Engine stop system for a work machine and method for stopping an engine of a work machine

Abstract

To cancel control for delaying engine stop during the control.SOLUTION: A stop system for an engine of a work machine comprises: an engine stop control unit that when a stop instruction is given to stop an engine of a work machine, executes delay stop control of delaying the stop of the engine until a predetermined condition is satisfied and then stopping the engine; and an engine stop control cancel unit that in a case where a cancellation instruction is given to cancel the stop control, cancels the delay stop control when an operation machine of the work machine is in a locked state, and continues the delay stop control when the operation machine is in an unlocked state.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present disclosure relates to an engine stop system for a work machine and a method for stopping an engine of a work machine.

Background Art

[0002] Patent Document 1 discloses a technique for delaying the stop of an engine when the exhaust system temperature exceeds a temperature threshold in response to an engine stop command by an operator. Further, in the technique described in Patent Document 1, while delaying the engine stop, the operator can perform a predetermined operation to immediately stop the engine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the technique described in Patent Document 1 does not include a configuration for canceling the control for delaying and stopping the engine and returning to the normal engine operation while the engine stop is being delayed.

[0005] The present disclosure has been made in view of the above circumstances, and an object thereof is to provide an engine stop system for a work machine and a method for stopping an engine of a work machine that can cancel the control while the control for delaying the engine stop is being performed.

Means for Solving the Problems

[0006] One aspect of the present disclosure is an engine stop control unit that executes delay stop control to delay the stop of the engine until a predetermined condition is satisfied and then stop the engine when there is a stop instruction to instruct the stop of the engine of the work machine, and when there is a cancellation instruction to cancel the stop instruction, when the work implement of the work machine is in a locked state, the delay stop control is aborted, and when the work implement is in an unlocked state, an engine stop control cancellation unit that continues the delay stop control, and is an engine stop system for a work machine including the same.

Effect of the Invention

[0007] According to the engine stop system for a work machine and the engine stop method for a work machine of the present disclosure, the control can be aborted during the control that delays the stop of the engine.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each figure, the same or corresponding components are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0010] (Configuration of the working machine 100) FIG. 1 is a schematic diagram showing the configuration of a working machine 100 according to an embodiment of the present disclosure. The working machine 100 operates at a construction site and constructs a construction target such as earth and sand. The working machine 100 according to an embodiment of the present disclosure is, for example, a hydraulic excavator. However, the working machine of the present disclosure may be other working machines such as a dump truck, a wheel loader, and a motor grader. The working machine 100 includes a traveling body 110, a revolving body 120, a working device 130, and a cab 140. The working machine 100 according to an embodiment of the present disclosure authenticates an operator by performing wireless communication with an operator terminal 300 such as a smartphone held by the operator using a short-range wireless communication method.

[0011] The traveling body 110 supports the working machine 100 so as to be able to travel. The traveling body 110 includes two crawlers 111 provided on the left and right, and two traveling motors 112 for driving each crawler 111. The revolving body 120 is supported by the traveling body 110 so as to be able to revolve around a revolving center.

[0012] The working machine 130 is hydraulically driven. The working machine 130 is supported so as to be vertically drivable at the front part of the revolving body 120. The driver's cab 140 is a space for an operator to board and operate the working machine 100. The driver's cab 140 is provided at the left front part of the revolving body 120. In this embodiment, as shown in FIG. 1, the vertical, left-right, and front-rear directions are defined with reference to the revolving body 120. Further, the part of the revolving body 120 to which the working machine 130 is attached is referred to as the front part. Also, with respect to the revolving body 120, the part on the opposite side with reference to the front part is referred to as the rear part, the part on the left side is referred to as the left part, and the part on the right side is referred to as the right part.

[0013] (Configuration of the revolving body 120) The revolving body 120 includes an engine 121, a hydraulic pump 122, a control valve 123, a slewing motor 124, and a fuel injection device 125. The engine 121 is a prime mover that drives the hydraulic pump 122. The engine 121 is an example of a power source. A starter motor 1211 is provided in the engine 121. The engine 121 is started by the rotation of the starter motor 1211.

[0014] The hydraulic pump 122 is a variable displacement pump driven by the engine 121. The hydraulic pump 122 supplies hydraulic oil to each actuator via the control valve 123. Each actuator includes a boom cylinder 131C, an arm cylinder 132C, a bucket cylinder 133C, a travel motor 112, and a slewing motor 124. The control valve 123 controls the flow rate of the hydraulic oil supplied from the hydraulic pump 122.

[0015] The slewing motor 124 is driven by the hydraulic oil supplied from the hydraulic pump 122 via the control valve 123 to slew the revolving body 120. The fuel injection device 125 injects fuel into the engine 121.

[0016] (Configuration of the working machine 130) The working machine 130 includes a boom 131, an arm 132, a bucket 133, a boom cylinder 131C, an arm cylinder 132C, and a bucket cylinder 133C.

[0017] The base end portion of the boom 131 is attached to the revolving body 120 via a boom pin. The arm 132 connects the boom 131 and the bucket 133. The base end portion of the arm 132 is attached to the tip end portion of the boom 131 via an arm pin. The bucket 133 includes a blade for excavating earth and sand and a storage portion for storing the excavated earth and sand. The base end portion of the bucket 133 is attached to the tip end portion of the arm 132 via a bucket pin.

[0018] The boom cylinder 131C is a hydraulic cylinder for operating the boom 131. The base end portion of the boom cylinder 131C is attached to the revolving body 120. The tip end portion of the boom cylinder 131C is attached to the boom 131. The arm cylinder 132C is a hydraulic cylinder for driving the arm 132. The base end portion of the arm cylinder 132C is attached to the boom 131. The tip end portion of the arm cylinder 132C is attached to the arm 132. The bucket cylinder 133C is a hydraulic cylinder for driving the bucket 133. The base end portion of the bucket cylinder 133C is attached to the arm 132. The tip end portion of the bucket cylinder 133C is attached to a link member connected to the bucket 133.

[0019] (Configuration of the operator's cab 140) A door 141 for the operator to board is provided on the left side surface of the operator's cab 140. The door 141 is provided with a lock actuator 1411 for locking the door 141 and a door switch 1412 for unlocking it.

[0020] FIG. 2 is a diagram showing the internal configuration of the driver's cab 140 according to an embodiment of the present disclosure. FIG. 3 is a diagram showing the configuration of the rotary switch 144 according to an embodiment of the present disclosure. FIG. 4 is a diagram showing an operation example of the lock lever 143LL according to an embodiment of the present disclosure. Inside the driver's cab 140, a driver's seat 142, an operating device 143, a rotary switch 144, and a touch panel 145D are provided. As shown in FIG. 3, the rotary switch 144 is a switch that takes four positions: an OFF position 1442, an ACC (accessory) position 1443, an IG (ignition) position 1444, and an ST (start) position 1445 by rotating a rotating portion 1441 as indicated by a dashed arrow. When the finger is released from the ST position 1445 of the rotary switch 144, it automatically returns to the IG position 1444 by a spring mechanism (not shown). In the OFF position 1442, an instruction to stop the engine 121 is given. In the ACC position 1443, an instruction to stop the engine 121 is given, and an instruction to set a predetermined device to an operating state is given. In the IG position 1444, an instruction to operate the engine 121 is given. In the ST position 1445, an instruction to start the engine 121 is given.

[0021] In the present disclosure, the rotary switch 144 is an example of an ignition switch for an engine. The ignition switch can be configured, for example, as a key switch or a push switch instead of a rotary switch. The rotary switch 144 outputs an electrical signal corresponding to the OFF position 1442, the ACC position 1443, the IG position 1444, or the ST position 1445.

[0022] The operating device 143 is a device for driving the traveling body 110, the slewing body 120, and the work implement 130 by manual operation of an operator. The operating device 143 includes a left operation lever 143LO, a right operation lever 143RO, a left foot pedal 143LF, a right foot pedal 143RF, a left traveling lever 143LT, a right traveling lever 143RT, and a lock lever 143LL.

[0023] The left operation lever 143LO is provided on the left side of the driver's seat 142. The right operation lever 143RO is provided on the right side of the driver's seat 142.

[0024] The left operation lever 143LO is an operating mechanism for performing the turning operation of the slewing body 120 and the excavation / dumping operation of the arm 132. Specifically, when the operator of the work machine 100 tilts the left operation lever 143LO forward, the arm 132 performs a dumping operation. When the operator of the work machine 100 tilts the left operation lever 143LO backward, the arm 132 performs an excavation operation. When the operator of the work machine 100 tilts the left operation lever 143LO to the right, the slewing body 120 turns right. When the operator of the work machine 100 tilts the left operation lever 143LO to the left, the slewing body 120 turns left. In other embodiments, when the left operation lever 143LO is tilted in the front-rear direction, the slewing body 120 may turn right or left, and when the left operation lever 143LO is tilted in the left-right direction, the arm 132 may perform an excavation operation or a dumping operation.

[0025] The right operation lever 143RO is an operating mechanism for performing the excavation / dumping operation of the bucket 133 and the raising / lowering operation of the boom 131. Specifically, when the operator of the work machine 100 tilts the right operation lever 143RO forward, the lowering operation of the boom 131 is executed. When the operator of the work machine 100 tilts the right operation lever 143RO backward, the raising operation of the boom 131 is executed. When the operator of the work machine 100 tilts the right operation lever 143RO to the right, the dumping operation of the bucket 133 is performed. When the operator of the work machine 100 tilts the right operation lever 143RO to the left, the excavation operation of the bucket 133 is performed. In other embodiments, when the right operation lever 143RO is tilted in the front-rear direction, the bucket 133 may perform a dumping operation or an excavation operation, and when the right operation lever 143RO is tilted in the left-right direction, the boom 131 may perform a raising operation or a lowering operation.

[0026] The left foot pedal 143LF is arranged on the left side of the floor surface in front of the driver's seat 142. The right foot pedal 143RF is arranged on the right side of the floor surface in front of the driver's seat 142. The left travel lever 143LT is pivotally supported by the left foot pedal 143LF and is configured such that the inclination of the left travel lever 143LT and the depression of the left foot pedal 143LF are interlocked. The right travel lever 143RT is pivotally supported by the right foot pedal 143RF and is configured such that the inclination of the right travel lever 143RT and the depression of the right foot pedal 143RF are interlocked.

[0027] The left foot pedal 143LF and the left travel lever 143LT correspond to the rotational drive of the left crawler belt of the traveling body 110. Specifically, when the operator of the work machine 100 tilts the left foot pedal 143LF or the left travel lever 143LT forward, the left crawler belt rotates in the forward direction. Also, when the operator of the work machine 100 tilts the left foot pedal 143LF or the left travel lever 143LT backward, the left crawler belt rotates in the reverse direction.

[0028] The right foot pedal 143RF and the right travel lever 143RT correspond to the rotational drive of the right crawler belt of the traveling body 110. Specifically, when the operator of the work machine 100 tilts the right foot pedal 143RF or the right travel lever 143RT forward, the right crawler belt rotates in the forward direction. Also, when the operator of the work machine 100 tilts the right foot pedal 143RF or the right travel lever 143RT backward, the right crawler belt rotates in the reverse direction.

[0029] The lock lever 143LL is a safety device provided to prevent the actuator of the work implement 130 or the like from operating unintentionally by the operator in the non-operating state. The lock lever 143LL is arranged to be rotatable between a lock position and a non-lock position along the side surface of the left console box 142LC erected on the left side of the driver's seat 142. In FIG. 4, the state where the lock lever 143LL shown by the solid line is in the lock position and the state where the lock lever 143LL shown by the chain line is in the non-lock position are shown. By setting the lock lever 143LL to the lock position, the control of the hydraulic oil by the control valve 123 stops. Also, by setting the lock lever 143LL to the lock position, a switch that operates in conjunction with the lock lever 143LL is turned on. The state where the lock lever 143LL is in the lock position is an example of the locked state of the work implement 130. Also, the state where the lock lever 143LL is in the non-lock position is an example of the non-locked state of the work implement 130.

[0030] When the lock lever 143LL is in the lock position, the lock lever 143LL rotates to a position hidden on the side surface side of the left console box of the driver's seat 142, that is, a position retracted from the passage between the door 141 and the driver's seat 142, and is locked. Thereby, the operator can move back and forth between the door 141 and the driver's seat 142. On the other hand, when the lock lever 143LL is in the non-lock position, the lock lever 143LL rotates to a position tilted forward so as to block the passage portion between the driver's seat 142 and the door 141, and is locked. Thereby, when the lock lever 143LL is in the non-lock position, when the operator tries to leave the driver's seat 142, the lock lever 143LL gets in the way and the operator cannot get on or off, so it is possible to prevent the operator from leaving the cab 140 in a state where the actuator of the work implement 130 or the like can operate. Note that the on / off state of the switch that operates in conjunction with the lock lever 143LL is monitored by, for example, a control controller 205 described later.

[0031] (Example of camera configuration) The revolving body 120 is provided with a plurality of cameras 126 that image the surroundings of the work machine 100. In the example shown in FIG. 1, the revolving body 120 is provided with four cameras 126: a camera that images the front region, a camera that images the left side region, a camera that images the rear region, and a camera that images the right side region, among the surroundings of the revolving body 120.

[0032] (Configuration of the control system 145) FIG. 5 is a schematic block diagram showing the hardware configuration of the control system 145 according to an embodiment of the present disclosure. In FIG. 5, solid lines represent power lines, and broken lines represent signal lines. Also, in FIG. 5, the dashed-dotted line represents wireless communication.

[0033] The control system 145 includes a power supply unit 201, a starter signal unit 202, a gateway function controller 203, a monitor controller 204, a control controller 205, and an engine controller 206. The starter signal unit 202, the gateway function controller 203, the monitor controller 204, the control controller 205, and the engine controller 206 are connected to each other via an in-vehicle network such as CAN (Controller Area Network) or Ethernet (registered trademark). The power supply unit 201 supplies electrical energy to each device constituting the control system 145.

[0034] The starter signal unit 202 receives signal inputs from the door switch 1412, the rotary switch 144, the operator terminal 300, and the monitor controller 204. Based on the input signals, the starter signal unit 202 outputs control signals such as activation signals to the gateway function controller 203, the monitor controller 204, the control controller 205, the engine controller 206, the lock actuator 1411, or the cell motor 1211. The controller that receives the activation signal is activated and operates by the electrical energy supplied by the power supply unit 201. The starter signal unit 202 is an example of an activation unit that activates the control controller 205. Note that the starter signal unit 202 always operates while receiving the supply of electrical energy from the power supply unit 201 even when other controllers are in a stopped state. On the other hand, when the working machine 100 is not activated, only the communication unit with the operator terminal 300 of the starter signal unit 202 may be in an activated state, and other components may be in a standby state or may be configured to be intermittently activated.

[0035] Further, the starter signal unit 202 outputs control signals such as an EDS signal, an ACCON signal, and an IGON signal to the monitor controller 204, the control controller 205, and the engine controller 206 via the gateway function controller 203. The EDS (Engine Delay Shutdown) signal is a signal indicating the execution state of the delay stop control. In the present embodiment, the delay stop control is a control for delaying the stop of the engine 121 until a predetermined condition is satisfied and then stopping the engine 121 when there is a stop instruction to instruct the stop of the engine 121 of the work machine 100. Further, the starter signal unit 202 makes determinations such as whether to start the delay stop control, whether to cancel the delay stop control, and whether to end the delay stop control. When the EDS signal is ON, it indicates that the delay stop control is being executed, and when it is OFF, it indicates that the delay stop control is not being executed. Here, the predetermined condition is a determination condition for whether to stop the engine 121. When the predetermined condition is satisfied, the engine 121 is stopped, and when the predetermined condition is not satisfied, the engine 121 continues to operate under the delay stop control. The predetermined condition is, for example, that the temperature of the exhaust system such as the temperature of the injector for urea water in the urea SCR (Selective Catalytic Reduction) system or the temperature related to the engine is below a predetermined temperature threshold, or that the duration of the engine 121 operating in a low-speed idling state, for example, is equal to or longer than a predetermined time threshold. The ACCON (Accessory On) signal is ON when the rotary switch 144 is in a position other than the OFF position 1442 and OFF when in the OFF position 1442. The IGON (Ignition On) signal is ON at the IG position 1444 or the ST position 1445 and OFF at, for example, the OFF position 1442 or the ACC position 1443.

[0036] Further, the starter signal unit 202 inputs, via the gateway function controller 203, signals indicating whether the lock lever 143LL is in the locked position or the unlocked position, signals indicating temperature or the like used when determining predetermined conditions in the delay stop control, or signals indicating the determination results, from the monitor controller 204, the control controller 205, the engine controller 206, etc.

[0037] The gateway function controller 203 relays communications between the controllers such as the starter signal unit 202, the monitor controller 204, the control controller 205, and the engine controller 206.

[0038] The monitor controller 204 controls the display on the touch panel 145D provided in the control system 145 and notifies the occurrence of a touch operation on the touch panel 145D. Note that the control system 145 according to another embodiment may include a monitor without a touch input function such as an LCD (Liquid Crystal Display) and physical buttons instead of the touch panel 145D. In this case, the monitor controller 204 controls the display on the monitor and notifies the pressing of the physical buttons.

[0039] The control controller 205 acquires various data related to the hydraulic devices that control the operation of the work implement 130 by sensors (not shown), and outputs a control signal for controlling the hydraulic devices according to the operation of the operation device 143. That is, the control controller 205 controls the driving of the boom cylinder 131C, the arm cylinder 132C, the bucket cylinder 133C, the travel motor 112, the swing motor 124, etc. The control controller 205 is an example of a vehicle control unit that outputs a control signal for driving the vehicle body of the work machine 100 by the power supplied from the power source.

[0040] The engine controller 206 acquires various data related to the engine 121 by sensors (not shown), and controls the engine 121 by instructing the fuel injection amount to the fuel injection device 125.

[0041] Note that the monitor controller 204, the control controller 205, the engine controller 206, etc. receive control signals such as the EDS signal, the ACCON signal, and the IGON signal from the starter signal unit 202, and execute preset processes based on the control signals such as the EDS signal, the ACCON signal, and the IGON signal. For example, when the IGON signal is on or the ACCON signal is on, the monitor controller 204 displays the screen of the touch panel 145D. For example, when the IGON signal is off and the ACCON signal is off, the monitor controller 204 turns off the screen display of the touch panel 145D. For example, when the EDS signal is on, the control controller 205 stops the drive of the work machine 130. For example, when the EDS signal is on, the engine controller 206 operates the engine 121 in a low-speed idling state. Also, when the IGON signal is off, the engine controller 206 stops the engine 121.

[0042] The control system 145 has a function of performing a login process for an operator boarding the cab 140 by operating the touch panel 145D. For example, the control system 145 may include a controller that performs the login process, or the starter signal unit 202, the gateway function controller 203, and the monitor controller 204 may have a function of performing the login process. Specifically, the control system 145 causes the touch panel 145D to display a selection screen for the operator ID via the monitor controller 204 and accepts the selection of the operator ID. When the selected operator ID indicates an operator having operation authority in the vicinity of the work machine 100, the control system 145 authenticates that the operator boarding the cab 140 has operation authority. The monitor controller 204 is an example of an authentication unit that authenticates the operator of the work machine 100.

[0043] (Operator terminal 300) The operator terminal 300 functions as a peripheral of a short-range wireless communication method by executing a startup program of the machine tool 100 installed in advance. When the operator terminal 300 executes the startup program, it displays a list of the machine tools 100 and accepts a selection of the machine tool 100 to be started from the operator. When the operator terminal 300 accepts the selection of the machine tool 100, for example, it starts transmitting an advertisement packet including the operator ID and the machine ID of the selected machine tool 100.

[0044] (Operation of the control system 145) Next, with reference to FIGS. 6 to 11, an operation example of the delay stop control performed by the control system 145 will be described. FIG. 6 is a flowchart showing an operation example of the control system 145 according to an embodiment of the present disclosure. FIGS. 7 to 11 are diagrams showing display examples of the touch panel 145D according to an embodiment of the present disclosure.

[0045] The process shown in FIG. 6 starts after the engine 121 is started. At the start of the process shown in FIG. 6, it is assumed that the IGON signal is on and the rotary switch 144 is operated to the IG position 1444. Further, the touch panel 145D displays a normal display screen 145D1, which is a display when, for example, the delay stop control shown in FIG. 7 is not being executed. The normal display screen 145D1 includes an overhead image 145DA11 based on the captured images of the four cameras 126 and the computer graphics image of the machine tool 100, the captured image 145DA12 of one of the four cameras 126, predetermined sensor information in the machine tool 100, icons representing operation buttons, and the like.

[0046] In the following description, as an example, it is assumed that the starter signal unit 202 in the control system 145 mainly performs the processing of each step. However, part or all of the processing of each step may be mainly executed by the monitor controller 204, the control controller 205, the engine controller 206, etc. instead of the starter signal unit 202. Also, in FIG. 6, the rotary switch 144 is abbreviated as "R-SW". Also, the delayed stop control is abbreviated as "EDS".

[0047] When the process shown in FIG. 6 is started, the starter signal unit 202 first determines whether the rotary switch 144 is in the ACC position 1443 or the OFF position 1442 (step S11). If it is not in the ACC position 1443 and not in the OFF position 1442 (step S11: NO), the starter signal unit 202 repeatedly executes the determination in step S11 at a predetermined cycle.

[0048] When the rotary switch 144 is in the ACC position 1443 or the OFF position 1442 (step S11: YES), the starter signal unit 202 determines whether the operating condition of the delayed stop control (EDS operating condition) is satisfied (step S12). The operating condition of the delayed stop control is a determination condition for whether to start the delayed stop control. When the operating condition of the delayed stop control is satisfied, the starter signal unit 202 starts the delayed stop control and stops the engine 121 under the delayed stop control. When the operating condition of the delayed stop control is not satisfied, the starter signal unit 202 stops the engine 121 without performing the delayed stop control. The operating condition of the delayed stop control is, for example, that the temperature at a predetermined one or more locations in the exhaust system or the like is equal to or higher than each predetermined temperature threshold. The predetermined temperature threshold is, for example, a temperature value at which it is not desirable to stop the engine 121 in a state where the temperature is equal to or higher than that temperature threshold.

[0049] When the operating conditions for the delay stop control are satisfied (step S12: YES), the starter signal unit 202 sets the EDS signal to ON (step S13), and performs, on the touch panel 145D, a display indicating that the delay stop control is in operation, i.e., a display indicating that the delay stop control is in operation (step S14). FIG. 8 shows an example of the display screen 145D2 in the display indicating that the delay stop control is in operation. The display screen 145D2 includes an overhead image 145DA11 and a display area 145DA2 for displaying that the delay stop control is in operation. In this case, the display area 145DA2 indicates that the delay stop control is in operation by a character string "Engine Delay Shutdown in Operation".

[0050] Next, the starter signal unit 202 determines whether or not the end condition (EDS end condition) for the delay stop control is satisfied (step S15). The end condition for the delay stop control is a determination condition for determining whether or not to stop the engine 121 and end the delay stop control. When the end condition for the delay stop control is satisfied, the starter signal unit 202 stops the engine 121 and ends the delay stop control. The end condition for the delay stop control is, for example, that the temperature at one or a plurality of predetermined locations in the exhaust system or the like is less than each predetermined temperature threshold value. The predetermined temperature threshold value is, for example, a temperature value at which the engine 121 can be appropriately stopped in a state where the temperature is less than the temperature threshold value. Alternatively, the end condition for the delay stop control is, for example, that a predetermined time or more has elapsed since the start of the delay stop control. The predetermined time is, for example, a time sufficient for the temperature to decrease.

[0051] When the termination condition of the delay stop control is satisfied (step S15: YES), the starter signal unit 202 sets the EDS signal to OFF (step S16), and performs, on the touch panel 145D, a delay stop control termination notification display, which is a display indicating that the delay stop control has ended (step S17). FIG. 9 shows an example of the display screen 145D3 in the delay stop control termination notification display. The display screen 145D3 includes an overhead image 145DA11 and a display area 145DA3 for displaying a message indicating that the delay stop control has ended. In this case, the display area 145DA3 represents that the delay stop control has ended by a character string "Engine delay shutdown has ended."

[0052] When the starter signal unit 202 performs the delay stop control termination notification display on the touch panel 145D (step S17), or when the operating condition of the delay stop control is not satisfied (step S12: NO), the starter signal unit 202 sets the IGON signal to OFF (step S18). When the IGON signal is turned OFF, the engine controller 206 stops the engine 121.

[0053] Next, the starter signal unit 202 determines whether the rotary switch 144 is in the ACC position 1443 (step S19). When the rotary switch 144 is in the ACC position 1443 (step S19: YES), if the starter signal unit 202 performed the delay stop control termination notification display in step S17, after a predetermined time has elapsed since the delay stop control termination notification display was performed in step S17, the starter signal unit 202 displays the normal display screen 145D1 on the touch panel 145D (step S20). When the rotary switch 144 is in the ACC position 1443 (step S19: YES), the starter signal unit 202 continuously displays the normal display screen 145D1 on the touch panel 145D (step S20).

[0054] On the one hand, when the rotary switch 144 is not in the ACC position 1443 (step S19: NO), the starter signal unit 202 determines whether the rotary switch 144 is in the OFF position 1442 (step S21). When the rotary switch 144 is in the OFF position 1442 (step S21: YES), if the starter signal unit 202 performed the delayed stop control end notification display in step S17, after a predetermined time has elapsed since the delayed stop control end notification display was performed, the display on the touch panel 145D is turned off (step S22), and the process shown in FIG. 6 ends. When the operating conditions for the delayed stop control were not satisfied in step S12, after a predetermined time has elapsed, the display on the touch panel 145D is turned off (step S22), and the process shown in FIG. 6 ends.

[0055] On the other hand, when the rotary switch 144 is not in the OFF position 1442 (step S21: NO), the starter signal unit 202 outputs a signal corresponding to the position of the rotary switch 144, and the control system 145 executes processing corresponding to the position of the rotary switch 144.

[0056] On the other hand, in step S15, when the end condition for the delayed stop control is not satisfied (step S15: NO), the starter signal unit 202 determines whether the rotary switch 144 is in the IG position 1444 (step S23). When the rotary switch 144 is not in the IG position 1444 (step S23: NO), the starter signal unit 202 determines again after a predetermined time whether the end condition (EDS end condition) for the delayed stop control is satisfied (step S15).

[0057] When the rotary switch 144 is in the IG position 1444 (step S23: YES), the starter signal unit 202 determines whether the lock lever 143LL is in the locked position (step S24). When the lock lever 143LL is in the locked position (step S24: YES), the starter signal unit 202 sets the EDS signal to OFF (step S25), and performs a cancel acceptance display, which is a display indicating that the delay stop control has been canceled, on the touch panel 145D (step S26). FIG. 10 shows an example of the display screen 145D4 in the cancel acceptance display. The display screen 145D4 includes an overhead image 145DA11 and a display area 145DA4 for displaying a message indicating that the delay stop control has been canceled. In this case, the display area 145DA4 represents that the delay stop control has been canceled by the character string "Engine delay shutdown has been canceled."

[0058] Next, after a predetermined time has elapsed since the starter signal unit 202 performed the cancel acceptance display in step S26, the starter signal unit 202 displays the normal display screen 145D1 on the touch panel 145D (step S27). Next, the starter signal unit 202 executes the process of step S11 again.

[0059] On the other hand, when the lock lever 143LL is not in the locked position (step S24: NO), the starter signal unit 202 performs a cancel rejection display, which is a display indicating that the cancellation of the delay stop control is rejected, on the touch panel 145D (step S28). FIG. 11 shows an example of the display screen 145D5 in the cancel acceptance display. The display screen 145D5 includes an overhead image 145DA11 and a display area 145DA5 for displaying a message indicating that the cancellation of the delay stop control is rejected. In this case, the display area 145DA5 represents that the cancellation of the delay stop control is rejected and prompts the user to move the lock lever 143LL to the locked position by the character string "To cancel the engine delay shutdown, set the key position to IG-ON after setting the lock lever to the locked position.", and includes an image showing how to operate the rotary switch 144.

[0060] After the cancellation rejection display is performed on the touch panel 145D (step S28), the starter signal unit 202 determines again whether the end condition of the delay stop control (EDS end condition) is satisfied after a predetermined time (step S15).

[0061] Through the above processing, for example, when the operator operates the rotary switch 144 to the OFF position 1442 while the engine 121 is running, if the operating condition of the delay stop control is not satisfied (step S12: NO), the control system 145 stops the engine 121 (step S18) and turns off the touch panel 145D (step S22).

[0062] Also, for example, when the operator operates the rotary switch 144 to the OFF position 1442 while the engine 121 is running, if the operating condition of the delay stop control is satisfied (step S12: YES), the control system 145 performs a display during the operation of the delay stop control (Figure 8) on the touch panel 145D (step S14). When the end condition of the delay stop control is satisfied (step S15: YES), the control system 145 performs a delay stop control end notification display (Figure 9) on the touch panel 145D (step S17), stops the engine 121 (step S18), and turns off the touch panel 145D (step S22).

[0063] Before the end condition of the delay stop control is satisfied (step S15: NO), if the operator operates the rotary switch 144 to the IG position 1444 (step S23: YES), when the lock lever 143LL is in the locked position (step S24: YES), the control system 145 cancels the delay stop control (step S25), performs a cancellation acceptance display (Figure 10) on the touch panel 145D (step S26), and further performs a normal display (Figure 7) (step S27).

[0064] On the other hand, before the end condition of the delay stop control is satisfied (step S15: NO), if the operator operates the rotary switch 144 to the IG position 1444 (step S23: YES), when the lock lever 143LL is not in the locked position (step S24: NO), the control system 145 performs a cancel rejection display (FIG. 11) (step S28) and continues the delay stop control (after step S15).

[0065] (Function and effect) As described above, according to the present embodiment, the delay stop control can be canceled by operating the rotary switch 144 to the IG position 1444 during the delay stop control that delays the stop of the engine 121. Further, in the present embodiment, when operating to the IG position 1444, as a condition for canceling the delay stop control, it is added that the lock lever 143LL is in the locked position. According to this, when canceling the delay stop control, the lock lever 143LL is in the locked position, so it is possible to prevent the work machine 100 from operating due to an unintended operation of the operating device 143 when canceling the delay stop control.

[0066] (Other embodiments) Although one embodiment has been described in detail with reference to the drawings above, the specific configuration is not limited to the above, and various design changes and the like are possible. That is, in other embodiments, the order of the above-described processes may be appropriately changed. Also, some processes may be executed in parallel. Further, instead of or together with the display of information on the touch panel 145D, information may be output by voice or a notification signal. Further, in the above embodiment, an instruction to cancel the delay stop control is given by operating the rotary switch 144 to the IG position 1444, but it is not limited to this. For example, in addition to operating the rotary switch 144 to the IG position 1444, for example, it may be performed by a predetermined input operation such as touching a predetermined button on the touch panel 145D or pressing a predetermined switch with respect to a predetermined input device such as the touch panel 145D or a predetermined switch.

[0067] In the control system 145 according to the above-described embodiment, some components constituting the control system 145 may be mounted inside the working machine 100, and other components may be provided outside the working machine 100.

[0068] (Computer Configuration) Each device included in the above-described control system 145, such as the starter signal unit 202, the gateway function controller 203, the monitor controller 204, the control controller 205, and the engine controller 206, can be configured using a computer such as a microcomputer or a CPU (Central Processing Unit), and hardware such as peripheral circuits and peripheral devices of the computer. Further, the computer may be configured using a custom LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device). Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). In this case, some or all of the functions realized by the processor may be realized by the integrated circuit.

[0069] (Basic Configuration Example) Next, with reference to FIG. 12, a basic configuration example according to an embodiment of the present disclosure corresponding to the above-described embodiment will be described. FIG. 12 is a functional block diagram according to an embodiment of the present disclosure. The stop system 400 shown in FIG. 12 has a configuration corresponding to the control system 145 shown in FIG. 5, and includes an engine stop control unit 401, an engine stop control cancellation unit 402, and a display unit 403. However, the display unit 403 may be omitted.

[0070] When there is a stop instruction to instruct the stop of the engine 121 of the working machine 100, the engine stop control unit 401 executes delay stop control to delay the stop of the engine 121 until a predetermined condition is satisfied and then stop the engine 121. Here, the stop instruction corresponds to, for example, an input operation of setting the rotary switch 144 to the OFF position 1442 or the ACC position 1443. The predetermined condition corresponds to the delay stop control end condition determined in step S15. The engine stop control unit 401 corresponds to the starter signal unit 202 that performs the determination process in step S11, the determination process in step S15, the process in step S18, and the like.

[0071] When there is a cancellation instruction to cancel the stop instruction (step S23: YES), when the lock lever 143LL of the working machine 100 is in the locked position (step S24: YES), the engine stop control cancellation unit 402 cancels the delay stop control (step S25), and when the lock lever 143LL is in the unlocked position (step S24: NO), the delay stop control is continued. Here, the cancellation instruction corresponds to, for example, an input operation of switching the rotary switch 144 from the OFF position 1442 or the ACC position 1443 to the IG position 1444. The engine stop control cancellation unit 402 corresponds to the starter signal unit 202 that performs the determination process in step S23, the determination process in step S24, the process in step S25, and the like.

[0072] Note that when the lock lever 143LL is in the unlocked position when there is a cancellation instruction (step S23: YES) (step S24: NO), and then when there is a cancellation instruction again (step S23: YES), if the lock lever 143LL is in the locked position (step S24: YES), the engine stop control cancellation unit 402 may cancel the delay stop control.

[0073] Further, when there is a cancellation instruction (step S23: YES), the display unit 403 may change the display content depending on whether the lock lever 143LL is in the locked position (step S24: YES) or the unlocked position (step S24: NO) to a cancellation acceptance display (step S26) or a cancellation rejection display (step S28).

[0074] Further, when there is a cancellation instruction (step S23: YES), if the lock lever 143LL is in the unlocked position (step S24: NO), the display unit 403 may perform a display (FIG. 11) prompting to move the lock lever 143LL to the locked position (step S28).

[0075] Further, when there is a cancellation instruction (step S23: YES), if the lock lever 143LL is in the locked position (step S24: YES), the display unit 403 may perform a display (FIG. 10) indicating cancellation of the delayed stop control (step S26).

[0076] Note that the cancellation instruction is performed, for example, by an operation of turning on the ignition switch of the engine 121. In the above embodiment, the operation of turning on the ignition switch corresponds to the operation of setting the rotary switch 144 to the IG position 1444.

[0077] Alternatively, the cancellation instruction is performed by an operation of turning on the ignition switch of the engine 121 and a predetermined input operation on a predetermined input device. Here, the predetermined input operation on the predetermined input device corresponds to a touch on a predetermined button on the touch panel 145D or a pressing operation of a predetermined switch, etc., on a predetermined input device such as the touch panel 145D or a predetermined switch shown as a modification of the above embodiment.

[0078] According to the engine stop system 400 of the working machine shown in FIG. 12, the control that delays the engine stop can be canceled during that control.

Explanation of Reference Numerals

[0079] 100…Work machine 110…Traveling body 120…Slewing body 130…Work implement 140…Operator's cab 141…Door 1411…Lock actuator 1412…Door switch 144…Rotary switch 145…Control system 145D…Touch panel 201…Power supply unit 202…Starter signal unit 203…Gateway function controller 204…Monitor controller 205…Control controller 206…Engine controller 300…Operator terminal 143LL…Lock lever 400…Stop system 401…Engine stop control unit 402…Engine stop control cancellation unit 403…Display unit

Claims

1. When there is a stop instruction to instruct the stop of the engine of the work machine, an engine stop control unit that executes delay stop control to delay the stop of the engine until a predetermined condition is satisfied and then stop the engine; When there is a cancellation instruction to cancel the stop instruction, when the working machine of the work machine is in a locked state, the delay stop control is aborted, and when the working machine is in an unlocked state, an engine stop control cancellation unit that continues the delay stop control; An engine stop system for a work machine comprising the above.

2. The engine stop control cancellation unit, When the working machine is in an unlocked state when there is the cancellation instruction, when the working machine becomes locked and then there is the cancellation instruction again, the delay stop control is aborted The engine stop system for a work machine according to claim 1.

3. Further comprising a display unit that displays information regarding the delay stop control, When there is the cancellation instruction, the display unit changes the display content depending on whether the working machine is in a locked state or an unlocked state The engine stop system for a work machine according to claim 1 or 2.

4. When there is the cancellation instruction and the working machine is in an unlocked state, the display unit displays a prompt to lock the working machine The engine stop system for a work machine according to claim 3.

5. When there is the cancellation instruction and the working machine is in a locked state, the display unit displays a message to cancel the delay stop control The engine stop system for a work machine according to claim 3 or 4.

6. The cancellation instruction is performed by an operation of turning on the ignition switch of the engine The engine stop system for a work machine according to any one of claims 1 to 5.

7. The cancellation instruction is an operation of turning on the ignition switch of the engine and Performed by a predetermined input operation on a predetermined input device The engine stop system for a work machine according to any one of claims 1 to 5.

8. When there is a stop instruction to instruct the stop of the engine of the work machine, a step of executing delay stop control to delay the stop of the engine until a predetermined condition is satisfied and then stop the engine; When there is a cancellation instruction to cancel the stop instruction, when the working machine of the work machine is in a locked state, a step of aborting the delay stop control, and when the working machine is in an unlocked state, a step of continuing the delay stop control; A method for stopping an engine of a working machine including

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