JP2013124579A - Working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform DPF regeneration according to the using form of an operator (user) operating a working machine.SOLUTION: A filter regeneration control device 25 includes: an automatic regeneration mode 30 for automatically raising, when an accumulation amount is a predetermined value or more, the exhaust temperature in an exhaust emission control device toward a combustion temperature range in which combustion of particulate matter is promoted to combust the particulate matter; a semi-automatic regeneration mode 31 for raising the exhaust temperature to the combustion temperature range based on an external temperature rising instruction; and a switching means 35 for switching between the automatic regeneration mode 30 and the semi-automatic regeneration mode 31.

Description

  The present invention relates to a working machine such as a tractor, a combiner, a backhoe and a wheel loader provided with a diesel particulate filter (DPF).

  Generally, a diesel engine is provided with a diesel particulate filter (DPF) that collects particulate matter (particulate matter) contained in exhaust gas. The DPF collects particulate matter contained in exhaust gas from the diesel engine, and the collected particulate matter gradually accumulates. For this reason, in a vehicle equipped with a DPF, a DPF regeneration technique has been developed in which the exhaust temperature of a diesel engine is increased, the particulate matter deposited on the DPF is burned, and the particulate matter deposited on the DPF is reduced. .

Development of DPF regeneration technology has been carried out on larger trucks than before, but agricultural machinery such as tractors and combines and work machines such as backhoes are equipped with diesel engines, and the DPF regeneration technology unique to the work equipment is Has been developed.
There exists a thing shown in patent document 1 as a DPF reproduction | regeneration technique of a working machine.
Patent Document 1 includes a rewritable variable storage unit that stores a general-purpose regeneration program that selectively executes one of a plurality of regeneration modes for an exhaust gas purification device, and a flag table that corresponds to an arbitrary regeneration mode. The ECU executes the general reproduction program in the reproduction mode selected based on the flag table. The technique of Patent Document 1 is a technique for setting a program for DPF regeneration that is suitable for each work machine in correspondence with a wide variety of work machines.

JP 2011-185109 A

  Now, even if the working machine such as a tractor is of the same model, there are various usage forms such as using it mainly in the field, using it in the greenhouse, or using it on the farm. On the other hand, in the DPF regeneration, the exhaust temperature rises and there is a possibility of affecting the tractor operation. For this reason, it is preferable to perform DPF regeneration in accordance with the usage pattern of the tractor, and it is necessary to have a DPF regeneration mode corresponding to various usage patterns, and the mode can be switched according to the usage pattern. Preferably, such demand is increasing.

As described above, although there is a technique for switching a plurality of modes as shown in Patent Document 1, this technique sets a mode for each model corresponding to a wide variety of work machines. In the model, the playback mode could not be arbitrarily switched in accordance with the usage form of the worker.
Therefore, an object of the present invention is to provide a working machine capable of smoothly performing DPF regeneration in accordance with the usage pattern of the operator (user) who operates it.

In order to achieve the above object, the present invention has taken the following measures.
According to the working machine according to claim 1, the exhaust gas purification device including a filter that collects particulate matter contained in the exhaust gas exhausted from the diesel engine, and the particles deposited on the filter of the exhaust gas purification device A filter regeneration control device that burns and removes the particulate matter when the accumulation amount of the particulate matter is a predetermined value or more, and the filter regeneration control device includes the filter regeneration control device when the accumulation amount is the prescribed value or more. Automatic regeneration mode that automatically raises the exhaust temperature in the exhaust gas purifier toward the combustion temperature range where combustion of particulate matter promotes and burns particulate matter, and exhaust temperature based on external temperature rise command And a switching means for switching between the automatic regeneration mode and the semi-automatic regeneration mode.

According to a work machine of a second aspect, the switching means switches between the automatic regeneration mode and the semi-automatic regeneration mode based on a switching signal inside the filter regeneration control device.
According to a third aspect of the present invention, the switching means switches between the automatic regeneration mode and the semi-automatic regeneration mode based on a switching signal external to the filter regeneration control device.

  According to the work machine according to claim 4, the filter regeneration control device includes an engine control unit capable of increasing a temperature of exhaust gas by performing a temperature increase control for increasing the temperature of the diesel engine, and the engine control unit. A work implement control unit that operates in conjunction with the engine control unit, wherein the engine control unit performs the temperature increase control to increase the temperature toward the combustion temperature range, and the external regeneration mode during the temperature increase control. The switching means for switching between the semi-automatic regeneration mode and the automatic regeneration mode and the semi-automatic regeneration mode in which the temperature rise command is waited and the temperature rise control is further performed after the external temperature rise command is received and the temperature is raised toward the combustion temperature range. The working machine control unit includes switching signal output means for outputting the switching signal to the engine control unit.

According to the working machine of the fifth aspect, the filter regeneration control device includes a mode storage unit that stores an execution flag for executing a mode switched by the switching signal.
According to the working machine of the sixth aspect, the regeneration switch for performing the external temperature raising command is installed on the front side of the driver's seat.

According to the first aspect of the present invention, since the filter regeneration control device has an automatic regeneration mode and a semi-automatic regeneration mode, and these modes can be freely switched, DPF regeneration corresponding to the use form of the operator can be performed in the same model. It can be carried out.
According to the second aspect, for example, a serviceman of a manufacturing company that manufactures a work machine by performing a maintenance of the work machine by listening to a request from an operator (user) or arbitrarily operates the internal switching unit. The mode can be switched.

According to the third aspect, for example, when an operator operates the work machine to perform work, the mode can be arbitrarily switched by operating the internal switching unit according to the usage mode.
According to the fourth aspect, the DPF regeneration can be easily managed by the work implement control unit (work implement control device), and a plurality of types of engine control units (engine control devices) can be handled.

According to the fifth aspect, since the execution flag for executing the mode switched by the switching signal is stored, for example, when the usage pattern is the same in the long term, this usage pattern is supported. Can be easily fixed to the selected mode.
According to the sixth aspect, the operator can easily press the regeneration switch even during driving, and can perform the DPF regeneration when it is desired to perform the DPF regeneration.

It is a whole block diagram of the exhaust system of the engine in 1st Embodiment. It is a lighting transition diagram of the switch in the semi-automatic reproduction mode and the automatic reproduction mode. It is a whole block diagram of the exhaust system of the engine in a modification. It is a whole block diagram of the exhaust system of the engine in 2nd Embodiment. It is a whole block diagram of the exhaust system of the engine in 3rd Embodiment. It is the whole tractor side view.

[First embodiment]
The work machine of the present invention includes a diesel particulate filter (DPF) and a means for burning and removing particulate matter deposited on the DPF. Such a working machine is an agricultural machine such as a tractor or a combiner and a construction machine such as a backhoe or a compact truck loader (CTL), which can perform a work such as a farm work or a construction work. To do.

  As shown in FIG. 6, the tractor 1 is configured by mounting a diesel engine 3, a transmission 4, and the like on a traveling vehicle body 2 having front and rear wheels. A three-point link mechanism 5 is provided at the rear portion of the traveling vehicle body 2 so as to be movable up and down. Various working devices 6 such as a tillage device, a fertilizer application device, and a harvesting device are detachable from the three-point link mechanism 5. The power from the diesel engine 3 is transmitted to the work device 6 via the PTO shaft. In addition, an independently mounted cabin 7 is provided behind the diesel engine 3, and a driver's seat 8 is provided in the cabin 7. A display device 9 that performs various displays of the tractor 1 is provided on the front side (front side) of the driver's seat 8.

FIG. 1 shows the structure of the exhaust system in the diesel engine 3. Normally, the diesel engine 3 is often a multi-cylinder engine having a plurality of cylinders (cylinders), but FIG. 1 shows one of them.
Hereinafter, the exhaust system of the diesel engine 3 will be described in detail.
As shown in FIG. 1, an intake port 11, which is an opening for introducing air into the cylinder 10, is formed in an upper portion of a cylinder 10 of a diesel engine (hereinafter referred to as an engine) 3 and after combustion. An exhaust port 12 that is an opening for discharging gas (combustion gas) from the cylinder 10 is formed. Further, an intake valve 13 for opening and closing the intake port 11 and an exhaust valve 14 for opening and closing the exhaust port 12 are provided at the upper portion of the cylinder 10.

  The intake port 11 is connected to a tubular intake manifold 15 that serves as a flow path for air introduced into the cylinder 10. The exhaust port 12 is connected to a tubular exhaust manifold 16 serving as a flow path for combustion gas discharged from the cylinder 10. A silencer 17 for reducing exhaust noise is provided at the end of the exhaust manifold 16, and the combustion gas passes through the silencer 17 and is discharged to the outside.

  In the exhaust manifold 16, an exhaust gas purification device 20 is provided between the exhaust port 12 and the silencer 17. The exhaust gas purification device 20 collects and purifies particulate matter contained in the exhaust gas that passes through. That is, the combustion gas discharged from the cylinder 10 through the exhaust port 12 becomes exhaust gas, passes through the exhaust manifold 16, is purified by the exhaust gas purification device 20, and reaches the silencer 17.

  The exhaust gas purification device 20 has a DPF 21 inside. The DPF 21 is a filter for collecting particulate matter contained in the exhaust gas. For example, the DPF 21 is made of ceramic and has a cross section having a honeycomb structure. That is, for example, a number of hexagonal-column straw-shaped polygonal through holes are adjacent to each other along the longitudinal direction from one end to the other end of the DPF 21, and each through hole has a predetermined interval along the longitudinal direction of the DPF 21. A porous partition is provided.

  Exhaust gas that has entered from one end side (incoming side) of the DPF 21 flows toward the other end side (outward side) of the DPF 21 while passing through a porous partition formed in the through hole. Particulate matter contained in the exhaust gas is collected by the DPF 21 by adhering to the porous partition walls or adhering to the inner wall of the through hole, and the exhaust gas purified by the DPF 21 is discharged to the outside. Although not shown, the exhaust system of the diesel engine 3 is an oxidation catalyst (not shown) for oxidizing the fuel in the particulate matter and the nitrogen oxide in the combustion gas between the entrance side of the DPF 21 and the engine 3. Diesel oxidation catalyst).

In the tractor 1 of the present invention, cleaning for reducing the amount of particulate matter deposited on the DPF 21 (referred to as PM deposition amount) under the control of the filter regeneration control device 25 configured by a CPU or the like, that is, regeneration of the DPF (DPF regeneration). Sometimes).
The filter regeneration control device 25 is constructed by providing a DPF regeneration function to an engine control unit (engine control device) that controls the engine 3 and the like, and the work load on the tractor 1 is normal when DPF regeneration is not performed. The engine 3 is controlled according to the above, and when the DPF regeneration is performed, the engine is controlled differently from the normal time to perform the DPF regeneration.

  The filter regeneration control device 25 normally controls an injector, a common rail, a supply pump, and the like based on control signals such as an accelerator lever operation amount, an accelerator pedal operation amount, a crank position, and a cam position. Note that the diesel engine control of the filter regeneration control device 25 at the normal time is the same as general diesel engine control. For example, in the control of the injector, the fuel injection amount, the injection timing, etc. are set, and the supply pump or common rail In this control, the fuel injection pressure is set. As a matter of course, in the tractor 1, when the operator operates the accelerator lever or the accelerator pedal, the amount of operation of the accelerator lever or the amount of operation of the accelerator pedal changes, and the engine speed can be increased or decreased. it can.

  In addition to the filter regeneration control device 25, the tractor 1 includes a work machine control device (not shown) that performs various controls related to the tractor 1. For example, the work machine control device controls the lifting and lowering of the three-point link mechanism 5 or the like based on an operation lever provided around the driver's seat 8, and performs a shift control of the transmission. The work machine control device may perform any control as long as it mainly performs control related to work in the tractor (work machine), and is not limited to the above-described control.

As shown in FIG. 1, the filter regeneration control device 25 includes an automatic regeneration mode 30 and a semi-automatic regeneration mode 31.
The automatic regeneration mode 30 and the semi-automatic regeneration mode 31 are configured by a control program for performing DPF regeneration stored in the control unit 29 of the filter regeneration control device 25. When DPF regeneration is necessary, the automatic regeneration mode 30 or The semi-automatic regeneration mode 31 operates to perform DPF regeneration. The filter regeneration control device 25 is in either the automatic regeneration mode 30 or the semi-automatic regeneration mode 31 during DPF regeneration. Further, the PM accumulation amount is sufficiently reduced in both the semi-automatic regeneration mode 31 and the automatic regeneration mode 30 (when the accumulation amount is reduced to a level at which DPF regeneration is unnecessary, the automatic regeneration mode 30 or the semi-automatic regeneration mode 31 is performed. Then, the filter regeneration control device 25 returns to normal control, even when DPF regeneration is performed in the automatic regeneration mode 30, the filter regeneration control device 25 can change the engine speed such as increase / decrease of the engine speed by an accelerator or the like. Control can be performed.

First, the semi-automatic reproduction mode 31 will be described.
When the filter regeneration control device 25 is in the semi-automatic regeneration mode 31 and the PM accumulation amount reaches a predetermined value (a threshold value or more) that requires DPF regeneration, the filter regeneration control device 25 switches from normal control, and is semi-automatic. Control of DPF regeneration in the regeneration mode 31 is started. Here, the PM accumulation amount is estimated based on the differential pressure between the exhaust pressure on the inlet side of the DPF 21 and the exhaust pressure on the outlet side of the DPF 21. Specifically, the exhaust pressure near the entry side of the DPF 21 (exhaust gas purification device 20) is detected by the entry pressure sensor 22, and the exhaust pressure near the exit side of the DPF 21 (exhaust gas purification device 20) is detected by the exit pressure sensor 23. The filter regeneration control device 25 detects the difference between the exhaust pressure detected on the inlet side and the outlet side of the exhaust gas purification device 20 from the exhaust pressure detected by the inlet pressure sensor 22 and the exhaust pressure detected by the outlet pressure sensor 23. (Differential pressure) is calculated. When the PM accumulation amount is large, the differential pressure that is the difference in the exhaust pressure is large, and when the PM accumulation amount is small, the differential pressure of the exhaust pressure is also small. Therefore, the filter regeneration control device 25 uses this relationship to calculate. The amount of PM deposited on the DPF is determined from the differential pressure. The relationship between the differential pressure and the PM accumulation amount is stored in the filter regeneration control device 25 in the form of a control program or a control parameter in advance. In this embodiment, the PM accumulation amount is calculated from the difference in the exhaust pressure. However, the present invention is not limited to this, and the PM accumulation amount may be calculated based on the operating time when the engine 3 is operated, the fuel consumption amount, and the like. Any method for calculating the PM deposition amount may be used.

In the semi-automatic regeneration mode 31 described above, when the PM accumulation amount exceeds the threshold, first, the exhaust temperature in the exhaust gas purification device 20 is automatically raised, and an external temperature raising command is waited during the temperature raising. In this mode, the temperature is raised to a temperature range (combustion temperature range) where combustion is promoted after receiving an external temperature raising command, and the exhaust temperature is raised stepwise.
Specifically, in the semi-automatic regeneration mode 31, when the PM accumulation amount becomes equal to or greater than the threshold value, first, the temperature is raised toward a predetermined first target temperature, and when the first target temperature is reached, the driver's seat 8 The regeneration switch 32 provided around is flashed to notify that the first target temperature has been reached, and wait for further temperature increase. In the semi-automatic regeneration mode 31, when the operator presses the regeneration switch 32 (outputs an external temperature increase command), the temperature is increased to a second target temperature that is a temperature range in which combustion is promoted in response to the external temperature increase command. I do.

The regeneration switch 32 includes an LED or the like, and the regeneration switch 32 lights up and blinks when DPF regeneration is necessary, and is a push button type that can issue an external temperature increase command for DPF regeneration by pressing. Switch. This regeneration switch 32 is provided in front of the driver's seat 8 and around a display device (meter panel) 9 that performs various displays. More specifically, when the semi-automatic regeneration mode 31 is activated, the filter regeneration control device 25 is Then, a signal for instructing the throttle of the intake throttle to be output to the engine 3 or the like to throttle the intake throttle, whereby the exhaust temperature in the exhaust gas purification device 20 (exhaust temperature on the inlet side of the DPF 21, that is, the temperature in the DPF 21) Is controlled to raise the temperature toward 250 ° C., which is the first target temperature.

  Now, in a working machine such as the tractor 1, there is a case where the tractor 1 enters the field and works with the tractor 1, and the exhaust gas discharged from the engine 3 may hit combustibles such as crops or a greenhouse in the field. . Since the first target temperature described above is not a high temperature that damages the crop, in the semi-automatic regeneration mode 31, first, the temperature is raised to the first target temperature and waited.

  As described above, after the intake throttle is automatically throttled, it is determined whether or not the exhaust temperature has reached the first target temperature. Specifically, when the throttle of the intake throttle is performed by the semi-automatic regeneration mode 31, the measured temperature of the exhaust gas on the inlet side of the DPF 21 measured by the temperature sensor 27 provided on the inlet side of the DPF 21 becomes 250 ° C. or higher. Thus, the filter regeneration control device 25 determines that the exhaust temperature after throttling of the intake throttle has reached the first target temperature. Note that the throttle operation of the intake throttle is continued in a state where the exhaust temperature has not reached the first target temperature.

  As shown in FIG. 2A, in a state where the exhaust temperature has reached the first target temperature of 250 ° C., the filter regeneration control device 25 outputs a control signal to the regeneration switch 32, and the regeneration switch 32 is concerned. Blinks. The flashing of the regeneration switch 32 is for confirming whether or not the second stage temperature increase control for raising the exhaust gas temperature to the second target temperature higher than the first target temperature may be performed to the operator. When the regeneration switch 32 is pressed in a state where the regeneration switch 32 is blinking, the process proceeds to the second stage temperature increase control.

  In the DPF regeneration, the temperature increase in the second stage is to increase the exhaust temperature to a second target temperature (for example, 600 ° C.) that is a temperature range in which the combustion of the particulate matter is promoted. The temperature is much higher than the first target temperature when the temperature is raised in the first stage, and the temperature of the exhaust gas becomes higher as the temperature rises in the second stage. For this reason, as described above, the flashing of the regeneration switch 32 informs that the second stage temperature increase can be performed and confirms whether the second stage temperature increase may be performed.

For example, when an operator (driver) who drives the tractor 1 is traveling in a place where there is no combustible material such as a crop while the tractor 1 is in the field during the operation of the tractor 1, Alternatively, the regeneration switch 32 is pressed when the operation in the field is temporarily interrupted and traveling on a farm road or the like.
When the regeneration switch 32 is pressed (by manual operation) to instruct that the exhaust temperature may be raised to the second target temperature at which particulate matter combustion is promoted, the filter regeneration control device 25 immediately outputs an instruction to the engine or the like. Then, the post-injection is started, and the exhaust gas temperature is increased all at once toward the second target temperature (600 ° C.) that is a temperature range in which the combustion of the particulate matter is promoted.

As shown in FIG. 2A, when the regeneration switch 32 is pressed, the filter regeneration control device 25 outputs a control signal to the regeneration switch 32, and the regeneration switch 32 is changed from blinking to lighting, and post injection is performed. Indicates that
As described above, when the filter regeneration control device 25 is in the semi-automatic regeneration mode 31, when the PM accumulation amount becomes equal to or greater than the first threshold, the intake throttle is throttled and the exhaust temperature becomes the first target temperature. When the regeneration switch 32 is pushed at this stage, post injection is performed and the exhaust gas temperature becomes the second target temperature, so that the PM accumulation amount decreases.

As described above, in the semi-automatic regeneration mode 31, when the exhaust temperature is once raised to the first target temperature and then raised to the second target temperature, the operator is checked, so that the worker DPF regeneration can be performed immediately in consideration of the above.
Next, the automatic reproduction mode 30 will be described.
When the filter regeneration control device 25 is in the automatic regeneration mode 30 and the PM accumulation amount reaches a predetermined value (a threshold value or more) that requires DPF regeneration, the filter regeneration control device 25 switches from normal control and automatically The regeneration mode 30 is entered to control the DPF regeneration. Here, the threshold for determining to start the automatic playback mode 30 and the threshold for determining to start the semi-automatic playback mode are the same value.

The automatic regeneration mode 30 is a mode in which the exhaust temperature is raised at once to a temperature range in which combustion is automatically promoted. That is, unlike the automatic regeneration mode 31, the automatic regeneration mode 30 performs the DPF regeneration by raising the exhaust temperature without confirming the operator.
More specifically, when the automatic regeneration mode 30 is activated, the filter regeneration control device 25 outputs a signal for instructing the throttle of the intake throttle to the engine 3 or the like to perform throttle of the intake throttle and perform post-injection. Then, the exhaust gas temperature is raised at a stroke toward the second target temperature of 600 ° C. to reduce the PM deposition amount.

  As shown in FIG. 2B, when the filter regeneration control device 25 is in the automatic regeneration mode 30 and the PM accumulation amount is less than the threshold value (when DPF regeneration is not executed), the filter regeneration control device 25 performs the DPF switch 33. A control signal is output to DPF switch 33 to blink. Similar to the regeneration switch 32, the DPF switch 33 is installed on the front side of the driver's seat 8 and around the display device 9. The DPF switch 33 is a push-button switch with a built-in LED and the like. The blinking of the DPF switch 33 indicates that the filter regeneration control device 25 is in the automatic regeneration mode 30, and indicates that the DPF regeneration can be automatically performed.

As shown in FIG. 2B, when the filter regeneration control device 25 executes DPF regeneration in the automatic regeneration mode 30, the filter regeneration control device 25 outputs a control signal to the DPF switch 33 and turns on the DPF switch 33. Let The lighting of the DPF switch 33 indicates that DPF regeneration in the automatic regeneration mode 30 is being executed.
Thus, unlike the semi-automatic regeneration mode 31, the automatic regeneration mode 30 automatically performs DPF regeneration and reduces the PM deposition amount when the PM deposition amount exceeds the threshold without requiring operator confirmation. Can be reduced.

When DPF regeneration is being executed in the automatic regeneration mode 30, pressing the DPF switch 33 can stop DPF regeneration in the automatic regeneration mode 30. That is, when the DPF switch 33 is pressed, the filter regeneration control device 25 stops the DPF regeneration and stops the throttle of the intake throttle and the post injection even if the PM accumulation amount is equal to or greater than the threshold value.
In the working machine of the present invention, as described above, since the filter regeneration control device 25 is provided with the semi-automatic regeneration mode 31 and the automatic regeneration mode 30, DPF regeneration can be performed using either of them. The semi-automatic regeneration mode 31 is a mode in which DPF regeneration is finally completed mainly after confirming the operator's intention, and DPF regeneration can be performed while judging the work situation. On the other hand, the automatic regeneration mode 30 is a mode in which the DPF regeneration is completed without confirmation regardless of the operator's intention, and the DPF regeneration can be automatically performed without the operator being aware of the PM accumulation amount. . As described above, the semi-automatic reproduction mode 31 and the automatic reproduction mode 30 have respective characteristics.

In a working machine such as a tractor, there are various usage forms of workers (users), and the semi-automatic regeneration mode 31 is more suitable or the automatic regeneration mode 30 is more suitable due to the relationship with the work of the working machine. Can be considered.
Therefore, in the present invention, the filter regeneration control device 25 has an automatic regeneration mode 30 and a semi-automatic regeneration mode 31 so that DPF regeneration suitable for the usage pattern can be performed in consideration of various usage patterns. Switching means 35 for switching is provided. The switching means 35 is also composed of a control program or the like stored in the control unit 29 of the filter regeneration control device 25, and the switching means 35 is connected to the automatic regeneration mode 30 and the semi-automatic regeneration based on a switching signal inputted from the inside. Switch to mode 31.

  Specifically, as shown in FIG. 1, the filter regeneration control device 25 is provided with an internal switching unit 40 including a dip switch and the like, and a switching signal of the dip switch 40 is input to the control unit 29. It has come to be. The dip switch 40 is a switch that can be switched in two directions. When switched to one, the automatic regeneration mode 30 is selected, and when switched to the other, the semi-automatic regeneration mode 31 is selected.

  When the automatic regeneration mode 30 is selected by the DIP switch 40 and a switching signal corresponding to the automatic regeneration mode 30 is input, the switching unit 35 sets the filter regeneration control device 25 to the automatic regeneration mode 30 during DPF regeneration. Further, when the semi-automatic regeneration mode 31 is selected by the DIP switch 40 and a switching signal corresponding to the semi-automatic regeneration mode 31 is input, the switching unit 35 sets the filter regeneration control device 25 to the semi-automatic regeneration mode 31 during DPF regeneration.

  The internal switching unit 40 such as a dip switch for instructing the automatic regeneration mode 30 or the semi-automatic regeneration mode 31 is mainly used for maintenance of the tractor 1 or operation by a serviceman of a manufacturing company that manufactures the tractor. The operation is performed at the time of maintenance of the tractor 1 or manufacture and shipment of the tractor. At the time of manufacture and shipment of the tractor 1, the semi-automatic regeneration mode 31 is set by the dip switch 40. The semi-automatic regeneration mode 31 is set at the time of manufacture and shipment of the tractor 1, but the semi-automatic regeneration mode 31 can be performed by operating a dip switch 40 by a serviceman according to a user's request at the time of maintenance or the like.

  In the embodiment described above, the filter regeneration control device 25 is provided with the internal switching unit 40 such as a dip switch, and the switching means 35 switches between the automatic regeneration mode 30 and the semi-automatic regeneration mode 31 in response to a switching signal from the inside. However, as shown in the modified example of FIG. 3, the switching means 35 may switch between the automatic reproduction mode 30 and the semi-automatic reproduction mode 31 according to an external switching signal.

  As shown in FIG. 3, to the filter regeneration control device 25, for example, an external switching unit 41 configured by a push button type external switch is connected. The external switch 41 is installed around the display device 9 and is installed in the vicinity of the regeneration switch 32 and the DPF switch 33. When the external switch 41 is pressed once, the automatic playback mode 30 is selected, and when the external switch 41 is pressed again, the semi-automatic playback mode 31 is selected. The external switch 41 may be a two-way switch, and may be configured to be in the automatic regeneration mode 30 when it is on one side and the semi-automatic regeneration mode 31 when it is on the other side.

  When the automatic regeneration mode 30 is selected by the external switch 41 and a switching signal corresponding to the automatic regeneration mode 30 is input, the switching unit 35 sets the filter regeneration control device 25 to the automatic regeneration mode 30. Further, when the semiautomatic regeneration mode 31 is selected by the external switch 41 and a switching signal corresponding to the semiautomatic regeneration mode 31 is input, the switching unit 35 sets the filter regeneration control device 25 to the semiautomatic regeneration mode 31.

  In the modification of FIG. 3, unlike the internal switching unit 40, the switching signal is output in response to the selection from the external switching unit 41, so that it is an operator (driver) who operates the tractor 1. However, the mode can be switched while working with the tractor 1, and DPF regeneration can be performed freely. For example, DPF regeneration (temperature increase) is confirmed as semi-automatic regeneration mode 31 when working in a field, and DPF regeneration is automatically performed as automatic regeneration mode 30 when traveling on a public road. .

  When the DPF regeneration is necessary (when the PM accumulation amount exceeds the threshold), the switching means 35 is in the state of the internal switching unit 40 or the external switching unit 41 (semi-automatic regeneration mode 31 side or automatic regeneration). It may be switched to the mode corresponding to the switching signal after determining whether it is the mode 30 side or not, but when an internal or external switching signal is input, an execution flag for executing each mode is set. You may make it memorize | store (hold).

As shown in FIGS. 1 and 3, the filter regeneration control device 25 may be provided with a storage unit (mode storage unit) 42 including a non-volatile memory, and the execution flag may be stored in the mode storage unit 42. .
If the switching signal output from the internal switching unit 40 or the external switching unit 41 indicates the semi-automatic reproduction mode 31, the switching unit 35 stores the execution flag indicating the semi-automatic reproduction mode 31 in the mode storage unit 42. If the switching signal indicates the automatic regeneration mode 30, an execution flag indicating the automatic regeneration mode 30 is stored in the mode storage unit. When the DPF regeneration is necessary, the filter regeneration control device 25 enters the semi-automatic regeneration mode 31 or the automatic regeneration mode 30 based on the execution flag stored in the mode storage unit 42 and executes the DPF regeneration.

As described above, according to the present invention, the filter regeneration control device 25 includes the automatic regeneration mode 30 and the semi-automatic regeneration mode 31, and further includes the switching unit 35 that switches between the automatic regeneration mode 30 and the semi-automatic regeneration mode 31. DPF regeneration according to the usage pattern of the work machine (tractor) can be performed.
[Second Embodiment]
In the embodiment described above, the filter regeneration control device 25 is configured by providing the engine control unit (engine control device) with the DPF regeneration function. However, as shown in FIG. 4, in the second embodiment, the filter regeneration control device. 25 includes a work machine control device 26 (work control unit) that controls the work machine, and an engine control device (engine control unit) 28 that controls the engine, and the work machine control device 26 controls DPF regeneration. Is positioned higher than the engine control device 28. The engine control device 28 includes an automatic regeneration mode 30, a semi-automatic regeneration mode 31, a switching unit 35, and a mode storage unit 42, as in the above-described embodiment. Since the mode 31 and the mode storage unit 42 are the same as those in the first embodiment, description thereof is omitted.

  The work machine control device 26 controls the work machine 1 as described in the first embodiment, and can exchange data with the engine control device 28 via an in-vehicle network such as CAN. ing. The work machine control device 26 is provided with a switching signal output means 43 that outputs a switching signal to the engine control device 28. The switching signal output means 43 is composed of a control program for performing DPF regeneration stored in the control unit 36 of the work machine control device 26.

  An internal switching unit 40 (dip switch) is connected to the inside of the work machine control device 26, and a command for selecting either the automatic regeneration mode 30 or the semi-automatic regeneration mode 31 by the dip switch 40 is issued to the work machine. When input to the control unit 36 of the control device 26, the switching signal output means 43 outputs a switching signal corresponding to the mode selected by the DIP switch 40 to the engine control device 28. The switching means 35 of the engine control device 28 switches the engine control device 28 to the automatic regeneration mode 30 or the semi-automatic regeneration mode 31 based on the switching signal output from the work implement control device 26. It should be noted that an external switching unit 41 (external switch 41) similar to the modification of FIG. 3 is connected to the work machine control device 26 instead of the internal switching unit 40, and the automatic regeneration mode 30 and the semi-automatic regeneration mode are performed by the external switch 41. 31 is input to the work machine control device 26, the switching signal output means 43 outputs a switching signal corresponding to the mode selected by the external switch 41 to the engine control device 28. May be.

In the second embodiment, since the switching signal is output from the work implement control device 26 to the engine control device 28, the work implement control device 26 has the automatic regeneration mode 30 or the comparison with the first embodiment. The user has the right to select the semi-automatic playback mode 31.
Further, as shown in FIG. 4, the regeneration switch 32 is connected to the work implement control device 26, and when there is an external temperature increase command from the regeneration switch 32, the work implement control device 26 instructs the engine control device 28. Thus, the DPF regeneration operation (second temperature increase) in the semi-automatic regeneration mode is permitted. That is, the engine control device 28 automatically performs the first stage temperature increase, but does not perform the second stage temperature increase such as post injection without permission from the work implement control device 26. In the semi-automatic regeneration mode 31, a notification for confirming whether or not the second stage temperature increase control may be performed (flashing of the regeneration switch 32), and a notification of executing the semi-automatic regeneration mode 31 (the regeneration switch 32). Is turned on via the work implement control device 26 by the engine control device 28 outputting a control signal to the work implement control device 26.

  Further, the DPF switch 33 is also connected to the work machine control device 26, and when there is a stop command from the DPF switch 33, the work machine control device 26 stops the DPF regeneration in the automatic regeneration mode to the engine control device 28. To do. In the automatic regeneration mode 30, the notification that the automatic regeneration mode 30 is being performed (flashing of the DPF switch 33) and the notification that the automatic regeneration mode 30 is being performed (the DPF switch 33 is turned on) This is performed via the work machine control device 26 by outputting a control signal to the machine control device 26. In addition, other information necessary for DPF regeneration (numerical values of the inlet pressure sensor 22, numerical values of the outlet pressure sensor 23, temperature sensor 27, etc.) is input to the engine control device 28 via the work implement control device 26. It is like that.

  As described above, in the second embodiment, the engine control device 28 includes the automatic regeneration mode 30 and the semi-automatic regeneration mode 31, but switching between the automatic regeneration mode 30 and the semi-automatic regeneration mode 31, the semi-automatic regeneration mode 31. If there is no command from the work machine control device 26 such as the second stage temperature rise in the automatic regeneration mode 30 or the DPF regeneration stop in the automatic regeneration mode 30, the respective controls cannot be executed. The control device 26 is configured to be higher than the engine control device 28. In other words, the work machine control device 26 functions as a central device that manages control of DPF regeneration.

In this way, even when the engine control device 28 and the work implement control device 26 are manufactured at different locations, settings relating to DPF regeneration can be easily performed on the work implement control device 26 side.
[Third embodiment]
In the above-described embodiment, the regeneration switch 32, the DPF switch 33, and the external switching unit 41 are configured separately. However, in the third embodiment, the regeneration switch 32, the DPF switch 33, and the external switching unit 41 are combined into one. It consists of switches.

As shown in FIG. 5, the work machine control device 26 is provided with a regeneration switch 32, a DPF switch 33, and a dual-purpose switch 44 that also serves as the external switching unit 41 around the display device 9. The dual-purpose switch 44 is a push button type switch, and has an LED or the like built in, and is lit and blinks.
Hereinafter, the dual-purpose switch 44 will be described in detail.

  When the DPF regeneration is not executed in the automatic regeneration mode 30 or the semi-automatic regeneration mode 31, that is, when the PM accumulation amount accumulated in the DPF 21 is less than the threshold value, the dual-purpose switch 44 functions as the external switching unit 41. For example, when the DPF regeneration is not performed in a state where the PM accumulation amount is very small, when the dual-purpose switch 44 is pressed, a signal indicating switching between the automatic regeneration mode 30 and the semi-automatic regeneration mode 31 is sent to the work machine control device 26. It outputs to the control part 36. When the DPF regeneration is not performed, a signal indicating either the automatic regeneration mode 30 or the semi-automatic regeneration mode 31 is output to the control unit 36 of the work machine control device 26 every time the combined switch 44 is pressed. The switching signal output means 43 outputs a switching signal corresponding to the mode indicated by the dual-purpose switch 44 to the engine control device 28. In addition, it is preferable to perform display (DPF display) on the display device 9 so that the current mode is known.

  On the other hand, when the PM accumulation amount is equal to or greater than the threshold value and the semi-automatic regeneration mode is operating, when the exhaust temperature reaches the first target temperature, the dual-purpose switch 44 blinks, and whether or not the second stage temperature increase control may be performed. It functions as a regeneration switch 32 for confirming the above. When the dual-purpose switch 44 is pressed while the dual-purpose switch 44 is blinking, an external temperature increase command is issued to the engine control device 28 via the work implement control device 26, and the second-stage temperature increase is executed. When the second stage temperature increase is executed, the engine control device 28 outputs a control signal to the dual-purpose switch 44 and lights the dual-purpose switch 44 to notify that DPF regeneration is being performed. In addition, when DPF regeneration is performed in the automatic regeneration mode instead of the semi-automatic regeneration mode, the dual-purpose switch 44 is lit to notify that DPF regeneration is performed. Also, when pressed during DPF regeneration in the automatic regeneration mode, it functions as a DPF switch 33 that stops DPF regeneration.

Thus, by providing the dual-purpose switch 44, the number of parts of the switch can be reduced.
In the third embodiment described above, the regeneration switch 32, the DPF switch 33, and the external switching unit 41 are configured as one dual-purpose switch 44, but the two switches of the regeneration switch 32 and the external switching unit 41 are configured. May be composed of the dual-purpose switch 44, or two switches of the regeneration switch 32 and the DPF switch 33 may be composed of the dual-purpose switch 44.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
In the above embodiment, it is described that the exhaust gas temperature is raised in order to burn the particulate matter in the DPF, but this is substantially the same as the temperature in the DPF in order to burn the particulate matter. There is no problem even if these exhaust temperatures are read as the temperature in the DPF 13 or the water temperature.

The control in the engine control device 28 and the work machine control device 26 is not limited to the above-described one, and various controls may be performed depending on the work machine to be applied. For example, if the work machine is a combine, the control suitable for the combine is performed. If it is a backhoe, control suitable for the backhoe is performed.
In the above-described embodiment, the two-stage method in which the exhaust temperature is raised to the first target temperature and then raised to the second target temperature in the semi-automatic regeneration mode 31 has been described, but until the exhaust temperature reaches the first target temperature, Until the second target temperature is reached, the temperature may be increased in two or more stages, for example, in three or four stages.

  In the automatic regeneration mode 30 and the semi-automatic regeneration mode 31, when the exhaust temperature does not rise sufficiently in a short time, a means for supplementing the increase in the exhaust temperature may be provided in the automatic regeneration mode 30 or the semi-automatic regeneration mode 31. For example, during the temperature increase of the exhaust temperature by the filter regeneration control device 25, an engine rotation increase guide for increasing the engine speed is performed by manual operation, and the operator manually operates the accelerator lever or the like while viewing the engine rotation increase guide. Thus, the engine speed may be increased, and the exhaust temperature may be increased by increasing the engine speed.

  Further, when the PM accumulation amount further increases above the threshold value for executing the automatic regeneration mode 30 or the semi-automatic regeneration mode 31 and the PM accumulation amount increases greatly, first, either the automatic regeneration mode 30 or the semi-automatic regeneration mode 31 is selected. Even when the work machine is stopped, the work machine is stopped (the tractor speed is zero, the parking lever is pulled, the gear is neutral (transmission is neutral), and the engine speed is idle). Alternatively, the DPF regeneration may be forcibly performed by automatically increasing the engine speed and performing throttle or post injection of the intake throttle. Note that when the DPF regeneration is forcibly performed, the DPF regeneration may be executed after the stoppage of the work implement is automatically detected. Further, when the DPF regeneration is forcibly performed, for example, after the operator confirms parking, the DPF regeneration may be started when the regeneration switch 32 or the combined switch 44 is pressed when performing the regeneration of the DPF.

  4 and 5 described above, the engine control device 28 that stores the automatic regeneration mode 30 and the semi-automatic mode is provided with the mode storage unit 42. However, the mode storage unit 42 may be stored in the work implement control device 26. Good. For example, the execution flag corresponding to the mode switched to the mode storage unit 42 of the work implement control device 26 when the mode of the engine control device 28 is switched is stored. The engine control device 28 may move the mode based on the execution flag stored in the mode storage unit 42 of the work machine control device 26.

DESCRIPTION OF SYMBOLS 1 Tractor 2 Traveling vehicle body 3 Diesel engine 4 Transmission device 5 Three-point link mechanism 6 Various working devices 7 Cabin 8 Driver's seat 9 Display device 10 Cylinder 11 Intake port 12 Exhaust port 13 Intake valve 14 Exhaust valve 15 Intake manifold 16 Exhaust manifold 17 Silencer 20 Exhaust gas purification device 21 DPF
25 filter regeneration control device 26 work machine control device 27 temperature sensor 28 engine control device 29 control unit 30 automatic regeneration mode 31 semi-automatic regeneration mode 32 regeneration switch 33 DPF switch 35 switching means 36 control unit 40 internal switching unit 41 external switching unit 42 mode Storage unit 43 Switching signal output means

Claims (6)

An exhaust gas purifying device having a filter for collecting particulate matter contained in exhaust gas discharged from a diesel engine, and the amount of particulate matter deposited on the filter of the exhaust gas purifying device is a predetermined value or more A filter regeneration control device that sometimes burns and removes the particulate matter,
The filter regeneration control device automatically raises the exhaust temperature in the exhaust gas purification device toward a combustion temperature range in which combustion of particulate matter promotes when the accumulation amount is a predetermined value or more. Switching means for switching between an automatic regeneration mode for burning the particulate matter, a semi-automatic regeneration mode for raising the exhaust temperature to the combustion temperature range based on an external temperature raising command, and the automatic regeneration mode and the semi-automatic regeneration mode A working machine characterized by that.   2. The work machine according to claim 1, wherein the switching unit switches between an automatic regeneration mode and a semi-automatic regeneration mode based on a switching signal inside the filter regeneration control device.   2. The work machine according to claim 1, wherein the switching unit switches between an automatic regeneration mode and a semi-automatic regeneration mode based on a switching signal external to the filter regeneration control device. The filter regeneration control device includes an engine control unit that can raise the exhaust temperature by performing temperature rise control for raising the temperature of the diesel engine, and a work implement control unit that performs work-related control.
The engine control unit performs the temperature increase control to increase the temperature toward the combustion temperature range, waits for the external temperature increase command in the middle of the temperature increase control, and receives the external temperature increase command. Further comprising the switching means for switching between the semi-automatic regeneration mode in which the temperature rise control is further performed to raise the temperature toward the combustion temperature range, and the automatic regeneration mode and the semi-automatic regeneration mode,
The work implement according to claim 2, wherein the work implement control unit includes a switching signal output unit that outputs the switching signal to the engine control unit.   The work machine according to any one of claims 1 to 4, wherein the filter regeneration control device includes a mode storage unit that stores an execution flag for executing a mode switched by the switching signal. .   The work machine according to any one of claims 1 to 5, wherein a regeneration switch for performing the external temperature raising command is installed on a front side of a driver's seat.

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