WORKING MACHINE

• US 20130074481A1
• Filed: 09/13/2012
• Published: 03/28/2013
• Est. Priority Date: 09/27/2011
• Status: Active Grant

• Current Assignee: Kubota Corporation
• Original Assignee: Ikuhiro Uotani, Keisuke Miura
• Inventors: Nakagawa, Hiroaki, Kinugawa, Ryosuke, Matsumoto, Atsushi, Kunizawa, Teruo, Uotani, Ikuhiro, MIURA, Keisuke, Soejima, Masaru, Tajima, Satoshi
• Granted Patent: US 9,534,551 B2
• Time in Patent Office: Days
• US Class Current: 60/311
• 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 able to increase a speed due to 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; and

a filter regeneration means to combust and remove the particulate matter deposited in the filter of the exhaust gas cleaning device, wherein

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 filter.

2. The working machine according to claim 1, wherein

the filter regeneration means requires to increase the speed of the diesel engine under a state where the automatic regeneration is performed and when a temperature indicator related to the diesel engine is a first temperature or less.

3. The working machine according to claim 2, wherein

the filter regeneration means stops the requirement under a state where the requiring is made and when the temperature indicator related to the diesel engine is a second temperature or more higher than the first temperature for a predetermined time or more.

4. The working machine according to claim 1, wherein

the filter regeneration means requires to increase the speed of the diesel engine under a state where the automatic regeneration is performed and when a deposition amount of the particulate matter becomes a first deposition amount or more.

5. The working machine according to claim 4, wherein

the filter regeneration means stops the requirement under a state where the requiring is made and when the deposition amount of the particulate matter becomes a second deposition amount or less smaller than the first deposition amount.

6. The working machine according to claim 2, wherein

the temperature indicator is at least one of an intake temperature, exhaust temperature, and coolant temperature of the diesel engine.

7. The working machine according to claim 3, wherein

the temperature indicator is at least one of an intake temperature, exhaust temperature, and coolant temperature of the diesel engine.

8. A working machine comprising:

a diesel engine able to increase a speed due to 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; and

a filter regeneration means to combust and remove the particulate matter deposited in the filter of the exhaust gas cleaning device, wherein

the filter regeneration means includes;

a first regeneration control mode for performing an automatic regeneration for automatically combusting and removing the particulate matter deposited in the filter when a deposition amount of the particulate matter deposited in the filter is equal to a predetermined value or more; and

a second regeneration control mode for requiring to increase the speed of the diesel engine when the automatic regeneration is performed.

9. The working machine according to claim 8, wherein

the first regeneration control mode performs the automatic regeneration when the deposition amount of the particulate matter becomes the first deposition amount threshold or more, and

the second regeneration control mode requires to increase the speed of the diesel engine to a predetermined speed or more when the deposition amount of the particulate matter is not less than a warning clearing threshold value lower than the first deposition amount threshold value within a predetermined time from the starting of the automatic regeneration due to the first regeneration control mode.

10. The working machine according to claim 8, wherein

the first regeneration control mode performs the automatic regeneration when the deposition amount of the particulate matter becomes a first deposition amount threshold value or more, and

the second regeneration control mode requires to increase the speed of the diesel engine to a predetermined speed or more when the deposition amount of the particulate matter becomes a second deposition amount threshold value or more higher than the first deposition amount threshold value.

11. The working machine according to claim 9, comprising

a third regeneration control mode for ordering the diesel engine to limit an output within a predetermined range when the deposition amount of the particulate matter becomes a third deposition amount threshold value or more higher than the second deposition amount threshold value at a step where the requirement is made.

12. The working machine according to claim 10, comprising

a third regeneration control mode for ordering the diesel engine to limit an output within a predetermined range when the deposition amount of the particulate matter becomes a third deposition amount threshold value or more higher than the second deposition amount threshold value at a step the requirement is made.

13. A working machine comprising:

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

a filter regeneration means to combust and remove the particulate matter deposited in the filter of the exhaust gas cleaning device; and

a boarding confirmation means to confirm boarding, including;

a regeneration permission means to permit a regenerating operation to combust and remove the particulate matter due to the filter regeneration means under a state where the engine is in operation and the boarding confirmation means confirms the boarding; and

a deposition suppression means to suppress increasing of the deposition amount of the particulate matter deposited in the filter by stopping the engine under a state where the engine is in operation and the boarding confirmation means cannot confirm the boarding.

14. The working machine according to claim 13, wherein

the deposition suppression means stops the engine when the state where the engine is in operation and the boarding is not confirmed is continued for a predetermined time.

15. The working machine according to claim 13, wherein

the deposition suppression means stops the engine when the deposition amount is in an increasing tendency under the state where the engine is in operation and the boarding is not confirmed.

16. The working machine according to claim 13, wherein

the filter regeneration means has an automatic regeneration mode for automatically performs the regenerating operation when the deposition amount of the particulate matter deposited in the filter is a predetermined value or more.

17. The working machine according to claim 16, wherein

the filter regeneration means includes an output limitation mode for limiting an output of the diesel engine at the step where the automatic regeneration mode is performed and when the deposition amount is in the increasing tendency more than that before the automatic regeneration mode.

18. The working machine according to claim 13, wherein

the filter regeneration means includes a regenerating operation help mode for informing to increase the speed of the diesel engine as help of the regenerating operation.

19. The working machine according to claim 13 configured so as to restart the engine after the engine is stopped by the deposition suppression means.

20. A working machine comprising:

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

a filter regeneration means to combust and remove the particulate matter deposited in the filter of the exhaust gas cleaning device; and

a boarding confirmation means to confirm boarding or getting-off, including;

an engine speed control means to automatically decrease the speed of the engine when the engine is in operation under a state where the getting-off is confirmed by the boarding confirmation means and when the deposition amount of the particulate matter deposited in the filter is a predetermined value or more.

21. The working machine according to claim 20, wherein

the engine speed control means decreases the engine speed to zero when the engine speed under the state of getting-off is an idling engine speed and the deposition amount is a predetermined value or more.

22. The working machine according to claim 20, wherein

the engine speed control means gradually decreases the engine speed to an idling engine speed and finally to zero when the engine speed under the state of getting-off is an idling engine speed or more and the deposition amount is a predetermined value or more.

23. The working machine according to claim 20, including

an output limitation means to limit an output of the engine with the increasing and decreasing of the speed of the engine allowed when the engine is in operation under a state where the boarding is confirmed by the boarding confirmation means and the deposition amount of the particulate matter deposited in the filter is a predetermined value or more.

24. The working machine according to claim 20, including

an information means to inform to decrease the speed of the engine when the speed of the engine is decreased by the engine speed control means.