JP2019027048A - Construction machine - Google Patents

Abstract

To provide a construction machine capable of informing a surrounding of a start of work.SOLUTION: A controller 25 mounted on a revolving super structure 4 has an alarm operation determination unit 27 for determining whether or not a horn switch 14 has been operated, an alarm sound generation determination unit 28 for determining whether or not an alarm sound is generated from an alarm device 20, and an engine start control unit 31 which enables an operation of a key switch 17 when it is determined by the alarm sound generation determination unit 28 that the alarm sound is generated from the alarm device 20, and invalidates the operation of the key switch 17 when it is determined by the alarm sound generation determination unit 28 that no alarm sound is generated from the alarm device 20 in a case of determining by the alarm operation determination unit 27 that the horn switch 14 has been operated.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a construction machine capable of generating an alarm sound when an engine is started.

  In general, a hydraulic excavator, which is a representative example of a construction machine, includes a lower traveling body that can be self-propelled, an upper revolving body that is turnably mounted on the lower traveling body, and a work device that is provided on the front side of the upper revolving body. It is configured. The upper swing body is equipped with an engine, a hydraulic pump, a control valve, and the like. When the operator operates the operation lever, the pressure oil discharged from the hydraulic pump is supplied to various hydraulic actuators via the control valve. As a result, the excavator performs excavation work of earth and sand using the working device while turning the upper turning body.

  And when starting work with a hydraulic excavator, the engine is started (started) after an alarm sound is generated from a horn (alarm device) in order to notify the start of the work to the surroundings (for example, Patent Documents) 1).

JP 2012-7555 A

  By the way, in the hydraulic excavator by patent document 1, after operating a horn switch, it is supposed that an engine can be started. However, if a malfunction has occurred in the horn, there is a possibility that the engine is started without generating an alarm sound.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a construction machine that can notify the start of work to the surroundings.

  The construction machine of the present invention includes an engine mounted on a vehicle body as a power source, an engine starter operated to start the engine, an alarm sound generator that emits an alarm sound toward the periphery of the vehicle body, In a construction machine including an alarm operation device that is operated when an alarm sound is generated from the alarm sound generation device, and a controller that controls the start of the engine based on an operation of the engine start device, the controller includes the controller An alarm operation determination unit that determines whether or not an alarm operation device has been operated, an alarm sound generation determination unit that determines whether or not an alarm sound is generated from the alarm sound generation device, and the alarm operation determination unit When it is determined that the operating device has been operated, when the warning sound generation determination unit determines that the warning sound has been generated from the warning sound generation device An engine start that validates the operation of the engine starter and invalidates the operation of the engine starter when the warning sound generation determination unit determines that the warning sound is not generated from the warning sound generator. And a control unit.

  According to the present invention, the start of work can be reliably notified to the surroundings.

It is a front view which shows the hydraulic shovel applied to the 1st Embodiment of this invention. It is an external appearance perspective view of the partially fracture | rupture which shows the inside of a cab. It is a perspective view which shows the inside of a cab from the back in the state which made the gate lock lever in FIG. 2 the lock position. It is a circuit diagram which shows the electric control system of a controller, a starter motor, and an alarm device. It is a control block diagram which shows engine starting control. It is a flowchart which shows the operation control process of a hydraulic shovel. It is a flowchart which shows the process of the engine starting control in FIG. It is a front view which shows the state which displayed on the screen of a display device in preparation for engine starting. It is a front view which shows the state displayed on the screen of a display device in engine starting standby. It is a front view which shows the state which displayed that the alarm device was out of order on the screen of a display. It is a front view which shows the state which displayed on the screen of a display device at the time of the engine starting standby at the time of emergency engine starting. It is a front view which shows the state which displayed the basic screen after engine starting on the screen of a display. It is a flowchart which shows the process of the engine starting control by the 2nd Embodiment of this invention.

  Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking a hydraulic excavator as an example.

  1 to 12 show a first embodiment of the present invention. In FIG. 1, a hydraulic excavator 1 can turn on a lower traveling body 2 via a crawler-type lower traveling body 2 capable of self-running, a turning wheel 3 provided on the lower traveling body 2, and the turning wheel 3. The upper revolving body 4 that constitutes the vehicle body together with the lower traveling body 2 and the working device 5 that is attached to the front side of the upper revolving body 4 so as to be able to move up and down, and that performs excavation work of soil and the like.

  The revolving frame 6 is a base of the upper revolving body 4 and constitutes a strong support structure. The turning frame 6 is mounted on the lower traveling body 2 via the turning wheel 3 so as to be turnable. A counterweight 7 is provided at the rear end of the revolving frame 6 to balance the weight with the working device 5.

  The engine 8 is disposed on the rear side of the counterweight 7 and is provided on the rear side of the turning frame 6. The engine 8 is mounted on the turning frame 6 in a horizontally placed state in which a crankshaft (not shown) extends leftward and rightward. The engine 8 is a power source configured using, for example, a diesel engine (internal combustion engine), and constitutes a drive source that rotationally drives a hydraulic pump (not shown) that supplies pressure oil to a hydraulic actuator or the like of the working device 5. doing.

  The engine 8 is provided with an engine activation detection sensor 8A that detects the number of revolutions of the engine 8 (see FIG. 4). The engine activation detection sensor 8 </ b> A is connected to a controller 25 described later, and outputs a rotation speed signal of the engine 8 to the controller 25.

  The starter motor 9 is provided in the engine 8 (see FIG. 4). The starter motor 9 rotates a crankshaft (not shown) of the engine 8 when the engine 8 is started. Specifically, the starter motor 9 is connected to a battery 21 described later via a contact 10 </ b> A of the relay 10. The starter motor 9 is driven when a key switch 17 described later is operated to the start position.

  Specifically, when the key switch 17 is operated to the start position, the coil 10B of the relay 10 is excited, the contact 10A is switched ON (closed), and power is supplied from the battery 21 to the starter motor 9. The Thereby, the starter motor 9 can start the engine 8 by rotating the crankshaft of the engine 8. The starter motor 9 stops after the engine 8 is started and the contact 10A of the relay 10 is turned off (opened).

  The cab 11 is provided on the left front side of the revolving frame 6. A driver's seat 12 on which an operator (operator) sits is provided in the cab 11. The cab 11 is formed in a box shape surrounding the driver's seat 12. An openable / closable door 11 </ b> A is provided on the left side surface of the cab 11, and an operator opens and closes the door 11 </ b> A into the cab 11. An operation lever device 13, a gate lock lever 15, an input device 16, and the like, which will be described later, are disposed around the driver's seat 12.

  The operation lever device 13 includes a travel operation lever / pedal 13A disposed on the front side of the driver's seat 12, and left and right work operation levers 13B disposed on both the left and right sides of the driver's seat 12. Has been. The operation lever device 13 outputs an operation signal for operating the lower traveling body 2 and the work device 5. Specifically, the traveling operation lever / pedal 13A is operated when controlling the operation of a traveling hydraulic motor (not shown) for driving the drive wheels (not shown) of the lower traveling body 2. On the other hand, the left and right work operation levers 13B are operated when controlling the operation of the swing hydraulic motor (not shown) that is driven when the upper swing body 4 is swung and the hydraulic cylinders of the work device 5. .

  The horn switch 14 is provided at the tip of a lever 13B1 that constitutes a work operation lever 13B. The horn switch 14 is pressed when a warning sound is emitted from an alarm device 20 (described later) toward the periphery of the hydraulic excavator 1 regardless of whether the engine 8 is started or after the engine 8 is started. Is configured.

  The horn switch 14 is operated to notify the start of the operation around the hydraulic excavator 1 and to call attention when the engine 8 is started. As shown in FIG. 4, the horn switch 14 is provided between an alarm device 20 and a battery 21 described later. In this case, by pressing the horn switch 14, power is supplied from the battery 21 toward the alarm device 20, and an alarm sound is emitted from the alarm device 20. The horn switch 14 is connected to a controller 25 described later, and outputs an operation signal (ON signal) to the controller 25. The horn switch 14 may be provided only on one of the left and right working operation levers 13B, or may be provided on the traveling operation lever / pedal 13A.

  The gate lock lever 15 is provided on the door 11A side (entrance / exit side) of the cab 11 so as to be located below the left operation control lever 13B. The gate lock lever 15 is operated to a lock position (up position) for opening the door of the cab 11 and a lock release position (down position) for blocking the door of the cab 11 when the operator gets in and out of the cab 11. Is. The gate lock lever 15 is connected to a controller 25 described later, and outputs a detection signal of a lock position or a lock release position toward the controller 25.

  When the gate lock lever 15 is at the lock position, the operation of the operation lever device 13 is invalid, and when the gate lock lever 15 is at the lock release position, the operation of the operation lever device 13 is valid. That is, when the gate lock lever 15 is in the locked position, the operation of the excavator 1 is prohibited, and when it is in the unlocked position, the operation of the excavator 1 is permitted.

  Further, when the engine 8 is started, an operation to a start position of a key switch 17 described later is not effective unless the gate lock lever 15 is in the lock position. That is, when the gate lock lever 15 is in the locked position, for example, the start of the engine 8 is permitted by allowing the changeover switch 24 described later to be switched to the closed state, and the gate lock lever 15 is in the unlocked position. Sometimes, the start of the engine 8 is disabled by maintaining the changeover switch 24 in the open state. In this way, in a state where the operation of the operation lever device 13 is valid (lock release position), the engine 8 cannot be started, and an operation not intended by the operator after the engine 8 is started is prevented. ing.

  The input device 16 is located in the cab 11 and provided on the right side of the driver's seat 12. The input device 16 includes a key switch 17 that is operated to start the engine 8, an engine control dial 18 that sets a target rotational speed of the engine 8 within a predetermined range in accordance with the rotational position of the dial, and the like. .

  The key switch 17 is operated using an engine key (not shown) in order to turn on the hydraulic excavator 1 and start or stop the engine 8, and constitutes an engine starter of the present invention. . The key switch 17 can be switched to, for example, three positions: a power source and an engine 8 OFF position, a power source ON position, and an engine 8 start position. The key switch 17 is connected to a controller 25 described later, and outputs a detection signal of the operation position of the key switch 17 toward the controller 25.

  As shown in FIG. 4, the key switch 17 is connected to the battery 21 via a coil 10 </ b> B of the relay 10 and a changeover switch 24 described later. In this case, by operating the key switch 17 to the start position while the changeover switch 24 is in the closed state (ON state), the coil 10B of the relay 10 is excited and the contact 10A is switched to the closed state. Thereby, electric power is supplied from the battery 21 to the starter motor 9, and the engine 8 can be started.

  The display 19 as a monitor is located in the cab 11 and is provided in front of the driver's seat 12. The display 19 is composed of, for example, a liquid crystal monitor, and displays the operation status of the excavator 1 on the screen 19A. The display 19 is connected to a controller 25 described later, and a screen corresponding to a command from the controller 25 is switched and displayed. As shown in FIG. 12, the basic screen displayed after the engine 8 is started displays various information relating to the vehicle body, such as the remaining amount of fuel, the temperature of the engine coolant, the operating time, and the in-vehicle temperature.

  Further, as shown in FIG. 8, when the key switch 17 is operated to the ON position, the display 19 operates the horn switch 14 to start an alarm from a warning device 20 described later when the engine 8 is started. The screen 19A displays a message indicating that a sound must be played (that preparation for activation is in progress). Further, as shown in FIGS. 9 and 11, the display 19 indicates that the engine 8 can be started by operating the key switch 17 from the ON position to the start position after the alarm sound is generated (waiting for activation). Is displayed on the screen 19A.

  Further, as shown in FIG. 10, the display 19 is described later by an alarm sound generation determination unit 28 described later, even though it is determined that the horn switch 14 is operated by an alarm operation determination unit 27 of the controller 25 described later. When it is determined that no alarm sound is generated from the alarm device 20, the fact that the alarm device 20 is malfunctioning (that the horn is malfunctioning) is displayed on the screen 19A.

  The alarm device 20 as a horn is provided in the upper swing body 4 and generates an alarm sound toward the periphery of the excavator 1. This alarm device 20 constitutes an alarm sound generator of the present invention, and is connected to a battery 21 described later via a horn switch 14 (see FIG. 4). In this case, the horn switch 14 is closed by pressing the horn switch 14 (ON operation), and power is supplied from the battery 21 toward the alarm device 20. As a result, the alarm device 20 generates an alarm sound to alert the worker who is working around the excavator 1.

  Moreover, as shown in FIG. 4, the alarm device 20 is connected to a controller 25 described later on the ground side. That is, the controller 25 detects whether or not an alarm sound is generated from the alarm device 20 by detecting the current on the ground side of the alarm device 20 when the horn switch 14 is pressed.

  The battery 21 serves as a power source for electric devices including the starter motor 9 of the engine 8. Specifically, the battery 21 serves as a power source for the starter motor 9, the display device 19, the alarm device 20, the controller 25 described later, and the like. For example, a general lead storage battery is used as the battery 21 as a power storage device that stores electric charges.

  Here, an alarm generation circuit 22 of the alarm device 20 that operates by receiving power supply from the battery 21 and an engine start circuit 23 of the engine 8 (starter motor 9) will be described with reference to FIG.

  The alarm generation circuit 22 is an electric circuit for the alarm device 20 to generate an alarm sound. Specifically, the alarm generation circuit 22 includes a connection between the battery 21 and the alarm device 20, a connection between the horn switch 14 and the controller 25, and a connection between the alarm device 20 and the controller 25.

  Between the battery 21 and the alarm device 20, there is provided a horn switch 14 that normally maintains an open state and is closed by an ON operation. Thereby, when the horn switch 14 is pressed (ON operation) and closed, electric power is supplied from the battery 21 toward the alarm device 20 and an alarm sound is emitted from the alarm device 20. The horn switch 14 is connected to a controller 25, and the controller 25 detects a control signal when the horn switch 14 is pressed. Further, a controller 25 is connected to the ground side of the alarm device 20, and the controller 25 detects whether or not an alarm sound is generated when power is supplied to the alarm device 20.

  The engine start circuit 23 represents an electric circuit for starting the engine 8. Specifically, the engine start circuit 23 includes a connection between the battery 21 and the starter motor 9, a connection between the battery 21 and the key switch 17, a connection between the key switch 17 and the controller 25, and a connection between the changeover switch 24 and the controller 25. Consists of connections.

  A contact 10 </ b> A of the relay 10 is provided between the battery 21 and the starter motor 9. A changeover switch 24 and a coil 10 </ b> B of the relay 10 are provided between the battery 21 and the key switch 17. In this case, the changeover switch 24 is normally in an open state, and is switched from the open state to the closed state under the control of the controller 25.

  The changeover switch 24 is switched from the open state to the closed state based on a control signal from the controller 25 when the controller 25 detects that the alarm device 20 generates an alarm sound. When the key switch 17 is operated to the start position when the changeover switch 24 is in the closed state, power is supplied from the battery 21 to the coil 10B of the relay 10, and the contact 10A of the relay 10 is closed. Thereby, electric power is supplied from the battery 21 to the starter motor 9, and the engine 8 can be started (started) by driving the starter motor 9. That is, when the changeover switch 24 is in the open state, even if the key switch 17 is operated to the start position, the relay contact 10A is not closed, so the engine 8 is not started.

  Next, the controller 25 that controls the start of the engine 8 will be described.

  The controller 25 is mounted on the hydraulic excavator 1 and is connected to the engine 8, the engine start detection sensor 8A, the horn switch 14, the gate lock lever 15, the key switch 17, the display 19, the alarm device 20, the changeover switch 24, and the like. . The controller 25 is constituted by, for example, a microcomputer and has a memory 26 (storage unit).

  The memory 26 stores a processing program for the operation control of the excavator 1 shown in FIG. 6 and the engine start control shown in FIG. Further, the memory 26 has a first set time T1 which is a threshold time for generating an alarm sound set by a setting device 34 described later, and a threshold value for a time when the start position of the key switch 17 is valid. And a third set time T3 that is a threshold value for starting the engine 8 as an emergency means when a malfunction has occurred in the alarm device 20 is stored (stored).

  The controller 25 generates control commands for the engine 8, the display 19 and the like, and executes various control functions (means). Specifically, the controller 25 performs the rotational speed control of the engine 8 based on the control signal from the engine activation detection sensor 8A, the screen switching control of the display 19, and the like.

  Further, the controller 25 performs open / close control (ON / OFF control) of the changeover switch 24 for permitting the start of the engine 8. For this purpose, the controller 25 includes an alarm operation determination unit 27 that detects whether or not the horn switch 14 is operated, an alarm sound generation determination unit 28 that determines whether or not an alarm sound is generated from the alarm device 20, and an alarm. The operation of the alarm sound generation time measuring unit 29 for measuring the time during which the alarm sound is generated from the device 20, the engine start effective time measuring unit 30 for measuring the time when the start of the engine 8 is effective, or the operation of the key switch 17 is enabled or disabled. An engine start control unit 31 to be invalidated, a specific operation detection unit 32 that detects a specific operation of the horn switch 14, and an emergency effective time measurement unit that measures the time during which the engine 8 is activated based on the specific operation of the horn switch 14 33 is comprised. The engine start control by the controller 25 will be described in detail later.

  The setter 34 is mounted on the hydraulic excavator 1 and starts the key switch 17 after the first set time T1 that is a threshold of the time (alarm sound generation time t1) during which the alarm sound is generated and after the first set time T1 continues. By performing the specific operation of the horn switch 14 when the malfunction of the alarm device 20 occurs, and the second set time T2 that is a threshold of the time for validating the operation to the position (engine start valid time t2), A third set time T3, which is a threshold value for a time for validating the operation of the key switch 17 to the start position (emergency effective time t3), is set. The setting device 34 is provided, for example, in the input device 16 so that the operator can arbitrarily set the first setting time T1, the second setting time T2, and the third setting time T3.

  The first set time T1 is a threshold value of the alarm sound generation time t1 measured from when the horn switch 14 is pressed and an alarm sound is generated from the alarm device 20. That is, the first set time T1 is the length of an alarm sound that is sounded to notify the workers around the excavator 1 of the start of work, for example, 0.5 to 2.0 seconds (preferably 1 .0 to 1.5 seconds). In other words, the first set time T1 is a time during which the operator must keep pressing the horn switch 14 before the engine 8 is started. The engine start control unit 31 of the controller 25 switches the changeover switch 24 from the open state to the closed state when the alarm sound generation determination unit 28 determines that the alarm sound has continued for the first set time T1 or more.

  The second set time T2 is set to, for example, 7 to 20 seconds (preferably 10 to 15 seconds) as a threshold of the engine start effective time t2 measured from when the alarm device 20 generates an alarm sound. In this case, the operation of the key switch 17 to the start position is performed within the second set time T2 after the alarm sound generation time t1 measured by the alarm sound generation time measuring unit 29 of the controller 25 continues for the first set time T1 or more. It becomes effective in. That is, the second setting time T2—the first setting time T1 (T2-T1) is the time when the start position of the key switch 17 is valid.

  In this case, the operation to the start position of the key switch 17 is set (measured) with reference to the time when the alarm device 20 generates an alarm sound. Thereby, irrespective of the length of the warning sound of the warning device 20, the time when the start of the engine 8 is effective can be fixed to the second set time T2 from the generation of the warning sound. The engine start control unit 31 of the controller 25 switches the changeover switch 24 from the closed state to the open state when it is determined that the engine start effective time t2 has passed the second set time T2.

  During the third set time T3, the key switch 17 is activated when the engine 8 is started as an emergency means when no alarm sound is generated due to a malfunction in the alarm device 20 even when the horn switch 14 is pressed. It becomes the threshold of time to become. The third set time T3 is set to, for example, 7 to 20 seconds (preferably 10 to 15 seconds) as a threshold for the emergency effective time t3 measured after a specific operation (for example, 10 times pressing) of the horn switch 14. Is done.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, control processing performed by the controller 25 for the operation control of the hydraulic excavator 1 will be described with reference to FIG.

  In step 1, initial setting of the control processing of the excavator 1 is performed. That is, the controller 25 is connected to the battery 21 to start control processing and perform initial setting of various data. In the next step 2, it is determined whether or not the engine is being started. That is, the controller 25 determines whether or not the engine 8 is being started based on a control signal from the engine start detection sensor 8A of the engine 8.

  If “YES” in step 2, that is, if it is determined that the engine is being started, the process proceeds to step 3 where various controls such as traveling control and excavation control of the excavator 1 are performed, and the process returns to step 2. On the other hand, if “NO” in the step 2, that is, it is determined that the engine is not being started, the process proceeds to a step 4, the engine start control shown in FIG. 7 is performed, and the process returns to the step 2.

  Next, engine start control performed by the controller 25 will be described with reference to FIG. The engine start control will be described on the assumption that the gate lock lever 15 is in the locked position (raised position). Further, in the present embodiment, even if the horn switch 14 is pressed, the start of the engine 8 is not permitted if no alarm sound is generated from the alarm device 20 due to a malfunction (failure or the like) of the alarm device 20. Yes. Therefore, a case where the alarm device 20 normally generates an alarm sound will be described first.

  First, in step 11, it is determined whether or not the key switch 17 has been turned ON. That is, whether the operator sitting on the driver's seat 12 operates the key switch 17 of the input device 16 from the OFF position to the ON position by using an engine key (not shown), thereby turning on the hydraulic excavator 1. Determine whether.

  If “YES” in step 11, that is, if it is determined that the key switch 17 has been turned ON, the process proceeds to step 12. On the other hand, if “NO” in step 11, that is, if it is determined that the key switch 17 has not been turned on (is in the OFF position), monitoring is performed until the key switch 17 is turned on.

  In step 12, a display indicating that the engine 8 is being prepared for start-up is displayed on the screen 19A of the display device 19. In this case, for example, as shown in FIG. 8, when the engine 8 is started by displaying characters such as “Please ring the horn” on the screen 19 </ b> A of the display 19, the horn switch 14 is pressed ( Notification that the operation is to be performed. In addition, you may display images, such as the horn switch 14 and the alarm device 20, with the said character.

  In the next step 13, it is determined whether or not a horn failure is displayed on the screen 19 </ b> A of the display 19. In this case, since “Preparing for startup” is displayed in Step 12, “NO” is displayed, and the process proceeds to Step 14.

  In step 14, it is determined whether or not the horn switch 14 is pressed. That is, the alarm operation determination unit 27 of the controller 25 determines whether the operator has turned on the horn switch 14 based on the control signal from the horn switch 14. If “YES” in step 14, that is, if it is determined that the horn switch 14 is pressed, the process proceeds to step 15. On the other hand, if “NO” in step 14, that is, if it is determined that the horn switch 14 is not pressed, the process returns to step 13 via step 28. Step 28 will be described in the control process when no alarm sound is generated from the alarm device 20 described later.

  In step 15, it is determined whether or not the horn is ringing. In this case, the alarm sound generation determination unit 28 of the controller 25 determines whether an alarm sound is generated from the alarm device 20 by detecting a current (control signal) flowing from the battery 21 to the alarm device 20. If “YES” in step 15, that is, if it is determined that the horn is ringing, the process proceeds to step 16. On the other hand, if it is determined that the horn is not ringing, the routine proceeds to step 27. Step 27 will be described in the control process when no alarm sound is generated from the alarm device 20 described later.

  In step 16, counting of the alarm sound generation time t1 and the engine start effective time t2 is started. That is, the alarm sound generation time measuring unit 29 of the controller 25 measures the alarm sound generation time t1 from when the alarm sound starts to be generated from the alarm device 20 until the alarm sound stops. Further, the engine start effective time measuring unit 30 of the controller 25 measures the engine start effective time t2 from when the alarm sound starts to be generated from the alarm device 20.

  In the next step 17, the first set time continuation determination (T1 ≦ t1) is performed. That is, the engine start control unit 31 of the controller 25 determines whether or not the alarm sound generation time t1 measured by the alarm sound generation time measurement unit 29 has passed the first set time T1. For example, when the first set time T1 is set to 1 second, it is determined whether or not an alarm sound is generated from the alarm device 20 by pressing the horn switch 14 for 1 second or longer.

  If “YES” in step 17, that is, if it is determined that the alarm sound generation time t 1 has passed the first set time T 1, the process proceeds to step 18. On the other hand, if “NO” in step 17, that is, if it is determined that the alarm sound generation time t1 has not passed the first set time T1, the process proceeds to step 13.

  In step 18, a display indicating that the engine 8 is on standby is displayed on the screen 19 </ b> A of the display 19. That is, the controller 25 outputs a control signal for switching the display screen of “Preparing for start-up” displayed on the screen 19 </ b> A of the display device 19 to “Waiting for start-up” toward the display device 19. In this case, for example, as shown in FIG. 9, characters such as “Engine can be started” are displayed on the screen 19 </ b> A of the display 19 and the key switch 17 is operated to the start position to start the engine 8. Inform that it is possible. An image of the key switch 17 or the like may be displayed together with the characters. Further, the remaining number of seconds that the engine can be started, that is, the second set time T2-engine start effective time t2 (T2-t2) may be displayed.

  In the next step 19, the changeover switch 24 is switched to ON (closed state). That is, the engine start control unit 31 of the controller 25 outputs a control signal for switching from the open state (OFF state) to the closed state (ON state) toward the changeover switch 24. As a result, the coil 10B of the relay 10 can be excited by the operation of the key switch 17 to the start position.

  In the next step 20, the emergency effective time t3 is counted. The emergency effective time t3 indicates that the engine 8 is effectively started by performing a specific operation (step 29) of the horn switch 14 when a malfunction occurs in the alarm device 20 ("NO" in step 15). It measures the time which becomes. Therefore, when the alarm sound is normally generated from the alarm device 20 (in the case of “YES” in step 15), the emergency valid time t3 is not counted.

  The controller 25 can determine whether or not to count the emergency effective time t3 by checking a flag or the like that is set when a specific operation of the horn switch 14 is performed. In this flow, since the alarm device 20 is normally generating an alarm sound (“YES” in step 15), the flag is not set, and therefore the emergency effective time t3 is not counted, and the next time Proceed to step 21.

  In step 21, the second set time elapse determination (T2 ≦ t2) or the third set time elapse determination (T3 ≦ t3) is performed. In this case, when the engine start effective time t2 is counted (measured) in step 16, a second set time elapse determination (T2 ≦ t2) is performed. On the other hand, when the emergency effective time t3 is counted (measured) in step 20, a third set time elapse determination (T3 ≦ t3) is performed. Since the current flow is through step 16, the second set time elapse determination (T2 ≦ t2) is performed.

  That is, the engine start control unit 31 of the controller 25 determines whether or not the engine start effective time t2 measured by the engine start effective time measuring unit 30 has passed the second set time T2. As an example, when the second set time T2 is set to 10 seconds, it is determined whether or not 10 seconds have elapsed since the alarm sound was generated from the alarm device 20.

  If “YES” in the step 21, that is, if it is determined that the engine start effective time t2 has passed the second set time T2, the process proceeds to a step 25. On the other hand, if “NO” in the step 21, that is, if it is determined that the engine start effective time t2 has not passed the second set time T2, the process proceeds to a step 22.

  In step 22, it is determined whether or not the key switch 17 has been operated to the start position. That is, the engine start control unit 31 of the controller 25 determines whether or not the key switch 17 is operated to the start position within the second set time T2 based on the control signal output from the key switch 17. If “YES” in step 22, that is, if it is determined that the key switch 17 has been operated to the start position, the process proceeds to step 23. On the other hand, if “NO” in the step 22, that is, if it is determined that the key switch 17 is not operated to the start position, the process returns to the step 21 to monitor the elapse of the engine start effective time t2.

  In step 23, the engine 8 is started (started). That is, as shown in FIG. 4, when the key switch 17 is operated to the start position, the coil 10B of the relay 10 is excited to switch the contact 10A from the open state to the closed state. Thereby, electric power is supplied from the battery 21 toward the starter motor 9, and the engine 8 can be started (started) by driving the starter motor 9.

  In the next step 24, the basic screen is displayed on the screen 19A of the display 19. That is, the controller 25 outputs a control signal for switching the display screen of “waiting for activation” displayed on the screen 19 </ b> A of the display device 19 to the basic screen to the display device 19. In this case, for example, as shown in FIG. 12, the screen 19A of the display 19 displays the remaining amount of fuel, the temperature of the oil, the temperature of the room (in the cab 11), and the like.

  In step 25, the changeover switch 24 is switched to OFF (open state). That is, the controller 25 determines that the engine 8 has started before the engine start effective time t2 has passed the second set time T2 (step 23) or the engine start effective time t2 has passed the second set time T2. ("YES" in step 21), the changeover switch 24 is switched from the closed state to the open state. As a result, the connection between the battery 21 and the coil 10B of the relay 10 is disconnected, and thereafter, the starter motor 9 is not driven even when the key switch 17 is operated to the start position (see FIG. 4).

  In the next step 26, the alarm sound generation time t1, the engine start effective time t2, and the emergency effective time t3 are reset. That is, the controller 25 measures the alarm sound generation time t1 measured by the alarm sound generation time measurement unit 29, the engine start effective time t2 measured by the engine start effective time measurement unit 30, and the emergency effective time measurement unit 33. The emergency effective time t3 is reset to the initial value, and the process returns.

  Next, a control process for urgently starting the engine 8 when no alarm sound is generated from the alarm device 20 even when the horn switch 14 is pressed (that is, when a malfunction occurs in the alarm device 20). explain.

  In step 14 from step 11 to step 13, it is determined whether or not the horn switch 14 is pressed. If "YES" in step 14, that is, if it is determined that the horn switch 14 is pressed, the process proceeds to step 15 to determine whether or not the horn is ringing. If “NO” in step 15, that is, if it is determined that no alarm sound is generated from the alarm device 20, the process proceeds to step 27. The malfunction of the alarm device 20 can be considered, for example, when a disconnection occurs between the battery 21 and the alarm device 20 or when a failure occurs in an internal device of the alarm device 20.

  In step 27, a horn failure is displayed on the screen 19A of the display 19. That is, the controller 25 outputs a control signal to the display device 19 for switching the “preparation for starting” display screen displayed on the screen 19A of the display device 19 to “horn failure”. In this case, for example, as shown in FIG. 10, characters such as “the horn is out of order” are displayed on the screen 19 </ b> A of the display 19 to notify that no alarm sound is generated from the alarm device 20. . An image of the alarm device 20 or the like may be displayed together with the characters.

  In the next step 28, the alarm sound generation time t1, the engine start effective time t2, and the emergency effective time t3 are reset, and the process proceeds to step 13. Since the alarm sound generation time t1, the engine start effective time t2, and the emergency effective time t3 are not counted until step 15, the controller is normally reset (initial value). The resetting is performed in consideration of the case in which the count values of the previous alarm sound generation time t1, the engine start effective time t2, and the emergency effective time t3 remain due to the malfunction of 25.

  In step 13, it is determined whether or not a horn failure is displayed on the screen 19 </ b> A of the display 19. In this case, since the display is switched to “horn failure” in step 27, “YES” is determined, and the process proceeds to step 29.

  In step 29, it is determined whether or not the horn switch 14 has been pressed 10 times (specific operation). In this case, the specific operation detection unit 32 of the controller 25 determines whether or not a specific operation has been performed on the horn switch 14. In addition, when the specific operation detection unit 32 detects that the horn switch 14 is pressed 10 times, the specific operation detection unit 32 sets a specific operation detection flag. This specific operation may be performed within a predetermined time (for example, within 10 to 20 seconds) after the horn failure is displayed on the screen 19A of the display device 19.

  If it is determined "NO" in step 29, that is, if the horn switch 14 has not been pressed 10 times (that is, pressed 1 to 9 times), the process proceeds to step 30 to count the number of times the horn switch 14 is pressed. Then, the process proceeds to step 14. On the other hand, if “YES” in the step 29, that is, if it is determined that the horn switch 14 is pressed 10 times, the process proceeds to a step 18.

  In step 18, a display indicating that the engine 8 is on standby is displayed on the screen 19 </ b> A of the display 19. That is, the controller 25 outputs a control signal for switching the display screen of “horn failure display” displayed on the screen 19 </ b> A of the display device 19 to “waiting for activation” to the display device 19. In this case, for example, as shown in FIG. 11, characters such as “Emergency engine can be started” are displayed on the screen 19 </ b> A of the display device 19, and the engine is operated by operating the key switch 17 to the start position. It is informed that starting of 8 is possible. An image of the key switch 17 or the like may be displayed together with the characters. Moreover, you may display how many seconds must perform emergency engine starting. Then, in the next step 19, the changeover switch 24 is switched from OFF to ON (closed state), and the process proceeds to step 20.

  In step 20, the emergency effective time t3 is counted. In this flow, the alarm device 20 has a problem (“NO” in step 15), and the horn switch 14 is operated 10 times (“YES” in step 29). Start counting. In this case, the emergency valid time measuring unit 33 of the controller 25 can start counting the emergency valid time t3 by checking the flag set in step 29.

  In the next step 21, a third set time elapse determination (T3 ≦ t3) is performed. That is, the engine start control unit 31 of the controller 25 determines whether or not the emergency effective time t3 measured by the emergency effective time measuring unit 33 has passed the third set time T3. As an example, when the third set time T3 is set to 10 seconds, has 10 seconds passed since the horn switch 14 was pressed 10 times and the changeover switch 24 was switched from the open state to the closed state? Determine whether or not.

  If “YES” in the step 21, that is, if it is determined that the emergency valid time t3 has passed the third set time T3, the process returns via the step 25 and the step 26. On the other hand, if “NO” in step 21, that is, if it is determined that the emergency valid time t3 has not passed the third set time T3, the process proceeds to step 22 where the key switch 17 is operated to the start position. Proceeding to step 23, the engine 8 can be started. Thereafter, the process returns via step 24, step 25, and step 26.

  Thus, according to the present embodiment, the engine 8 that is mounted on the vehicle body and serves as a power source, the key switch 17 that is operated to start the engine 8, and the alarm device 20 that emits an alarm sound toward the periphery of the vehicle body. And a horn switch 14 that is operated when an alarm sound is generated from the alarm device 20 and a controller 25 that controls the start of the engine 8 based on the operation of the key switch 17. The horn switch 14 includes an alarm operation determination unit 27 that determines whether or not the switch 14 is operated, an alarm sound generation determination unit 28 that determines whether or not an alarm sound is generated from the alarm device 20, and the alarm operation determination unit 27. When it is determined that an alarm sound is generated from the alarm device 20 by the alarm sound generation determination unit 28 An engine start control unit 31 that validates the operation of the switch 17 and invalidates the operation of the key switch 17 when the alarm sound generation determination unit 28 determines that no alarm sound is generated from the alarm device 20. It is characterized by that.

  That is, when the engine is started, the operation of the key switch 17 to the start position is not effective unless the horn switch 14 is operated and an alarm sound is generated from the alarm device 20. In other words, if no alarm sound is generated from the alarm device 20 even when the horn switch 14 is operated, the operation of the key switch 17 to the start position is invalidated. Thereby, the start of an operation | movement can be alert | reported reliably around the hydraulic shovel 1. FIG.

  The controller 25 has an alarm sound generation time measurement unit 29 that measures the time during which an alarm sound is generated from the alarm device 20, and the engine start control unit 31 is measured by the alarm sound generation time measurement unit 29. The operation of the key switch 17 is validated within a preset second set time T2 after the preset time has elapsed for the preset first set time T1.

  In this case, the second set time T2 is set with respect to a measurement time (engine start effective time t2) from when the alarm sound generation time measurement unit 29 starts measuring the generation of the alarm sound. Yes. That is, the operation of the key switch 17 to the start position is enabled within the second set time T2 from the start of the generation of the alarm sound after the alarm sound continues for the first set time T1. Thereby, the end of the period during which the operation to the start position of the key switch 17 becomes effective can be fixed regardless of the generation time of the alarm sound.

  Further, the controller 25 has a specific operation detection unit 32 that detects a specific operation of the horn switch 14, and the engine start control unit 31 is a key switch when the specific operation detection unit 32 detects a specific operation of the horn switch 14. It is characterized by enabling 17 operations.

  That is, when a malfunction occurs in the alarm device 20, the operation to the start position of the key switch 17 is enabled by the specific operation of the horn switch 14. Thereby, even if the alarm device 20 is out of order, the engine 8 can be started when the hydraulic excavator 1 is to be operated urgently.

  Further, a display 19 for displaying information is further provided, and the display 19 displays on the screen 19A that the horn switch 14 must be operated when the engine 8 is started. . Thus, when starting the engine 8, before operating the key switch 17 to the start position, the operator is urged to operate the horn switch 14 to inform the surroundings of the start of work. it can.

  Further, a display 19 for displaying information is further provided. The display 19 displays on the screen 19A that the engine 8 can be started by operating the key switch 17. Thereby, the operator can recognize that the operation to the start position of the key switch 17 is effective.

  Further, a display 19 for displaying information is further provided, and the display 19 is provided with an alarm device 20 by the alarm sound generation determination unit 28 even though the alarm operation determination unit 27 determines that the horn switch 14 has been operated. When it is determined that no alarm sound has been generated, the fact that the alarm device 20 is malfunctioning is displayed on the screen 19A. As a result, the operator can recognize that no alert has been made around the alarm device 20 and that the alarm device 20 has a problem due to the absence of an alarm sound when starting work. .

  Next, FIG. 13 shows a second embodiment of the present invention. The feature of the second embodiment is that the second set time T4 is set with respect to the measurement time (engine start effective time t4) from when the generation of the alarm sound is stopped. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  The engine start effective time measuring unit 30 of the controller 25 is effective when the alarm sound generation time measuring unit 29 stops measuring the time during which the alarm sound is generated, that is, when the operation of pressing the horn switch 14 is stopped. Time t4 is measured. Therefore, the second set time T4 corresponds to the time from when the alarm sound generation time measuring unit 29 stops measuring the time when the alarm sound is generated, for example, 7 to 20 seconds (preferably 10 to 10 seconds). 15 seconds).

  FIG. 13 shows the engine start control performed by the controller 25. In the engine start control shown in FIG. 13, the case where the engine 8 is started urgently when a problem occurs in the alarm device 20 is omitted, but the horn switch is also used in the second embodiment. The engine 8 may be started by the 14 specific operations. Also in the present embodiment, description will be made on the assumption that the gate lock lever 15 is in the locked position (raised position).

  Steps 11 to 15 are controlled in the same manner as steps 11 to 15 in FIG. 7 described above. If “YES” in step 15, that is, if it is determined that the horn is ringing, the process proceeds to step 31. On the other hand, if “NO” in step 15, that is, it is determined that the horn is not ringing, the process returns to step 14 via steps 27 and 28.

  In step 31, the alarm sound generation time t1 starts to be counted. That is, the alarm sound generation time measurement unit 29 of the controller 25 measures the duration time during which the alarm sound is generated. In the second embodiment, the engine start effective time measuring unit 30 does not start counting the engine start effective time t4.

  In the next step 17, the first set time continuation determination (T1 ≦ t1) is performed. That is, the engine start control unit 31 of the controller 25 determines whether or not the alarm sound generation time t1 measured by the alarm sound generation time measurement unit 29 has passed the first set time T1. For example, when the first set time T1 is set to 1 second, it is determined whether or not an alarm sound is generated from the alarm device 20 by pressing the horn switch 14 for 1 second or longer.

  Then, if “YES” in step 17, that is, if it is determined that the alarm sound generation time t 1 has passed the first set time T 1, the process proceeds to step 18, and the “activation” shown in FIG. The message “waiting” is displayed, and the process proceeds to step 32. On the other hand, if “NO” in the step 17, that is, if it is determined that the alarm sound generation time t1 has not passed the first set time T1, the process returns to the step 14.

  In step 32, it is determined whether or not the horn is ringing. That is, it is determined whether or not the pressing operation of the horn switch 14 is stopped. In this case, the alarm sound generation determination unit 28 of the controller 25 determines whether or not an alarm sound is generated from the alarm device 20 by detecting a current (control signal) flowing from the battery 21 to the alarm device 20. Can do. Then, if “YES” in step 32, that is, if it is determined that the horn is ringing, the horn ringing is stopped (stopping the pressing operation of the horn switch 14). On the other hand, if it is determined that the horn is not ringing, the process proceeds to step 19 where the changeover switch 24 is turned ON (closed state) and the process proceeds to step 33.

  In step 33, counting of the engine start effective time t4 is started. That is, the engine start effective time measuring unit 30 of the controller 25 measures the engine start effective time t4 from when the alarm sound generated from the alarm device 20 stops and the changeover switch 24 is switched to the closed state. , Go to Step 34.

  In step 34, the second set time elapse determination (T4 ≦ t4) is performed. That is, the engine start control unit 31 of the controller 25 determines whether or not the engine start effective time t4 measured by the engine start effective time measuring unit 30 has passed the second set time T4. As an example, when the second set time T4 is set to 10 seconds, it is determined whether or not 10 seconds have elapsed since the alarm sound generated from the alarm device 20 was stopped.

  Then, if “YES” in the step 34, that is, if it is determined that the engine start effective time t 4 has passed the second set time T 4, the process returns through the steps 25 and 26. On the other hand, if “NO” in the step 34, that is, if it is determined that the engine start effective time t4 has not passed the second set time T4, the process returns from the step 22 to the step 26.

  Thus, also in the second embodiment, the same operations and effects as those in the first embodiment can be obtained. In particular, in the second embodiment, the controller 25 has an alarm sound generation time measurement unit 29 that measures the time during which an alarm sound is generated from the alarm device 20, and the engine start control unit 31 generates an alarm sound. After the time measured by the time measuring unit 29 continues for a preset first set time T1, the operation of the key switch 17 is validated within a preset second set time T4. In this case, the second set time T4 is set with respect to the measurement time (engine start effective time t4) from when the alarm sound generation time measurement unit 29 stops measuring the generation of the alarm sound. Yes.

  That is, the start of counting at the second set time T4 is based on when the horn ringing stops (the pressing operation of the horn switch 14 is stopped) and the changeover switch 24 is switched to the closed state. The engine start effective time t4 is measured after the horn ringing stops and the changeover switch 24 is switched to the closed state.

  As a result, regardless of the length of the alarm sound generated from the alarm device 20, the time during which the operation to the start position of the key switch 17 is valid after the alarm sound has stopped can be made constant. Therefore, even when the horn switch 14 has been pressed for a longer time than the first set time T1, the engine 8 is started with a margin within the second set time T4 from when the horn switch 14 is stopped. be able to.

  Further, in the second embodiment, since the count of the engine start effective time t4 is started after the changeover switch 24 is turned on (closed state) in step 19, the alarm of the first embodiment is started. The third set time T3 set corresponding to the malfunction of the device 20 can be unified with the second set time T4. This eliminates the need to set the third set time T3 separately and eliminates the need to count the emergency valid time t3 (the emergency valid time t3 can be set as the engine start valid time t4). The control process of the controller 25 can be simplified.

  In the first embodiment described above, the alarm sound generation determination unit 28 of the controller 25 detects whether or not an alarm sound is generated from the alarm device 20 by detecting the current on the ground side of the alarm device 20. The case where the determination is made has been described as an example. However, the present invention is not limited to this. For example, the alarm device 20 is provided with detectors such as a sound sensor and a vibration sensor, and the alarm sound generation determination unit 28 detects the control signal from the detector to detect the alarm device. Whether or not an alarm sound is generated from 20 may be determined. The same applies to the second embodiment.

  Further, in the first embodiment described above, the case has been described as an example on the assumption that the gate lock lever 15 is in the lock position (raised position) when the engine 8 is started. However, the present invention is not limited to this. For example, the gate lock lever 15 may be in the lock position before the changeover switch 24 is turned on in step 19 shown in FIG. The same applies to the second embodiment.

  Further, in the first embodiment described above, the case where the setting device 34 is mounted on the excavator 1 is described as an example. However, the present invention is not limited to this. For example, the setting device may be an external terminal that is not mounted on the excavator 1. In this case, the setter can be connected to the controller 25 so that the first set time T1, the second set time T2, and the third set time T3 can be stored (stored) in the memory 26 in advance. The same applies to the second embodiment.

  In the first embodiment described above, the case where the alarm device 20 is directly connected to the battery 21 via the horn switch 14 has been described as an example. However, the present invention is not limited to this. For example, when the controller 25 detects a pressing operation (ON operation) of the horn switch 14, a control signal is output from the controller 25 to the alarm device to generate an alarm sound. Also good. The same applies to the second embodiment.

  Further, in the first embodiment described above, the specific operation of the horn switch 14 when starting the engine 8 when the alarm device 20 is malfunctioning is described as the horn switch 14 being pressed 10 times. did. However, the present invention is not limited to this. For example, the specific operation may be performed by pressing the horn switch 14 10 times or less (for example, 5 to 9 times) or 10 times or more. The specific operation may be a long press of the horn switch 14 (for example, 10 seconds or more). The same applies to the second embodiment.

  In the above-described embodiment, the case where the key switch 17 is operated using an engine key (not shown) has been described as an example. However, the present invention is not limited to this. For example, the key switch 17 may be a push button type switch.

  Moreover, in embodiment mentioned above, the case where the vehicle body was comprised by the lower traveling body 2 and the upper revolving body 4 supported so that turning on the lower traveling body 2 was mentioned as an example. However, the present invention is not limited to the vehicle body composed of the lower traveling body 2 and the upper revolving body 4, and may be a single vehicle body that is capable of self-propelling without having a revolving body, such as a wheel loader or a road roller. .

  In the embodiment described above, the cab specification hydraulic excavator 1 has been described as an example. However, the present invention is not limited to this, and may be applied to, for example, a canopy-type hydraulic excavator. Furthermore, the present invention can also be applied to other construction machines such as a mobile crane.

1 Excavator (construction machine)
2 Lower traveling body (car body)
4 Upper swing body (car body)
8 Engine 14 Horn switch (alarm operating device)
17 Key switch (Engine starter)
19 Display (Monitor)
19A Screen 20 Alarm device (alarm sound generator)
25 controller 27 alarm operation determination unit 28 alarm sound generation determination unit 29 alarm sound generation time measurement unit 31 engine start control unit 32 specific operation detection unit T1 first set time T2, T4 second set time

Claims (8)

An engine that is mounted on the vehicle body and serves as a power source;
An engine starter operated to start the engine;
An alarm sound generating device that emits an alarm sound toward the periphery of the vehicle body;
An alarm operating device that is operated when an alarm sound is emitted from the alarm sound generating device;
In a construction machine provided with a controller that controls starting of the engine based on operation of the engine starting device,
The controller is
An alarm operation determination unit for determining whether or not the alarm operation device has been operated;
An alarm sound generation determination unit for determining whether an alarm sound is generated from the alarm sound generation device;
When it is determined that the warning operation device is operated by the warning operation determination unit, the operation of the engine starter is operated when the warning sound generation determination unit determines that the warning sound is generated from the warning sound generation device. And an engine start control unit that disables the operation of the engine start device when it is determined by the alarm sound generation determination unit that the alarm sound is not generated from the alarm sound generation device. A featured construction machine. The controller has a warning sound generation time measuring unit that measures a time during which the warning sound is generated from the warning sound generation device,
The engine start control unit validates the operation of the engine start device within a preset second set time after the time measured by the alarm sound generation time measurement unit continues for a preset first set time. The construction machine according to claim 1, wherein:   The construction machine according to claim 2, wherein the second set time is set with respect to a measurement time from when the alarm sound generation time measurement unit starts measuring the generation of the alarm sound. .   3. The construction machine according to claim 2, wherein the second set time is set with respect to a measurement time from when the alarm sound generation time measurement unit stops measuring the generation of the alarm sound. . The controller includes a specific operation detection unit that detects a specific operation of the alarm operation device;
The construction machine according to claim 1, wherein the engine start control unit validates the operation of the engine start device when the specific operation detection unit detects a specific operation of the alarm operation device. A monitor for displaying information;
The construction machine according to claim 1, wherein the monitor displays on a screen that the alarm operation device must be operated when the engine is started. A monitor for displaying information;
The construction machine according to claim 1, wherein the monitor displays on a screen that the engine can be started by operating the engine starter. A monitor for displaying information;
The monitor determines that the warning sound is not generated from the warning sound generation device by the warning sound generation determination unit even though the warning operation determination unit determines that the warning operation device has been operated. The construction machine according to claim 1, wherein when the alarm is generated, the fact that the alarm sound generating device is broken is displayed on a screen.

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