JP2010203297A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working machine which can restrain generation of clogging of a filter caused by the discontinuance of forced regeneration. <P>SOLUTION: The working machine provided with an exhaust air purification system 4 which regenerates the filter 6 that collects PM within the exhaust air of a diesel engine 1 is provided with a differential pressure sensor 8 which detects the differential pressure at a mouth of the filter, a key signal input section 38 which detects whether an engine is operated or not, an exhaust air temperature sensor 7 which detects the temperature of the exhaust air from the engine, a regeneration starting signal input section 34 which detects that the forced regeneration of the filter has started, a regeneration determining section 36 which determines that the forced regeneration has failed in case the starting of the forced regeneration is confirmed and the differential pressure of the filter is retained higher than a regeneration completion pressure P when the key signal input section detects that the engine has stopped or when the exhaust air temperature reaches less than a regeneration capable temperature T, and a display device 12 which displays that the regeneration determining section has determined that the forced regeneration has failed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a work machine including a diesel engine.

  An exhaust purification device that removes particulate matter (Particulate Matter (hereinafter referred to as PM)) from exhaust gas of a diesel engine includes a diesel particulate filter (hereinafter referred to as DPF or filter). There is something to prepare. When exhaust gas is passed through this filter, PM is collected and can be removed from the exhaust gas.

  When the exhaust temperature is maintained above the activation temperature (about 350 ° C.) of the filter catalyst for a predetermined time (for example, several minutes), the collected PM burns and the filter is regenerated (self-regenerated). When the exhaust gas temperature does not reach the activation temperature, or when the exhaust gas temperature has fallen without completing regeneration, PM is accumulated in the filter. If PM continues to accumulate, the filter will be clogged, leading to an increase in exhaust pressure.

  As a filter regeneration method for avoiding such a situation, forced regeneration that removes PM by burning unburned fuel included in exhaust by post injection or multi-injection and forcibly raising the exhaust temperature is performed. is there. In forced regeneration, (1) a method of automatically performing regeneration when a certain condition is satisfied (for example, when the estimated amount of PM exceeds a threshold value and the catalyst bed temperature is within a predetermined temperature range) ( (Automatic regeneration) (see Patent Document 1) and (2) A method of performing regeneration at an arbitrary timing by the driver's operation (Manual regeneration) (see Patent Document 2).

JP 2003-155916 A JP 2005-155444 A

  By the way, work machines such as hydraulic excavators generally have a high frequency of engine stop unlike ordinary vehicles such as automobiles that have a long engine operation time, and the engine speed varies depending on the work content and work load. Is big. For this reason, it is difficult to maintain the exhaust gas temperature above the activation temperature only by normal operation, and the role of forced regeneration is more important than self-regeneration from the viewpoint of preventing clogging of the filter.

  However, in a work machine, even if forced regeneration is executed automatically or manually, there is a high possibility that regeneration will be interrupted because of the above engine stop or the like, and PM accumulates even though forced regeneration is being performed. The tendency to do is strong. In addition, a work machine is often rented to a customer from a management company (for example, a rental company), and there are many opportunities to be used by those who are unfamiliar with maintenance management or who are not active in maintenance management. Therefore, it can be pointed out that interruption of forced regeneration is highly likely to cause clogging of the filter.

  An object of the present invention is to provide a work machine that can suppress the occurrence of clogging of a filter due to interruption of forced regeneration.

  (1) In order to achieve the above object, the present invention collects particulate matter in the exhaust of a diesel engine with a filter, burns the collected particulate matter, and regenerates the filter. In a work machine including the apparatus, a differential pressure detection unit that detects a differential pressure at an inlet / outlet of the filter, an engine state detection unit that detects whether the diesel engine is operating, and an exhaust temperature from the diesel engine. An exhaust temperature detecting means for detecting, a regeneration detecting means for detecting that the forced regeneration of the filter has started, and a case where the start of forced regeneration is confirmed in the regeneration detecting means, wherein the differential pressure detecting means When the detected differential pressure is kept higher than a threshold value indicating completion of regeneration, the engine state detecting means detects the stop of the diesel engine. Or when the exhaust temperature detected by the exhaust temperature detection means has reached a threshold value indicating that regeneration is possible, the regeneration determination means for determining that forced regeneration has failed, and the regeneration determination means has failed for forced regeneration. And a notification means for notifying that the forced regeneration has failed.

  (2) In the above (1), it is preferable that the reproduction determination unit further includes a reproduction failure number storage unit that stores the number of times that the forced reproduction is determined to have failed, and the notification unit includes the reproduction failure number storage unit. When the number of times stored in the above reaches a threshold value indicating the notification timing, it is notified that the forced regeneration has failed.

  (3) In the above (2), preferably, the accumulated amount of particulate matter in the filter is estimated based on the differential pressure detected by the differential pressure detecting means when the diesel engine is started, and the estimated accumulated amount is Further comprising notification timing setting means for setting a threshold value indicating the notification timing based on the number of times stored in the reproduction failure number storage means reaching a threshold value set by the notification timing setting means. In some cases, it is notified that forced regeneration has failed.

  (4) In the above (2) or (3), preferably, the regeneration failure frequency storage means stores when the differential pressure detected by the differential pressure detection means reaches a threshold value indicating completion of regeneration. It is assumed that the number of times is zero.

  (5) In any one of the above (1) to (4), preferably, the notification unit displays that the forced regeneration has failed, and forcibly indicates the reason why the regeneration determination unit has determined that the forced regeneration has failed. It is assumed that the display means displays the reason why reproduction has failed.

  (6) In the above (5), preferably, the regeneration failure number storage means stores the number of times for each reason that the regeneration determination means determines that the forced regeneration has failed, and the display means performs the forced regeneration. The number of times for each reason determined to have failed is further displayed.

  (7) In any of the above (1) to (6), preferably, when the regeneration determination unit determines that the forced regeneration has failed, it is determined that the forced regeneration has failed, and the regeneration determination unit has failed. It is assumed that the information processing apparatus further includes communication means for transmitting the reason for the above and the position information of the work machine as data to a management terminal installed in a remote place.

  According to the present invention, since it is possible to notify the user of the work machine that the forced regeneration process has been interrupted, it is possible to suppress the occurrence of clogging of the filter due to the suspension of the forced regeneration.

The schematic block diagram of the working machine which is embodiment of this invention. The block diagram of the reproduction | regeneration monitoring controller 21. FIG. The 1st forced regeneration monitoring flowchart in the working machine which concerns on this Embodiment. The 2nd forced regeneration monitoring flowchart in the working machine which concerns on this Embodiment. The 3rd forced regeneration monitoring flowchart in the working machine which concerns on this Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a work machine according to an embodiment of the present invention.

  The work machine shown in this figure includes a diesel engine 1, an exhaust purification device 4, a control device (engine controller 9 and regeneration monitoring controller 21), a display device 12, a manual regeneration operation device 23, and a communication device 11. I have.

  The diesel engine 1 obtains power by compressing the air in the combustion chamber (cylinder) 1a with the piston 1b to a high temperature, and supplying the fuel to the compressed air via the fuel injection device 2 to cause spontaneous ignition. . Exhaust gas from the combustion chamber 1a is introduced into the exhaust purification device 4 via an exhaust pipe 3 connected to the combustion chamber 1a.

  The exhaust purification device 4 includes an oxidation catalyst 5 and a filter with a catalyst (DPF) 6. The exhaust gas from the diesel engine 1 is collected by the filter 6 to purify the exhaust.

  The oxidation catalyst 5 reacts with unburned fuel contained in the exhaust during forced regeneration to raise the exhaust temperature, and is installed upstream in the exhaust gas flow direction in the exhaust purification device 4. Exhaust temperature sensors (exhaust temperature detecting means) 7 a and 7 b for detecting the exhaust temperature are attached to the exhaust catalyst inlet side and the outlet side of the oxidation catalyst 5. The temperature sensor 7a on the inlet side of the oxidation catalyst 5 detects the temperature of the exhaust gas flowing into the oxidation catalyst 5, and the temperature sensor 7b on the outlet side of the oxidation catalyst 5 detects the temperature of the exhaust gas flowing into the filter 6. is there. The exhaust temperature detected by the exhaust temperature sensors 7a and 7b is output to the engine controller 9, the regeneration monitoring controller 21 and the like.

  The filter 6 collects PM in the exhaust gas, and is installed on the downstream side in the exhaust gas flow direction in the exhaust gas purification device 4 (that is, on the downstream side of the oxidation catalyst 5). The PM collected by the filter 6 can be burned and removed by passing the exhaust gas maintained at a temperature higher than the activation temperature of the catalyst of the filter 6.

  Further, a differential pressure sensor (differential pressure detecting means) 8 for detecting the differential pressure at the inlet / outlet of the filter 6 is attached to the filter 6. The differential pressure detected by the differential pressure sensor 8 is output to the engine controller 9, the regeneration monitoring controller 21 and the like, and is used for estimating the PM accumulation amount of the filter 6, determining the start timing of automatic regeneration, and the like.

  The engine controller 9 receives a key signal 13 from a key cylinder (not shown) into which an engine key is inserted. The engine controller 9 starts the engine when receiving an engine start signal (key ON signal) from the key cylinder, and stops the engine when receiving an engine stop signal (key OFF signal).

  The engine controller 9 is also used for controlling forced regeneration of the filter 6. As a method of forced regeneration, first, when the differential pressure of the filter 6 inputted from the differential pressure sensor 8 reaches a threshold value (automatic regeneration start pressure) set for starting forced regeneration, the regeneration of the filter 6 is performed. There is “automatic playback” that is automatically performed. When the differential pressure of the filter 6 reaches the automatic regeneration start pressure, the engine controller 9 during automatic regeneration controls the fuel injection device 2 to change the fuel injection timing (post injection, multi-injection) and raise the exhaust temperature. Let For example, when unburned fuel is included in the exhaust by post injection, the unburned fuel in the exhaust is oxidized by the oxidation catalyst 5 and the temperature of the exhaust flowing into the filter 6 is raised. When the exhaust gas temperature is forcibly increased in this way, the PM deposited on the filter 6 can be burned, so that the filter 6 can be regenerated.

  As another forced regeneration method, there is “manual regeneration” in which the filter 6 is regenerated at an arbitrary timing based on the operation of the operator of the work machine. The manual regeneration in the present embodiment is performed based on a manual regeneration start signal from a manual regeneration operating device 23 connected to the engine controller 9 via the CAN 10. As a specific example of the manual regeneration operating device 23, for example, there is a manual regeneration button installed in the driver's seat of the work machine. When the manual regeneration button is pushed by the driver, the engine controller 9 regenerates the filter 6 by changing the fuel injection timing to raise the exhaust gas temperature in the same manner as the automatic regeneration described above. In the present embodiment, when the engine controller 9 starts forced regeneration (automatic regeneration and manual regeneration), a forced regeneration start signal is output to the regeneration monitoring controller 21 via the CAN 10.

  The regeneration monitoring controller 21 determines whether or not forced regeneration is interrupted before the regeneration of the filter 6 is completed, and transmits data to the display device 12 and the management terminal 16 when forced regeneration fails. , CAN10. In the following, the fact that the forced regeneration is interrupted before the regeneration of the filter 6 is completed may be referred to as “forced regeneration failure”.

Here, the reproduction monitoring controller 21 will be described in detail.
FIG. 2 is a configuration diagram of the reproduction monitoring controller 21. In this figure, the regeneration monitoring controller 21 includes a CAN data input unit 31, a differential pressure sensor value input unit 32, an exhaust temperature sensor value input unit 33, a regeneration start signal input unit 34, a notification timing setting unit (notification timing). Setting means) 35, a regeneration determination section (reproduction determination means) 36, a regeneration time measurement section (regeneration time measurement means) 37, a key signal input section (engine state detection means) 38, and an outside air temperature sensor value input section 39. A reproduction failure number storage unit (reproduction failure number storage unit) 40, a reproduction failure state storage unit (reproduction failure state storage unit) 41, and a CAN data output unit 42.

  The CAN data input unit 31 is a part to which data is input from another terminal via the CAN 10. In the present embodiment, for example, the differential pressure sensor value from the differential pressure sensor 8 and the exhaust temperature sensor 7 The exhaust temperature sensor value and the forced regeneration start signal from the engine controller 9 are input.

  The differential pressure sensor value input unit 32 is a part to which the differential pressure sensor value from the differential pressure sensor 8 is input, and outputs the input differential pressure sensor value to the notification timing setting unit 35 and the regeneration determination unit 36. . The exhaust temperature sensor value input unit 33 is a part to which the exhaust temperature sensor values from the exhaust temperature sensors 7 a and 7 b are input, and outputs the input exhaust temperature sensor value to the regeneration determination unit 36. The regeneration start signal input unit 34 is a portion to which a forced regeneration start signal is input from the engine controller 9, and outputs the input forced regeneration start signal to the regeneration determination unit 36 and the regeneration time measurement unit 37.

  The key signal input unit 38 is a part to which the key signal 13 is input from a key cylinder (not shown), and detects whether or not the diesel engine 1 is operating based on the key signal 13. That is, in the present embodiment, it is determined that the diesel engine 1 is operating when the key signal 13 is the key ON signal, and it is determined that the diesel engine 1 is stopped when the key signal 13 is the key OFF signal. The key signal 13 input to the key signal input unit 38 is output to the notification timing setting unit 35 and the reproduction determination unit 36. In the present embodiment, the case where the key signal input unit 38 that detects the operation of the engine based on the key signal 13 is used as the engine state detection means will be described. Instead, the alternator driven by the engine is used. What detects the operation of the engine based on the voltage (not shown) and the output of the engine speed may be used as the engine state detection means.

  The outside air temperature sensor value input unit 39 is a part to which the outside air temperature sensor value is inputted from the outside air temperature sensor 22, and outputs the inputted outside air temperature sensor value to the regeneration determination unit 36 and the like. In this embodiment, the key signal 13 and the outside air temperature sensor value are input to the regeneration determination unit 36 via the key signal input unit 38 and the outside air temperature sensor value input unit 39. Of course, it may be input to the reproduction determination unit 36 via 31 (that is, CAN 10).

  The notification timing setting unit 35 is a part for setting a threshold value (notification timing number N) indicating a timing for transmitting data to the display device 12 and the communication device 11. When the start of the diesel engine 1 is confirmed by inputting a key ON signal from the key signal input unit 38, the notification timing setting unit 35 first detects the differential pressure detected by the differential pressure sensor 8 when the diesel engine 1 is started. Based on the above, the PM accumulation amount in the filter 6 is estimated. In order to acquire the differential pressure of the filter 6, the differential pressure sensor value input from the differential pressure sensor value input unit 32 when the key ON signal is input is used. When the PM accumulation amount (estimated accumulation amount) is estimated, the notification timing setting unit 35 sets the number of forced regeneration failures that becomes the notification timing number N based on the PM accumulation amount.

  Here, as a specific example of the method for setting the number N of notification timings, when the differential pressure of the filter 6 at the time of engine start is small, the threshold value is set large to delay the notification timing, and conversely when the differential pressure is large, the threshold value is set. There is a method of increasing the notification timing by setting a smaller value. When the threshold is set in this way, the driver or the like can be notified only when the necessity for regeneration of the filter 6 is high, and the manual regeneration is performed when the necessity for regeneration is low, and the work is prevented from being interrupted. Or the amount of data passing through the system can be reduced.

  The reproduction time measuring unit 37 is a part that measures an elapsed time (reproduction time) from the time when the forced reproduction is started by the engine controller 9. In the present embodiment, the timing at which the reproduction time measurement is started is the time when the forced reproduction start signal is input from the reproduction start signal input unit 34. In addition, the timing at which the measurement of the reproduction time ends is (1) the time when the reproduction determination unit 36 determines that the forced reproduction is completed (described later), or (2) the reproduction determination unit 36 determines that the forced reproduction has failed. Time (described later). That is, the reproduction time measuring unit 37 measures the time from the start of forced regeneration to the completion, or the time until it is determined that the reproduction has failed. The reproduction time measured by the reproduction time measurement unit 37 is output to the reproduction determination unit 36 one by one, and is used for determining whether forced reproduction has failed as will be described later.

  The regeneration determination unit 36 is a part that determines whether forced regeneration has been completed or has failed, and includes a differential pressure sensor value input unit 32, an exhaust temperature sensor value input unit 33, a regeneration start signal input unit 34, and a notification timing setting unit. 35, a regeneration determination unit 36, a regeneration time measurement unit 37, a key signal input unit 38, an outside air temperature sensor value input unit 39, a regeneration failure number storage unit 40, a regeneration failure state storage unit 41, and a CAN data output unit 42. Yes.

  The regeneration determination unit 36 according to the present embodiment is based on four indicators: (1) differential pressure at the inlet / outlet of the filter 6, (2) operating condition of the diesel engine 1, (3) exhaust temperature, and (4) regeneration time. Whether or not forced regeneration is complete.

  Of the above four indicators, “(1) differential pressure at the inlet / outlet of the filter 6” is used to determine that the forced regeneration has been completed. That is, the regeneration determination unit 36 determines that the regeneration of the filter 6 has been completed when the differential pressure sensor value from the differential pressure sensor value input unit 32 has reached a threshold value (regeneration completion pressure P) indicating completion of regeneration. In other words, the regeneration determination unit 36 determines that the forced regeneration is being performed while the differential pressure sensor value is held higher than the regeneration completion pressure P after the forced regeneration is started. When it is determined that the forced regeneration has been completed, the regeneration determination unit 36 outputs a regeneration completion signal indicating that the regeneration has been completed to the regeneration failure number storage unit 40.

  On the other hand, “(2) Operation status of diesel engine 1”, “(3) Exhaust temperature” and “(4) Regeneration time” are used to determine that the forced regeneration has failed. First, during the forced regeneration, when it is detected that the key signal 13 from the key signal input unit 38 changes from the key ON signal to the key OFF signal and the diesel engine 1 is stopped, it is determined that the forced regeneration has failed. To do. Second, when the exhaust temperature sensor value (sensor value of the exhaust temperature sensor 7b) from the exhaust temperature sensor value input unit 33 reaches less than a threshold (renewable temperature T) indicating that regeneration is possible during forced regeneration. It is determined that forced regeneration has failed. At this time, the reproducible temperature T may be determined based on the sensor value of the exhaust temperature sensor 7a. Third, it may be determined that the forced regeneration has failed when the reproduction time input from the reproduction time measuring unit 37 reaches a threshold (maximum reproduction time M) or more. As the maximum reproduction time M, it is preferable to adopt a time (for example, 30 minutes) at which reproduction should be sufficiently completed under normal conditions. If the maximum regeneration time M is set in this way, it can be determined that regeneration has failed due to other reasons even when there is no abnormality in the operation state and exhaust temperature of the diesel engine 1. If it is determined that the forced regeneration has failed due to the above-described index, the reproduction determination unit 36 outputs a reproduction failure signal indicating that the reproduction has failed to the reproduction failure number storage unit 40 and the reproduction failure state storage unit 41, and outputs CAN data. The data is output to the display device 12 and the communication device 14 via the unit 42.

  The reproduction failure number storage unit 40 is a part that stores the number of times that the reproduction determination unit 36 has determined that the forced reproduction has failed (the number of reproduction failures). When the reproduction failure signal output from the reproduction determination unit 36 is received, the reproduction failure number storage unit 40 increases (increments) the reproduction failure number by one each time. On the other hand, when the regeneration failure number storage unit 40 receives the regeneration completion signal (that is, when the sensor value detected by the differential pressure sensor value input unit 32 reaches the regeneration completion pressure P or less), the regeneration failure stored therein is stored. Reset the count to zero (clear to zero). Note that even after the number of regeneration failures is cleared to zero, the number of regeneration failures after the filter 6 replacement (cumulative failure count) may be stored separately. When the cumulative failure count is stored in this manner, the cumulative failure count may be cleared to zero when the filter 6 is replaced. In addition, the number of times of reproduction failure (described later) for each reason why reproduction failed may be stored separately.

  The regeneration failure state storage unit 41 is a part that stores data (state data) relating to the state of the work machine when the regeneration determination unit 36 determines that the forced regeneration has failed. The regeneration failure state storage unit 41 includes an outside air temperature sensor 22, a key cylinder, exhaust temperature sensors 7a and 7b, an engine controller 9, a differential pressure sensor 8, a position measuring device 14 (described later), a regeneration time measuring unit 37, and a regeneration determining unit. 36, data from the reproduction failure number storage unit 40, and the like are transmitted. And the data transmitted from each part in this way are stored as state data. The state data stored in the regeneration failure state storage unit 41 includes, for example, the date and time when it is determined that the forced regeneration has failed, the outside temperature transmitted from the outside temperature sensor 22 at that time, and the key transmitted from the key cylinder. State of signal 13, exhaust temperature transmitted from exhaust temperature sensors 7 a and 7 b, engine speed transmitted from engine controller 9, differential pressure of filter 6 transmitted from differential pressure sensor 8, transmitted from position measuring device 14 Position information (measured by the position measuring device 14 described later), the reproduction time transmitted from the reproduction time measurement unit 37, and the reason why the reproduction transmitted from the reproduction determination unit 36 failed (above (2) to (4 ), Which index is determined to have failed).

  As described above, when various types of state data at the time of reproduction failure are stored, the state data is transmitted to the display device 12 for display, or the state data is transmitted to the management terminal 16 for storage. Accordingly, it is possible to confirm the status data when the reproduction fails after the reproduction failure.

  Returning to FIG. 1, the display device (notification unit) 12 displays a warning message indicating that the forced regeneration has failed when the regeneration determination unit 36 determines that the forced regeneration has failed (for example, “Forced regeneration has failed. Press the manual regeneration button to perform manual regeneration. ”) Is displayed and informs the operator of the work machine. The display device 12 is attached to a position in the driver's seat where it can be easily seen by the driver, and is connected to the CAN 10. When the reproduction failure signal is received from the reproduction determination unit 36 via the CAN 10, the display device 12 displays a warning message. In the present embodiment, a case has been described in which a warning message indicating that the forced regeneration has failed is displayed on the display device 12, but this fact may be notified by a graphic such as a warning icon. Further, instead of the display device 12, for example, a warning sound or a warning light may be used as the notification means.

  The position measuring device (position measuring means) 14 measures the current position of the work machine and is connected to the CAN 10. As a position measurement method, for example, there is a GPS (Global Positioning System) using a plurality of satellites. The position information of the work machine measured by the position measuring device 14 is output to the regeneration failure state storage unit 41 or the like via the CAN 10.

  When the regeneration determination unit 36 determines that the forced regeneration has failed, the communication device (communication means) 11 is a management side (for example, a manufacturer in the case of renting a work machine) in the remote base station. A forced regeneration failure signal is transmitted as data to the terminal (management terminal) 16 and is connected to the CAN 10. The communication device 11 in the present embodiment is a portable communication device, and data from the communication device 11 is transmitted to the management terminal 16 via the communication antenna 15, but in addition, infrared communication, Bluetooth, satellite Of course, a communication device using communication or the Internet may be used. The management terminal 16 can simultaneously check a list of work machines for which warning messages are displayed on the display device 12. In addition, as other data to be transmitted to the management terminal 16, the state data stored in the reproduction failure state storage unit 41 may be transmitted.

  Next, a first monitoring flow in the regeneration monitoring controller 21 of the work machine configured as described above will be described.

  FIG. 3 is a first forced regeneration monitoring flowchart in the work machine according to the present embodiment.

  As shown in this figure, when the regeneration determination unit 36 receives the forced regeneration start signal from the regeneration start signal input unit 34 and confirms the start of forced regeneration, it starts the forced regeneration monitoring control (S101). First, the regeneration determination unit 36 determines whether or not the differential pressure sensor value (the differential pressure of the filter 6) from the differential pressure sensor value input unit 32 is held higher than the regeneration completion pressure P (S102). If the differential pressure sensor value is held higher than the regeneration completion pressure P, it is determined whether or not the key signal 13 from the key signal input unit 38 is a key OFF signal (S103). If the key signal 13 is the key OFF signal in S103, it is determined that the regeneration has failed because the diesel engine 1 has stopped before the regeneration is completed, and the regeneration determining unit 36 displays a regeneration failure signal. Transmit to device 12. Receiving the regeneration failure signal, the display device 12 displays a warning message indicating that the forced regeneration has failed, notifies the driver to that effect, and prompts the driver to perform manual regeneration (S106).

  On the other hand, if the key signal 13 remains the key ON signal in S103, the regeneration determination unit 36 determines whether or not the exhaust temperature sensor value from the exhaust temperature sensor value input unit 33 has reached less than the reproducible temperature T. Is determined (S104). Here, if the exhaust temperature sensor value has reached less than the reproducible temperature T, it is determined that the regeneration has failed because the exhaust temperature has decreased before the regeneration is completed, and the regeneration determination unit 36 generates a regeneration failure signal. The information is transmitted to the display device 12, and the driver is notified of the fact (S106).

  In S104, if the exhaust temperature sensor value is equal to or higher than the reproducible temperature T, the regeneration determination unit 36 determines whether the regeneration time transmitted from the regeneration time measurement unit 37 has reached the maximum regeneration time M or more ( S105). Here, if the regeneration time has reached the maximum regeneration time M or more, it is determined that the regeneration has failed for reasons other than the stop of the diesel engine 1 or a decrease in the exhaust temperature, and the regeneration determination unit 36 displays a regeneration failure signal. The information is transmitted to the device 12, and the driver is notified of the fact (S106). On the other hand, if the playback time is less than the maximum playback time M in S105, the process returns to S102 and the above processes are repeated.

  By the way, when the differential pressure sensor value reaches the regeneration completion pressure P or less in S102 of the above process, the regeneration determination unit 36 determines that the regeneration of the filter 6 is completed and ends the monitoring flow (S107). In the above description, the regeneration failure is determined using the three indicators of the key signal 13 (S103), the exhaust gas temperature sensor value (S104), and the regeneration time (S105), but at least one of these indicators is used. To do so.

  If the monitoring flow is configured as described above, it is possible to notify the user of the work machine (mainly the driver) that the forced regeneration has been interrupted, so the driver can be prompted to perform manual regeneration, The occurrence of clogging of the filter due to the forced regeneration interruption can be suppressed.

  In S106 described above, the “reason for failure of reproduction” stored in the reproduction failure state storage unit 41 is transmitted to the display device 12 together with the reproduction failure signal, and the display device 12 is accompanied with a warning message that the forced reproduction has failed. May be displayed. In this case, for example, when it is determined that the forced regeneration has failed due to a decrease in the exhaust temperature, a message such as “Forced regeneration has failed because the exhaust temperature has decreased” may be displayed. When the reason for failure is displayed in this manner, the driver can be made to recognize the reason for failure, and accordingly, a response corresponding to the reason for failure can be promoted. In addition, when the work machine is rented and the management side visits the site and performs maintenance, refer to the message indicating the reason for failure to ensure the accuracy of avoiding forced regeneration failure. Advice can be provided to users of work machines.

  Further, in S106 described above, the status data stored in the playback failure status storage unit 41 may be transmitted together with the playback failure signal to the display device 12 and displayed together with a warning message that the forced playback has failed. In this way, it is possible to know in detail the state of the work machine at the time when regeneration has failed. For example, in the case where the engine speed and the outside air temperature are displayed on the display device 12 as the state data, the engine speed or the outside air temperature is determined when it is determined that regeneration has failed due to a decrease in the exhaust temperature. By referring to this, it may be possible to investigate the root cause of regeneration failure, such as whether the cause of the decrease in the exhaust temperature is a decrease in the engine speed or the outside air temperature is too low.

  In addition, each state data displayed at the time of the reproduction failure may be appropriately displayed on the display device 12 based on the operation of the driver or the like, and may be referred to after the reproduction failure. With this configuration, it is possible to refer to the history of state data when forced regeneration fails at any time.

  Next, a second monitoring flow in the regeneration monitoring controller 21 of the work machine configured as described above will be described.

  FIG. 4 is a second forced regeneration monitoring flowchart in the work machine according to the present embodiment. In this monitoring flow, (1) the number of reproduction failures is counted and displayed on the display device 12 (S111, 112), and (2) data indicating that reproduction has failed is transmitted to the management terminal 16 of the base station. (S113) is mainly different from the first flow.

  In the monitoring flow shown in FIG. 4, S101 to S105 are the same as the first monitoring flow, and thus description thereof is omitted. Here, if it is determined in S103, S104, S105 that the reproduction determination unit 36 has determined that reproduction has failed, the number of reproduction failures stored in the reproduction failure number storage unit 40 is increased (incremented) by one (S111). . Then, the reproduction determination unit 36 transmits a reproduction failure signal to the display device 12 together with the number of reproduction failures. Receiving these data, the display device 12 displays a warning message indicating that the forced reproduction has failed and the number of reproduction failures (S112). Then, the reproduction determination unit 36 transmits the reason for the reproduction failure acquired from the reproduction failure state storage unit 41, the position information (status data) of the work machine, and the reproduction failure signal to the communication device 11, and communicates these data. It transmits to the management terminal 16 via the apparatus 11 (S113).

  On the other hand, if the differential pressure sensor value reaches the regeneration completion pressure P or less in S102 during the above process, the regeneration failure count stored in the regeneration failure count storage unit 40 is cleared to zero (S114), and the regeneration of the filter 6 is completed. It is determined that the monitoring flow has been completed (S115).

  Even if the monitoring flow is configured as described above, it is possible to notify the user (operator, administrator, etc.) of the work machine that the forced regeneration has been interrupted, so that the driver is encouraged to perform manual regeneration. it can. And according to this monitoring flow, the following effects can be further exhibited.

  That is, when the number of reproduction failures is transmitted to the display device 12 as described above, the number of reproduction failures since the previous reproduction completion can be confirmed. Thereby, for example, when the number of times of display is large, the filter can be easily clogged, so that the user can recognize that early manual regeneration is necessary. In S111 described above, the number of reproduction failures for each reason why the reproduction failed may be stored in the reproduction failure number storage unit 40, and the number of each reason may be transmitted to the display device 12 for display. In this way, the driver can be made aware of the tendency of regeneration failure in the work machine. Further, even after the number of regeneration failures is cleared to zero in S114, the cumulative number of failures after the replacement of the filter 6 may be stored separately. If the cumulative number of failures is stored in this way, it can be used as a guide for the replacement time of the filter 6.

  When the regeneration failure signal is transmitted to the management terminal 16 as described above, the regeneration state of the filter 6 can be monitored on the management side even when the work machine is rented. Further, if the reason why the reproduction has failed is transmitted to the management terminal 16 as described above, the reason why the forced reproduction has failed can be grasped on the management side. As a result, for example, the usage tendency of the operator of the work machine and the usage site can be grasped for the reason that the regeneration has failed, and thus the advice corresponding to the usage tendency can be provided to the user of the work machine. Further, if the position information of the work machine at the time of regeneration failure is transmitted as described above, it is possible to determine a tour route with less waste when traveling and maintaining scattered work machines (for example, frequent regeneration is performed). If the locations of failed machines are concentrated, a route that can be visited once can be planned). Furthermore, it goes without saying that if status data other than those described above is transmitted, the status of the work machine can be grasped in detail.

  Next, a third monitoring flow in the regeneration monitoring controller 21 of the work machine configured as described above will be described.

  FIG. 5 is a third forced regeneration monitoring flowchart in the work machine according to the present embodiment. In this monitoring flow, (1) data is transmitted to the display device 12 or the like only after the number of regeneration failures reaches a threshold (notification timing number N) (S124), and (2) the threshold of the number of regeneration failures is set when the engine is started. The point (S120-122) that is set based on the amount of accumulated PM is mainly different from the second flow. In the monitoring flow of this figure, S102 to S105 and S111 to S115 are the same as the previous monitoring flow, and thus description thereof is omitted.

  In FIG. 5, first, the notification timing setting unit 35 in the regeneration monitoring controller 21 confirms the start of the diesel engine 1 by the key ON signal (S120), and then the differential pressure detected by the differential pressure sensor 8 when the diesel engine 1 is started. Based on the above, the PM accumulation amount in the filter 6 is estimated (S121). Next, the notification timing setting unit 35 sets the notification timing number N based on the PM accumulation amount (estimated accumulation amount) estimated in S121, and transmits the notification timing number N to the regeneration determination unit 36 (S122).

  When the notification timing number N is set, the regeneration determination unit 36 stands by until forced regeneration is started. Thereafter, when a playback start signal is input from the playback start signal input unit 34, the playback determination unit 36 determines that forced playback has started, and proceeds to the processing after S102 (S123).

  The regeneration determination unit 36 monitors the differential pressure of the filter 6 in the same manner as in the previous monitoring flow (S102), and regeneration fails based on the key OFF (S103), the exhaust temperature (S104), and the regeneration time (S105). If it is determined that the reproduction has failed, the number of reproduction failures is increased by 1 (S111). Next, the reproduction determination unit 36 compares the number of failures stored in the reproduction failure number storage unit 40 with the number N of notification timings (S124). If the number of failures is less than the notification timing number N, the process returns to S123 and waits until forced regeneration is started. On the contrary, when the number of failures reaches the notification timing number N or more, the display device 12 displays that the reproduction has failed (S112), and transmits data to the management terminal 16 (S113).

  Similarly to the previous flow, when the differential pressure sensor value reaches the regeneration completion pressure P or less in S102, the regeneration failure count stored in the regeneration failure count storage section 40 is cleared to zero (S114), and the filter 6 is regenerated. It is determined that the monitoring has been completed, and the monitoring flow ends (S115).

  In the above flow, the notification timing number N is set based on the PM accumulation amount at the time of engine start in S121 and S122. However, the notification timing number N may be set to an arbitrary integer unrelated to the PM accumulation amount. good.

  Even if the monitoring flow is configured as described above, it is possible to notify the driver of the work machine that the forced regeneration has been interrupted, so that the driver can be prompted to perform manual regeneration. And according to this monitoring flow, the following effects can be further exhibited.

  That is, when data is transmitted to the display device 12 after waiting until the number of reproduction failures reaches the notification timing number N as described above, the timing of notification to the driver and the management terminal 16 can be artificially adjusted. . As a case where the work machine configured in this way is useful, for example, there may be frequent regeneration failures that do not significantly affect the clogging of the filter 6 due to the usage form of the work machine. In this case, the fact that the regeneration has failed is frequently displayed. If the display is frequently performed in this way, the driver misunderstands that the regeneration monitoring controller 21 or the display device 12 is out of order and the manual regeneration is performed. There is also a risk of becoming sparse. However, if the number N of notification timings is set in advance in such a case, the timing of notification timing can be increased, thereby reducing the possibility of misunderstanding by the driver. Further, when data is transmitted to a remote place like the management terminal 16 and the bandwidth of the communication path is narrow or the transmission path capacity is low, the load applied to the network can be reduced. it can.

  Further, if the number N of notification timings is set based on the PM accumulation amount as described above, the driver can be notified only when the necessity for regeneration of the filter 6 is high, and the necessity for regeneration is low. Thus, it is possible to suppress the interruption of the work by performing manual regeneration, and to reduce the amount of data passing through the system. In the above description, the notification timing number N is set based on the PM accumulation amount. However, the notification timing number N is set based on the cumulative failure number since the filter 6 is replaced, the accumulated usage time since the filter 6 is replaced, or the like. However, the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1 Diesel engine 2 Fuel injection apparatus 3 Exhaust pipe 4 Exhaust gas purification apparatus 5 Oxidation catalyst 6 Filter 7 Exhaust temperature sensor 8 Differential pressure sensor 9 Engine controller 11 Communication apparatus 12 Display apparatus 13 Key signal 14 Position measuring apparatus 16 Management terminal 21 Reproduction monitoring controller 22 Outside air temperature sensor 31 CAN data input unit 32 Differential pressure sensor value input unit 33 Exhaust temperature sensor value input unit 34 Reproduction start signal input unit 35 Notification timing setting unit 36 Regeneration determination unit 37 Regeneration time measurement unit 38 Key signal input unit 39 Outside air Temperature sensor value input unit 40 Reproduction failure number storage unit 41 Reproduction failure state storage unit 42 CAN data output unit M Maximum reproduction time N Number of notification timings in advance P Regeneration completion pressure T Reproducible temperature

Claims (7)

In a working machine equipped with an exhaust purification device that collects particulate matter in exhaust gas from a diesel engine with a filter, burns the collected particulate matter, and regenerates the filter.
Differential pressure detecting means for detecting the differential pressure at the inlet and outlet of the filter;
Engine state detection means for detecting whether the diesel engine is operating;
Exhaust temperature detecting means for detecting the exhaust temperature from the diesel engine;
Regeneration detection means for detecting that the forced regeneration of the filter has started;
When the regeneration detection unit confirms the start of forced regeneration, and the differential pressure detected by the differential pressure detection unit is maintained higher than a threshold indicating completion of regeneration, the engine state detection unit A regeneration determination unit that determines that the forced regeneration has failed when the stop of the diesel engine is detected, or when the exhaust gas temperature detected by the exhaust gas temperature detection unit has reached a threshold value indicating that regeneration is possible;
A working machine comprising: an informing means for informing that the forced regeneration has failed when the regeneration determining means determines that the forced regeneration has failed. The work machine according to claim 1,
Reproduction failure number storage means for storing the number of times that forced regeneration has been determined to have failed by the reproduction determination means,
The informing means notifies that the forced regeneration has failed when the number of times stored in the regeneration failure number storage means reaches or exceeds a threshold indicating the notification timing. The work machine according to claim 2,
Notification that estimates the accumulation amount of particulate matter in the filter based on the differential pressure detected by the differential pressure detection means when the diesel engine is started, and sets a threshold value indicating the notification timing based on the estimated accumulation amount A timing setting means;
The notification means notifies that the forced regeneration has failed when the number of times stored in the regeneration failure number storage means reaches or exceeds a threshold set by the notification timing setting means. . The work machine according to claim 2 or 3,
The regeneration failure number storage means sets the stored number of times to zero when the differential pressure detected by the differential pressure detection means reaches a threshold value indicating completion of regeneration. The work machine according to any one of claims 1 to 4,
The notification means is a display means for displaying that the forced regeneration has failed and displaying the reason why the regeneration determining means has determined that the forced regeneration has failed as the reason why the forced regeneration has failed. machine. The work machine according to claim 5, wherein
The regeneration failure number storage means stores the number of times for each reason that the regeneration determination means determines that the forced regeneration has failed,
The work machine is characterized in that the display means further displays the number of times for each reason for determining that the forced regeneration has failed. The work machine according to any one of claims 1 to 6,
When the regeneration determining means determines that the forced regeneration has failed, the fact that the forced regeneration has failed, the reason for determining that the regeneration determining means has failed, and the position information of the work machine are installed at a remote location A work machine, further comprising a communication unit that transmits data to the management terminal.

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