can be easily and accurately adjusted simply by adjusting the amount of operation of the operation section 60, and the motor 30 of the drive section 3 is stopped during constant speed operation. Therefore, electric power for governor adjustment is saved, and it is also economical. Further, since the governor control lever and the output shaft of the governor adjustment drive section are connected via an interlocking mechanism constituted by a link and a rod, control can be performed with good responsiveness. Furthermore, a rotation range adjusting means for setting the rotation range of the output shaft to be changeable is provided in the governor adjustment drive section, and the variation range of the adjustment amount detection signal and command signal is adjusted at the input section of the control circuit. Since the signal level can be adjusted so as to cause the engine to change, it has excellent versatility and accuracy for various types of engines.

[Brief explanation of drawings]

Fig. 1 is an overall schematic diagram showing one embodiment of the device of the present invention, Fig. 2 is a front view showing the specific structure of the drive section for governor adjustment, Fig. 3 is a plan view thereof, and Fig. 4 is a specific structure of the command section. A sectional view showing the structure, Fig. 5 is a - of Fig. 4.
The line sectional view and FIG. 6 are flowcharts showing a specific example of control by the control circuit. 1...Governor, 2...Control lever, 3
... Drive section, 30 ... Motor, 31 ... Output shaft,
4... Interlocking mechanism, 5... Adjustment amount detector, 6... Command section, 60... Operation section, 61... Operation amount detector,
7... Control circuit, 71... Comparison section, 72... Control section.

Claims (1)

[Scope of utility model registration request] The engine governor control lever and the output shaft of the governor adjustment drive unit equipped with a motor,
The governor adjustment drive section is provided with a rotation range adjustment means that is connected through an interlocking mechanism constituted by a link and a rod, and that allows the rotation range of the output shaft to be changed, and is controlled by the drive section. An adjustment amount detector detects the lever adjustment amount and outputs an adjustment amount detection signal corresponding to the adjustment amount, and an operation amount detector detects the operation amount of the operation section for remotely controlling the governor and responds according to this operation amount. A command section outputs a command signal for the adjustment amount, and a control circuit receives signals from the command section and the adjustment amount detector to control the drive section. An input section into which a signal and a command signal can be input and whose signal level can be adjusted so as to correspond to the fluctuation range of both signals, and a command value of the control lever adjustment amount based on the command signal and the adjustment amount detection signal. A comparison section that compares the detected value to find the difference between the two, and receives the output of this comparison section, and operates a governor in a direction to reduce the difference when the difference between the command value and the detected value exceeds a predetermined value. 1. A remote control device for an engine governor, comprising: a control section that outputs a drive signal to be adjusted to the drive section.