JP4089270B2 - Construction machine and engine control method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a construction machine and an engine control method for the construction machine that automatically stops the engine in order to save fuel, exhaust, reduce noise and the like when not working.
[0002]
[Prior art]
  Conventionally, as this kind of technology in excavators and cranes,
  (A) Technology that automatically stops the engine when the gate lever that opens and closes the cabin entrance is opened based on the signal of the switch that is actuated (= not working) No. 2001-41069),
  (B) Technology for automatically stopping the engine when it is not in operation when a lock lever that locks the hydraulic circuit is operated (Japanese Patent Laid-Open No. 2000-96627)
  Is known.
[0003]
[Problems to be solved by the invention]
  However, according to the above-mentioned known technique (a), the gate lever is just opened, and according to the known technique (b), the lock lever is operated, and the engine is stopped as if the operation is stopped. The engine sometimes stopped against the operator's will.
[0004]
  That is, in the case of the known technique (A), the engine stops immediately even when the operator gets off the vehicle temporarily for a short period of time for addition or a meeting while having the intention of continuing the work.
[0005]
  In the case of (b) known technology, for example, the operator temporarily operates the lock lever so that the hydraulic actuator does not move while giving an operation instruction or signal from inside the cabin to the outside or checking the work content. Even if you do, the engine stops.
[0006]
  In this case, the engine must be restarted each time, and the operation is troublesome.
[0007]
  On the other hand, according to the above known technique, the engine is automatically stopped under a specific condition, but the power source remains connected. Therefore, there is a problem that the battery is overdischarged in a construction machine using the battery as a power source.
[0008]
  Therefore, the present invention provides a construction machine capable of automatically stopping an engine only when an operator does not intend to continue work, and an engine control method thereof.
[0009]
  The present invention also provides a construction machine that can shut off the power source when the engine is stopped to prevent overdischarge.
[0010]
[Means for Solving the Problems]
  The invention according to claim 1 (engine control method for a construction machine) is a construction machine in which a hydraulic pump is operated using an engine as a power source, and a hydraulic actuator is driven by discharged oil of the hydraulic pump based on an operation of an operating means. After the operation of the operation means is lost, a preset grace time has elapsed, andAt the end of this grace periodThe operatorUnder the condition of getting offThe engine is automatically stopped by the control means.
[0011]
  According to a second aspect of the present invention (construction machine), in a construction machine in which a hydraulic pump is operated using an engine as a power source and a hydraulic actuator is driven by discharged oil of the hydraulic pump based on an operation of an operation means. There are provided a boarding / alighting state detecting means for detecting, an operating state detecting means for detecting whether or not the operating means is operating, and a control means. After detecting an operation, a preset grace time has elapsed, andAt the end of this grace periodThe above-mentioned getting-on / off state detecting means detects the operator getting off.Under the conditionsThe engine is configured to automatically stop.
[0012]
  According to a third aspect of the present invention, in the configuration of the second aspect, the control means is configured to reduce the engine speed to a preset standby speed during the grace period.
[0013]
  According to a fourth aspect of the present invention, in the configuration of the second or third aspect, a gate lever switch that is operated by a gate lever that opens and closes the entrance / exit is used as the getting-on / off state detecting means, and the control means is provided when the gate lever opens. The gate lever switch signal determines that the operator is getting off the vehicle.
[0014]
  According to a fifth aspect of the present invention, in any one of the second to fourth aspects, an illumination lamp is provided, and the control means is configured not to stop the engine when the illumination lamp is in a lighting state. .
[0015]
  According to a sixth aspect of the present invention, in any one of the second to fifth aspects, the control means is configured to predict the engine stop to the operator before the engine is stopped.
[0016]
  According to a seventh aspect of the present invention, in the configuration according to any one of the second to sixth aspects, the control means performs an engine restart method on the operator when the boarding / alighting state detecting means detects the boarding of the operator after the engine is stopped. It is configured to guide.
[0017]
  According to an eighth aspect of the present invention, in the configuration according to any one of the second to seventh aspects, when the key switch for starting the engine is operated from the on position to another position after the engine is stopped, the control means And is configured to guide the restart method.
[0018]
  According to a ninth aspect of the present invention, in any one of the second to eighth aspects, the control means is an engine.TheStopAs well asThe power supply is configured to be cut off.
[0019]
  The invention of claim 10After the preset time has elapsed since the engine stopped, the control meansThe power supply is configured to be cut off.
[0020]
  The invention of claim 1111. The configuration according to claim 9, wherein the control means detects the boarding of the operator after the engine stops.WhenTo powerAre configured to connect.
[0021]
  The invention of claim 12 is the invention of claim 9.Or 10In the configuration, the control means is the engine stopLater, after the key switch for starting the engine was returned from the on position to the off position, it was operated to the on position.When you turn on the powerConnectionIt is comprised so that it may do.
[0022]
  The invention of claim 13 is claimed in claim2Any of 12TheIn the configuration, the control meansThere is provided a switching means for switching between the state in which it is operated and the state in which it is not operated.It has been.
[0023]
  Above structureAccording to the construction, after the operation of the operating means is lost, the grace time elapses and the operator gets off when the grace time elapses.ing(In claim 4, the gate lever is "open")Under the conditionsThe engine stops automatically.
[0024]
  Since these conditions are usually met only when the operator does not intend to continue work, there is no possibility that the engine will be stopped unnecessarily.
[0025]
  More specifically, the engine does not stop even if the operation is stopped while the operator gives an operation instruction or signal from the cabin to the outside or confirms the work content.
[0026]
  Further, even if the operator gets off temporarily for short-term addition or a meeting, the engine does not stop when he / she gets on again within the grace period.
[0027]
  Therefore, there is no possibility that the engine will stop against the will of the operator, and the trouble of restarting the engine each time is eliminated.
[0028]
  Further, by providing a grace period, it is possible to give the operator time to select the intention to continue / stop work.
[0029]
  According to the third aspect of the present invention, the engine is rotated at a low speed (standby speed) during the grace period, so that waste of engine fuel can be avoided.
[0030]
  On the other hand, according to the configuration of claim 5, when the inspection or repair work is performed with the illumination light turned on, the engine will not stop even if the above conditions are met. Discharge can be prevented.
[0031]
  According to the configuration of claim 6, in order to notify the operator of the fact before the engine is automatically stopped, the operator who wants to get off the vehicle confirms that the engine has stopped and finally selects whether to stop / continue the work. Can be avoided as much as possible.
[0032]
  According to the configuration of claim 7, when the operator gets on again after the engine is stopped, the operator is inexperienced with this system in order to guide the operator how to restart the engine (indicated by text display or voice display on the display). Even an operator can restart the engine quickly and smoothly.
[0033]
  Normally, when starting the engine, the key switch is turned from the off position to the start position via the on position, but the key switch is in the on position when the engine is automatically stopped.
[0034]
  Therefore, when restarting the engine that has been automatically stopped, the key switch in the ON position is temporarily returned to the OFF position and then turned to the start position via the ON position or the ON position in order to follow the same procedure as at the start. The operation to turn directly to the start position is performed.
[0035]
  According to the configuration of the eighth aspect, when the key switch is operated (operation from the on position to another position) after the engine is stopped, it is assumed that the operator intends to restart the engine. Therefore, even if the operator is unfamiliar, there is no hesitation in operation.
[0036]
  On the other hand, claims 9 to12According to the configuration of the engineTheStopAs well asSince the power supply is automatically shut off, it is possible to prevent wasteful discharge when the battery is used as the power supply and to stop the electric system to ensure safety..
[0037]
  MaClaim10With this configuration, since the power supply is shut off after a lapse of a certain time from the engine stop, it is possible to secure electrical processing (for example, memory processing in a machine equipped with a computer) to be performed together with the engine stop.
[0038]
  Claim 11According to this configuration, after the engine is stopped, the power is restored simply by getting on the operator, so that it is not necessary to take a troublesome procedure for restoring the power, and the operation burden on the operator is reduced.
[0039]
  ContractClaim12According to the configuration, after the engine is stopped, the power is restored after confirming the operator's intention to restart the engine, that is, the key switch is returned from the on position to the off position as described above. Therefore, there is no possibility that the power supply is restored in vain.
[0040]
  Claim13According to this configuration, automatic control such as engine stop and manual control can be selected according to the preference of the operator and the work environment (for example, when the engine automatic stop is not necessary).
[0041]
DETAILED DESCRIPTION OF THE INVENTION
  1st Embodiment (refer FIGS. 1-7)
  FIG. 1 shows the overall configuration of a control system such as an engine in this construction machine.
[0042]
  In the figure, reference numeral 1 denotes an engine. Both the main and auxiliary hydraulic pumps 2 and 3 are driven by the engine 1, the discharge oil of the main hydraulic pump 2 is supplied to the hydraulic actuator circuit 4, and the discharge oil of the auxiliary hydraulic pump 3 is operated to the operating means. Are respectively supplied to the remote control valves 5.
[0043]
  The remote control valve 5 has a lever 5a, and a control valve (not shown) in the hydraulic actuator circuit 4 is switched and operated by a remote control pressure (pilot pressure) corresponding to the operation direction and operation amount of the lever 5a. The operating direction and speed of a hydraulic actuator such as a hydraulic cylinder or a hydraulic motor are controlled.
[0044]
  A hydraulic lock valve (electromagnetic valve) 8 controlled by a controller 7 as control means is provided in a remote control valve primary side line 6 connecting the auxiliary hydraulic pump 3 and the remote control valve 5, and this hydraulic lock valve 8 is shown in the figure. The supply of pilot pressure oil to the remote control valve 5 is stopped when the open position a is switched to the right lock position b.
[0045]
  Thereby, even if the remote control valve 5 is operated, no remote control pressure is generated, so that the operation of the hydraulic actuator circuit 4 is stopped.
[0046]
  The controller 7 determines whether or not the remote control valve 5 has been operated mainly by signals from an engine control unit 9 that controls operation / stop and rotation speed of the engine 1 and pressure sensors 10 and 11 provided in the remote control valve 5 ( The operation state detection unit 12 for detecting the operation state) and the gate lever 13 provided at the cabin entrance are opened as shown by the broken line from the closed state of the solid line in the figure (when the operator gets off). A boarding / alighting state detection unit 15 that detects a boarding / alighting state by a signal from the gate lever switch 14, a notification control unit 18 that controls the display device 16 and the speaker 17 as a notification unit that performs prediction of engine stop and restart guidance, A power supply control unit 20 that controls on / off of the power switch 19, an illumination lamp control unit 22 that controls the illumination lamp 21, and a boarding / alighting state detection unit 15 Controlling the hydraulic lock valve 8 on the basis of al of the signal (switching the hydraulic lock valve 8 to the locked position B when the operator gets off) are provided with a hydraulic lock valve control unit 23.
[0047]
  Reference numeral 24 denotes a governor control section for setting the operation / stop and rotation speed of the engine 1 based on a signal from the engine control section 9 of the controller 7. Reference numeral 25 denotes a key switch for starting the engine. Reference numeral 26 denotes an engine for setting the engine rotation speed. A throttle 27 is an illumination lamp switch for turning on / off the illumination lamp 21, and 28 is a selection switch for selecting whether or not to perform the automatic control described below according to the operator's intention.
[0048]
  The operation of the construction machine including the contents of control by the controller 7 will be described with reference to FIGS.
[0049]
  A. Engine stop control
  FIG. 2 shows a flow of engine stop control. When the control is started, it is determined whether or not the remote control valve 5 is operated in the operation state detection unit 12 (step S1). If NO (in operation), the engine throttle 6 The engine 1 is operated at the set rotational speed by a signal from the engine control unit 9 to the governor control unit 24 based on the input from (step S2).
[0050]
  On the other hand, in the case of YES (no operation) in step S1, waiting for the elapse of a preset waiting time T1 (step S3), the standby in which the engine speed is set to be low in advance as the engine speed leading to engine stop. The rotation speed is set (step S4).
[0051]
  Thereafter, a preset grace time T2 is counted, and when the grace time T2 has elapsed (YES in step S5), whether or not the gate lever 13 is “open” in step S6, and the illuminating lamp in step S7. It is determined whether or not 21 is lit and whether or not the selection switch 28 is in the state of selecting automatic control in step S8. If all are YES, the engine is stopped by the display device 16 or the speaker 17 in step S9. (For example, “Automatically stop the engine”) is issued.
[0052]
  Note that if T2 elapses in step S5, the gate lever is “closed” in step S6, the illumination lamp is turned on in step S7, and the selection switch is turned off in step S8, the engine speed is maintained at the standby speed in step S10. The
[0053]
  Thereafter, the engine 1 automatically stops when the engine stop waiting time T3 set as necessary until the engine 1 actually stops from the engine stop prediction (YES in step S11) (step S12). .
[0054]
  Further, after the engine is stopped, a preset waiting time T4 is set (step S13), and the power is shut off (step S14).
[0055]
  The above operation is also shown in the timing charts of FIGS.
[0056]
  FIG. 4 shows a case where the gate lever 13 is opened (the operator gets off) before the grace time T2 in step S5 in FIG. 2 elapses after no operation is detected in step S1 in FIG. In this case, after the gate lever 13 is opened, the engine 1 is stopped after the grace time T2 and the engine stop waiting time T3 have elapsed.
[0057]
  On the other hand, FIG. 5 shows a case where the gate lever 13 is opened after the grace time T2 has elapsed after detecting no operation. In this case, since two conditions are not satisfied within the grace time T2, the grace time T2 has elapsed. Thereafter, the engine 1 does not stop, and thereafter, when the gate lever 13 is opened, the engine 1 stops only with the engine stop waiting time T3.
[0058]
  As described above, after the operation of the remote control valve 5 is lost, when the grace period T2 has elapsed and the operator gets off (gate lever 13 “open”), that is, when the operator's intention to stop the operation is clear. Only the engine 1 is automatically stopped.
[0059]
  Therefore, if the operator intends to continue the work, for example, the engine will not stop even if the operation is stopped while the operator gives the work instruction or signal from inside the cabin to the outside or confirms the work content. However, the engine 1 does not stop when it gets off again within the grace period T2 even if it gets off temporarily for a short period of time or a meeting.
[0060]
  For this reason, there is no possibility that the engine 1 will stop against the will of the operator, and the trouble of restarting the engine 1 each time is eliminated.
[0061]
  Further, by providing the grace time T2, it is possible to give the operator time to select the intention to continue / stop work.
[0062]
  Further, the following effects can be obtained.
[0063]
  (I) Since the engine 1 is rotated at a low speed (standby rotational speed) during the grace period T2 as shown in FIGS. 2 and 4, waste of engine fuel can be suppressed.
[0064]
  (Ii) When work such as inspection or repair is performed with the illumination lamp 21 turned on, the engine 1 will not stop even if the above two conditions are met, so that overdischarge of the battery is prevented when the battery is used as a power source. be able to.
[0065]
  (Iii) Since the operator is notified before the automatic stop of the engine 1, the operator who intends to get off can finally select the engine (work) stop / continuation to avoid useless engine stop. .
[0066]
  (Iv) Since the power supply is automatically shut off when the engine is stopped, the electrical system can also be stopped to ensure safety, and wasteful discharge when the battery is used as the power supply can be prevented.
[0067]
  In addition, since the power is shut off after a certain waiting time T4 has elapsed since the engine stopped, it is possible to ensure electrical processing (for example, memory processing in a machine equipped with a computer) to be performed together with the engine stopping.
[0068]
  B. Engine restart control
  FIG. 3 shows a control flow for engine restart. First, in step S15, it is determined whether or not the key switch 25 is in the ON position.
[0069]
  When the engine 1 is automatically stopped by the engine stop control, the key switch 25 is in the on position. After that, the key switch 25 is left in the on position, and the operator returns the key switch 25 to the off state and removes the key. There are cases.
[0070]
  Therefore, after the engine is stopped, in the case of YES in step S15, it is determined in step S16 whether the gate lever 13 is “open” or “closed”. In step S17, the restart method is guided to the operator by the display device 16 or the speaker 17 (for example, a character display or voice guidance of “the engine restarts when the key switch is started”).
[0071]
  Next, after the power is restored in step S18, it is determined in step S19 whether or not the key switch 25 has been started. When the start operation is performed, the engine 1 is restarted (step S20).
[0072]
  On the other hand, if NO in step S15, that is, if it is determined that the key switch 25 is not in the ON position, after the restart method is guided in the same manner as in step S17 in step S21, the key is followed in accordance with this guidance in step S22. It is determined whether or not the switch 25 is once returned to the off position. If YES (returned), a flag A = 1 indicating that the key switch 25 has been once returned to the off position is stored in step S23 and the step is performed. Return to S15.
[0073]
  In addition, also when it becomes NO (the key switch 25 is not turned off) by step S22, it returns to step S15 and repeats step S21 and step S22.
[0074]
  When the gate lever is opened in step S16, it is determined in step S24 whether or not flag A = 1, that is, whether or not the key switch 25 has been once returned to the OFF position. Assuming that the restarting operation is being performed with the lever 13 open, the power supply is connected (step S18), and the engine restarts (step S20).
[0075]
  On the other hand, if NO in step S24, it is determined that the operator has not operated the key switch, and the process returns to step S15.
[0076]
  On the other hand, if NO in step S19 (the key switch 25 is not started), it is determined in step S25 whether or not the key switch 25 is in the off position. If not, the process returns to step S19 and starts. Waiting for the operation, if it is in the off position, the process returns to step S15 to wait for the operation to the on position.
[0077]
  FIG. 6 is a timing chart of engine restart when the gate lever 13 is “closed” before the key switch 25. The power is restored by the “close” operation of the gate lever 13, and the key switch 25 is started. The engine 1 is rotated by the operation.
[0078]
  On the other hand, FIG. 7 shows the engine when the key switch 25 is operated before the “close” operation of the gate lever 13 (when the operator performs a restart operation before getting on and closing the gate lever 13). This is a restart timing chart. As described above, restart guidance is performed by turning on / off or starting the key switch 25, power is restored by turning off / on the key switch 25, and the key switch 25 is turned on. → The engine 1 restarts with the start operation.
[0079]
  As described above, after the engine is stopped, the power is restored only by getting on by the operator (steps S16 to S18). Therefore, it is not necessary to take a troublesome procedure for restoring the power, and the operation burden on the operator is reduced.
[0080]
  In addition, after confirming the operator's intention to restart the engine, the key switch 25 is returned from the ON position to the OFF position and then returned to the ON position by the flow of Step S15 → Steps S21 to S23 → Step S15. Since the power is restored, there is no possibility that the power is restored unnecessarily.
[0081]
  on the other hand,
  a. When the operator gets on (when “closed” in step S16),
  b. When the key switch 25 is operated from the ON position to another position (NO in step S15)
  In addition, since the engine restart method is guided to each operator, there is no hesitation in operation even if the operator is unfamiliar, and the engine 1 can be restarted quickly and smoothly.
[0082]
  Second and third embodiments (see FIGS. 8 and 9)
  In the first embodiment, the configuration is such that the engine 1 is automatically stopped and the power supply is shut off when the grace period T2 elapses from no operation and the gate lever 13 is "open". In the embodiment, as shown in FIG. 8, the engine 1 is automatically stopped only when the gate lever 13 is “open” (steps S101 and S102), and a waiting time T4 is set (step S103) to shut off the power supply. (Step S104).
[0083]
  In the third embodiment shown in FIG. 9, it is determined whether or not there is no operation in step S201 (step S202 if there is an operation), and when there is no operation, the engine speed is set after the waiting time T1 has elapsed. In addition, the engine 1 is automatically stopped (step S208) through the engine stop prediction (step S206) after the grace period T2 has elapsed (step S207 before the passage) in step S205. The power supply is shut off after the waiting time T4 has elapsed (step S211).
[0084]
  In both the second and third embodiments, as in the first embodiment, the power supply is shut off when the engine is stopped, so that overdischarge of the battery can be prevented in a machine using the battery as a power source, and the electric system is also used. The effect that the safety can be ensured by stopping is obtained.
[0085]
  Other embodiments
  (1) The grace time T2 when the engine is stopped may be adjusted to be longer or shorter for each machine according to the operator's preference, work environment, or the like.
[0086]
  Further, the engine speed may be maintained at the set speed without dropping to the standby speed during the grace period T2.
[0087]
  (2) In the above embodiment, the engine 1 is configured not to automatically stop when the illumination lamp 21 is lit. However, the engine 1 is configured to automatically stop even when the illumination lamp is lit. Also good.
[0088]
  The two patterns (whether or not to stop the engine while the illumination lamp is lit) may be arbitrarily selected by a changeover switch.
[0089]
  (3) As a boarding / alighting state detection means, instead of the method of indirectly detecting the boarding / alighting of the operator by opening / closing the gate lever 13 as described above, the boarding / alighting of the operator is directly detected by a weight sensor, an optical sensor or the like. Also good.
[0090]
  (4) Instead of the method of detecting the remote control pressure of the remote control valve 5 as the operation state detection means, a pressure switch, a limit switch, a micro switch, a photoelectric switch, or the like that operates when the operator moves the remote control valve 5 is used. Also good.
[0091]
【The invention's effect】
  As aboveToAccording to Ming, the grace time has elapsed after the operation of the operating means has ceased, andAt the grace timeThe operator gets offConditionIn other words, since the engine is automatically stopped only when the operator does not intend to continue the work, there is no possibility that the engine will stop against the operator's intention as in the case of the known technology. The trouble of starting is eliminated.
[0092]
  Further, by providing a grace period, it is possible to give the operator time to select the intention to continue / stop work.
[0093]
  In this case, according to the invention of claim 6, in order to predict the fact to the operator before the automatic stop of the engine, the operator who is going to get off confirms the engine stop and finally selects the work stop / continue. It is possible to avoid unnecessary engine stop as much as possible.
[0094]
  On the other hand, claims 9 to12According to the invention of the engineTheStopAs well asSince the power supply is automatically shut off, it is possible to prevent wasteful discharge when the battery is used as the power supply, and also to stop the electric system to ensure safety.
[0095]
According to the invention of claim 10, since the power is shut off after a lapse of a certain time from the engine stop, it is possible to secure electrical processing (for example, memory processing in a machine equipped with a computer) to be performed together with the engine stop.
[0096]
  Claim 11According to this invention, after the engine is stopped, the power is restored simply by getting on by the operator, so that it is not necessary to take a troublesome procedure for power restoration, and the operation burden on the operator is reduced.
[0097]
According to the invention of claim 12, after the engine is stopped, the key switch is returned from the on position to the off position and then returned to the on position, after confirming the operator's intention to restart the engine. Since the power is restored, there is no possibility that the power is restored unnecessarily.
[0098]
According to the invention of claim 13, the automatic control such as the engine stop and the manual control can be selected according to the preference of the operator and the work environment (for example, when the engine automatic stop is not necessary).
[Brief description of the drawings]
FIG. 1 is a block configuration diagram of a control system of a construction machine according to a first embodiment of the present invention.
FIG. 2 is a flowchart of engine stop and power shutdown control for explaining the operation of the embodiment.
FIG. 3 is a flowchart of the engine restart and power connection control.
FIG. 4 is a timing chart when the gate lever is “opened” before the grace period elapses in engine stop control.
FIG. 5 is a timing chart when the gate lever is “opened” after the grace period has elapsed.
FIG. 6 is a timing chart when the gate lever is operated before the key switch in the engine restart control.
FIG. 7 is a timing chart when the key switch is operated before the gate lever in the same control.
FIG. 8 is a flowchart of engine stop and power shut-off control for explaining the operation according to the second embodiment of the present invention.
FIG. 9 is a flowchart of engine stop and power shut-off control for explaining the operation according to the third embodiment of the present invention.
[Explanation of symbols]
  1 engine
  2 Hydraulic pump
  4 Hydraulic actuator circuit
  5 Remote control valve as operating means
  7 Controller as control means
  9 Controller engine controller
  10, 11 Pressure sensor as operation state detection means
  12 Controller operation state detector
  13 Gate lever as means for detecting getting on and off
  14 Same gate lever switch
  15 Controller entry / exit state detector
  16 Display device as notification means for performing engine stop prediction
  17 The same speaker
  21 Lighting
  25 Key switch
  28 Selection switch as switching means for switching between a state in which the control means is operated and a state in which the control means is not operated

Claims (13)

In a construction machine that operates a hydraulic pump using an engine as a power source and drives a hydraulic actuator by oil discharged from the hydraulic pump based on the operation of the operating means, a pre-set grace period after the operation of the operating means is lost The engine control method for a construction machine is characterized in that the engine is automatically stopped by the control means under the condition that the operator has left the vehicle at the time when the grace period elapses . In a construction machine that operates a hydraulic pump using an engine as a power source and drives a hydraulic actuator by oil discharged from the hydraulic pump based on an operation of the operating means, a boarding / alighting state detecting means for detecting a boarding / alighting state of an operator, and the operating means An operation state detection means for detecting whether or not the operation means is in operation, and a control means. The control means detects a non-operation of the operation means after the operation state detection means detects a non-operation of the operation means. A construction machine characterized in that the engine is automatically stopped under the condition that time has passed and the boarding / alighting state detecting means has detected that the operator has got off when the grace time has elapsed .   3. The construction machine according to claim 2, wherein the control means is configured to reduce the engine speed to a preset standby speed during the grace period.   4. The construction machine control device according to claim 2, wherein a gate lever switch that is operated by a gate lever that opens and closes a gate is used as a boarding / alighting state detection unit, and the control unit is configured to perform the above operation when the gate lever is opened. A construction machine configured to determine that an operator is getting off by a signal of a gate lever switch.   The construction machine according to any one of claims 2 to 4, further comprising an illuminating lamp, wherein the control means is configured not to stop the engine when the illuminating lamp is in a lighting state.   6. The construction machine according to claim 2, wherein the control means is configured to predict the engine stop to the operator before the engine stops.   The control means is configured to guide the engine restart method to the operator when the boarding / alighting state detecting means detects boarding of the operator after the engine is stopped. The construction machine described in Crab.   The control means is configured to guide the restart method to the operator when the key switch for starting the engine is operated from the on position to another position after the engine is stopped. The construction machine according to any one of 2 to 7. Control means, the construction machine according to any one of claims 2 to 8, characterized in that it is configured to cut off the power causes locked stop the engine. 10. The construction machine according to claim 9 , wherein the control means is configured to shut off the power after a preset time has elapsed since the engine stopped . The construction machine according to claim 9 or 10 , wherein the control means is configured to connect a power source when the boarding / alighting state detecting means detects the boarding of the operator after the engine is stopped . The control means is configured to connect a power source when the key switch for starting the engine is returned from the on position to the off position and then operated to the on position after the engine is stopped. 9 or 10 Symbol placement of construction machinery. Construction machine according to any one of claims 2 to 12, wherein the switching means for switching into a state not to act in a state where the action of the control means is provided et the.

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