JP4123964B2 - Engine control device for construction machinery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine control device for a construction machine having a function of automatically stopping (auto-stopping) an engine in order to save fuel, reduce exhaust gas, and reduce noise when not working.
[0002]
[Prior art]
Conventionally, in a shovel or crane, when a preset auto-stop condition (for example, the gate lever that opens and closes the operator's entrance / exit is opened = the operator goes out of the machine), A technique for automatically stopping the operation is known (see, for example, Patent Document 1).
[0003]
Such an auto-stop function works in principle when not working, but there are situations in the actual site where auto-stop control is not desired even when not working.
[0004]
For example, when working at night, the machine itself does not work, but you do not want to stop the engine because you want to use the work light installed on the machine as field lighting, or do not work during the waiting time in summer or winter However, cooling and heating are when you want to keep driving .
[0005]
As a countermeasure for these points, it provided the selection switch for switching enabling / disabling of the automatic stop control by the operation of the operator, considered that the automatic stop control as described above to disable the automatic stop control in a situation where not want to act It is done.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-41069
[Problems to be solved by the invention]
However, when the selection switch is used, there is the hassle of having to operate the selection switch both when it is disabled and when it is enabled. This is inconvenient.
[0008]
The present invention solves the above problem, the engine is in not want exercising automatic stop control like situations be started, there is provided an engine control system for a construction machine which can automatically disable the automatic stop control.
[0009]
[Means for Solving the Problems]
The invention of claim 1 includes an engine as a power source, an engine switch for starting / stopping the engine, and an engine for performing auto-stop control for automatically stopping the engine when a preset auto-stop condition is satisfied. A control means and a signal output means, wherein the engine control means invalidates the auto stop control when starting the engine, and invalidates the auto stop control when an invalidity cancellation signal is output from the signal output means. The signal output means is configured to output an invalid cancellation signal when the gate lever that opens and closes the entrance / exit of the operator is first closed after the engine is started. .
[0010]
According to a second aspect of the present invention, there is provided an engine as a power source, an engine switch for starting / stopping the engine, and an engine for performing auto-stop control for automatically stopping the engine when a preset auto-stop condition is satisfied. A control means and a signal output means, wherein the engine control means invalidates the auto stop control when starting the engine, and invalidates the auto stop control when an invalidity cancellation signal is output from the signal output means. The signal output means is configured to cancel the operation when a specified operation is performed such that a predetermined operation body is operated first after the engine is started among the plurality of operation bodies that command the operation of the plurality of actuators. It is configured to output an invalidity cancellation signal.
[0011]
According to a third aspect of the present invention, there is provided an engine as a power source, an engine switch for starting / stopping the engine, and an engine for performing auto-stop control for automatically stopping the engine when a preset auto-stop condition is satisfied. A control means and a signal output means, wherein the engine control means invalidates the auto stop control when starting the engine, and invalidates the auto stop control when an invalidity cancellation signal is output from the signal output means. The signal output means outputs an invalid release signal when a specified operation is performed such that the operating body that commands the operation of the actuator is first operated in a predetermined pattern after the engine is started. It is comprised as follows.
[0012]
According to a fourth aspect of the present invention, in the configuration of the second or third aspect, the excavator is driven by an actuator to perform excavation work. Is configured to output an invalidity cancellation signal when the operation is performed.
[0013]
According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, when the timer is provided, and the engine control means has passed a preset time in a state where no invalidation cancellation signal is output from the signal output means The automatic stop control is canceled based on the signal from the timer .
[0014]
According to the configuration of the 請 Motomeko 1 to 5, because at the time the engine is started (when only multiplied by the engine) to automatically disable the auto-stop control, at night the work site, the machine itself is not working, the machine It is possible to respond to situations where you do not want to use auto-stop control, such as when you are using the installed work light as on-site lighting, or when you do not work but keep cooling and heating during the waiting time in summer and winter .
[0015]
Then, when actually entering the work, that is, when the gate lever closing operation, which is an essential operation before performing the work in claim 1, is performed first, the designated operations on the plurality of operating bodies are claimed in claims 2 to 4. Since the automatic stop control is switched to valid when the first operation of the body or the first specified pattern operation (specified operation) of the operation body is performed, it is possible to reliably prepare the automatic stop control to work as the work starts.
[0016]
In addition, switching from invalid to valid is also automatically performed (no special operation is required), so there is no troublesome operation and forgetting to return compared to a system in which the manual switch is switched effectively.
[0017]
Moreover, according to the structure of Claims 2-4, the objective of confirming a work start more strictly and invalidating an auto stop control can be achieved to the maximum.
[0018]
By the way, when taking the configuration to cancel the invalidation of the auto stop control after waiting for the auto stop valid condition to be satisfied, the engine operation is wasted when the operator gets off without performing any operation after starting the engine. It becomes.
[0019]
In this regard, according to the configuration of claim 5, even when the auto-stop effective condition is not satisfied, the auto-stop control becomes effective after the set time has elapsed, so that useless engine operation can be avoided .
[0020]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0021]
In the following embodiments, an excavator constituted by mounting an upper swing body on a lower traveling body and mounting an excavator comprising a boom, an arm, a bucket and a hydraulic cylinder driving these on the upper swing body is an object of application. As an example.
[0022]
First embodiment (see FIGS. 1 and 2)
In FIG. 1, an engine 1 as a power source is started by a cell motor 2 and the number of rotations / stop is controlled by a governor control unit 3.
[0023]
Reference numeral 4 denotes a hydraulic pump that is rotationally driven by the engine 1. The oil discharged from the hydraulic pump 4 drives an actuator circuit 5 for each hydraulic actuator of a boom cylinder, an arm cylinder, a bucket cylinder, a swing motor, and a traveling motor (not shown). And is supplied to each of the hydraulic actuators via a control valve that is switch-controlled by operation of an operation lever (not shown here) that is an operation body.
[0024]
The controller 6 that controls the operation of the engine 1 includes an engine control unit 7 as engine control means, a cell motor control unit 8 that controls the operation of the cell motor 2, and an auto-stop necessity determining unit 9.
[0025]
A signal relating to a preset auto-stop condition is input to the auto-stop necessity determining unit 9, and it is determined whether or not to perform auto-stop control based on the auto-stop condition signal.
[0026]
In addition, as an auto stop condition, for example,
(I) The gate lever 10 that opens and closes the entrance / exit of the operator is opened as shown by the solid line in FIG.
(Ii) Either one or both of the operation lever has not been operated or the non-operation state has been maintained for a certain period of time has been detected by a switch or the like. A signal for instructing the engine control unit 7 to start auto stop control is sent from the determination unit 9.
[0027]
In FIG. 1, reference numeral 11 denotes a limit switch as a signal output means that is turned on when the gate lever 10 is opened. In this embodiment, as will be described later, the signal from the limit switch 11 enables the auto stop control from being disabled to being effective. Used as an invalidity cancellation signal for switching.
[0028]
An engine switch 12 controls the start / stop of the engine 1 and the on / off of the power supply. As is well known, an OFF position where the power is turned off and the engine is stopped, an ON position where the power is turned on, and the engine 1 are started. The engine command signal is sent to the cell motor control unit 8 via the engine control unit 7 when the engine switch 12 is operated to the START position.
[0029]
As a result, the cell motor 2 rotates and the engine 1 is started. After the engine is started, invalidity / validity of the automatic stop control is automatically selected.
[0030]
The operation of this point will be described with reference to the flowchart of FIG.
[0031]
First, in step S1, it is determined whether or not an engine start operation has been performed based on a signal from the engine switch 12. If YES, a start command for the engine 1 is output (step S2).
[0032]
The auto stop control is automatically set to be invalidated together with the engine start operation (step S3), and the auto stop control is not performed even if the auto stop condition is satisfied until it becomes valid in step S5.
[0033]
Thus, after the engine is started, the engine 1 is operated in a state where the automatic stop control does not work.
(B) At the night work site, the machine itself can be used without working, and the work light installed in the machine can be used as site lighting.
[0034]
(B) During the waiting time in summer and winter, cooling and heating can continue to be operated, although no work is performed.
[0035]
However, in this state, since the auto stop control does not work when the work is started after that, the purpose of the control is lost.
[0036]
Therefore, when the gate lever closing operation that is always performed before the operator enters the aircraft and starts work is first detected (when a signal from the limit switch 11 is input = YES in step S4), a step is performed. In S5, the automatic stop control is automatically switched to the effective state.
[0037]
Then, when the engine is stopped by the engine switch 12 (YES in step S6), the engine 1 is stopped in step S7.
[0038]
Thus, after the engine is started, the auto stop control is automatically disabled until the operator performs the gate lever closing operation, which is an intentional operation to actually start work. Can respond to the request not to stop.
[0039]
Moreover, since both invalid setting and switching from invalid to valid are automatically performed as described above, there is no inconvenience of operation as in the case of switching with a manual switch, and there is no fear of forgetting operation and forgetting to return.
[0040]
Since the automatic stop control is switched to the effective state when the gate lever closing operation, which is an essential operation before the work is first detected, it is possible to reliably prepare the automatic stop control to work when the work starts.
[0041]
As shown in FIG. 1, a release switch 13 is provided. When the release switch 13 is operated, the automatic disable setting function of the automatic stop control is canceled, and the automatic stop control is enabled immediately after the engine is started.
[0042]
Second embodiment (see FIGS. 3 and 4)
Only differences from the first embodiment will be described.
[0043]
As shown in FIG. 3, the shovel has a boom lever 14 for raising and lowering a boom, an arm lever 15 for operating an arm, a bucket lever 16 for operating a bucket, and a traveling for traveling operation. A lever 17 and a turning lever 18 for turning operation are provided. By operating these levers, operation signals (boom operation signal, arm operation signal, bucket operation signal, travel operation signal, turning operation signal) corresponding to the operation amount are provided. It is output from each converter 19 ... and sent to each control valve via a controller for actuator control (not shown).
[0044]
In the second embodiment, among the operation signals from the converters 19..., The boom operation signal, the arm operation signal, and the bucket operation signal output during excavation work are taken into the engine control unit 7 together with the gate lever closing operation signal, This is configured to be used as an invalidity cancellation signal.
[0045]
That is, as shown in FIG. 4, after the start operation of the engine 1 is performed in steps S11 and S12 and the engine 1 is started, and the auto stop control is disabled in step S13, the first gate lever closing signal is set. When the first operation signal of at least one of the boom, arm, and bucket is input (YES in step S14), it is assumed that the condition for switching to auto stop control is satisfied, and auto stop control is enabled in step S15. Switch.
[0046]
In addition, after this, when the engine stop operation is performed in steps S16 and S17, the point that the engine 1 stops is the same as steps S6 and S7 of the first embodiment (FIG. 2).
[0047]
As described above, since the automatic stop control is effectively switched only by a combination of two kinds of operations (gate lever closing and excavation operation lever operation), a single work intention operation (gate lever closing operation) is performed as in the first embodiment. ), It can be confirmed more accurately that the work is started, compared with the case where only the switching is performed.
[0048]
In particular, among these operations, since at least one of boom operation, arm operation, and bucket operation related to excavation work that is the main work of the excavator is performed (at the time of designated operation), it is determined that the work starts. It becomes.
[0049]
Further, since the turning and traveling operations are not used for the effective switching judgment base, for example, the turning function and the traveling movement function of the machine required when using the machine as a lighting tower can be utilized.
[0050]
By the way, as a variation of the designation operation in the second embodiment,
(I) The operation amount of any one of the boom operation, the arm operation, and the bucket operation is greater than or equal to a predetermined value;
(Ii) One or more of the three operations described above may be performed as a condition for switching to the automatic stop control enabled state in a pattern designated in advance (for example, simultaneous pulling operation of the arm and the boom). .
[0051]
When the above conditions (i) and (ii) are employed, the automatic stop control is effectively switched when the work start becomes more realistic, so that the invalid state of the control can be utilized immediately before the work.
[0052]
Further, when the condition (i) is adopted, it is possible to ensure a function of lightly operating the boom, arm, and bucket in order to assist the turning and traveling movement of the machine. For this reason, the freedom degree when using a machine for another use spreads.
[0053]
Reference form 1 (see FIGS. 5 and 6)
In the reference form 1 , as shown in FIG. 5, an engine speed sensor 20 for detecting the speed of the engine 1 is provided as a signal output means, and an engine operation signal from the sensor 20 (signal that the engine is operating). Is used as an invalidity cancellation signal.
[0054]
That is, as shown in FIG. 6, it is determined in step S21 whether or not the engine switch 12 is in the ON position. In the ON position, that is, when the engine switch 12 is operated but the engine 1 has not yet started, In step S22, the auto stop control is set to be invalid.
[0055]
Next, in step S23, it is determined whether or not the engine switch 12 is in the START position. If YES (START position), the cell motor 2 is driven in step S24.
[0056]
On the other hand, in the case of NO, it is determined whether or not the engine 1 is in operation based on the signal from the rotation speed sensor 20 in step S25, and when the engine is in operation, the condition for switching to the automatic stop control is satisfied. In step S26, the automatic stop control is effectively switched.
[0057]
Thereafter, as in the first and second embodiments, the engine 1 is stopped when the engine is stopped in steps S27 and S28.
[0058]
According to this configuration, even when the engine switch 12 is set to the ON position or turned to the START position, the automatic stop control remains invalid when the engine is not actually operated. Therefore, even if the engine switch 12 is turned on, the auto stop control does not work if the engine is not started for a while or if the engine 1 does not start easily during cold weather. For this reason, the troublesome reset operation of returning the engine 1 to the OFF position and restarting the engine 1 is eliminated.
[0059]
In addition, instead of the engine speed sensor 20 that directly detects the engine speed as described above, the signal output means that detects that the engine is operating and outputs the invalidity cancellation signal, as described above, means for indirectly detecting the engine operation, That is, a sensor that detects a power generation state (whether or not power is generated) of a generator (not shown) driven by the engine 1 or a pressure sensor that detects a discharge pressure of the hydraulic pump 4 may be used.
[0060]
Reference form 2 (See Figs. 7 and 8)
In a construction machine, there is a case where it is desired to leave the engine 1 for a certain period of time without performing work (for example, to keep auto-stop control disabled) for warming up after the engine is started.
[0061]
Therefore, in the second embodiment, in response to this request, as shown in FIG. 7, the engine control unit 7 is provided with a timer 21 as a signal output means, and the control shown in FIG. 8 is performed.
[0062]
That is, after the engine 1 is started in steps S31 and S32 and the automatic stop control is invalidated in step S33, a preset time (for example, 30 minutes) T1 has elapsed based on the signal from the timer 21 in step S34. Determine whether or not.
[0063]
Here, when the set time T1 has elapsed, the automatic stop control is validated in step S35, and if there is an engine stop operation, the engine 1 is automatically stopped (steps S36 and S37).
[0064]
By doing so, the engine operation is ensured within the set time T1, so that the engine 1 can be reliably warmed up.
[0065]
Third embodiment (see FIGS. 9 and 10)
As in both the first and second embodiments, when the auto-stop control condition indicating the start of work is satisfied, the invalidity of the auto-stop control is solved. After the engine is started, the operator does not perform any operation. If you get off at, useless engine operation will be performed.
[0066]
Therefore, in the third embodiment, as a solution to this problem, a timer 22 is provided in the engine control unit 7 as shown in FIG. 9 (an example based on the configuration of the second embodiment). The control shown in FIG. 10 is performed.
[0067]
That is, after the engine 1 is started in steps S41 and S42 and the automatic stop control is disabled in step S43, it is determined in step S44 whether or not the automatic stop valid condition is satisfied.
[0068]
If NO (not established), the timer 22 counts in step S45, and when a preset time (for example, 30 minutes) T2 has elapsed (YES in step S46), in step S47. Enable auto stop control.
[0069]
When YES is determined in the step S44, the process proceeds to a step S47 and the auto stop control is made effective even within the set time T2.
[0070]
Thereafter, the same determination as in each of the embodiments described above is performed (step S48) and the engine is stopped (step S49).
[0071]
In this way, even when the auto-stop effective condition is not satisfied, the auto-stop control becomes effective after the set time T2 has passed, so that useless engine operation can be avoided.
[0072]
【The invention's effect】
As described above, according to the first to fifth aspects of the invention, when the engine is started (when the engine is only started), the automatic stop control is automatically invalidated. For use when working lights installed on the machine are used as on-site lighting, or when you do not want to use auto-stop control during the summer and winter waiting periods, such as when you do not work but continue cooling and heating. be able to.
[0073]
Then, when actually entering the work, that is, when the gate lever closing operation, which is an essential operation before performing the work in claim 1, is performed first, the designated operations on the plurality of operating bodies are claimed in claims 2 to 4. Since the auto stop control is switched to valid when the first operation of the body or the first designated pattern operation (designated operation) of the operation body is performed, it is possible to reliably prepare the auto stop control to work as the work starts.
[0074]
In addition, since switching from invalid to valid is automatically performed (no special operation is required), there is no troublesome operation and forgetting to return as compared with a method of switching effectively by a manual switch return operation.
[0075]
Moreover, according to the invention of Claims 2-4, the objective of confirming a work start more strictly and invalidating an auto stop control can be achieved to the maximum extent.
[0076]
According to the fifth aspect of the present invention, even when the auto stop valid condition is not satisfied, the auto stop control becomes effective after the set time has elapsed, and therefore, wasteful engine operation can be avoided .
[Brief description of the drawings]
FIG. 1 is a block configuration diagram showing a first embodiment of the present invention.
FIG. 2 is a flowchart for explaining the operation of the embodiment.
FIG. 3 is a block diagram showing a second embodiment of the present invention.
FIG. 4 is a flowchart for explaining the operation of the embodiment.
FIG. 5 is a block diagram showing a first embodiment of the present invention.
FIG. 6 is a flowchart for explaining the operation of the reference embodiment.
FIG. 7 is a block diagram showing a second embodiment of the present invention.
FIG. 8 is a flowchart for explaining the operation of the reference embodiment.
FIG. 9 is a block diagram showing a third embodiment of the present invention.
FIG. 10 is a flowchart for explaining the operation of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine 2 Cell motor for engine start 3 Governor control part for engine control 7 Engine control part as engine control means 8 Cell motor control part 9 Auto stop necessity judgment part 10 Gate lever 11 As signal output means operated by operation of the lever Limit switch 12 Engine switch 13 Release switch to cancel the function to automatically disable auto stop control control 14, 15, 16 Boom, arm and bucket operation levers (operating body)
19 A converter as a signal output means for converting the lever operation amount into a signal 20 An engine speed sensor as a signal output means 22 A timer

Claims (5)

  An engine as a power source, an engine switch for starting / stopping the engine, an engine control means for performing automatic stop control for automatically stopping the engine when a preset automatic stop condition is satisfied, and a signal output means The engine control means is configured to invalidate the auto stop control when starting the engine, and to cancel the invalidity of the auto stop control when an invalidity cancellation signal is output from the signal output means, The engine output of the construction machine is characterized in that the signal output means is configured to output an invalid release signal when the gate lever that opens and closes the entrance / exit of the operator is first closed after the engine is started. apparatus.   An engine as a power source, an engine switch for starting / stopping the engine, an engine control means for performing automatic stop control for automatically stopping the engine when a preset automatic stop condition is satisfied, and a signal output means The engine control means is configured to invalidate the auto stop control when starting the engine, and to cancel the invalidity of the auto stop control when an invalidity cancellation signal is output from the signal output means, The signal output means outputs an invalidity cancellation signal when a specified operation is performed such that a predetermined operation body is operated first after the engine is started among a plurality of operation bodies that command the operation of the plurality of actuators. An engine control device for a construction machine, characterized in that it is configured as described above.   An engine as a power source, an engine switch for starting / stopping the engine, an engine control means for performing automatic stop control for automatically stopping the engine when a preset automatic stop condition is satisfied, and a signal output means The engine control means is configured to invalidate the auto stop control when starting the engine, and to cancel the invalidity of the auto stop control when an invalidity cancellation signal is output from the signal output means, The signal output means is configured to output an invalidity cancellation signal when a specified operation is performed such that the operating body that commands the operation of the actuator is first operated in a pattern specified in advance after the engine starts. An engine control device for a construction machine.   The excavator is driven by an actuator to perform excavation work, and the signal output means is configured to output an invalidity cancellation signal when a designated operation is performed on the operating body that commands the operation of the excavator actuator. The engine control device for a construction machine according to claim 2 or 3, A timer is provided, and the engine control means is configured to cancel the invalidation of the auto stop control based on the signal from the timer when a preset time has elapsed without the invalidity cancellation signal being output from the signal output means. The engine control device for a construction machine according to any one of claims 1 to 4, wherein the engine control device is for a construction machine .

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