JP7368314B2 - construction machinery vehicle - Google Patents

Description

The present invention relates to technology related to construction machinery vehicles (vehicle-based construction machinery).

An example of a construction machinery vehicle is a road cutting vehicle equipped with a cutting object conveying device (belt conveyor, etc.) that cuts the road surface with a road cutting machine (construction machine) while traveling and conveys the cutting objects in the longitudinal direction of the vehicle body. I can give an example.
The road surface cutting vehicle has a structure described in, for example, Patent Document 1. That is, this road surface cutting vehicle is capable of self-propelling with front and rear wheels for running, and is also capable of cutting the road surface with a road surface cutting machine (cutter section) provided to the vehicle body so as to be movable up and down. Then, while the road cutting vehicle is self-propelled, the road cutting machine scrapes the asphalt pavement surface, and the scraped cutting waste is continuously conveyed to the front of the vehicle body by a conveyor.

Such construction equipment vehicles, for example, have a driver's seat provided in the upper part of the vehicle body, and a plurality of operating controls for driving the vehicle are arranged around the driver's seat, and workers operate the operating controls. Drive on public roads.
Further, in such a construction machinery vehicle, a plurality of work operators for performing work using the construction machinery are arranged at a position away from the vicinity of the driver's seat. When performing construction work, a worker operates a work operator of the work operation section to operate the construction machine while appropriately moving the vehicle for the construction work.

Japanese Patent Application Publication No. 11-50415

When the road milling machine is working, the cut asphalt road waste is continuously discharged to a dump truck placed in front of the vehicle. When the loading amount of one dump truck reaches a specified amount, a task of switching to another dump truck occurs.
During this replacement work, the road milling machine is temporarily on standby.
At this time, if the dump truck changeover time is short, the road milling machine worker will also be on standby near the vehicle in preparation for the next operation.

However, due to the limited number of dump trucks available, if the waste material processing site is far away, the waiting time may be long. If the waiting time is long, workers may engage in work other than work with the road milling machine in consideration of work efficiency.
Furthermore, in the cutting work of asphalt road surfaces, the overlay method, in which new asphalt is laid after the cutting work, is mainstream. Therefore, at the construction site, there are many workers who are engaged in various tasks below the site supervisor.

In the flow of work at the site, workers engaged in cutting work receive instructions from the site supervisor and others at any time, but in some cases they are forced to leave the vehicle for meetings or other purposes.
When another work or meeting occurs like this, normally the vehicle is put into braking mode and a safety check is performed before leaving the vehicle, but depending on the worker's carelessness, etc., the safety check process is not completed. It is also conceivable that the driver may leave the vehicle without doing so.

The present invention has been made with attention to the above-mentioned points, and aims to prevent the occurrence of unexpected vehicle behavior in construction equipment vehicles in which the driving operation position of the vehicle and the work operation position during work are different. .

In order to solve the problem, one aspect of the present invention is a construction machinery vehicle that is a vehicle equipped with construction machinery, and includes a region around a driver's seat where a plurality of driving operators for running the vehicle are arranged, and a region around the driver's seat. a work operation section, which is disposed at a location away from the construction machine, and in which a plurality of work operators for performing work using the construction machine are disposed, and the construction machine operates using an engine for driving the vehicle as a power source. A movement stop state determination unit that determines whether or not the vehicle is in a stop state where movement of the vehicle is stopped in a drivable construction machinery vehicle; an engine state determination unit that determines the operating state of the engine; When the state in which the moving stop state determining unit determines that the engine is in a stopped state and the operating state of the engine is determined to be unchanged based on the determination by the engine state determining unit continues for a preset first standby time. The gist of the present invention is to include a braking assist unit that puts the parking brake device into an activated state when the parking brake device that applies braking to the wheels is determined to be inactive.

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

1 is a side view showing a vehicle configuration according to an embodiment based on the present invention. 1 is a conceptual diagram showing a control system/braking system according to an embodiment based on the present invention. FIG. 2 is a diagram illustrating the configuration of a safety assist device.

Next, embodiments of the present invention will be described with reference to the drawings.
In this embodiment, a road cutting vehicle equipped with a road cutting device (construction machine) will be described as an example of a construction machine vehicle.
The present invention is characterized in that the driving operation position when driving on a public road (also referred to as when forwarding on a public road) is different from the work operation position for work using the construction machine at a work site, and the operation position is different from the work operation position when the construction machine is mounted on a vehicle. The present invention is applicable to construction machinery vehicles whose power source is an engine for driving the vehicle.

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

<Road cutting equipment (construction machinery)>
In this embodiment, a road milling device (construction machine) includes a road milling machine 3 that is supported to be movable up and down with respect to a vehicle body 2, an actuator 4 that raises and lowers the road milling machine 3, and a conveyor that extends in the longitudinal direction of the vehicle body. 5.
The conveyor 5 is a conveyor that conveys cutting waste scraped by the road milling machine 3 to the front of the vehicle body 2 in the longitudinal direction, and is supported by the vehicle body 2 . When the road surface is being cut, the transport conveyor 5 is set to extend forward in the longitudinal direction of the vehicle body, as shown in FIG. 1, so that the cutting waste material resulting from cutting can be transported to a truck bed or the like.

The road milling machine 3 is arranged below the vehicle body 2 between the front wheels 6A and the rear wheels 6B. The road milling machine 3 is configured such that a large number of cutter bits are provided on the circumferential surface of a cutter drum whose axis is oriented in the width direction of the vehicle body. The cutter drum is rotatably supported by the machine frame 7 and configured to be rotatably driven by a hydraulic motor (not shown). The machine frame 7 is, for example, a box-shaped frame body that is open at the bottom.
The actuator 4 that raises and lowers the road milling machine 3 is composed of a pair of left and right lifting hydraulic cylinders. Each of the lifting hydraulic cylinders 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 machine frame 7, that is, the vertical position of the road milling machine 3 relative to the vehicle body 2 (position relative to the road surface) is adjusted according to the stroke amount of the lifting hydraulic cylinder, and the cutting depth by the road milling machine 3 is adjusted. Ru. The road milling machine 3 is adjusted to either an upper standby position or a lower position in a cutting operation state.

In addition, a third hydraulic cylinder (not shown) is provided which extends obliquely in the vehicle width direction and connects the lower part of the vehicle body and the machine frame 7, and by driving the third hydraulic cylinder, the machine frame 7 can be connected to the road surface. The position of the cutting machine 3 in the vehicle width direction can be shifted left and right. Note that 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 longitudinal direction of the vehicle body 2. A pair of parallel links 8 are provided on both sides in the vehicle width direction. By providing the parallel link 8, the posture of the machine frame 7 is maintained constant as it moves up and down.

<Vehicle drive/braking system>
The road cutting device 30 such as the road cutting machine 3 described above uses power from the engine 32 as a driving source, and the elevation and rotation of the road cutting machine 3 are controlled by the construction machine control section 31 including a hydraulic circuit. (see Figure 2).
The construction machine control unit 31 can be executed by instructions using operators such as buttons provided on the instruction panel 21 for work. The instruction panel 21 is provided in the work operation section 40, and a portion of the work operation elements are provided on the instruction panel 21.

As shown in FIG. 2, the running wheels 6 of this embodiment include 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 wheels 6A can be steered by operating a steering wheel. The axle of the rear wheel 6B is connected to the engine 32 via a 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 cutting device 30 (construction machine) described above.

Further, the drive wheel 6B is provided with a parking brake device 36 and a service brake device 37 that apply braking force to the drive wheel 6B.
In addition, as shown in FIG. 2, various control units include an engine control unit 33 that controls the drive of the engine 32, a transmission control unit 35 that controls the transmission 34, and a parking brake brake that controls the parking brake device 36. A control section 38 and a service brake braking control section 39 for controlling the service brake device 37 are provided.
The vehicle also includes a plurality of driving operators and a plurality of work operators that instruct the operation of the vehicle.

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

The engine switch 44 is an operator that supplies instructions to start and stop the engine 32 to the engine control section 33.
The forward/reverse lever 45 on the driving side is an operator that indicates the vehicle running direction, has a forward position, a neutral position, and a reverse position, and is an operator that supplies set running direction information to the transmission control unit 35. It is. Further, instruction information for the forward/backward movement lever 45 on the driving 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 section 33 .
The steering wheel is an operator that instructs the steering direction.
The brake lever 48 is a parking brake operator, and its parking brake instruction is supplied to the parking brake braking control section 38.
The foot brake 49 is a service brake operator, and its service brake instruction is supplied to the service brake braking control section 39.

The work main switch 51 is a switch for switching between a work mode and a forwarding mode (a mode for driving on public roads).
By turning on the work main switch 51, the instructions from the work operators become valid.
The work main switch 51 is capable of supplying instruction information to the construction machine control section 31. The work main switch 51 of this embodiment can be switched to the work mode only when the forward/reverse lever 45 on the driving side is in the neutral position.
The instruction information of the work main switch 51 is also supplied to a safety assist device, which will be described later.

<Work operator>
The plurality of work operators are operators that give instructions for work operations using the construction machine, and are arranged in the work operation unit 40 that is remote from the driver's seat peripheral area 50. The position of the work operation unit 40 in this embodiment is such that it can be operated by a worker who is located on the road surface after getting off the vehicle.
In this embodiment, the instructions for work operations using the construction machine include instructions to the construction machine (road cutting device 30) itself and instructions regarding vehicle movement associated with the work.

In this embodiment, as shown in FIG. 2, the work operators include a forward/reverse lever 41 for work, a parking brake switch 42, various operators 43 for construction machinery, and a rotation speed switch 52.
The working forward/reverse lever 41 is an operator that instructs the vehicle running direction, has a forward position, a neutral position, and a reverse position, and is an operator that supplies set running direction information to the transmission control unit 35. It is.

The parking brake switch 42 is a parking brake operator, and its parking brake instruction is supplied to the parking brake brake control section 38.
The rotation speed switch 52 is an operator that instructs the engine control section 33 to specify the rotation speed of the engine 32 . The rotation speed instruction by the rotation speed switch 52 of this embodiment includes a high rotation speed mode in which the rotation speed is used to drive the construction machine, and a high rotation speed mode in which the construction machine is driven with no load applied to the construction machine. with a possible low rotation speed mode.

Here, in this embodiment, the engine rotation speed when the construction machine is in the high rotation speed mode and is in a state where no load is applied to the construction machine corresponds to a high idle state, which will be described later. Further, the engine rotation speed in the low rotation speed mode is a low idle state, which will be described later. The engine speed in the low idle state may be higher or lower than the engine speed in the low engine speed mode.
The various operators 43 for construction machines are operators that instruct various operations of the road cutting device 30, and the instruction information is supplied to the construction machine control unit 31. The various operators 43 for construction machines instruct, for example, to raise and lower the road milling machine 3 and to drive it to rotate.

<Control unit>
The engine control section 33 is driven when the engine switch 44 is turned on. The engine control unit 33 executes drive control of the engine 32 based on instructions from the accelerator pedal 46 and the like.
The transmission control unit 35 controls the state of the transmission 34 based on instructions from the forward/reverse lever 45 for driving and the forward/reverse lever 41 for work. In addition, in the case of the work mode (work main switch 51: ON), the instruction of the forward/backward movement lever 41 for work is given priority, and in the case of the forwarding mode (work main switch 51: OFF), the instruction of the forward/backward movement lever 45 for driving is given priority. give priority to instructions.
The parking brake brake control unit 38 controls braking of the parking brake device 36.
The service brake braking control unit 39 controls 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 in the work mode, and operates the construction machine (road cutting device 30) in response to instructions from various operators 43 for the construction machine. control.

<Communication device>
Here, in this embodiment, it is assumed that the non-contact communication tag 71 is attached to a wearable item worn by a worker who can operate a work operator (see FIG. 1). Examples of the above-mentioned wearable items include a helmet, work clothes, and work shoes. Further, in this embodiment, it is assumed that the construction equipment vehicle is provided with a wireless communication device 70 that wirelessly communicates with a non-contact communication tag 71. The wireless communication device 70 and the non-contact communication tag 71 may be, for example, communication devices that employ a known communication method using known short-range wireless communication. In this embodiment, a case is illustrated in which communication becomes impossible when the contactless communication tag 71 is separated from the wireless communication device 70 by a predetermined distance or more, and in this embodiment, the minimum 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 the reception strength of communication is below a predetermined value.

<Safety assist device 60>
Furthermore, this embodiment includes a safety assist device 60.
As shown in FIG. 3, the safety assist device 60 includes an assist start determination section S20, a movement stop state determination section S30, an engine state determination section S40, a braking assist section S50, an engine assist section S60, a first engine stop processing section S70, It includes a second engine stop processing section S90 and a work safety assist section S80.
The safety assist device 60 of this embodiment operates when it is determined in step S10 (work mode determination section) in 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 detecting an operation of any of the operators by the worker after the safety assist device 60 is activated.

<Assist start determination section 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 greater than a preset separation distance. The determination as to whether the distance is greater than or equal to the separation distance is made, for example, based on whether or not the reception strength is as described above.

<Movement stop state determination unit S30>
The movement stop state determination unit S30 determines whether the vehicle is in a stop state in which movement is stopped. For example, if the movement stop state determination unit S30 determines that the vehicle speed is zero based on the detection of the vehicle speed sensor provided on the running wheel A and that the forward/reverse levers 41 and 45 are in the neutral position, the movement of the vehicle is stopped. It is determined that the system is in a stopped state. Whether the forward/reverse levers 41, 45 are in the neutral position may be determined based on lever instruction information, or may be determined by inputting the state of the transmission 34 from the transmission control unit 35.

<Engine state determination unit S40>
Engine state determination section S40 determines the operating state of engine 32. The engine state determining unit S40 of this embodiment determines that the operating state of the engine 32 is not changing when the engine speed is constant.
Furthermore, when the engine speed instruction is a high engine speed mode, the engine state determination unit S40 of the present embodiment determines that the engine 32 is in a high idle state where the engine speed is equal to or higher than a preset rotation speed. Further, the engine state determination unit S40 of the present embodiment determines that the engine 32 is in a low idle state where the rotation speed is low when the engine rotation speed instruction is a low rotation speed mode. The rotation speeds in the high idle state and low idle state may be different from the above rotation speeds.
Here, generally, the rotation speed when driving the construction machine is set to the full rotation speed state of the engine 32.
The engine speed may be acquired from the engine control unit 33 or the engine speed sensor.

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

<Engine assist part S60>
The engine assist unit S60 operates when the assist start determination unit S20 determines that the distance is greater than or equal to the separation distance.
The engine assist section S60 has a preset state in which the moving stop state determining section S30 determines the stopped state and the operating state of the engine 32 is determined to be unchanged based on the determination of the engine state determining section S40. When it is determined that the second standby time has continued, if the engine 32 is in a high idle state where the rotation speed is high, the engine issues a command to bring the engine 32 into a low idle state, which is a rotation speed lower than the high idle state. It is output to the control section 33.
Here, it is preferable that the second standby time is longer than the first standby time.
The second standby time is, for example, 20 to 30 minutes longer than the first standby time.

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

<Work safety assist department 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 determines that the state in which the moving stop state determining unit S30 determines the stopped state and the operating state of the engine 32 is determined to be unchanged based on the determination by the engine state determining unit S40 is set in advance. If it is determined that the fourth standby time has continued, the operating state of the construction machine is determined, and if the construction machine is operating, the construction machine control unit 31 executes 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.
It is preferable that the fourth standby time is longer than the first standby time.
The fourth standby time is, for example, 20 to 30 minutes longer than the first standby time.

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

(Other operations)
When carrying out construction work, the construction equipment vehicle of this embodiment puts the forward/backward movement lever 45 around the driver's seat in neutral, and furthermore, after turning on the work main switch 51, a Perform work using construction machinery by operating various work controls.
As the work using the construction machine, for example, the road surface is cut by the road surface cutting machine 3 while the vehicle is appropriately moved using a work operator.

Further, waste materials resulting from cutting are transported by a transport conveyor 5 and transported to a truck bed or the like.
In this state, when the worker moves away from the construction equipment vehicle by a distance greater than a distance, the safety assist device 60 is activated.
Here, even after the conveyance of the waste material is finished, the engine 32 is often left as it is without stopping immediately. This is because construction work is performed with high efficiency with the engine running at full speed when operating the construction machine, and stopping the engine 32 requires a cool-down time of, for example, about 5 to 10 minutes.

The activated safety assist device 60 causes the brake assist unit S50 to activate the parking brake device 64 when the vehicle is stopped and the engine speed remains constant and unchanged for the first standby period. If not, the parking brake device 64 is brought into a braking state.
Here, since the engine 32 is a hydraulic power source (power source) for the actuator of the construction machine, it is driven even when the vehicle is stopped.
Further, a state in which the engine speed is constant and does not change is a state in which no work is being performed using the construction machine.

When such a state has elapsed for the first standby time, the brakes are 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 period of time after the brake assist unit S50 operates and applies the brakes, the engine assist unit S60 sets the engine 32 to a high idle state. The engine 32 is brought into a low idle state to promote cooling down of the engine 32.

Further, the safety assist device 60 operates the first engine stop section after the engine assist section S60 operates to put the engine 32 in a low idle state and, for example, after a period of time for the engine 32 to cool down has elapsed. , the engine 32 is stopped.
In addition, the safety assist device 60 operates the work safety assist unit S80 if there is no change in the operating state of the engine 32 for a predetermined period of time after the brake assist unit S50 operates and applies the brakes. The operating state of the construction machine is determined, and if the construction machine is in operation, the operation of the construction machine is stopped. This reduces the load on the engine 32 due to the operation of the construction machine.

For example, the conveyor 5 may be idle even after the conveyance of waste materials is completed, and in this state, there is no change in the operating condition of the engine 32, but the construction machine is in operation. It has become.
Furthermore, after the work safety assist section S80 is activated and all operations of the construction machine are stopped, the safety assist device 60 activates the second engine stop section, for example, after a period of time during which the engine 32 is expected to cool down has elapsed. is activated to stop the engine 32.
The above-described processing by the safety assist device 60 prevents unexpected vehicle behavior due to worker's carelessness, and safely stops the engine 32.

(effect)
This embodiment has the following effects.
(1) The present embodiment is a construction machinery vehicle that is a vehicle equipped with construction machinery, and includes a region around the driver's seat where a plurality of operating controls for driving the vehicle are arranged, and a region away from the region around the driver's seat. and a work operation section in which a plurality of work operators for performing work using the construction machine are arranged, and the construction machine can be driven using an engine 32 for driving the vehicle as a power source. The construction equipment vehicle is a construction equipment vehicle, and includes a movement stop state determination section S30 that determines whether or not the vehicle is in a stop state where the movement of the vehicle is stopped; an engine state determination section S40 that determines the operating state of the engine 32; The state in which the moving stop state determining unit S30 determines that the moving state is in the stopped state and the operating state of the engine 32 is determined to be unchanged based on the determination by the engine state determining unit S40 continues for a preset first standby time. If it is determined that the parking brake device that brakes the wheels is not activated, a brake assist unit S50 is provided that activates the parking brake device.
According to this configuration, in a construction equipment vehicle where the driving operation position of the vehicle and the work operation position during work are different, if the state where the vehicle is presumed to be not being used by the worker continues, the parking brake device is activated. If the parking brake device is not activated, braking by the parking brake device can be activated to automatically prevent unexpected vehicle behavior.

(2) In the present embodiment, the state in which the moving stop state determination unit S30 determines that the movement is stopped and the operating state of the engine 32 is determined to be unchanged based on the determination by the engine state determination unit S40 is When it is determined that the preset second standby time has continued, if the engine 32 is in a high idle state where the rotation speed is equal to or higher than the preset rotation speed, the engine 32 is changed to a lower rotation speed than the high idle state. The engine includes an engine assist section S60 that brings the engine into a low idle state.
According to this configuration, if the state in which the vehicle is presumed to be not being used by the worker continues, the rotational speed of the engine 32 can be reduced in conjunction with braking of the vehicle.

(3) It is preferable that the second standby time is longer than the first standby time.
According to this configuration, if the state in which the vehicle is presumed to be not in use continues for a predetermined period of time after the braking assist unit S50 applies braking, the engine rotation speed is reduced by the engine assist unit S60. Execute processing. That is, the engine stop process can be executed in stages.

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

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

(6) The fourth standby time is preferably longer than the first standby time.
According to this configuration, if the state in which the vehicle is presumed to be not in use continues for a predetermined period of time after the braking by the braking assist unit S50 is applied, that is, the state in which the construction machine is not in use continues. If it is presumed that the operation continues, stop the operation of construction machinery. That is, the process can be executed in stages.

(7) In this embodiment, when it is determined that the preset fifth standby time has elapsed after the operation of the construction machine that is in operation is stopped by the process of the work safety assisting section S80, the engine 32 is stopped. An engine stop processing section S90 is provided.
According to this configuration, even if the engine 32 is in a full rotation state when operating the construction machine, it is possible to cool down the engine 32 and then stop the engine 32.

(8) In this embodiment, a non-contact communication tag 71 attached to an item worn by a worker who can operate the work operator, and a non-contact communication tag 71 provided on the construction machinery vehicle communicate wirelessly with the non-contact communication tag 71. and an assist start determination unit S20 that determines whether a communication distance between the wireless communication device 70 and the non-contact communication tag 71 is equal to or greater than a preset separation distance, and the movement stop state determination unit S30 At least one of the engine state determining units S40 operates only when the assist start determining unit S20 determines that the distance is greater than or equal to the separation distance.
According to this configuration, when the worker leaves the vehicle and it is difficult to take immediate action, the safety assist device 60 can be activated to prevent unexpected vehicle behavior from occurring.

(9) The present embodiment includes a work main switch that enables the operation of the construction machine, and the braking assist section S50 is configured to operate when the work main switch is in an instruction state that enables the operation of the construction machine. Operate.
According to this configuration, it is possible to more reliably prevent the safety assist device 60 from operating while the vehicle is running on a public road.

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

Claims (9)

A construction machinery vehicle is a vehicle equipped with construction machinery;
A region around the driver's seat where a plurality of operation controls for driving the vehicle are arranged, and a plurality of work controls arranged at a location away from the region around the driver's seat for performing work using the construction machine. A construction machinery vehicle, comprising: a work operation unit configured to operate the construction machinery;
a work mode determination unit that determines whether the construction machine is in an operating mode in which it performs work;
a movement stop state determination unit that determines whether the vehicle is in a stop state in which movement is stopped;
an engine state determination unit that determines the operating state of the engine;
A state in which the work mode determining section determines the operating mode, the moving stop state determining section determines the stopped state, and the operating state of the engine is determined to be unchanged based on the determination of the engine state determining section. If it is determined that the preset first standby time has continued, a braking assist unit that activates the parking brake device, if the parking brake device that applies brakes to the wheels is not activated;
A construction machinery vehicle characterized by comprising: When the state in which the moving stop state determining unit determines that the engine is in a stopped state and the operating state of the engine is determined to be unchanged based on the determination by the engine state determining unit continues for a preset second standby time. If it is determined that the engine is in a high idle state where the engine speed is equal to or higher than a preset engine speed, the engine assist unit is configured to bring the engine into a low idle state where the engine speed is lower than the high idle state. The construction machinery vehicle according to claim 1, characterized in that: The construction machinery vehicle according to claim 2, wherein the second standby time is longer than the first standby time. 2. The engine according to claim 2, further comprising a first engine stop processing section that stops the engine when it is determined that a preset third standby time has elapsed after the engine enters the low idle state through the processing of the engine assist section. The construction machinery vehicle according to claim 3. When the state in which the moving stop state determining unit determines that the engine is in a stopped state and the operating state of the engine is determined to be unchanged based on the determination by the engine state determining unit continues for a preset fourth standby time. Claim 1, further comprising: a work safety assist unit that, upon determination, determines the operating state of the construction machine and, if the construction machine is operating, stops the operation of the operating construction machine. - A construction machinery vehicle according to any one of claims 3 to 3. The construction machinery vehicle according to claim 5, wherein the fourth standby time is longer than the first standby time. The invention is characterized by comprising a second engine stop processing section that stops the engine when it is determined that a preset fifth standby time has elapsed after the operation of the operating construction machine is stopped by the processing of the work safety assist section. The construction machinery vehicle according to claim 5 or 6. a non-contact communication tag attached to an item worn by a worker who can operate the work operator;
a wireless communication device installed in the construction machinery vehicle and configured to wirelessly communicate with the contactless communication tag;
an assist start determination unit that determines whether the communication distance between the wireless communication device and the contactless communication tag is equal to or greater than a preset separation distance;
Equipped with
At least one of the movement stop state determining section and the engine state determining section operates only when the assist start determining section determines that the separation distance is greater than or equal to the separation distance. Construction machinery vehicles described in any one of paragraph 7.
It has a work main switch that enables the operation of the above construction machinery,
The construction machinery vehicle according to any one of claims 1 to 8, wherein the braking assist section operates when the work main switch is in an instruction state to enable operation of the construction machinery. .

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