cargo handling vehicle

Abstract

To provide a cargo handling vehicle capable of preventing a battery cover from being left open during charging. [Solution] A forklift (1) comprising a vehicle body (10), an audio alert unit (2), and a control unit, further comprising a battery (BT1), a battery storage unit (BT2), a battery cover (BT3), a vehicle-side outlet (BT4), and a charging operation unit (BT5) that accepts a charging start operation. The control unit includes a first control unit (40) and a second control unit (50) that instructs the audio alert unit (2) to play warning audio data when a judgment condition for the warning audio data is met. The judgment conditions include at least one of a first judgment condition that a charging plug has been connected to the vehicle-side outlet (BT4) and a second judgment condition that a charging start operation has been performed. The warning audio data includes information to prompt the operator to open the battery cover (BT3).

Description

[Technical Field]

[0001] The present invention relates to a cargo handling vehicle such as a forklift. [Background technology]

[0002] Conventionally, forklifts have been known that warn operators with buzzers or warning lights when dangerous behavior occurs. For example, when there is a step on the road surface, the forklift described in Patent Document 1 lights up a warning light provided on the instrument panel in the driver's seat or sounds a buzzer to notify the operator that a step is nearby.

[0003] However, dangerous behaviors of forklifts include not only driving on roads with uneven surfaces but also various other behaviors (for example, colliding with an obstacle above or with a person). For this reason, there is a problem that if the warning means used by the forklift described in Patent Document 1 are only a buzzer and a warning light, the operator cannot immediately determine what kind of dangerous behavior has been detected.

[0004] To solve the above problems, the inventor of the present application invented an alert system that defines dangerous behaviors in advance and issues an audio warning (audio alert) when a defined dangerous behavior occurs (see, for example, Patent Document 2). The alert system described in Patent Document 2 allows a forklift operator to immediately determine which dangerous behavior has been detected by the audio alert and take appropriate action. Furthermore, the alert system described in Patent Document 2 classifies dangerous behaviors into risk levels and changes the frequency of audio alerts (for example, playback time or number of playbacks) according to the risk level, thereby avoiding dangerous behaviors and ensuring safety while minimizing declines in work efficiency.

[0005] Incidentally, in forklifts equipped with batteries (e.g., lead batteries), the battery cover must be left open when charging the battery to prevent the accumulation of hydrogen gas generated during charging. In this regard, the alert system described in Patent Document 2 does not provide a warning to prevent the battery cover from being left open during charging. Such a warning is extremely important from the perspective of reducing the risk of fire or explosion due to hydrogen gas. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-272700 [Patent Document 2] Patent No. 7623096 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cargo handling vehicle that can prevent the battery cover from being left open during charging. [Means for solving the problem]

[0008] In order to solve the above problem, the cargo handling vehicle according to the present invention comprises: a vehicle body provided with a loading device; a voice alert unit that stores warning voice data and reproduces the warning voice data to give a voice alert; a control unit that controls the vehicle body and the audio alert unit; A cargo handling vehicle comprising: The vehicle body includes: a battery that is a power source for the running operation and loading / unloading operation of the vehicle body; a battery storage section having an opening and configured to store the battery; a battery cover that closes the opening when in a closed state and opens the opening when in an open state; a vehicle-side outlet to which a charging plug for charging the battery is connected; a charging operation unit that accepts a charging start operation by an operator to perform the charging, The control unit a first control unit that controls the vehicle body; a second control unit that stores data relating to a determination condition for reproducing the warning audio data, and instructs the audio alert unit to reproduce the warning audio data when the determination condition is satisfied; the determination conditions include at least one of a first determination condition that the charging plug is connected to the vehicle-side outlet and a second determination condition that the charging start operation is performed; The warning voice data includes information for urging the operator to open the battery cover.

[0009] In the cargo handling vehicle, a display including a display unit and an input unit; the control unit includes a third control unit that controls the display, the third control unit causes the display unit to display an ON / OFF setting screen for switching between an ON setting and an OFF setting of the determination condition; The second control unit can be configured to issue the playback instruction when the setting is ON, and not issue the playback instruction when the setting is OFF.

[0010] In the cargo handling vehicle, The third control unit can be configured to display a volume setting screen on the display unit for changing the volume of the warning audio data when it is played back in response to an input operation on the input unit, and to display a first volume input field on the volume setting screen for inputting the volume level.

[0011] In the cargo handling vehicle, the third control unit displays, on the volume setting screen, a time zone setting field for setting a time zone and a second volume input field for inputting the level of the volume; The second control unit can be configured to issue the playback instruction so that the warning audio data is played at a volume that is equal to or lower than the level entered in the second volume input field during the time period set in the time period setting field.

[0012] In the cargo handling vehicle, The charging operation unit a charging button that starts the charging immediately after being operated; a scheduled charging button for starting the charging at a preset time, the determination condition includes the second determination condition, The second determination condition may be configured to include whether the charging button has been operated or whether the scheduled charging button has been operated.

[0013] In the cargo handling vehicle, the display includes the charging operation unit, The third control unit can be configured to display a charge mode selection screen on the display unit that allows the operator to select a charge mode for the charging, and to display the charge button and the scheduled charge button on the charge mode selection screen. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a cargo handling vehicle that can prevent the battery cover from being left open during charging. [Brief explanation of the drawings]

[0015] [Figure 1] 1A is a diagram showing the forklift and charging device according to the present invention, FIG. 1B is a diagram showing the battery cover in an open state, and FIG. 1C is a diagram showing various buttons on a charging operation unit. [Figure 2] FIG. 2 is a block diagram of a first control unit according to the present invention. [Figure 3]FIG. 4 is a block diagram of a second control unit and a voice alert unit according to the present invention. [Figure 4] FIG. 3 is a diagram showing first to third control units and a display according to the present invention. [Figure 5] 10 is an example of a screen of a display when a set value of a control operation is changed. [Figure 6] 10 is an example of a screen of the display when the definition of a risky act is changed. [Figure 7] FIG. 2 is a diagram showing screens S101 to S108 of a display. [Figure 8] FIG. 10 is a diagram showing screens S109 to S116 of a display. [Figure 9] FIG. 10 is a diagram showing screens S117 to S122 of a display. [Figure 10] FIG. 10 is a diagram showing screens S123 to S130 of a display. [Figure 11] FIG. 10 is a diagram showing screens S131 to S136 of a display. [Figure 12] FIG. 10 is a diagram showing a screen S137 of the display. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a cargo handling vehicle according to the present invention will be described with reference to the accompanying drawings.

[0017] Fig. 1(A) shows a forklift 1 and a charging device 100 according to one embodiment of the present invention. The forklift 1 is a counterbalance type forklift equipped with a battery BT1, and corresponds to the "cargo handling vehicle" of the present invention. The forklift 1 travels and handles cargo in a predetermined work area.

[0018] The charging device 100 is configured to supply voltage to the forklift 1 and includes a power plug 101, a cable 102, and a charging plug 103. The power plug 101 is provided at the end of the cable 102 and is connected to an AC power outlet present in the work area. The charging plug 103 is provided at the end of the cable 102 and is connected to a vehicle-side outlet BT4, which will be described later. The charging device 100 supplies AC voltage from an external power source to the forklift 1.

[0019] The work area is, for example, an area within any building such as a factory or a warehouse. The work area is provided with a plurality of shelves, and the shelves store cargo (including pallets) to be carried by the forklift 1.

[0020] The forklift 1 includes an audio alert unit 2, a warning unit 3, and a display 4. The audio alert unit 2 issues an audio warning (audio alert) to the operator of the forklift 1 by playing back pre-stored audio data. The warning unit 3 issues a warning to the operator by means other than audio. The display 4 is configured to be operable by an operator (manager) or a serviceman (customer engineer). Details of the audio alert unit 2, warning unit 3, and display 4 will be described later.

[0021] The forklift 1 includes a vehicle body 10, a cargo handling device 20, a sensor unit 30, a first control unit 40, a second control unit 50, and a third control unit 60.

[0022] The vehicle body 10 includes a battery BT1, a battery storage section BT2, a battery cover BT3, a vehicle-side outlet BT4, and a charging operation section BT5.

[0023] Battery BT1 is a power source for the traveling operation of vehicle body 10 and the loading / unloading operation of loading device 20, and is composed of multiple battery cells. The power of battery BT1 is supplied to, for example, a traveling motor, a steering motor, and a loading / unloading motor, which will be described later. Battery BT1 in this embodiment is a lead battery, but it may also be a lithium-ion battery or other battery. Lead batteries generate hydrogen gas when charged. On the other hand, lithium-ion batteries do not generate hydrogen gas when charged.

[0024] The battery storage unit BT2 includes a case provided inside the vehicle body 10, and the battery BT1 is stored in the case. The battery storage unit BT2 has an opening through which the battery BT1 can be inserted and removed. The battery storage unit BT2 of this embodiment is provided below the driver's seat 13, which will be described later, and has an opening on the upper side.

[0025] The battery cover BT3 is configured to close the opening of the battery storage compartment BT2 when in the closed state and to open the opening of the battery storage compartment BT2 when in the open state. Figure 1(B) shows the battery cover BT3 in the open state. A driver's seat 13 is provided on one side of the battery cover BT3.

[0026] As shown in FIG. 1(A), the vehicle-side outlet BT4 is provided in front of the driver's seat 13. A charging plug 103 is connected to the vehicle-side outlet BT4. The vehicle-side outlet BT4 is connected to an on-board charger (not shown) provided inside the vehicle body 10. The on-board charger charges the battery BT1. For example, when a three-phase (R phase, S phase, T phase) AC voltage is input to the vehicle-side outlet BT4, the on-board charger converts this AC voltage to a DC voltage and supplies it to the battery BT1. Note that when a DC voltage is input to the vehicle-side outlet BT4 (when a stationary charging device that converts AC voltage to DC voltage is used instead of the charging device 100), the DC voltage is supplied to the battery BT1.

[0027] The charging operation unit BT5 is provided near the vehicle-side outlet BT4 and is configured to accept operations (charging start operation and charging stop operation) by the operator. As shown in FIG. 1(C), the charging operation unit BT5 has buttons that can be operated by the operator, including an automatic charging button BT51, a scheduled charging button BT52, an equalizing charging button BT53, and a stop button BT54. The automatic charging button BT51 and the equalizing charging button BT53 correspond to the "charging button" of the present invention, and the scheduled charging button BT52 corresponds to the "scheduled charging button" of the present invention. The arrangement of each of the buttons BT51 to BT54 can be changed as appropriate.

[0028] The automatic charging button BT51 is a button for causing the in-vehicle charger to start charging (automatic charging) the battery BT1. For example, when the automatic charging button BT51 is operated while the charging plug 103 is connected to the vehicle-side outlet BT4, the in-vehicle charger starts charging (automatic charging) the battery BT1 immediately after the operation.

[0029] The scheduled charging button BT52 is a button for causing the on-board charger to start charging the battery BT1 at a preset time. The on-board charger basically performs automatic charging as the charging, but may also perform equalized charging (described later) once every several times (for example, every 10 times).

[0030] The equalized charge button BT53 is a button for causing the on-board charger to start charging (equalized charging) the battery BT1 so that the voltages of the battery cells that make up the battery BT1 are equalized. For example, when the equalized charge button BT53 is operated while the charging plug 103 is connected to the vehicle-side outlet BT4, the on-board charger starts charging (equalized charging) the battery BT1 immediately after the operation.

[0031] The stop button BT54 is a button for causing the on-board charger to stop charging. For example, if the stop button BT54 is operated during charging, the on-board charger stops charging. Note that operating the stop button BT54 is an operation to stop charging, and operating the automatic charge button BT51, scheduled charge button BT52, and equal charge button BT53 is an operation to start charging.

[0032] The vehicle body 10 is equipped with a key switch for turning the power of the vehicle body 10 on and off. The key switch is configured to be operable by an operator and is switched between a key-on state and a key-off state by the operator's operation. When the key switch is in the key-on state, the battery BT1 supplies power supply voltage to the electrical system of the vehicle body 10 (e.g., the first control unit 40, the second control unit 50, the third control unit 60, and the display 4) directly or via a DC / DC converter provided in the vehicle body 10. When the key switch is in the key-off state, the battery BT1 does not supply power supply voltage. Note that a part of the electrical system (e.g., various controllers of the first control unit 40) may be constantly supplied with power supply voltage, and the second control unit 50 may be supplied with power supply voltage from a power source separate from the battery BT1. In this embodiment, the various controllers of the first control unit 40, the second control unit 50, the audio alert unit 2, and the warning unit 3 are constantly supplied with power supply voltage.

[0033] A pair of left and right front wheels 11 and rear wheels 12 are provided on the lower part of the vehicle body 10. In the forklift 1, the front wheels 11 are drive wheels driven by a traveling motor, and the rear wheels 12 are steered wheels steered (turned) by a steering motor.

[0034] An operator's seat 13 is provided at the top of the vehicle body 10. An accelerator 14 and a brake 15 are provided at the front lower part of the seat 13, and a display 4, a steering wheel 16, and a cargo handling operation unit 17 are provided on the dashboard in front of the seat 13.

[0035] The accelerator 14 is an accelerator pedal configured to be operable by the operator in the driver's seat 13. When the accelerator 14 is in an on state (pedal depressed), it accelerates the vehicle body 10 in accordance with the amount of depression of the pedal (accelerator opening), and when it is switched from the on state to an off state (pedal not depressed), it generates weak regenerative braking to decelerate the vehicle body 10.

[0036] The brake 15 is a brake pedal that can be operated by the operator in the driver's seat 13 by stepping on it with his / her foot. When the brake 15 is in the on state (pedal is depressed), it generates regenerative braking that is stronger than the regenerative braking of the accelerator 14, thereby decelerating the vehicle body 10, but when it is in the off state, it does not generate regenerative braking.

[0037] The handlebars 16 are connected to the rear wheels 12 via a steering control mechanism 42, which will be described later. By rotating the handlebars 16, the operator can change the direction (turning angle) of the rear wheels 12 according to the direction of rotation. When the handlebars 16 are not being rotated (when traveling straight), the turning angle of the rear wheels 12 is 0°.

[0038] The cargo handling operation unit 17 includes a lift lever and a tilt lever. The lift lever and the tilt lever are connected to the cargo handling device 20 via a cargo handling control mechanism 43, which will be described later. An operator can operate the cargo handling device 20 by operating the lift lever and the tilt lever.

[0039] A head guard 18 is provided on the upper part of the vehicle body 10 and above the driver's seat 13. The head guard 18 is made up of a pair of left and right front pillars, a pair of left and right rear pillars, and a roof.

[0040] The cargo handling device 20 includes a mast 21, a lift bracket 22, a fork 23, a backrest 24, a tilt cylinder 25, and a lift cylinder 26.

[0041] The mast 21 is provided at the front of the vehicle body 10 and raises and lowers the fork 23. The mast 21 comprises an outer mast and an inner mast. The outer mast comprises a pair of left and right guide rails extending vertically, and a cross beam connecting the upper ends of the guide rails. The inner mast rises and lowers along the guide rails of the outer mast at half the speed of the fork 23 and backrest 24. The outer mast does not rise or lower.

[0042] The lift bracket 22 supports the forks 23 and moves up and down along the mast 21. The forks 23 are a pair of left and right L-shaped arms and are provided on the front surface of the lift bracket 22. The forks 23 hold the cargo. The backrest 24 is a frame that prevents the cargo held by the forks 23 from tipping backward, and is provided on the upper part of the lift bracket 22. When the mast 21 (inner mast) moves up and down, the lift bracket 22, the forks 23, and the backrest 24 also move up and down.

[0043] The tilt cylinder 25 is a hydraulic cylinder for tilting the mast 21 (forks 23) in the forward and backward directions. In this embodiment, when the tilt lever is tilted forward, the tilt cylinder 25 extends and the mast 21 (forks 23) tilts forward, and when the tilt lever is tilted backward, the tilt cylinder 25 contracts and the mast 21 (forks 23) tilts backward. When the tilt lever is returned to the neutral position (a position that does not tilt the mast 21 either forward or backward), the tilting of the mast 21 (forks 23) stops.

[0044] The lift cylinder 26 is a hydraulic cylinder for raising and lowering the mast 21. In this embodiment, when the lift lever is tilted forward, the lift cylinder 26 contracts and the inner mast lowers, and when the lift lever is tilted backward, the lift cylinder 26 extends and the inner mast rises. When the lift lever is returned to the neutral position (a position where the inner mast is neither tilted forward nor backward), the raising and lowering of the inner mast stops.

[0045] The sensor unit 30 corresponds to a "monitoring unit" and includes a load sensor 31, a vehicle speed sensor 32, a turning angle sensor 33, an accelerator sensor 34, and a brake sensor 35. The measured values measured by the sensors 31 to 35 correspond to "monitoring target values."

[0046] The load sensor 31 measures the load of the cargo held by the forks 23. The load sensor 31 may be, for example, a pressure sensor that measures the presence or absence of a load from the pressure (hydraulic pressure) in the lift cylinder 26. The first control unit 40 and / or the second control unit 50 can calculate the value of the load based on the pressure (hydraulic pressure) value in the lift cylinder 26 measured by the pressure sensor. The vehicle speed sensor 32 measures the speed of the vehicle body 10. The vehicle speed sensor 32 may be, for example, a speed sensor that measures the traveling speed (vehicle speed) of the vehicle body 10 from the rotation speed and rotation direction of the travel motor. The turning angle sensor 33 measures the turning angle of the rear wheels 12. The turning angle sensor 33 may be, for example, an angle sensor that measures the turning angle of the rear wheels 12 from the rotation angle of the handlebars 16, or an angle sensor that measures the turning angle of the rear wheels 12 from the rotation angle of the pivot of the rear wheels 12. The accelerator sensor 34 measures the accelerator opening of the accelerator 14. The brake sensor 35 measures the state of the brake 15 (on state / off state).

[0047] The sensor unit 30 may include sensors other than the sensors 31 to 35. For example, the sensor unit 30 may include a sensor that measures the direction and amount of rotation of the steering wheel 16, or a sensor that measures the amount of operation of the cargo handling operation unit 17 (lift lever and tilt lever). The sensor unit 30 may also include a sensor that detects whether the operator has left the driver's seat 13, or a sensor provided in the driver's seat 13 that detects whether the seat belt is fastened or not. The sensor that detects whether the operator has left the seat is, for example, a pressure sensor or microswitch provided in the driver's seat 13, or an infrared sensor provided near the driver's seat 13. The seat belt sensor is, for example, a sensor that detects whether the seat belt is fastened or not by detecting whether the tongue plate of the seat belt is inserted into the buckle. The sensor unit 30 may also include a sensor that detects whether the key switch is in the key-on state or the key-off state, and the sensor outputs a detection signal to the first control unit 40, the second control unit 50, and / or the third control unit 60.

[0048] The first control unit 40 is provided inside the vehicle body 10 and controls the operation of the vehicle body 10. As shown in Fig. 2, the first control unit 40 includes a travel control mechanism 41, a steering control mechanism 42, a cargo handling control mechanism 43, and a warning control mechanism 44.

[0049] The cruise control mechanism 41 acquires signals related to measurement values (hereinafter referred to as measurement signals) from the sensor unit 30 and controls the front wheels 11, which are drive wheels. The cruise control mechanism 41 includes, for example, a cruise controller, a cruise inverter, a cruise motor, and a hydraulic circuit. The cruise control mechanism 41 acquires the vehicle speed of the vehicle body 10 based on the measurement signal from the vehicle speed sensor 32, and calculates a target speed based on the measurement signal from the accelerator sensor 34 and / or the measurement signal from the brake sensor 35. The cruise control mechanism 41 performs PI control or PID control to bring the vehicle speed closer to the target speed. The target speed is calculated, for example, using the formula: target speed = set speed x accelerator opening [%]. The set speed is a speed that is preset in the cruise controller.

[0050] The steering control mechanism 42 acquires measurement signals relating to the direction and amount of rotation of the steering wheel 16 from the sensor unit 30, and controls the rear wheels 12, which are steered wheels. The steering control mechanism 42 may acquire measurement signals from a turning angle sensor 33. The steering control mechanism 42 includes, for example, a steering motor, a power steering device, a hydraulic circuit, etc.

[0051] The cargo handling control mechanism 43 acquires measurement signals from the cargo handling operation unit 17 (lift lever and tilt lever) via the sensor unit 30 and controls the cargo handling device 20. The cargo handling control mechanism 43 includes, for example, a cargo handling controller, a cargo handling inverter, a cargo handling motor, a hydraulic circuit, etc.

[0052] The warning control mechanism 44 acquires a measurement signal from the sensor unit 30 and controls the warning unit 3. The warning control mechanism 44 includes a warning controller configured with a digital circuit such as a microcomputer. The warning control mechanism 44 sets a setting value for the control operation of the warning unit 3, and when the measurement value of the sensor unit 30 exceeds the setting value, outputs a warning instruction to the warning unit 3 to cause the warning unit 3 to issue a warning.

[0053] The warning unit 3 includes, for example, a stack light that emits visible light as a warning to the operator, and a buzzer that emits a sound other than voice (buzzer sound) as a warning to the operator. For example, the warning control mechanism 44 sets a set value for the vehicle speed and a set value for the load, and causes the stack light and / or the buzzer to issue a warning when the measurement value of the sensor unit 30 exceeds the set value (in the case of excessive vehicle speed or excessive load). Note that the warning unit 3 may issue a warning when a dangerous behavior defined by the second control unit 50 occurs.

[0054] 3 shows a block diagram of the second control unit 50 and the audio alert unit 2. The second control unit 50 sets a definition of a dangerous act, and instructs the audio alert unit 2 to play warning audio data when the definition is met.

[0055] The second control unit 50 includes, for example, a data logger unit (DLU) and is provided on the front pillar of the head guard 18. The second control unit 50 includes an input unit 51, a storage unit 52, a processing unit 53, and an output unit 54. The second control unit 50 is configured to be able to communicate with an external device (for example, a personal computer provided outside the forklift 1), and can update multiple pieces of dangerous act data, which will be described later, by communicating with the external device.

[0056] The input unit 51 acquires the measurement signal of the sensor unit 30. Information relating to the measurement signal acquired by the input unit 51 is output to the storage unit 52 and / or the processing unit 53.

[0057] The storage unit 52 stores a plurality of pieces of risky behavior data. The risky behavior data is data in which definitions of risky behaviors are set (for example, first data, which will be described later). The storage unit 52 also stores data for changing part of the definitions of risky behaviors (for example, second data, which will be described later).

[0058] The definition of a dangerous act is, for example, a unique dangerous act ID (hereinafter referred to as ID), the name of the dangerous act, and the criteria for determining the dangerous act, all of which are linked together. The definition of a dangerous act may include restricted acts of traveling and / or loading and unloading. Note that the structure of the dangerous act data is the same as the structure of the dangerous act data described in Patent Document 2, which was explained in the background art, and therefore a detailed explanation will be omitted here.

[0059] The storage unit 52 of this embodiment includes, as the risky behavior data, first data relating to a warning for forgetting to open the cover, and second data relating to an audio alert volume and a volume limit warning as data for changing (limiting) the volume when the warning audio data is played back.

[0060] In this embodiment, the volume is set to seven levels: level 0 (displayed as "--" on the display 4) and levels 1 to 6, where 0 means the volume is zero and the higher the number from 1 to 6, the higher the volume. The operator can change the volume level on the display 4. Note that changing the volume level is simply referred to as changing the volume.

[0061] The first data is, for example, a link between ID = "001", the name of the dangerous act = "Cover forgotten to open warning", and a judgment condition (first judgment condition) = "Charging plug 103 is connected to vehicle-side outlet BT4". Note that the vehicle-side outlet BT4 and charging plug 103 are provided with pins for connection confirmation, and by detecting the voltage applied to the pins, for example, the first control unit 40 and / or the second control unit 50 can recognize that charging plug 103 is connected to the vehicle-side outlet BT4.

[0062] The above-mentioned determination condition may be replaced with a second determination condition = "a charging start operation has been performed (for example, charging operation unit BT5 has accepted a charging start operation)" instead of the first determination condition, or may be a third determination condition (the first determination condition and the second determination condition). The third determination condition is "charging plug 103 has been connected to vehicle-side outlet BT4 or a charging start operation has been performed," and an audio alert is issued when the first determination condition is met, and also when the second determination condition is met.

[0063] The second data is data for limiting the volume. The second data includes information regarding an ON / OFF setting for limiting the volume, information regarding the volume during normal operation (when set to OFF), information regarding the volume during volume restriction (when set to ON), and information regarding the time period during which the volume restriction is performed. The operator can change the ON / OFF setting, the volume, and the time period on the display 4. In the second data of this embodiment, the volume during playback of each warning audio data is set to a common level, but it may also be set to a different level depending on the content of the warning audio data (i.e., depending on the dangerous behavior).

[0064] In this embodiment, the ID is a number, but the ID may be a letter or a symbol, or a combination of letters, symbols, and numbers. The name of the dangerous act is also an example, and can be set as appropriate.

[0065] The processing unit 53 determines whether the definition (determination condition) of each risky act is satisfied based on the measurement signal of the sensor unit 30 input to the input unit 51, and identifies risky act data that satisfies the definition. The processing unit 53 also includes a timer circuit for acquiring the current time, and identifies the time period during which volume restriction is to be implemented and the volume level.

[0066] If the definition of a dangerous act is met, the output unit 54 instructs the audio alert unit 2 to play audio data. Specifically, the output unit 54 transmits a first signal related to the ID and volume of the dangerous act data identified by the processing unit 53 (or the limited volume if a volume limit is imposed) to the audio alert unit 2. The output unit 54 also transmits a second signal related to the restricted act linked to the ID as a restriction instruction to the first control unit 40. The restriction instruction is, for example, to stop the traveling operation of the vehicle main body 10 and / or stop the loading operation of the loading device 20. The timing of transmitting the first signal (playback instruction) and the second signal (restriction instruction) may be the same or different.

[0067] The audio alert unit 2 issues an audio warning (audio alert) upon receiving a playback instruction from the second control unit 50. The audio of the present invention is audio including linguistic audio that can convey information to the operator. The audio alert unit 2 is provided, for example, below the roof of the head guard 18. The audio alert unit 2 includes an audio data storage unit 2A, an audio data processing unit 2B, and a speaker 2C.

[0068] The voice data storage unit 2A stores a plurality of voice data in which data of a warning voice (warning voice data) is linked to an ID. Note that the configuration of the voice data is the same as the configuration of the voice data described in Patent Document 2 explained in the background art, and therefore a detailed explanation will be omitted here.

[0069] The voice data storage unit 2A of this embodiment stores, as voice data, first voice data corresponding to the first data. The first voice data is, for example, a combination of ID=“001” and warning voice data=“Please open the battery cover.” In this way, the first voice data includes information (voice) for urging the operator to open the battery cover BT3.

[0070] The audio data processing unit 2B acquires the first signal output from the output unit 54 and plays back the warning audio data linked to the ID of the first signal in the audio data storage unit 2A at the volume specified in the first signal. The audio data processing unit 2B includes, for example, a voice player module.

[0071] The speaker 2C is connected to the audio data processing unit 2B and outputs the sound of the warning audio data being reproduced by the audio data processing unit 2B. The speaker 2C can adjust the volume of the sound under the control of the second control unit 50. That is, the speaker 2C can output the sound at the volume specified by the first signal.

[0072] FIG. 4 shows the relationship between the third control unit 60 and the display 4. The third control unit 60 is provided inside the vehicle body 10 and controls the display 4. The third control unit 60 is configured with a digital circuit such as a microcomputer. The third control unit 60 displays a setting screen on the display 4 for changing and / or disabling the definition of a dangerous act, and changes and / or disabling the definition in response to an input operation on the display 4. Similarly, the third control unit 60 displays a setting screen on the display 4 for changing and / or disabling the setting value of the control operation for the warning unit 3, and changes and / or disabling the setting value in response to an input operation on the display 4. Note that changing the definition of a dangerous act includes changing the volume within a range of 1 to 6, and disabling the definition of a dangerous act includes changing the volume to 0.

[0073] The display 4 is provided on the dashboard of the vehicle body 10 and includes a display unit 4A and an input unit 4B. The display 4 is, for example, a liquid crystal display, and the display unit 4A and the input unit 4B are, for example, liquid crystal screens controlled by the third control unit 60.

[0074] The display unit 4A displays, for example, a screen including a menu area A1 and a submenu area A2. One item is displayed in the menu area A1, and multiple (three in this embodiment) sub-items and a cursor are displayed in the submenu area A2.

[0075] The input unit 4B includes various switches B1 to B4. In this embodiment, switch B1 is a switch marked "OK" and is used to confirm a selected item or fix a setting. Switch B2 is a switch marked "C" and is used to return to the previous screen. Switch B3 is a switch marked "▲" and is used to move the cursor up or increase a numerical value. Switch B4 is a switch marked "▼" and is used to move the cursor down or decrease a numerical value. Note that the various switches B1 to B4 may be physical switches.

[0076] In the forklift 1 according to this embodiment, the definition of a dangerous act can be changed and / or invalidated on the display 4 without changing the software for the audio alert (for example, software for updating multiple pieces of dangerous act data stored in the storage unit 52). Therefore, the forklift 1 according to this embodiment can significantly reduce the number of times the software for the audio alert needs to be changed.

[0077] FIG. 5 shows a screen displayed on the display unit 4A for changing or disabling the set value of the control operation (speed warning) for the warning unit 3.

[0078] The control operation (speed warning) is an operation in which, when the vehicle speed (measured value) of the vehicle body 10 exceeds a set value, the warning control mechanism 44 of the first control unit 40 issues a warning instruction to the warning unit 3. Upon receiving the warning instruction, the warning unit 3 emits, for example, a buzzer sound.

[0079] Screen S1 displayed on display unit 4A is an administrator setting screen. The administrator setting screen is a screen that can be operated, for example, by an operator (administrator) with predetermined authority. On screen S1, an "Administrator Setting" item is displayed in menu area A1, sub-items including "Speed Warning" are displayed in sub-menu area A2, and the cursor is positioned on "Speed Warning." When switch B1 is operated in this state, third control unit 60 causes screen S2 to be displayed on display unit 4A. Furthermore, when switch B2 is operated while screen S2 is displayed, third control unit 60 causes display unit 4A to display screen S1, which is the previous screen.

[0080] On screen S2, the "Speed Warning" item is displayed in menu area A1, and a setting value area A3 is displayed in place of submenu area A2. A numerical input field for inputting a setting value is displayed in setting value area A3, with the range of values that can be input displayed below it. The setting value can be increased or decreased within the range of 1 to 15 km / h by operating switches B3 and B4. By operating switches B3 and B4 and entering "--" in the numerical input field, the setting value is invalidated and no warning is issued (no buzzer sound is generated).

[0081] In this embodiment, the setting value of the control operation (speed warning) is linked to the threshold value of the dangerous behavior (overspeeding). The dangerous behavior (overspeeding) is an behavior in which the vehicle speed (measured value) of the vehicle body 10 exceeds a threshold value, and the threshold value is a vehicle speed value included in the judgment conditions of the dangerous behavior data. When the vehicle speed exceeds the threshold value, the second control unit 50 instructs the audio alert unit 2 to play. Upon receiving the playback instruction, the audio alert unit 2 issues an audio alert.

[0082] When the set value of the control operation (speed warning) is changed or disabled by an input operation, the third control unit 60 issues a change instruction to change or disable the threshold value of the dangerous act (excessive speeding) in conjunction with the changed set value. Upon receiving the change instruction, the second control unit 50 changes or disables the threshold value of the dangerous act (excessive speeding) in conjunction with the set value of the control operation (speed warning).

[0083] The second control unit 50 of this embodiment changes the set value of the control operation (speed warning) and the threshold value of the dangerous act (excessive speeding) so that they are the same value. As a result, when the vehicle speed (measured value) of the vehicle body 10 exceeds the set value, the warning unit 3 emits a buzzer sound and the audio alert unit 2 issues an audio alert. When the set value is disabled, the warning unit 3 does not emit a buzzer sound and the audio alert unit 2 does not issue an audio alert.

[0084] As described above, the threshold value for the risky act is changed or invalidated in conjunction with the set value of the control operation, so there is no need to change or invalidate the set value and the threshold value separately. As a result, the time required for the change or invalidation can be reduced. Note that if the default set value and the default threshold value are different, instead of changing the set value and the threshold value to be the same, the amount of increase or decrease in the set value and the amount of increase or decrease in the threshold value may be made the same.

[0085] The above describes the set value of the control operation (speed warning) and the threshold value of the dangerous act (excessive speeding), but the set value of another control operation may be linked and linked to the threshold value of another dangerous act as long as the object being monitored by the sensor unit 30 is the same. For example, by linking the set value of the control operation (excessive load) with the threshold value of the dangerous act (excessive load) (for example, by making the set value and the threshold value the same), when the load is exceeded, the warning unit 3 may emit a buzzer sound and the audio alert unit 2 may give an audio alert.

[0086] 6 shows screens S11 to S14 that are displayed on the display unit 4A and are used to change or invalidate the definition of a risky act. On screens S11 to S14, operating switch B1 advances to the next screen, and operating switch B2 returns to the previous screen.

[0087] On the screen S11, the menu area A1 displays the item "Administrator Settings," and the sub-menu area A2 displays sub-items including "Riskful Action Determination," with the cursor positioned on "Riskful Action Determination."

[0088] On screen S12, the menu area A1 displays the item "Riskful Action Determination," and the sub-menu area A2 displays sub-items "Riskful Action 1" to "Riskful Action 3," with the cursor positioned on "Riskful Action 1." "Riskful Action 1" to "Riskful Action 3" are, for example, the names of risky actions included in the definition of risky actions. On screen S12, by operating switch B4, "Riskful Action 4" and onward can be displayed. Note that the sub-items on screen S12 from "Riskful Action 1" onward may be displayed on screen S11 instead of "Riskful Action Determination."

[0089] Screen S13 corresponds to the "ON / OFF setting screen" of the present invention. On screen S13, the item "Dangerous Action 1" is displayed in menu area A1, and an ON / OFF setting area A4 is displayed instead of submenu area A2. "ON", "OFF", and a cursor are displayed in ON / OFF setting area A4, and "ON" or "OFF" can be selected by moving the cursor by operating switches B3 and B4. When "Dangerous Action 1" is set to "ON", the second control unit 50 enables the definition of "Dangerous Action 1" and issues a playback command to the audio alert unit 2 when the definition (the judgment condition included in the definition) is satisfied. On the other hand, when "Dangerous Action 1" is set to "OFF", the second control unit 50 disables the definition of "Dangerous Action 1" and does not issue a playback command to the audio alert unit 2.

[0090] On screen S14, the menu area A1 displays the item "Risky Act 1," and the threshold area A5 is displayed instead of the submenu area A2. The threshold area A5 displays a numerical input field for inputting a threshold value, with a reference value displayed below it. The threshold value can be increased or decreased within a predetermined numerical range by operating switches B3 and B4. Instead of displaying the previous screen, screen S13, it is also possible to input "--" into the numerical input field on screen S14, and to invalidate the threshold by inputting "--." If the threshold for "Risky Act 1" is invalidated, the definition of "Risky Act 1" is invalidated.

[0091] The reference value displayed in the threshold area A5 is the same monitored value as the threshold, for example, the maximum monitored value within a predetermined time period including the occurrence of risky behavior 1. When "risky behavior 1" is speeding, the second control unit 50 stores the vehicle speed measured by the sensor unit 30 from the occurrence of the speeding until a predetermined time period (for example, 5 minutes) has elapsed, and identifies the maximum vehicle speed. The third control unit 60 displays the maximum vehicle speed as a reference value in the threshold area A5.

[0092] When the threshold value for "Risky Act 1" is changed or invalidated by an input operation, the third control unit 60 issues a change instruction to change or invalidate the threshold value for "Risky Act 1." Upon receiving the change instruction, the second control unit 50 changes or invalidates the threshold value for "Risky Act 1."

[0093] 7 to 11 show screens S101 to S136 displayed on the display unit 4A for changing or invalidating the definition of other risky acts. Note that in Figure 7 and subsequent figures, the reference value (e.g., the maximum value of the previous measurement value) displayed in the threshold area A5 is omitted.

[0094] [Sudden turn warning] Screens S101 and S102 are screens for changing or disabling the definition of a dangerous act (sudden turn warning). The definition of a dangerous act (sudden turn warning) includes the following judgment condition for a sudden turn warning: "The turning angle (left turning angle or right turning angle) of the rear wheels 12 exceeds the limit start angle [°], and the vehicle speed exceeds the vehicle speed limit value [km / h]." When this definition (judgment condition) is met, the audio alert unit 2 plays warning audio data stating "A sharp turn has been detected" as an audio alert.

[0095] On screen S101, the menu area A1 displays the "Administrator Settings" item, and sub-menu area A2 displays sub-items including "Sudden Turn Warning," with the cursor positioned on "Sudden Turn Warning." On screen S102, the menu area A1 displays the "Sudden Turn Warning" item, and threshold area A5 displays a numerical input field and numerical range. The numerical input field is used to input an increase or decrease value [km / h] in the vehicle speed limit value as a threshold. The threshold value can be increased or decreased by operating switches B3 and B4, and entering "--" in the numerical input field disables the setting and results in no playback command.

[0096] When the threshold value (the increase / decrease value of the vehicle speed limit value) is changed or invalidated by an input operation, the third control unit 60 issues a change instruction to change or invalidate the vehicle speed limit value. Upon receiving the change instruction, the second control unit 50 changes or invalidates the vehicle speed limit value for the sudden turn warning.

[0097] [Sudden acceleration / deceleration warning] Screens S103 and S104 are screens for collectively changing or invalidating the definitions of the dangerous actions (sudden acceleration while moving forward, sudden acceleration while moving backward, sudden deceleration while moving forward, and sudden deceleration while moving backward). The definition of the dangerous action (sudden acceleration while moving forward) includes the judgment condition "accelerating by more than a first threshold value [km / h / s] per second while moving forward," and the definition of the dangerous action (sudden acceleration while moving backward) includes the judgment condition "accelerating by more than a second threshold value [km / h / s] per second while moving backward." The definition of the dangerous action (sudden deceleration while moving forward) includes the judgment condition "deceleration by more than a third threshold value [km / h / s] per second while moving forward," and the definition of the dangerous action (sudden deceleration while moving backward) includes the judgment condition "deceleration by more than a fourth threshold value [km / h / s] per second while moving backward." If any of the definitions (judgment conditions) is satisfied, the audio alert unit 2 during sudden acceleration plays warning audio data saying "Sudden acceleration has been detected" as an audio alert, and the audio alert unit 2 during sudden deceleration plays warning audio data saying "Sudden deceleration has been detected" as an audio alert.

[0098] On screen S103, the menu area A1 displays an "Administrator Settings" item, and the submenu area A2 displays submenus including "Sudden Acceleration / Deceleration Warning." The cursor is positioned on "Sudden Acceleration / Deceleration Warning." On screen S103, dangerous actions (sudden acceleration while moving forward, sudden acceleration while moving backward, sudden deceleration while moving forward, and sudden deceleration while moving backward) are collectively displayed as "Dangerous Actions (Sudden Acceleration / Deceleration Warning)." On screen S104, the menu area A1 displays the "Sudden Acceleration / Deceleration Warning" item, and the threshold area A5 displays a numerical input field and a numerical range. A common threshold [km / h / s] for the first, second, third, and fourth thresholds is input into the numerical input field. The common threshold is an absolute value of acceleration, and its value can be increased or decreased by operating switches B3 and B4. When "--" is input into the numerical input field by operating switches B3 and B4, the common threshold is disabled, and no regeneration command is issued.

[0099] When the common threshold is changed or invalidated by an input operation, the third control unit 60 issues a change instruction to change or invalidate the first threshold, the second threshold, the third threshold, and the fourth threshold all at once. Upon receiving the change instruction, the second control unit 50 changes or invalidates the first threshold, the second threshold, the third threshold, and the fourth threshold included in each definition all at once.

[0100] [Sudden reversal warning] Screens S105 and S106 are screens for enabling or disabling the definition of dangerous behavior (sudden reversal warning). The definition of dangerous behavior (sudden reversal warning) includes a condition for determining the sudden reversal warning: "The time during which the vehicle speed when reversing forward or backward is equal to or less than the speed limit [km / h] is less than a first time [s]." If this definition (determination condition) is met, the audio alert unit 2 plays warning audio data saying, "Please pause and then reverse" as an audio alert.

[0101] The forward / reverse reversal operation is an operation that occurs, for example, when the accelerator 14 is left on and the forward / reverse lever located in front of the driver's seat 13 is switched from a position tilted forward (forward position) to a position tilted backward (reverse position), or when it is switched from the reverse position to the forward position.

[0102] On screen S105, the item "Administrator Settings" is displayed in menu area A1, and sub-items including "Sudden Reverse Warning" are displayed in sub-menu area A2, with the cursor positioned on "Sudden Reverse Warning." On screen S106, the item "Sudden Reverse Warning" is displayed in menu area A1, and "ON," "OFF," and the cursor are displayed in ON / OFF setting area A4.

[0103] When "ON" is set on screen S106, the second control unit 50 enables the definition of the dangerous act (sudden reversal warning) and issues a playback instruction to the audio alert unit 2 when the definition is met. On the other hand, when "OFF" is set on screen S106, the second control unit 50 disables the definition of the dangerous act (sudden reversal warning) and does not issue a playback instruction to the audio alert unit 2. Note that instead of displaying the ON / OFF setting area A4 on screen S106, a threshold area A5 for changing or disabling (no playback instruction) the speed limit [km / h] may be displayed.

[0104] [Loaded load] Screens S107 and S108 are screens for collectively changing the load threshold for multiple dangerous actions whose definitions include the load threshold [kg]. The multiple dangerous actions include, for example, excessive load, a warning about simultaneous operation while traveling, and a warning about simultaneous operation while loading and unloading, which will be described later. For example, when the definition of excessive load is met, the audio alert unit 2 plays warning audio data saying "Excessive load" as an audio alert.

[0105] On screen S107, the menu area A1 displays the item "Administrator Settings," and sub-menu area A2 displays sub-items including "Loaded Load," with the cursor positioned on "Loaded Load." On screen S107, multiple dangerous actions that include a load threshold in their definition are displayed together as "Dangerous Actions (Loaded Load)." On screen S108, the menu area A1 displays the item "Loaded Load," and threshold area A5 displays a numeric input field and a numeric range. The numeric value of the load threshold is entered in the numeric input field. The numeric value of the load threshold can be increased or decreased in increments of a predetermined amount (for example, 10 kg) by operating switches B3 and B4.

[0106] When the load threshold is changed by an input operation, the third control unit 60 issues a change instruction to collectively change the load thresholds included in the definitions of multiple risky actions. Upon receiving the change instruction, the second control unit 50 collectively changes the load thresholds included in the definitions of multiple risky actions.

[0107] [Driving and simultaneous operation warning] Screens S109 and S110 are screens for changing or disabling the definition of the dangerous act (warning for simultaneous operation while traveling). The definition of the dangerous act (warning for simultaneous operation while traveling) includes "during loading and unloading operations" as a judgment condition (condition for simultaneous operation while traveling) for the warning for dangerous act (warning for simultaneous operation while traveling). In this embodiment, the loading and unloading operations include the raising and lowering of the forks 23, and the traveling operations include traveling with turning (forward or reverse) and traveling without turning (forward or reverse), so there are four definitions of the dangerous act (warning for simultaneous operation while traveling). If any of the definitions (judgment conditions) is met, the audio alert unit 2 plays warning audio data saying "Do not perform simultaneous operations" as an audio alert.

[0108] On screen S109, the menu area A1 displays an "Administrator Settings" item, and sub-menu area A2 displays sub-items including "Driving Simultaneous Operation Warning," with the cursor positioned on "Driving Simultaneous Operation Warning." On screen S110, the menu area A1 displays the "Driving Simultaneous Operation Warning," and a condition setting area A6 is set. A condition selection field is displayed in the condition setting area A6, and various conditions that can be selected by operating switches B3 and B4 are displayed in the condition selection field. The various conditions include "Always," "Loaded," "Turning," "Turning with Loaded," and "OFF." Note that the above various conditions may also include "Exceeding Vehicle Speed Limit."

[0109] The third control unit 60 issues a change instruction to change or disable the definition of the dangerous act (driving simultaneous operation warning) according to the selected condition. The second control unit 50, upon receiving the change instruction, changes or disables the definition of the dangerous act (driving simultaneous operation warning). For example, if "Always" is selected, the second control unit 50 issues a playback instruction to the audio alert unit 2 when any of the four definitions of the dangerous act (driving simultaneous operation warning) is met. If "Loaded" is selected, the second control unit 50 adds a load threshold condition to the above definition. The load threshold can be changed on the screen S108. If "Turning" is selected, the second control unit 50 adds a turning angle condition to the above definition. This limits the driving operation to driving operation with turning. If "Turning with Load" is selected, the second control unit 50 adds a load threshold condition and a turning angle condition to the above definition. If "OFF" is selected, the second control unit 50 disables the above definition and does not issue a playback instruction.

[0110] [Simultaneous cargo handling operation warning] Screens S111 and S112 are screens for changing or disabling the definition of a dangerous act (simultaneous cargo-handling operation warning). The definition of a dangerous act (simultaneous cargo-handling operation warning) includes "multiple cargo-handling operations in progress" as a judgment condition (simultaneous cargo-handling operation condition) for a simultaneous cargo-handling operation warning. Multiple cargo-handling operations are two or more different cargo-handling operations, such as tilting the mast 21 and raising and lowering the forks 23. When the definition (judgment condition) is met, the audio alert unit 2 plays warning audio data saying "Do not perform simultaneous operations" as an audio alert.

[0111] On screen S111, the "Administrator Settings" item is displayed in menu area A1, and sub-items including "Simultaneous Loading Operation Warning" are displayed in sub-menu area A2, with the cursor positioned on "Simultaneous Loading Operation Warning." On screen S112, the "Simultaneous Loading Operation Warning" item is displayed in menu area A1, and condition setting area A6 is set. The condition selection field in condition setting area A6 displays various conditions that can be selected by operating switches B3 and B4. The various conditions include "Always," "Load Present," and "OFF." These conditions are the same as those for the simultaneous loading and unloading operation warning.

[0112] The third control unit 60 issues a change instruction to change or disable the definition of the dangerous act (simultaneous loading and unloading operation warning) according to the selected condition. The second control unit 50, upon receiving the change instruction, changes or disables the definition of the dangerous act (simultaneous loading and unloading operation warning). For example, if "Always" is selected, the second control unit 50 issues a playback instruction to the audio alert unit 2 when the above definition is met. If "Loaded" is selected, the second control unit 50 adds a load threshold condition to the above definition. If "OFF" is selected, the second control unit 50 disables the above definition and does not issue a playback instruction.

[0113] [Turning warning during claw removal] Screens S113 and S114 are screens for enabling or disabling the definition of a dangerous act (turning warning while removing claws). The definition of a dangerous act (turning warning while removing claws) includes "removing claws and turning" as a determination condition for the turning warning while removing claws. When this definition (determination condition) is met, the audio alert unit 2 plays warning audio data saying "Do not turn, claws are being removed" as an audio alert.

[0114] The second control unit 50 determines that the forks 23 are being removed when, for example, "the load is less than a fifth threshold value [kg] and the distance traveled backward by the vehicle body 10 from the time the load became less than the fifth threshold value is within a predetermined first distance [m]." The fifth threshold value is set separately from the load threshold value and is set to a value that can distinguish between a loaded state and an unloaded state. The first distance is set to a value that can determine whether the forks 23 have completely removed from the pallet containing the load. The second control unit 50 also determines that the forks 23 are being removed when, for example, "the turning angle of the rear wheels 12 is equal to or greater than a predetermined first angle [°]." The first angle can be set to any value greater than 0 [°].

[0115] On screen S113, the item "Administrator Settings" is displayed in menu area A1, and sub-items including "Turn Warning During Claw Removal" are displayed in sub-menu area A2, with the cursor positioned on "Turn Warning During Claw Removal." On screen S114, the item "Turn Warning During Claw Removal" is displayed in menu area A1, and "ON," "OFF," and the cursor are displayed in ON / OFF setting area A4.

[0116] When "ON" is set on the screen S114, the second control unit 50 enables the definition of the dangerous action (turning warning while removing claws) and issues a playback instruction to the audio alert unit 2 when the definition is met. On the other hand, when "OFF" is set on the screen S114, the second control unit 50 disables the definition of the dangerous action (turning warning while removing claws) and does not issue a playback instruction to the audio alert unit 2. Note that instead of displaying the ON / OFF setting area A4 on the screen S114, a threshold area A5 for changing at least one of the fifth threshold, the first distance, and the first angle may be displayed.

[0117] [Warning when driving other than backward leaning] Screens S115 and S116 are screens for changing or disabling the definition of dangerous behavior (warning for driving in a manner other than leaning backward). The definition of dangerous behavior (warning for driving in a manner other than leaning backward) includes a judgment condition for warning for driving in a manner other than leaning backward, which is "driving with the forks 23 tilted forward, or driving with the forks 23 horizontal." When this definition (judgment condition) is met, the audio alert unit 2 plays warning audio data as an audio alert saying, "Lean backward, you are driving."

[0118] On screen S115, the menu area A1 displays the "Administrator Settings" item, and sub-menu area A2 displays sub-items including "Warning when driving other than leaning backward," with the cursor positioned on "Warning when driving other than leaning backward." On screen S116, the menu area A1 displays the "Warning when driving other than leaning backward" item, and condition setting area A6 is set. The condition selection field in condition setting area A6 displays various conditions that can be selected by operating switches B3 and B4. The various conditions include "Always," "Loaded," and "OFF." These conditions are the same as those for the warning when operating while driving.

[0119] The third control unit 60 issues a change instruction to change or disable the definition of dangerous behavior (warning for driving other than leaning backward) depending on the selected condition. The second control unit 50, upon receiving the change instruction, changes or disables the definition of dangerous behavior (warning for driving other than leaning backward). For example, if "Always" is selected, the second control unit 50 issues a playback instruction to the audio alert unit 2 when the above definition is met. If "Loaded" is selected, the second control unit 50 adds a load threshold condition to the above definition. If "OFF" is selected, the second control unit 50 disables the above definition and does not issue a playback instruction.

[0120] [Non-level lift warning] Screens S117, S118, and S118' are screens for changing or disabling the definition of a dangerous act (non-level lift warning). The definition of a dangerous act (non-level lift warning) includes the following conditions for determining a non-level lift warning: "The forks 23 are ascending with their tilted forward position, the forks 23 are ascending with their tilted backward position, the forks 23 are descending with their tilted forward position, or the forks 23 are descending with their tilted backward position." When the definition (determination condition) is met, the audio alert unit 2 plays warning audio data saying, "Please keep the forks level. A lift operation is in progress."

[0121] On screen S117, the menu area A1 displays an "Administrator Settings" item, and submenu area A2 displays submenus including "Non-Level Lift Warning," with the cursor positioned on "Non-Level Lift Warning." On screen S118, the menu area A1 displays an "Non-Level Lift Warning - Up" item, and condition setting area A6 is set. Various conditions selectable by operating switches B3 and B4 are displayed in the condition selection field of condition setting area A6. The various conditions include "Always," "Loaded," and "Off," which are the same as those for the simultaneous operation while traveling warning, as well as "Loaded, leaning forward" and "No load." On screen S118', the menu area A1 displays an "Non-Level Lift Warning - Down" item, and condition setting area A6 is set. The various conditions selectable in condition setting area A6 are the same as those on screen S118.

[0122] In this embodiment, the definition of "rising with the forks 23 tilted forward, rising with the forks 23 tilted backward" can be changed or invalidated on the screen S118, and the definition of "descending with the forks 23 tilted forward, and descending with the forks 23 tilted backward" can be changed or invalidated on the screen S118'. Note that the definition of dangerous acts (non-level lift warning) may be changed or invalidated on a single screen.

[0123] The third control unit 60 issues a change instruction to change or disable the definition of the dangerous act (unlevel lift warning) depending on the selected condition. The second control unit 50, upon receiving the change instruction, changes or disables the definition of the dangerous act (unlevel lift warning). For example, if "Always" is selected, the second control unit 50 issues a playback instruction to the audio alert unit 2 when the above definition is met. If "Loaded" or "No Load" is selected, the second control unit 50 adds a load threshold condition to the above definition ("Loaded" requires the load threshold to be exceeded, and "No Load" requires the load to be equal to or less than the load threshold). If "Loaded and Leaning Forward" is selected, the second control unit 50 adds a load threshold condition (exceeding the load threshold) to the above definition and also adds a condition that the fork 23 is in a forward leaning state. If "OFF" is selected, the second control unit 50 disables the above definition and does not issue a playback instruction. That is, when "OFF" is selected on screen S118, the second control unit 50 disables part of the definition "The forks 23 are ascending while tilted forward, and the forks 23 are ascending while tilted backward," and issues a playback instruction when the forks 23 are descending while tilted forward or when the forks 23 are descending while tilted backward. When "OFF" is selected on screen S118', the second control unit 50 disables part of the definition "The forks 23 are descending while tilted forward, and the forks 23 are descending while tilted backward," and issues a playback instruction when the forks 23 are ascending while tilted forward or when the forks 23 are ascending while tilted backward.

[0124] [Nails left behind warning] Screens S119 and S120 are screens for enabling or disabling the definition of a dangerous action (nail down warning). The definition of a dangerous action (nail down warning) includes "load applied when key is off" as a judgment condition for the nail down warning. When this definition (judgment condition) is met, audio alert unit 2 plays warning audio data saying "Have you forgotten to lower the nail?" as an audio alert.

[0125] The second control unit 50 determines that the conditions for issuing a pawl-down warning are met when the key switch is in the key-off state and the load exceeds the sixth threshold. The sixth threshold is set separately from the load threshold and is set to a value that can distinguish between a loaded state and an unloaded state, similar to the fifth threshold, or a value that can distinguish between a state in which the forks 23 are on the ground and a state in which the forks 23 are not on the ground. For example, if the load when the forks 23 are not on the ground but are unloaded is set to 0 kg, the load when the forks 23 are on the ground but are unloaded will be a negative value, so the sixth threshold is set to a value that is greater than the negative value and less than 0, which is the load when the forks 23 are not on the ground but are unloaded.

[0126] On screen S119, the "Administrator Settings" item is displayed in menu area A1, and sub-items including "Nails Forgotten to Lower Warning" are displayed in sub-menu area A2, with the cursor positioned on "Nails Forgotten to Lower Warning." On screen S120, the "Nails Forgotten to Lower Warning" item is displayed in menu area A1, and "ON," "OFF," and the cursor are displayed in ON / OFF setting area A4.

[0127] When "ON" is set on screen S120, the second control unit 50 enables the definition of the dangerous action (nail down warning) and issues a playback instruction to the audio alert unit 2 when the definition is met. On the other hand, when "OFF" is set on screen S120, the second control unit 50 disables the definition of the dangerous action (nail down warning) and does not issue a playback instruction to the audio alert unit 2. Note that instead of displaying the ON / OFF setting area A4 on screen S120, a threshold area A5 for changing the sixth threshold [kg] may be displayed.

[0128] [Load Fall Warning] Screens S121 and S122 are screens for enabling or disabling the definition of a dangerous act (cargo fall warning). The definition of a dangerous act (cargo fall warning) includes the following criteria for determining a cargo fall warning: "there is no cargo handling operation, and the load (a load exceeding the load threshold) has decreased by a predetermined amount (e.g., ¼ of the load) or more, and this sudden load change continues for a predetermined time (e.g., 2 seconds)." If this definition (determination criteria) is met, the audio alert unit 2 plays warning audio data saying "The cargo has fallen" as an audio alert.

[0129] On screen S121, the item "Administrator Settings" is displayed in menu area A1, sub-items including "Falling Cargo Warning" are displayed in sub-menu area A2, and the cursor is positioned on "Falling Cargo Warning." On screen S122, the item "Falling Cargo Warning" is displayed in menu area A1, and "ON," "OFF," and the cursor are displayed in ON / OFF setting area A4.

[0130] When "ON" is set on the screen S122, the second control unit 50 enables the definition of the dangerous act (cargo fall warning) and issues a playback instruction to the audio alert unit 2 when the definition is met. On the other hand, when "OFF" is set on the screen S122, the second control unit 50 disables the definition of the dangerous act (cargo fall warning) and does not issue a playback instruction to the audio alert unit 2. Note that instead of displaying the ON / OFF setting area A4 on the screen S122, a threshold area A5 for changing the above-mentioned predetermined amount (e.g., 1 / 4 of the load) and / or predetermined time (e.g., 2 seconds) may be displayed.

[0131] [Loading point insufficient warning] Screens S123 and S124 are screens for enabling or disabling the definition of a dangerous act (insufficient cargo landing warning). The definition of a dangerous act (insufficient cargo landing warning) includes the following conditions for determining an insufficient cargo landing warning: "The load is reduced by a predetermined amount during a loading operation, and the load is reduced to less than a seventh threshold value [kg] while the vehicle body 10 is reversing within a preset second distance [m] from the point at which the load was reduced." The second distance is set to a value that determines whether the forks 23 have completely come off the pallet containing the cargo. The seventh threshold value is set separately from the load threshold value and is set to a value that can distinguish between a loaded state and an unloaded state. When the above definition (determination condition) is met, the audio alert unit 2 plays warning audio data stating, "The load has not been properly landed."

[0132] On screen S123, the item "Administrator Settings" is displayed in menu area A1, and sub-items including "Insufficient Landing Site Warning" are displayed in sub-menu area A2, with the cursor positioned on "Insufficient Landing Site Warning." On screen S124, the item "Insufficient Landing Site Warning" is displayed in menu area A1, and "ON," "OFF," and the cursor are displayed in ON / OFF setting area A4.

[0133] When "ON" is set on screen S124, the second control unit 50 enables the definition of the dangerous act (insufficient landing site warning) and issues a playback instruction to the audio alert unit 2 when the definition is met. On the other hand, when "OFF" is set on screen S124, the second control unit 50 disables the definition of the dangerous act (insufficient landing site warning) and does not issue a playback instruction to the audio alert unit 2. Note that instead of displaying the ON / OFF setting area A4 on screen S124, a threshold area A5 for changing at least one of the seventh threshold and the second distance may be displayed.

[0134] [Away Warning] Screens S125 and S126 are screens for enabling or disabling the definition of a dangerous act (seat leaving warning). The definition of a dangerous act (seat leaving warning) includes "the key switch is in the key-on state and the operator has left the driver's seat 13" as a judgment condition (seat leaving condition) for the seat leaving warning. When this definition (judgment condition) is met, the audio alert unit 2 plays warning audio data saying "Please sit correctly" as an audio alert.

[0135] On screen S125, the menu area A1 displays the item "Administrator Settings," and sub-menu area A2 displays sub-items including "Away Alert," with the cursor positioned on "Away Alert." On screen S126, the menu area A1 displays the item "Away Alert," and ON / OFF setting area A4 displays "ON," "OFF," and the cursor.

[0136] When "ON" is set on screen S126, the second control unit 50 enables the definition of the dangerous behavior (avoidance warning) and, when the definition is met, issues a playback instruction to the audio alert unit 2. On the other hand, when "OFF" is set on screen S126, the second control unit 50 disables the definition of the dangerous behavior (avoidance warning) and does not issue a playback instruction to the audio alert unit 2.

[0137] [Seatbelt warning] Screens S127 and S128 are screens for enabling or disabling the definition of a dangerous act (seat belt warning). The definition of a dangerous act (seat belt warning) includes "seat belt not fastened and driving or loading operation" as a judgment condition (first seat belt condition) for a seat belt warning. When this definition (judgment condition) is met, the audio alert unit 2 plays warning audio data saying "Please fasten your seat belt" as an audio alert.

[0138] On screen S127, the menu area A1 displays the item "Administrator Settings," and sub-menu area A2 displays sub-items including "Seat Belt Warning," with the cursor positioned on "Seat Belt Warning." On screen S128, the menu area A1 displays the item "Seat Belt Warning," and ON / OFF setting area A4 displays "ON," "OFF," and the cursor.

[0139] When "ON" is set on the screen S128, the second control unit 50 enables the definition of the dangerous act (seat belt warning) and, when the definition is satisfied, issues a playback instruction to the audio alert unit 2. On the other hand, when "OFF" is set on the screen S128, the second control unit 50 disables the definition of the dangerous act (seat belt warning) and does not issue a playback instruction to the audio alert unit 2.

[0140] Furthermore, the definition of a dangerous act (seat belt warning) may include "the seat belt is fastened and the operator has left the driver's seat 13" as a condition for determining whether the seat belt warning is issued (second seat belt condition). The sensor unit 30 detects whether the seat belt is fastened or not by, for example, whether the tongue plate of the seat belt is properly inserted into the buckle, and therefore there is a risk that the sensor unit 30 may determine that the seat belt is fastened even if the operator has left the driver's seat 13. In this regard, by setting the condition for determining a seat belt warning (second seat belt condition) and issuing an audio alert as described above, it is possible to prevent the dangerous act of so-called false seat belt fastening (false seat belt fastening).

[0141] [Audio Alert Volume] Screens S129 and S130 are screens for changing or disabling the definition of dangerous behavior (audio alert volume). Note that the audio alert volume does not directly correspond to dangerous behavior, but if the audio alert volume is low, there is a risk that other dangerous behaviors cannot be avoided.

[0142] On the screen S129, the item "Administrator Settings" is displayed in the menu area A1, sub-items including "Audio Alert Volume" are displayed in the sub-menu area A2, and the cursor is positioned on "Audio Alert Volume".

[0143] On screen S130, the menu area A1 displays the item "audio alert volume," and a volume setting area A7 is displayed in place of the submenu area A2 (screen S130 corresponds to the "volume setting screen" of the present invention). The volume setting area A7 displays a numerical value input field and a numerical value range (1 to 6 in this embodiment) that corresponds to the "first volume input field" of the present invention. A numerical value (level) for the audio alert volume is input into the numerical value input field. The numerical value (level) can be increased or decreased by operating switches B3 and B4. When "--" is input into the numerical value input field, the volume becomes zero, and the definition of dangerous behavior is invalidated. Note that "0" may be input instead of "--."

[0144] When the volume is changed by an input operation in the volume setting area A7, the third control unit 60 issues a change instruction to the second control unit 50. The second control unit 50, upon receiving the change instruction, changes the volume setting for normal times (when set to OFF) in the second data. When the volume is changed within the range of 1 to 6, the second control unit 50 refers to the second data to identify the volume and issues a playback instruction to the audio alert unit 2 when the definition of a risky act is met. On the other hand, when the volume is changed to zero ("--" in FIG. 10), the second control unit 50 does not issue a playback instruction to the audio alert unit 2.

[0145] In this embodiment, since the volume of the second data is the same for each risky act, the third control unit 60 displays a volume setting screen on the display 4 that changes the volume all at once, but if the volume of the second data differs for each risky act, the display 4 may also display a volume setting screen that changes the volume for each risky act.

[0146] [Cover left open warning] Screens S131 and S132 are screens for enabling or disabling the definition of a dangerous act (cover left open warning). The definition of a dangerous act (cover left open warning) includes a determination condition (first determination condition) = "charging plug 103 is connected to vehicle-side outlet BT4." When this definition (first determination condition) is met, audio alert unit 2 plays warning audio data saying "Please open the battery cover" as an audio alert.

[0147] If the determination conditions include a second determination condition ("a charging start operation has been performed"), the audio alert unit 2 issues the above audio alert when the second determination condition is satisfied. If the determination conditions include a first determination condition and a second determination condition ("the charging plug 103 has been connected to the vehicle-side outlet BT4, or a charging start operation has been performed"), the audio alert unit 2 issues the above audio alert when the first determination condition is satisfied, and also issues the above audio alert when the second determination condition is satisfied.

[0148] On screen S131, the "Administrator Settings" item is displayed in menu area A1, and sub-items including "Cover Forgotten to Open Warning" are displayed in sub-menu area A2, with the cursor positioned on "Cover Forgotten to Open Warning." On screen S132, the "Cover Forgotten to Open Warning" item is displayed in menu area A1, and "ON," "OFF," and the cursor are displayed in ON / OFF setting area A4.

[0149] When "ON" is set on screen S132, the second control unit 50 enables the definition of the dangerous act (cover left open warning) and issues a playback instruction to the audio alert unit 2 when the definition is met. On the other hand, when "OFF" is set on screen S132, the second control unit 50 disables the definition of the dangerous act (cover left open warning) and does not issue a playback instruction to the audio alert unit 2.

[0150] [Volume limit warning] Screens S133 to S136 are screens for limiting the volume. Note that the volume limit warning does not directly correspond to a dangerous act, but depending on the surrounding environment of the work area, a loud volume may cause a nuisance to neighbors. Therefore, in this embodiment, the volume limit warning is treated as a dangerous act.

[0151] On the screen S133, the item "Administrator Settings" is displayed in the menu area A1, sub-items including "Volume Limit Warning" are displayed in the sub-menu area A2, and the cursor is positioned on "Volume Limit Warning".

[0152] On screen S134, the menu area A1 displays the item "Volume Limit Warning," and the ON / OFF setting area A4 displays "ON," "OFF," and a cursor. When "ON" is set on screen S134, volume is limited, whereas when "OFF" is set on screen S134, volume is not limited. When switch B1 is operated with "ON" selected on screen S134 (when "ON" is set), the screen transitions to screen S135.

[0153] On screen S135, a "Volume Limit Warning" item is displayed in menu area A1, and a numeric input field and numeric range are displayed in volume setting area A7, similar to screen S130. However, the numeric input field on screen S135 corresponds to the "second volume input field" of the present invention.

[0154] On screen S136, a "Volume Limit Warning" item is displayed in menu area A1, and a time period setting field for inputting the time period during which the volume limit is to be applied is displayed in threshold area A5. The operator can set the start and end times of the volume limit by operating switches B3 and B4. If the settings are as shown on screen S136 in FIG. 11, the volume limit will start at 6:00 PM and end at 6:00 AM.

[0155] When the setting is OFF, or when the setting is ON, the volume is changed, and the time period is set, the third control unit 60 issues a change instruction to the second control unit 50. Upon receiving the change instruction, the second control unit 50 changes the information of the second data. Furthermore, when reproducing warning audio data during the time period set in the time period setting field, the second control unit 50 issues a reproduction instruction to the audio alert unit 2 so that the warning audio data is reproduced at the volume of the numerical value (level) set on the screen S135.

[0156] In addition, if the volume value (level) set on screen S130 is smaller than the value (level) set on screen S135, the second control unit 50 may issue a playback instruction to the audio alert unit 2 so that the warning audio data is played at the volume of the value (level) set on screen S130, even if it is during the time period set in the time period setting field.

[0157] The forklift 1 according to this embodiment can warn the operator to prevent forgetting to open the battery cover BT3 during charging. As a result, it is possible to prevent the accumulation of hydrogen gas generated during charging of the battery BT1, thereby reducing the risk of fire or explosion due to hydrogen gas.

[0158] Furthermore, in the forklift 1 according to this embodiment, the third control unit 60 causes the display 4 to display an ON / OFF setting screen for switching between ON and OFF settings for the determination condition of a dangerous act (a warning that the cover has been left open). When the ON / OFF setting screen is set to OFF, the second control unit 50 disables the definition of the dangerous act (a warning that the cover has been left open) and does not issue a playback instruction to the audio alert unit 2. Therefore, according to the forklift 1 according to this embodiment, when a warning that the cover has been left open is not necessary (for example, when the battery BT1 is a lithium-ion battery), it is possible to avoid unnecessary audio alerts.

[0159] Furthermore, according to the forklift 1 of this embodiment, the volume is limited by the volume limit warning, so that the audio alert can be prevented to some extent from being a nuisance to neighbors.

[0160] Although the embodiment of the cargo handling vehicle according to the present invention has been described above, the present invention is not limited to the above embodiment.

[0161] [Variations] In the forklift 1, the display 4 may include at least a part of the functions of the charging operation unit BT5.

[0162] In this modification, when the charging plug 103 is connected to the vehicle-side outlet BT4, as shown in FIG. 12, the third control unit 60 automatically displays a screen S137 on the display unit 4A. The screen S137 is a charging mode selection screen that allows the operator to select a charging mode. On the screen S137, a "Charging Mode" item is displayed in the menu area A1, and a charging mode selection area A8 is displayed instead of the submenu area A2. The charging mode selection area A8 displays "Automatic Charging," "Uniform Charging," "Scheduled Charging," and a cursor. The operator can select "Automatic Charging," "Uniform Charging," or "Scheduled Charging" by operating switches B3 and B4 to move the cursor.

[0163] In the charging mode selection area A8, "Automatic charging" corresponds to the automatic charging button BT51, "Equalized charging" corresponds to the equalized charging button BT53, and "Scheduled charging" corresponds to the scheduled charging button BT52. That is, the display 4 of this modified example is configured to accept an operation (operation to start charging) by the operator. Therefore, the second determination condition for a dangerous act (warning for forgetting to open the cover) is "An operation to start charging has been performed (for example, the charging operation unit BT5 or the display 4 has accepted the operation to start charging)."

[0164] In addition, in this modification, since the display 4 functions as the "charging operation unit," the automatic charging button BT51, the scheduled charging button BT52, and the equalized charging button BT53 of the charging operation unit BT5 do not have to be provided on the vehicle main body 10. If the display 4 further includes the function of the stop button BT54, the stop button BT54 of the charging operation unit BT5 does not have to be provided on the vehicle main body 10.

[0165] [Other variations] The loading vehicle of the present invention is a loading vehicle comprising: a vehicle body equipped with a loading device; an audio alert unit that stores warning audio data and plays the warning audio data to issue an audio alert; and a control unit that controls the vehicle body and the audio alert unit. The vehicle body comprises: a battery that is a power source for the vehicle body's traveling and loading operations; a battery storage unit with an opening that stores the battery; a battery cover that closes the opening when closed and opens the opening when open; a vehicle-side outlet to which a charging plug for charging the battery is connected; and a charging operation unit that accepts a charging start operation by an operator for charging. The control unit comprises a first control unit that controls the vehicle body; and a second control unit that stores data related to judgment conditions for playing the warning audio data and instructs the audio alert unit to play the warning audio data when the judgment conditions are met. The judgment conditions include at least one of a first judgment condition that a charging plug has been connected to the vehicle-side outlet and a second judgment condition that a charging start operation has been performed. The configuration of the warning audio data can be modified as appropriate as long as it includes information to prompt the operator to open the battery cover.

[0166] In the above embodiment, the combination of the menu area A1 with the ON / OFF setting area A4, threshold area A5, or condition setting area A6 can be changed as needed. Entering "--" in the value input field of the threshold area A5 results in no playback instruction, but the display when no value is entered (the above "--") can be changed as needed. The content of the audio alert (the content of the warning audio data) can also be changed as needed.

[0167] In the above embodiment, for example, screens S101 to S137 have been described as administrator setting screens, but at least some of screens S101 to S137 may be service setting screens that cannot be operated by operators but can be operated by service personnel (customer engineers). For example, the access level of the setting screen for changing and / or invalidating the definition of a dangerous act can be set for each dangerous act.

[0168] In the above embodiment, an audio alert for dangerous actions (warning for forgetting to open the cover) is issued regardless of the state of the battery cover BT3. However, if the forklift 1 is equipped with a sensor that detects the state (open / closed) of the battery cover BT3, the forklift 1 may be configured not to issue an audio alert for dangerous actions (warning for forgetting to open the cover) when the battery cover BT3 is in the open state.

[0169] In the above embodiment, the cargo handling vehicle of the present invention has been described using a counterbalance type forklift as an example, but it may also be a reach type forklift or another type of forklift. Furthermore, the cargo handling vehicle of the present invention is not limited to a forklift, and may be a vehicle other than a forklift (for example, a transport vehicle) as long as it is equipped with a cargo handling device that can be raised and lowered. [Explanation of symbols]

[0170] 1 forklift 2. Audio alert section 3 Warning section 4. Display 4A display section 4B Input section 10 Vehicle body 11 Front wheel 12 rear wheels 13 Driver's seat 14 Axel 15 Brake 16 Handle 17 Cargo handling operation section 18 Head Guard 20 Cargo handling equipment 21 Mast 22 Lift bracket 23 Fork 24 Backrest 25 Tilt cylinder 26 Lift cylinder 30 Sensor unit 31 Load sensor 32 Vehicle speed sensor 33 Rotation angle sensor 34 Accelerator sensor 35 Brake sensor 40 First Control Section 50 Second Control Section 60 Third Control Section 100 Charging device 101 Power plug 102 Cable 103 Charging plug

Claims

1. a vehicle body provided with a loading device; a voice alert unit that stores warning voice data and reproduces the warning voice data to give a voice alert; a control unit that controls the vehicle body and the audio alert unit; A cargo handling vehicle comprising: The vehicle body includes: a battery that is a power source for the running operation and loading / unloading operation of the vehicle body; a battery storage section having an opening and configured to store the battery; a battery cover that closes the opening when in a closed state and opens the opening when in an open state; a vehicle-side outlet to which a charging plug for charging the battery is connected; a charging operation unit that accepts a charging start operation by an operator to perform the charging, The control unit a first control unit that controls the vehicle body; a second control unit that stores data relating to a determination condition for reproducing the warning audio data, and instructs the audio alert unit to reproduce the warning audio data when the determination condition is satisfied, the determination conditions include at least one of a first determination condition that the charging plug is connected to the vehicle-side outlet and a second determination condition that the charging start operation is performed; The warning audio data includes information for prompting the operator to open the battery cover. A cargo handling vehicle characterized by:

2. a display including a display unit and an input unit; the control unit includes a third control unit that controls the display, the third control unit causes the display unit to display an ON / OFF setting screen for switching between an ON setting and an OFF setting of the determination condition; The second control unit issues the playback instruction when the setting is ON, but does not issue the playback instruction when the setting is OFF.

2. The cargo handling vehicle according to claim 1.

3. The third control unit causes the display unit to display a volume setting screen for changing the volume of the warning audio data when it is reproduced, in response to an input operation on the input unit, and causes the display unit to display a first volume input field for inputting a volume level on the volume setting screen.

3. The cargo handling vehicle according to claim 2.

4. the third control unit displays, on the volume setting screen, a time zone setting field for setting a time zone and a second volume input field for inputting the level of the volume; The second control unit issues the reproduction instruction so that the warning audio data is reproduced at a volume equal to or lower than the level input in the second volume input field during the time period set in the time period setting field.

4. The cargo handling vehicle according to claim 3.

5. The charging operation unit a charging button that starts the charging immediately after being operated; a scheduled charging button for starting the charging at a preset time, the determination condition includes the second determination condition, The second determination condition includes whether the charging button has been operated or whether the scheduled charging button has been operated.

3. The cargo handling vehicle according to claim 2.

6. the display includes the charging operation unit, The third control unit causes the display unit to display a charge mode selection screen that allows the operator to select a charge mode for the charge, and causes the charge button and the reserved charge button to be displayed on the charge mode selection screen.

6. A cargo handling vehicle according to claim 5.

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