JP2017166202A - Compaction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compaction machine that performs compaction work with a simple operation, while ensuring desired traveling velocity and water sprinkling amount by separating an operation state of a traveling device and a sprinkler device.SOLUTION: When performing compaction work, a targeted water sprinkling amount Qtgt is set, and an upper limit velocity Vimt is set on a low rotation side when converted to an engine speed, with regard to the targeted water sprinkling amount Qtgt. When the compaction work starts, an engine 11 is operated so as to reach an engine speed Ne that allows the targeted water sprinkling amount Qtgt to be achieved, and a charging hydraulic pump 13 is driven for sprinkling water in accordance with the targeted water sprinkling amount Qtgt. At the same time, a traveling hydraulic pump 12 is driven by the engine 11 to start traveling of a vehicle 1, and a relief valve 44 is opened to discharge pressure oil for adjusting a tilting angle of the traveling hydraulic pump 12 toward an oil tank 21 side as appropriate. This way, the traveling velocity of the vehicle 1 is controlled and a sprinkled water amount per unit traveling distance is increased.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a compacting machine, and more particularly, a compacting machine including a traveling device driven by a hydrostatic power transmission (hereinafter referred to as "HST") and spraying water on a road surface by a hydraulically driven watering device sharing a power source with the HST. About.

  This type of compacting machine is used to compact paving materials in road surface paving work or the like. The front and rear parts of the car body are equipped with rolling wheels that also serve as wheels (for example, rolling tires and iron wheels), and the pavement material is tightened by the rolling wheels while running on the road surface covered with paving material such as asphalt mixture. It is solidified.

  By the way, some working machines such as compacting machines are provided with a traveling device driven by HST and a working device driven by hydraulic pressure sharing a power source with this HST. For example, a traveling hydraulic pump and a working hydraulic pump are directly connected to an engine mounted as a power source to drive each, and a traveling device is driven by pressure oil supplied from the traveling hydraulic pump to drive the vehicle, The working device is operated by pressure oil supplied from the working hydraulic pump.

  In the working machine having such a configuration, the rotational speeds of the traveling hydraulic pump and the working hydraulic pump increase or decrease in conjunction with the rotational speed of the engine. For this reason, when a desired traveling speed is achieved by adjusting the engine rotation speed by the accelerator operation, the working ability of the working device is determined accordingly. That is, there is a correlation between the operating states of the traveling device and the working device, and the operating states cannot be adjusted individually.

  This characteristic may be inconvenient when performing work with a work machine. For example, in the paving work using the compaction machine described above, since the paving material under construction is hot (eg, 140 ° C), it is closed during the paving work unless it is lowered to a temperature that does not cause wrinkles (eg, 50 ° C or less). The road cannot be opened. Therefore, water is sprayed on the road surface from the water nozzle provided at the rear of the compaction machine. To promote the cooling of the pavement material, a large amount of water is required while the vehicle is traveling at a low speed in order to increase the amount of water sprayed per unit travel distance. Need to water. However, since there is a correlation between the operating states of the traveling device and the working device as described above, if the engine speed is increased by operating the accelerator to achieve the required amount of watering, the traveling speed of the vehicle increases, resulting in As a result, the amount of water per unit mileage does not change at all.

For example, the wheel loader described in Patent Document 1 can increase or decrease the amount of oil discharged from the traveling hydraulic pump regardless of the engine rotation speed. And the operating state is disconnected. Specifically, the differential pressure between the primary side and the secondary side of the orifice is adjusted according to the opening and closing of the needle valve, and the amount of oil discharged from the traveling hydraulic pump is increased or decreased according to the differential pressure. When you want to operate the bucket, which is a working device, while driving the vehicle at a low speed, after adjusting the engine speed so that the amount of oil discharged from the working hydraulic pump required for the operation of the bucket can be secured, Operate the needle valve in the opening direction. As a result, the differential pressure at the orifice can be reduced, and the traveling speed can be lowered as the amount of oil discharged from the traveling hydraulic pump decreases.
The technique of Patent Document 1 relates to a wheel loader, but can also be applied to a compacting machine.

JP 2003-83447 A

  To briefly express the technique of Patent Document 1, the operating state of the traveling device is separated from the operating state of the work device by changing the control gain of the discharge oil amount of the traveling hydraulic pump with respect to the engine rotation speed. For this reason, if this technology is applied to a compacting machine, a large amount of water can be sprinkled while the vehicle is traveling at a low speed, and cooling of the pavement can be efficiently promoted. However, there is room for improvement in terms of user convenience. There is.

  That is, the operator during the compacting operation adjusts the engine rotation speed, and thus the traveling speed, by the accelerator operation. In this compaction operation, although the increase or decrease in the travel speed becomes dull with respect to the change in the accelerator operation amount due to the change in the control gain, it is different from the normal travel in that the adjustment of the accelerator operation amount is necessary to maintain the desired travel speed. No difference. Therefore, it is necessary for the operator to always maintain a predetermined accelerator operation amount during the compaction work. In particular, since the compaction work is performed by repeatedly moving the vehicle forward and backward, the accelerator operation amount is adjusted again each time. There is a problem that the necessity of the operation becomes complicated and the operator is made tired.

  The present invention has been made to solve such problems, and the object of the present invention is to make it possible to achieve the desired traveling speed and watering amount by separating the operating state of the traveling device and the watering device. Thus, an object of the present invention is to provide a compacting machine capable of performing compaction work by a simple operation.

  According to the first aspect of the present invention, there is provided a traveling hydraulic motor that is operated by pressure oil from a traveling hydraulic pump driven by a power source to drive the vehicle, and pressure oil from a water spray hydraulic pump that is driven by the power source. Watering hydraulic motor that operates to spray water on the road surface, watering command means for instructing watering on the road surface, traveling speed detection means for detecting the traveling speed of the vehicle, and upper limit speed setting for setting the upper limit speed of the vehicle Means, a rotational speed setting means for setting the rotational speed of the power source, an oil amount limiting means capable of arbitrarily limiting the amount of oil supplied from the traveling hydraulic pump to the traveling hydraulic motor, and a water spray command means to the road surface When the water spray is commanded, the power source is operated so that the rotational speed set by the rotational speed setting means is obtained, and the oil amount limiting means is set based on the traveling speed detected by the traveling speed detecting means. And your, characterized in that a running-water spray control means for limiting the travel speed of the vehicle to the upper speed limit set by the upper limit speed setting means.

When watering to the road surface is instructed by the watering instruction means, the power source is operated based on the rotation speed set by the rotation speed setting means. Since the pressure oil is supplied from the watering hydraulic pump to the watering hydraulic motor in accordance with the rotational speed of the power source, watering is performed on the road surface with the amount of watering corresponding to the rotational speed at this time. On the other hand, the oil amount limiting means is controlled based on the traveling speed detected by the traveling speed detecting means, the amount of oil supplied from the traveling hydraulic pump to the traveling hydraulic motor is limited, and the traveling speed of the vehicle is set to the upper limit speed setting. It is limited to the upper limit speed set by the means. As a result, the vehicle travels at a traveling speed lower than the traveling speed corresponding to the sprinkling amount while achieving the sprinkling amount according to the set rotational speed. Therefore, the amount of water per unit mileage can be increased to promote cooling of the pavement material, and the road closed for pavement work can be opened early.
Then, since the traveling speed of the vehicle is limited to the upper limit speed set by the upper limit speed setting means, for example, the operator keeps the accelerator pedal fully depressed or without depressing the accelerator pedal. The traveling speed can be kept at the upper limit speed, and fatigue due to driving operation is reduced.

The invention of claim 2 includes an accelerator operation amount detection means for detecting an accelerator operation amount, and the travel / watering control means is detected by the accelerator operation amount detection means in a state where watering to the road surface is instructed by the watering instruction means. When the accelerator operation amount reaches a predetermined value, the rotational speed of the power source is increased stepwise to the rotational speed set by the rotational speed setting means, and the traveling speed of the vehicle is limited to the upper limit speed. .
Therefore, it becomes possible to keep the traveling speed of the vehicle at the upper limit speed while the operator fully depresses the accelerator pedal, and fatigue due to driving operation is reduced.

According to a third aspect of the present invention, the accelerator operation amount detection means for detecting the accelerator operation amount is provided, and the traveling / watering control means is detected by the accelerator operation amount detection means with the rotation speed set by the rotation speed setting means as an upper limit. The rotational speed of the power source is increased according to the increase in the amount of accelerator operation, and when the vehicle traveling speed reaches the upper limit speed, the upper limit speed is limited. The rotational speed of the power source is set by the rotational speed setting means. It is characterized by suppressing the increase in rotation when reaching.
Therefore, it is possible to keep the vehicle traveling speed at the upper limit speed while the operator fully depresses the accelerator pedal, reducing fatigue due to driving operation, and arbitrarily depending on the amount of accelerator operation. Can be increased or decreased.

According to a fourth aspect of the present invention, the accelerator operation amount detection means for detecting the accelerator operation amount is provided. When the running / sprinkling control means is instructed to sprinkle the road surface by the water spray instruction means, the accelerator operation amount detection means The rotation speed of the power source is increased according to the detected increase in the accelerator operation amount, and the rotation speed of the power source is set by the rotation speed setting means when the accelerator operation amount detection means detects the accelerator fully open. The rotational speed of the power source and the oil amount limiting means are controlled so that the rotational speed is reached and the traveling speed of the vehicle reaches the upper limit speed.
Therefore, it is possible to keep the vehicle traveling speed at the upper limit speed while the operator fully depresses the accelerator pedal, reducing fatigue due to driving operation, and arbitrarily depending on the amount of accelerator operation. Can be increased or decreased.

The invention of claim 5 is provided with a self-running command means for commanding running of the vehicle when the accelerator pedal is not operated, and the running / sprinkling control means is instructed to sprinkle water on the road surface by the sprinkling command means. When the command means is operated, the power source is operated so that the rotation speed set by the rotation speed setting means is obtained even if the accelerator pedal is not operated.
Therefore, it becomes possible to keep the traveling speed of the vehicle at the upper limit speed without the operator depressing the accelerator pedal, and fatigue due to the driving operation is reduced.

The invention of claim 6 includes a sprinkling amount increase mode command means for commanding a sprinkling amount increase mode in which the sprinkling amount is increased with respect to the traveling speed of the vehicle. When watering is commanded and the watering rate increase mode is commanded by the watering rate increase mode command means, the operation of the power source based on the set rotational speed and the travel speed limitation based on the upper limit speed are executed. It is characterized by.
Since the control by the running / sprinkling control means is performed on the condition that the sprinkling amount increasing mode is commanded, when the sprinkling amount increasing mode is not commanded, another sprinkling mode, for example, the traveling speed and sprinkling amount according to the engine speed It is possible to execute a normal watering mode that increases and decreases in correlation with each other.

According to the seventh aspect of the present invention, the rotational speed setting means sets the rotational speed at least on the lower rotation side than the lower limit value, with the rotational speed when the upper limit speed set by the upper limit speed setting means is achieved as the lower limit value. It is configured to be prohibited.
Since the rotation speed setting means always sets a rotation speed higher than the rotation speed corresponding to the upper limit speed set by the upper limit speed setting means, it is possible to prevent erroneous setting by the operator.

In the invention according to claim 8, the upper limit speed setting means prohibits the setting of the upper limit speed corresponding to the rotation speed higher than the upper limit value with the rotation speed set by the rotation speed setting means as the upper limit value. It is characterized by being configured.
Since the upper limit speed setting means always sets the upper limit speed corresponding to the rotation speed lower than the rotation speed set by the rotation speed setting means, it is possible to prevent erroneous setting by the operator.

  According to the present invention, the operation state of the traveling device and the watering device can be separated to achieve a desired traveling speed and watering amount, and the compacting operation can be performed by a simple operation.

It is a side view showing a tire roller of an embodiment. It is a block diagram which shows the hydraulic circuit and control circuit of a tire roller. It is a characteristic figure which shows the control condition of the running speed with respect to the engine speed in the watering amount increase mode of 1st, 2nd, 4th embodiment, and watering amount. It is a characteristic view which shows the control condition of the running speed with respect to the engine speed in the watering amount increase mode of 3rd Embodiment, and the watering amount.

Hereinafter, an embodiment in which the present invention is embodied in a tire roller will be described.
FIG. 1 is a side view showing the tire roller of the present embodiment. In the following description, the front-rear direction and the left-right vehicle width direction are defined mainly with respect to the vehicle.
The front part of the body 2 of the tire roller 1 (hereinafter sometimes referred to as a vehicle) is provided with three rubber front rolling tires 3f that also serve as wheels, and these front rolling tires 3f are They are arranged in parallel in the left-right direction. Further, four rubber rear rolling tires 3r that also serve as wheels are provided at the rear of the vehicle body 2, and these rear rolling tires 3r are arranged in parallel in the left-right direction.

  An operation console 5 having a steering 4 is installed on the vehicle body 2, a seat 6 is installed on the rear side of the operation console 5, and a roof 7 is provided so as to cover the operation console 5 and the seat 6 from above. ing. An operator seated on the seat 6 runs the tire roller 1 by operating the steering pedal 4 and an accelerator pedal and a brake pedal (not shown) under the foot, and laid on the road surface by the front and rear compaction tires 3f and 3r during the paving work. Compact paving material.

  A pair of left and right watering nozzles 9 are provided at the rear part of the vehicle body 2, and these watering nozzles 9 are connected to a water storage tank 10 installed in the vehicle body 2, and water stored in the water storage tank 10 is sprinkled on the road surface. It is like that. The tire roller 1 is also provided with watering nozzles for the front and rear rolling tires 3f and 3r, but the description thereof is omitted because it is not directly related to the present invention.

FIG. 2 is a configuration diagram showing a hydraulic circuit and a control circuit of the tire roller 1.
First, the configuration of the hydraulic circuit will be described. The tire roller 1 of the present embodiment includes an HST-driven traveling device and a watering device as a working device mounted in the vehicle body 2, and these devices share the engine 11 as a power source. A variable displacement traveling hydraulic pump 12, a charging hydraulic pump 13 (watering hydraulic pump), and a steering / braking hydraulic pump 14 are directly connected to the engine 11. The hydraulic pumps 12 to 14 are driven by the engine 11. It has become so.

  The traveling hydraulic pump 12 functions as a pressure oil supply source for the traveling device. For this purpose, the traveling hydraulic pump 12 is connected to a pair of left and right variable displacement traveling hydraulic motors 17 via hydraulic pipes 15 and 16, respectively. These traveling hydraulic motors 17 are connected to the left and right rear rolling tires 3r. They are linked to each other. When the tire roller 1 travels, the pressure oil discharged from the traveling hydraulic pump 12 is supplied to the traveling hydraulic motor 17 through the hydraulic pipes 15 and 16, and the left and right rear rolling tires 3 r are driven by these traveling hydraulic motors 17. Are driven to rotate. The traveling hydraulic pump 12 is configured as a swash plate type or oblique axis type axial piston pump, and its tilt angle is adjusted by a tilt angle adjusting circuit in accordance with the work load of the vehicle, details of which will be described later.

  The charging hydraulic pump 13 functions as a pressure oil supply source for the watering device, and also functions as a pressure oil supply source for adjusting the tilt angle of the traveling hydraulic pump 12. For this purpose, the suction side of the charging hydraulic pump 13 is connected to the oil tank 21 via the hydraulic pipe 20, and the discharge side of the charging hydraulic pump 13 branches from the hydraulic pipe 22 via the hydraulic pipe 22 and the watering control valve 23. Pressure oil is connected to the hydraulic piping 27 and supplied to the pressure adjusting circuit 31 through the orifice 27a. The discharge side of the charging hydraulic pump 13 is connected to one port of a watering hydraulic motor 24 via a hydraulic pipe 25 so as to bypass the watering control valve 23, and the watering hydraulic motor 24 is connected via a hydraulic pipe 26. The oil tank 21 is also connected. The other port of the watering hydraulic motor 24 is connected to the hydraulic pipe 22, and pressure oil is supplied to the pressure adjusting circuit 31 through the branching hydraulic pipe 27 and the orifice 27 a.

  When the watering control valve 23 is opened, the pressure oil from the charging hydraulic pump 13 is supplied to the hydraulic pipe 27 by bypassing the watering hydraulic motor 24 via the hydraulic pipe 22. Therefore, the hydraulic motor 24 does not rotate. Further, when the watering control valve 23 is closed, the pressure oil from the charging hydraulic pump 13 is supplied to one port of the watering hydraulic motor 24 through the hydraulic pipe 25, and the watering hydraulic motor 24 rotates and the hydraulic motor Pressure oil is supplied from the other port 24 to the hydraulic piping 27 side.

  A watering pump 28 is directly connected to the watering hydraulic motor 24, and the watering pump 28 is connected to the water storage tank 10 through a water supply pipe 29 and is connected to the watering nozzle 9 described above through a water supply pipe 30. When the watering pump 28 rotates together with the watering hydraulic motor 24 in accordance with the switching of the watering control valve 23, the water in the water storage tank 10 is sprinkled from the watering nozzle 9 through the water supply pipes 29 and 30. A watering device is constituted by the hydraulic circuit and the watering circuit including the charging hydraulic pump 13, the watering hydraulic motor 24, the watering pump 28 and the watering nozzle 9.

  Although not shown, a power steering system hydraulic circuit and a brake system hydraulic circuit are connected to the steering / braking hydraulic pump 14. Upon receiving the pressure oil supplied from the steering / braking hydraulic pump 14, the steering operation is assisted by the hydraulic circuit of the power steering system, and the braking force according to the brake pedal operation is generated by the hydraulic circuit of the brake system. ing.

The hydraulic piping 27 from the watering hydraulic motor 24 described above is connected to the tilt angle adjusting circuit 32 via the pressure adjusting circuit 31.
First, the pressure adjustment circuit 31 will be described. The pressure adjustment circuit 31 includes a pressure adjustment valve 33 and a charge relief valve 34, and the hydraulic pipe 27 is connected to the pressure adjustment valve 33. The pressure adjusting valve 33 is switched according to the hydraulic pressure acting on the servo chamber, and the pressure oil supplied via the hydraulic pipe 27 is shut off at the central position. At the right position of the pressure adjustment valve 33, the pressure oil from the hydraulic pipe 27 is supplied to the tilt angle adjustment circuit 32 via the hydraulic pipe 35, and conversely at the left position, the pressure oil from the tilt angle adjustment circuit 32 is supplied to the hydraulic pipe. The oil is discharged to the oil tank 21 through 36. As a result, the tilt angle adjusting circuit 32 is appropriately supplied with the pressure oil from the hydraulic pipe 27, and, for example, when the vehicle 1 is climbing up, the pressure adjusting valve 33 is switched to the left position due to the hydraulic pressure increase in the servo chamber. The engine stop caused by the overload of the engine 11 due to the circuit pressure increase is prevented.

The hydraulic piping 27 is connected to the oil tank 21 via the charge relief valve 34, and the circuit pressure of the hydraulic piping 27 is kept constant.
The hydraulic circuit including the traveling hydraulic pump 12, the traveling hydraulic motor 17, and the hydraulic pipes 15 and 16 is configured as a closed circuit. However, due to the structure of the pump 12 and the motor 17, some leakage of pressure oil occurs. . For this reason, a part of the pressure oil discharged from the charging hydraulic pump 13 is appropriately replenished, but the configuration is not related to the gist of the invention, and the description thereof is omitted.

  Next, the tilt angle adjusting circuit 32 will be described. The tilt angle adjusting circuit 32 includes a forward / reverse switching valve 38 and a servo piston 39. The hydraulic piping 35 from the pressure adjusting valve 33 is connected to a forward / reverse switching valve 38, and the forward / backward switching valve 38 is connected to the left and right cylinder chambers 39a, 39b of the servo piston 39 via hydraulic piping 40, 41. The tilt angle of the traveling hydraulic pump 12 is adjusted according to the movement of the rod 39c.

  The forward / reverse switching valve 38 is switched by an electric signal corresponding to the lever operation of the vehicle 1, and the pressure oil from the pressure adjusting valve 33 is shut off at the neutral position. Further, at the right position of the forward / reverse switching valve 38, pressure oil is supplied to the cylinder chamber 39a on the left side of the servo piston 39, and at the left position, pressure oil is supplied to the cylinder chamber 39b on the right side of the servo piston 39 and on the non-supply side. The pressure oil in the cylinder chambers 39 a and 39 b is discharged to the oil tank 21 through the hydraulic pipe 42. Therefore, the moving direction of the piston rod 39c of the servo piston 39 is determined according to the switching of the forward / reverse switching valve 38, and the moving amount is adjusted by the control pressure generated by the pressure adjusting circuit 31. As a result, the tilt angle of the traveling hydraulic pump 12 changes and the amount of discharged oil (pump capacity) is adjusted.

As a result, the tilt angle of the traveling hydraulic pump 12 and the amount of discharged oil are always adjusted to the optimum value according to the work load of the vehicle 1. For example, when traveling at high speed, the displacement of the traveling hydraulic pump 12 is adjusted to the maximum value, and the displacement of the traveling hydraulic motor 17 is adjusted to the minimum value. At the time of maximum traction, the displacement of the traveling hydraulic pump 12 is adjusted to the minimum value, and the displacement of the traveling hydraulic motor 17 is adjusted to the maximum value.
A traveling device is constituted by the hydraulic circuit including the traveling hydraulic pump 12, the traveling hydraulic motor 17, the pressure adjusting circuit 31, and the tilt angle adjusting circuit 32 described above.

  The hydraulic pipe 35 connecting the pressure adjustment valve 33 and the forward / reverse switching valve 38 is connected to the oil tank 21 via the hydraulic pipe 43, and a relief valve 44 (oil amount limiting means) is connected to the hydraulic pipe 43. ing. By controlling the pressure of the relief valve 44, the control pressure can be lowered regardless of the control pressure generated by the pressure adjusting valve 33 in proportion to the engine rotational speed Ne. That is, as will be described in detail later, by opening the relief valve 44 and adjusting the pressure, the amount of oil discharged from the traveling hydraulic pump 12 is reduced to a value lower than the value corresponding to the normal engine speed Ne. .

Next, the configuration of the control circuit will be described.
The ECU 51 that controls the tire roller 1 includes an input / output device (not shown), a storage device (ROM, RAM, etc.) used for storing control programs and control maps, a central processing unit (CPU), a timer counter, and the like. Yes. On the input side of the ECU 51, a wheel speed sensor 52 (traveling speed detecting means) for detecting the wheel speed of the rear rolled tire 3r, an accelerator sensor 54 (accelerator operating amount detecting means) for detecting an operation amount θacc of the accelerator pedal 53, A watering switch 55 (watering instruction means), a watering mode selection switch 56 (watering amount increase mode instruction means), a watering amount setting switch 57 (rotational speed setting means), and an upper limit speed setting switch 58 (upper limit speed setting means) are connected. ing.

The watering switch 55 is a switch for selecting execution / stop of watering during the compacting operation, and watering is executed during the ON operation, and watering is stopped during the OFF operation.
The watering mode selection switch 56 is a switch that selects a normal watering mode and a watering amount increase mode as the watering mode. The normal watering mode is the watering mode selected in normal compaction work, and the watering amount increase mode is to increase the watering amount per unit mileage in order to open the closed road at the early stage of paving work. It is a watering mode that promotes cooling of the pavement material.

  The sprinkling amount setting switch 57 is a switch for setting the target sprinkling amount Qtgt in the sprinkling amount increasing mode. As will be described later, the engine rotation speed Ne and eventually the rotation speed of the watering pump 28 are controlled according to the target watering amount Qtgt set by the watering amount setting switch 57, and the watering amount from the watering nozzle 9 is adjusted.

  In the present embodiment, the target watering amount Qtgt is set so that the operator can easily grasp the watering amount intuitively, but the present invention is not limited to this. The actual watering amount is determined by the engine rotation speed Ne, and the two are correlated. For example, the engine rotation speed Ne may be set instead of the target watering amount Qtgt (rotation speed setting means). . Alternatively, the target water spray amount Qtgt may be set as a three-stage mark of “low”, “medium”, and “high”, and the operator may select the desired mark (rotation speed setting means).

The upper limit speed setting switch 58 is a switch for setting an upper limit Vimt of the traveling speed V of the vehicle 1 in the sprinkling amount increase mode. As will be described later, even if the accelerator pedal 53 is depressed beyond the set upper limit speed Vimt, the traveling speed V of the vehicle 1 is suppressed to the upper limit speed Vimt. The ECU 51 sequentially calculates the traveling speed V from the wheel speed detected by the wheel speed sensor 52 while the vehicle 1 is traveling, and based on the comparison between the traveling speed V and the upper limit speed Vimt, the traveling speed V of the vehicle 1 is determined as the upper limit speed Vimt. Limit to.
Further, the engine 11, the relief valve 44 and the watering control valve 23 are connected to the output side of the ECU 51, and a display unit 59 provided on the operation console 5 is connected.

  The tire roller 1 of the present embodiment is configured as described above. By the way, as described in [Problems to be Solved by the Invention], in the technique of Patent Document 1, the control gain of the amount of oil discharged from the traveling hydraulic pump 12 with respect to the engine rotational speed Ne is changed, so The operating state is disconnected from the operating state of the work device. For this reason, if the technology is applied to a compacting machine, a large amount of water can be sprinkled while the vehicle 1 is traveling at a low speed. However, it is necessary for the operator to always maintain a predetermined accelerator operation amount θacc during the compacting operation. There is.

  Therefore, in the tire roller 1 of the present embodiment, when the water sprinkling amount increasing mode is selected, the amount of oil discharged from the traveling hydraulic pump 12 is reduced by opening the relief valve 44, whereby the accelerator operation amount θacc. Even if the accelerator is fully opened without adjusting the vehicle, the vehicle 1 can travel at a low speed. Hereinafter, processing executed by the ECU 51 for the control will be described. Prior to that, an overview of overall control will be described.

FIG. 3 is a characteristic diagram showing a control state of the traveling speed V and the watering amount Q with respect to the engine rotation speed Ne in the watering amount increasing mode.
As described above, the traveling hydraulic pump 12 and the charging hydraulic pump 13 are directly connected to the engine 11. For this reason, when the engine rotational speed Ne increases, the amount of oil discharged from the traveling hydraulic pump 12 increases and the traveling speed V increases as the traveling hydraulic motor 17 increases in rotation, and the amount of oil discharged from the charging hydraulic pump 13 increases. As the water spray hydraulic motor 24 (= water spray pump 28) increases in rotation, the water spray amount Q increases. The travel hydraulic pump 12 changes its capacity depending on the engine rotational speed Ne, but after reaching the maximum capacity, the travel speed V increases in proportion to the engine rotational speed Ne. In FIG. 3, the scale of the vertical axis is set so that the traveling speed V and the sprinkling amount Q coincide with each other at the same engine speed Ne for easy understanding. For this reason, the line LV of the running speed V and the line LQ of the sprinkling amount Q increase from the points aV and aQ, respectively, and the engine rotational speed Ne equal to or higher than the point d always matches on the line L in FIG. The line L moves in the same direction according to the increase / decrease in the rotational speed Ne. This characteristic means that there is a correlation between the operating states of the traveling device and the working device.

  The basic characteristics are as described above. During the accelerator operation, as shown in FIG. 3, the engine 11 is operated so that the engine rotation speed Ne can achieve the target watering amount Qtgt set by the watering amount setting switch 57. (Running / watering control means). Then, the upper limit speed setting switch 58 sets the upper limit speed Vimt to the low rotation side with respect to the target watering amount Qtgt, and the actual traveling speed V becomes the upper limit speed Vimt. By opening the relief valve 44, the amount of oil discharged from the traveling hydraulic pump 12 is adjusted (traveling / watering control means). As a result, while achieving the target watering amount Qtgt, it is possible to drive the vehicle 1 at a traveling speed V lower than the traveling speed V corresponding to the target watering amount Qtgt to promote the cooling of the pavement material. This characteristic means that the operating state of the traveling device is disconnected from the operating state of the watering device.

  Since the actual traveling speed V of the vehicle 1 is adjusted to the upper limit speed Vimt during the accelerator operation, the vehicle 1 can travel at a very low speed even if it is fully opened without adjusting the accelerator operation amount θacc. Watering a larger amount than the watering amount Q corresponding to V can be performed.

Specific embodiments will be described below.
[First Embodiment]
When the operator selects the sprinkling amount increase mode with the sprinkling mode selection switch 56, the operator sets the target sprinkling amount Qtgt with the sprinkling amount setting switch 57 and sets the upper limit speed Vimt with the upper limit speed setting switch 58. In order to obtain the above-mentioned action and effect relating to the promotion of cooling of the pavement material, it is necessary to set the upper limit speed Vimt to the low rotation side in terms of the engine rotation speed with respect to the target watering amount Qtgt. If not, there is a possibility of erroneous setting (the upper limit speed Vimt is set on the higher rotation side than the target watering amount Qtgt).

Therefore, when the upper limit speed Vimt is set first, the ECU 51 sets the engine speed Ne corresponding to the upper limit speed Vimt (the engine speed Ne when the upper limit speed Vimt is achieved) to the lower limit value (in FIG. 3). Point b). When the target water spray amount Qtgt corresponding to the engine speed Ne on the lower rotation side than the lower limit value is set, “error” is displayed on the display unit 59 to prompt resetting. By this processing, setting of the target watering amount Qtgt on the lower rotation side than the upper limit speed Vimt is prohibited in terms of engine rotation speed, and the target watering amount Qtgt is always set as a value on the higher rotation side than the upper limit speed Vimt.
In order to increase the sprinkling amount Q with respect to the traveling speed V with certainty, the lower limit value may be set higher than the engine speed Ne corresponding to the upper limit speed Vimt by a predetermined value.

  Further, when the target watering amount Qtgt is set in advance, the ECU 51 sets the engine rotational speed Ne corresponding to the target watering amount Qtgt (the engine rotational speed Ne when the target watering amount Qtgt is achieved) to the upper limit value ( Consider point c) in FIG. When the upper limit speed Vimt corresponding to the engine speed Ne higher than the upper limit value is set, “error” is displayed on the display unit to prompt resetting. By this processing, setting of the upper limit speed Vimt on the higher rotation side than the target sprinkling amount Qtgt is prohibited in terms of engine rotation speed, and the upper limit speed Vimt is always set as a value on the lower rotation side than the target sprinkling amount Qtgt.

In order to reliably increase the water spray amount Q with respect to the traveling speed V, an upper limit value may be set on the low rotation side by a predetermined value from the engine rotational speed Ne corresponding to the target water spray amount Qtgt.
By the above-described processing of the ECU 51, the upper limit speed Vimt is always set to the low rotation side in terms of the engine rotation speed with respect to the target watering amount Qtgt, so that erroneous setting of the operator can be prevented beforehand.

  When the target watering amount Qtgt and the upper limit speed Vimt are thus set, the compacting operation is started in accordance with the accelerator operation by the operator and the operation of the watering switch 55. When the accelerator pedal 53 is not depressed, the ECU 51 idles the engine 11 and keeps the vehicle 1 in a creep state as indicated by a point a in FIG. When the operation of the accelerator pedal 53 is started in a state where the watering switch 55 is turned on, and the accelerator operation amount θacc reaches a value (= predetermined value) corresponding to the upper limit speed Vimt, the ECU 51 sets the target watering amount Qtgt. The engine 11 is controlled to increase stepwise up to the corresponding engine speed Ne. The timing for increasing the engine rotational speed Ne is not limited to this. For example, when the accelerator operation amount θacc increases from 0 (<predetermined value), or when the accelerator operation amount θacc corresponding to the target watering amount Qtgt (= predetermined). When the value reaches (value), the engine speed Ne may be increased stepwise.

  By increasing the engine rotation speed Ne, watering of the target watering amount Qtgt is performed. When the traveling hydraulic pump 12 is driven at the engine rotational speed Ne at this time, the traveling speed V of the vehicle 1 exceeds the upper limit speed Vimt, but the ECU 51 opens the relief valve 44 to open the traveling hydraulic pump 12. The traveling speed V is limited to the upper limit speed Vimt by adjusting the amount of discharged oil.

  The traveling speed V of the vehicle 1 is controlled to a point b on the line L in FIG. 3, and the water spray amount Q to the road surface is controlled to a point c in FIG. As a result, the vehicle 1 travels at a traveling speed V lower than the traveling speed V corresponding to the target sprinkling amount Qtgt while achieving the target sprinkling amount Qtgt. Cooling can be promoted and roads closed for paving can be opened early.

  The control state of the sprinkling amount Q and the traveling speed V by the ECU 51 does not change even if the accelerator operation amount θacc further increases. For example, even when the accelerator is fully opened, the traveling speed V is at point b and the sprinkling amount Q is at point c. Continue to be controlled. Therefore, since the operator can keep the traveling speed of the vehicle 1 at the upper limit speed Vimt while fully depressing the accelerator pedal 53, the fatigue due to the driving operation can be greatly reduced.

[Second Embodiment]
The setting of the target watering amount Qtgt and the upper limit speed Vimt by the operator is the same as in the first embodiment described above. Similarly, when the accelerator pedal 53 is not depressed, the engine 11 is idled by the ECU 51 and the vehicle 1 is kept in the creep state. In the present embodiment, when the depression operation of the accelerator pedal 53 is started, the ECU 51 gradually increases the engine rotation speed Ne in proportion to the increase in the accelerator operation amount θacc. Since the rotational speeds of the traveling hydraulic pump 12 and the charging hydraulic pump 13 increase with the engine rotational speed Ne, the traveling speed V of the vehicle 1 and the amount of water spray Q on the road surface increase accordingly. When the traveling speed V reaches the upper limit speed Vimt, the ECU 51 opens the relief valve 44 to adjust the amount of oil discharged from the traveling hydraulic pump 12, thereby restricting the traveling speed V of the vehicle 1 to the upper limit speed Vimt. .

  Even if the accelerator operation amount θacc further increases, the traveling speed V continues to be controlled to the upper limit speed Vimt, that is, the point b in FIG. 3, whereas the engine speed Ne continues to increase as the accelerator operation amount θacc increases. When the engine rotation speed Ne increases to a value corresponding to the target water spray amount Qtgt, the ECU 51 suppresses an increase in the engine rotation speed Ne. For this reason, even if the accelerator operation amount θacc further increases, the water spray amount Q continues to be controlled to the target water spray amount Qtgt, that is, the point c in FIG.

  As a result, the vehicle 1 travels at a traveling speed V lower than the traveling speed V corresponding to the target watering amount Qtgt while achieving the target watering amount Qtgt as in the first embodiment, so that the cooling of the pavement material is promoted. Can do. Further, since the worker at this time can keep the traveling speed of the vehicle 1 at the upper limit speed Vimt while fully depressing the accelerator pedal 53, the fatigue due to the driving operation can be greatly reduced.

Furthermore, in the present embodiment, in the lower speed range than the point b corresponding to the upper limit speed Vimt, the traveling speed V of the vehicle 1 can be arbitrarily increased or decreased in proportion to the accelerator operation amount θacc, so that the compacting operation can be performed more easily. There are also advantages.
By the way, it can replace with the control characteristic of FIG. 3 demonstrated in the above 1st and 2nd embodiment, and can also control based on the characteristic shown in FIG. 4, and is demonstrated as 3rd Embodiment below.

[Third Embodiment]
FIG. 4 is a characteristic diagram showing a control state of the traveling speed V and the watering amount Q with respect to the engine rotation speed Ne in the watering amount increasing mode of the third embodiment.

  The overall characteristics are the same as those shown in FIG. 3, and the line LV of the running speed V and the line LQ of the sprinkling amount Q always coincide on the line L at the engine rotational speed Ne equal to or higher than the point d. In FIG. 4, the ECU 51 is controlled such that the traveling speed V becomes the upper limit speed Vimt at the point e where the accelerator operation amount θ on the horizontal axis becomes the maximum, and the sprinkling amount Q becomes the target sprinkling amount Qtgt. Is different.

Specifically, with respect to the water spray amount Q, the engine rotation speed Ne is controlled based on the accelerator operation amount θ, whereby the water spray amount Q increases along the line L as the accelerator operation amount θ increases, and the accelerator operation amount θacc. The water sprinkling amount Q reaches the target water sprinkling amount Qtgt at the point e where becomes the maximum.
Further, with respect to the traveling degree V, the valve opening state of the relief valve 44 (and hence the amount of oil discharged from the traveling hydraulic pump 12) is controlled based on the accelerator operation amount θ, whereby the vehicle travels according to the increase in the accelerator operation amount θ. As the degree V increases along the line L, the traveling degree V reaches the upper limit speed Vimt at a point e at which the accelerator operation amount θacc is maximized.

  Accordingly, as in the first and second embodiments, the operator can keep the traveling speed of the vehicle 1 at the upper limit speed Vimt while fully depressing the accelerator pedal 53, so that the fatigue due to the driving operation can be greatly reduced, By achieving the target watering amount Qtgt, cooling of the pavement material can be promoted.

Furthermore, since the traveling speed V of the vehicle 1 can be arbitrarily increased / decreased in proportion to the accelerator operation amount θacc on the line L (between the points d and e), there is an advantage that the compacting operation can be performed more easily.
On the other hand, the accelerator operation can be made unnecessary based on the first embodiment, and will be described as a fourth embodiment below.

[Fourth Embodiment]
In the present embodiment, a self-running (automatic running) switch 60 (self-running commanding means) is connected to the ECU 51 as an operating means instead of the accelerator operation. The self-propelled switch 60 is a switch for instructing the vehicle 1 to travel when the accelerator pedal 53 is not operated.

  In the state where the self-propelled switch 60 is turned off, the ECU 51 idles the engine 11 and the vehicle 1 is kept at the creep speed. When the self-propelled switch 60 is turned ON together with the watering switch 55, the ECU 51 controls the engine 11 so that the engine speed Ne corresponds to the target watering amount Qtgt even if the accelerator pedal 53 is not depressed. Then, the relief valve 44 is opened to limit the traveling speed V to the upper limit speed Vimt. As a result, the vehicle 1 starts accelerating and the traveling speed V is controlled to the point b in FIG. 3, and the water spray amount Q to the road surface is controlled to the point c in FIG. As a result, the vehicle 1 can be driven at a traveling speed V lower than the traveling speed V corresponding to the target watering amount Qtgt while achieving the target watering amount Qtgt. In this case, the operator can maintain the traveling speed of the vehicle 1 at the upper limit speed Vimt without depressing the accelerator pedal 53, so that the fatigue caused by the driving operation can be greatly reduced.

  This is the end of the description of the embodiment, but the aspect of the present invention is not limited to this embodiment. For example, in the above-described embodiment, the tire roller 1 is embodied. However, any work vehicle including an HST-driven travel device and a watering device as a work device can be arbitrarily changed, and the power source thereof is also the engine 11. It is not limited to. For example, it may be applied to a Macadam roller or a combined roller provided with an iron ring, or a motor may be used as a power source.

  Moreover, in the said embodiment, when the watering amount increase mode was selected by the watering mode selection switch 56, control of this invention was implemented, However, It is not restricted to this. For example, the watering mode selection switch 56 may be omitted, and the watering amount increase mode may always be performed when watering is performed in the compacting operation.

  Further, in the above-described embodiment, the pressure oil for adjusting the tilt angle of the traveling hydraulic pump 12 is discharged according to the opening of the relief valve 44, whereby the amount of oil discharged from the traveling hydraulic pump 12 and thus the traveling hydraulic pressure is increased. Although the amount of oil supplied to the motor 17 is limited, it is not limited to this. For example, when the hydraulic circuit including the traveling hydraulic pump 12 is configured as an open circuit, a part of the amount of oil discharged from the traveling hydraulic pump 12 is discharged to the oil tank 21 side by the flow control valve (oil amount limiting means). By doing so, the amount of oil supplied to the traveling hydraulic motor 17 may be limited.

  Moreover, in the said embodiment, although the relief valve 44 was operated based on the electrical command from ECU51, it does not restrict to this. For example, a countermeasure on the hydraulic circuit may be taken so that the relief valve 44 operates in conjunction with the traveling speed V of the vehicle 1, thereby opening the relief valve 44 at the upper limit speed Vlmt (running / watering) Control means).

1 Tire roller (vehicle)
12 Traveling hydraulic pump 13 Charging hydraulic pump 17 Traveling hydraulic motor 24 Watering hydraulic motor 44 Relief valve (oil amount limiting means)
51 ECU (travel speed detection means, travel / watering control means)
52 Wheel speed sensor (travel speed detection means)
54 Accelerator sensor (Accelerator operation amount detection means)
55 Watering switch (watering command means)
56 Sprinkling mode selection switch (sprinkling amount increase mode command means)
57 Sprinkling amount setting switch (rotation speed setting means)
58 Upper limit speed setting switch (Upper speed setting means)
60 Self-propelled switch (self-propelled command means)

Claims (8)

A traveling hydraulic motor that is driven by pressure oil from a traveling hydraulic pump driven by a power source to travel the vehicle;
A watering hydraulic motor that operates by pressure oil from a watering hydraulic pump driven by the power source and performs watering on the road surface;
Watering command means for commanding watering to the road surface;
Travel speed detecting means for detecting the travel speed of the vehicle;
Upper speed setting means for setting an upper speed limit of the vehicle;
Rotation speed setting means for setting the rotation speed of the power source;
An oil amount limiting means capable of arbitrarily limiting the amount of oil supplied from the traveling hydraulic pump to the traveling hydraulic motor;
When watering to the road surface is instructed by the watering instruction means, the power source is operated so as to have the rotational speed set by the rotational speed setting means, and the travel detected by the travel speed detection means A compacting machine comprising: a running / sprinkling control means for controlling the oil amount limiting means based on speed to limit the traveling speed of the vehicle to an upper limit speed set by the upper limit speed setting means. . Accelerator operation amount detection means for detecting the accelerator operation amount,
When the accelerator operation amount detected by the accelerator operation amount detection means reaches a predetermined value in a state where water spraying to the road surface is commanded by the water spray command means, the traveling / sprinkling control means controls the rotation speed of the power source. 2. The compacting machine according to claim 1, wherein the rotational speed is increased stepwise to the rotational speed set by the rotational speed setting means, and the traveling speed of the vehicle is limited to the upper limit speed. Accelerator operation amount detection means for detecting the accelerator operation amount,
The traveling / sprinkling control means increases the rotational speed of the power source according to the increase in the accelerator operation amount detected by the accelerator operation amount detection means, with the rotational speed set by the rotational speed setting means as an upper limit. When the traveling speed of the vehicle reaches the upper limit speed, the upper limit speed is limited, and when the rotational speed of the power source reaches the rotational speed set by the rotational speed setting means, the increase in rotation is suppressed. The compacting machine according to claim 1. Accelerator operation amount detection means for detecting the accelerator operation amount,
The traveling / sprinkling control means controls the rotation speed of the power source according to the increase in the accelerator operation amount detected by the accelerator operation amount detection means when watering to the road surface is instructed by the watering instruction means. And when the accelerator operation amount detecting means detects that the accelerator is fully opened, the rotational speed of the power source reaches the rotational speed set by the rotational speed setting means, and the traveling speed of the vehicle becomes the upper limit speed. 2. The compacting machine according to claim 1, wherein the rotational speed of the power source and the oil amount limiting means are controlled so as to reach the above. A self-running command means for commanding the vehicle to run when the accelerator pedal is not operated;
The running / sprinkling control means is configured to set the rotational speed even when the accelerator pedal is in a non-operating state when watering to the road surface is instructed by the watering instruction means and the self-propelling instruction means is operated. 2. The compacting machine according to claim 1, wherein the power source is operated so as to have a rotational speed set by the means. A sprinkling amount increase mode command means for commanding a sprinkling amount increase mode in which the sprinkling amount is increased with respect to the traveling speed of the vehicle;
The running / sprinkling control means is based on the set rotational speed when watering to the road surface is instructed by the watering instruction means and the watering amount increase mode is instructed by the watering amount increase mode instruction means. 6. The compacting machine according to claim 1, wherein the power source is operated and the travel speed is limited based on the upper limit speed. The rotation speed setting means has a rotation speed when the upper limit speed set by the upper limit speed setting means is achieved as a lower limit value, and prohibits setting of a rotation speed at least on a lower rotation side than the lower limit value. 7. The compacting machine according to claim 1, wherein the compacting machine is configured. The upper limit speed setting means is configured to prohibit setting of an upper limit speed corresponding to a rotation speed on the higher rotation side than at least the upper limit value with the rotation speed set by the rotation speed setting means as an upper limit value. The compacting machine according to any one of claims 1 to 7, characterized in that

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