Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1987-11-24
1989-06-06
Miller, Carl Stuart
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
123385, 414699, F02M 3900
Patent
active
048361658
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for controlling an engine mounted on a wheeled type construction machine and more particularly to an apparatus for controlling an output torque of the engine in accordance with a plurality of torque characteristics.
BACKGROUND ART
With respect to an engine mounted on a wheeled type construction machine, a high torque is required at a time of working and a high rotational speed is required at a time of moving.
However, when a rated output of the engine is taken into account, it is difficult to set an engine torque performance which can meet each of the aforesaid requirements. Heretofore, the aforesaid torque performance is established on the base of a compromise between the aforesaid requirements. For this reason, sufficient working performance and moving performance can not be given to the construction machine.
Incidentally, since an engine output is determined by torque and rotational speed of the engine, it follows that the aforesaid torque performance determines an engine output performance.
An object of the present invention is to provide an engine controlling apparatus which can impart sufficient working performance and moving performance to a wheeled type construction machine.
DISCLOSURE OF THE INVENTION
An engine controlling apparatus according to the present invention includes torque performance setting means for establishing first and second torque performances conformable to a time of working and a time of moving of a wheeled type construction machine as engine torque performance, discriminating means for discriminating whether the aforesaid wheeled type construction machine is kept in a working state or in a moving state, and controlling means for controlling the engine in accordance with the first torque performance when it is discriminated that the construction machine is kept in a working state and controlling the engine in accordance with the second torque performance when it is discriminated that the construction machine is kept in a moving state.
Since the engine controlling apparatus of the invention is constructed in the above-described manner, the first torque performance conformable to working and the second torque performance conformable to moving are set when a wheeled type construction machine carries out working and moving.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram illustrating an engine controlling apparatus in accordance with an embodiment of the present invention.
FIG. 2 is a block diagram illustrating an example of construction of a discriminating circuit.
FIG. 3 is a graph for the purpose of explaining a function of a target injection volume calculating circuit.
FIG. 4 is a graph for the purpose of explaining a function of a maximum injection volume calculating circuit.
FIG. 5 is a graph illustrating other example of setting a torque performance.
BEST MODE FOR CARRYING OUT THE INVENTION
Now, the present invention will be described in a greater detail hereunder with reference to the accompanying drawings.
FIG. 1 illustrates by way of a block diagram an engine control apparatus for a wheeled type construction machine in accordance with an embodiment of the present invention.
In the drawing an acceleration pedal position detecting sensor 2 outputs a signal corresponding to the position of depressing of an acceleration pedal 1 (an amount of actuation), that is, a signal representative of a target engine rotational speed.
A target injection volume calculating circuit 3 calculates a target injection volume with reference to a signal indicative of a target engine rotational speed transmitted from the acceleration pedal position detecting sensor 2 and a rotational speed signal indicative of an actual rotational speed of the engine transmitted from an engine rotational speed sensor 4, and outputs a signal indicative of the target injection volume.
Namely, this target injection volume calculating circuit 3 stores a plurality of regulation lines l.sub.1, l.sub.2,--as shown in FIG. 3 in a memory w
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Kubota Yasuhiko
Tate Shigeyuki
Kabushiki Kaisha Komatsu Seisakusho
Miller Carl Stuart
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