WO2012172951A1 - 建設機械 - Google Patents
建設機械 Download PDFInfo
- Publication number
- WO2012172951A1 WO2012172951A1 PCT/JP2012/063349 JP2012063349W WO2012172951A1 WO 2012172951 A1 WO2012172951 A1 WO 2012172951A1 JP 2012063349 W JP2012063349 W JP 2012063349W WO 2012172951 A1 WO2012172951 A1 WO 2012172951A1
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- WO
- WIPO (PCT)
- Prior art keywords
- engine
- exhaust gas
- regeneration
- temperature
- speed
- Prior art date
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
- E02F9/2062—Control of propulsion units
- E02F9/2066—Control of propulsion units of the type combustion engines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2025—Particular purposes of control systems not otherwise provided for
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
- E02F9/2095—Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2246—Control of prime movers, e.g. depending on the hydraulic load of work tools
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2285—Pilot-operated systems
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/02—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate silencers in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/0231—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/0235—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using exhaust gas throttling means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/103—Oxidation catalysts for HC and CO only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
- F02D31/007—Electric control of rotation speed controlling fuel supply
- F02D31/008—Electric control of rotation speed controlling fuel supply for idle speed control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/08—Introducing corrections for particular operating conditions for idling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/06—Ceramic, e.g. monoliths
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/08—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for heavy duty applications, e.g. trucks, buses, tractors, locomotives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/0601—Parameters used for exhaust control or diagnosing being estimated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1406—Exhaust gas pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1606—Particle filter loading or soot amount
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a construction machine provided with an exhaust gas purification device suitably used for removing harmful substances from, for example, exhaust gas of a diesel engine.
- a construction machine typified by a hydraulic shovel is provided with a self-propelled lower traveling body, an upper revolving body pivotally mounted on the lower traveling body, and movably provided in front of the upper revolving body. And the working device.
- the upper swing body has an engine for driving a hydraulic pump at the rear of the swing frame, and a cab, a fuel tank and a hydraulic oil tank mounted on the front side of the swing frame.
- a diesel engine is generally used as an engine serving as a prime mover of a hydraulic shovel.
- the exhaust gas emitted from such a diesel engine may contain, for example, harmful substances consisting of particulate matter (PM: Particulate Matter) and nitrogen oxide (NOx).
- PM particulate Matter
- NOx nitrogen oxide
- an exhaust gas purification device is provided in an exhaust pipe forming an exhaust gas passage of an engine.
- This exhaust gas purification apparatus is, for example, an oxidation catalyst means (usually, Diesel Oxidation Catalyst), which oxidizes and removes nitrogen monoxide (NO), carbon monoxide (CO), and hydrocarbons (HC) contained in exhaust gas. (Also referred to as DOC), and particulate matter removal means (usually, Diesel Particulate Filter, abbreviated as DPF) disposed downstream of the oxidation catalyst means for trapping and removing particulate matter in exhaust gas. And a post-processing device (see Patent Document 1).
- Diesel Oxidation Catalyst Diesel Oxidation Catalyst
- DPF Diesel Particulate Filter
- the inventors examined a low temperature regeneration process performed at a temperature lower than the high temperature regeneration by post injection when the filter of the particulate matter removing means is clogged.
- low temperature regeneration processing for example, there is a method of throttling the amount of intake air and raising the exhaust temperature so that the air-fuel ratio of air and fuel tends to be rich.
- an exhaust throttle valve is provided on the exhaust pipe side of the engine, the load on the engine is increased by the exhaust throttle valve, and as a result, the temperature of the exhaust gas is raised.
- an engine as a prime mover an exhaust gas purification device provided on the exhaust side of the engine for purifying exhaust gas, and a regeneration device for regenerating the exhaust gas purification device
- a direction control valve provided between the hydraulic pump and controlling the supply of pressure oil to the hydraulic actuator, a rotation number indicating device for indicating the rotation number of the engine, and an auto having a predetermined rotation number of the engine Auto idle selection means for reducing the idle speed to the idle speed, and always according to the indicated value by the
- An engine control system for controlling the number of revolutions of the engine and controlling the number of revolutions of the engine at the auto idle speed by the auto idle selection means regardless of the indicated value when the directional control valve is in the neutral position Applies to
- the feature of the configuration adopted by the present invention is that, when the engine control device controls the number of revolutions of the engine at the auto idle rpm by the auto idle selection means, When it is determined that the regeneration process is to be performed by the regeneration determination means, which determines whether or not to perform the regeneration process, and the regeneration determination means, the number of revolutions of the engine is set to the number of revolutions for regeneration process higher than the auto idle revolution number. And an engine speed increasing means for raising the speed.
- the exhaust gas purification device even when the exhaust gas temperature drops due to no load or light load operation of the engine accompanying the auto idle control, it is necessary to regenerate the exhaust gas purification device by raising the engine to the number of revolutions for regeneration processing.
- the temperature of the exhaust gas can be easily raised to a certain temperature, and the regeneration process of the exhaust gas purification device can be performed at the lowest possible temperature.
- the particulate matter deposited on the filter of the particulate matter removing means can be burned to regenerate the filter, and the purification process of the exhaust gas can be stably performed. Thereby, the reliability as an exhaust gas purification device can be improved.
- the temperature of the exhaust gas is increased to the temperature required for the regeneration process of the exhaust gas purification device.
- the exhaust gas purification apparatus is provided with a temperature detector for detecting the temperature of the exhaust gas, and the engine speed increasing means of the engine control apparatus determines that the regeneration process is performed by the regeneration determination means. When this occurs, the number of revolutions of the engine is increased until the temperature of the exhaust gas reaches the temperature for the regeneration process.
- the number of revolutions of the engine is increased at each predetermined number of revolutions until the temperature of the exhaust gas reaches the temperature for regeneration process.
- the temperature of the exhaust gas can be raised to the temperature required to regenerate the exhaust gas purification device, and the regeneration treatment of the exhaust gas purification device can be performed at the lowest possible temperature.
- the present invention includes a rotation sensor that detects the number of rotations of the engine, and the engine control device determines whether the number of rotations of the engine detected by the rotation sensor is equal to or higher than the number of rotations for regeneration processing If the number of revolutions of the engine is determined to be lower than the number of revolutions for regeneration processing by the number of revolutions determination means for determining whether or not the number of revolutions is determined, and the regeneration processing is performed by the regeneration determination means Idle rotation speed control means for controlling the rotation speed of the engine to the auto idle rotation speed when determined, and predetermined determination in a state where the rotation speed of the engine is controlled to the auto idle rotation speed by the idle rotation speed control means And engine stop means for performing control to stop the engine when the elapsed time has elapsed.
- the regeneration device is configured to perform a low temperature regeneration process for raising the temperature of the exhaust gas by means of a throttle valve provided on at least one of the intake side and the exhaust side of the engine.
- the regeneration device for performing regeneration treatment of the exhaust gas purification device can be configured by the throttle valve provided on at least one of the intake side and the exhaust side of the engine.
- the throttle valve on the intake side does not perform high temperature regeneration by post injection when the filter of the exhaust gas purification device (particulate matter removing means) is clogged, and for example, the air fuel ratio of air and fuel is A low temperature regeneration process can be performed to reduce the amount of intake air and raise the exhaust temperature so as to be rich.
- the throttle valve provided on the exhaust side of the engine can perform low-temperature regeneration processing to raise the temperature of the exhaust gas as a result by throttling the flow of the exhaust gas to increase the load on the engine.
- FIG. 1 is an overall configuration diagram showing an engine, a hydraulic pump, a control valve, a hydraulic actuator, and an exhaust gas purification device.
- FIG. 6 is a characteristic diagram showing the relationship between the engine rotational speed, the output torque, and the temperature of exhaust gas.
- FIG. 6 is a characteristic diagram showing the relationship between the discharge pressure of the hydraulic pump and the flow rate.
- FIGS. 1 to 6 show a hydraulic shovel provided with an exhaust gas purification device according to a first embodiment of the present invention.
- 1 is a small hydraulic shovel used for excavation work of earth and sand.
- the hydraulic shovel 1 is mounted on a self-propelled crawler lower traveling body 2 and the lower traveling body 2 so as to be able to turn via the turning device 3, and the upper turning which constitutes the vehicle body together with the lower traveling body 2.
- It is roughly constituted by the body 4 and the working device 5 provided on the front side of the upper swing body 4 so as to be able to move up and down.
- the work device 5 is configured as a swing post type work device, and for example, a swing post 5A, a boom 5B, an arm 5C, a bucket 5D as a work tool, a swing cylinder (not shown), a boom cylinder 5E, an arm cylinder A 5F and a bucket cylinder 5G are provided.
- the upper swing body 4 is configured by a swing frame 6, an exterior cover 7, a cab 8, a counterweight 9, and the like described later.
- the pivoting frame 6 is a support structure for the upper pivoting body 4, and the pivoting frame 6 is mounted on the undercarriage 2 via the pivoting device 3.
- the turning frame 6 is provided with a counterweight 9 and an engine 10 described later on the rear side, and a cab 8 described later is provided on the left front side.
- an exterior cover 7 is provided on the swing frame 6 so as to be located between the cab 8 and the counterweight 9, and the engine 10, the hydraulic pump 13 and the heat exchanger 15 are accommodated in the exterior cover 7. ing.
- the cab 8 is mounted on the left front side of the turning frame 6, and the cab 8 internally defines an operator's cab on which the operator rides. Inside the cab 8, a driver's seat on which an operator is seated and various control levers (only the control lever 27A described later is shown in FIG. 3) are disposed.
- the counterweight 9 constitutes a part of the upper swing body 4, and the counterweight 9 is attached to the rear end of the swing frame 6 while being positioned on the rear side of the engine 10 described later. It is As shown in FIG. 2, the rear surface side of the counterweight 9 is formed in an arc shape, and is configured to keep the turning radius of the upper swing body 4 small.
- Reference numeral 10 denotes an engine disposed horizontally on the rear side of the swing frame 6.
- the engine 10 is mounted as a prime mover on the small hydraulic excavator 1 as described above, and is configured using, for example, a small diesel engine ing.
- the engine 10 is provided with an intake pipe 11 and an exhaust pipe 12 forming a part of an exhaust gas passage, and an exhaust gas purification device 16 described later is connected to the exhaust pipe 12.
- the intake pipe 11 of the engine 10 is configured by an intake manifold including a plurality of branch pipes
- the exhaust pipe 12 of the engine 10 is configured by an exhaust manifold including a plurality of branch pipes. ing.
- an intake air throttle valve 35 described later is provided in the middle of the intake pipe 11.
- an exhaust throttle valve 36 described later is provided in the middle of the exhaust pipe 12.
- the engine 10 is configured of an electronically controlled engine, and the amount of supplied fuel is variably controlled by an electronic governor (not shown). That is, the electronic governor variably controls the injection amount of the fuel supplied to the engine 10 based on the control signal output from the engine control device 34 described later. Thereby, the rotation speed of the engine 10 is controlled to be the rotation speed corresponding to the target rotation speed according to the control signal.
- the hydraulic pump 13 is mounted on the left side of the engine 10, and the hydraulic pump 13 constitutes a hydraulic source together with a hydraulic oil tank (not shown).
- the hydraulic pump 13 is configured of, for example, a variable displacement swash plate type, an oblique axis type or a radial piston type hydraulic pump.
- the hydraulic pump 13 is not necessarily limited to a variable displacement hydraulic pump, and may be configured using, for example, a fixed displacement hydraulic pump.
- the hydraulic pump 13 is mounted on the left side of the engine 10 via a power transmission device 14, and the power transmission device 14 transmits the rotational output of the engine 10.
- the hydraulic pump 13 sucks the hydraulic oil in the hydraulic oil tank and discharges the hydraulic oil toward a control valve 25 described later.
- the heat exchanger 15 is located on the right side of the engine 10 and provided on the revolving frame 6.
- the heat exchanger 15 includes, for example, a radiator, an oil cooler, and an intercooler. That is, the heat exchanger 15 not only cools the engine 10 but also cools the pressure oil (working oil) returned to the working oil tank.
- an exhaust gas purification device 16 removes and purifies harmful substances contained in the exhaust gas of the engine 10, and the exhaust gas purification device 16 is, for example, power on the upper left side of the engine 10 as shown in FIG. It is disposed at a position above the transmission device 14.
- the exhaust pipe 12 of the engine 10 is connected upstream of the exhaust gas purification device 16.
- the exhaust gas purification device 16 constitutes an exhaust gas passage together with the exhaust pipe 12, and removes harmful substances contained in the exhaust gas while the exhaust gas flows from the upstream side to the downstream side.
- the engine 10 formed of a diesel engine is highly efficient and excellent in durability.
- the exhaust gas of the engine 10 contains harmful substances such as particulate matter (PM: Particulate Matter), nitrogen oxide (NOx), carbon monoxide (CO) and the like.
- the exhaust gas purification device 16 attached to the exhaust pipe 12 collects the particulate matter (PM) by removing the after-mentioned oxidation catalyst 18 which oxidizes and removes carbon monoxide (CO) and the like and And the particulate matter removal filter 19 of FIG.
- the exhaust gas purification device 16 has a cylindrical casing 17 configured by detachably connecting a plurality of cylinders before and after.
- an oxidation catalyst 18 usually called Diesel Oxidation Catalyst, abbreviated as DOC
- a particulate matter removal filter 19 usually, Diesel Particulate Filter, abbreviated as DPF
- the oxidation catalyst 18 is made of, for example, a ceramic cellular cylinder having an outer diameter equal to the inner diameter of the casing 17, and a large number of through holes (not shown) are formed in the axial direction, The inner surface is coated with a noble metal.
- the oxidation catalyst 18 oxidizes and removes carbon monoxide (CO) and hydrocarbons (HC) contained in the exhaust gas by circulating the exhaust gas in the respective through holes at a predetermined temperature, thereby causing nitrogen oxidation.
- the substance (NO) is to be removed as nitrogen dioxide (NO2).
- the particulate matter removal filter 19 is disposed downstream of the oxidation catalyst 18 in the casing 17.
- the particulate matter removing filter 19 collects particulate matter (PM) in the exhaust gas discharged from the engine 10, and burns and removes the trapped particulate matter to purify the exhaust gas. It is a thing.
- the particulate matter removal filter 19 is formed of, for example, a cellular cylindrical body in which a large number of small holes (not shown) are provided in the axial direction in a porous member made of, for example, a ceramic material.
- the particulate matter removal filter 19 collects particulate matter through the large number of small holes, and the trapped particulate matter is burned and removed as described above. As a result, the particulate matter removal filter 19 is regenerated.
- the exhaust gas outlet 20 is provided on the downstream side of the exhaust gas purification device 16.
- the outlet 20 is located downstream of the particulate matter removal filter 19 and connected to the outlet side of the casing 17.
- the exhaust port 20 includes, for example, a chimney for releasing the exhaust gas after the purification processing into the atmosphere.
- the exhaust temperature sensor 21 detects the temperature t of the exhaust gas, and the exhaust temperature sensor 21 constitutes a temperature detector according to the present invention. As shown in FIG. 3, the exhaust temperature sensor 21 is attached to the casing 17 of the exhaust gas purification device 16 and detects the temperature t of the exhaust gas discharged from the exhaust pipe 12. The temperature t detected by the exhaust temperature sensor 21 is output as a detection signal to an engine control device 34 described later.
- the gas pressure sensors 22 and 23 are provided in the casing 17 of the exhaust gas purification device 16, and the gas pressure sensors 22 and 23 are disposed apart from each other with the particulate matter removal filter 19 interposed therebetween.
- One gas pressure sensor 22 detects the gas pressure of the exhaust gas as a pressure P1 on the upstream side (inlet side) of the particulate matter removal filter 19, and the other gas pressure sensor 23 downstream of the particulate matter removal filter 19
- the gas pressure of the exhaust gas is detected as pressure P2 on the side (outlet side), and the gas pressure sensors 22 and 23 output respective detection signals to an engine control unit 34 described later.
- the engine control unit 34 calculates the pressure difference .DELTA.P between the upstream pressure P1 detected by the gas pressure sensor 22 and the downstream pressure P2 detected by the gas pressure sensor 23 according to the following equation (1). Further, the engine control device 34 estimates the amount of accumulation of the particulate matter and the unburned residue adhering to the particulate matter removal filter 19 from the calculation result of the pressure difference ⁇ P, that is, the amount of collection. In this case, the pressure difference ⁇ P becomes a small pressure value when the amount of collection is small, and becomes a high pressure value as the amount of collection increases.
- the plurality of hydraulic actuators 24 are driven by pressure oil discharged from the hydraulic pump 13.
- These hydraulic actuators 24 include, for example, a swing cylinder (not shown) of the working device 5, a boom cylinder 5E, an arm cylinder 5F, or a bucket cylinder 5G (see FIG. 1).
- the hydraulic actuator 24 mounted on the hydraulic shovel 1 also includes, for example, a hydraulic motor for traveling, a hydraulic motor for turning, and a lifting cylinder (not shown) for the earth removal plate.
- the plurality of control valves 25 (only one is shown in FIG. 3) constitute a directional control valve for the hydraulic actuator 24.
- the control valves 25 are respectively provided between the hydraulic pump 13 and each hydraulic actuator 24 and variably control the flow rate and direction of the hydraulic oil supplied to each hydraulic actuator 24. That is, each control valve 25 is switched from the neutral position to the left and right switching positions (neither is shown) by supplying a pilot pressure from the operation valve 27 described later.
- the pilot pump 26 is an auxiliary hydraulic pump that constitutes an auxiliary hydraulic pressure source together with the hydraulic oil tank. As shown in FIG. 3, this pilot pump 26 is rotationally driven by the engine 10 together with the main hydraulic pump 13. The pilot pump 26 discharges the working oil sucked from the working oil tank toward the operation valve 27 described later.
- the control valve 27 is composed of a pressure reducing valve type pilot control valve.
- the control valve 27 is provided in the cab 8 (see FIG. 1) of the hydraulic shovel 1 and has a control lever 27A which is operated by the operator to tilt.
- the operation valves 27 are disposed in numbers corresponding to the plurality of control valves 25 in order to remotely control the plurality of hydraulic actuators 24 individually. That is, each operation valve 27 supplies a pilot pressure corresponding to the operation amount to the hydraulic pilot portion (not shown) of each control valve 25 when the operator tilts the operation lever 27A.
- control valve 25 is switched from the neutral position to one of the switching positions.
- pressure oil from the hydraulic pump 13 is supplied to the hydraulic actuator 24 in one direction and driven in the corresponding direction.
- the hydraulic actuator 24 is such that pressure oil from the hydraulic pump 13 is supplied in the other direction and driven in the opposite direction.
- the operation detector 28 detects whether the control valve 25 is in the neutral position.
- the operation detector 28 is configured of a pressure sensor that detects a pilot pressure output from the operation valve 27. That is, the operation detector 28 detects whether the control valve 25 is in the neutral position based on whether the pilot pressure is higher or lower than a predetermined pressure value.
- the rotation number indicating device 29 indicates a target rotation number of the engine 10.
- the rotation speed indicating device 29 is provided in the cab 8 (see FIG. 1) of the hydraulic shovel 1 and is constituted by an operation dial operated by an operator, an up / down switch, an engine lever (all not shown), etc. There is.
- the rotation speed instruction device 29 outputs an instruction signal of a target rotation speed according to the operation of the operator to a vehicle control device 33 described later.
- the auto idle selection switch 30 is provided in the cab 8 of the hydraulic shovel 1 and operated to be opened and closed by the operator.
- the auto idle selection switch 30 constitutes an auto idle selection means according to the present invention.
- the auto idle selection switch 30 outputs an open signal when the switch is opened or a close signal when the switch is closed to a vehicle control device 33 described later. That is, the vehicle control apparatus 33 cooperates with an engine control apparatus 34 described later to reduce the engine speed N to a predetermined auto idle speed Nai when the auto idle selection switch 30 is closed.
- the auto idle selection switch 30 is opened, the auto idle control is not performed, and the engine speed N is controlled in accordance with the target speed instructed by the speed instruction device 29. .
- the rotation sensor 31 detects the number of rotations N of the engine 10, and the rotation sensor 31 outputs a detection signal of the number of rotations N to the engine control device 34.
- the engine control device 34 monitors the actual rotation number of the engine 10 based on the detection signal of the engine rotation number N, and controls the engine rotation number N according to the target rotation number instructed by the rotation number indicating device 29, for example.
- Reference numeral 32 denotes a control unit of the hydraulic shovel 1.
- the control unit 32 includes a vehicle control unit 33 and an engine control unit 34 as shown in FIG.
- the vehicle body control device 33 variably controls, for example, the displacement of the hydraulic pump 13 necessary for traveling of the hydraulic shovel 1 according to the signals output from the operation detector 28, the rotation speed indicator 29 and the auto idle selection switch 30. Do.
- the vehicle body control device 33 has a function of outputting a command signal for instructing the engine control device 34 of the target number of revolutions of the engine 10 in accordance with the signals outputted from the operation detector 28, the rotation number instruction device 29 and the auto idle selection switch 30. Also have.
- the engine control unit 34 performs predetermined arithmetic processing based on the command signal output from the vehicle control unit 33 and the detection signal of the engine rotational speed N output from the rotation sensor 31, etc. Outputs a control signal indicating the target fuel injection amount.
- the electronic governor of the engine 10 increases or decreases the injection amount of the fuel to be injected and supplied into the combustion chamber (not shown) of the engine 10 according to the control signal, and stops the fuel injection. As a result, the number of revolutions of the engine 10 is controlled to be the number of revolutions corresponding to the target number of revolutions indicated by the command signal from the vehicle control device 33.
- the engine control device 34 controls the rotational speed of the engine 10 in accordance with the command value (target rotational speed) by the rotational speed command device 29.
- the auto idle selection switch 30 is closed and all the control valves 25 are in the neutral position by the operation detector 28, the number of revolutions of the engine 10 is controlled by the auto idle rpm Nai regardless of the indicated value.
- the input side of the engine control unit 34 is connected to the exhaust temperature sensor 21, the gas pressure sensors 22 and 23, the rotation sensor 31, and the vehicle control unit 33, and the output side is an electronic governor of the engine 10, an intake throttle valve 35 described later
- the exhaust throttle valve 36 and the vehicle control device 33 are connected.
- the engine control device 34 has a storage unit (not shown) including a ROM, a RAM, a non-volatile memory and the like. In the storage unit, a processing program for controlling an engine speed N shown in FIG. 6 described later, a predetermined determination time T1 for auto idle, an auto idle speed Nai of the engine 10, a rotation for regeneration processing The number N1 and the like are stored.
- the engine control unit 34 calculates the pressure difference .DELTA.P of the both by the equation 1 from the pressure P1 on the upstream side detected by the gas pressure sensor 22 and the pressure P2 on the downstream side detected by the gas pressure sensor 23. . Then, the engine control device 34 estimates the amount of trapped particulate matter and unburned residue adhering to the particulate matter removal filter 19 (see FIG. 3) and the amount of deposited particulate matter from the pressure difference ⁇ P between the two. When the pressure difference .DELTA.P exceeds a predetermined reference pressure value .DELTA.P0, it is judged that the accumulated amount becomes large and the regeneration process of the particulate matter removing filter 19 is necessary. As a method of estimating the deposition amount of particulate matter, there is also a method of estimating from the operating condition of the engine (for example, the number of revolutions, the injection amount, etc.) other than the estimation method by the pressure difference ⁇ P.
- Reference numeral 35 denotes an intake throttle valve provided on the side of the intake pipe 11 of the engine 10.
- the intake throttle valve 35 is a regeneration process of the particulate matter removing filter 19 in the exhaust gas purification device 16 shown in FIG.
- the playback device is configured to That is, the intake air throttle valve 35 is held in the open state (for example, the opening degree corresponding to the fuel injection amount or the fully open state) during the normal operation by the control signal from the engine control device 34. However, when the regeneration process of the particulate matter removal filter 19 is performed, the intake air throttle valve 35 is driven in the valve closing direction by the control signal from the engine control device 34.
- the intake air throttle valve 35 throttles the intake air amount so that the air-fuel ratio of air and fuel tends to be rich, for example.
- the temperature t of the exhaust gas discharged to the exhaust pipe 12 side rises to, for example, about 250 ° C. by burning the fuel whose air-fuel ratio tends to be rich.
- low temperature regeneration processing is performed by the heat energy of the exhaust gas at this time.
- An exhaust throttle valve 36 is provided on the side of the exhaust pipe 12 of the engine 10.
- the exhaust throttle valve 36 is a regeneration device for regenerating the particulate matter removal filter 19 in the exhaust gas purification device 16 shown in FIG. Are configured. That is, the exhaust throttle valve 36 is held in the fully open state during normal operation by the control signal from the engine control device 34. However, when the regeneration process of the particulate matter removal filter 19 is performed, the exhaust throttle valve 36 is driven in the valve closing direction by the control signal from the engine control device 34, and control is performed to narrow the opening degree.
- the exhaust throttle valve 36 throttles the flow rate of the exhaust gas flowing in the exhaust pipe 12 to apply a back pressure to the engine 10 to increase the load on the engine 10.
- the engine control device 34 increases the fuel injection amount by the electronic governor of the engine 10 correspondingly to the load.
- the temperature of the exhaust gas rises to, for example, about 250 ° C., and the low temperature regeneration process is performed in the particulate matter removal filter 19 of the exhaust gas purification device 16.
- the output torque Tr of the engine 10 has torque characteristics as indicated by the characteristic line 37 shown in FIG.
- the iso-exhaust temperature diagram during normal operation when the exhaust temperature of the engine 10 is, for example, 250 ° C. the exhaust temperature is increased if the output torque Tr increases even when the engine speed N is low. While maintaining at 250 ° C., the characteristic curve 38 rises. Also, when the engine speed N increases from the low speed to the high speed, the exhaust temperature is maintained at 250 ° C. even if the output torque Tr decreases along the characteristic line 38.
- the iso-exhaust temperature diagram at 250 ° C. is a characteristic line 38.
- the position of the characteristic line 39 is lowered from the position of. Therefore, when low temperature regeneration of the particulate matter removal filter 19 is performed, as shown by the characteristic line 39, the engine rotational speed N is higher than the auto idle rotational speed Nai, that is, the regeneration speed N1 (N1> Nai). Set to). Thereby, the exhaust temperature of the engine 10 can be raised to the low temperature regeneration temperature t1 (e.g., t1 ⁇ 250 ° C.).
- the low temperature regeneration temperature t1 is a temperature at which the temperature t of the exhaust gas discharged from the engine 10 can regenerate the particulate matter removal filter 19 (ie, the particulate matter contained in the exhaust gas can be burned (Temperature) is a temperature serving as a determination reference for determining whether the temperature has increased.
- a torque value Trm shown in FIG. 4 is a torque that the engine 10 receives from the hydraulic pump 13.
- the hydraulic pump 13 is driven within the range of the characteristic line 40 by the discharge pressure (P) and the discharge flow rate (Q) shown in FIG.
- P discharge pressure
- Q discharge flow rate
- the hydraulic pump 13 is rotationally driven by the engine 10 at the position of the operating point 41 during corotation as shown in FIG. 5 even when the engine 10 is rotating at the auto idle rotation speed Nai by the auto idle control.
- the torque that the engine 10 receives from the hydraulic pump 13 is a torque value Trm shown in FIG. 4.
- the engine 10 when the engine 10 is rotationally driven at the position of the operating point 41 when the hydraulic pump 13 is corotated, the engine 10 generates an output torque Tr that has a torque value Trm shown in FIG.
- the exhaust gas purification device 16 mounted on the hydraulic shovel 1 according to the present embodiment has the configuration as described above, and the operation thereof will be described next.
- the operator of the hydraulic shovel 1 gets into the cab 8 of the upper revolving superstructure 4, starts the engine 10, and drives the hydraulic pump 13 and the pilot pump 26. As a result, pressure oil is discharged from the hydraulic pump 13, and this pressure oil is supplied to the hydraulic actuator 24 via the control valve 25.
- other control valves are supplied to other hydraulic actuators (for example, traveling and turning hydraulic motors or other hydraulic cylinders).
- traveling control lever not shown
- the lower traveling body 2 can be advanced or retracted.
- the work device 5 can be raised and lowered to perform earth and sand digging work.
- the small hydraulic excavator 1 has a small turning radius by the upper turning body 4, for example, even in a narrow work site such as an urban area, the side groove digging operation can be performed by the working device 5 while turning driving the top turning body 4 In such a case, noise may be reduced by operating the engine 10 under a light load.
- particulate matter which is a harmful substance is discharged from the exhaust pipe 12.
- the exhaust gas purification device 16 can oxidize and remove, for example, hydrocarbons (HC), nitrogen oxides (NO) and carbon monoxide (CO) in the exhaust gas by the oxidation catalyst 18.
- the particulate matter removal filter 19 collects particulate matter contained in the exhaust gas and burns and removes (regenerates) the trapped particulate matter. As a result, the purified exhaust gas can be discharged to the outside from the downstream exhaust port 20.
- the small swing (small) hydraulic excavator 1 having a compact and compact structure, it has become mainstream to perform auto idle control for the purpose of saving fuel consumption, reducing noise, or reducing noise.
- the engine speed of the engine 10 is maintained at the auto idle speed Nai, which is a low speed.
- the temperature t of the exhaust gas drops to a temperature lower than the low temperature regeneration temperature t1 (for example, t1 ° 250 ° C.).
- the particulate matter is trapped and deposited on the particulate matter removal filter 19 of the exhaust gas purification device 16, and the filter 19 is easily clogged.
- the engine control device 34 is configured to execute the auto idle control and the filter regeneration process of the exhaust gas purification device 16 in accordance with the program shown in FIG. That is, when the regeneration process of the exhaust gas purification device 16 (particulate matter removing filter 19) is performed with the auto idle control enabled, the engine speed N is higher than the auto idle speed Nai. Raise to N1. Thereby, the temperature t of the exhaust gas is easily raised to the temperature (low temperature regeneration temperature t1) necessary to regenerate the exhaust gas purification device 16, and the regeneration treatment of the exhaust gas purification device 16 is performed at the lowest possible temperature. Can.
- step 1 when the processing operation of FIG. 6 is started by the operation of the engine 10, it is determined in step 1 whether or not the auto idle selection switch 30 is closed. Since the auto idle selection switch 30 is open during the determination of "NO" in step 1, the auto idle control is not performed. For this reason, in the next step 2, the engine 10 is controlled in the number of revolutions according to the target number of revolutions (designated number of revolutions) instructed by the operator in the cab 8 using the number-of-rotations instruction device 29 The rotation speed is maintained. After that, step 3 returns.
- step 1 When it is determined as “YES” in step 1, the auto idle control is selected, so in the next step 4, the actual rotation speed (engine rotation speed N) detected by the rotation sensor 31 attached to the engine 10 is It is determined whether the number of rotations is equal to or more than the number of rotations for regeneration processing N1. When it is determined in step 4 that the result is "NO”, the engine rotational speed N has decreased to a rotational speed lower than the regeneration processing rotational speed N1. When the engine rotational speed N decreases to a rotational speed lower than the rotational speed N1 for regeneration treatment, the particulate matter removal filter 19 of the exhaust gas purification device 16 can not properly perform the regeneration treatment, and particulate matter and unburned residue The amount of deposition will increase. Therefore, in order to prevent this, the process proceeds to step 2, the engine speed N is maintained at the designated speed, and the process returns in step 3.
- step 4 If it is determined “YES” in step 4, the engine speed N is equal to or higher than the speed N1 for regeneration processing, so it is determined in the next step 5 whether or not the control lever 27A is neutral. While the determination in step 5 is “NO”, at least one control valve 25 among the plurality of control valves 25 is switched from the neutral position to the switching position, and one of the hydraulic actuators 24 is driven. Therefore, the process proceeds to step 2 to maintain the engine speed N at the designated speed, and the process returns in step 3.
- step 5 When it is determined in step 5 that the result is "YES”, all the hydraulic actuators 24 mounted on the hydraulic shovel 1 are stopped, and all the control valves 25 are held at the neutral position. That is, the engine 10 is in a light load state close to no-load operation, and the output torque Tr of the engine 10 is reduced to the co-rotation torque from the hydraulic pump 13 (torque value Trm shown in FIG. 4).
- step 6 it is determined whether or not a predetermined determination time T1 for auto idle has passed after the control lever 27A is returned to the neutral position. Since the determination time T1 for auto idle is not satisfied while the determination in step 6 is "NO", the process proceeds to step 2, the engine speed N is maintained at the instructed rotation speed, and the process returns in step 3. That is, if it is interrupted frequently after the auto idle control is started, the load on the engine 10 and the fuel efficiency performance will be reduced. Therefore, the determination process of step 6 is a process performed to suppress the start of the auto idle control until the determination time T1 for the auto idle elapses.
- step 7 determines whether or not the filter regeneration process is to be performed. That is, in step 7, it is determined whether the low temperature regeneration process is to be performed on the particulate matter removal filter 19 of the exhaust gas purification device 16 using the regeneration device (for example, the intake throttle valve 35 and the exhaust throttle valve 36).
- step 7 When the determination in step 7 is “NO”, the particulate matter removal filter 19 of the exhaust gas purification device 16 does not need to be subjected to the low temperature regeneration process. Therefore, in the next step 8, in order to execute the auto idle control, the auto idle speed Nai is selected as the target speed of the engine 10, and control is performed to reduce the engine speed N to the auto idle speed Nai.
- step 7 When the determination in step 7 is “YES”, the particulate matter removal filter 19 of the exhaust gas purification device 16 needs to be subjected to the low temperature regeneration process. Therefore, in the next step 9, the target rotational speed of the engine 10 is set to the rotational speed for regeneration N1, and control is performed to increase the engine rotational speed N from the auto idle rotational speed Nai to the rotational speed for regeneration N1. That is, the engine control device 34 performs a low temperature regeneration process using the intake throttle valve 35 and / or the exhaust throttle valve 36.
- the engine control device 34 outputs a control signal for performing the low temperature regeneration process to the engine 10.
- the intake air throttle valve 35 provided in the intake pipe 11 of the engine 10 performs control to decrease the amount of intake air to make the air fuel consumption rich.
- an exhaust throttle valve 36 provided on the exhaust pipe 12 side performs control to throttle the flow rate of the exhaust gas and apply a load to the engine 10.
- Such low-temperature regeneration processing may be performed using both the intake throttle valve 35 and the exhaust throttle valve 36, and in some cases, may be performed using only one of the throttle valves.
- an equal exhaust temperature diagram at 250 ° C. is represented as a characteristic line 38 in FIG. 4.
- the iso-exhaust temperature diagram of 250 ° C. is lowered to the position of the characteristic line 39 shown in FIG.
- the output torque Tr of the engine 10 is reduced to the co-rotation torque from the hydraulic pump 13 (torque value Trm shown in FIG. 4).
- the target rotation number of the engine 10 is set to the rotation number for regeneration processing N1 (N1> Nai) represented by the intersection of the torque value Trm and the characteristic line 39. Is set to control the engine speed N. Thereby, the exhaust temperature of the engine 10 can be raised to the low temperature regeneration temperature t1 (e.g., t11250 ° C.).
- the engine control device 34 automatically idles the engine speed N during no-load operation (or operation with a small load) of the engine 10 in which all the hydraulic actuators 24 are stopped.
- the engine control device 34 can easily perform the regeneration process of the exhaust gas purification device 16 at a temperature as low as possible even during such auto idle control.
- the engine control device 34 performs regeneration.
- the device the intake throttle valve 35, the exhaust throttle valve 36
- the engine control device 34 raises the exhaust temperature of the engine 10 to the low temperature regeneration temperature t1 (for example, t1 ⁇ 250 ° C.) simply by setting the engine rotation number N to the regeneration processing rotation number N1.
- the engine control device 34 performs the low temperature regeneration processing to raise the temperature t of the exhaust gas to the low temperature regeneration temperature t1, thereby reducing the temperature of the particulate matter deposited on the particulate matter removal filter 19 It is possible to burn it off, and the filter 19 can be regenerated smoothly. That is, the engine control unit 34 increases the engine speed N to the regeneration process speed N1 higher than the auto idle speed Nai, thereby reducing the temperature required to regenerate the exhaust gas purification device 16 (low temperature regeneration temperature The temperature t of the exhaust gas can be easily increased to t1), and the regeneration process of the exhaust gas purification device 16 can be performed at a temperature as low as possible.
- the engine control device 34 employed in the first embodiment can reduce the rotational speed N of the engine 10 even when the temperature t of the exhaust gas is decreasing due to no load or light load operation of the engine 10 accompanying the auto idle control. Can be increased to the number of revolutions N1 for regeneration processing. Thereby, the temperature t of the exhaust gas is raised to the temperature required to regenerate the exhaust gas purification device 16. As a result, the engine control device 34 can burn the particulate matter deposited on the particulate matter removal filter 19 to regenerate the filter, and the exhaust gas purification process can be stably performed.
- FIG. 7 shows a second embodiment of the present invention.
- the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof will be omitted. It shall be.
- the feature of the second embodiment is that, when the regeneration process of the exhaust gas purification device 16 is performed, the number of revolutions of the engine 10 until the temperature t of the exhaust gas reaches the temperature for regeneration treatment (low temperature regeneration temperature t1) Is to be configured to gradually raise the
- the engine control unit 34 performs the processing in steps 11 to 13 in the same manner as in steps 1 to 3 shown in FIG. 6 according to the first embodiment. Also, the processing from step 14 to step 18 is performed in the same manner as step 5 to step 9 shown in FIG. That is, in the second embodiment, since the processes of steps 19 to 20 described later are performed, the process of step 4 shown in FIG. 6 can be omitted.
- step 18 in FIG. 7 control is performed to increase the engine speed N from the auto idle speed Nai to the speed N1 for regeneration processing, as in step 9 shown in FIG.
- the engine control unit 34 executes a low temperature regeneration process using the intake throttle valve 35 and / or the exhaust throttle valve 36.
- ⁇ N for example, 50 min ⁇ 1
- the process returns in the next step 13 and the processing after the step 11 is continued.
- the engine speed N is controlled to the speed N1 for the regeneration process, and the low temperature regeneration process is executed. That is, the temperature t of the exhaust gas becomes equal to or higher than the low temperature regeneration temperature t1, and the low temperature regeneration processing using the regeneration device (for example, the intake throttle valve 35 and / or the exhaust throttle valve 36) is performed.
- the particulate matter removal filter 19 of the exhaust gas purification device 16 can burn the deposited particulate matter and regenerate the filter 19.
- the engine control device 34 can raise the temperature t of the exhaust gas to the low temperature regeneration temperature t1 or more by the regeneration device, and the first embodiment The same effect can be obtained.
- the rotational speed N of the engine 10 is determined in advance until the temperature t of the exhaust gas reaches the low temperature regeneration temperature t1 or more.
- the number of revolutions ⁇ N (for example, 50 min ⁇ 1 ) is increased.
- the temperature t of the exhaust gas is raised to the temperature necessary to regenerate the exhaust gas purification device 16, and the regeneration treatment of the exhaust gas purification device 16 can be performed at a temperature as low as possible.
- FIG. 8 and FIG. 9 show a third embodiment of the present invention, and in the third embodiment, the same components as those in the first embodiment described above are assigned the same reference numerals. , Shall be omitted.
- the feature of the third embodiment is that the regeneration processing of the exhaust gas purification device 16 is prevented from being continued in the low rotation number state of the engine 10 (that is, the rotation number lower than the rotation number N1 for regeneration processing). Therefore, the engine 10 is stopped after the auto idle control is performed for a predetermined time.
- the engine control unit 34 performs the processing in steps 21 to 24 in the same manner as in steps 1 to 4 shown in FIG. 6 according to the first embodiment.
- the actual rotation number (engine rotation number N) detected by the rotation sensor 31 attached to the engine 10 is a rotation number equal to or higher than the regeneration processing rotation number N1. That's the case. Therefore, the processing from step 25 to step 29 is performed similarly to step 5 to step 9 shown in FIG.
- the actual rotation speed (engine rotation speed N) detected by the rotation sensor 31 attached to the engine 10 is the rotation speed for regeneration processing.
- the rotation speed is lower than N1. Therefore, there is a possibility that the regeneration process of the exhaust gas purification device 16 is continued at a rotational speed lower than the rotational speed N1 for the regeneration process of the engine 10.
- steps 30 to 34 shown in FIG. 9 the same control processing as steps 5 to 7 in FIG. 6 described above is performed. However, if “YES” is determined in step 34, even if the particulate matter removal filter 19 of the exhaust gas purification device 16 is to be regenerated, the actual number of revolutions detected by the revolution sensor 31 of the engine 10 (engine revolution number N) is a rotation number lower than the rotation number N1 for regeneration processing.
- step 34 when it is determined “YES” in step 34, it is difficult to raise the temperature t of the exhaust gas to the low temperature regeneration temperature t1 (for example, 250 ° C.). For this reason, it can be judged that the particulate matter removal filter 19 of the exhaust gas purification device 16 remains without burning the accumulated particulate matter, and the filter 19 can not be regenerated.
- the low temperature regeneration temperature t1 for example, 250 ° C.
- the auto idle rotation speed Nai is selected as the target rotation speed of the engine 10, and control is performed to reduce the engine rotation speed N to the auto idle rotation speed Nai.
- the next step 36 it is determined whether or not a predetermined time T2 which has been determined in advance has elapsed after the engine speed N is reduced to the auto idle speed Nai. While "NO" is determined in step 36, the process waits for the predetermined time T2 to elapse.
- the process proceeds to the next step 37 to perform control to stop the engine 10.
- the regeneration process of the exhaust gas purification device 16 by the regeneration device for example, the intake throttle valve 35 and / or the exhaust throttle valve 36
- the regeneration device for example, the intake throttle valve 35 and / or the exhaust throttle valve 36
- the regeneration device can be continued wastefully at a rotational speed lower than the engine speed N1 for regeneration processing.
- step 7 shown in FIG. 6 is a specific example of the regeneration determination means which is a component of the present invention, and step 9 shows a specific example of the engine speed increasing means.
- step 16 shown in FIG. 7 is a specific example of the regeneration determination means, and step 18 shows a specific example of the engine speed increasing means.
- the process of step 24 shown in FIG. 8 is a specific example of the rotational speed judging means
- the process of step 27 in FIG. 8 and the process of step 34 shown in FIG. Step 29 is a specific example of the engine speed increasing means.
- the process of step 35 shown in FIG. 9 is a specific example of the idle speed control
- the process of steps 36 and 37 is a specific example of the engine stopping means.
- At least one of the intake throttle valve 35 provided on the intake side of the engine 10 and the exhaust throttle valve 36 provided on the exhaust side in the first embodiment is driven in the valve closing direction.
- the low temperature regeneration process for raising the exhaust gas temperature of 10 is described as an example. However, the present invention is not limited to this. For example, by switching the fuel injection pattern using an electronic control type fuel injection device, a low temperature regeneration process may be performed to raise the temperature of the exhaust gas. And this point is the same as in the second and third embodiments.
- the construction machine provided with the exhaust gas purification device according to the present invention is not limited to this, and may be applied to, for example, medium-sized or larger hydraulic shovels.
- the present invention can be widely applied to hydraulic excavators equipped with wheel-type undercarriage, wheel loaders, hawk lifts, and construction machines for hydraulic cranes.
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Abstract
Description
2 下部走行体(車体)
4 上部旋回体(車体)
5 作業装置
6 旋回フレーム(フレーム)
9 カウンタウエイト
10 エンジン(原動機)
11 吸気管
12 排気管
13 油圧ポンプ
15 熱交換器
16 排気ガス浄化装置
17 ケーシング
18 酸化触媒(触媒手段)
19 粒子状物質除去フィルタ(粒子状物質除去手段)
21 排気温センサ(温度検出器)
22,23 ガス圧センサ(圧力検出器)
24 油圧アクチュエータ
25 コントロールバルブ(方向制御弁)
26 パイロットポンプ
27 パイロット操作弁
27A 操作レバー
28 操作検出器
29 回転数指示装置
30 オートアイドル選択スイッチ(オートアイドル選択手段)
31 回転センサ
32 制御装置
33 車体制御装置
34 エンジン制御装置
35 吸気絞り弁(再生装置)
36 排気絞り弁(再生装置)
37 トルク特性
38 通常運転時で排気温度が250℃の等排気温度線図
39 再生時で排気温度が250℃の等排気温度線図
40 特性線
41 連れ回り時の作動点
Claims (5)
- 原動機としてのエンジン(10)と、該エンジン(10)の排気側に設けられ排気ガスを浄化する排気ガス浄化装置(16)と、該排気ガス浄化装置(16)の再生処理を行う再生装置(35,36)と、前記エンジン(10)によって駆動されタンク内の作動油を吸込んで圧油を吐出する油圧ポンプ(13)と、該油圧ポンプ(13)から吐出された圧油により駆動される少なくとも1つ以上の油圧アクチュエータ(24)と、該油圧アクチュエータ(24)と前記油圧ポンプ(13)との間に設けられ該油圧アクチュエータ(24)に対する圧油の供給を制御する方向制御弁(25)と、前記エンジン(10)の回転数(N)を指示する回転数指示装置(29)と、前記エンジン(10)の回転数を予め決められたオートアイドル回転数(Nai)まで下げるためのオートアイドル選択手段(30)と、常時は前記回転数指示装置(29)による指示値に従って前記エンジン(10)の回転数(N)を制御し前記方向制御弁(25)が中立位置にあるときには前記指示値に拘りなく前記オートアイドル選択手段(30)によるオートアイドル回転数(Nai)で前記エンジン(10)の回転数(N)を制御するエンジン制御装置(34)とを備えてなる建設機械において、
前記エンジン制御装置(34)は、
前記オートアイドル選択手段(30)によるオートアイドル回転数(Nai)で前記エンジン(10)の回転数(N)を制御しているときに、前記再生装置(35,36)によって前記排気ガス浄化装置(16)の再生処理を行うか否かを判定する再生判定手段と、
該再生判定手段によって前記再生処理を行うと判定したときには、前記エンジン(10)の回転数(N)を前記オートアイドル回転数(Nai)よりも高い再生処理用回転数(N1)まで上昇させるエンジン回転数上昇手段とを備える構成としたことを特徴とする建設機械。 - 前記エンジン(10)の回転数(N)が前記再生処置用回転数(N1)まで上昇したときには、前記排気ガスの温度(t)が前記排気ガス浄化装置(16)の再生処理に必要な温度(t1 )まで上昇する構成としてなる請求項1に記載の建設機械。
- 前記排気ガス浄化装置(16)には前記排気ガスの温度(t)を検出する温度検出器(21)を設け、前記エンジン制御装置(34)の前記エンジン回転数上昇手段は、前記再生判定手段によって再生処理を行うと判定したときに、前記排気ガスの温度(t)が前記再生処理用の温度(t1 )に達するまで前記エンジン(10)の回転数を上昇させる構成としてなる請求項1に記載の建設機械。
- 前記エンジン(10)の回転数を検出する回転センサ(31)を備え、前記エンジン制御装置(34)は、該回転センサ(31)で検出した前記エンジン(10)の回転数(N)が前記再生処理用回転数(N1)と同等以上の回転数であるか否かを判定する回転数判定手段と、該回転数判定手段によって前記エンジン(10)の回転数(N)が前記再生処理用回転数(N1)よりも低い回転数と判定し、かつ前記再生判定手段によって前記再生処理を行うと判定したときに前記エンジン(10)の回転数(N)を前記オートアイドル回転数(Nai)に制御するアイドル回転数制御手段と、該アイドル回転数制御手段により前記エンジン(10)の回転数(N)を前記オートアイドル回転数(Nai)に制御した状態で予め決められた時間(T2 )が経過したときに前記エンジン(10)を停止させる制御を行うエンジン停止手段とを備える構成としてなる請求項1に記載の建設機械。
- 前記再生装置は、前記エンジン(10)の吸気側と排気側のうち少なくとも一方側に設けた絞り弁(35,36)により前記排気ガスの温度を上昇させるための低温再生処理を行う構成としてなる請求項1に記載の建設機械。
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KR1020137029846A KR20140035371A (ko) | 2011-06-14 | 2012-05-24 | 건설 기계 |
US14/005,898 US8869928B2 (en) | 2011-06-14 | 2012-05-24 | Construction machine |
EP12800119.5A EP2722502A4 (en) | 2011-06-14 | 2012-05-24 | CONSTRUCTION MACHINE |
CN201280029320.9A CN103597178B (zh) | 2011-06-14 | 2012-05-24 | 工程机械 |
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US (1) | US8869928B2 (ja) |
EP (1) | EP2722502A4 (ja) |
JP (1) | JPWO2012172951A1 (ja) |
KR (1) | KR20140035371A (ja) |
CN (1) | CN103597178B (ja) |
WO (1) | WO2012172951A1 (ja) |
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JP2014224485A (ja) * | 2013-05-15 | 2014-12-04 | 日立建機株式会社 | 建設機械の排気ガス浄化システム |
CN103924627A (zh) * | 2014-04-15 | 2014-07-16 | 华侨大学 | 一种电液混合驱动工程机械的自动怠速***及方法 |
CN103924627B (zh) * | 2014-04-15 | 2016-02-24 | 华侨大学 | 一种电液混合驱动工程机械的自动怠速***及方法 |
JP2017048521A (ja) * | 2015-08-31 | 2017-03-09 | 株式会社クボタ | 作業機 |
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CN103597178A (zh) | 2014-02-19 |
EP2722502A1 (en) | 2014-04-23 |
EP2722502A4 (en) | 2015-06-17 |
JPWO2012172951A1 (ja) | 2015-02-23 |
CN103597178B (zh) | 2016-02-24 |
US8869928B2 (en) | 2014-10-28 |
US20140008140A1 (en) | 2014-01-09 |
KR20140035371A (ko) | 2014-03-21 |
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