JP5388743B2 - Display device for work equipment - Google Patents

Description

  The present invention relates to a display device for a work machine, and in particular, is equipped with an exhaust gas purification system that incinerates and removes particulate matter deposited on a filter for collecting particulate matter contained in exhaust gas and regenerates the filter. The present invention relates to a display device disposed in a cab of a working machine such as a hydraulic excavator.

  Work machines such as wheel loaders and hydraulic excavators are equipped with a diesel engine as a drive source, but the amount of particulate matter (PM: particulate matter: hereinafter referred to as PM) discharged from this diesel engine is Regulations have been strengthened year by year together with NOx, CO, HC, etc. An exhaust gas purification system that collects PM with a filter called a diesel particulate filter (DPF: Diesel Particulate Filter) and reduces the amount of PM discharged to the outside is known for such regulations. . In this exhaust gas purification system, if the amount of PM captured in the filter increases, the filter will become clogged, which will increase the exhaust pressure of the engine and cause deterioration in fuel consumption. The collected PM is combusted as appropriate to remove the clogging of the filter, and the filter is regenerated.

  The regeneration of the filter is usually performed by using an oxidation catalyst. The oxidation catalyst may be disposed upstream of the filter, directly supported by the filter, or both. In either case, in order to activate the oxidation catalyst, the temperature of the exhaust gas Therefore, there is a technique called forced regeneration in which the exhaust gas temperature is forcibly raised to a temperature higher than the activation temperature of the oxidation catalyst. In this forced regeneration, a method of raising the temperature of exhaust gas by performing sub-injection (post-injection) for injecting fuel in the expansion stroke after in-cylinder main injection of the engine, exhaust by a fuel injection device for regeneration provided in the exhaust pipe There is a technique for injecting fuel into exhaust gas flowing through a pipe to raise the temperature of the exhaust gas.

  Further, the PM accumulation amount (collection amount) of the filter is estimated as a condition for starting these forced regenerations, and regeneration is performed when the PM accumulation amount reaches a preset threshold value. In that case, the pressure loss (differential pressure before and after the filter) of the filter is generally detected, and the PM deposition amount is generally calculated based on the detected value of the pressure loss. The forced regeneration of the filter includes automatic regeneration that automatically starts regeneration and manual regeneration that starts regeneration by an operator's operation input.

  In the automatic regeneration, the exhaust gas purification system inputs the PM accumulation amount, and outputs a command signal for starting regeneration when it is determined that the PM accumulation amount has exceeded a predetermined first threshold value. As a result, the exhaust gas purification system automatically starts regeneration, and stops regeneration when it is determined that a predetermined time has elapsed or the PM accumulation amount has become a predetermined value or less due to incineration removal.

  However, the exhaust gas temperature does not become higher than the activation temperature in cold districts, the engine stops in the middle of automatic regeneration, or PM cannot accumulate well even if automatic regeneration is performed depending on usage conditions, and PM accumulates In some cases. In such a case, the manual regeneration that starts the regeneration by the operation input of the operator is performed.

  In the manual regeneration, the exhaust gas purification system inputs the PM accumulation amount, and outputs a warning signal that prompts regeneration when it is determined that the PM accumulation amount has exceeded a predetermined second threshold value. The operator looks at the warning display and operates the reproduction start instruction switch. The exhaust gas purification system inputs this operation signal and outputs a command signal for starting regeneration.

  Note that the second threshold is set to be larger than the first threshold, and automatic regeneration is performed with priority over manual regeneration. Moreover, since there is a possibility of causing problems such as an abnormal rise in the internal temperature of the filter due to the combustion of a large amount of collected PM and the melting damage of the filter derived therefrom, the exhaust gas purification system inputs the PM accumulation amount, When it is determined that the PM accumulation amount has exceeded the third threshold, both automatic regeneration and manual regeneration are stopped.

  By the way, working machines such as a wheel loader and a hydraulic excavator may work in an environment where flammable materials exist around. For example, as such work, there are a work of transporting wood chips indoors, a work of dismantling that generates dust and the like. When the filter is forcibly regenerated, the exhaust gas temperature is maintained at a high temperature for a predetermined time (for example, several minutes). Therefore, if the filter is forcibly regenerated in the above environment, there is a risk of ignition and danger. In particular, since automatic regeneration starts automatically, there is a possibility that the operator may not notice for a while after igniting. In order to avoid dangers such as ignition, regeneration must be prohibited.

  As techniques for prohibiting reproduction, the techniques of Patent Document 1 and Patent Document 2 have been proposed.

  The exhaust gas purification system (engine control device) described in Patent Document 1 includes distance detection means for detecting a parameter related to the distance between the exhaust port of the vehicle and another structure adjacent to the vehicle, and the parameter is equal to or less than a predetermined value. In this case, playback is prohibited. In other words, regeneration is automatically prohibited when a structure approaches the exhaust port.

  The exhaust gas purification system described in Patent Document 2 includes a regeneration cancellation switch, and stops the operation of the regeneration device when a regeneration cancellation command is issued by the regeneration cancellation switch. As a result, the forced regeneration is immediately terminated and the operation can be resumed promptly.

JP 2005-127206 A JP 2009-79500 A

  When working in an environment where flammables are present in the surroundings, if the regeneration release switch of the exhaust gas purification system described in Patent Document 2 is applied as a regeneration prohibition instruction means and the regeneration prohibition instruction means is operated at the operator's discretion, regeneration is possible. It can be terminated and the danger of ignition etc. can be avoided. However, the following problems arise.

  If the automatic regeneration is prohibited by the regeneration prohibition instruction means and the operation is continued, PM further accumulates. When the PM deposition amount exceeds the second threshold, the operator needs to perform manual regeneration. However, in an environment where there are combustible materials in the surrounding area, there is a risk of ignition, so the operator cannot perform manual regeneration. If the operation is continued in a state where automatic regeneration is prohibited and manual regeneration is not possible, more PM accumulates. If the PM is burned in a state where the PM deposition amount exceeds the third threshold, the filter may be melted or burnt out. In order to avoid such a worst situation, it is necessary to interrupt the work and move the work machine to a place where there is no flammable material (recyclable place) to ensure safety and manually regenerate the filter. .

  Thus, if automatic regeneration is prohibited by the regeneration prohibition instruction means, the operator must always work considering the amount of accumulated PM and worrying about when the work should be interrupted. I can not stand. As a result, work efficiency is reduced.

  Furthermore, there may be a case where a long distance movement to a recyclable place is required, for example, as in a work at a tunnel site. Further PM accumulates while the work implement is moved to a recyclable location. When the exhaust gas purification system determines that the PM accumulation amount has exceeded the third threshold value, both automatic regeneration and manual regeneration are prohibited. In other words, there may be a situation where the operator cannot manually regenerate and cannot move the work implement. In this case, the operator has to ask for maintenance, and the work efficiency further decreases.

  The exhaust gas purification system described in Patent Document 1 does not prohibit regeneration because the distance from the object (wood powder, etc.) cannot be detected when powder from wood chips or dust from disassembly is scattered. The danger of fire, etc. cannot be avoided.

  An object of the present invention is to allow an operator to grasp the amount of accumulated PM when prohibiting automatic regeneration control of a filter for collecting PM contained in exhaust gas in a traveling working machine such as a hydraulic excavator. Then, it is providing the display apparatus of the working machine which can improve working efficiency.

(1) In order to achieve the above object, the present invention provides a diesel engine, a filter that is disposed in an exhaust system of the engine and collects particulate matter contained in exhaust gas, and particles deposited on the filter. Regeneration means for regenerating the filter by burning and removing the particulate matter by fuel injection from the engine, and accumulation amount estimating means for estimating the accumulation amount of the particulate matter deposited on the filter based on the pressure loss of the filter A regeneration start instruction means for instructing operation start of the regeneration means, a regeneration prohibition instruction means for instructing prohibition of operation of the regeneration means, and a deposition amount estimated by the accumulation amount estimation means is greater than a predetermined first threshold value. Thus, when the automatic regeneration control function for operating the regeneration means and the accumulation amount estimated by the accumulation amount estimation means exceed a predetermined second threshold value, the regeneration start instruction means operates. Outputs a warning signal to prompt the said manual regeneration control functions for operating the reproducing means and reproducing start instruction means is operated, when the reproduction inhibition instructing means during non-operation of said reproducing means is operated the The regeneration means is disabled by disabling the automatic regeneration control function and the manual motion generation control function so that the operation of the regeneration means is not started , and the regeneration prohibition instruction means is operated during the operation of the regeneration means. When the operation is performed, the operation of the regeneration means is stopped, and the operation of the regeneration means is prohibited. In a display device for a work machine comprising a display screen and a display control device having a basic display function for displaying basic information related to the work machine on the display screen,示制control device, said when the working of the reproduction inhibition instructing means is the operation wherein the reproducing means is prohibited, and the reproduction inhibition display function in which the reproducing means displays that are in reproduction inhibition state, the reproduction inhibition instructing means when but the operation of the operation the reproducing device is inhibited, first the deposition amount display function the accumulation amount estimating means with a predetermined allowable deposition amount larger than the first threshold value to display the deposit amount estimated, the when reproduction inhibition instructing means operation of said reproducing means is operated is prohibited, the remaining usable the deposit amount estimating means with a predetermined allowable deposition amount larger than the first threshold value based on the accumulated amount of log estimated It is assumed to have a remaining usable time display function for displaying time.

  As described above, when the regeneration prohibition instruction unit is operated and the operation of the regeneration unit is prohibited, the first accumulation amount display function displays the allowable accumulation amount and the estimated current accumulation amount (PM accumulation amount screen display). . Thus, the display device can visually notify the operator of the current deposition amount with respect to the allowable deposition amount. The operator can grasp the PM accumulation amount by looking at the PM accumulation amount screen, and can make an appropriate work plan.

The accumulation amount estimating means estimates the accumulation amount of the particulate matter accumulated on the filter based on the latest pressure loss of the filter. That is, the PM accumulation amount screen is updated as needed. The operator can correct the work plan at any time by looking at the latest PM accumulation amount screen. As a result, work efficiency can be improved.
Further, when the reproduction inhibition instructing means is prohibited operation of the operation reproducing means, reproduction inhibition display function, the reproduction means displays that are in reproduction inhibition state. Thereby, the display device can prompt the operator to call attention.
Further, when the reproduction inhibition instructing means operation of the operating play means is prohibited, remaining usable time display function displays the remaining usable time. Thus, the display device can inform the operator of the remaining usable time as objective information. The operator grasps the PM accumulation amount by looking at the PM accumulation amount screen, sensuously estimates the remaining usable time, and makes a work plan. Further, by comparing the remaining usable time displayed on the display screen, a more detailed work plan can be made. As a result, work efficiency can be further improved.

  (2) In the above (1), preferably, the predetermined allowable accumulation amount larger than the first threshold value displayed by the display control device is a third threshold value that is an upper limit value that can be manually regenerated by operating the regeneration start instruction means. It shall be.

  Combustion of PM with more PM accumulated than the third threshold may cause problems such as an abnormal rise in the internal temperature of the filter and filter melting resulting therefrom. By displaying the third threshold value as the allowable accumulation amount, the operator finishes the work before the PM accumulation amount exceeds the third threshold value, moves the hydraulic excavator to a place where there is no flammable material (recyclable place), Manual regeneration is possible. Thereby, damage to the filter due to excessive PM deposition can be prevented.

  (3) In the above (1), it is preferable that the predetermined allowable accumulation amount larger than the first threshold displayed by the display control device is the second threshold.

  When it is necessary to move to a recyclable place for a long distance, PM may further accumulate and increase beyond the third threshold during the movement. By displaying the second threshold value as the allowable accumulation amount, the operator can finish the work before the PM accumulation amount exceeds the second threshold value. The difference between the third threshold value as the allowable deposition amount and the second threshold value as the allowable deposition amount is a safety allowance in consideration of an increase in the deposition amount during movement. In other words, even if PM accumulates further while moving, there is this safety allowance, so before the PM accumulates and exceeds the third threshold, the excavator can be moved to a recyclable place and manual regeneration can be performed. it can. Thereby, safety can be maintained.

  (4) In the above (1), preferably, further comprising: a display device operation unit; and a movement distance mode selection unit that selects either the near mode or the far mode by operation of the display device operation unit, The display control device has a permissible deposition amount selection function for selecting a second threshold value or a third threshold value that is an upper limit value that can be manually regenerated by operating the regeneration start instruction means as the permissible deposition amount. When the near mode is selected, the third threshold is selected, and when the far mode is selected, the second threshold is selected.

  Thereby, when a long distance movement to the recyclable place is not required, the third threshold value is selected as the allowable accumulation amount, and when a long distance movement is required to the recyclable place, the second threshold value is selected as the allowable accumulation amount. An appropriate work plan can be made while maintaining safety.

  (6) In the above (1), preferably, a display device operation unit is further provided, and the display control device is selectively operated by the operation of the display device operation unit when the operation of the reproducing means is not prohibited. The second deposition amount display function displays a predetermined allowable deposition amount greater than the first threshold and the deposition amount estimated by the deposition amount estimation means.

  Information such as the amount of accumulated PM is less important for the operator to work normally, and always displaying it not only interferes with the work, but also basic vehicle body information that should be conveyed to the driver. Cannot be properly transmitted, and the original basic display function of the display device is hindered.

  As described above, when the regeneration prohibition instruction unit is not operated and the operation of the regeneration unit is not prohibited, the second accumulation amount display function selectively displays the PM accumulation amount screen by the operation of the display device operation unit. That is, if the selection is not made by operation of the display device operation unit, the state in which the basic screen is displayed is maintained. Thereby, the display device can exhibit the original basic display function. As a result, work efficiency can be improved.

  According to the present invention, when the automatic regeneration control of the filter for collecting PM contained in the exhaust gas is prohibited, the operator looks at the PM accumulation amount screen to grasp the PM accumulation amount, and performs an appropriate work plan. It is possible to improve work efficiency by making a plan and amending the work plan as needed.

1 is a diagram illustrating an overall configuration of a display device and an exhaust gas purification system according to a first embodiment of the present invention. It is a figure which shows the detail of the control apparatus shown in FIG. It is a figure which shows the external appearance of the hydraulic shovel which is an example of a working machine. It is a flowchart which shows the content of the calculation process of the regeneration control of the regeneration determination part of a vehicle body control apparatus. It is a figure which shows the relationship between the pressure loss (front-back differential pressure) of a filter, and the accumulation amount of PM. It is a flowchart which shows the content of the calculation process of the display control of a display control apparatus. This is the basic screen displayed on the display screen during normal operation It is a figure explaining the operation of the operator at the normal time. It is an example of the screen displayed on a display screen at the time of reproduction prohibition. It is a figure which shows the time history of PM deposition amount. It is a figure explaining operation of an operator about display setting at the time of reproduction prohibition. It is a flowchart which shows the content of the calculation process of the display control of the display control apparatus in 2nd Embodiment. It is a flowchart which shows the content of the calculation process of the display control of the display control apparatus in 4th Embodiment. It is a figure explaining operation of an operator about movement distance mode selection.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

~Constitution~
FIG. 1 is a diagram showing an overall configuration of a display device and an exhaust gas purification system according to the first embodiment.

In FIG. 1, the working machine according to the present embodiment is, for example, a hydraulic excavator. The hydraulic excavator includes a diesel engine (hereinafter simply referred to as an engine) 1 equipped with an electronic governor 1a (an electronically controlled fuel injection control device). Have. The target engine speed of the engine 1 is commanded by the engine control dial 2 provided in the cabin (operator's cab) 107 (see FIG. 3 ) of the hydraulic excavator, and the actual engine speed of the engine 1 is detected by the engine speed detector 3. The The command signal of the engine control dial 2 and the detection signal of the rotation speed detection device 3 are input to the control device 4, and the control device 4 is based on the command signal (target rotation speed) and the detection signal (actual rotation speed). 1a is controlled, and the rotation speed and torque of the engine 1 are controlled. Further, as a start / stop command device for the engine 1, a key switch 5 is provided in the cabin 107, and a command signal of the key switch 5 is also input to the control device 4, and the control device 4 starts the starter (see FIG. (Not shown) and the electronic governor 1a are controlled to start and stop the engine 1.

  The exhaust gas purification system 30 is mounted on the working machine (hydraulic excavator) as described above, and is disposed in the exhaust pipe 31 constituting the exhaust system of the engine 1 to collect particulate matter (PM) contained in the exhaust gas. Filter 32 and the DPF device 34 including the oxidation catalyst 33 disposed on the upstream side of the filter 32, the exhaust gas temperature detection device 35, and the pressure loss of the filter 32 (the differential pressure between the upstream side and the downstream side of the filter 32). Provided between the engine 1 and the DPF device 34 of the exhaust pipe 31, a differential pressure detection device 36 to detect, a regeneration start switch 37 (regeneration start instruction means), a regeneration prohibition switch 38 (regeneration prohibition instruction means). And a fuel injection device 39 for regeneration.

  The regeneration fuel injection device 39 constitutes a regeneration means for the filter 32 that raises the temperature of the exhaust gas and incinerates and removes PM accumulated on the filter 32. The regeneration start switch 37 and the regeneration prohibition switch 38 are disposed at positions in the cabin 107 of the excavator that are easily operated by the operator. The regeneration start switch 37 is an operation means for instructing the start of operation of the regeneration fuel injection device 39 (regeneration means) (regeneration control start of the filter 32). When the regeneration start switch 37 is operated to the ON position, the regeneration control is started. A command signal for instructing is output. The regeneration prohibiting switch 38 is an operating means for instructing prohibition of the operation of the regeneration fuel injection device 39 (regenerating means) (prohibiting regeneration control of the filter 32). When the regeneration prohibiting switch 38 is operated to the ON position, the regeneration control is prohibited. A command signal for instructing is output.

  The control device 4 receives the command signals from the regeneration start switch 37 and the regeneration prohibition switch 38, and these command signals, the detection signal from the differential pressure detection device 36, the command signal from the engine control dial 2 and the rotational speed. Based on the detection signal of the detection device 3, a calculation process of regeneration control is performed, and the electronic governor 1a and the regeneration fuel injection device 39 are controlled according to the calculation result. The control device 4 also includes information indicated by various signals from the rotation speed detection device 3, the key switch 5, the differential pressure detection device 36, the regeneration start switch 37, and the regeneration prohibition switch 38, and calculation processing results of the regeneration control of the control device 4. As a display signal to the display device 6 to display the information on the display screen 6a.

  The display device 6 is disposed at a position in the hydraulic excavator cabin 107 where the operator can easily see, and originally displays basic information of the hydraulic excavator body such as the remaining fuel amount and the coolant temperature. The display device 6 includes a display screen 6a and operation switches 6b, and is controlled by a display control device 42 (described later) of the control device 4. The operation switch 6b is arranged on the lower side of the display screen 6a, and vehicle information other than the vehicle body basic information is selectively displayed by operating the operation switch 6b. Furthermore, information related to reproduction, such as a warning prompting the operation of the reproduction start switch 37, indicating that automatic reproduction control is being performed, is also displayed as appropriate.

  FIG. 2 is a diagram showing details of the control device 4. The control device 4 includes a vehicle body control device 41 including a regeneration determination unit 41a, a display control device 42, and an engine control device 43. These control devices 41 to 43 are connected to each other via a communication line 44. The vehicle body network is configured. The command signal from the engine control dial 2, the detection signal from the differential pressure detection device 36, the command signal from the regeneration start switch 37 and the regeneration prohibition switch 38 are input to the vehicle body control device 41, and the command signal from the key switch 5 and the rotational speed detection device. The detection signal 3 is input to the engine control device 43.

  The engine control device 43 receives the command signal of the engine control dial 2 via the communication line 44, and based on the command signal and the detection signal of the rotation speed detection device 3, the engine speed and torque of the engine 1 are obtained as described above. Control. Further, the engine control device 43 controls a starter (not shown) and the electronic governor 1a based on a command signal from the key switch 5, and controls starting and stopping of the engine 1.

  The vehicle body control device 41 electronically controls a hydraulic system (not shown) of a hydraulic excavator. For example, the vehicle body control device 41 detects an operation amount of an operation lever and discharges a flow rate corresponding to the operation amount. Control the tilt angle (capacity). Further, the vehicle body control device 41 includes a regeneration determination unit 41a. The regeneration determination unit 41a estimates the PM accumulation amount accumulated on the filter 32 based on the detection signal (pressure loss) of the differential pressure detection device 36, and performs communication. Based on the detection signal of the rotation speed detection device 3 received via the line 44, the command signal of the engine control dial 2, the command signal from the playback start switch 37 and the playback prohibition switch 38, the calculation processing of the playback control is performed. A control signal corresponding to the result is transmitted to the engine control device 43 via the communication line 44, and the engine control device 43 controls the electronic governor 1a and the regeneration fuel injection device 39 according to the control signal.

  The display control device 42 communicates various signals from the rotation speed detection device 3, the key switch 5, the differential pressure detection device 36, the regeneration start switch 37, the regeneration prohibiting switch 38, and the operation processing result of the forced regeneration control of the regeneration determining unit 41a. The information is received via the line 44, and as described above, the signal information and the calculation processing result are sent to the display device 6 as display signals, and the information is displayed on the display screen 6a.

  In addition to the basic display unit 42a, the display control device 42 has a regeneration prohibition display unit 42b, a first accumulation amount display unit 42c, a second accumulation amount display unit 42d, and a remaining usable time display unit 42e as characteristic features. Each unit performs display control to be described later.

  FIG. 3 is a diagram illustrating an appearance of a hydraulic excavator that is an example of a working machine. The hydraulic excavator includes a lower traveling body 100, an upper swing body 101, and a front work machine 102. The lower traveling body 100 has left and right crawler traveling devices 103a and 103b, and is driven by left and right traveling motors 104a and 104b. The upper swing body 101 is turnably mounted on the lower traveling body 100 by the swing motor 105, and the front work machine 102 is attached to the front portion of the upper swing body 101 so as to be able to be raised and lowered. The upper swing body 101 is provided with an engine room 106 and a cabin (operating room) 107. The engine 1 is disposed in the engine room 106, and an engine control dial 2, a key switch 5, a display device 6 and a regeneration unit are arranged at appropriate positions in the cabin 107. A start switch 37 and a regeneration prohibiting switch 38 are installed.

  The front work machine 102 has an articulated structure having a boom 111, an arm 112, and a bucket 113. The boom 111 rotates in the vertical direction by expansion and contraction of the boom cylinder 114. , And the bucket 113 is rotated up and down and back and forth by the expansion and contraction of the bucket cylinder 116.

~control~
<Playback control>
FIG. 4 is a flowchart showing the contents of the regeneration control calculation process of the regeneration determination unit 41a of the vehicle body control device 41. The regeneration determination unit 41a has an automatic regeneration control function, a manual regeneration control function, and a regeneration prohibition control function.

  In FIG. 4, the reproduction determination unit 41a first determines whether or not the reproduction prohibition switch 38 has been operated (reproduction prohibition switch ON) (step S100), and the reproduction prohibition switch 38 has not been operated (reproduction prohibition switch OFF). ), It is determined whether or not the estimated accumulation amount based on the detection signal of the differential pressure detection device 36 is larger than the second threshold value which is the manual regeneration start value (step S110), and the estimated accumulation amount is the second threshold value. If it is determined that there is not more, it is determined whether or not the estimated accumulation amount is greater than a first threshold value that is an automatic regeneration start value (step S120).

  If it is determined in step S120 that the estimated accumulation amount is not larger than the first threshold value, the procedure returns to the procedure immediately after the start and the regeneration prohibiting switch 38 is operated or the estimated accumulation amount is larger than the first threshold value or the second threshold value. Until it becomes, the process of step S100, S110, S120 is repeated.

  If it is determined in step S120 that the estimated accumulation amount is larger than the first threshold, automatic regeneration control is started (step S130). During automatic regeneration control, it is determined whether or not the regeneration prohibition switch 38 has been operated (regeneration prohibition switch ON) (step S140), and if it is determined that the regeneration prohibition switch 38 has not been operated (regeneration prohibition switch OFF). Then, it is determined whether or not the estimated accumulation amount has become smaller than the fourth threshold value which is the regeneration end value (step S150), and when it is determined that the estimated accumulation amount has become smaller than the fourth threshold value, the automatic regeneration control is stopped (step S150). S160), the calculation process is terminated (step S170). If it is determined in step S150 that the estimated accumulation amount is not less than the fourth threshold value, the processes in steps S140 and S150 are repeated until the regeneration prohibiting switch 38 is operated or the estimated accumulation amount is less than the fourth threshold value. .

  If it is determined in step S110 that the estimated accumulation amount is greater than the second threshold value, a warning signal that prompts the operator to operate the regeneration start switch 37 is output (step S210). Note that the display control device 42 inputs a warning signal via the communication line 44 and displays a warning for prompting manual regeneration on the display screen 6a.

  It is determined whether or not the reproduction start switch 37 has been operated (reproduction start switch ON) (step S220). If it is determined that the reproduction start switch 37 has not been operated (reproduction start switch OFF), the procedure immediately after the start is performed. The process of steps S100, S110, S210, and S220 is repeated until the playback start switch 37 is operated. That is, a warning is displayed until the playback start switch 37 is operated.

  If it is determined in step S220 that the regeneration start switch 37 has been operated (regeneration start switch ON), manual regeneration control is started (step S230). During manual regeneration control, it is determined whether or not the regeneration prohibiting switch 38 has been operated (regeneration prohibiting switch ON) (step S240), and if it is determined that the regeneration prohibiting switch 38 has not been operated (regeneration prohibiting switch OFF). Then, it is determined whether or not the estimated accumulation amount has become smaller than the fourth threshold value that is the regeneration end value (step S250). If it is determined that the estimated accumulation amount has become smaller than the fourth threshold value, the manual regeneration control is stopped (step S250). S260), the calculation process is terminated (step S170). If it is determined in step S250 that the estimated accumulation amount is not less than the fourth threshold value, the processes of steps S240 and S250 are repeated until the regeneration prohibiting switch 38 is operated or the estimated accumulation amount is less than the fourth threshold value. .

  If it is determined in step S100 that the regeneration prohibiting switch 38 has been operated (the regeneration prohibiting switch is ON), the arithmetic processing is terminated (step S170). If it is determined in step 140 that the regeneration prohibition switch 38 has been operated during the automatic regeneration control (regeneration prohibition switch ON), the automatic regeneration control is stopped (step S160), and the arithmetic processing is terminated (step S170). If it is determined in step 240 that the regeneration prohibition switch 38 has been operated during the manual regeneration control (regeneration prohibition switch ON), the manual regeneration control is stopped (step S260), and the calculation process is terminated (step S170).

  In step S150 and step S250, the regeneration determination unit 41a determines whether or not the estimated accumulation amount based on the detection signal of the differential pressure detection device 36 is less than the fourth threshold, and ends the regeneration control. It may be determined whether the playback control time has passed a predetermined time and the playback control may be terminated.

  The automatic regeneration control in step S130 and the manual regeneration control in step S230 are performed as follows, for example. First, the rotational speed of the engine 1 is controlled to a predetermined rotational speed Na suitable for forced regeneration control. The predetermined rotation speed Na suitable for the forced regeneration control is a rotation speed that can raise the temperature of the exhaust gas at that time to a temperature higher than the activation temperature of the oxidation catalyst 33, and is, for example, a medium speed rotation of about 1800 rpm. Is a number. In this control, the vehicle body control device 41 switches the target rotational speed of the engine 1 from the target rotational speed (low-speed idle rotational speed) indicated by the engine control dial 2 to a predetermined rotational speed Na, and the predetermined rotational speed Na (target The number of revolutions) is transmitted to the engine control device 43 via the communication line 44. The engine control device 43 feedback-controls the fuel injection amount of the electronic governor 1a based on the target rotational speed (predetermined rotational speed Na) and the actual rotational speed of the engine 1 detected by the rotational speed detection device 3, and the engine 1 The number of rotations is controlled to the predetermined number of rotations Na.

  Next, when it is confirmed that the exhaust gas temperature detected by the exhaust temperature detection device 35 has risen to a predetermined temperature (a temperature higher than the activation temperature of the oxidation catalyst 33), the regeneration fuel injection device 39 is controlled to exhaust the exhaust gas. Fuel is injected into the pipe 31. By injecting fuel into the exhaust pipe 31, unburned fuel is supplied to the oxidation catalyst 33. The unburned fuel is oxidized by the oxidation catalyst 33, and the exhaust gas temperature further rises due to the reaction heat obtained at that time. The PM deposited on the filter 32 is removed by incineration.

  When the forced regeneration control is stopped in step S160 and step S260, the target rotational speed is returned to the target rotational speed (low speed idle rotational speed) indicated by the engine control dial 2, and the control of the regeneration fuel injection device 39 is stopped. Instead of returning the target rotational speed to the target rotational speed (low-speed idle rotational speed) indicated by the engine control dial 2, the engine 1 may be stopped.

  FIG. 5 is a graph showing the relationship between the pressure loss ΔP (front / rear differential pressure) of the filter 32 and the PM deposition amount W. As shown in FIG. The relationship between the pressure loss ΔP and the PM deposition amount W is determined in advance based on experimental data. In FIG. 5, for convenience, the relationship between the pressure loss ΔP and the PM deposition amount W is shown in a linear proportion, but the actual relationship between the pressure loss ΔP and the PM deposition amount W is not a linear proportion. The amount of PM deposited on the filter 32 is estimated based on the pressure loss by the differential pressure detector 36. When PM is not deposited on the filter 32, there is no pressure loss due to the effect of PM deposition, the pressure loss ΔP is ΔP0, and as the PM is deposited on the filter 32 and the deposition amount W increases, the differential pressure ΔP is increased. To rise.

  The first threshold value is a value corresponding to the accumulation amount at which automatic regeneration control is to be started. The second threshold value is a value corresponding to the accumulation amount that should prompt the operator to perform manual regeneration control. The third threshold value is a reproducible upper limit value. In other words, if PM is burned in a state where PM has accumulated more than the third threshold, problems such as abnormal rise in the internal temperature of the filter and melting of the filter resulting from it may occur, so automatic regeneration control, manual regeneration Both control is stopped. The fourth threshold value is a value corresponding to the accumulation amount that can be regarded as having been completed for both automatic regeneration control and manual regeneration control.

  A relationship between the reproduction control and the threshold will be described. The second threshold is set larger than the first threshold, and automatic regeneration control is performed with priority over manual regeneration control. However, there are cases where PM cannot be burned and removed satisfactorily even by automatic regeneration control due to various factors, and PM is further deposited. When the accumulation amount exceeds the second threshold value, manual regeneration control is performed. However, when the accumulation amount exceeds the third threshold, neither automatic regeneration control nor manual regeneration control is performed. When the PM can be burned and removed satisfactorily and the accumulation amount becomes less than the fourth threshold value, both the automatic regeneration control and the manual regeneration control are finished.

  ΔW in the figure is a difference between the third threshold value and the current accumulation amount, that is, a value indicating how much PM the filter 32 can collect (remaining accumulation amount).

<Display control>
FIG. 6 is a flowchart showing the content of display control calculation processing of the display control device 42. In addition to the basic display function (basic display unit 42a shown in FIG. 2), the display control device 42 has a characteristic function that is the first accumulation amount that is activated when the regeneration prohibiting switch 38 is operated (the regeneration prohibiting switch is ON). The display function (first accumulation amount display part 42c), the regeneration prohibition display function (regeneration prohibition display part 42b), the remaining usable time display function (remaining usable time display part 42e), and the regeneration prohibition switch 38 are not operated. And a second accumulation amount display function (second accumulation amount display portion 42d) which is activated when the regeneration prohibiting switch is OFF.

  The display control device 42 first displays a basic screen (FIG. 7) on the display screen 6a as an initial screen (step S300). Next, it is determined whether or not the regeneration prohibition switch 38 has been operated (regeneration prohibition switch ON) (step S310).

  If it is determined in step S310 that the regeneration prohibiting switch 38 has not been operated (reproduction prohibiting switch OFF), it is determined whether or not the menu switch of the operation switches 6b has been pressed (ON or not) (step S320). If the menu switch is not pressed, the processes in steps S300 and S310 are repeated. That is, the state where the basic screen is displayed is maintained.

  If it is determined in step S320 that the menu switch has been pressed (menu switch ON), the display screen 6a is switched from the basic screen 100 to the menu screen (see FIG. 8) (step S330). The menu screen has a hierarchical structure, and is switched to a detailed menu screen (see FIG. 8) regarding the exhaust gas filter by operating the function key of the operation switch 6b.

  In the detailed menu screen related to the exhaust gas filter, it is determined whether or not the “PM accumulation amount” item is selected as a display item (step S340), and if it is determined that the “PM accumulation amount” item is selected, it corresponds to the third threshold value. A PM deposition amount screen (see FIG. 8) is displayed in which the allowable accumulation amount is displayed on a white background and the accumulation amount estimated based on the pressure loss by the differential pressure detection device 36 is displayed on a black background (step S350). When the PM accumulation amount screen is displayed for a predetermined time, the PM accumulation amount screen disappears (step S360), and the detailed menu screen relating to the exhaust gas filter returns.

  When it is determined in step S340 that the “PM accumulation amount” item is not selected, or when the detailed menu screen related to the exhaust gas filter is returned in step S360, it is determined whether the “remaining usable time” item is selected as a display item. If it is determined (step S370) and it is determined that the “remaining usable time” item is selected, the calculation is performed based on the third threshold value and the history of the accumulation amount estimated based on the pressure loss by the differential pressure detection device 36. The remaining usable time is displayed (step S380). When the remaining usable time is displayed for a predetermined time, the display of the remaining usable time disappears (step S390), and the detailed menu screen relating to the exhaust gas filter returns. The calculation of the remaining usable time will be described later.

  If it is determined in step S370 that the “remaining usable time” item has not been selected, or if the detailed menu screen related to the exhaust gas filter is returned in step S390, the function key of the operation switch 6b is operated to return to the basic screen.

  On the detailed menu screen related to the exhaust gas filter, the cursor can be moved downward by pressing the function key of the operation switch 6b corresponding to “down”, and the cursor can be moved upward by pressing the function key corresponding to “up”. be able to. Whether the “PM accumulation amount” item or the “remaining usable time” item is selected is determined based on whether or not the function key corresponding to “OK” is pressed while the cursor is displayed on the corresponding item.

  In step S360 and step S390, the display control device 42 performs processing so that the display automatically disappears and returns to the detailed menu screen related to the exhaust gas filter when a predetermined time elapses. Thus, the display may disappear and the process may return to the detailed menu screen related to the exhaust gas filter.

  If it is determined in step S310 that the playback prohibition switch 38 has been operated (playback prohibition switch ON), a message indicating that the playback apparatus is in a playback prohibition state (see FIG. 9) is additionally displayed on the basic screen (step S420).

  Next, the display setting when reproduction is prohibited is read (step S430). The display setting when reproduction is prohibited will be described later in the description of the operation. It is determined whether or not the display setting when regeneration is prohibited is set to display the PM accumulation amount (setting ON) (step S440), and is set to display the PM accumulation amount (setting ON). Is determined, the PM accumulation amount screen (see FIG. 9) is displayed in which the allowable accumulation amount corresponding to the third threshold is displayed on a white background, and the accumulation amount estimated based on the pressure loss by the differential pressure detection device 36 is displayed on a black background. An additional display is made on the basic screen (step S450).

  If it is determined in step S440 that the PM accumulation amount is not set to be displayed (setting OFF), or if the PM accumulation amount screen is additionally displayed on the basic screen in step S450, the remaining display settings for the regeneration prohibition are left. It is determined whether or not it is set to display the usable time (setting ON) (step S470), and if it is determined that the remaining usable time is set to be displayed (setting ON), The remaining usable time (see FIG. 9) calculated based on the three threshold values and the accumulation amount history estimated based on the pressure loss by the differential pressure detector 36 is additionally displayed on the basic screen (step S480).

  If it is determined in step S470 that the remaining usable time is not set to be displayed (setting OFF) or if the remaining usable time is additionally displayed on the basic screen in step S480, the calculation process is terminated.

~ Correspondence ~
In the above, the oxidation catalyst 33 and the regeneration fuel injection device 39 constitute a regeneration means for regenerating the filter 32 by burning and removing the particulate matter (PM) deposited on the filter 32 by fuel injection from the engine 1. A part of the functions of the differential pressure detection device 36 and the regeneration determination unit 41a constitutes a deposition amount estimation means for estimating the amount of PM deposited on the filter 32 based on the pressure loss of the filter 32, and a regeneration start switch 37. Constitutes a regeneration start instructing means for instructing the start of operation of the regeneration fuel injection device 39, and the regeneration prohibiting switch 38 constitutes a regeneration prohibition instructing means for instructing prohibition of the operation of the regeneration fuel injection device 39, and the regeneration determination The unit 41a constitutes a playback control device.

Of the processes of the regeneration determination unit 41a, the processes of steps S120 and S130 constitute an automatic regeneration control function that activates the regeneration fuel injection device 39 when the estimated accumulation amount exceeds the first threshold, and steps S110 and S210. , S220, S230 outputs a warning signal that prompts the operation of the regeneration start switch 37 when the estimated accumulation amount exceeds the second threshold, and when the regeneration start switch 37 is operated, the fuel injection device for regeneration 39 A manual regeneration control function for activating the regeneration is configured, and the processing of steps S100, S140, and S240 constitutes a regeneration prohibition control function for inhibiting the operation of the regeneration fuel injection device 39 when the regeneration prohibiting switch 38 is operated.
The display control device 42 constitutes a display control device that displays vehicle body information related to the hydraulic excavator on the display screen 6a.

  Of the processes of the basic display unit 42a and the display control device 42, the processes of steps S300, S320, and S330 constitute a basic display function for displaying basic information.

Of the processes of the first accumulation amount display unit 42c and the display control device 42, the processes of steps S310, S440, and S450 are performed by operating the regeneration prohibition instructing means (regeneration prohibition switch 38) and prohibiting the operation of the regeneration fuel injection apparatus 39. when the constitutes the first accumulation amount display function for displaying the deposited amount estimated as allowable deposition amount corresponding to the third threshold value.

Reproduction processing of prohibiting the display 42b and step S310, S420, when the operation of the reproduction inhibition instructing means (reproduction inhibition switch 38) is operated regeneration fuel injection device 39 is prohibited, regeneration fuel injection device 39 is reproduced A reproduction prohibition display function for displaying the prohibition state is configured.

  In the processing of the second accumulation amount display 42d and steps S310, S340, and S350, when the operation of the regeneration fuel injection device 39 is not prohibited, the permissible accumulation corresponding to the third threshold value is selectively performed by operating the operation switch 6b. A second accumulation amount display function for displaying the amount and the estimated accumulation amount is configured.

Processing the remaining usable time display unit 42e and S480, when the operation of the reproduction inhibition instructing means (reproduction inhibition switch 38) is operated regeneration fuel injection device 39 is prohibited, permitted deposits corresponding to the third threshold value The remaining usable time display function for displaying the remaining usable time based on the amount and the history of the estimated accumulation amount is configured.

~ Operation ~
<Normal time>
FIG. 7 shows a basic screen displayed on the display screen 6a at the normal time. The operator of the hydraulic excavator can know basic vehicle body information such as the remaining fuel amount, the coolant temperature, and the hydraulic oil temperature by viewing the basic screen. Further, the automatic regeneration control is started (step S130), this fact as appropriate is additionally displayed on the display screen 6a. When a warning signal for prompting the operator to perform manual regeneration is output (step S210), this is additionally displayed on the display screen 6a.

  By the way, the information such as the PM accumulation amount is information that is low in importance for the operator to perform the work at normal time, and always displaying it not only obstructs the work but also the vehicle body that should be conveyed to the driver originally. Basic information cannot be properly transmitted, and the original display function of the display device is hindered. The display device 6 of the present embodiment selectively displays a deposition amount screen by operating the operation switch 6b during normal times (when the operation of the regeneration device is not prohibited). That is, if the selection is not made by operating the operation switch 6b, the state in which the basic screen is displayed is maintained (steps S300 → S310 → S320 → S310). Thereby, the display apparatus 6 can exhibit an original display function (basic display function). As a result, work efficiency can be improved.

  When the operator wants to confirm the state of the PM accumulation amount during normal operation, the following operation is performed.

  FIG. 8 is a diagram for explaining the operation of the operator at the normal time (not at the time of reproduction prohibition). When the operator presses the menu switch of the operation switch 6b while the basic screen is displayed, the display screen 6a is switched to the menu screen. A plurality of items are displayed on the menu screen. When the operator selects the “exhaust gas filter function” item by operating a function key, the menu screen is switched to a detailed menu screen related to the exhaust gas filter. Further, by operating the function key and selecting, for example, the “PM accumulation amount display” item, the PM accumulation amount is displayed (steps S300 → S310 → S320 → S330 → S340 → S350) (second accumulation amount display) function). Similarly, the remaining usable time is displayed by selecting the “remaining usable time display” item.

<When playback is prohibited>
A hydraulic excavator may work in an environment where flammable materials are present. Examples of such work include indoor wood chip transportation work and dismantling work that generates dust and the like. When the filter 32 is forcibly regenerated, the exhaust gas temperature is kept at a high temperature for a predetermined time. Therefore, if the filter 32 is forcibly regenerated in the above environment, there is a risk of ignition and danger. In particular, automatic regeneration control is dangerous because it starts without the operator's knowledge. In order to avoid dangers such as ignition, automatic regeneration control is not started when the operator operates the regeneration prohibiting switch 38 (switch ON) (steps S100 → S170). If the operator operates the regeneration prohibiting switch 38 during automatic regeneration control or manual regeneration control (switch ON), regeneration control stops (steps S130 → S140 → S160 → S170, steps S230 → S240 → S260 → S170).

  On the other hand, in the regeneration prohibited state, PM further accumulates. If PM is burned in a state where the PM accumulation amount exceeds the third threshold, the filter 32 may be melted or burnt out. Therefore, the operator makes an appropriate work plan, finishes work before the PM accumulation amount exceeds the third threshold, moves the excavator to a place where there is no flammable material (recyclable place), and performs manual regeneration. There is a need to. The operator makes an appropriate work plan and modifies the work plan as needed while viewing the screen shown in FIG.

  FIG. 9 is an example of a screen displayed on the display screen 6a when reproduction is prohibited. On the basic screen shown in FIG. 7, the fact that the regeneration is prohibited, the PM accumulation amount screen, and the remaining usable time are additionally displayed.

  When the operator operates the regeneration prohibition switch 38 (switch ON), a message indicating that the regeneration is prohibited is additionally displayed (steps S300 → S310 → S420) (reproduction prohibition display function). Thereby, the display device 6 can prompt the operator to call attention.

  Further, the display setting when regeneration is prohibited is read, and the PM accumulation amount screen and the remaining usable time are additionally displayed (steps S430 → S440 → S450 → S470 → S480) (first accumulation amount display function) (remaining Usable time display function). The display setting when regeneration is prohibited is set as described later. In principle, the setting items of “PM accumulation amount display” and “remaining usable time display” are also set to ON.

  In the PM accumulation amount screen, the number of indicators corresponding to the allowable accumulation amount corresponding to the third threshold is white, and the number of indicators corresponding to the accumulation amount estimated based on the pressure loss by the differential pressure detection device 36 is black. , Are displayed superimposed. For example, in FIG. 9, among the white background indices relating to the six permissible accumulation amounts, the black background indices relating to the three current accumulation amounts are filled. That is, it means that the current accumulation amount is half of the allowable accumulation amount. In other words, of the six white background indicators, the three white background indicators that are not filled with the three black background indicators mean the remaining accumulation amount ΔW (FIG. 5).

  Thereby, the display device 6 can visually notify the operator of the current accumulation amount with respect to the allowable accumulation amount. The operator can grasp the PM accumulation amount by looking at the PM accumulation amount screen, and can make an appropriate work plan. For example, when the current accumulation amount (black background index) is small, an operation that requires a long time is planned, and when the current accumulation amount is large, an operation that can be performed in a short time is planned.

  On the PM accumulation amount screen, the accumulation amount estimated based on the pressure loss by the latest differential pressure detector 36 is always displayed. Thereby, the operator can correct the work plan at any time by looking at the latest PM accumulation amount screen. When the deposition amount does not increase from the operator's prediction, the work time is extended, and when the deposition amount increases from the operator's prediction, the work time is shortened. As a result, work efficiency can be improved.

  The remaining usable time is the time until the accumulation amount reaches the third threshold value, and includes the third threshold value that is the allowable accumulation amount and the accumulation amount history estimated based on the pressure loss by the differential pressure detection device 36. Predicted based on.

  Thereby, the display device 6 can inform the operator of the remaining usable time as objective information. The operator grasps the PM accumulation amount by looking at the PM accumulation amount screen, sensuously estimates the remaining usable time, and makes a work plan. Further, by comparing the remaining usable time displayed on the display screen 6a, a more detailed work plan can be made. As a result, work efficiency can be further improved.

  FIG. 10 is a diagram showing a time history of the PM accumulation amount. A method for predicting the remaining usable time will be described with reference to FIG. The amount of increase in deposition per unit time is obtained from the history of the latest amount of deposition. The remaining depositable amount ΔW (see FIG. 5) is obtained from the difference between the third threshold value and the current deposition amount. The remaining usable time ΔW is obtained by dividing the remaining depositable amount ΔW by the deposition increase amount per unit time. Since the history of the latest accumulation amount changes at any time, the remaining usable time also changes at any time.

  FIG. 11 is a diagram for explaining an operator's operation for display setting when reproduction is prohibited. As described above, in principle, both the “PM accumulation amount display” and “remaining usable time display” setting items are set to ON, and the PM accumulation amount screen and the remaining usable time are automatically displayed additionally. . The operator does not need to perform any operation.

  By the way, the information such as the amount of accumulated PM is less important information for the operator as long as the operator knows the PM accumulation state, and always displaying the information only disturbs the operation. Accordingly, basic vehicle body information that should originally be transmitted to the driver cannot be properly transmitted, and the original display function of the display device is hindered. In such a case, the PM accumulation amount screen and the remaining usable time can be prevented from being additionally displayed at the operator's discretion.

  If the operator feels that the additional display such as the PM accumulation amount is troublesome, the operator performs display setting when reproduction is prohibited. When the operator presses the menu switch of the operation switch 6b while the screen shown in FIG. 9 is displayed, the display screen 6a is switched to the menu screen. A plurality of items are displayed on the menu screen. When the operator selects the “exhaust gas filter function” item by operating a function key, the menu screen is switched to a detailed menu screen related to the exhaust gas filter. Further, when the “display prohibition display setting” item is selected by operating the function key, the display is switched to the display prohibition display setting screen. When the cursor is moved from ON to OFF by operating the function key, the setting items of “PM accumulation amount display” and “remaining usable time display” are also set to OFF.

  The changed display prohibition display setting is read again, and even if the regeneration prohibition switch 38 is ON, the PM accumulation amount screen and the remaining usable time are not additionally displayed, only the fact that the regeneration is prohibited is added. It is displayed (steps S300 → S310 → S420 → S430 → S440 → S470). Thereby, the display apparatus 6 can exhibit an original display function (basic display function). As a result, work efficiency can be improved.

~effect~
According to 1st Embodiment comprised as mentioned above, the following effect is acquired.

  When the operator operates the regeneration prohibiting switch 38 (switch ON), a PM accumulation amount screen is additionally displayed. The display device 6 can visually notify the operator of the current deposition amount relative to the allowable deposition amount. The operator can grasp the PM accumulation amount by looking at the PM accumulation amount screen, and can make an appropriate work plan.

  The operator can correct the work plan at any time by looking at the latest PM accumulation amount screen. As a result, work efficiency can be improved.

  Further, by additionally displaying the remaining usable time, the display device 6 can inform the operator of the remaining usable time as objective information. The operator grasps the PM accumulation amount by looking at the PM accumulation amount screen, sensuously estimates the remaining usable time, and makes a work plan. Further, by comparing the remaining usable time displayed on the display screen 6a, a more detailed work plan can be made. As a result, work efficiency can be further improved.

  Further, the display device 6 can prompt the operator to call attention by additionally displaying that the reproduction is prohibited.

  On the other hand, when the operator does not operate the regeneration prohibiting switch 38 (switch OFF), the display device 6 selectively displays a deposition amount screen by operating the operation switch 6b. In other words, if the operation switch 6b is not selected, the basic screen is displayed. Thereby, the display apparatus 6 can exhibit an original display function (basic display function). As a result, work efficiency can be improved.

  In the first embodiment, when the operator operates the regeneration prohibition switch 38 (switch ON), the regeneration prohibition state, the PM accumulation amount screen, and the remaining usable time are additionally displayed. The first accumulation amount display unit 42c may be included and the PM accumulation amount screen may be displayed.

Second Embodiment
Although the first embodiment of the present invention has been described above, the present invention is not limited to these embodiments, and various modifications can be made within the spirit of the present invention. For example, in the first embodiment, the display control device 42 reads the display setting when reproduction is prohibited, determines whether the setting is ON, and if the setting is ON, additionally displays the PM accumulation amount screen on the basic screen. The remaining usable time is additionally displayed on the basic screen (steps S430 → S440 → S450 → S470 → S480), but the PM accumulation amount screen and the remaining usable can be used without reading and determining the display setting when reproduction is prohibited. The time may be additionally displayed on the basic screen.

  FIG. 12 is a flowchart showing the content of display control calculation processing of the display control device 42 in the second embodiment. The difference from the flowchart shown in FIG. 6 is that there is no processing of reading prohibition display setting reading (S430), accumulation amount display setting determination (S440), and remaining usable time display setting determination (S470).

  When the operator operates the regeneration prohibition switch 38 (switch ON), the fact that the regeneration is prohibited is additionally displayed, and the PM accumulation amount screen and the remaining usable time are additionally displayed (steps S300 → S310 → S420 → S450 → S480).

  In the first embodiment, regarding the display setting when regeneration is prohibited, in principle, the setting items of “PM accumulation amount display” and “remaining usable time display” are also set to ON, and the second embodiment is substantially The same operation as that of the first embodiment is performed, and the same effect can be obtained.

<Third Embodiment>
In the first embodiment, the third threshold value is the allowable deposition amount, but the second threshold value may be the allowable deposition amount.

  In the PM accumulation amount screen of the third embodiment, the number corresponding to the allowable accumulation amount corresponding to the second threshold is white, and the number corresponding to the accumulation amount estimated based on the pressure loss by the differential pressure detection device 36. Is displayed on a black background. The difference between the third threshold value as the allowable deposition amount in the first embodiment and the second threshold value as the allowable deposition amount in the third embodiment is a safety allowance in consideration of an increase in the deposition amount during movement.

  The operator sees the PM accumulation amount screen, grasps the PM accumulation amount, makes an appropriate work plan, and corrects the work plan as needed. When the accumulation amount approaches the allowable accumulation amount, specifically, all the white background indicators are filled with the black background indicators, or before that, the work is finished or interrupted and the hydraulic excavator is moved to a recyclable place. To ensure safety, manually regenerate the filter.

  However, there are cases where it is necessary to move to a recyclable place over a long distance, such as work at a tunnel site. Further PM accumulates while the excavator is moved to a recyclable location. If the allowable deposition amount is set to the third threshold as in the first embodiment, the PM deposition amount may exceed the third threshold even if the deposition amount is slightly increased. If the PM accumulation amount exceeds the third threshold during the movement, the operator may not be able to manually regenerate and the hydraulic excavator cannot be moved. In this case, the operator has to ask for maintenance, and the work efficiency further decreases.

  When the allowable deposition amount is the second threshold as in the third embodiment, a safety allowance can be provided in consideration of an increase in the deposition amount during movement. Even if PM is further deposited during the movement, PM is deposited. Before the third threshold value is exceeded, the hydraulic excavator can be moved to a recyclable location and manual regeneration can be performed. Thereby, safety can be maintained.

  The configuration other than the above is the same as the configuration of the first embodiment, the same operation is performed, and the same effect can be obtained.

<Fourth embodiment>
In the first embodiment, the third threshold value is the allowable deposition amount, and in the third embodiment, the second threshold value is the allowable deposition amount. However, the third threshold value or the second threshold value may be selected based on the movement distance mode selection.

  In the first embodiment, when it is necessary to move to a recyclable place for a long distance, the PM accumulation amount may exceed the third threshold during the movement. On the other hand, in the third embodiment, by setting the allowable accumulation amount as the second threshold, before the PM accumulates and exceeds the third threshold, the hydraulic excavator can be moved to a recyclable place to perform manual regeneration. it can. However, if the allowable deposition amount is the second threshold, the allowable deposition amount is reached earlier than the allowable deposition amount is the third threshold, and the workable time is shortened. In the case of indoor wood chip transportation work etc., it is only necessary to move it outdoors and perform manual regeneration. When long distance movement to a recyclable place is not required, the effect of the third embodiment is not very significant, but the workable time This shortens the work plan. In the first embodiment, work that could be completed may have to be interrupted.

  FIG. 13 is a flowchart showing the content of display control calculation processing of the display control device 42 in the fourth embodiment. The difference from the flowchart shown in FIG. 6 is that a process of selecting an allowable accumulation amount (S335, S435) is added.

  FIG. 14 is a diagram for explaining the operation of the operator regarding the movement distance mode selection. When the operator presses the menu switch of the operation switch 6b while the basic screen is displayed, the display screen 6a is switched to the menu screen. A plurality of items are displayed on the menu screen. When the operator selects the “exhaust gas filter function” item by operating a function key, the menu screen is switched to a detailed menu screen related to the exhaust gas filter.

  In the detailed menu screen relating to the exhaust gas filter in the fourth embodiment, an item of “movement distance mode selection” is additionally displayed. When the operator selects the “movement distance mode selection” item by operating the function key, the screen switches to the movement distance mode selection screen. In principle, “Nearby mode” is set to be selected, but the “far mode” item can also be selected by operating a function key.

  In the processing of the allowable accumulation amount selection (S335, S435) added in FIG. 13, when the proximity mode is selected on the movement distance mode selection screen, the third threshold is selected, and when the far mode is selected, the second threshold is selected. Select.

  When no long distance movement is required to a recyclable place, if no operation is performed, the proximity mode is selected, and the third threshold is selected as the allowable accumulation amount. When the allowable accumulation amount is the third threshold value, the workable time is longer than when the allowable accumulation amount is the second threshold value, and a work plan can be made without any limitation. The operator grasps the PM accumulation amount by looking at the PM accumulation amount screen, and when the accumulation amount approaches the allowable accumulation amount, the operator finishes or interrupts the operation and moves the hydraulic excavator to a recyclable place to ensure safety and filter. Play manually. At this time, since it is not necessary to move to a recyclable place for a long distance, the accumulation amount increases only slightly, and there is little possibility that the PM accumulation amount exceeds the third threshold.

  When it is necessary to move to a reproducible place for a long distance, the second threshold is selected as the allowable accumulation amount when the distant mode is selected on the movement distance mode selection screen. If the allowable deposition amount is the second threshold value, a safety allowance can be provided in consideration of an increase in the deposition amount during movement. Even if PM is further deposited during the movement, the PM is deposited and exceeds the third threshold value. In addition, the hydraulic excavator can be moved to a recyclable place for manual regeneration. Thereby, safety can be maintained.

  As described above, in the fourth embodiment, by selecting the third threshold value or the second threshold value as the allowable accumulation amount based on the movement distance mode selection, it is possible to make an appropriate work plan while maintaining safety. .

  In the fourth embodiment, the third threshold value or the second threshold value is selected based on the selection of the movement distance mode, but an arbitrary value between the third threshold value and the second threshold value is selected based on the movement distance. You may choose.

DESCRIPTION OF SYMBOLS 1 Diesel engine 1a Electronic governor 2 Engine control dial 3 Rotation speed detection device 4 Control device 5 Key switch 6 Display device 6a Display screen 6b Operation switch 30 Exhaust gas purification system 31 Exhaust pipe 32 Filter 33 Oxidation catalyst 34 DPF device 35 Exhaust temperature detection Device 36 differential pressure detection device 37 regeneration start switch 38 regeneration prohibition switch 39 regeneration fuel injection device 41 vehicle body control device 41a regeneration determination unit 42 display control device 42a basic display unit 42b regeneration prohibition display unit 42c first accumulation amount display unit 42d first 2 Deposition amount display part 42e Remaining usable time display part 43 Engine control device 100 Lower traveling body 101 Upper turning body 102 Front work machines 104a, 104b Traveling motor 105 Turning motor 106 Engine room 107, 107B Driver's cab 108 Driver's seat 11 Boom 112 arm 113 bucket 114 boom cylinder 115 arm cylinder 116 bucket cylinder

Claims (5)

A diesel engine,
A filter disposed in the exhaust system of the engine for collecting particulate matter contained in the exhaust gas;
Regenerating means for regenerating the filter by burning and removing particulate matter deposited on the filter by fuel injection from the engine;
A deposition amount estimating means for estimating a deposition amount of particulate matter deposited on the filter based on the pressure loss of the filter;
A reproduction start instruction means for instructing an operation start of the reproduction means;
Reproduction prohibition instruction means for instructing prohibition of operation of the reproduction means;
When the accumulation amount estimated by the accumulation amount estimation means exceeds a predetermined first threshold value, the automatic regeneration control function for operating the regeneration means, and the accumulation amount estimated by the accumulation amount estimation means exceeds the predetermined second threshold value. Then, a warning signal that prompts the operation of the regeneration start instructing means is output, and when the regeneration start instructing means is operated, the regeneration means is operated, and the regeneration prohibition is performed while the regeneration means is inactive. When the instruction means is operated, the automatic regeneration control function and the manual action generation control function are disabled so that the operation of the reproduction means is prohibited, and the operation of the reproduction means is prohibited. the reproduction inhibition instructing means reproducing controller having and an engineered reproduction inhibition control function for prohibiting the operation of said reproducing means by stopping the operation of said reproducing means when the in Disposed cab of the working machine mounting the exhaust gas purification system provided with,
A display screen;
In a display device for a work implement comprising a display control device having a basic display function for displaying basic information related to the work implement on the display screen,
The display control device, said when reproduction inhibition instructing means is operation operation of said reproducing means is prohibited, and the reproduction inhibition display function in which the reproducing means displays that are in reproduction inhibition state, the reproduction inhibition instruction when the unit is prohibited operation of the regeneration means is operated, the first deposition amount display function the accumulation amount estimating means with a predetermined allowable deposition amount larger than the first threshold value to display the deposit amount estimated, wherein when the operation of the reproduction inhibition instructing means is the operation wherein the reproducing means is prohibited, the rest use the deposit amount estimating means with a predetermined allowable deposition amount larger than the first threshold value based on the accumulated amount of log estimated A display device for a working machine having a remaining usable time display function for displaying a possible time. The display device for a work machine according to claim 1,
The display device for a working machine, wherein the predetermined allowable accumulation amount that is larger than the first threshold value displayed by the display control device is a third threshold value that is an upper limit value that can be manually regenerated by the operation of the regeneration start instruction means. The display device for a work machine according to claim 1,
The display device for a working machine, wherein the predetermined allowable accumulation amount greater than the first threshold value displayed by the display control device is a second threshold value. The display device for a work machine according to claim 1,
Furthermore, a display device operation unit,
A moving distance mode selection means for selecting either the near mode or the far mode by the operation of the display device operation unit;
The display control device has an allowable accumulation amount selection function of selecting a second threshold value as an allowable accumulation amount or a third threshold value that is an upper limit value that can be manually regenerated by the operation of the regeneration start instruction unit,
The display device for a working machine, wherein the allowable accumulation amount selection function selects a third threshold value when a proximity mode is selected, and selects a second threshold value when a distant mode is selected. The display device for a work machine according to claim 1,
Furthermore, a display device operation unit is provided,
When the operation of the regeneration means is not prohibited, the display control device selectively deposits estimated by the deposition amount estimation means with a predetermined allowable deposition amount greater than a first threshold value by operation of the display device operation unit. A display device for a working machine having a second accumulation amount display function for displaying the amount.

Images