JP2012087679A - Industrial vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an industrial vehicle which prevents a trouble occurring due to a loading and unloading means such as a fork ascending and descending a cargo, caused by stopping of an engine during idling.SOLUTION: In the industrial vehicle, a vehicle body includes an idling stop mode switch 41 permitting automatic suspension of an engine 56 during idling of the engine 56, a loading and unloading device includes a height detecting switch 35 detecting whether the height of a fork is a prescribed height or lower, and when it is detected that the engine speed of the engine 56 is an idling engine speed at least when automatic suspension of the engine 56 is permitted by the idling stop mode switch 41 and the height detecting switch 35 detects that the height of the fork is the prescribed height or lower, a count of time by a timer is started and when the count of time reaches a preset first set time, the engine 56 is automatically stopped.

Description

  The present invention relates to industrial vehicles, and more particularly to engine control.

There are forklifts and the like as industrial vehicles. This type of forklift is composed of a traveling vehicle body and a cargo handling device (fork device) provided on the vehicle body.
Of course, the vehicle body is provided with an engine, and as a fork device, a fork that supports a load and can be moved up and down and tilted back and forth. A lever and an operation lever for tilting are provided, and a cargo handling operation is performed by operating these operation levers.

  By the way, recently, energy saving has been said. For example, in a forklift, the engine is usually rotating even when not working, so-called idling state is uneconomical.

  From such a viewpoint, for example, when the engine is in an idling state, if the vehicle speed is approximately 0 km / h, the gear is in the neutral position, and the clutch pedal is not depressed, Has been proposed (for example, see Patent Document 1).

Japanese Patent Application Laid-Open No. 07-224695

  However, conventionally, in an industrial vehicle, a hydraulic pump that is directly connected to an engine and supplies pressure oil used to drive a cargo handling device is provided. For example, in a forklift, a hydraulic pump is installed in a lift cylinder that is used to lift and lower a fork. More pressure oil is supplied. When the engine stops, the hydraulic pump also stops and pressure oil is no longer supplied. In this way, when the engine is stopped and the supply of pressure oil is stopped, especially for beginners and newcomers, the fork may not be lifted and the fork may be left as it is raised. In addition, the rising fork and the load supported by the fork may interfere with the surrounding work, and may cause a problem that the worker contacts carelessly.

  Accordingly, the present invention provides an industrial vehicle including a cargo handling device that lifts and lowers a load, and can prevent problems caused by cargo handling means such as a fork due to an automatic engine stop during idling. It is aimed at.

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is a hydraulic cargo handling apparatus having a vehicle main body for traveling and a cargo handling means attached to the vehicle main body for lifting and lowering a load. The vehicle body, an engine, a hydraulic pump that is driven by the engine and supplies pressure oil to the cargo handling device, a battery, a starter motor that is powered by the battery and starts the engine, An industrial vehicle equipped with a rotational speed detection device for detecting the rotational speed of an engine,
The vehicle main body is provided with an idling stop mode switch that allows the engine to automatically stop while the engine is idling, and the cargo handling device has a height of the cargo handling means equal to or lower than a predetermined height. A height detecting device for detecting whether or not the engine is automatically stopped at least by the idling stop mode switch, and the height of the cargo handling means is set by the height detecting device. When it is detected that the engine speed is equal to or less than a predetermined height, when the engine speed is determined to be the idling engine speed by the engine speed detector, the timer starts counting the time, The engine is automatically stopped when a first set time set in advance is reached.

  According to the above-described configuration, at least the condition that the engine is allowed to pause automatically during idling by the idling stop mode switch and the height of the fork is equal to or lower than the predetermined height is satisfied. In this state, when the engine speed reaches the idling speed, the timer starts counting time, and when the time reaches the preset first set time, the engine is automatically stopped temporarily, thus saving energy. Realized. Also, when the engine stops, the hydraulic pump stops, and if pressure oil is no longer supplied to the cargo handling device, the cargo handling means may be left in a position higher than the predetermined height, but the height of the cargo handling means is the predetermined height. Since it is a condition for the automatic stop of the engine that it is equal to or less than this, the possibility that the cargo handling means and the load supported by the cargo handling means are left in a position higher than a predetermined height is avoided.

  The invention according to claim 2 is the invention according to claim 1, wherein the engine is automatically stopped, and the time count by the timer is longer than the first set time. When the set time is reached, the power supply from the battery is cut off.

According to the above configuration, when the engine automatically stops and the time counted by the timer reaches the second set time, the power supply from the battery is cut off, and the battery is prevented from running out.
The invention according to claim 3 is the invention according to claim 2, wherein the vehicle main body is provided with an engine stop warning lamp, and the time count by the timer is shorter than the first set time. When the set third set time is reached, the engine stop notice lamp blinks, and when the time count by the timer reaches the first set time, the engine stop notice lamp is continuously lit, and the time by the timer is increased. When the count reaches a preset fourth set time that is longer than the first set time and shorter than the second set time, the engine stop warning lamp flashes at an interval shorter than the flash when the third set time elapses. It is characterized by doing.

According to the above configuration, the next state is notified to the driver (operator) of the industrial vehicle by the display state of the engine stop warning lamp.
Blinking ... The engine is automatically stopped after a while.

Lit ... The engine is automatically stopped.
Blinks at short intervals… After a while, power supply from the battery is cut off.
Therefore, the driver (operator) can know in advance the state of the engine and the power supply from the battery.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the vehicle main body is provided with a brake pedal as a travel operation device, and the engine is being automatically stopped. When the operation of the brake pedal is confirmed, the starter motor is driven to restart the engine.

  According to the above configuration, when the brake pedal is operated while the engine is automatically stopped, the engine is restarted. That is, as one of a series of operations for running the vehicle body, when the brake pedal is depressed, the engine is restarted and running is possible.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, further comprising a voltage detection device that detects the voltage of the battery, and is detected by the voltage detection device. When the battery voltage is less than a specified value, the automatic stop of the engine is stopped.

  If the voltage of the battery is less than the specified value and the engine is automatically stopped, the starter motor that restarts the engine is also supplied with power from the battery, which may make it impossible to restart the engine.

  According to the above configuration, when the battery voltage is less than the specified value, the automatic stop of the engine is not executed, thereby avoiding the possibility that the engine cannot be restarted.

  In the industrial vehicle of the present invention, when the engine speed reaches the idling speed, the timer starts counting time, and when the time reaches the preset first set time, the engine is temporarily stopped. This makes it possible to realize energy saving. At this time, the condition that the height of the cargo handling means is equal to or less than a predetermined height is a condition for automatic engine stop, so that the hydraulic pump stops and pressure oil is supplied to the cargo handling device. By eliminating, there is an effect that it is possible to avoid the possibility that the cargo handling means is left in a position higher than a predetermined height.

It is a time chart at the time of the engine temporary stop of the industrial vehicle in embodiment of this invention. It is a system block diagram around the engine of the industrial vehicle. It is a flowchart at the time of the engine temporary stop of the industrial vehicle. It is a perspective view of the industrial vehicle.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 4 is a perspective view of the industrial vehicle in the embodiment of the present invention.
As shown in FIG. 4, the forklift 10, which is an example of an industrial vehicle, includes a vehicle body 11 and a fork device (an example of a hydraulic cargo handling device) 12 attached to the vehicle body 11.

  The vehicle body 11 includes a vehicle body 21, a pair of left and right front wheels (drive wheels) 22 provided at the front portion of the vehicle body 21, a pair of left and right rear wheels 23 provided at the rear portion of the vehicle body 21, and the vehicle body 21. A driver seat 24 provided above, a head guard 25 disposed above the driver seat 24, a counterweight 26 provided on the vehicle body 21 behind the driver seat 24, and the like. The vehicle body 11 is supported by the front wheels 22 and the rear wheels 23, and the vehicle main body 11 can run freely by driving the front wheels 22.

  The fork device 12 is attached to the front end portion of the vehicle body 21 via a connecting shaft 31 in the vehicle width direction so as to be tiltable in the front-rear direction, and the mast 32 retractable in the vertical direction, and tilts the mast 32 back and forth. A tilt cylinder (not shown), a lift cylinder 33 that expands and contracts the mast 32 in the vertical direction, a pair of left and right forks (an example of cargo handling means) that are guided by the mast 32 and that can freely move up and down, and a tilt cylinder and a lift cylinder 33 It is comprised from the cargo handling drive part (main pump etc. which are mentioned later) etc. which drive. Further, the fork device 12 is provided with a fork height detection switch 35 (FIG. 2; an example of the height detection device) that operates when the height of the fork 34 becomes a predetermined height or less. The predetermined height is such that the fork 34 is lifted and left as it is, and the rising fork 34 and the load supported by the fork 34 obstruct the surrounding work, or the operator is careless. It is set to a height that can avoid the possibility of the occurrence of a problem of touching.

  The driver's seat 24 of the vehicle main body 11 is provided with an operation panel 41 (FIG. 2) in front thereof. The operation panel 41 includes a key switch 42, an idling stop mode switch 43, and an engine stop shown in FIG. A notice lamp (LED) 44 and instruments (not shown) are provided. The key switch 42 has an off (OFF) position, an on (ON) position, and a start (ST) position. By operating the key, the common (C) is turned off (OFF) or turned on (ON). ) Position or start (ST) position, and when the key is operated to the start (ST) position, the mechanism automatically returns to the on (ON) position. The idling stop mode switch 43 is a manual switch for selecting whether or not to permit the engine 56 (described later) to temporarily stop the engine 56 during idling, and is “permitted” (switch-on) and “not permitted”. (Switch off). The operator (operator) of the forklift 10 selects “permitted” or “not permitted”. The lighting state of the engine stop warning lamp (LED) 44 will be described later.

  Further, as shown in FIG. 4, the driver's seat 24 is provided with a handle 46, a forward / reverse operation lever 47, and a parking brake 48 as traveling operation means, and an accelerator pedal (not shown) under the floor. A brake pedal (not shown) is provided, an accelerator pedal angle detector 49 (FIG. 2) for detecting the depression angle of the accelerator pedal, and a brake pedal switch 50 (FIG. 2) for detecting the depression of the brake pedal. ing.

Further, the driver's seat 24 is provided with a cargo handling operation lever 52 that is a control lever of the fork device (cargo handling device) 12 and an air conditioner 53 (FIG. 2).
Further, as shown in FIG. 2, an engine 56, a starter (starter motor) 57 of the engine 56, a transmission 58 and a main pump (hydraulic pump) 59 connected to the drive shaft of the engine 56 are provided inside the vehicle body 21. Is provided.

  A propeller shaft 60 is connected to the output shaft of the transmission 58. When the output shaft of the transmission 58 is connected to the drive shaft of the engine 56 by a clutch (not shown) provided in the transmission 58, the propeller is connected. The power of the engine 56 is transmitted to the axles of the pair of left and right front wheels 22 by the shaft 60, the front wheels 22 are rotated, and the vehicle body 11 travels. When the main pump 59 is driven by the engine 56, it becomes possible to supply pressure oil from the main pump 59 to the lift cylinder 33 and the tilt cylinder, and the cargo handling operation (elevating the fork 34 and the mast 32) can be performed by operating the cargo handling lever 52. Tilting) is performed and control oil is supplied to the steering 61 of the handle 46 to facilitate the operation of the handle 46.

  Further, inside the vehicle body 21, a battery 63, an engine control device 64 for the engine 56, a starter relay 65, a battery relay 66, and a control device 67 including a computer are provided.

  As shown in FIG. 2, the battery 63 can supply power to the starter 57 via the battery relay 66 and the starter relay 65, and can supply power to the air conditioner 53 via the key switch 42.

  When the key switch 42 is key-operated to the on (ON) position or the start (ST) position, the battery relay 66 is turned on, and when the key switch 42 is key-operated to the off (OFF) position, The contact is turned off.

  The relay contact of the battery relay 66 is turned off when a power shut-off signal (described later) is output from the control device 67 even when the key switch 42 is in the on (ON) position. At this time, when the key switch 42 is key-operated to the start (ST) position, the relay contact of the battery relay 66 is turned on.

  When the relay contact of the battery relay 66 is turned on, power can be supplied from the battery 63 to the starter 57 via the starter relay 65. When the relay contact is turned off, power supply from the battery 63 to the starter 57 is interrupted. .

  The air conditioner 53 can be supplied with power from the battery 63 when the key switch 42 is operated to the on (ON) position, and from the battery 63 when the key switch 42 is operated to the off (OFF) position. Is interrupted.

  The starter relay 65 is turned on while the key switch 42 is operated to the start (ST) position or while an engine restart signal (described later) is output from the control device 67. Is turned on, power is supplied from the battery 63 to the starter 57, and the starter 57 is driven. That is, the engine 56 is started. Further, when the key switch 42 is operated to return from the start (ST) position to the on (ON) position, the relay contact of the starter relay 65 is turned off, and the power supply from the battery 63 to the starter 57 is cut off.

  Further, the air conditioner 53 turns on an operation switch (not shown) of the air conditioner 53 when the key switch 42 is in the ON position, that is, when power can be supplied from the battery 63. And the key switch 42 is set to the OFF position, that is, the power supply from the battery 63 is cut off, or the operation switch (not shown) of the air conditioner 53 is turned OFF. Is stopped by. Further, when the air conditioner 53 is being driven, an air conditioner use signal is output from the air conditioner 53 to the control device 67.

  The engine control device 64 is constituted by an electronic governor, and the operation position (off position or on position or start position) of the key switch 42, the relay contact of the battery relay 66 is turned on or off, and the engine output from the control device 67. Based on the start command signal and the engine stop command signal (described later), the engine 56 is started and stopped, and the rotation speed commanded by the rotation command signal (described later) output from the control device 67 is set. Accordingly, the fuel supplied to the engine 56 is adjusted to control the rotational speed of the engine 56. The engine control device 64 has a function of feeding back the actual rotational speed of the engine 56 to the control device 67, and also serves as a rotational speed detection device.

  Hereinafter, operations of “engine start” and “engine stop” based on the above configuration will be described, and further, engine speed control (sequence) by the control device 67, that is, “engine speed command” and “engine temporary stop” will be described. This will be described in detail.

As shown in FIG. 2, the control device 67 receives a signal (input signal) necessary for engine speed control and outputs a signal (output signal).
* Input signal • Operation signal for the idling stop mode switch 43 (switch ON signal).

-Neutral position signal of the forward / reverse operation lever 47.
-Brake on signal of parking brake 48.
The depression angle of the accelerator pedal detected by the accelerator pedal angle detector 49, that is, the engine speed command value.

-Brake pedal switch 50 on signal, that is, brake pedal depression signal.
An on signal of the fork height detection switch 35, that is, a signal that is turned on when the height of the fork 34 is not more than a predetermined height.

-Use signal of air conditioner 53.
A voltage signal of the battery 63.
The actual rotational speed of the engine 56 output from the engine control device 64.
* Output signal-Display signal to the engine stop warning lamp (LED) 44 (light-off signal, flashing signal, continuous lighting signal, flashing signal flashing at shorter intervals than the flashing signal).

A power cutoff signal to the battery relay 66.
An engine restart signal to the starter relay 65.
An engine start command signal, an engine stop command signal, and a rotation speed command signal to the engine control device 64.

"engine start"
When the key switch 42 is keyed to the on (ON) position, the relay contact of the battery relay 66 is turned on, the engine control device 64 is started, and then the key switch 42 is keyed to the start (ST) position. Then, the relay contact of the starter relay 65 is turned on, power is supplied from the battery 63 to the starter 57 via the relay contact of the battery relay 66 and the relay contact of the starter relay 65, and the starter 57 is driven to start the engine 56. . When the engine control device 64 is activated, the engine speed is controlled to the idling speed.

"Engine stop"
When the key switch 42 is keyed to the OFF (OFF) position, the engine control device 64 stops inputting the ON (ON) position (signal), so the engine 56 is stopped, and then the engine control device 64 Stop control. Further, the relay contact of the battery relay 66 is turned off, and the power supply from the battery 63 is cut off.

"Engine speed command"
When the accelerator pedal depression angle input from the accelerator pedal angle detector 49 is 0%, the control device 67 determines that the engine rotation speed command value is the idling rotation speed, and when the accelerator pedal depression angle is 100%, the engine rotation speed command value is An engine speed command value is obtained in proportion to the depression angle so as to reach the maximum speed, and is output to the engine control device 64 as a speed command signal.

Thereby, the engine control device 64 controls the engine speed of the engine 56 to the engine speed command value from the control device 67.
"Engine pause"
The control device 67 temporarily stops the engine 56 when the idling time becomes longer in order to save energy. This engine pause control will be described with reference to the flowchart of FIG.

First, it is confirmed whether or not the actual rotational speed of the engine 56 output from the engine control device 64 is the idling rotational speed (step-1). When it is confirmed that the engine 56 is idling, the engine 56 is temporarily stopped. It is confirmed whether or not all the idling stop conditions are satisfied (step-2 to step-7). That is,
Whether the idling stop mode switch 43 is on (whether a switch on signal is input),
-Whether the forward / reverse operation lever 47 is neutral (whether a neutral position signal is input),
-Whether the parking brake 48 is on (whether the brake on signal is input),
Whether the height of the fork 34 is equal to or less than a predetermined height (whether the fork height detection switch 35 is turned on, which is a signal equal to or lower than the predetermined height),
Whether the voltage of the battery 63 is equal to or higher than a specified voltage set to a voltage capable of driving the starter 57;
-Whether the air conditioner 53 is not in use (whether the use signal is off),
If any one of the conditions is not satisfied, or if the engine 56 is not idling in Step-1, the timer described later is reset (Step-8), and the process returns to Step-1. If established, the timer starts counting (step-9).

  Note that when the engine 56 is idling, at least the condition that “the idling stop mode switch 43 is ON” and “the height of the fork 34 is equal to or less than a predetermined height” is satisfied. This is an absolute condition for starting (a temporary stop of the engine 56 to be described later), and counting of the timer may be started when only the absolute condition is satisfied. Other conditions, that is, “whether the forward / reverse operation lever 47 is neutral”, “whether the parking brake 48 is on”, “whether the voltage of the battery 63 is equal to or higher than a specified voltage”, “a state where the air conditioner 53 is not used The condition “whether or not” is added according to the work environment. In the present embodiment, the above other conditions are all AND conditions. The cargo handling operation lever 52 (control lever of the cargo handling device) is not a condition for idling stop, and is not related to the temporary operation stop of the engine 56 during idling.

As the set time of the timer, a first set time T1, a second set time T2, a third set time T3, and a fourth set time T4 are set in advance.
First set time T1; time until the engine 56 is temporarily stopped.

Second set time T2: Time until the power supply from the battery 63 is cut off. (T1 <T2)
Third set time T3; a time that is shorter than the first set time T1 and starts the advance notice of the temporary stop of the engine 56. (T3 <T1)
Fourth set time T4; a time period longer than the first set time T1 and shorter than the second set time T2, and after the engine 56 is temporarily stopped, a notice of power shutoff is started. (T1 <T4 <T2)
These set times T1 to T4 can be arbitrarily set. However, the condition of T3 <T1 <T4 <T2 is necessary.

  Next, it is confirmed whether or not the third set time T3 has elapsed since the start of the timer count in Step-9 (Step-10). If confirmed, a blinking signal is sent to the engine stop warning lamp (LED) 44. Output (step-11).

In response to this flashing signal, the engine stop warning lamp (LED) 44 flashes and the engine 56 is temporarily stopped.
If the third set time T3 has not elapsed in Step-10, the process returns to Step-1.

  Subsequently, it is confirmed whether or not the first set time T1 has elapsed since the timer started counting (step -12). If confirmed, an engine stop command signal is output to the engine control device 64 and the engine is stopped. A continuous lighting signal is output to the warning lamp (LED) 44 (step -13).

  In response to the engine stop command signal, the engine control device 64 stops (temporarily stops) the engine 56, and in response to the continuous lighting signal, the engine stop warning lamp (LED) 44 lights continuously, and the engine 56 temporarily stops. It is informed that it is stopped.

  Next, it is confirmed whether or not an on signal of the brake pedal switch 50, that is, a brake pedal depression signal is input in a state where the engine 56 is temporarily stopped (step -14). The idling engine speed command value is output as the start command signal and the engine speed command signal, the engine restart signal is output to the starter relay 65, and the turn-off signal is output to the engine stop warning lamp (LED) 44 (step- 15) Return to the start. The engine restart signal to the starter relay 65 is turned off when the rotational speed of the engine 56 fed back from the engine control device 64 reaches a predetermined rotational speed (for example, 100 rpm) after startup.

  In response to the engine restart signal, power is supplied from the battery 63 to the starter 57 via the starter relay 65 to drive the starter 57, and the engine control device 64 is driven to restart the engine 56. The restarted engine 56 is controlled to the idling speed by the engine control device 64. In response to the turn-off signal, the engine stop warning lamp (LED) 44 is turned off.

  In step-14, when the brake pedal depression signal cannot be confirmed, it is subsequently confirmed whether or not the fourth set time T4 has elapsed since the timer was started (step-16). A flashing signal at short intervals is output to the warning lamp (LED) 44 (step-17). If it cannot be confirmed, return to Step-14 and check the brake pedal depression signal.

In response to the sudden flashing signal, the engine stop warning lamp (LED) 44 flashes at a shorter interval than when the engine stop warning is given, and the power shutdown is predicted.
When a quick flashing signal is output to the engine stop warning lamp (LED) 44, it is subsequently checked whether the second set time T2 has elapsed since the timer started counting (step -18). A power shut-off signal is output to the relay 66, and an extinguishing signal is output to the engine stop warning lamp (LED) 44 (step-19), and the process is terminated. If it cannot be confirmed, return to Step-14 and check the brake pedal depression signal.

  The battery relay 66 is turned off by the power cut-off signal, and the power supply from the battery 63 is cut off. Further, the engine stop warning lamp (LED) 44 is turned off in response to the turn-off signal.

A time chart based on the engine temporary stop control is shown in FIG.
As shown in FIG. 1, when the engine 56 reaches the idling speed and the idling stop condition for temporarily stopping the engine 56 is OK (when all are satisfied), the timer starts counting. At this time, the engine stop warning lamp (LED) 44 is turned off, and the battery relay 66 is turned on.

When the third set time T3 elapses after the timer starts counting, the engine stop notice lamp (LED) 44 blinks and the notice of temporary stop of the engine 56 is started.
Subsequently, when the first set time T1 elapses after the timer starts counting, the engine 56 is temporarily stopped and the engine stop warning lamp (LED) 44 is continuously lit to notify the engine 56 to be temporarily stopped.

Subsequently, when the fourth set time T4 elapses after the timer starts counting, the engine stop warning lamp (LED) 44 flashes rapidly to notify the power shutdown.
Subsequently, when the second set time T2 elapses after the timer starts counting, the power supply from the battery 63 is cut off (power is cut off), and the engine stop warning lamp (LED) 44 is turned off.

  As described above, when the engine 56 is at idling speed and the idling stop condition is OK, after the first set time T1 has elapsed, the engine 56 is temporarily stopped, and when the brake pedal is not depressed, after the second set time T2 has elapsed. The power supply from the battery 63 is cut off. When the engine 56 reaches the idling speed and the idling stop condition is OK, the engine stop warning lamp (LED) 44 notifies the engine 56 to be temporarily stopped and the brake pedal is depressed after the third set time T3 has elapsed. Otherwise, after the fourth set time T4 has elapsed, the power shutdown is notified.

Note that, after the power supply from the battery 63 is cut off, the engine 56 is started as usual when the key switch 42 is operated to the start position.
As described above, according to the present embodiment, at least the idling stop mode switch 43 is allowed to automatically stop the engine 56 during idling, and the height of the fork 34 is not more than a predetermined height. When the engine speed reaches the idling speed while the condition is satisfied, the timer starts counting the time, and the time count is set to the preset first set time T1. Then, the engine 56 is temporarily stopped automatically, and energy saving can be realized. Further, when the engine 56 is stopped, the main pump 59 is stopped, the pressure oil is not supplied to the fork device 12, and the fork 34 may be left in a position higher than a predetermined height. However, the fork 34 and the load supported by the fork 34 are prevented from being left in a position higher than the predetermined height, and the fork 34 that is being lifted is avoided. In addition, it is possible to avoid the possibility that the load supported by the fork 34 interferes with the surrounding work or that the operator may inadvertently come into contact.

  Further, according to the present embodiment, when the engine 56 automatically stops and the time count by the timer reaches the second set time T2, the power supply from the battery 63 is cut off, thereby preventing the battery 63 from running out of battery. can do.

  Further, according to the present embodiment, the driver (operator) of the forklift 10 can be informed of the state of the engine and the power supply from the battery 63 according to the display state of the engine stop warning lamp 44. .

  Further, according to the present embodiment, when the brake pedal is depressed as one of a series of operations when the vehicle main body 11 travels during the temporary automatic stop of the engine 56, the engine 56 is restarted and naturally It can be made to run.

  Further, according to the present embodiment, when the voltage of the battery 63 is not equal to or higher than the specified voltage, that is, less than the specified value, the starter 57 that restarts the engine 56 is also removed from the battery 63 when the engine 56 automatically stops. There is a possibility that the engine cannot be restarted because the power is supplied. However, when the voltage of the battery 63 is less than the specified value, the engine 56 is not temporarily stopped, so that the engine 56 cannot be restarted. Can be avoided.

  In the present embodiment, an example of an industrial vehicle is the forklift 10, but the forklift 10 is not limited to the forklift 10, and an industrial vehicle having a hydraulic cargo handling device that lifts and lowers the load, such as a wheel loader, etc. It may be. The cargo handling means is not limited to the fork 34, and may be a scoop or a hook. Further, the fork height detection switch 35 is used as a height detection device for detecting whether the height of the cargo handling means is equal to or lower than a predetermined height. It goes without saying that the height is detected.

  In the present embodiment, the idling stop mode switch 43 is a manual switch, but is configured to automatically switch between “permitted” and “not permitted” by using a wireless device, for example, according to an external command. It is also possible. According to this, it is possible to freely switch from the outside depending on the quality and quantity of the scheduled work and the work time zone.

DESCRIPTION OF SYMBOLS 10 Forklift 11 Vehicle body 12 Fork device 21 Car body 34 Fork 35 Fork height detection switch 42 Key switch 43 Idling stop mode switch 44 Engine stop warning lamp (LED)
47 Forward / reverse operation lever 48 Parking brake 49 Accelerator pedal angle detector 50 Brake pedal switch 53 Air conditioner 56 Engine 57 Starter 59 Main pump (hydraulic pump)
63 Battery 64 Engine control device 65 Starter relay 66 Battery relay 67 Control device

Claims (5)

A vehicle main body for traveling, and a hydraulic cargo handling device attached to the vehicle main body and having a cargo handling means for raising and lowering a load,
An engine, a hydraulic pump that is driven by the engine and supplies pressure oil to the cargo handling device, a battery, a starter motor that is supplied with power from the battery and starts the engine, and a rotational speed of the engine An industrial vehicle equipped with a rotational speed detection device for detecting,
The vehicle body includes an idling stop mode switch that allows the engine to automatically pause while the engine is idling.
The cargo handling device includes a height detection device that detects whether the height of the cargo handling means is equal to or lower than a predetermined height,
At least the idling stop mode switch is allowed to automatically pause the engine, and the height detection device detects that the height of the cargo handling means is below a predetermined height. When
When it is determined that the engine rotation speed detected by the rotation speed detection device is the idling rotation speed, the timer starts counting time, and when the time count reaches a preset first set time, An industrial vehicle characterized by automatically stopping the engine. 2. The power supply from the battery is cut off when the engine is automatically stopped and a time count by the timer reaches a preset second set time longer than the first set time. Industrial vehicle as described in. The vehicle body is provided with an engine stop warning lamp,
When the time count by the timer reaches a third preset time that is shorter than the first preset time, the engine stop warning lamp blinks,
When the time count by the timer reaches the first set time, the engine stop warning lamp is continuously lit,
When the time count by the timer reaches a preset fourth set time that is longer than the first set time and shorter than the second set time, the engine stop warning lamp blinks when the third set time elapses. The industrial vehicle according to claim 2, wherein the vehicle blinks at shorter intervals. The vehicle body includes a brake pedal as a travel operation device,
The industry according to any one of claims 1 to 3, wherein when the operation of the brake pedal is confirmed during the automatic stop of the engine, the starter motor is driven to restart the engine. For vehicles. A voltage detection device for detecting the voltage of the battery;
The industrial vehicle according to any one of claims 1 to 4, wherein when the battery voltage detected by the voltage detection device is less than a specified value, the automatic stop of the engine is stopped.

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