JP5622696B2 - Working machine - Google Patents

Description

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

In order to improve and solve environmental problems in recent years, exhaust gas regulations for diesel engines and the like have been strengthened. In working machines such as construction machines and agricultural machines, various techniques for reducing particulate matter (particulates) contained in exhaust gas have been developed in order to cope with such exhaust gas regulations.
In general, diesel engines are provided with an exhaust gas purification device that collects particulate matter contained in the exhaust gas. The exhaust gas purification device collects particulate matter by passing the exhaust gas through a diesel particulate filter (DPF) provided therein. Since the collected particulate matter gradually accumulates in the DPF of the exhaust gas purification device, the particulate matter is appropriately removed to prevent the DPF from becoming clogged and increasing the air resistance of the exhaust system. I have to play it.

As techniques relating to such DPF regeneration, there are techniques shown in Patent Document 1 and Patent Document 2.
Japanese Patent Application Laid-Open No. 2005-228561 is a technology for automatically stopping an engine when regeneration is completed by performing throttle of an intake throttle (throttle of an intake / exhaust valve) or post injection in a DPF regeneration process in a common rail diesel engine.

  Patent Document 2 is a technique for determining the clogging of the DPF based on the operating state of the engine during the operation of the construction machine and regenerating the DPF without stopping the engine when the DPF is clogged.

JP 2010-127253 A JP 2010-270611 A

  Patent Document 1 and Patent Document 2 also operate the engine to regenerate the DPF, but these techniques reduce the amount of DPF accumulated (PM accumulated) in the DPF regeneration processing (regeneration operation). This is a technology that focuses only on this. In other words, in these technologies, although the process of reducing the PM deposition amount by the regeneration operation of the DPF is actively performed, it is actually not considered that the processing is performed so that the PM deposition amount does not increase. It is.

  Therefore, the present invention efficiently regenerates a filter such as DPF to reduce the deposition amount (PM deposition amount), and also increases the amount of particulate matter deposited on the DPF (PM deposition amount). An object is to provide a work machine that can be suppressed.

In order to achieve the above object, the present invention has taken the following measures.
That is, the technical means for solving the problems in the present invention include an exhaust gas purification device including a filter that collects particulate matter contained in exhaust gas discharged from a diesel engine, and a filter of the exhaust gas purification device. A working machine comprising filter regeneration means for burning and removing particulate matter deposited on the vehicle, and boarding confirmation means for confirming boarding, wherein the engine is operating and the boarding confirmation is confirmed by the boarding confirmation means In this state, the regeneration permitting means for permitting the regeneration operation for burning and removing the particulate matter by the filter regeneration means, and the state in which the engine is operating and the boarding confirmation means cannot confirm the boarding Is provided with a deposition suppressing means for suppressing an increase in the amount of particulate matter deposited on the filter by stopping the engine. .

Preferably, the accumulation suppressing means stops the engine when a state in which the engine is operating and the boarding is not confirmed continues for a predetermined time.
The accumulation suppressing means preferably stops the engine when the accumulation amount tends to increase in a state where the engine is operating and the boarding is not confirmed.
It is preferable that the filter regeneration means has an automatic regeneration mode in which the regeneration operation is automatically performed when the amount of particulate matter deposited on the filter becomes a predetermined value or more.

The filter regeneration means is an output restriction mode for restricting the output to the diesel engine when the automatic regeneration mode is being executed and further when the accumulation amount tends to increase compared to before the automatic regeneration mode. It is preferable to provide.
It said filter regeneration means preferably comprises a reproducing operation supplemental mode for informing prompting the increasing the rotation speed of the diesel engine to the operator as a supplement to the reproduction operation.

It is preferable that the engine can be restarted after the engine is stopped by the accumulation suppressing means.
The most preferable technical means of the present invention includes an exhaust gas purification device having a filter for collecting particulate matter contained in exhaust gas discharged from a diesel engine, and particulate matter deposited on the filter of the exhaust gas purification device. A working machine comprising filter regeneration means for burning and removing a substance, and boarding confirmation means for confirming boarding, in a state in which the engine is operating and the boarding is confirmed by the boarding confirmation means, A regeneration permission means for permitting a regeneration operation to burn and remove the particulate matter by the filter regeneration means, and a case where the accumulation amount tends to increase in a state where the engine is operated and the boarding is not confirmed. And a deposition suppressing means for suppressing an increase in the amount of particulate matter deposited on the filter by stopping the engine. Features.

According to the first aspect, the filter such as DPF is efficiently regenerated to reduce the deposition amount (PM deposition amount), and further, the amount of particulate matter deposited on the DPF (PM deposition amount) is increased. Can also be suppressed.
According to claim 2, for example, an increase in the amount of accumulated PM when the worker has left the engine for a long time (resting cannot be confirmed) with the engine running to take a break or temporarily suspend the work. Can be suppressed (prevented).

According to the third aspect of the present invention, for example, the engine can be stopped only when the worker is getting off and the PM accumulation amount tends to increase, and the increase in the PM accumulation amount can be suppressed.
According to the fourth aspect, the particulate matter can be automatically burned to reduce the PM deposition amount.
According to the fifth aspect, it is possible to suppress a significant increase in the amount of accumulated PM.

According to the sixth aspect of the present invention, by prompting the operator to increase the engine speed, the exhaust temperature is increased by manually increasing the engine speed, so that regeneration of the DPF can be promoted.
According to the seventh aspect, even if the engine is forcibly stopped, the engine can be started again and work can be temporarily performed.

It is a figure which shows the structure of the exhaust gas purification apparatus in 1st Embodiment. It is a figure which shows transition (change) of PM deposition amount. It is a figure which shows the structure of the exhaust gas purification apparatus in 2nd Embodiment. It is the whole backhoe side view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[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 work machines include construction machines such as backhoes and compact truck loaders (CTLs), and agricultural machines such as tractors. As described below, backhoes will be described as examples of work machines.

FIG. 4 is a side view showing the overall configuration of the backhoe 1. As shown in FIG. 4, the backhoe 1 includes a lower traveling device 2 and an upper swing body 3.
The traveling device 2 is a crawler traveling device including a pair of left and right traveling bodies 4 each having a rubber cover. A dozer 5 is provided at the front of the traveling device 2.
The swivel body 3 includes a swivel base 7 supported on the traveling device 2 via a swivel bearing 6 so as to be turnable left and right around a swivel axis in the vertical direction, and a working device 8 (excavation) provided at the front of the swivel base 7. Device). On the swivel base 7, a diesel engine 9, a radiator, a driver's seat 10, a fuel tank, a hydraulic oil tank, a control valve for controlling hydraulic oil from the hydraulic oil tank, and the like are provided. Around the driver's seat 10, a display device 11 that displays various information about the backhoe 1 is provided. The driver's seat 10 is surrounded by a cabin 12 provided on the turntable 7.

  The work device 8 includes a swing bracket 14 supported by a support bracket 13 provided at the front portion of the swivel base 7 so as to be swingable left and right, and a boom having a base side supported by the swing bracket 14 so as to be swingable up and down. 15. An arm 16 is supported on the front end side of the boom 15 so as to be swingable back and forth, and a bucket 17 is provided on the front end side of the arm 16 so that a squeeze / dump operation can be performed.

  The swing bracket 14 is swung by expansion and contraction of a swing cylinder provided in the swivel base 12. The boom 15 is swung by the expansion and contraction of a boom cylinder 18 interposed between the boom 15 and the swing bracket 14. The arm 16 is swung by the expansion and contraction of an arm cylinder 19 interposed between the arm 16 and the boom 15. The bucket 17 is squeezed and dumped by expansion and contraction of the bucket cylinder 20 interposed between the bucket 17 and the arm 16.

Each of the swing cylinder, the boom cylinder 18, the arm cylinder 19, and the bucket cylinder 20 is configured to expand and contract with hydraulic oil whose flow rate is controlled by a control valve.
FIG. 1 shows the structure of a diesel engine and the exhaust system of the diesel engine. The exhaust system of the diesel engine will be described. Although the diesel engine 9 is often a multi-cylinder engine having a plurality of cylinders (cylinders), FIG. 1 shows and describes the configuration of only one of the cylinders 34.

  As shown in FIG. 1, an intake port 35, which is an opening for introducing air into the cylinder 34, is formed at the upper part of the cylinder 34 of the diesel engine 9, and gas after combustion (combustion gas) is An exhaust port 36 that is an opening for discharging from the cylinder 34 is formed. Further, an intake valve 37 for opening and closing the intake port 34 and an exhaust valve 38 for opening and closing the exhaust port 36 are provided at the upper part of the cylinder 34.

  The intake port 35 is connected to a tubular intake manifold 39 that serves as a flow path for air introduced into the cylinder 34. The exhaust port 36 is connected to a tubular exhaust manifold 30 serving as a flow path for combustion gas discharged from the cylinder 34. A silencer 40 for reducing exhaust noise is provided at the end of the exhaust manifold 30, and the combustion gas passes through the silencer 40 and is discharged into the environment.

  In the exhaust manifold 30, an exhaust gas purification device 31 is provided between the exhaust port 36 and the silencer 40. The exhaust gas purification device 31 collects and purifies particulate matter (PM) contained in the exhaust gas passing therethrough. That is, the combustion gas discharged from the cylinder 34 through the exhaust port 36 becomes exhaust gas, passes through the exhaust manifold 30, is purified by the exhaust gas purification device 31, and reaches the silencer 40.

  This exhaust gas purification device 31 has a diesel particulate filter (DPF) 41 inside. The DPF 41 is a filter for collecting particulate matter (PM) contained in the exhaust gas. For example, the DPF 41 is made of ceramic and has a cross section having a honeycomb structure. In other words, a number of hexagonal column-shaped polygonal through holes are adjacent to each other along the longitudinal direction from one end to the other end of the DPF 41, and each through hole has a predetermined interval along the longitudinal direction of the DPF 41. A porous partition is provided. The DPF 41 having such a honeycomb structure is configured such that the position of the partition wall formed in the through hole in the longitudinal direction of the DPF 41 is different from the position of the partition wall formed in the adjacent through hole.

The exhaust gas that has entered from one end of the DPF 41 flows toward the other end of the DPF 41 while passing through a porous partition formed in the through hole. Particulate matter contained in the exhaust gas is collected and deposited on the DPF 41 by adhering to the porous partition walls or adhering to the inner walls of the through holes. That is, since the DPF 41 has a structure that causes clogging when the amount of accumulated particulate matter increases, the DPF 41 must be appropriately cleaned so that the amount of particulate matter deposited does not become excessive.

In the present embodiment, this cleaning of the DPF 41 is referred to as “DPF regeneration”, and the operation for that purpose is referred to as “DPF regeneration operation”. In the regeneration of the DPF 41, the particulate matter deposited by burning the DPF 41 to a predetermined temperature or higher is combusted and gasified, and discharged into the environment together with the exhaust gas.
In addition to the DPF 41, the exhaust gas purification device 31 includes an oxidation catalyst for oxidizing the fuel in the particulate matter and the nitrogen oxide in the combustion gas, although not shown.

  An inlet side pressure sensor 42 that detects the exhaust pressure near the inlet of the exhaust gas cleaner 31 is provided on the inlet side of the exhaust gas cleaner 31, and an outlet pressure sensor that detects the exhaust pressure near the outlet on the outlet side. 43 is provided. The entry-side pressure sensor and the exit-side pressure sensor are general pressure sensors composed of, for example, piezoelectric elements. The inlet pressure sensor and the outlet pressure sensor are connected to a differential pressure sensor described below.

  The differential pressure sensor 44 is the difference between the exhaust pressure detected by the inlet pressure sensor and the exhaust pressure detected by the outlet pressure sensor. Is detected. In general, when the particulate matter is not deposited on the DPF 41 and is not clogged, the pressure loss due to the DPF 41 is small. Therefore, the difference between the exhaust pressure detected by the inlet pressure sensor and the outlet pressure sensor is small. The differential pressure detected by the is also a small value. However, when particulate matter accumulates on the DPF 41 and the degree of clogging increases, the pressure loss due to the DPF 41 increases, so the differential pressure detected by the differential pressure sensor also increases. Since the magnitude of the differential pressure corresponds to the degree of clogging of the DPF 41, the magnitude of the differential pressure can be converted into the degree of clogging of the DPF 41, that is, the amount of particulate matter accumulated in the DPF 41.

As shown in FIG. 1, the exhaust manifold 30 that connects the diesel engine 9 and the exhaust gas purification device 31 detects the temperature (exhaust temperature) of the combustion gas that is exhausted from the diesel engine 9 and travels toward the exhaust gas purification device 31. An exhaust temperature sensor 45 is provided. The exhaust temperature sensor is composed of, for example, a thermistor.
The differential pressure detected by the differential pressure sensor as described above and the exhaust temperature detected by the exhaust temperature sensor are sent to the control unit 46, and the control unit 46 performs control for regenerating the DPF. The DPF regeneration control will be described later.

  The control unit 46 controls the entire backhoe 1 in addition to control for regeneration of the DPF. This control part 46 is comprised from several control apparatus (ECU), for example, has engine ECU32 which controls the diesel engine 9, and main ECU33 which controls operation | movement of the backhoe 1 whole. The engine ECU 32 and the main ECU 33 are composed of, for example, a CPU.

  The engine ECU 32 obtains information from sensors installed at various locations of the diesel engine 9 and the power transmission system, and calculates the optimal fuel injection amount, injection timing, ignition timing, idle speed, etc. according to the state of the diesel engine 9. The control command is issued to the diesel engine 9 or the like. As a matter of course, in the diesel engine 9, the engine speed can be increased by operating an accelerator lever provided around the driver's seat 10 (by performing an accelerator operation).

  The sensors that provide information to the engine ECU 32 include an accelerator opening sensor that detects the accelerator opening, a differential pressure sensor 44 that detects the differential pressure of the exhaust gas purification device 31, an exhaust temperature sensor 45 that detects the exhaust temperature, and intake air. There are an air flow meter for detecting the amount, a crank position sensor for detecting the engine speed, a water temperature sensor for detecting the coolant temperature, a throttle position sensor for detecting the opening of the valve, and the like. In addition to these, there are a cam position sensor for detecting the crank position, an oxygen concentration sensor for detecting the oxygen concentration in the intake air, and the like.

The main ECU 33 controls various devices (traveling device, working device, etc.) provided in the backhoe 1 in cooperation with the engine ECU 32. For example, the main ECU 33 performs flow control for supplying predetermined hydraulic oil to each cylinder such as the swing cylinder, the boom cylinder 18, the arm cylinder 19, and the bucket cylinder 20.
This flow rate control is performed based on the amount of operation of an operating member (operating lever) 47 provided around the driver's seat 10. Specifically, the operating lever 47 is swung to one side (left side) from the neutral position. When the operation amount on the left side is input, a current (operation signal) of a predetermined value is output to the solenoid of the electromagnetic proportional valve corresponding to the operated actuator (swing cylinder, boom cylinder 18, arm cylinder 19 and bucket cylinder 20). Then, the electromagnetic proportional valve opens according to the current value, the pilot pressure of the control valve corresponding to the operated actuator is controlled, and the actuator operates in one direction. When the operation lever 4733 is swung from the neutral position to the opposite side to input the operation amount on the right side, the actuator is operated on the opposite side from the swinging to the left side. Thus, the backhoe 1 can be operated by operating the operation lever 47.

In this manner, the backhoe 1 can be operated by controlling the diesel engine 9 by the engine ECU 32 and controlling various devices such as a work device by the main ECU 33. It should be noted that the control by the engine ECU 32 and the main ECU 33 is not limited to the above.
As described above, the control unit 46 also performs control for regenerating the DPF. Hereinafter, the regeneration of the DPF will be described in detail.

The control unit 46 is provided with filter regeneration means 50 that regenerates the DPF 41 of the exhaust gas purification device 31. Specifically, the filter regeneration unit 50 is provided in the main ECU 33 that constitutes the control unit 46, and the filter regeneration unit 50 is configured by a program or the like stored in the main ECU 33.
When the amount of particulate matter deposited on the DPF 41 (referred to as PM deposition amount) exceeds a predetermined amount (above a threshold value), the filter regeneration means 50 burns and removes the particulate matter deposited on the filter. The engine 9 and the exhaust gas purification device 31 are controlled to automatically perform processing (regeneration operation) for reducing the accumulation amount. That is, as shown in FIG. 2, when the PM accumulation amount is equal to or greater than a predetermined threshold value, the filter regeneration means 50 starts the automatic regeneration mode and starts control of regeneration of the DPF.

In this automatic regeneration mode, the intake air throttle of the diesel engine 9 is throttled to raise the exhaust temperature to burn particulate matter, or by injecting fuel into the burned gas “Post-injection” is performed in which particulate matter is burned by raising the exhaust temperature.
Further, when the filter regeneration means 50 is in the stage of executing the automatic regeneration mode and when the PM accumulation amount is increasing gradually, an output restriction mode for restricting the output of the diesel engine 9 is set. It is supposed to start.

As shown in FIG. 2, after the automatic regeneration mode is started, when the PM accumulation amount has increased within a predetermined time (when the PM accumulation amount transition line is rising), the output restriction mode Work.
For example, when the PM accumulation amount is calculated every 10 seconds after the start of the automatic regeneration mode, and the calculated PM accumulation amount every 10 seconds is continuously increased, the PM accumulation amount at the start of the automatic regeneration mode is If the PM deposition amount after 60 seconds is large compared with the PM deposition amount after 60 seconds, a transition line is created by plotting the PM deposition amount every few seconds, and the slope of the transition line is positive (PM deposition amount In the case where the transition line of () rises to the right), the PM accumulation amount is considered to be increasing, and the output restriction mode is activated.

  When the output restriction mode is activated, the engine ECU 32 is instructed to limit the horsepower that restricts the maximum output of the diesel engine 9 to a predetermined value or less (for example, 50% or less of the specified maximum output). In this output restriction mode, the increase in the PM accumulation amount by the engine 9 is suppressed as much as possible while continuing the reduction of the PM accumulation amount by the automatic regeneration mode. That is, in the output restriction mode, the PM accumulation amount is reduced by the regeneration operation (decreased by combustion) and the increase of the PM accumulation amount is suppressed by suppressing the operation of the engine 9 (suppressing the amount of exhaust gas). An increase in the amount of accumulated PM is suppressed.

In this way, by performing the regeneration operation of the DPF by the filter regeneration means 50, DF
Although the PM accumulation amount of P can be reduced, in the present invention, the regeneration permitting means 51 for permitting the regeneration operation of the DPF by the filter regeneration means 50 is provided.
The regeneration permission means 51 permits the regeneration operation by the filter regeneration means 50 in a state where the worker is on the backhoe (work machine) 1, that is, in a state where the worker has been boarded. Similar to the filter regeneration means 50, it is constituted by a program stored in the main ECU 33 or the like.

More specifically, first, the backhoe 1 is provided with boarding confirmation means 52 for checking whether or not an operator is on the backhoe 1.
This boarding confirmation means 52 has a lever that is swingably supported on the side of the driver's seat 10, and the operator is on board when the boarding port is shut off by turning the lever 52 sideways (boarding). When the lever 52 is raised (standing up) and the boarding port is not shut off, the operator is not in the boarding state (alighting state). In the boarding confirmation means 52, a signal indicating whether the worker is in a boarding state or a boarding state, that is, a signal indicating whether the lever 52 is lying sideways or the lever 52 is raised is input to the main ECU 33.

Here, the regeneration permitting means 51 permits the automatic regeneration by the filter regeneration means 50 when the engine 9 is in operation and is in a boarding state.
More specifically, first, when the operator gets into the driver's seat 10 with the lever 52 raised, and then the lever 52 is laid down and the engine 9 is started, the regeneration permitting means 51 performs regeneration by the filter regeneration means 50. Enable operation. When the PM regeneration amount exceeds a threshold value when the filter regeneration means 50 is in the permitted state, the filter regeneration means 50 activates an automatic regeneration mode or an output restriction mode, and performs “intake throttle throttling” or “post injection”. Regenerate the DPF. Therefore, when the operator gets on the backboard 1 and the operator moves the operation lever 47 to perform work, the DPF can be automatically regenerated.

  Here, the operator may temporarily stop the operation of the operation lever 47 and get off from the backhoe 1, and get on the backhoe 1 again to restart the operation. Therefore, in the present invention, the permission state by the regeneration permission means 51 is such that even if the worker temporarily gets off, the permission state is not released immediately, and the work is performed while repeatedly performing boarding → getting off → boarding. Even when it is performed, the permission state is maintained. For example, after the engine 9 is started, until the engine 9 is stopped, the permission state is maintained even if the operator repeatedly gets on and off the vehicle, and the permission state by the regeneration permission means 51 is automatically set when the engine 9 is stopped. Is released.

  As described above, in the backhoe 1 of the present invention, the DPF regeneration by the filter regeneration means 50 can be performed. However, the particulate matter deposited on the DPF is deposited separately from the operation for regenerating the DPF. Deposition suppression means 54 for suppressing an increase in the amount is provided. Similar to the filter regeneration means 50, the accumulation suppression means 54 is configured by a program stored in the main ECU 33.

The accumulation suppressing means 54 suppresses an increase in the amount of particulate matter deposited on the DPF by forcibly stopping the engine 9. Since there are a plurality of engine stop patterns by the accumulation suppressing means 54, they will be described in order. Note that the deposition suppressing means 54 provided in the backhoe 1 may be any one that performs any one of the following patterns.
The accumulation suppressing means 54 in the first pattern stops the engine 9 when the engine 9 is operating and the operator's getting-off state continues for a predetermined time (for example, 60 seconds). Specifically, the accumulation suppression means 54 is in a state where a signal indicating that the rider confirming that the boarding confirmation means 52 does not get on is input to the main ECU 33 (engine operation). When the unloading state continues for 60 seconds or more, an engine stop signal is output to the engine ECU, and the engine 9 is forcibly stopped. Note that the duration of the unloading state for determining whether the engine is stopped by the accumulation suppressing means 54 (the predetermined time) is set according to the workability of the backhoe 1 or the increase in the PM accumulation amount when the engine 9 is left in operation. Of course, as described above, it is not limited to 60 seconds. For example, the predetermined time may be 300 seconds. Moreover, you may enable it to set arbitrarily the time length of an alighting state by operating the display apparatus 11. FIG.

  The accumulation suppression means 54 in the second pattern stops the engine 9 when the PM accumulation amount tends to increase when the engine 9 is operating and the operator is getting off. Specifically, the accumulation suppression unit 54 monitors the transition of the PM accumulation amount when the engine is getting off. Then, as shown in FIG. 2, when the PM accumulation amount transition line rises to the right after the engine 9 is started, the accumulation suppression means 54 outputs an engine stop signal to the engine ECU. Is forcibly stopped.

As described above, by providing the deposition suppressing unit 54 separately from the filter regeneration unit 50, it is possible to prevent an inadvertent increase in the PM deposition amount.
For example, in order to warm up the backhoe 1 (warm-up operation), an operator gets on the backhoe 1 and starts the engine 9, then gets off the backhoe 1 and the worker may take a break. If the operator forgets that the backhoe 1 is warming up and continues to rotate the engine 9 at the idling speed, the PM deposition amount may gradually increase.

In the first pattern accumulation suppression means 54, the engine 9 is automatically stopped when the engine operation drop-off state continues for 60 seconds, so that the PM accumulation amount increases by forgetting that the operator is warming up. Can be prevented from an early stage.
In addition, the second pattern accumulation suppression means 54 automatically stops the engine 9 when the PM accumulation amount tends to increase while the engine is getting off, so that the worker is warming up. It is possible to prevent the PM accumulation amount from increasing due to forgetting. In particular, in the pattern 2 accumulation suppressing means 54, the engine 9 is stopped when the PM accumulation amount is actually increasing, so that warm-up time can be secured as much as possible.

  Further, as described above, after an operator gets on and performs an operation, the operator may get off with the engine 9 running and then get on again. It takes a long time for the operator to get off the vehicle with the engine 9 running and to get on again, which may increase the amount of accumulated PM. Even in such a case, since the engine 9 is stopped by the accumulation suppressing means 54, it is possible to prevent an increase in the PM accumulation amount after the operator gets off the vehicle.

  Note that, as described above, when getting off the vehicle due to warm air from the backhoe 1 or temporarily getting off during work, the accumulation of the engine 9 is suppressed under a situation where the engine 9 continues to operate and the PM accumulation amount is increasing. Although the engine 9 is stopped by the means 54, after the engine is stopped by the accumulation suppressing means 54, when the operator gets on and starts the engine 9 again, the engine 9 is driven by the accumulation suppressing means 54. Prior to restarting regardless of the stoppage. Even after the engine 9 is restarted, the engine 9 is stopped when the conditions for stopping the engine 9 by the deposition suppressing means 54 are met again.

In the embodiment described above, the filter regeneration means 50 has the automatic regeneration mode and the output restriction mode. However, the filter regeneration means 50 has a regeneration operation supplement mode in addition to the automatic regeneration mode and the output restriction mode. May be.
In the regeneration operation supplement mode, when the regeneration operation is performed by performing the throttle of the intake throttle or the post injection, the engine 9 is increased to increase the exhaust temperature separately from these operations.

  Specifically, when the reproduction operation by the filter reproduction unit 50 is permitted and the automatic reproduction mode is activated by the filter reproduction unit 50, the reproduction operation supplement mode is also activated. If it does so, the alerting | reporting screen which alert | reports raising the rotation speed of the engine 9 is displayed on the display apparatus 11 by starting of reproduction | regeneration operation supplement mode. When the operator gets on the vehicle, he can see a notification screen prompting the engine 9 to rise. For example, the operator manually increases the engine speed by operating an accelerator lever that increases the engine speed. Can do. When the engine speed increases, the exhaust temperature increases, and the regeneration of the DPF in the automatic regeneration mode is promoted.

In the regeneration operation supplement mode, the engine speed is not increased automatically but manually by the operator operating the accelerator lever. The operator can freely perform a supplementary operation (increase in engine speed) for the regeneration of the DPF, and can reduce troublesomeness such as an operation being disturbed by the regeneration of the DPF.
For example, when the operator performs a supplementary operation for DPF regeneration (increase in engine speed), first, when the operation with the operation lever 47 is being performed, the operation with the operation lever 47 is continued and the operation with the operation lever 47 is continued. After a while, the engine speed can be increased by operating the accelerator lever. For the operator, the operation of the operation lever 47 is not disturbed by the regeneration of the DPF, so the operability is reduced. The regeneration of the DPF can be promoted without causing it to occur.
[Second Embodiment]
In the first embodiment, the filter regeneration means 50 automatically regenerates when the PM accumulation amount exceeds a threshold value, and automatically performs a regeneration operation. However, the filter regeneration means 50 of the second embodiment manually regenerates instead of automatically. It is what makes it work In addition, description is abbreviate | omitted about the part with the same structure as 1st Embodiment.

  FIG. 3 shows the configuration of the exhaust gas purifying apparatus in the second embodiment. As shown in FIG. 3, the main ECU 33 is connected to a regeneration switch 55 for instructing a regeneration operation by the filter regeneration means 50. This regeneration switch 55 is, for example, a push button type, and when it is necessary to perform a regeneration operation by the filter regeneration means 50, a backlight composed of LEDs or the like is lit or blinked. When is pressed, the filter regeneration means 50 is instructed to perform a regeneration operation.

  In this embodiment, the regeneration permitting means 51 permits the regeneration operation by the filter regeneration means 50 when the boarding confirmation means 52 confirms the boarding (boarding state). Then, the filter regeneration means 50 turns on the backlight for the regeneration switch 55 or presses the regeneration switch 55 when the regeneration amount is required because the PM accumulation amount exceeds the threshold value and the regeneration operation is required. Prompt.

  When the operator notices that the regeneration switch 55 has flashed or lit and presses the regeneration switch 55, the filter regeneration means 50 starts control of regeneration of the DPF in response to an instruction by manual operation of the regeneration switch 55 (the throttle of the intake throttle). Or start post-injection). When the regeneration switch 55 is not lit or blinking, that is, when there is no need for the regeneration operation by the filter regeneration means 50, the regeneration operation by the filter regeneration means 50 is not performed even if the regeneration switch 55 is pressed. It has become.

Thus, when the operator presses the regeneration switch 55, the regeneration operation by the filter regeneration means 50 can be performed. Even in such a case, when the operator has been getting off for a long time, such as during warming up of the backhoe 1, the engine 9 is stopped by the accumulation suppressing means 54, so that an increase in the PM accumulation amount can be suppressed. .
Note that, as a condition for the operation of the accumulation suppression means 54, when the engine 9 is operating with the operator getting off and the regeneration operation is being performed by the filter regeneration means 50 (regeneration pattern), the operator gets off the vehicle. It can be considered that the reproduction operation is not performed by the filter regeneration means 50 in the state (non-reproduction pattern), but the accumulation suppression means 54 may be a reproduction pattern or an unreproduction pattern, When the engine 9 is operating in the getting-off state, the engine 9 may be stopped in order to suppress an increase in the PM accumulation amount. Moreover, you may add conditions to the stop of the engine 9 as follows.

For example, in the case of a non-regenerated pattern, the engine 9 is stopped by the accumulation suppressing means 54 when a predetermined time elapses or the PM accumulation amount tends to increase. Then, the engine 9 may be stopped, or the engine 9 may be stopped when the PM accumulation amount tends to increase even during the regeneration operation.
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 automatic regeneration, whether to perform “throttle throttle” or “post injection” may be set as appropriate, and is not limited to the above. For example, the intake throttle may be initially throttled and then post injection may be performed, or only post injection may be performed.
In the above-described embodiment, the boarding confirmation means 52 is constituted by a lever provided around the driver's seat 10 and is used for confirming the boarding state and the getting-off state of the operator by the lever 52. The lever used in the lever lock structure shown may also be used as the above-mentioned boarding confirmation means.

  In the case of a work machine such as the backhoe 1, if the operator does not get on the backhoe 1 and the operation lever 47 moves, the actuator will be inadvertently operated. Therefore, a lever lock structure is used to prevent this. Is provided. In this lever lock structure, a lever locking lever is provided for confirming boarding by swinging in the same manner as the lever 52 described above. When the lever locking lever is lying on its side, Oil supply is allowed, and when the lever for locking the lever is standing and getting off the vehicle, supply of hydraulic oil to the actuator is permitted. You may use the lever for lever locking used for this lever lock mechanism as a boarding confirmation means mentioned above.

  Further, a pressure sensor may be provided in the seat portion or backrest portion of the driver's seat, and this pressure sensor may be used as the boarding confirmation means. In this case, when the pressure sensor is working to detect the pressure, the boarding state is entered, and when the pressure sensor is not detecting the pressure, the boarding state is entered. In addition, the boarding confirmation means may confirm boarding with a camera in addition to the lever and the sensor.

DESCRIPTION OF SYMBOLS 1 Backhoe 2 Traveling device 3 Revolving body 4 Traveling body 5 Dozer 6 Swivel bearing 7 Swivel stand 8 Working device 9 Diesel engine 10 Driver's seat 10
DESCRIPTION OF SYMBOLS 11 Display apparatus 12 Cabin 13 Support bracket 14 Swing bracket 15 Boom 16 Arm 17 Bucket 18 Boom cylinder 19 Arm cylinder 20 Bucket cylinder 30 Exhaust manifold 31 Exhaust gas purification apparatus 32 Engine ECU
33 Main ECU
34 Cylinder 35 Intake port 36 Exhaust port 37 Intake valve 38 Exhaust valve 39 Intake manifold 40 Silencer 41 DPF
42 Inlet pressure sensor 43 Outlet pressure sensor 44 Differential pressure sensor 45 Exhaust temperature sensor 46 Control unit 47 Operation lever 50 Filter regeneration means 51 Regeneration permission means 52 Boarding confirmation means 54 Deposition control means 55 Regeneration switch

Claims (5)

Exhaust gas purification device having a filter for collecting particulate matter contained in exhaust gas discharged from a diesel engine, and filter regeneration means for burning and removing particulate matter deposited on the filter of the exhaust gas purification device And a working machine equipped with boarding confirmation means for checking boarding,
Regeneration permitting means for permitting the filter regeneration means to perform a regeneration operation in which the particulate matter is burned and removed by the filter regeneration means in a state where the engine is operating and the boarding confirmation means is confirmed;
When the amount of the deposition on the increase in a state in which the engine is not confirmed is and the boarding operation, and suppressing deposition suppression means an increase in the accumulation amount of particulate matter deposited in the filter the engine is stopped A working machine characterized by comprising:   The filter regeneration means has an automatic regeneration mode in which the regeneration operation is automatically performed when the amount of particulate matter deposited on the filter reaches a predetermined value or more. The working machine according to 1.   The filter regeneration means is an output restriction mode for restricting the output to the diesel engine when the automatic regeneration mode is being executed and further when the accumulation amount tends to increase compared to before the automatic regeneration mode. The working machine according to claim 2, further comprising: The said filter regeneration means is equipped with the reproduction | regeneration operation supplement mode which performs the alerting | reporting which encourages an operator to raise the rotation speed of the said diesel engine as a supplement of the said reproduction | regeneration operation | movement. The working machine described in.   The work machine according to any one of claims 1 to 4, wherein the work implement is configured so that the engine can be restarted after the engine is stopped by the accumulation suppressing means.

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