JP2012097680A - Dpf control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DPF control device, capable of promoting regeneration of the DFP midway through work.SOLUTION: The DPF control device 2 includes a filter 31 for collecting particulate matter in exhaust gas from an engine 41, and a regeneration means 32 for regenerating the filter 31 by removing deposited particulate matter. Further, the control device 2 for the DFP is provided with a working machine driven by pressure oil supplied from a hydraulic pump 47 rotated by the engine 41, deposition amount detection means 33a, 33b for detecting a deposition amount of particulate matter deposited to the filter 31, a notification means 56 for notifying that the deposition amount has reached a predetermined regeneration deposition amount, and a control means 20 for limiting work by the working machine to be predetermined work if the deposition amount reaches the predetermined regeneration deposition amount.

Description

  The present invention relates to a control device for a DPF.

  Conventionally, a work vehicle such as a crane equipped with a diesel engine has a DPF (Diesel Particulate filter) in the middle of the exhaust path in order to reduce the amount of particulate matter (PM) contained in the exhaust gas. It is common to install.

  The filter built in the DPF has a porous honeycomb structure made of ceramic or the like, and the amount of PM in the exhaust gas is reduced by collecting PM passing through the filter by a porous partition wall. .

  Therefore, when PM is accumulated, the porous partition wall is clogged, and the exhaust resistance increases. In view of this, DPFs equipped with regenerating means for removing PM collected by porous partition walls by burning have come into widespread use.

  The regeneration means performs post-injection at a timing later than the main injection near the compression top dead center by the fuel injection device of the diesel engine, thereby oxidizing the fuel on the catalyst of the filter and burning PM by reaction heat.

  However, when this type of regeneration means is applied to a work vehicle such as a crane, a diesel engine is also used as a power source for the work machine. Therefore, when regeneration is automatically performed by the regeneration means, the rotational speed of the diesel engine is reduced. There was a problem that work suddenly changed and the work became unstable.

  Thus, for example, Patent Document 1 discloses an exhaust emission control device that includes a DPF and a control device, and is configured so that a regeneration control command is not output from the control device under conditions where the PTO is in an operating state.

JP 2004-150417 A

  However, since the exhaust gas purification apparatus of Patent Document 1 prohibits the regeneration operation of the DPF during execution of the work, if the conditions under which the PTO is in operation are continued, the regeneration of the DPF cannot be performed, and the amount of accumulated PM is limited. There was a problem that the DPF could not be regenerated.

  Therefore, an object of the present invention is to provide a DPF control device that can prompt the regeneration of the DPF during the work.

  In order to achieve the above object, a control device for a DPF according to the present invention comprises a filter for collecting particulate matter in exhaust gas from an engine, and a regeneration means for removing the accumulated particulate matter and regenerating the filter. A control device for a DPF having a working machine driven by pressure oil supplied from a hydraulic pump rotated by the engine, and a deposit for detecting an accumulation amount of the particulate matter deposited on the filter An amount detecting means, a notifying means for notifying that the accumulation amount has reached a predetermined regeneration accumulation amount, and a control for restricting the work by the work machine to a predetermined operation when the accumulation amount reaches a predetermined regeneration accumulation amount. Means.

  As described above, the DPF control device of the present invention is a DPF control device having a filter and a regenerating means, and includes a working machine driven by pressure oil supplied from a hydraulic pump rotated by an engine, and a filter. A deposit amount detecting means for detecting the amount of accumulated particulate matter, an informing means for notifying that the deposit amount has reached a predetermined regeneration deposition amount, and a work machine when the deposition amount reaches a predetermined regeneration deposition amount Control means for limiting the work to a predetermined work.

  According to such a configuration, when the accumulation amount of the particulate matter increases and reaches a predetermined regeneration accumulation amount, the operation is restricted, thereby prompting the operator to regenerate the DPF during the operation. it can.

It is a side view explaining the whole structure of a rough terrain crane. It is explanatory drawing explaining the structure of DPF of an Example. It is a block diagram explaining the structure of the control system of the control apparatus of DPF of an Example. It is a flowchart explaining the flow of a process of the control apparatus of DPF of an Example.

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

(Configuration of rough terrain crane)
First, the overall configuration of the rough terrain crane 1 including the DPF control device 2 of the present embodiment will be described using the side view of FIG. As shown in FIG. 1, the rough terrain crane 1 according to the present embodiment includes a carrier 10 that is a main body portion of a vehicle having a traveling function, outriggers 11,. A swivel base 12 mounted so as to be horizontally swivelable, a boom 14 mounted on a bracket 13 erected on the swivel base 12, a hoisting cylinder 15 for raising and lowering the boom 14, and a wire 16 suspended from the tip of the boom 14 A hook 17 to be lowered and a cabin 18 in which an operation lever and the like are arranged are provided.

  Here, the working machine such as the swivel base 12, the boom 14, and the winch (not shown) is a hydraulic pump that is rotated by a PTO (Power Take Off) 46 that extracts the rotational power of the diesel engine 41 as shown in FIG. 47 is driven by the hydraulic pressure generated. For this reason, with the change in the rotational speed of the diesel engine 41, the operating speed of these work machines also changes.

(Configuration of DPF control device)
Next, the configuration of the DPF control device 2 according to the present embodiment will be described with reference to FIG. The DPF control device 2 according to the present embodiment removes the particulate matter accumulated on the filter 31 and the filter 31 that collects particulate matter in the exhaust gas from the diesel engine 41 as the basic configuration of the DPF 3. Regenerating means 32 for regenerating the filter 31 (see also FIG. 3).

  The filter 31 is formed in a porous honeycomb structure with ceramic or the like, and collects particulate matter (hereinafter referred to as PM) passing through the muffler 43 by a porous partition wall, so that the PM in the exhaust gas is collected. Reduce the amount.

  In addition, since an oxidation catalyst (not shown) is disposed upstream of the filter 31 in the middle of the exhaust path, carbon monoxide, hydrocarbons, particulate matter, and the like that are easily oxidized are oxidized (burned). Removed.

  The regeneration means 32 is of a continuous regeneration system that can be regenerated while using the filter 31. The regeneration means 32 includes the above-described oxidation catalyst, a fuel injection device 50 that performs post-injection that raises the temperature of the oxidation catalyst, and a fuel injection device 50. And a fuel injection control unit 25 of the controller 20 that commands post injection (see FIG. 3).

  In addition to the filter 31 and the regeneration means 32, the DPF control device 2 of this embodiment includes a regeneration button 54 as a manual operation means for operating the regeneration means 32, and a display monitor that displays information related to meters and safety. 55, a speaker 56 that emits a warning sound and a sound, pressure sensors 33a and 33b as accumulation amount detecting means for detecting the accumulation amount of PM accumulated on the filter 31, and that the accumulation amount has reached a predetermined regeneration accumulation amount A warning lamp 53 as a notification means for notifying the vehicle, a working machine driven by pressure oil supplied from a hydraulic pump 47 rotated by the diesel engine 41, and a working machine when the accumulation amount reaches a predetermined regeneration accumulation amount. And a controller 20 as control means for limiting work.

  The regeneration button 54 as an operation means is manually operated by an operator who recognizes an increase in the accumulation amount by blinking of the warning lamp 53 to operate the regeneration means 32, and is disposed in the cabin 18.

  The display monitor 55 displays the remaining work time when the DPF 3 is regenerated while performing limited work, and is disposed in the cabin 18. The remaining time is calculated by obtaining the value of the amount of accumulated PM per unit time by the work under execution and dividing the remaining capacity of PM by this value. The amount of PM deposited per unit time can be determined in advance by experiments in order to save time and effort for calculation.

  The speaker 56 as an informing means emits a warning sound or a sound when the PM accumulated on the filter 31 reaches a predetermined regeneration accumulation amount, and is arranged in the cabin 18.

  This regeneration accumulation amount is set to such a value that even if the operation is continued during the standby time (described later) and the operation is continued, the DPF 3 is not damaged during the operation. Therefore, if the standby time has passed, it is desirable to forcibly regenerate the DPF 3 in preference to the work.

  The two pressure sensors 33a and 33b as the accumulation amount detecting means measure the pressures of the upstream inlet pipe 44 and the downstream outlet pipe 45 of the muffler 43 in the exhaust path. The measured pressure value is transmitted to the controller 20.

  The warning lamp 53 serving as a notification means blinks when the PM accumulated on the filter 31 reaches a predetermined regeneration accumulation amount and prompts regeneration, and is disposed in the cabin 18.

  The work implement is driven by hydraulic pressure generated by a hydraulic pump 47 that rotates by a PTO (Power Take Off) 46 that extracts the rotational power of the diesel engine 41. Specifically, the working machine includes a swivel base 12, a boom 14, a winch (not shown), and the like.

  Further, the controller 20 as a control means is a general-purpose microcomputer, and in addition to the function as an engine controller (ECU) for controlling the diesel engine 41, the PM accumulation amount becomes a predetermined regeneration accumulation amount as will be described later. When it reaches, it has a function as a control means for restricting work by the work machine.

(Control block configuration)
Next, the contents of the control executed by the controller 20 as the control means will be described by dividing it into control blocks.

  As shown in FIG. 3, the controller 20 of the present embodiment includes a deposition amount calculation unit 21 that calculates a deposition amount based on a pressure difference before and after the muffler 43, a limit calculation unit 22 that limits work by the work machine, A storage unit 23 for storing the fuel, a fuel injection control unit 25 for instructing the fuel injection device 50 on the amount and timing of fuel injection, and a timer as a timing device for measuring an elapsed time after the accumulated amount reaches a predetermined regeneration accumulated amount Part 26, and the like. The controller 20 is connected to a safety device 24 that prevents the rough terrain crane 1 from overturning.

  The accumulation amount calculator 21 accumulates the amount of PM on the filter 31 based on the pressure difference between the pressure value at the pressure sensor 33a upstream of the muffler 43 and the pressure value at the pressure sensor 33b downstream of the muffler 43. Is calculated indirectly. In other words, from the relationship that the pressure difference becomes smaller if the PM accumulation amount is small and the pressure difference becomes large if the PM accumulation amount is large, an approximate expression that expresses the relationship between the two is created based on experimental data. The amount of PM deposition can be calculated based on the pressure difference.

  As shown in FIG. 4 to be described later, the limit calculation unit 22 determines whether the measured accumulation amount and the predetermined regeneration accumulation amount are large or small (step S3), whether or not the storage posture is reached (step S6), and measurement. Judgment of the magnitude of the elapsed time and the predetermined standby time (step S7), and calculations related to these judgments are performed.

  The storage unit 23 stores a predetermined regeneration accumulation amount and a predetermined standby time. Here, as described above, the predetermined regeneration accumulation amount is such an accumulation amount that the DPF 3 is damaged unless the DPF 3 is forcibly regenerated within a predetermined standby time.

  Since the safety device 24 calculates the state of the work machine as a premise for calculating the work radius and the safety rate of falling, the controller 20 of the present embodiment also uses the state of the work machine that is the calculation result in the safety device 24. . That is, the safety device 24 calculates the actual state of the work implement based on the operation of the operation levers 61 to 64, the boom retract switch 65, and the like.

  For example, if the boom storage switch 65 is turned on, it is recognized that the boom is stored. On the other hand, when the turning operation lever 61, the hoisting operation lever 62, the telescopic operation lever 63, and the winch operation lever 64 are operated, the posture of the boom 14 and the vertical movement of the hook 17 at that time are calculated.

  Further, the safety device 24 includes a turning drive means 71, a undulation drive means 72, a telescopic drive means 73, and a winch drive means 74 as drive means for driving the work implement based on the operation of the operation levers 61 to 64. .

  The fuel injection control unit 25 commands the fuel injection device 50 to perform post injection based on the calculation result in the limit calculation unit 22. That is, when the regeneration is not performed, the post injection is not commanded, and when the regeneration is performed, the post injection is commanded.

  The timer unit 26 as a time measuring device is an internal clock device, and the elapsed time from when the deposition amount reaches a predetermined regeneration deposition amount so that the limit calculation unit 22 can determine the magnitude of the elapsed time and the predetermined standby time. Measure time.

(Function)
Next, the operation of the DPF control device 2 of this embodiment will be described with reference to the block diagram of FIG. 3 and the flowchart of FIG.

  First, pressures before and after the muffler 43 are detected by the pressure sensors 33a and 33b (step S1), and the accumulation amount calculation unit 21 calculates the PM accumulation amount from the relational expression based on the detected pressure difference (step S2). .

  Subsequently, the limit calculation unit 22 compares the predetermined regeneration accumulation amount stored in the storage unit 23 with the calculated accumulation amount (step S3). If the accumulation amount is equal to or greater than the regeneration accumulation amount (YES in step S3), the operator is notified through the speaker 56 that it is necessary to regenerate (step S4). For example, the worker is informed by a sound such as a buzzer sound or “PM accumulation amount is increasing, boom must be stored and DPF should be regenerated”, and the work by the work machine is limited to a predetermined work. At this time, the work machine may be temporarily stopped to notify the worker that the amount of PM accumulated is large. Further, if the boom 14 is in an operation state in which there is no suspended load and the boom can be stored, the operation may be limited so as to allow only boom storage. On the other hand, when the accumulation amount is less than the regenerated accumulation amount (NO in step S3), the process returns to step S1 to acquire the pressure again.

  Subsequently, the timer unit 26 measures the elapsed time after the notification (step S5), and the limit calculation unit 22 determines whether or not the boom 14 is in the retracted posture (step S6). If the boom 14 is in the retracted position (YES in step S6), the DPF 3 is regenerated (step S9). On the other hand, when the boom 14 is not in the retracted position, the process waits for the standby time to elapse (steps S5 to S7).

  Then, the limit calculation unit 22 compares the predetermined waiting time stored in the storage unit 23 with the measured elapsed time (step S7).

  If the elapsed time is equal to or longer than the standby time (YES in step S7), the limit calculation unit 22 limits the work (step S8). Specifically, the work being executed is stopped.

  When the elapsed time is less than the standby time (NO in step S7), the limit calculation unit 22 waits until the elapsed time becomes equal to or longer than the standby time (steps S5 to S7). Here, as the elapsed time approaches the standby time, the speed of the work being performed may be made slower than usual to encourage boom storage and DPF regeneration. Further, when the boom retract switch 65 is selected, DPF regeneration may be started.

Then, the fuel injection control unit 25 instructed to regenerate the DPF 3 due to the restriction of the work orders the fuel injection device 50 to perform post injection, thereby raising the temperature of the oxidation catalyst and depositing on the filter 31. The particulate matter thus burned is burned (step S9).
(effect)
Next, the effects of the DPF control device 2 of this embodiment will be listed and described.

  (1) As described above, the DPF control device 2 according to the present embodiment is a DPF control device 2 having the filter 31 and the regeneration means 32, and the pressure supplied from the hydraulic pump 47 rotated by the diesel engine 41. A working machine driven by oil, pressure sensors 33a and 33b as accumulation amount detection means for detecting the accumulation amount of PM accumulated on the filter 31, and a notification for informing that the accumulation amount has reached a predetermined regeneration accumulation amount A speaker 56 as means, and a controller 20 as control means for restricting work by the work machine when the accumulation amount reaches a predetermined regeneration accumulation amount are provided.

  According to such a configuration, when the PM accumulation amount increases and reaches a predetermined regeneration accumulation amount, the operation is restricted, and thus the regeneration of the DPF 3 can be promoted. Here, the limited work includes a limited work by adding some restrictions to the normal work, or stopping the normal work.

  That is, the work by the work machine is not completely prohibited, and it becomes difficult to continue the work by adding a relatively light and temporary restriction, so that the worker desires to regenerate the DPF 3.

  (2) Further, the work restricted by the work machine is a work for prompting the regeneration of the DPF 3 with the boom stored, and the work is stopped and the regeneration of the DPF 3 with the boom 14 stored is prompted. Can do.

  (3) Furthermore, the controller 20 as the control means reliably notifies the worker that the amount of accumulated PM is large by stopping the work in progress before the work that is restricted by the work machine is executed. be able to.

  In other words, when the work being executed corresponds to a work restricted by chance, the work can be continued as it is, and the worker may not notice an increase in PM. Therefore, by temporarily stopping the work being executed, the worker can be surely aware of the increase in PM. In this case, it is preferable to slowly stop the work being executed.

  (4) And it further includes a timer unit 26 as a time measuring device for measuring an elapsed time after the accumulation amount reaches a predetermined regeneration accumulation amount, and the controller 20 as the control means has the elapsed time set to a predetermined standby time. If it becomes, it will be characterized by further restricting the work by the work machine.

  That is, after informing the increase in the amount of accumulated PM, if the boom 14 is not stored even after the standby time has elapsed, it is assumed that there is no intention to regenerate and the operation is stopped and the regeneration of the DPF 3 is forced. Can do.

  In addition, even though there is an intention to regenerate the DPF 3, it is possible to prevent the work being performed from being restricted as soon as the accumulated amount reaches the regenerated accumulated amount, thereby making it difficult to work.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to the present invention. included.

  For example, in the above embodiment, the rough terrain crane equipped with the DPF control device 2 has been described. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention can also be applied.

  Moreover, although the said Example demonstrated the case where the speaker 56 was used as an alerting | reporting means, it is not limited to this, The warning lamp 53 or the display monitor 55 can also be used as an alerting | reporting means.

  Further, in the above-described embodiment, the case where the timer unit 26 as the time measuring device is arranged inside the controller 20 is described. However, the present invention is not limited to this, and the time measuring device is different from the controller 20. Also good.

1 rough terrain crane 14 boom 2 DPF control device 20 controller (control means)
3 DPF
31 Filter 32 Regeneration means 33a, 33b Pressure sensor (deposition amount detection means)
41 Diesel engine
43 Muffler 46 PTO
47 Hydraulic pump 50 Fuel injection device 54 Regeneration button 61 Swing operation lever 62 Elevation operation lever 63 Telescopic operation lever 64 Winch operation lever 65 Boom storage switch 66 ESP boom storage switch

Claims (4)

A control device for a DPF having a filter that collects particulate matter in exhaust gas from an engine, and regeneration means that removes the accumulated particulate matter and regenerates the filter,
A working machine driven by pressure oil supplied from a hydraulic pump rotated by the engine;
A deposition amount detecting means for detecting a deposition amount of the particulate matter deposited on the filter;
Informing means for informing that the accumulation amount has reached a predetermined regeneration accumulation amount;
A control device for a DPF, comprising: control means for restricting the work performed by the work machine to a predetermined work when the accumulation quantity reaches a predetermined regeneration accumulation quantity.   2. The DPF control device according to claim 1, wherein the limited work of the work machine is a work for prompting regeneration of the DPF in a state in which the boom is retracted.   3. The DPF control apparatus according to claim 1, wherein the control unit stops a work being executed before execution of the restricted work of the work machine. 4. Further comprising a time measuring device for measuring an elapsed time after the accumulation amount reaches a predetermined regeneration accumulation amount,
4. The DPF control apparatus according to claim 1, wherein the control unit further restricts the work performed by the work implement when the elapsed time reaches a predetermined standby time. 5.