JP2021188332A - Construction machine vehicle - Google Patents

Abstract

To prevent an unexpected vehicle behavior from occurring on a construction machine vehicle on which a drive operation position of the vehicle and a work operation position during work are different.SOLUTION: A driver seat peripheral part on which a plurality of driving operating elements to drive the vehicle is disposed and a work operation part on which a plurality of work operating elements for conducting the work using the construction machine is disposed are independently disposed on a construction machine vehicle so that the construction machine can be driven by an engine as a power source. The construction machine vehicle has a movement stop state determination part S30 to determine whether or not the vehicle is in a stop state, an engine state determination part S40 to determine operational state of the engine, and a brake assist part S50 to set a parking brake device to an activated state when the brake assist part determines that a state in which the movement stop state determination part S30 determines as stop state and the engine state determination part S40 determines that engine operational state does not change continues for a first standby time, and the parking brake device to apply braking on wheels is not activated.SELECTED DRAWING: Figure 2

Description

The present invention relates to a technique relating to a construction machine vehicle (vehicle-based construction machine).

As a construction machine vehicle, for example, a road surface cutting vehicle equipped with a cutting object transfer device (belt conveyor, etc.) that cuts the road surface with a road surface cutting machine (construction machine) while traveling and conveys the cut object in the front-rear direction of the vehicle body. It can be exemplified.
The road surface cutting vehicle has, for example, the structure described in Patent Document 1. That is, this road surface cutting vehicle is capable of self-propelling with front and rear wheels for traveling, and is capable of cutting the road surface with a road surface cutting machine (cutter portion) provided so as to be able to move up and down with respect to the vehicle body. Then, while the road surface cutting vehicle is self-propelled, the asphalt pavement road surface is scraped (hazuru) by the road surface cutting machine, and the scraped cutting waste material is continuously transported to the front of the vehicle body by the transport conveyor.

In such a construction machine vehicle, for example, a driver's seat is provided on the upper part of the vehicle body, and a plurality of driving operators for traveling the vehicle are arranged around the driver's seat, and a worker operates the driving operator. Drive on public roads.
Further, in such a construction machine vehicle, a plurality of work operators for performing work using the construction machine are arranged at a position away from the driver's seat peripheral portion. When the construction work is performed, the worker operates the work operator of the work operation unit to operate the construction machine while appropriately moving the vehicle for the construction work.

Japanese Unexamined Patent Publication No. 11-50415

In the work of the road surface cutting machine, the waste material of the cut asphalt road surface is continuously discharged to the dump truck arranged in front of the vehicle. Then, when the loading amount of one dump truck reaches a specified amount, replacement work with another dump truck occurs.
During this replacement work, the road surface cutting machine is temporarily put into a standby state.
At this time, if the replacement time of the dump truck is short, the worker of the road surface cutting machine is also waiting near the vehicle in preparation for the next work.

However, due to the limited number of dump trucks arranged, if the waste material processing plant is far away, the waiting time may be long. When the waiting time becomes long, the worker may engage in work other than the work by the road surface cutting machine in consideration of work efficiency and the like.
In addition, in the cutting work of the asphalt road surface, the overlay method of laying new asphalt after the cutting work is the mainstream. Therefore, at the construction site, there are many workers engaged in various works under the site supervisor.

In the work flow at the site, workers engaged in cutting work also receive instructions from the site supervisor at any time, but in some cases, there are situations where they leave the vehicle for meetings.
When another work or meeting occurs in this way, normally, the vehicle is left in a braking state and then the vehicle is left, but depending on the carelessness of the worker, the safety confirmation process is performed. It is also assumed that they will leave the vehicle without being able to do so.

The present invention has been made focusing on the above points, and an object of the present invention is to prevent unexpected vehicle behavior from occurring in a construction machine vehicle in which the driving operation position of the vehicle and the working operation position during work are different. ..

In order to solve the problem, one aspect of the present invention is a construction machine vehicle, which is a vehicle equipped with a construction machine, and has a driver's seat peripheral portion in which a plurality of driver controls for vehicle traveling are arranged, and the driver's seat peripheral portion. The construction machine is provided with a work operation unit, which is arranged at a location away from the unit and in which a plurality of work operators for performing work using the construction machine are arranged, and the engine for vehicle running is used as a power source for the construction machine. A construction machine vehicle that can be driven, a movement stop state determination unit that determines whether or not the vehicle is in a stopped state, an engine state determination unit that determines the operating state of the engine, and the like. It is said that the state in which the movement stop state determination unit determines that the vehicle is in a stopped state and that the operating state of the engine has not changed based on the determination of the engine state determination unit continues for the preset first standby time. If it is determined that the parking brake device that applies braking to the wheels is not operating, the gist is to include a braking assist unit that activates the parking braking device.

According to one aspect of the present invention, it is possible to automatically prevent the occurrence of unexpected vehicle behavior in a construction machine vehicle in which the driving operation position of the vehicle and the working operation position at the time of work are different.

It is a side view which shows the vehicle composition which concerns on embodiment based on this invention. It is a conceptual diagram which shows the control system / braking system which concerns on embodiment based on this invention. It is a figure explaining the structure of the safety assist device.

Next, an embodiment of the present invention will be described with reference to the drawings.
In the present embodiment, as a construction machine vehicle, a road surface cutting vehicle equipped with a road surface cutting device (construction machine) will be described as an example.
In the present invention, the driving operation position when traveling on a public road (also referred to as when forwarding on a public road) is different from the working operation position for work using a construction machine at a work site, and the construction machine mounted on a vehicle has a different operation operation position. It is applicable if the power source is a construction machine vehicle that is an engine for traveling a vehicle.

(composition)
As shown in FIG. 1, the road surface cutting vehicle 1 of the present embodiment includes a vehicle body 2, traveling wheels 6, and a road surface cutting device (construction machine). Further, the driver's seat 9 is provided on the upper part of the vehicle body.
A plurality of driving operators for traveling the vehicle are provided in the vicinity of the driver's seat around the driver's seat 9. Further, on the side of the vehicle body 2, an instruction panel 21 and other work operation units are provided, in which a plurality of work operators for performing work using the construction machine are arranged.

<Road cutting equipment (construction machinery)>
In the present embodiment, as a road surface cutting device (construction machine), a road surface cutting machine 3 that is supported so as to be able to move up and down with respect to the vehicle body 2, an actuator 4 that raises and lowers the road surface cutting machine 3, and a conveyor that extends in the front-rear direction of the vehicle body. 5 and.
The conveyor 5 is a conveyor that conveys the cutting waste material scraped by the road surface cutting machine 3 to the front in the front-rear direction of the vehicle body 2, and is supported by the vehicle body 2. Then, in the cutting work state of cutting the road surface, as shown in FIG. 1, the conveyor 5 is set in a state of being extended forward in the front-rear direction of the vehicle body, and the cutting waste material due to the cutting can be conveyed to the truck bed or the like.

The road surface cutting machine 3 is arranged at the lower part of the vehicle body 2 between the front wheels 6A and the rear wheels 6B. The road surface cutting machine 3 is configured by providing a large number of cutter bits on the peripheral surface of a cutter drum whose axis is directed in the width direction of the vehicle body. The cutter drum is rotatably supported by the machine frame 7, and is configured to be rotatable by a hydraulic motor (not shown). The machine frame 7 is, for example, a box-shaped frame with an open bottom.
The actuator 4 that raises and lowers the road surface cutting machine 3 is composed of a pair of left and right hydraulic cylinders for raising and lowering. Each elevating hydraulic cylinder is attached to the vehicle body 2 with the cylinder body oriented vertically, and the cylinder rod extends downward from the cylinder body. The tip of the cylinder rod is connected to the machine frame 7. As a result, the vertical position (position with respect to the road surface) of the machine frame 7, that is, the road surface cutting machine 3 with respect to the vehicle body 2 is adjusted according to the stroke amount of the lifting hydraulic cylinder, and the cutting depth by the road surface cutting machine 3 is adjusted. To. The road surface cutting machine 3 is position-adjusted to either an upper standby position or a lower position in the cutting work state.

Further, a third hydraulic cylinder (not shown) that is slanted in the vehicle width direction and connects the lower part of the vehicle body and the machine frame 7 is provided, and by driving the third hydraulic cylinder, the machine frame 7, that is, the road surface is provided. The position of the cutting machine 3 in the vehicle width direction can be shifted to the left or right. Each cylinder body of the lifting hydraulic cylinder is supported by the vehicle body in a state where it can swing at least in the vehicle width direction.
Here, the front side of the machine frame 7 is connected to the vehicle body 2 via a parallel link 8 extending in the front-rear direction of the vehicle body 2. A pair of parallel links 8 are arranged on both sides in the vehicle width direction. By providing the parallel link 8, the machine frame 7 is maintained in a constant posture as it moves up and down.

<Vehicle drive / braking system>
The road surface cutting device 30 such as the road surface cutting machine 3 uses the power from the engine 32 as a drive source, and the construction machine control unit 31 including the hydraulic circuit controls the elevating and rotational drive of the road surface cutting machine 3 ( See Figure 2).
The construction machine control unit 31 can be executed by an instruction by an operator such as a button provided on the instruction panel 21 for work. The instruction panel 21 is provided in the work operation unit 40, and the instruction panel 21 is provided with a part of the work operator.

As shown in FIG. 2, the traveling wheel 6 of the present embodiment is composed of a front wheel 6A provided on the front side of the vehicle body 2 and a rear wheel 6B provided on the rear side of the vehicle body 2. The front wheel 6A can be steered by operating the steering wheel. The axle of the rear wheel 6B is connected to the engine 32 via the transmission 34, and constitutes a drive wheel that is rotationally driven by the driving force from the engine 32. Further, the power of the engine 32 is used as a hydraulic drive source for driving the road surface cutting device 30 (construction machine).

Further, the drive wheel 6B is provided with a parking brake device 36 for applying a braking force to the drive wheel 6B and a service brake device 37.
Further, as various control units, as shown in FIG. 2, the engine control unit 33 that controls the drive of the engine 32, the transmission control unit 35 that controls the transmission 34, and the parking brake braking that controls the parking brake device 36. It includes a control unit 38 and a service brake braking control unit 39 that controls the service brake device 37.
Further, it is provided with a plurality of driving operators and a plurality of work operators for instructing the operation of the vehicle.

<Driving controller>
A plurality of driving operators are arranged in the driver's seat peripheral portion 50. The plurality of driving controls are controls for driving the vehicle, and can be operated by a worker seated in the driver's seat 9.
In the present embodiment, as shown in FIG. 2, as a plurality of operation operators, an engine switch 44, a forward / backward advance lever 45, an accelerator pedal 46, a steering wheel 47, a brake lever 48, a foot brake 49, and a work main switch 51 are provided. ..

The engine switch 44 is an operator that supplies an instruction to start / stop the engine 32 to the engine control unit 33.
The forward / backward lever 45 on the driver side is an operator that indicates the vehicle traveling direction, has a forward position, a neutral position, and a reverse position, and supplies the set traveling direction information to the transmission control unit 35. Is. Further, the instruction information of the forward / backward lever 45 on the operation side is supplied to the work main switch 51.

The accelerator pedal 46 is an operator for instructing the vehicle speed, and supplies the vehicle speed instruction to the engine control unit 33.
The steering wheel is an operator that indicates the steering direction.
The brake lever 48 is a parking brake operator, and the parking brake instruction is supplied to the parking brake braking control unit 38.
The foot brake 49 is a service brake operator, and the service brake instruction is supplied to the service brake braking control unit 39.

The work main switch 51 is a switch for switching between a work mode and a forwarding mode (mode for traveling on public roads).
By turning on the work main switch 51, the instruction of the work operator becomes effective.
The work main switch 51 can supply the instruction information to the construction machine control unit 31. The work main switch 51 of the present embodiment can be switched to the work mode only when the forward / backward lever 45 on the operation side is in the neutral position.
The instruction information of the work main switch 51 is also supplied to the safety assist device described later.

<Work operator>
The plurality of work operators are operators for instructing work operations using construction machines, and are arranged in the work operation unit 40 away from the driver's seat peripheral portion 50. The position of the work operation unit 40 of the present embodiment is a position that can be operated by a worker located on the road surface obtained from the vehicle.
In the present embodiment, as instructions for work operation using the construction machine, there are instructions to the construction machine (road surface cutting device 30) itself and instructions regarding vehicle movement accompanying the work.

In the present embodiment, as a work operator, as shown in FIG. 2, a forward / backward lever 41 for work, a parking brake switch 42, various controls 43 for construction machinery, and a rotation speed switch 52 are provided.
The forward / backward lever 41 for work is an operator that indicates the vehicle traveling direction, has a forward position, a neutral position, and a reverse position, and supplies the set traveling direction information to the transmission control unit 35. Is.

The parking brake switch 42 is a parking brake operator, and the parking brake instruction is supplied to the parking brake braking control unit 38.
The rotation speed switch 52 is an operator that instructs the engine control unit 33 to indicate the rotation speed of the engine 32. As the rotation speed instruction by the rotation speed switch 52 of the present embodiment, the high rotation speed mode which is the rotation speed for driving the construction machine for driving the construction machine and the construction machine are driven in a state where the load is not applied to the construction machine. It has a possible low speed mode.

Here, in the present embodiment, the engine rotation speed in the high rotation speed mode and in the state where the construction machine is not loaded corresponds to the high idle state described later. Further, the engine speed in the low speed mode is the low idle state described later. The rotation speed in the low idle state may be higher or lower than the engine rotation speed in the low rotation speed mode.
The various operators 43 for the construction machine are operators that instruct various operations of the road surface cutting device 30, and the instruction information is supplied to the construction machine control unit 31. The various controls 43 for construction machinery, for example, instruct the ascending / descending and rotational driving of the road surface cutting machine 3.

<Control unit>
The engine control unit 33 is driven by turning on the engine switch 44. The engine control unit 33 executes drive control of the engine 32 based on an instruction of the accelerator pedal 46 or the like.
The transmission control unit 35 controls the state of the transmission 34 based on the instructions of the forward / backward lever 45 for operation and the forward / backward lever 41 for work. In the work mode (work main switch 51: on), the instruction of the forward / backward lever 41 for work has priority, and in the forwarding mode (work main switch 51: off), the forward / backward lever 45 for operation is given priority. Give priority to the instructions.
The parking brake braking control unit 38 controls the braking of the parking brake device 36.
The service brake braking control unit 39 controls the braking of the service brake device 37.
The construction machine control unit 31 operates when there is an instruction from the work main switch 51 to be a work mode, and operates the construction machine (road surface cutting device 30) in response to an instruction from various operators 43 for the construction machine. To control.

<Communication device>
Here, in the present embodiment, it is assumed that the non-contact communication tag 71 is attached to the attachment worn by the worker who can operate the work operator (see FIG. 1). The above-mentioned attachments are, for example, helmets, work clothes, work shoes, and the like. Further, in the present embodiment, it is assumed that the construction machine vehicle is provided with a wireless communication device 70 that wirelessly communicates with the non-contact communication tag 71. For the wireless communication device 70 and the non-contact communication tag 71, for example, a communication device that employs a known communication method using a known short-range wireless communication or the like may be adopted. In the present embodiment, the case where communication becomes impossible when the non-contact communication tag 71 is separated from the wireless communication device 70 by a predetermined distance or more is exemplified, and in the present embodiment, the minimum distance of the distance at which communication becomes impossible is defined as the separation distance. The present invention is not limited to this. The separation distance may be determined based on whether or not the communication reception strength is equal to or less than a predetermined value.

<Safety assist device 60>
Further, the present embodiment includes a safety assist device 60.
As shown in FIG. 3, the safety assist device 60 includes an assist start determination unit S20, a movement stop state determination unit S30, an engine state determination unit S40, a braking assist unit S50, an engine assist unit S60, and a first engine stop processing unit S70. A second engine stop processing unit S90 and a work safety assist unit S80 are provided.
The safety assist device 60 of the present embodiment operates when it is determined in step S10 (work mode determination unit) of FIG. 2 that the work main switch 51 is turned on and the work mode is set.
The safety assist device 60 may be configured to end the process when it detects the operation of any of the operators by the operator after the operation.

<Assist start determination unit S20>
The assist start determination unit S20 determines whether the communication distance between the wireless communication device 70 and the non-contact communication tag 71 is equal to or longer than a preset separation distance. The determination of whether or not the distance is greater than or equal to the separation distance is determined by, for example, whether or not the reception intensity is as described above.

<Movement stop state determination unit S30>
The movement stop state determination unit S30 determines whether or not the movement of the vehicle is stopped. When the movement stop state determination unit S30 determines, for example, that the vehicle speed is zero based on the detection of the vehicle speed sensor provided on the traveling wheel A and the forward / backward levers 41 and 45 are in the neutral position, the movement of the vehicle is stopped. Judged as a stopped state. Whether or not the forward / backward levers 41 and 45 are in the neutral position may be determined by the instruction information of the lever, or the state of the transmission 34 may be input from the transmission control unit 35 to determine.

<Engine state determination unit S40>
The engine state determination unit S40 determines the operating state of the engine 32. When the engine speed is constant, the engine state determination unit S40 of the present embodiment determines that the operating state of the engine 32 has not changed.
Further, when the engine rotation speed instruction is in the high rotation speed mode, the engine state determination unit S40 of the present embodiment determines that the rotation speed of the engine 32 is in a high idle state equal to or higher than the preset rotation speed. Further, when the engine rotation speed instruction is in the low rotation speed mode, the engine state determination unit S40 of the present embodiment determines that the rotation speed of the engine 32 is in a low idle state. The rotation speeds in the high idle state and the low idle state may be different from the above rotation speeds.
Here, in general, the rotation speed when the construction machine is driven is set to the full rotation speed state of the engine 32.
The engine speed may be obtained from the engine control unit 33 or the engine speed sensor.

<Brake assist unit S50>
The braking assist unit S50 operates when the assist start determination unit S20 determines that the distance is greater than or equal to the separation distance.
The braking assist unit S50 presets a state in which the movement stop state determination unit S30 determines that the stop state is reached and that the operating state of the engine 32 has not changed based on the determination of the engine state determination unit S40. If it is determined that the first standby time has continued, if the parking brake device that applies braking to the wheels is not operating, a braking command is supplied to the parking brake braking control unit to put the parking brake device into the operating state.
The first standby time may be set according to the usage status of the construction machine vehicle, but in the case of a road surface cutting vehicle, it is, for example, between 20 minutes and 30 minutes.
Whether or not the parking brake device is not activated may be determined by a signal from the parking brake braking control unit or instruction information of the parking brake operator.

<Engine assist unit S60>
The engine assist unit S60 operates when the assist start determination unit S20 determines that the distance is equal to or greater than the separation distance.
The engine assist unit S60 presets a state in which the movement stop state determination unit S30 determines that the engine is in a stopped state and determines that the operating state of the engine 32 has not changed based on the determination of the engine state determination unit S40. When it is determined that the second standby time has continued, in the case of the high idle state in which the rotation speed of the engine 32 is high, the engine issues a command to set the rotation speed of the engine 32 to the low idle state, which is a rotation speed lower than the high idle state. It is output to the control unit 33.
Here, the second waiting time is preferably longer than the first waiting time.
The second waiting time is, for example, 20 to 30 minutes longer than the first waiting time.

<First engine stop processing unit S70>
When the first engine stop processing unit S70 determines that the preset third standby time has elapsed after the low idle state is reached by the processing of the engine assist unit S60, the first engine stop processing unit S70 supplies a stop command to the engine control unit to engine. The process of stopping 32 is executed.
The third waiting time is, for example, between 20 minutes and 30 minutes.

<Work safety assist unit S80>
The work safety assist unit S80 operates when the assist start determination unit S20 determines that the distance is greater than or equal to the separation distance.
The work safety assist unit S80 presets a state in which the movement stop state determination unit S30 determines that the stop state is determined and the operating state of the engine 32 has not changed based on the determination of the engine state determination unit S40. When it is determined that the fourth standby time has continued, the operating state of the construction machine is determined, and when the construction machine is operating, the construction machine control unit 31 performs a process of stopping the operation of the operating construction machine. Run through.
The operation of the construction machine is stopped, for example, by turning off the instruction information of the work main switch.
The fourth waiting time is preferably longer than the first waiting time.
The fourth waiting time is, for example, 20 to 30 minutes longer than the first waiting time.

<Second engine stop processing unit S90>
When the second engine stop processing unit S90 determines that the preset fifth standby time has elapsed after stopping the operation of the construction machine operated by the processing of the work safety assist unit S80, the second engine stop processing unit S90 issues a stop command to the engine control unit. It supplies and executes the process of stopping the engine 32.
The fifth waiting time is, for example, between 20 minutes and 30 minutes.

(Operation and others)
When performing construction work, the construction machine vehicle of the present embodiment is provided in the work operation unit after the forward / backward lever 45 around the driver's seat is set to neutral and the work main switch 51 is turned on. Operate various work operators to perform work using construction machinery.
As a work using a construction machine, for example, a work operator is used to appropriately move a vehicle, and a road surface cutting machine 3 is used to cut a road surface.

Further, the waste material due to cutting is conveyed by the conveyor 5, and is conveyed to the loading platform of a truck or the like.
In such a state, when the worker is separated from the construction machine vehicle by a distance of more than a distance, the safety assist device 60 is activated.
Here, even if the transportation of the waste material is completed, the engine 32 is often left as it is without being stopped immediately. This is because the construction work is executed with high efficiency at full engine rotation for the operation of the construction machine, and a cool-down time of, for example, about 5 to 10 minutes is required to stop the engine 32.

In the activated safety assist device 60, when the vehicle is stopped and the engine speed is constant and there is no change for the first standby time, the braking assist unit S50 and the parking brake device 64 are in the operating state. If not, the parking brake device 64 is put into the braking state.
Here, since the engine 32 is a hydraulic source (power source) of the operating actuator of the construction machine, it is driven even when the vehicle is stopped.
Further, when the engine speed is constant and does not change, the work using the construction machine is not performed.

Then, when such a state elapses in the first standby time, braking is applied to prevent unexpected vehicle behavior such as sudden movement of the vehicle.
In the safety assist device 60, if there is no change in the operating state of the engine 32 for a predetermined time after the braking assist unit S50 is activated and braking is applied, the engine assist unit S60 puts the engine 32 in a high idle state. As a low idle state, the cooldown of the engine 32 is promoted.

Further, in the safety assist device 60, after the engine assist unit S60 is activated to put the engine 32 in a low idle state, for example, when a time has elapsed for the engine 32 to cool down, the first engine stop unit is activated. , The engine 32 is stopped.
Further, in the safety assist device 60, if there is no change in the operating state of the engine 32 for a predetermined time after the braking assist unit S50 is activated and braking is applied, the work safety assist unit S80 is activated. The operating state of the construction machine is determined, and if the construction machine is operating, the operation of the operating construction machine is stopped. As a result, the load due to the operation of the construction machine on the engine 32 is reduced.

For example, the conveyor 5 may be in an idle state even after the transportation of waste materials is completed. In this state, the operating state of the engine 32 does not change, but the construction machine is operating. It has become.
Further, in the safety assist device 60, after the work safety assist unit S80 is activated and all the operations of the construction machinery are stopped, for example, when the time when the engine 32 is expected to cool down elapses, the second engine stop unit Operates to stop the engine 32.
By the above processing of the safety assist device 60, the unexpected vehicle behavior due to the carelessness of the worker is prevented, and the engine 32 is safely stopped.

(effect)
This embodiment has the following effects.
(1) The present embodiment is a construction machine vehicle, which is a vehicle equipped with a construction machine, and has a driver's seat peripheral portion in which a plurality of driver controls for vehicle traveling are arranged and a portion away from the driver's seat peripheral portion. It is provided with a work operation unit in which a plurality of work operators for performing work using the construction machine are arranged, and the construction machine can be driven by the engine 32 for vehicle traveling as a power source. The moving stop state determination unit S30 for determining whether or not the vehicle is in a stopped state, the engine state determination unit S40 for determining the operating state of the engine 32, and the above. The state in which the movement stop state determination unit S30 determines that the vehicle is stopped and the operating state of the engine 32 has not changed based on the determination of the engine state determination unit S40 is the continuation of the preset first standby time. When it is determined that the parking brake device for braking the wheels is not operating, the braking assist unit S50 for operating the parking braking device is provided.
According to this configuration, in a construction machine vehicle in which the driving operation position of the vehicle and the working operation position at the time of work are different, if the state estimated that the vehicle is not used by the worker continues, the parking brake device is used. If it is not operating, it is possible to automatically prevent the occurrence of unexpected vehicle behavior by operating the braking by the parking brake device.

(2) In the present embodiment, the state in which the movement stop state determination unit S30 determines that the engine state is stopped and the operating state of the engine 32 has not changed based on the determination of the engine state determination unit S40. If it is determined that the second standby time set in advance has continued, in the high idle state where the rotation speed of the engine 32 is equal to or higher than the preset rotation speed, the rotation speed of the engine 32 is lower than the rotation speed in the high idle state. The engine assist unit S60 for setting the low idle state is provided.
According to this configuration, when the state estimated by the worker that the vehicle is not in use continues, the rotation speed of the engine 32 can be reduced in accordance with the braking of the vehicle.

(3) The second waiting time is preferably longer than the first waiting time.
According to this configuration, after braking by the braking assist unit S50, if the state estimated that the vehicle is not in use continues for a predetermined time, the engine speed by the engine assist unit S60 is reduced. Execute the process. That is, the engine stop process can be executed step by step.

(4) In the present embodiment, after the low idle state is set by the processing of the engine assist unit S60, when it is determined that the preset third standby time has elapsed, the first engine stop processing unit S70 for stopping the engine 32 is used. Be prepared.
According to this configuration, even if the engine 32 is in the full rotation state when the construction machine is operated, it is possible to cool down the engine 32 and then stop the engine 32.

(5) In the present embodiment, the state in which the movement stop state determination unit S30 determines that the stop state is determined and the operating state of the engine 32 has not changed based on the determination of the engine state determination unit S40. , If it is determined that the preset fourth standby time has continued, the operating state of the construction machine is determined, and if the construction machine is operating, the work safety assist unit that stops the operation of the operating construction machine. S80 is provided.
According to this configuration, when the state presumed that the vehicle is not used by the worker continues, the load due to the operation of the construction machine on the engine 32 can be reduced along with the braking of the vehicle.

(6) The fourth waiting time is preferably longer than the first waiting time.
According to this configuration, after braking by the braking assist unit S50, the state in which the vehicle is presumed to be unused continues for a predetermined time, that is, the state in which the construction machine is not used. Perform a shutdown of construction machinery if it is presumed to be continuing. That is, the process can be executed step by step.

(7) In the present embodiment, after stopping the operation of the construction machine operated by the processing of the work safety assist unit S80, when it is determined that the preset fifth standby time has elapsed, the second engine 32 is stopped. The engine stop processing unit S90 is provided.
According to this configuration, even if the engine 32 is in the full rotation state when the construction machine is operated, it is possible to cool down the engine 32 and then stop the engine 32.

(8) In the present embodiment, the non-contact communication tag 71 attached to an attachment worn by an operator who can operate the work operator, and the non-contact communication tag 71 provided on the construction machine vehicle and wireless communication with the non-contact communication tag 71. The wireless communication device 70 is provided with an assist start determination unit S20 for determining whether the communication distance between the wireless communication device 70 and the non-contact communication tag 71 is equal to or longer than a preset separation distance, and the movement stop state determination unit S30. And at least one of the determination units of the engine state determination unit S40 operates only when the assist start determination unit S20 determines that the separation distance or more.
According to this configuration, when the worker leaves the vehicle and it is difficult to respond immediately, the safety assist device 60 can be activated to prevent the occurrence of unexpected vehicle behavior.

(9) In the present embodiment, the work main switch for enabling the operation of the construction machine is provided, and the braking assist unit S50 is in an instruction state in which the work main switch enables the operation of the construction machine. Operate.
According to this configuration, it is possible to more reliably avoid the safety assist device 60 from operating while the vehicle is traveling on a public road.

1 Road cutting vehicle 2 Body 3 Road cutting machine 4 Actuator 5 Conveyor 6 Wheels 9 Driver's seat 21 Indicator board 30 Road cutting device (construction machinery)
31 Construction machine control unit 32 Engine 33 Engine control unit 34 Transmission 35 Transmission control unit 36 Parking brake device 37 Service brake device 38 Parking brake braking control unit 39 Service brake braking control unit 40 Work operation unit 41 Forward / backward lever 42 Parking brake switch 43 Various controls for construction machinery 44 Engine switch 45 Forward / backward lever 46 Accelerator pedal 47 Steering wheel 48 Brake lever 49 Foot brake 50 Driver's seat peripheral area 51 Work main switch 60 Safety assist device 70 Wireless communication device 71 Non-contact Communication tag S10 Work mode determination unit S20 Assist start determination unit S30 Movement stop state determination unit S40 Engine condition determination unit S50 Braking assist unit S60 Engine assist unit S70 First engine stop processing unit S80 Work safety assist unit S90 Second engine stop processing unit

Claims (9)

It is a construction machine vehicle that is a vehicle equipped with construction machinery,
A peripheral part of the driver's seat where a plurality of driving operators for driving a vehicle are arranged, and a plurality of work operators arranged at a place away from the peripheral part of the driver's seat and for performing work using the construction machine. It is a construction machine vehicle that is equipped with a work operation unit and can be driven by the above-mentioned construction machine using an engine for running the vehicle as a power source.
A movement stop state determination unit that determines whether or not the vehicle is in a stopped state,
The engine state determination unit that determines the operating state of the engine and
It is said that the state in which the movement stop state determination unit determines that the vehicle is stopped and the operating state of the engine has not changed based on the determination of the engine state determination unit continues for the preset first standby time. If it is determined that the parking brake device that applies braking to the wheels is not operating, the braking assist unit that activates the parking brake device and the braking assist unit
A construction machine vehicle characterized by being equipped with. It is said that the state in which the movement stop state determination unit determines that the engine is in a stopped state and that the operating state of the engine has not changed based on the determination of the engine state determination unit continues for a preset second standby time. When it is determined that the engine speed is equal to or higher than the preset rotation speed, the engine assist unit is provided to set the engine speed to the low idle state, which is lower than the high idle speed. The construction machine vehicle according to claim 1, characterized in that. The construction machine vehicle according to claim 2, wherein the second waiting time is longer than the first waiting time. 2. The construction machine vehicle according to claim 3. It is said that the state in which the movement stop state determination unit determines that the machine is stopped and the operating state of the engine has not changed based on the determination of the engine state determination unit continues for the preset fourth standby time. When the determination is made, the operating state of the construction machine is determined, and when the construction machine is operating, the work safety assist unit for stopping the operation of the operating construction machine is provided. -The construction machine vehicle according to any one of claims 3. The construction machine vehicle according to claim 5, wherein the fourth standby time is longer than the first standby time. It is characterized by having a second engine stop processing unit that stops the engine when it is determined that the preset fifth standby time has elapsed after stopping the operation of the construction machine that is operating by the processing of the work safety assist unit. The construction machinery vehicle according to claim 5 or 6. A non-contact communication tag attached to an attachment worn by a worker who can operate the above work operator,
A wireless communication device provided in the construction machine vehicle and wirelessly communicates with the non-contact communication tag,
An assist start determination unit that determines whether the communication distance between the wireless communication device and the non-contact communication tag is equal to or greater than a preset separation distance, and
Equipped with
Claims 1 to claim that at least one of the movement stop state determination unit and the engine state determination unit operates only when the assist start determination unit determines that the distance is equal to or greater than the separation distance. The construction machine vehicle according to any one of 7.
It has a work main switch that enables the operation of the above construction machinery,
The construction machine vehicle according to any one of claims 1 to 8, wherein the braking assist unit operates when the work main switch is in an instruction state for enabling the operation of the construction machine. ..

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