JP2023002939A - Service vehicle - Google Patents

Abstract

To provide a service vehicle which uses a diesel particulate filter as an exhaust gas post processing device of a diesel engine mounted on the service vehicle, enables switches and lamps related to regeneration of the filter to be arranged in proper positions, and can reliably provide notifications to a worker based on the lamps while securing operability of the switches.SOLUTION: A sub panel cover 53 is provided close to a center of the upper side of a front part of a panel cover 40 to which a meter panel 42 and various kinds of operation switches are attached. Switches and lamps 51, 52 related to regeneration of a diesel particulate filter are attached to a rear surface of the sub panel cover to be in a front view field of a worker seated on a driver seat.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to working vehicles such as tractors and riding-type rice transplanters, mainly for agricultural use, and more particularly to working vehicles using a diesel particulate filter as an exhaust gas post-treatment device for a mounted diesel engine.

Diesel engines, which are installed in agricultural work vehicles and drive various parts of the aircraft, are mainly adopted because of their excellent combustion efficiency, good fuel efficiency, and strong power from low revolutions. However, the harmful particulate matter (PM) and nitrogen oxides (NOx) contained in the exhaust gas of diesel engines are regarded as a problem, and currently common rail fuel injection systems, exhaust gas recirculation systems (EGR), etc. Improvements in engine combustion technology and the adoption of exhaust gas aftertreatment devices such as diesel particulate filters (DPFs) and urea SCRs have addressed this problem.

By the way, the diesel particulate filter as the exhaust gas aftertreatment device described above collects particulate matter (mainly solid carbon particles: soot (SOOT)) in the exhaust gas and discharges it into the atmosphere. get rid of However, since the collected particulate matter clogs the filter when the accumulated amount increases, it is necessary to regenerate the filter by reburning it at a high temperature to remove it when it accumulates to a certain extent.

If the regeneration of this filter is properly performed automatically or based on a manual command according to the operating conditions of the work vehicle, the performance of the diesel particulate filter itself is unlikely to deteriorate. If the regeneration process is not carried out appropriately and in an appropriate amount, a large amount of accumulated soot will burn rapidly during the regeneration process, and there is a danger that the diesel particulate filter itself will be thermally destroyed, and expensive filter replacement work will also occur. Appropriate measures should be taken with this in mind.

Therefore, in order to obtain information regarding the regeneration of the diesel particulate filter while operating the work vehicle while sitting in the driver's seat, and to reliably issue a regeneration command in accordance with the request, for example, in a tractor, the steering wheel It is known to provide a DPF regeneration switch on the upper surface of the steering column at the base and place the DPF regeneration switch in the field of view of the operator when in a straight-ahead working posture (see Patent Document 1).

Further, in a wheel loader or a hydraulic excavator, regeneration means for regenerating a filter, regeneration start instruction means for instructing start of operation of the regeneration means, regeneration prohibition instruction means for instructing prohibition of operation of the regeneration means, and accumulation amount estimation means. When the estimated deposit amount exceeds a predetermined first threshold, an automatic regeneration control function that activates the regeneration means; and when the deposit amount estimated by the deposit amount estimation means exceeds a predetermined second threshold, operation of the regeneration start instruction means. a manual regeneration control function for outputting a warning signal prompting the regeneration start instruction means to operate the regeneration means, and a regeneration prohibition control function for prohibiting the operation of the regeneration means when the regeneration prohibition instruction means is operated. It is known to provide a reproduction control device or the like that has such a function (see Patent Literature 2).

At the front of the fuselage, which has front and rear wheels, is a bonnet with an internal engine. At the rear is a steering wheel and an instrument panel box with a fuel gauge, etc. on the panel surface. In a tractor equipped with a cab, the windshield wiper drive is covered by an auxiliary equipment operation box between the panel surface of the instrument panel box, which is inclined in the front-high and rear-low shape, and the windshield in front of it. The mechanism is disposed so as to fit within at least the lateral width of the instrument panel box, and the rotating drive shaft directed forward from the wiper drive mechanism is protruded outside the vehicle through the front windshield, thereby extending the windshield. is known to drive a wiper (see Patent Document 3).

Japanese Patent Application Laid-Open No. 2016-78600 JP 2011-37334 A Japanese Patent No. 3657249

As mentioned above, when a diesel particulate filter is installed as an exhaust gas post-treatment device in a diesel engine mounted on a work vehicle such as a tractor, harmful particulate matter in the exhaust gas is collected by the filter and released into the atmosphere as it is. can be prevented from being discharged. However, if the engine is operated for a long time, a large amount of particulate matter accumulates on the filter depending on the work contents and work environment during that time, and if left as it is, there is a risk of clogging the filter.

Therefore, in order to prevent this, the electronic control unit of the engine estimates the amount of soot deposited in the filter, for example, and if this soot deposits at a predetermined rate or more, it does not limit the engine output (interferes with normal operation). without) and auto-regenerates to burn off the soot. If soot combustion does not progress even after this automatic regeneration and the percentage of soot deposits further increases, a manual regeneration request is issued by means of a lamp, buzzer, or the like.

When the operator receives the notification of the manual regeneration request from the electronic control unit of the engine, moves the work vehicle to a place where there is no risk of fire or the like, parks the work vehicle, and then issues the command with the manual regeneration switch. The electronic control unit of the engine restricts the rotation of the engine and reburns it at a high temperature to burn and remove the soot deposited on the filter. In addition, if the above-mentioned automatic regeneration is performed indoors with poor ventilation or in a place close to combustibles (shade of trees, vinyl houses, etc.), there is a risk of fire, etc. In such cases, automatic regeneration is prohibited. Provide a switch for issuing a command to switch and a lamp for indicating its status.

Therefore, the notification from the electronic control unit of the engine regarding the regeneration of the diesel particulate filter is promptly transmitted to the operator considering the possibility of filter clogging or breakage, and the operator's manual regeneration or automatic regeneration prohibition. Orders, etc. must be carried out appropriately. However, when a worker sits in the driver's seat and drives the work vehicle, the worker can handle the steering wheel while looking through the hood covering the engine at the road surface, field, or ridges and obstacles on the road ahead. Therefore, if the DPF regeneration switch is positioned below the steering handle as in the above-mentioned Patent Document 1, even if the regeneration switch can be operated, there is a risk that the request for manual regeneration from the engine will be overlooked. There is

In addition, the DPF regeneration switch provided on the top of the steering column is close to the driver's seat, and it is possible that an inexperienced operator may carelessly operate the DPF regeneration switch or accidentally touch it. It is not possible to see the advantage of installing it at a cost. In addition, there is an empty space above the front part of the dashboard on which the operation display panel is provided in front of the steering wheel. In addition, Patent Document 3 suggests that an auxiliary equipment operation box is provided in the space concerned so that the auxiliary equipment can be operated safely and easily without looking away from the forward and downward line of sight even while the aircraft is moving. there is

Therefore, in view of the problem of the arrangement of the DPF regeneration switch described in Patent Document 1, the present invention is based on the suggestion of effective use of the empty space described in Patent Document 3. When a diesel particulate filter is used as an exhaust gas post-treatment device for an engine, a switch and a lamp related to the regeneration of the filter are arranged in an optimal place, and notification is given to the worker based on the lamp while securing the operability of this switch. An object of the present invention is to provide a work vehicle capable of reliably performing

In order to solve the above problems, the present invention provides a work vehicle in which a steering handle, a meter panel, and a panel cover for mounting various operation switches are provided in front of the driver's seat, and a diesel engine is provided in front of these with a bonnet. The diesel engine has an exhaust gas purifying device that collects particulate matter in the exhaust gas with a diesel particulate filter and burns and removes the collected particulate matter to regenerate the filter. On the other hand, switches and lamps related to regeneration of this filter are provided on the rear surface of the sub-panel cover provided near the center of the upper front part of the panel cover, so that the switches and lamps provided on the meter panel of the panel cover and the sub-panel cover It is characterized by being within the forward field of vision of the operator sitting in the driver's seat.

Further, the present invention is characterized in that a DPF regeneration lamp and an engine failure lamp are provided on the meter panel provided on the panel cover, and a manual regeneration switch, a regeneration prohibition switch, and lamps for each switch are provided on the rear surface of the sub-panel cover. do.

Further, according to the present invention, an accommodating portion for a mobile terminal is formed near the center of the rear surface of the sub-panel cover, and a manual regeneration switch and a regeneration prohibition switch with lamps are provided on the left and right sides of the rear surface of the sub-panel cover, as well as a mobile terminal charging switch. It is characterized by distributing power sockets.

Then, the present invention acquires the information of the engine and the regeneration information of the filter, and drives the electronic control unit that controls the lighting of the lamp provided on the meter panel of the panel cover and the sub-panel cover, or the wiper provided on the windshield of the cabin. The electronic control unit and the electric motor are provided below the sub-panel cover and covered by the sub-panel cover.

According to the work vehicle of the present invention, a work vehicle provided with a panel cover for mounting a steering handle, a meter panel, and various operation switches in front of the driver's seat, and a diesel engine covered with a bonnet in front of these, A diesel engine is equipped with an exhaust gas purifying device that collects particulate matter in its exhaust gas with a diesel particulate filter and burns and removes the collected particulate matter to regenerate the filter, The switches and lamps related to regeneration of this filter are provided on the rear surface of the sub-panel cover provided near the center of the upper front portion of the panel cover, so that the switches and lamps provided on the meter panel of the panel cover and the sub-panel cover are located in the driver's seat. Make sure it is within the front sight of the seated worker.

Therefore, when the worker sits in the driver's seat and is driving the work vehicle, the worker can handle the steering wheel while looking through the hood that covers the engine to the road surface, farm field, ridges, obstacles on the road, etc. In this case, the switches and lamps provided on the meter panel of the panel cover and the sub-panel cover are within the front view of the operator, so the warning regarding regeneration of the diesel particulate filter can be quickly obtained without overlooking it. and take appropriate action.

In addition, since the switch for regeneration of the filter is provided on the rear surface of the sub-panel cover slightly forward from the steering handle, it may be accidentally touched by an inexperienced operator while gripping the steering handle. On the other hand, when operating the switch, standing up from the driver's seat and reaching forward will reach the switch. , then you can get off and wait for the playback to complete.

Moreover, when replacing with a new engine equipped with a diesel particulate filter, the work vehicle will have to newly install switches related to regeneration in the control section, etc. If it is attempted to be attached, there is a possibility that the processing cost will increase, resulting in an increase in cost. In addition, extra places for mounting new switches and lamps are usually not secured on the meter panel and the panel cover on which various operation switches are mounted.

However, the upper part of the panel cover is originally an empty space, and the rear part of the panel cover is the visor of the meter panel, which is a slightly higher position, but the front part slopes down and becomes lower than that. Therefore, even if the sub-panel cover is provided near the center of the upper front portion, there is no possibility that the sub-panel cover will block the forward field of vision and deteriorate it. , these switches and lamps are recognized as separate entities from the switches and the like provided on the panel cover, so that the degree of alerting in the alarm can be enhanced.

Further, according to the work vehicle of the present invention, a DPF regeneration lamp and an engine failure lamp are provided on the meter panel provided on the panel cover, and a manual regeneration switch, a regeneration prohibition switch, and lamps for each switch are provided on the rear surface of the sub-panel cover. prepare. Therefore, detailed information regarding filter regeneration can be accurately reported using DPF regeneration lamps, engine failure lamps, manual regeneration switch and regeneration inhibit switch lamps within the operator's forward field of vision.

More specifically, for example, when a request for manual regeneration of the filter is issued, the DPF regeneration lamp provided on the meter panel and the lamp of the manual regeneration switch provided on the rear surface of the sub-panel cover are blinked at the same time, and the manual regeneration command is immediately issued. Also, when automatic regeneration or manual regeneration is performed, the lamp of the DPF regeneration lamp or manual regeneration switch is turned on to notify, or when an excessive accumulation request is issued, the DPF regeneration lamp blinks. However, the lamp of the manual regeneration switch can be extinguished, and the engine failure lamp can be illuminated to indicate that manual regeneration is impossible.

Furthermore, according to the work vehicle of the present invention, a mobile terminal accommodating portion is formed near the center of the rear surface of the sub-panel cover, and a manual regeneration switch and a regeneration prohibition switch with lamps are provided near the left and right sides of the rear surface of the sub-panel cover. Separate power sockets for charging mobile devices.

For this reason, the sub-panel cover, which is equipped with switches and lamps related to playback, can be effectively used as a place to store smartphones and mobile phones. Since it comes into the forward field of vision of the worker together with the lamp, it is possible to prevent the operator from overlooking incoming calls or e-mails. In addition, by connecting a mobile terminal to a power socket via a charger or the like, the mobile terminal can be charged during work, and convenience can be improved.

According to the work vehicle of the present invention, an electronic control unit that acquires the information of the engine and the regeneration information of the filter and controls lighting of the lamp provided on the meter panel of the panel cover and the sub-panel cover, or the windshield of the cabin The electric motor for driving the wiper provided in the sub-panel cover, or the electronic control unit and the electric motor are provided below the sub-panel cover and covered by the sub-panel cover.

Therefore, even if a lamp for regeneration of the diesel particulate filter is newly provided and an electronic control unit for controlling the lighting of this lamp is required, this electronic control unit is provided under the sub-panel cover near the lamp and engine. , the electronic control unit can be covered by the sub-panel cover itself without preparing a separate cover, without exposing it to the weather.

In addition, in a work vehicle having a cabin that covers a control section, an electric motor that drives a wiper provided on the windshield of the cabin is provided below the panel cover, and the electric motor is covered by the panel cover so that the front portion of the panel cover is positioned near the front portion of the panel cover. Inflate it and prepare it as a separate part from the panel cover of the specification without a cabin. However, if the electric motor is provided below the sub-panel cover and covered with the sub-panel cover, there is no need to bulge the front part of the panel cover. Management costs can be reduced.

1 is a side view of a tractor; FIG. FIG. 3 is a side view of a driving unit and a control unit; FIG. 3 is a perspective view of a control section; It is a front view of the control part seen from the driver's seat side. FIG. 4 is a side view of an operating section mainly including a sub-panel cover; It is a cross-sectional view of the same upper side. It is the perspective view seen from the diagonally rear side explaining attachment of a sub-panel cover. It is the perspective view seen from the slanting front side explaining attachment of a subpanel cover. A sub-panel cover is shown, (a) is a perspective view, (b) is a plan view, (c) is a front view, and (d) is a side view. FIG. 11 is a perspective view of a switch for filter regeneration; FIG. 4 is an explanatory diagram of a switch label and a connector; It is a side view which shows the attachment state of the wiper motor provided in a cabin. FIG. 4 is an explanatory diagram of the essential parts of a tachometer and a lamp provided on the meter panel;

An embodiment of the present invention will be described based on the drawings. As shown in FIGS. 1 to 5, an agricultural tractor 1 as a working vehicle comprises an engine 2 and front and rear transmission cases 3 and 4 integrally connected to form a vehicle body (body). A front axle case (not shown) is rotatably supported on the underside of chassis brackets 5 fixed to the left and right near the lower portion of the engine 2 and extending forward. Front axle cases are attached to the left and right ends of the front axle case, respectively.

On the other hand, the rear axle cases fixed on the left and right sides of the rear transmission case 4 support the rear axles 8 respectively, and the left and right rear wheels 9 are attached to the respective rear axles 8 . A well-known three-point link mechanism comprising a top link 10 and left and right lower links 11 is provided at the rear portion of the vehicle body. This three-point link mechanism connects a work machine such as a rotary tillage device. A lift rod having one end connected to the tip of the lift arm and the middle of the lower link 11 is provided so as to be vertically movable.

Furthermore, the above-mentioned engine 2 employs a diesel engine, and this engine 2 is designed to reduce the generation of particulate matter such as nitrogen oxides generated by complete combustion and soot generated by incomplete combustion in accordance with stricter exhaust gas regulations. A common rail fuel injection system, a turbocharger, and an exhaust gas recirculation system (EGR), etc., are used to reduce the amount of nitrogen oxides and particulate matter that have not been purified by the engine itself, and the exhaust gas aftertreatment device is used. It is removed using a diesel oxidation catalyst (DOC) and a diesel particulate filter (diesel particulate filter: DPF).

Therefore, the diesel engine 2 is provided with a DPF case 12 containing a DOC and a DPF attached to the upper part of the main body near the rear. Accordingly, the gas discharged from the engine 2 is introduced into the DPF case 12 and then discharged to the outside of the machine through a tail pipe (not shown) provided on the outlet side of the DPF case 12 . An accessory bracket 13 consisting of a bottom plate and a stay is attached to the upper surface of the chassis bracket 5. A radiator 14 for cooling cooling water of the engine 2 is attached to the accessory bracket 13, and clean air is supplied to the engine 2. An air cleaner 15, an oil cooler 16, an intercooler 17, a battery 18 and the like are provided.

The engine 2 and accessories are covered by a bonnet 19 having an air vent 19a and a headlamp 20 on the front. It is installed through the front part and is provided so that it can be opened and closed freely. The outer circumference of the cover bracket 21 is covered with an inverted U-shaped rear cover 22, and left and right side covers 23 are provided under the rear cover 22 so as to be detachable from the accessory bracket 134 using bolts with knobs.

Further, a control section is provided behind the rear cover 22, and this control section is supported by the transmission cases 3 and 4 in a vibration-proof manner, and has a floor frame 25 in which the driver's seat 24 is provided in the center of the rear side. It consists of left and right fenders 26 covering the upper part, a safety frame 27 provided behind the driver's seat 24, and the like. In the front part of the floor frame 25, an inverted U-shaped handle frame 28 facing the rear cover 22 on the engine side is erected. A steering handle 29 for steering the left and right front wheels 7 by a full hydraulic power steering unit is provided so that the tilt can be freely adjusted.

A combination switch 30, a quick-up lever 31 for raising and lowering the working machine, an engine control lever 32, and a forward/reverse lever 33 are provided below the steering handle 29. A steering shaft 34 and a steering column 35 are provided as a whole. It is covered by a cover 36. Further, the column mounting bracket 28a is provided with a main clutch pedal 37 on the left side as viewed from the driver's seat 24, and left and right brake pedals 38 on the right side, respectively, and a parking brake lever 39 near the center. prepare.

The column mounting bracket 28a in front of the steering handle 29 is provided with a cover to cover itself, and this cover is composed of a panel cover 40 provided near the top and a rear panel cover 41 covering the rear surface near the bottom. Among them, a meter panel 42 having a glass 42b on the front of a case 42a is attached to an opening 40a provided on the rear surface near the upper center of the panel cover 40, and an operator sits on the driver's seat 24 and looks forward. At that time, the meter panel 42 can be visually recognized from between the rim and the hub of the steering handle 29, and at that time, the board surface of the meter panel 42 is attached to the panel cover 40 so as to be substantially perpendicular to the forward line of sight of the operator. Provided at an angle (see FIGS. 6 and 7).

The periphery of the opening 40a of the panel cover 40 to which the meter panel 42 is attached is formed in a visor (sunshade) 40b that rises rearward. ing. Further, on the left and right of the opening 40c in which the cover 36 of the steering handle 29 is fitted behind the opening 40a for mounting the meter panel 42, there are switches for turning on and off various automatic controls (double speed, backup, turn-up, etc.) and their on/off states. and a right front unit 45 including operation switches for setting the display screen of the liquid crystal display 44 provided in the meter panel 42, and the like.

Further, a hazard lamp switch 46 and a horn switch 47 are provided on the panel cover 40 on the upper side and the lower side of the left front unit 43, and a starter switch 48 is provided on the panel cover 40 on the lower side of the right front unit 45. In addition to the switches and operation levers described above, the tractor 1 can be operated on panels provided on the left and right sides of the driver's seat 24 and on the floor surface of the floor frame 25. Operation tools such as position levers, various switches, and volume controls are distributed in appropriate locations.

The outline of the tractor 1 has been described above. Next, regeneration of the diesel particulate filter provided in the diesel engine 2 and attachment of switches and lamps related to regeneration will be described. First, the diesel particulate filter collects soot (SOOT) contained in the exhaust gas of the diesel engine 2 as described above. In addition, an electronic control unit (electronic control unit: ECU) that controls the diesel engine 2 measures the amount of soot deposited on the diesel particulate filter (accumulation amount ratio) based on an exhaust temperature sensor, an exhaust pressure differential pressure sensor, etc. presume.

Then, the ECU of the engine 2 treats the engine 2 as normal operation when the soot accumulation amount ratio (percentage) is, for example, 0 to less than 80, and issues an automatic regeneration request when it is 80 or more. Here, if an automatic regeneration request is issued and the engine speed is high and the cooling water temperature is high, the common rail fuel injection system mixes unburned fuel into the exhaust pipe by post-injection, and this unburned fuel is transferred to the diesel engine. The oxidation catalyst causes oxidative combustion to raise the temperature of the exhaust gas passing through the diesel particulate filter so that the soot deposited on the diesel particulate filter can be reburned and removed from the filter.

In addition, the ECU of the engine 2 issues a manual regeneration request if the soot accumulation amount ratio is 100 or more regardless of the automatic regeneration described above. No limit control is performed, but in the latter period when the engine speed is less than 120 to 140, the engine output is reduced to 50% and the maximum speed is limited to 1500 rpm. Then, when manual regeneration is commanded by the operator, the injection amount of main injection and post injection is increased compared to automatic regeneration, and the exhaust gas temperature is further raised to accelerate the regeneration speed of the diesel particulate filter.

Furthermore, the ECU of the engine 2 issues an excessive deposition request when the soot deposition rate is 140 or more, and in this case, if it is 140 to less than 160, the engine output limit control is performed in the first stage. , the engine output is 50% and the rotation limit is set to 1500 rpm, and in the second stage after 7200 seconds, the rotation limit is set to 1200 rpm. Also, in the latter stage of 160 or more, the first stage similarly sets the engine output to 50% and sets the rotation limit to 1500 rpm, and the second stage after 3600 seconds sets the rotation limit to 1200 rpm.

When the ECU of the engine 2 regenerates the diesel particulate filter, the temperature of the exhaust gas, tail pipe, etc. becomes high, and the automatic regeneration described above cannot be performed indoors with poor ventilation or in places close to combustibles (shade of trees, vinyl houses, etc.). Since there is a risk of fire, gas poisoning, etc., in such a case, the operator can issue a command to prohibit automatic regeneration. When instructing manual regeneration, move the tractor 1 to a safe, wide area with good ventilation and no flammable materials around it. Otherwise, manual regeneration cannot be performed.

Furthermore, if the above-mentioned excessive accumulation request is issued without being able to properly perform automatic regeneration or manual regeneration of the diesel particulate filter, it will be impossible for the operator to regenerate the diesel particulate filter, so the work should be done quickly. Then, the engine will be stopped and a serviceman or the like will attempt to regenerate the engine using a service tool or the like, or in the worst case, the diesel particulate filter will be repaired or replaced.

Regarding regeneration of the diesel particulate filter, the tractor 1 has a DPF regeneration lamp 49 for notifying the DPF status (request/regeneration/abnormality) on the meter panel 42 of the panel cover 40 as shown in FIG. An engine fault lamp 50 is provided. In addition, a manual regeneration switch for commanding manual regeneration, a regeneration prohibition switch for commanding regeneration prohibition, a manual regeneration lamp for notifying the request and execution of manual regeneration, and a regeneration prohibition lamp for notifying execution of regeneration prohibition are provided.

In addition, the manual regeneration switch and manual regeneration lamp, and the regeneration prohibition switch and regeneration prohibition lamp described above each use a push button switch with an LED ball that integrates the lamp and the switch, and these two manual regeneration switches (with lamps) ) 51 and a regeneration inhibition switch (with a lamp) 52 are attached to the rear surface 53a of a sub-panel cover 53 made of synthetic resin. The sub-panel cover 53 is attached near the center of the upper front portion of the panel cover 40, so that the switches and lamps provided on the meter panel 42 of the panel cover 40 and the sub-panel cover 53 can be operated while sitting in the driver's seat 24. be within the front sight of the person.

More specifically, as shown in FIGS. 6 to 10, an opening 40d is provided near the center of the upper front portion of the panel cover 40, and the front mounting seat 28b fixed to the handle frame 28 is raised upward through this opening 40d. Further, a rear mounting seat 28c is attached to the edge of the opening 40d near the rear to be raised upward, and a cushion material 54 for preventing water and dust from entering the panel cover 40 is attached to the edge near the rear of the opening 40d. paste. On the other hand, the sub-panel cover 53, which is formed like a lid so as to accommodate the switch, has four ribs 53b on its inner surface, front, back, left, and right. The lower end is fixed with a clip 56, and the lateral deformation of the side wall 53c of the sub-panel cover 53 is prevented by a reinforcing metal fitting 55.例文帳に追加

Then, the sub-panel cover 53 to which the reinforcing metal fittings 55 are attached is placed from above so as to cover the opening 40d of the panel cover 40, and the sub-panel cover 53 and the reinforcing metal fittings 55 are fixed to the front mounting seat 28b and the rear mounting seat 28c with screws 57. do. Therefore, the sub-panel cover 53 covers the central upper surface of the upper front part of the panel cover 40 without any gap, and both covers 40 and 53 are individually molded from synthetic resin, but both are attached to the handle frame 28. , it has an appearance that can be regarded as a single integrated cover.

The sub-panel cover 53 covers and covers the opening 40d of the panel cover 40, and its front portion is curved so as to cover the upper portion of the handle frame 28 formed in an inverted U shape. This is because the large diesel engine 2 equipped with a diesel particulate filter is provided in the front part of the vehicle body, so the height of the bonnet 19 and the rear cover 22 is increased, and a gap is generated between the upper part of the handle frame 28 and the bonnet 19. step is created. Therefore, the front portion 53d of the sub-panel cover 53 extending forward covers this gap, thereby eliminating the step at the boundary between the bonnet 19 and the control section, thereby improving the appearance.

Further, the rear surface 53a of the sub-panel cover 53 to which the manual regeneration switch 51 and the regeneration prohibition switch 52 are attached is slightly inclined so that the upper portion thereof is located forward from the lower portion thereof. The angle is the same as in the case where the board surface of is made substantially perpendicular to the front line of sight of the operator. A mobile terminal accommodating portion 53g having left and right side walls 53e and a rear wall 53f is integrally formed near the center of the rear surface 53a of the sub-panel cover 53, so that the sub-panel cover 53 can be used effectively.

That is, when traveling for work on the tractor 1, if a smart phone, a mobile phone, or the like is left in a pocket or the like, it may become an obstacle. In addition, it is convenient if there is a place for these items when displaying the moving route to the field or displaying the work travel locus. Therefore, a housing portion 53g is formed in the sub-panel cover 53 to be newly installed so that these items can be placed. In this state, the three packing rubbers 58 provided on the rear surface 53a of the sub-panel cover 53, the rear wall 53f of the housing portion 53g, and the left and right side walls 53e can be closed to hold the sub-panel cover 53.

Therefore, regardless of the body vibration of the tractor 1 or the tilt of the body, it is possible to prevent the smartphone from jumping out and eliminate damage due to an unexpected drop. In addition, when a smartphone is accommodated in the accommodation portion 53g, the screen is orthogonal to the front line of sight of the operator and is easy to see in the same way as the meter panel 42. Further, the screen can be clearly seen in the central portion 53h of the rear wall 53f of the accommodation portion 53g. Since it is recessed as shown in FIG.

A power socket (cigar socket) 59 is provided on the rear surface 53a on the right side of the accommodation portion 53g of the sub-panel cover 53, and a recess 53i through which cables are passed is formed near the front upper portion of the right side wall 53e of the accommodation portion 53g. are doing. Therefore, for example, when the cable of the charger whose plug is inserted into the power socket 59 is inserted into the charging terminal of the smartphone, the cable is passed through the recess 53i, and the smartphone is placed in the housing portion 53g, the smartphone is connected to the cable and the housing portion 53g. There is no fear that the battery may be unstably lifted up due to interference with the right side wall 53e of the battery and cannot be accommodated.

On the other hand, an anti-theft switch 60 is provided on the right rear surface of the power socket 59 provided on the right side of the sub-panel cover 53, and this anti-theft device senses the shaking of the tractor 1 and notifies it with a buzzer. As shown in FIG. 11, the manual regeneration switch 51 and the regeneration prohibition switch 52 arranged side by side on the rear surface 53a on the left side of the sub-panel cover 53 can be easily determined which switch is the manual regeneration switch 51 and which is the regeneration prohibition switch 52. As can be seen, the color of the switch label 61 with the name and mark attached to the sub-panel cover 53 is, for example, white (manual regeneration), white (manual regeneration), since white has an image of affirmation or beginning, and black has an image of negativity or rejection. A reversed color such as black (playback prohibited) is used to facilitate its identification.

In addition, the colors of the connectors of the wires of the manual regeneration switch 51 and the regeneration prohibition switch 52 to the ECU of the engine 2 are unified with the color of the switch label 61 described above. By making 63 black, erroneous connection can be eliminated and troubles can be prevented. The lamps of the manual regeneration switch 51 and the regeneration inhibiting switch 52 use yellow or orange as their warning colors, and by using these colors, prompt action is required in the event of an alarm.

As described above, the manual regeneration switch 51 provided on the sub-panel cover 53 allows the soot accumulation amount ratio of the filter to be set between 0 and In normal operation below 80, and in automatic regeneration with an auto-regeneration request of 80 or more, the lamp remains extinguished. The DPF regeneration lamp 49 on the meter panel 42 is extinguished when the automatic regeneration is not performed, and continuously lit when the automatic regeneration is performed.

Also, when a manual regeneration request is issued when the deposit ratio is 100 or more, if it is the previous period, the manual regeneration switch 51 lamp and the DPF regeneration lamp 49 are turned ON for 0.5 seconds and OFF for 0.5 seconds. blink. Furthermore, if it is the latter period, the cycle is shortened to ON: 0.3 seconds, OFF: 0.3 seconds, and blinked. In this case, the DPF regeneration request buzzer provided separately on the aircraft emits two single sounds only once per minute in the first half, and intermittently ON: 0.3 seconds and OFF: 0.3 seconds in the second half. audible alarm. Then, when the manual regeneration switch 51 is turned on and manual regeneration is performed, both the lamp of the manual regeneration switch 51 and the DPF regeneration lamp 49 are lit all the time.

Then, when the deposit amount ratio is 140 or more and an excessive deposit request is issued, the lamp of the manual regeneration switch 51 is extinguished regardless of whether it is in the early or late period, to notify that manual regeneration is no longer possible. . However, in this case, the DPF regeneration request buzzer and the DPF regeneration lamp 49 continue to warn with an intermittent sound and flashing with a shortened period of ON: 0.3 seconds, OFF: 0.3 seconds, and are provided on the meter panel 42 The engine failure lamp 50 is kept lit to prompt the worker to stop the work immediately.

If the DPF reaches an abnormally high temperature during regeneration, the DPF regeneration lamp 49 blinks at high speed, ON: 0.15 seconds, OFF: 0.15 seconds, and the engine failure lamp 50 is also lit constantly to to be notified. On the other hand, when the regeneration prohibiting switch 52 provided on the sub-panel cover 53 is turned off, the lamp is extinguished, and when the switch is turned on, the lamp is always lit. When the switch is turned on, a command is issued to the ECU of the engine 2 not to regenerate the diesel particulate filter, so automatic regeneration is not performed in this case.

Then, the lamps of the manual regeneration switch 51 and the regeneration prohibition switch 52 provided on the sub-panel cover 53, the DPF regeneration lamp 49 and the engine failure lamp 50 provided on the meter panel 42 of the panel cover 40, or the DPF regeneration lamp provided on the aircraft body. The complicated and precise drive control of the request buzzer as described above must be properly carried out with consideration given to conveying the content of the alarm to the operator in an easy-to-understand manner.

However, the information regarding the regeneration of the filter output from the ECU of the engine 2 is often only the minimum necessary information, and it is not possible to properly drive the lamp etc. based on the signal obtained as it is. , lamps, etc., an electronic control unit 64 for converting information from the engine ECU may be interposed. Therefore, the tractor 1 is provided with an electronic control unit 64 for filter regeneration notification that drives and controls lamps and the like with a unified notification pattern following the filter regeneration alarms of other work vehicles such as combine harvesters. is attached to the column mounting bracket 28a and covered with a sub-panel cover 53 (see FIG. 6).

12, when the control section of the tractor 1 is covered with a cabin, an electric motor (wiper motor) 67 for driving a wiper 66 provided on the windshield 65 of the cabin is provided below the panel cover 40. In this case, the front side of the panel cover 40 is expanded to cover the electric motor 67, and a separate part is prepared and covered from the non-expanded panel cover 40 of the specification without a cabin.

However, even if the electric motor 67 is attached to the column mounting bracket 28a in the conventional manner, the electric motor 67 is positioned below the sub-panel cover 53 and can be covered by the sub-panel cover 53 as it is. The panel cover 40 with a bulging front portion is no longer necessary, and by eliminating this part, it is possible to reduce the cost of parts management.

When manually regenerating the filter as described above, move the tractor 1 to a safe, wide area with good ventilation and no flammable materials around it. Manual regeneration cannot be performed by the ECU of the engine 2 unless the engine 2 is in the idling state.

However, when the ECU of the engine 2 issues a manual regeneration request as shown in FIG. When 68 is blinked, the blinking of the parking lamp 68 makes it clear that the parking brake lever 39 must be operated to apply the parking brake when issuing a command for manual regeneration. It is possible to prevent it and smoothly shift to manual regeneration.

Even if the tractor 1 is stopped and the parking brake is not applied when the manual regeneration switch 51 is turned on, the electronic control unit on the tractor 1 side pressurizes oil to the hydraulic brake cylinder (not shown). is supplied to automatically apply the brakes to the wheels 6 and 9 of the tractor 1, the tractor 1 can be substantially kept in a parked state even if the operation of the parking brake is forgotten. By doing so, it is possible to shift to manual regeneration quickly.

Further, when the ECU of the engine 2 is manually regenerating the filter, the engine control lever 32 or the foot control pedal for commanding the rotation speed of the engine 2 is operated so that the engine rotation is higher than the idling rotation. When the number is commanded, the ECU interrupts manual regeneration of the filter as work begins. However, if this rotation speed command is generated by an operator's erroneous operation or an unexpected contact with the engine control lever 32 or the like when getting on or off the tractor 1, the regeneration will be interrupted and the regeneration time will be extended. Therefore, it is desirable to avoid such interruption of playback as much as possible.

Therefore, once the manual regeneration command is issued, the electronic control unit of the tractor 1 monitors the engine speed command value from the engine control lever 32 or the foot control pedal. However, when the engine speed immediately returns to the idling speed, it is judged as an erroneous operation and the idling speed continues to be applied to the ECU of the engine 2, thereby avoiding interruption of filter regeneration. In addition, even if the electronic control unit of the tractor 1 continues to give the idling rotation speed as the engine rotation speed until the regeneration is completed when a manual regeneration command is issued, the interruption of the filter regeneration can be similarly avoided. can be done.

Furthermore, when the ECU of the engine 2 starts manual regeneration of the filter, since it is not known when the regeneration of the filter will be completed, it is difficult to make a plan for resuming work, which causes stress to the operator. Therefore, when manual regeneration of the filter is started, as shown in FIG. 13, a tachometer 69 provided on the meter panel 42 is used to display the remaining regeneration time. Therefore, by displaying, for example, 10 minutes remaining per 1000 rpm on the tachometer, it is possible to eliminate the need to provide a dedicated display device for displaying the waiting time.

Further, by pressing the manual regeneration switch 51 for a long time after the ECU of the engine 2 starts manual regeneration of the filter, the tachometer 69 provided on the meter panel 42 described above displays the waiting time until the regeneration of the filter is completed. It may also be possible to switch between the mode and the mode in which the original engine 2 speed is displayed, so that the control state of the engine speed during manual regeneration of the filter becomes clear. In the above-described embodiment, the sub-panel cover 53 is formed with the housing portion 53g for the mobile terminal. It is not limited.

1 tractor (work vehicle)
2 diesel engine 7 front wheel 9 rear wheel 12 DPF case (diesel particulate filter)
19 Bonnet 24 Driver's Seat 29 Steering Handle 40 Panel Cover 42 Meter Panel 49 DPF Regeneration Lamp 50 Engine Failure Lamp 51 Manual Regeneration Switch 52 Regeneration Inhibit Switch 53 Sub Panel Cover

Claims (4)

A working vehicle in which a steering handle, a meter panel, and a panel cover for mounting various operation switches are provided in front of the driver's seat, and a diesel engine is provided in front of these with a bonnet. It is equipped with an exhaust gas purifying device that collects particulate matter with a diesel particulate filter and burns and removes the collected particulate matter to regenerate the filter. , provided on the rear surface of the sub-panel cover provided near the center of the upper front part of the panel cover, so that the meter panel of the panel cover and the switches and lamps provided on the sub-panel cover are within the front view of the operator sitting in the driver's seat. A working vehicle characterized by being made to enter. 2. A meter panel provided on the panel cover is provided with a DPF regeneration lamp and an engine failure lamp, and a manual regeneration switch, a regeneration prohibition switch, and lamps for each switch are provided on the rear surface of the sub-panel cover. work vehicle. A mobile terminal accommodating portion is formed near the center of the rear surface of the sub-panel cover, and a manual regeneration switch with a lamp, a regeneration prohibition switch, and a power socket for charging the mobile terminal are separately provided on the left and right sides of the rear surface of the sub-panel cover. The work vehicle according to claim 2, characterized in that: An electronic control unit that acquires the information of the engine and the regeneration information of the filter and controls the lighting of the lamps provided on the meter panel of the panel cover and the sub-panel cover, or the electric motor that drives the wiper provided on the windshield of the cabin, or these 4. The work vehicle according to claim 3, wherein the electronic control unit and the electric motor are provided below the sub-panel cover and are covered by the sub-panel cover.

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