JP2582923B2 - Engine output control device for work vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is provided in a state where an adjusting operation section of an output adjusting means of an engine is urged to return to a low output side, and is manually linked to the adjusting operating section. For a work vehicle, an artificial operation tool is linked so as to be capable of interlocking operation via a mechanism, and friction type holding means for holding a position in a set output state by the artificial operation tool is provided in the manual link mechanism. The present invention relates to an engine output control device.

[Conventional technology]

In a work vehicle, the engine is operated while the output adjustment means of the engine is maintained at a set output state such as a rated output. Therefore, the engine output control device having the above-described configuration is such that the adjusting operation section can be held at an arbitrary output setting position set by the artificial operation tool against the return biasing force by the friction type holding means. It is. Incidentally, in the case of a diesel engine, the output adjusting means corresponds to a governor, and the adjusting operation section corresponds to a governor speed control lever.

By the way, when a load larger than the set output state is applied to the engine in a state where the set is set to the output state by operation of the artificial operation tool, the engine speed may be significantly reduced and the engine may stall. In order to avoid engine stall, when an overload is applied, it is necessary to operate the adjusting operation tool to increase the output, but conventionally, it is necessary to manually operate the artificial operation tool according to the overload Output recovery.

[Problems to be solved by the invention]

However, in the configuration in which the adjustment operation section of the output adjustment unit is manually operated as in the above-described conventional configuration, there is a risk that the operation for recovering the output at the time of overload may stall with a delay.

The present invention has been made in view of the above circumstances,
The purpose is to automatically recover the output of the engine when overloaded.

[Means for solving the problem]

The characteristic configuration of the present invention is provided in a state in which the adjusting operation section of the circumferential force adjusting means of the engine is urged to return to the low output side, and the adjusting operation section is manually operated so as to be capable of interlocking operation via a manual linkage mechanism. An engine output control device for a work vehicle, wherein a friction type holding means for holding a position in a set output state by a manual operation tool is provided in the manual linking mechanism. A mechanism is provided in a state having flexibility to allow the adjustment operation unit to move to the output increasing side regardless of a holding state by the friction type holding unit, and a mechanism of the artificial operation tool is provided with respect to the adjustment operation unit. An actuator that is linked to be capable of interlocking operation via an automatic linking mechanism having flexibility to allow operation, and that operates the adjustment operation unit on the output increasing side from the set output state;
Load detecting means for detecting a load state of the engine, and control means for automatically operating the actuator as the load of the engine becomes larger than a set value based on information of the load detecting means. It is in the point provided.

[Action]

By detecting the load state of the engine, when the detected load is larger than the set value, by operating the actuator, by operating the adjustment operation unit of the output adjustment means to the output increase side than the set output state, Compared to manual operation, the output of the engine can be recovered more quickly and automatically.

Moreover, the manual linking mechanism for linking the adjusting operation tool and the manual operation tool is provided with a flexibility that allows the adjustment operating section to move to the output increasing side regardless of the holding state by the friction type holding means. The actuator may be operated against the return biasing force of the adjusting operation tool toward the low output side, and in addition to the return biasing force, the actuator is operated against the frictional holding force of the friction type holding means. Such a large operation force is not required, and a small output type actuator can be used.

〔The invention's effect〕

Therefore, even if there is a temporary increase in the load, the output of the engine can be automatically and quickly recovered, so that the engine stall due to the temporary overload can be prevented. Moreover,
It can be handled with a small actuator of small output type, for example,
There is also an advantage that the configuration can be simplified as compared with the case where a large output type actuator for operating against the holding force of the friction type holding means is used.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to an output control device of a diesel engine for a work vehicle will be described with reference to the drawings.

As shown in FIG. 1, a diesel engine (E) mounted on a working vehicle for driving a traveling device or various working devices (not shown) is controlled by a governor (1) (an example of an output adjusting means). By swinging the speed lever (2) (an example of an adjusting operation unit), the output can be changed to a large or small value.

The speed control lever (2) is provided in a state where it is urged to return to the starting position, and is manually linked with a manual adjustment lever (4) by a release wire (3) as a manual link mechanism.
It is designed to be artificially operated by (an example of an artificial operation tool). However, the manual adjustment lever (4) can be held at the current operating position by a friction holding mechanism (5) (an example of a friction type holding means). That is,
The governor (1) is held in the set output state by holding the speed control lever (2) at a desired operation position by the manual adjustment lever (4).

The speed control lever (2) can also be operated by an operation arm (7) driven by a servo electric motor (6) as an actuator.
In addition, the first rod (8A) connected to the speed control lever (2) and the second rod (8B) connected to the operation arm (7) are connected to the speed control lever (2) by the second rod (8B). ) So that the first rod (8A) can be pushed and moved only when moving to the side.
The pins (a) on the first rod side and the brackets (b) on the second rod side are connected by contact. Also, so that the pin (a) and the bracket (b) come into contact with each other,
A spring (8) for urging the first rod (8A) and the second rod (8B) away from each other is provided. That is, the first rod (8A), the second rod (8B), the spring (8), the pin (a), and the bracket (b) are provided with an automatic mechanism provided with flexibility to allow operation of the manual adjustment lever (4). Thus, a linking mechanism is configured. The governing lever (2), which has been urged to return to its starting position, can be operated by the manual adjustment lever (4) and also by the electric motor (6). By providing flexibility between the speed control lever (2) and the operation arm (7) while utilizing the spring (8), the operation by the electric motor (6) is performed by the manual adjustment lever (4). The priority is given to the operation of the governing lever (2) toward the maximum output position. In addition, the electric motor (6)
When the speed control lever (2) is operated to the maximum output position side, the slackness of the release wire (3) allows the manual adjustment lever (4) to cooperate with the speed control lever (2). Has become. Therefore, the release wire (3) is provided in a state that has a flexibility that allows the speed control lever (2) to move toward the output increasing side regardless of the holding state by the friction holding mechanism (5).
In the drawing, (9) is an engine stop lever.

Generally, after the engine (E) is started by operating the manual adjustment lever (4) to the starting position, the manual output lever (4) is set to a set output lower than the maximum output of the engine (E). It is designed to operate in a state where it is held at the rated output position corresponding to the state.

A rotation sensor (10) for detecting a rotation speed of the engine (E) as load detection means for detecting a load state of the engine (E); and the engine based on information of the rotation sensor (10). (E) a control device (11) as control means for automatically operating the electric motor (6) as the load becomes larger than a set value;
Thus, when a temporary overload is applied, the speed control lever (2) is operated to the maximum output position, which is on the output increase side from the set output state set by the manual adjustment lever (4). Thus, the output of the engine (E) can be automatically restored.

In addition, as shown in FIG. 2, a work vehicle is generally operated at a rated speed at which the output of the engine (E) becomes a rated output. Therefore, the manual adjustment lever (4) is artificially operated to determine the no-load speed so that the rated speed is achieved with the set load applied, and start the operation. Accordingly, the engine speed decreases.

Therefore, the load state of the engine for the work vehicle can be determined based on how much the detected rotation speed decreases from the no-load rotation speed.

That is, a load state of the engine (E) is detected based on the information of the rotation speed sensor (10), and it is determined whether the load is larger than a preset value. And when it is determined that the load is overloaded, the electric motor (6) is operated to operate the operating lever (2) to the maximum output position to increase the fuel injection amount, The output of the engine (E) is automatically restored.

When the detected load condition recovers to a value smaller than the set value, the electric motor (6) is rotated in the reverse direction,
It will return to the original setting output state. That is, the control device (11) operates the electric motor (6) so that the operation arm (7) is operated to the maximum output position when the overload is detected as described above, and is otherwise operated to return to the starting position. Is activated.

(Another embodiment)

In the above embodiment, the case where the electric motor (6) is used as the actuator has been exemplified. However, for example, a solenoid or the like may be used, and the specific configuration of the actuator can be variously changed.

Further, in the above-described embodiment, the case where the present invention is applied to the output control device of the diesel engine has been described.
The present invention can be applied to a gasoline engine, and the specific configuration of each unit such as an output adjusting unit can be variously changed.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

The drawings show an embodiment of an engine output control device for a work vehicle according to the present invention. FIG. 1 is an explanatory diagram of the device configuration, and FIG. 2 is an explanatory diagram of an engine output. (E) ... engine, (1) ... output adjustment means, (2)
…………………………………………………………………….
... Manual operation tool, (5) ... Friction type holding means, (6) ...
Actuator, (8A), (8B), (8), (a),
(B) ... automatic linkage mechanism, (10) ... load detection means,
(11) Control means.

Claims (1)

(57) [Claims] 1. An adjusting operation section (2) of an output adjusting means (1) of an engine (E) is provided so as to be urged to return to a low output side, and a manual linking mechanism is provided on the adjusting operation section (2). (3) An artificial operation tool (4) is linked so as to be operable in an interlocked manner, and a position is maintained in the manual linkage mechanism (3) in a set output state by the artificial operation tool (4). An engine output control device for a work vehicle provided with a holding means (5), wherein the manual linking mechanism (3) performs the adjusting operation regardless of a holding state by the friction type holding means (5). The adjustment operation unit (2) is provided in a state provided with flexibility to allow movement of the unit (2) to the output increasing side, and the artificial operation tool (4) is provided.
Automatic linkage mechanism (8A) with flexibility to allow the operation of
(8B), (8), (a), and an actuator (6) operably linked via (b) to operate the adjustment operation section (2) on the output increasing side from the set output state. A load detecting means (10) for detecting a load state of the engine (E); and, based on information from the load detecting means (10), the load of the engine (E) increases as the load becomes larger than a set value. Control means (1) for automatically operating the actuator (6)
1) An engine output control device for a work vehicle provided with.