JPS63167039A - Automatic speed governor for engine of working vehicle - Google Patents

Abstract

PURPOSE:To make the whole of an automatic speed governor compact, lower the cost and raise responsibility, by setting an electric servomotor as a speed governing means adapted to operate an engine governor, and constituting various setting means and condition detecting means, of electric apparatuses. CONSTITUTION:An accelerator device 24 adapted to set the rotating speed of an engine E to be high, and output this set rotating speed as an electric signal, and a set trimmer 25 adapted to set the rotating speed of the engine E to be low, and output this set rotating speed as an electric signal, are set. Then, an electric servomotor 28 is controlled according to the indications for rotating speed output from said devices 24, 25, for operating a governor 26 through a reduction gear 27. A condition detecting sensor 29 adapted to detect whether a working device A is under being driven or not being driven, is set, a selecting means 30 is controlled according to the output of this sensor 29, and consequently, high rotating speed set by the accelerator device 24, is indicated to the servomotor 28, when the working device A is under driven, and low rotating speed set by the set trimmer 25, is indicated to the servomotor 28, when the working device A is under not being driven, respectively.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a first method for setting the engine rotation speed to a high rotation speed.
A setting means and a second setting means for setting a low rotation speed are provided,
A speed regulating means is provided for regulating the speed of the engine based on a rotation speed instruction from the first setting means or the second setting means, and detects whether the working device driven by the engine is in a driving state or a non-driving state. a state detecting means for instructing the speed regulating means to set a high rotation speed set by the first setting means when the working device is in a driving state based on a detection result from the state detecting means; The engine of the work vehicle is further provided with a selection means for instructing the speed governor means to select the low rotation speed set by the second setting means when the work equipment is in the driving state. ]1llJ speed governor.

[Conventional technology]

Conventionally, in the automatic engine speed governor, the first setting means comprises a manual operating tool, the second setting means comprises a hydraulic cylinder, and the speed regulating means controls the manual operation to the operating section of the engine governor. The state detection means is composed of a first link that can mechanically transmit the operating force of the tool and a @2 link that can mechanically transmit the operating force of the hydraulic sill.
The selection means is comprised of a hydraulic circuit that detects changes in hydraulic pressure accompanying drive operations of the work equipment and transmits information via pressure oil, and the selection means includes:
It is formed of a switching mechanism that uses pressure oil from the hydraulic circuit to switch one of the eleventh and second linkages into an operating force transmitting state and the other into an operating force non-transmitting state (for example, Utility Model No. 58- 156189).

[Problem that the invention seeks to solve]

However, hydraulic cylinders and hydraulic circuits require a large amount of space, and the cost of piping is high.
In addition, since the engine governor operating section is mechanically linked to the manual operating tool and the hydraulic cylinder through the first and second linking devices, there is a lot of rattling and friction in the connecting parts of each link. , Accurately and quickly turn the engine on its own! It had the drawback of not being able to regulate the speed of 1J.

An object of the present invention is to enable automatic speed regulation of an engine without using a hydraulic circuit or mechanical linkage structure.

[Means for solving problems]

The special feature of the engine self-governing device for a work vehicle in the present invention is that the speed regulating means is composed of an electric servo motor that operates the engine governor, and the first and second setting means and the state detecting means transmit information electrically. An electric automatic comprising an electrical device that emits a signal, and a selection means emits an electrical signal for operation to the electric Tabo motor based on the electrical signals from the @l setting means, the second setting means, and the state detection means. It consists of a controller, and its functions and effects are as follows.

[For production]

In other words, since the first and second setting means and the state detection means are comprised of electrical devices that transmit information as electrical signals, they can be easily installed in a small space compared to the conventional installation of hydraulic cylinders and hydraulic circuits. You can, moreover,
Since the electric servo motor that operates the engine governor is operated by an electric operation signal issued from an electric automatic controller without using a mechanical linkage device, the engine can be speed-controlled quickly without rattling.

〔Effect of the invention〕

Therefore, the processing cost can be reduced, and the entire automatic speed governor can be made compact.In addition, the engine governor can be operated accurately, improving engine speed control performance and responsiveness. I was made to do it.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in Figure 6, a pair of left and right crawler traveling devices (l
a), (lb), and a slewing base (with a driving unit (3) and a control unit (4) on a traveling machine base with a dozer (21).
5) is attached so that it can be driven and rotated, and the boom (6) and the arm (1) are connected so that the boom (6) and the arm (1) can be driven and bent and extended.
A working vehicle is constructed so that the dust and dope work can be carried out using a pack-hook working device, which has a packet (8) attached to the tip of the workpiece so that it can be driven and moved.

Travel bag ft1! (la), (lb), a hydraulic circuit is constructed as shown in FIG. 4 to enable driving of the dozer (2), the swivel table (5), and the pack-hook working device.

That is, the control pulp (91) of the first hydraulic motor (Mt) that drives the left traveling device t (la) is connected to one (Pl) of a pair of main hydraulic pumps (Pl),
The arm (7) is moved by the arm cylinder [10
The control pulp (+1) of No. 1 is connected to the left traveling device control pulp (9) so that it is supplied with pressure oil when it is in the neutral state.

Dope silling (1 odor control pulp) that drives the dope (2) up and down, and the Patsuhoku working device
A hydraulic motor Q! controls the swing cylinder (14) which is driven to swing around the swing cylinder (14), and a hydraulic motor Q! which drives the swivel table (5). Each of the control pulps (1 to 1) of dg) is connected in parallel to an auxiliary hydraulic pump (Pg).
The control pulp αη of the hydraulic motor that drives the right side running gear fl (lb) is connected to the other main hydraulic pump (Pg).
The control pulp (19) of the boom silling Q@ that connects to the boom (6) to swing it, and the control pulp υ of the shilling (4) that swings the packet (8), respectively. It is connected in parallel to the right traveling gear control pulp αη so that it is supplied with pressure oil when it is in a neutral state. The speed increasing pulp gradient of the zoom cylinder H, the pressure oil supplied from the control pulp α to the cylinder is joined with the pressure oil from the auxiliary pump (P8) to increase the boom rising speed! 1'rI The swivel base control pulp (alpha) is connected to one pile so that pressurized oil is supplied when the swivel base control pulp α~ is in a neutral state.

The speed increasing flow path (B) for the arm cylinder 1101 is connected to the pressure oil supplied to the main pump (Pl) color control pulp (11), and the speed increasing pulp (4 is in the neutral state) is connected to the auxiliary pump (P8).
) is connected to the zoom speed increase knob (LUP) to increase the arm swing speed by merging the pressure oil from the

Then, the engine (El) provided in the driving part (3) is
When there is a heavy load of driving prisoners to the work equipment installed on the boom (6), arm (7), packet (8), etc., the machine automatically adjusts to a high rotation speed to avoid stalling. An automatic engine speed governor is provided as follows, which automatically adjusts the engine speed to a low rotational speed in order to reduce fuel consumption when the load is low and the work equipment is not operated.

In other words, as shown in Figure 1, the engine speed is set to a high speed, and the set speed is sent as a 4-speed signal to the accelerator equipped vessel, and the engine speed is set to a low speed. , a setting trimmer (to) that transmits the set rotation speed as an electric signal is provided, and based on the rotation speed instruction from the accelerator device fk t'241 or the setting trimmer C1, the governor of the engine (E) is connected to the speed reducer ( An electric servo motor (c) is provided, which is operated via a
A state detection sensor 1a (26) for detecting a sudden non-driving state is provided, and based on the ejection result from the state detection sensor 9), when the working device is indicated and the working device is in the non-driving state, The electric automatic controller contained in the microcomputer converts the low rotation speed set by the setting trimmer (c) into an electrical operation signal and instructs the servo motor (c).
It is y.

6fJ It accelerator device (to) is the accelerator lever (
24A) and the operating position (24A) using the accelerator lever (24A).
Accelerator potentiometer (24B) that detects 29)
) (Near 5) Raj 戊, also in the said engine governor) Is there a speed reducer? The governor lever (2
6A) is provided with a governor potentiometer (26C) which is interlocked and connected via a compression ring (26B), and information from the governor potentiometer (26C) is input to the automatic controller (send) and the accelerator system @ t24) or a correction unit 00 is provided on the automatic controller side so that a correction signal that eliminates the deviation of the actual position of the governor lever (26A) from the operation position of the governor lever (26A) instructed from the setting trimmer is issued on its own. It is.

And the state detection sensor? The voltage signal output from 121 (
a) In response to (Fig. 2 (a)), the working device 1M (Al driving state window detection voltage was extended for a certain period of time (1) (Fig. 2 (a))
(b)) A part of the timer that changes to signal 9 (b) is installed in the automatic controller, and switching between driving operation and stopping the driving operation of the work equipment (3) can be done in a short time and without hassle. In this case, for example, if the engine speed control by the automatic controller (30) is drastically changed and adjusted between high rotation and low rotation within a short period of time, when driving work equipment fi1 (Al), the necessary engine (E1 rotation) If the above two states of the work equipment (a) are repeated within a short period of time because the number cannot be obtained quickly and work efficiency decreases, the work equipment (a) will always be in the driving state. In one embodiment, the engine CEI is configured to have a stable rotational speed at a high rotational speed.

In addition, the automatic controller also includes a signal 8 (b) output from the force of the timer part, a signal (d
), and a switch section that selectively switches and outputs either the signal (dl or (e) as the signal (g) to the correction section pt+ based on the signal tel output from the setting trimmer (b), A comparison logic operation section (to) is provided which judges and outputs the selection switching instruction signal (f) as shown in the following table.

The signal from the correction unit υ is sent to the servo motor 028+ via the power amplifier (to).

To explain in detail, in normal cases where the engine load is high,
When performing excavation work with a high engine load, the idling speed ranges from 1000 g/min to 2600 g/m.
In, the engine automatically rises from 1,500 U/min to 2,600 rpm than J speed control.
This is because the response is better and the operability and workability are improved when the work equipment is raised to 1.5 in. In this state, when the work equipment is switched between the driving state and the non-driving state, the automatic controller automatically controls the work equipment. When driving, the engine (El is 2600
The engine (2) is set at a high rotation speed of 1,600 revolutions/min, and when the work equipment is not driven.
The rotation is controlled to a low setting of in.

However, when the heavy-duty engine (6) is left running without being worked on for an extended period of time, or when the work is done at low speed and does not place much load on the engine (E), such as leveling the excavated surface, When the engine is working (E1 time it, 1
Because it is more economical to reduce fuel consumption to a lower rotation speed than 500 E/min, the rotation speed set by the accelerator device (24J) may be lowered than the rotation speed set by the setting trimmer. , an automatic controller (30°
) is configured so that the engine (El) is speed-governing controlled.

The control in the automatic controller is performed as shown in the flowchart of FIG. 5, and the output is output to the servo motor.

signal from the timer part (b) (Fig. 2 (b)
), the signal (h) sent from the correction unit 011 to the power amplifier and the governor potentiometer (2
A (C) issued from 6C) is shown in Figure 8 (A) and @
As shown in Figure 8 (b), 1. The signal controlled by the accelerator device (24) to achieve a high set rotation speed is indicated by a solid line (it), and the signal controlled by the setting trimmer 4 to achieve a low set rotation speed is indicated by a dotted line in the figure. It is shown in (ii).

[Another example]

In addition to directly connecting the speed reducer force to the governor lever (26A), as shown in FIG. Reducer? force and accelerator device (241
It is also possible to form the trimmer □□□ into one unit to simplify the assembly to the engine.

As shown in Fig. 8, the governor lever (26A) is normally provided with a stopper η to prevent it from lowering the rotation speed below the idling position. When the governor lever (2η) is operated by the servo motor 4 with a leaf spring-like spring lever (liquor) interposed between the interlocking member (liquor) that connects the governor lever (2η) and the governor lever (2η)
6A) The structure may be such that even if the cast members are brought into contact with each other, there is a risk of continued damage, which can be prevented by the motion absorbing action of the curved spring.

The present invention can also be applied to work vehicles other than backpacks.

The accelerator device is referred to as a first projection means, the setting trimmer is referred to as a second setting means, and the state detection sensor (26) is referred to as a state detection means.

The servo motor (c) is referred to as a speed regulating means, and the automatic controller (29) is referred to as a selection means.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, it is clear from the entry I that the present invention is not limited to the structure shown in the attached drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the engine self-speed regulating device for a working vehicle according to the present invention, and 1V is a schematic diagram showing the operating structure of the engine self-help speed regulating device, @2 (a), (b), and 8. stomach),(
b) are graphs showing the output status of each signal, Fig. 4 is a hydraulic circuit diagram, Fig. 6 is a flowchart, Fig. 6 is an overall side view of the work vehicle, and Figs. 7 and 8 are respective side views. FIG. 3 is a perspective view showing the operating structure of the embodiment. (To)...First setting means, Fourth...Second setting means, Part 2...Engine governor, (C)...
...speed regulating means, 4...state detection means, -...
...selection means, (El...engine, prisoner)
...Working equipment. Agent Patent Attorney Osamu Kitamura Figure 2 e4!1lll Figure 5 Haruma

Claims (1)

[Claims] The first setting means (24) sets the rotation speed of the engine (E) to a high rotation speed, and the second setting means (24) sets the rotation speed of the engine (E) to a low rotation speed.
5) is provided, and speed regulating means (28) is provided for regulating the speed of the engine (E) based on the rotation speed instruction from the first setting means (24) or the second setting means (25), A state detection means (29) is provided for detecting whether the working device (A) driven by (E) is in a driven state or a non-driven state,
Based on the detection result from the state detection means (29),
When the working device (A) is in the driving state, the high rotation speed set by the first setting means (24) is set by the speed regulating means (28).
and selecting means (30) for instructing the speed regulating means (28) to specify the low rotation speed set by the second setting means (25) when the working device (A) is in a non-driving state. An automatic engine speed governor for a working vehicle, in which the speed governor (28) comprises an electric servo motor that operates an engine governor (26), and the first and second setting means (
24) (25) and the state detection means (29) are composed of electrical equipment that transmits information as an electrical signal, and the selection means (30) is configured to include the first setting means (24) and the second setting means (25). ) and an electric automatic controller that generates an electric signal for operating the electric servo motor based on the electric signal from the state detecting means (29).