JP4502497B2 - Engine idling rotation control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an idling rotation control device for an engine with an idle-up mechanism for increasing an alternator power generation amount.
[0002]
[Prior art]
An engine used as a driving power source for a work vehicle such as a mobile crane is provided with an alternator as an auxiliary machine for generating electricity necessary for the work vehicle. Furthermore, a battery is mounted on the work vehicle, and the electricity generated by the alternator is stored. Various electric equipment such as a lighting device, a safety device, and an operation device is mounted on the work vehicle, and electricity is supplied from the power supply device including the alternator and the battery as a power source of the electric equipment. .
[0003]
The power generation amount of the alternator has a characteristic that increases or decreases depending on the engine speed, and is the lowest power generation amount when the engine is idling. On the other hand, the power consumption of the electrical equipment of the work vehicle has the property of greatly increasing or decreasing depending on the working state of the work vehicle at that time. For this reason, for example, if a large number of lighting devices are turned on at night and the operation is continued while the engine is idling, the power consumption of the electrical equipment exceeds the amount of power generated by the alternator. There is a fear. As a countermeasure, an idle-up mechanism is installed that automatically increases the idling speed of the engine when the battery voltage drops below a predetermined voltage.
[0004]
Also, hydraulic oil discharged from a hydraulic pump driven by the engine is supplied to a hydraulic actuator such as a boom hoisting cylinder, a telescopic cylinder, or a turning motor equipped on a work vehicle such as a mobile crane. The operating speed is increased or decreased depending on the engine speed.
[0005]
[Problems to be solved by the invention]
However, in the work vehicle, the idle-up mechanism may operate during operation of the actuator by engine idling rotation. At that time, as described above, the idling speed of the engine automatically increases by a predetermined speed, so that the operating speed of the actuator is increased accordingly. In this case, the speed of the actuator suddenly increases against the driver's will, which may lead to a dangerous state. In particular, in the state where the actuator is operated by idling rotation, there is often a need for careful work at low speed, and there has been a desire to improve this phenomenon.
[0006]
Therefore, the present invention is to provide an engine idling rotation control device that solves the above problem while having an engine having an idle-up mechanism and an actuator that is driven by the engine and whose operating speed depends on the engine speed. To do.
[0007]
[Means for Solving the Problems]
An engine idling rotation control device according to claim 1 of the present application includes an engine with an idle-up mechanism for increasing an alternator power generation amount, an actuator that is driven by the engine and whose operating speed depends on the engine speed, and an operating means for the actuator An operation detecting means for detecting an operation by the engine and a controller for controlling the engine. The controller regulates the operation of the idle-up mechanism for the engine while receiving an operation detection signal of the operation detecting means. It is characterized by doing.
[0008]
With this configuration, the operation of the idle-up mechanism is restricted while the operation detection means is receiving the operation detection signal, that is, while the actuator is being operated. Therefore, a sudden increase in speed due to the idle-up of the actuator can be avoided. It can be done.
[0009]
The engine idling rotation control apparatus according to claim 2 of the present application is characterized in that the engine according to claim 1 is an engine having an electronic governor capable of electrically changing the engine speed.
[0010]
With this configuration, the control can be easily performed electrically when the operation of the idle-up mechanism during the operation of the actuator is restricted.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a block diagram of an engine idling rotation control apparatus according to an embodiment of the present invention.
[0012]
An engine 1 includes an electronic governor 2 that can electrically change the engine speed. The engine 1 includes an alternator 3 as an auxiliary machine, and generates electric power using a part of the engine rotational power. The electricity generated by the alternator 3 is charged to the battery 4 and supplied to electrical components such as a lighting device and a control device of a work vehicle on which the engine 1 is mounted. A voltage sensor 5 detects a terminal voltage of the battery 4 and outputs a voltage signal to the controller 6. The controller 6 is configured to send an engine speed signal to the electronic governor 2, and the engine 1 rotates at a speed corresponding to the engine speed signal output from the controller 6.
[0013]
Reference numeral 7 denotes a load operation switch, which is operated in conjunction with an operation of an electrical component having a particularly large power consumption among the above-described electrical devices. An operation signal of the load operation switch 7 is output to the controller 6. Reference numeral 8 denotes an idle volume which outputs to the controller 6 an idling rotational speed signal that continuously changes according to the operation of the idle volume. Reference numeral 11 denotes an accelerator operating means that detects an operation amount of the accelerator pedal 12 and outputs an accelerator operation signal to the controller 6.
[0014]
Reference numeral 13 denotes a hydraulic pump driven by the engine 1, and hydraulic oil discharged from the hydraulic pump 13 is sent to the actuator 15 via the pilot type switching valve 14. Therefore, when the switching amount of the pilot type switching valve 14 is constant, the operating speed of the actuator 15 depends on the amount of oil discharged from the hydraulic pump 13, that is, the rotational speed of the engine 1.
[0015]
Reference numeral 16 denotes an operation lever of the actuator 15 for operating the pilot valve 17. The pilot valve 17 and the pilot type switching valve 14 are connected via pilot oil passages 18 and 19 so that the pilot type switching valve 14 can be switched by the operation lever 16.
[0016]
20 and 21 are pressure sensors for the pilot oil passages 18 and 19, which correspond to the operation detecting means described in claim 1. Detection signals from the pressure sensors 20 and 21 are output to the controller 6.
[0017]
The operation of the idling rotation control device configured as described above is as follows.
(When the control lever is neutral)
When the operation lever 16 is in the neutral state, the detection signals from the pressure sensors 20 and 21 are not output to the controller 6, so that the controller 6 does not restrict the operation of the idle-up mechanism described below.
[0018]
If the terminal voltage of the battery 4 decreases due to an increase in power consumption by the electrical equipment while the engine 1 is idling, the controller 6 to which the signal of the voltage sensor 5 is output sends an idle up signal so as to increase the predetermined rotational speed. Output to the electronic governor 2. As a result, the idling speed of the engine 1 increases, and the amount of power generated by the alternator 3 increases. Alternatively, the controller 6 also outputs an idle up signal to the electronic governor 2 by outputting an operation signal of the load operation switch 7 to the controller 6. In this case, it is expected that the terminal voltage of the battery 5 is reduced when the electric component having a large power consumption consumes electricity, so the idling speed is increased in advance. Since the electronic governor 2 capable of electrically changing the engine speed is used, it is possible to easily change the idling speed only by outputting an idle up signal from the controller 6 to the electronic governor 2. Yes.
[0019]
As described above, the idle-up function operates, but the operating lever 16 is in a neutral state and the actuator 15 is stopped. Therefore, even if the idling speed is increased, there is no problem for the actuator 15.
[0020]
Note that the idling speed can be adjusted by the idle volume 8, and it is also possible to maintain a high idling state that is higher than the normal idling speed. When the accelerator pedal 12 is depressed, an accelerator signal corresponding to the amount of depression is output from the accelerator operating means 11 to the controller 6, and an engine speed signal corresponding to the accelerator signal is output from the controller 6 to the electronic governor 2. Therefore, the engine 1 is rotated at a rotation speed corresponding to the depression amount of the accelerator pedal 12.
(When operating the control lever)
When the operation lever 16 is operated, detection signals from the pressure sensors 20 and 21 are output to the controller 6, and the controller 6 regulates the operation of the idle-up mechanism described above.
[0021]
That is, even if the terminal voltage of the battery 4 falls below a predetermined voltage while the engine 1 is idling, the controller 6 to which the signal of the voltage sensor 5 is output outputs an idle up signal so as to increase the predetermined rotational speed. Does not output to electronic governor 2. Further, even when an operation signal of the load operation switch 7 is output to the controller 6, the controller 6 does not output an idle up signal to the electronic governor 2. For this reason, the operating actuator 15 is not suddenly increased by idle-up.
[0022]
When the terminal voltage of the battery 4 drops below a predetermined voltage during operation of the operation lever 16, the idle lever signal is output from the controller 6 to the electronic governor 2 after the operation lever 16 is returned to neutral. ing. Normally, in a work vehicle such as a mobile crane, the waiting time during which the actuator is stopped without being operated is much longer than the time during which the actuator is operated while the engine is rotating. Even if the above control is applied, the battery terminal voltage decreases, and there is no possibility of causing the battery to run out.
[0023]
FIG. 2 is a flowchart illustrating the function of the controller 6 according to the embodiment of the present invention. Control is started in STEP 1 and the engine is started in STEP 2. In STEP 3, signals are input from various sensors to the controller. In STEP 4, the presence / absence of an actuator operation signal is determined. That is, it is determined whether or not there is a detection signal from the pressure sensors 20 and 21 shown in FIG. When the actuator operation signal is input, the process returns to STEP 3 and the idle up control is not entered. When no operation signal is input, the voltage signal of the battery voltage sensor 5 is compared with a predetermined voltage value Ve in STEP5. When the battery terminal voltage is lower than the predetermined value, the process goes to step 6 and an idle up signal is output from the controller 6 to the electronic governor 2. If the battery voltage is not lower than the predetermined value, it is determined in STEP 7 whether there is a heavy load. That is, when an operation signal is input from the load operation switch 7, STEP 6 is selected, and an idle up signal is output from the controller 6 to the electronic governor 2. When the operation signal from the load operation switch 7 is not input, the output of the idle up signal output from the controller 6 to the electronic governor 2 in STEP 8 is cancelled. In STEP 9, it is determined whether or not the engine is stopped. If the engine is not stopped, the process returns to STEP 3 and the control is continued. When the engine is stopped, the idling control is finished.
[0024]
【The invention's effect】
Since it is configured and operates as described above, in the invention of claim 1 of the present application, the operation of the idle-up mechanism is restricted while the actuator is being operated, so a sudden increase in the speed of the actuator due to the idle-up is avoided. It can be done. Therefore, there is no fear that a dangerous state will be caused by a sudden increase in the speed of the actuator against the intention of the driver.
[0025]
Further, when the operation of the actuator is stopped, the idle-up mechanism can be operated and the battery is charged, so that the battery does not run up.
[0026]
Furthermore, in the invention of claim 2 of the present application, an electronic governor that can electrically change the engine speed is part of the configuration of the idle-up mechanism. Therefore, when the operation of the idle-up mechanism during operation of the actuator is regulated, This control can be easily performed.
[Brief description of the drawings]
FIG. 1 is a block diagram of an engine idling rotation control apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating functions of a controller according to the embodiment of the present invention.
[Explanation of symbols]
1 engine, 2 electronic governor, 3 alternator, 4 battery, 5 voltage sensor, 6 controller, 7 load operation switch, 8 idle volume, 11 accelerator operation means, 12 accelerator pedal, 13 hydraulic pump, 14 pilot type switching valve, 15 actuator , 16 Operation lever, 17 Pilot valve, 18 19 Pilot oil passage, 20 21 Pressure sensor

Claims (2)

An engine with an idle-up mechanism for increasing the amount of power generated by an alternator, an actuator driven by the engine whose operating speed depends on the engine speed, an operation detecting means for detecting an operation by the operating means of the actuator, and the engine A controller to control,
The engine idling rotation control device, wherein the controller regulates the operation of the idle-up mechanism for the engine while receiving an operation detection signal of the operation detection means. In the engine idling rotation control device according to claim 1,
The engine idling rotation control apparatus according to claim 1, wherein the engine is an engine having an electronic governor capable of electrically changing an engine speed.

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