Working machine

• US 9,534,551 B2
• Filed: 09/13/2012
• Issued: 01/03/2017
• Est. Priority Date: 09/27/2011
• Status: Active Grant

• Current Assignee: Kubota Corporation
• Original Assignee: Kubota Corporation
• Inventors: Soejima, Masaru, Miura, Keisuke, Nakagawa, Hiroaki, Kinugawa, Ryosuke, Matsumoto, Atsushi, Kunizawa, Teruo, Uotani, Ikuhiro, Tajima, Satoshi
• Primary Examiner(s): Bradley, Audrey K
• Assistant Examiner(s): AYALA DELGADO, ANTHONY
• Application Number:
  US13/613,592
• Publication Number:
  US 20130074481A1
• Time in Patent Office: 1,573 Days
• Field of Search: 602/95, 602/97, 602/99, 602/77
• US Class Current: 1/1
• CPC Class Codes: F01N 2900/1606 Particle filter loading or soot amount
• CPC Class Codes: F01N 3/023 using means for regenerating the filters, e.g. by burning trapped particles by electrically controlling the supply of combustible mixture or its constituents only F02D41/0235
• CPC Class Codes: F01N 9/002 of filter regeneration, e.g. detection of clogging
• CPC Class Codes: F02D 2041/227 Limping Home, i.e. taking specific engine control measures at abnormal conditions
• CPC Class Codes: F02D 2041/228 Warning displays
• CPC Class Codes: F02D 2200/021 Engine temperature
• CPC Class Codes: F02D 2200/0812 Particle filter loading
• CPC Class Codes: F02D 2200/604 Engine control mode selected by driver, e.g. to manually start particle filter regeneration or to select driving style
• CPC Class Codes: F02D 31/001 Electric control of rotation speed
• CPC Class Codes: F02D 41/0235 in relation with the state of the exhaust gas treating apparatus control of exhaust gas treating apparatus per se F01N
• CPC Class Codes: F02D 41/0245 by increasing temperature of the exhaust gas leaving the engine
• CPC Class Codes: F02D 41/025 by changing the composition of the exhaust gas, e.g. for exothermic reaction on exhaust gas treating apparatus
• CPC Class Codes: F02D 41/029 the exhaust gas treating apparatus being a particulate filter
• CPC Class Codes: F02D 41/08 for idling F02D41/06, F02D41/16 take precedence
• CPC Class Codes: F02D 41/405 with post injections
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

In a backhoe comprising: a diesel engine able to increase a speed due to an accelerating operation; an exhaust gas cleaning device having a DPF for catching a particulate matter included in an exhaust gas exhausted from the diesel engine; and a filter regeneration means to combust and remove the particulate matter deposited in the DPF of the exhaust gas cleaning device, the filter regeneration means requires to increase the speed of the diesel engine during an automatic regeneration for automatically combusting and removing the particulate matter deposited in the DPF. In this manner, a working machine able to require an operator to increase the speed of the diesel engine at appropriate timing, in order to increase a temperature of the exhaust gas to a temperature required for regeneration of the DPF can be provided.

Claims

1. A working machine comprising:

a diesel engine configured to increase a speed by an accelerating operation;

an exhaust gas cleaning device having a filter for catching a particulate matter included in an exhaust gas exhausted from the diesel engine;

a display device configured to display information related to the working machine; and

a control unit configured to;

control operation of the diesel engine to combust and remove the particulate matter deposited in the filter of the exhaust gas cleaning device and configured to obtain a deposition amount of the particulate matter deposited in the filter of the exhaust gas cleaning device,

perform an automatic regeneration for automatically increasing a temperature of the exhaust gas when the deposition amount obtained by the control unit is equal to or more than a second deposition amount preliminarily determined, thereby automatically combusting and removing the particulate matter deposited in the filter; and

make the display device display a warning when the deposition amount obtained by the control unit is equal to or more than a first deposition amount during the automatic regeneration, the first deposition amount being preliminarily determined and larger than the second deposition amount, the warning requesting the accelerating operation for increasing the speed of the diesel engine.

2. The working machine according to claim 1, wherein the control unit makes the display device display the warning requesting the accelerating operation for increasing the speed of the diesel engine when a temperature related to the diesel engine is equal to or smaller than a first temperature under a state where the automatic regeneration is performed.

3. The working machine according to claim 2, wherein the control unit makes the display device stop displaying the warning when the temperature related to the diesel engine is equal to or more than a second temperature for a predetermined time or more under a state where the displaying is made, the second temperature being higher than the first temperature.

4. The working machine according to claim 1, wherein the control unit makes the display device stop displaying the warning when the deposition amount of the particulate matter becomes equal to or smaller than the second deposition amount under a state where the displaying is made.

5. The working machine according to claim 2, wherein the temperature related to the diesel engine is at least one of an intake temperature, exhaust temperature, and coolant temperature of the diesel engine.

6. The working machine according to claim 3, wherein the temperature related to the diesel engine is at least one of an intake temperature, exhaust temperature, and coolant temperature of the diesel engine.

7. A working machine comprising:

a diesel engine configured to increase a speed by an accelerating operation;

an exhaust gas cleaning device having a filter for catching a particulate matter included in an exhaust gas exhausted from the diesel engine;

a display device configured to display information related to the working machine; and

a control unit configured to control operation of the diesel engine to combust and remove the particulate matter deposited in the filter of the exhaust gas cleaning device and configured to obtain a deposition amount of the particulate matter deposited in the filter of the exhaust gas cleaning device, the control unit including;

a first regeneration control mode for performing an automatic regeneration for automatically increasing a temperature of the exhaust gas when the deposition amount obtained by the control unit of the particulate matter deposited in the filter is equal to or more than a first threshold, thereby automatically combusting and removing the particulate matter deposited in the filter; and

a second regeneration control mode for making the display device display a warning when the deposition amount obtained by the control unit is equal to or more than a second threshold during the automatic regeneration, the second threshold being preliminarily determined and higher than the first threshold, the warning requesting the accelerating operation for increasing the speed of the diesel engine.

8. The working machine according to claim 7, wherein the second regeneration control mode makes the display device display the waring requesting the accelerating operation for increasing the speed of the diesel engine to a predetermined speed or more when the deposition amount of the particulate matter does not become smaller than a warning clearing threshold within a predetermined time from the starting of the automatic regeneration due to the first regeneration control mode, the warning clearing threshold being lower than the first threshold.

9. The working machine according to claim 7, wherein the second regeneration control mode makes the display device display the warning request the accelerating operation for increasing the speed of the diesel engine to a predetermined speed or more when the deposition amount of the particulate matter becomes equal to or more than a second threshold, the second threshold being higher than the first threshold.

10. The working machine according to claim 8, wherein the control unit further includes:

a third regeneration control mode for ordering the diesel engine to output a power limited within a predetermined range when the deposition amount of the particulate matter becomes equal to or more than a third deposition amount threshold under a state where the displaying is made, the third deposition amount threshold being higher than the second deposition amount threshold.

11. The working machine according to claim 9, wherein the control unit further includes:

a third regeneration control mode for ordering the diesel engine to output a power limited within a predetermined range when the deposition amount of the particulate matter becomes equal to or more than a third deposition amount threshold under a state where the displaying is made, the third deposition amount threshold being higher than the second deposition amount threshold.

12. A working machine comprising:

an operator seat;

an exhaust gas cleaning device having a filter for catching a particulate matter included in an exhaust gas exhausted from a diesel engine; and

a control unit configured to;

control the operation of the diesel engine to combust and remove the particulate matter deposited in the filter of the exhaust gas cleaning device, and

confirm boarding to the operator seat,

permit a regenerating operation when confirming the boarding to the operator seat while the diesel engine is in operation, the regenerating operation combusting and removing the particulate matter, and

output a control signal to stop the diesel engine to an engine control unit when failing to confirm the boarding to the operator seat while the diesel engine is in operation, thereby stopping generation of the particulate matter.

13. The working machine according to claim 12, wherein the control unit outputs the control signal to stop the diesel engine when a state continues for a predetermined time, the state being that where the boarding to the operator seat is not confirmed while the diesel engine is in operation.

14. The working machine according to claim 12, wherein the control unit outputs the control signal to stop the diesel engine when a deposition amount of the particulate matter deposited in the filter is in an increasing tendency under a state where the boarding to the operator seat is not confirmed while the diesel engine is in operation.

15. The working machine according to claim 12, wherein the control unit includes an automatic regeneration mode for automatically performing the regenerating operation when the deposition amount of the particulate matter deposited in the filter is equal to or more than a predetermined value.

16. The working machine according to claim 15, wherein the control unit includes an output limitation mode for limiting an output of the diesel engine when the deposition amount is in the increasing tendency, compared to the deposition amount obtained before the automatic regeneration mode, under a state where the automatic regeneration mode is performed.

17. The working machine according to claim 12, wherein the control unit includes a regenerating operation help mode for informing that the speed of the diesel engine is increased as help for the regenerating operation.

18. The working machine according to claim 12, configured to be capable of restarting the diesel engine after the diesel engine is stopped by the control unit.

19. A working machine comprising:

an operator seat;

an exhaust gas cleaning device having a filter for catching a particulate matter included in an exhaust gas exhausted from a diesel engine; and

a control unit configured to;

control the operation of the diesel engine to combust and remove the particulate matter deposited in the filter of the exhaust gas cleaning device,

confirm boarding to the operator seat, and

automatically decrease the speed of the diesel engine when the boarding to the operator seat is not confirmed by the control unit while the diesel engine is in operation and additionally when the deposition amount of the particulate matter deposited in the filter is equal to or more than a predetermined value.

20. The working machine according to claim 19, wherein the control unit decreases the engine speed to zero when the deposition amount is equal to or more than a predetermined value under a state where the engine speed is an idling engine speed while the boarding to the operator seat cannot be confirmed.

21. The working machine according to claim 19, wherein the control unit gradually decreases the engine speed to an idling engine speed and stops the diesel engine to drop the engine speed to zero when the deposition amount is equal to or more than a predetermined value under a state where the engine speed is equal to or more than an idling engine speed while the boarding to the operator seat cannot be confirmed.

22. The working machine according to claim 19, wherein the control unit limits an output of the diesel engine, allowing the increasing and decreasing of the speed of the diesel engine, when the deposition amount of the particulate matter deposited in the filter is equal to or more than a predetermined value under a condition that the boarding to the operator seat is confirmed by control unit while the diesel engine is in operation.

23. The working machine according to claim 19, wherein the control unit informs, in the automatically-decreasing of the speed of the diesel engine, that the speed of the diesel engine is decreased.