WO2013021703A1 - 作業機械のエンジン制御システム - Google Patents

作業機械のエンジン制御システム Download PDF

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Publication number
WO2013021703A1
WO2013021703A1 PCT/JP2012/062417 JP2012062417W WO2013021703A1 WO 2013021703 A1 WO2013021703 A1 WO 2013021703A1 JP 2012062417 W JP2012062417 W JP 2012062417W WO 2013021703 A1 WO2013021703 A1 WO 2013021703A1
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WO
WIPO (PCT)
Prior art keywords
engine
exhaust gas
sulfur concentration
sulfur
fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/062417
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English (en)
French (fr)
Japanese (ja)
Inventor
吉田　肇
石井　元
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to KR1020147000399A priority Critical patent/KR20140047068A/ko
Priority to US14/125,108 priority patent/US20140116031A1/en
Priority to EP12822316.1A priority patent/EP2743481A1/en
Priority to CN201280034100.5A priority patent/CN103703232A/zh
Publication of WO2013021703A1 publication Critical patent/WO2013021703A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus
    • 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
    • E02F9/26—Indicating devices
    • E02F9/267—Diagnosing or detecting failure of vehicles
    • E02F9/268—Diagnosing or detecting failure of vehicles with failure correction follow-up actions
    • 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
    • F02D29/04—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 peculiar to engines driving pumps
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • 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
    • 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
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/065—Introducing corrections for particular operating conditions for engine starting or warming up for starting at hot start or restart
    • 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
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • 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 an engine control system for a work machine such as a hydraulic excavator, and more particularly to an engine control system for a work machine equipped with an exhaust gas aftertreatment device (hereinafter referred to as DPF) that collects particulate matter contained in engine exhaust gas. .
  • DPF exhaust gas aftertreatment device
  • DPF Diesel Particulate Filter
  • PM particulate matter
  • Patent Document 1 an exhaust gas analyzer is installed in an exhaust system in a work machine equipped with such a DPF, and the concentration of a substance such as sulfur dioxide in the exhaust gas is measured by the exhaust gas analyzer, and fuel identifying means is provided. The specification of the fuel used is described.
  • an exhaust gas analyzer is provided in the exhaust system, the concentration of a substance such as sulfur dioxide is measured by the exhaust gas analyzer, and the fuel to be used is determined by the fuel identifying means. I have identified.
  • the concentration of the sulfur dioxide substance is generally measured using a detection means such as an SOx sensor.
  • a detection means such as an SOx sensor.
  • the concentration of the dioxide is low.
  • the concentration of sulfur substances cannot be measured correctly.
  • the concentration of sulfur dioxide or the like cannot be measured correctly, there is a possibility that sulfur dioxide or the like is erroneously detected.
  • An engine control system is provided.
  • the present invention provides a diesel engine, an exhaust gas aftertreatment device provided in an exhaust system of the engine, a hydraulic pump driven by the engine, and a discharge from the hydraulic pump.
  • An exhaust gas purification system for a hydraulic working machine comprising a hydraulic system including at least one hydraulic actuator driven by pressurized oil, an exhaust temperature detection device for detecting the temperature of the exhaust gas of the engine, and the exhaust gas of the engine
  • a sulfur concentration detector that detects the sulfur concentration in the interior
  • an alarm device a control device that performs a sulfur concentration measurement process based on the detected value of the exhaust gas temperature detector and the detected value of the sulfur concentration detector
  • the exhaust gas temperature detected by the exhaust gas temperature detecting device in the sulfur concentration measurement process is exhausted.
  • the sulfur concentration in the engine is within a predetermined temperature range suitable for measuring the sulfur concentration in the engine
  • the sulfur concentration in the exhaust gas of the engine is measured using the sulfur concentration detector, and the sulfur concentration is determined in advance.
  • the alarm device is actuated when the threshold is exceeded.
  • the sulfur concentration in the engine exhaust gas is measured, thereby The sulfur concentration of the exhaust gas aftertreatment device is minimized by activating the alarm device when the sulfur concentration in the gas is measured correctly and the measured sulfur concentration is above a predetermined threshold.
  • the problem of the exhaust gas aftertreatment device can be prevented in advance.
  • the engine control system of the work machine further includes a key switch for starting the engine and a fuel oil amount detection device for detecting a remaining amount of fuel supplied to the engine.
  • the control device detects the remaining amount of fuel stored in the storage device when the engine is stopped last time and the remaining amount of fuel detected by the fuel oil amount detection device when the engine is started this time. The sulfur concentration measurement process is performed only when the remaining amount of fuel has increased.
  • the engine control system of the work machine further includes an engine speed instruction device that instructs the target engine speed of the engine, and the control device performs the sulfur concentration measurement process.
  • the engine speed is controlled. Regardless of the instruction of the target rotational speed by the number indicating device, the engine rotational speed is forcibly controlled to be a predetermined target rotational speed suitable for measuring the sulfur concentration in the exhaust gas.
  • the engine speed is forcibly set to a predetermined value suitable for measuring the sulfur concentration in the exhaust gas, regardless of the instruction of the target speed by the engine speed indicator.
  • the fixed control to achieve the target rotational speed ensures that the exhaust gas temperature is controlled within a predetermined temperature range suitable for the measurement of the sulfur concentration in the exhaust gas, and the measurement accuracy with the efficiency of the sulfur concentration measurement process Can be increased.
  • the present invention it is possible to correctly measure the sulfur concentration in the exhaust gas, which is harmful when the exhaust gas aftertreatment device functions normally, to minimize sulfur poisoning of the exhaust gas aftertreatment device, and It is possible to prevent problems with the post-processing apparatus.
  • the fuel supply is usually performed with the engine stopped.
  • the sulfur concentration measurement process is performed every time the engine is started after fuel supply. Necessity is automatically determined, and the sulfur concentration measurement process can be performed only when necessary. As a result, the frequency of the sulfur concentration measurement process can be reduced, and a decrease in the operating efficiency of the work machine due to the sulfur concentration measurement process can be minimized.
  • the engine rotation speed is forcibly measured to measure the sulfur concentration in the exhaust gas regardless of the target rotation speed instruction by the engine rotation speed instruction device.
  • the exhaust gas temperature is reliably controlled within a predetermined temperature range suitable for the measurement of the sulfur content concentration in the exhaust gas, and the efficiency of the sulfur content measurement process is controlled. Measurement accuracy can be improved.
  • the engine is automatically stopped to strongly encourage the operator to change the fuel when the fuel has a high sulfur concentration, and in this respect as well, sulfur poisoning of the exhaust gas aftertreatment device is minimized. Can be stopped.
  • FIG. 4 is a flowchart subsequent to the flowchart of FIG. 3, showing the processing contents of sulfur concentration detection control and engine control of the vehicle body control device. It is a figure which shows the relationship between an engine speed and exhaust gas temperature.
  • FIG. 1 is a diagram showing an entire drive system including an engine control system for a work machine according to a first embodiment of the present invention.
  • the drive system for a hydraulic excavator includes an engine 1, a hydraulic system 2, an exhaust gas aftertreatment device 3, and an engine control system 4.
  • the engine 1 is a diesel engine. As a part of the engine control system 4, the engine 1 includes a rotation speed detection device 43 that detects the actual rotation speed of the engine 1 and an electronic governor that controls fuel supplied to the engine 1. 45 (electronically controlled fuel injection device).
  • the hydraulic system 2 drives a driven member of a hydraulic excavator using the engine 1 as a power source, and includes a variable displacement main hydraulic pump 21 and a fixed displacement pilot pump 22 driven by the engine 1, and hydraulic pressure.
  • An actuator group 23 driven by the pressure oil discharged from the pump 21 to drive the driven member of the hydraulic excavator, and a main spool for controlling the flow (flow rate and direction) of the pressure oil supplied from the hydraulic pump 21 to the actuator group 23
  • a control valve device 24 including a group (flow control valve group), and a remote control valve group for generating a control pilot pressure for operating the main spool group of the control valve device 24 using the pressure oil from the pilot pump 22 as a hydraulic source.
  • an input operation lever device 25 is an input operation lever device 25.
  • the exhaust gas aftertreatment device 3 is attached to an exhaust pipe 31 that is a part of an exhaust system through which exhaust gas of the engine 1 flows, and includes a filter 32a and a filter 32a that collect particulate matter (PM) contained in the exhaust gas.
  • An oxidation catalyst 32b located on the upstream side is incorporated.
  • the exhaust gas aftertreatment device 3 includes an exhaust gas temperature detection device 33 that detects the temperature of the exhaust gas upstream of the filter 32a, and a pressure upstream and downstream of the filter 32a, respectively, as part of the engine control system 4.
  • Exhaust pressure detectors 34a and 34b that respectively detect the side pressures are provided.
  • the exhaust pressure detecting devices 34a and 34b constitute a differential pressure detecting device that detects a differential pressure across the upstream and downstream sides of the filter 32a (pressure loss of the filter 32a).
  • the engine control system 4 is provided in the exhaust pipe 31 of the engine 1, and a sulfur concentration detector 36 that detects the sulfur concentration in the exhaust gas of the engine 1, and a fuel oil amount detector 40 that detects the amount of fuel.
  • An engine control dial 41 (rotation speed indicating device) for instructing the target rotational speed of the engine 1, an alarm display device 42, the exhaust temperature detecting device 33, the exhaust pressure detecting devices 34a and 34b, and the rotational speed detecting device 43 described above.
  • the electronic governor 45, the key switch 46, the vehicle body control device 51, and the engine control device 52 are provided.
  • the vehicle body control device 51 includes a detection signal from the exhaust temperature detection device 33, a detection signal from the sulfur concentration detection device 36, a detection signal from the fuel oil amount detection device 40, and a command signal from the engine control dial 41. Then, a detection signal from the rotation speed detection device 43 and a command signal from the key switch 46 are input, a predetermined calculation process is performed, and the target rotation speed and sulfur content concentration indicated by the engine control dial 41 to the engine control device 52 are performed. While outputting one of the command signals for the target rotational speed for the measurement processing, and determining that the fuel having a high sulfur content is being used, an operation signal is output to the alarm display device 42.
  • the vehicle body control device 51 inputs the detection signal from the exhaust temperature detection device 33, the detection signal from the sulfur concentration detection device 36, and the detection signal from the rotation speed detection device 43 via the engine control device 52.
  • the engine control device 52 receives the command signal for the target rotational speed from the vehicle body control device 51 and the detection signal for the engine rotational speed from the rotational speed detection device 43, performs predetermined calculation processing, and supplies the target fuel to the electronic governor 45. Outputs the injection amount control signal.
  • the electronic governor 45 controls the fuel injection amount supplied to the engine 1 based on the control signal, and controls so that the rotational speed of the engine 1 is maintained at the target rotational speed of the command signal from the vehicle body control device 51. .
  • the engine control device 52 receives detection signals from the differential pressure detection devices 34a and 34b, and performs control to regenerate the filter 32a (combustion removal of particulate matter collected by the filter 32a) as follows. .
  • the engine control device 52 determines whether or not the differential pressure across the filter 32a indicated by the detection signals from the differential pressure detection devices 34a and 34b has exceeded a regeneration start determination threshold value, and when it exceeds the regeneration start determination threshold value, the regeneration of the filter 32a is performed. Is determined to be necessary, and reproduction control is started.
  • This regeneration control is performed, for example, by performing regeneration fuel injection into the exhaust pipe 31. When fuel is injected into the exhaust pipe 31, part of the injected fuel burns to raise the temperature of the exhaust gas, and unburned fuel is supplied to the oxidation catalyst 32b and oxidized by the oxidation catalyst 32b.
  • the exhaust gas temperature further rises due to the reaction heat sometimes obtained, and the PM deposited on the filter 32a is burned and removed by the high-temperature exhaust gas.
  • the fuel injection for regeneration uses, for example, an in-cylinder (in-cylinder) injection system of the engine 1 by the electronic governor 45, and performs sub-injection (post-injection) that injects fuel in the expansion stroke after the main injection of multistage injection. Can be done. Further, a fuel injection device for regeneration may be installed in the exhaust pipe 31 and the fuel injection for regeneration may be performed by operating this fuel injection device.
  • This regeneration control is performed until the differential pressure across the filter 32a indicated by the detection signals from the differential pressure detectors 34a and 34b falls below the regeneration end determination threshold, and when the differential pressure across the filter 32a falls below the regeneration end determination threshold, the exhaust pipe The fuel injection for regeneration into 31 is stopped, and regeneration control is ended.
  • FIG. 2 is a diagram showing the external appearance of a hydraulic excavator provided with the drive system shown in FIG.
  • the hydraulic excavator includes a lower traveling body 100, an upper swing body 101, and a front work machine 102.
  • the lower traveling body 100 has left and right crawler traveling devices 103a and 103b, and is driven by left and right traveling motors 104a and 104b.
  • the upper swing body 101 is turnably mounted on the lower traveling body 100 by the swing motor 105, and the front work machine 102 is attached to the front portion of the upper swing body 101 so as to be able to be raised and lowered.
  • the upper swing body 101 is provided with an engine room 106 and a cabin (operating room) 107.
  • the engine 1, the hydraulic pump 21, the pilot pump 22, the exhaust gas aftertreatment device 3 and the like are arranged in the engine room 106.
  • Input operation levers 25 are arranged on the left and right sides of the driver's seat.
  • the vehicle body control device 51 and the engine control device 52 are disposed, for example, below the driver's seat in the cabin 107.
  • the front work machine 102 has an articulated structure having a boom 111, an arm 112, and a bucket 113.
  • the boom 111 rotates in the vertical direction by expansion and contraction of the boom cylinder 114.
  • the bucket 113 is rotated up and down and back and forth by the expansion and contraction of the bucket cylinder 116.
  • the left and right traveling motors 104a and 104b, the turning motor 105, the boom cylinder 114, the arm cylinder 115, and the bucket cylinder 116 constitute the actuator group 23 shown in FIG. ⁇
  • Control contents ⁇ FIG. 3 and FIG. 4 are flowcharts showing the processing contents of the sulfur concentration measurement process and engine control of the vehicle body control device 51.
  • Step S100 (FIG. 3)>
  • the vehicle body control device 51 inputs a command signal of the key switch 46, and when the key switch 46 is turned on, the program is activated and the processing shown in the flowcharts of FIGS. 3 and 4 is started.
  • Step S110 (FIG. 3)>
  • the vehicle body control device 51 inputs a detection signal from the fuel oil amount detection device 40 every time the engine is started when the key switch 46 is turned on in order to determine whether or not the sulfur concentration measurement processing is necessary, and the previous engine stop is performed.
  • the remaining amount of fuel stored in the storage device 51a of the vehicle body control device 51 (see step S330 in FIG. 4) is compared with the remaining amount of fuel at the time of starting the engine to determine whether the remaining amount of fuel has increased.
  • Step S120 (FIG. 3)> If it is determined in step S110 that the remaining amount of fuel at the start of the engine is increased, the vehicle body control device 51 determines that the sulfur concentration measurement process is necessary, and sets the fuel abnormality flag F. Reset to OFF.
  • Step S130 (FIG. 3)>
  • the vehicle body control device 51 performs a sulfur concentration measurement process.
  • the vehicle body control device 51 outputs a command signal for a predetermined target rotational speed Na suitable for measuring the sulfur concentration in the exhaust gas set in advance for the sulfur concentration measurement process.
  • the command signal for the target rotational speed Na is output in preference to the command signal for the target rotational speed from the engine control dial 41.
  • the target rotational speed Na is, for example, a rotational speed about the medium speed rotational speed.
  • the engine controller 52 When the engine control device 52 receives a command signal for the target engine speed Na, the engine controller 52 sends a control signal for the target fuel injection amount to the electronic governor 45 based on the target engine speed Na and the actual engine speed detected by the engine speed detector 43. Based on the control signal, the electronic governor 45 controls so that the rotational speed of the engine 1 becomes the target rotational speed Na.
  • the rotational speed of the engine 1 is forcibly set to sulfur in the exhaust gas. Fixed control is performed so that the target rotational speed Na is suitable for the measurement of the partial concentration.
  • Step S140 (FIG. 3)>
  • the vehicle body control device 51 inputs a detection signal from the rotational speed detection device 43, and the target rotational speed Na of the command signal from the vehicle body control device 51 and the actual rotational speed of the engine 1 detected by the rotational speed detection device 43.
  • N is compared to determine whether the actual engine speed N of the engine 1 is less than or equal to the target engine speed Na.
  • the procedure of step S140 is repeated.
  • Step S150 (FIG. 3)> Further, the vehicle body control device 51 inputs a detection signal from the exhaust temperature detection device 33, and uses a predetermined temperature range Texa to Texb suitable for measurement of the sulfur concentration in the exhaust gas set in advance and the exhaust temperature detection device 33. The detected temperature Tex of the exhaust gas is compared, and it is determined whether or not the temperature Tex of the exhaust gas is within a predetermined temperature range Texa to Texb suitable for measuring the sulfur concentration in the exhaust gas. If it is determined that the temperature Tex of the exhaust gas is not within the predetermined temperature range Texa to Texb, the procedure of steps S140 and S150 is repeated.
  • FIG. 5 is a diagram showing the relationship between the engine speed and the exhaust gas temperature.
  • the exhaust gas temperature increases as the engine speed increases. Even if the engine speed is constant, the exhaust gas temperature varies within a predetermined range depending on the environmental conditions (such as air temperature) and vehicle body conditions (such as the magnitude of the engine drag load such as whether or not an air conditioner is used). .
  • the target rotational speed Na by setting an appropriate value as the target rotational speed Na, it is possible to obtain an exhaust gas temperature in a predetermined temperature range Texa to Texb suitable for measuring the sulfur concentration in the exhaust gas.
  • Step S160 (FIG. 3)> If it is determined in step S140 that the actual engine speed is within the target engine speed range Na, and it is determined in step S150 that the exhaust gas temperature Texa is within the predetermined temperature range Texa to Texb, The control device 51 compares the subsequent elapsed time T with a preset target time Ta, and determines whether or not the elapsed time T has reached the target time Ta. If it is determined that the elapsed time T has not reached the target time Ta, the procedures of steps S140, S150, and S160 are repeated.
  • Step S170 (FIG. 3)> If it is determined in step S160 that the elapsed time T has reached the target time Ta, the vehicle body control device 51 inputs a detection signal from the sulfur concentration detection device 36 and sets the target sulfur in the preset exhaust gas. The sulfur concentration in the exhaust gas detected by the sulfur concentration detector 36 is compared with the sulfur concentration (threshold) to determine whether the sulfur concentration in the exhaust gas is equal to or higher than the target sulfur concentration (threshold). To do.
  • Step S180 (FIG. 3)>
  • the vehicle body control device 51 sets the fuel abnormality flag F to ON.
  • Step S190 (FIG. 3)>
  • the vehicle body control device 51 outputs an operation signal to the alarm display device 42 to indicate that the currently used fuel is a fuel having a high sulfur content and that it is necessary to immediately replace the fuel. 42 is displayed.
  • Step S200 (FIG. 3)>
  • the vehicle body control device 51 outputs a command signal for a target rotational speed Nb suitable for stopping the engine lower than the target rotational speed Na suitable for measuring the sulfur concentration in the exhaust gas described above.
  • the output of the command signal for the target rotational speed Nb is also given priority over the instruction for the target rotational speed from the engine control dial 41.
  • the target rotational speed Nb is, for example, a rotational speed that is about the low speed idle rotational speed.
  • the engine control device 52 outputs a control signal for the target fuel injection amount to the electronic governor 45 based on the target rotational speed Nb and the actual rotational speed detected by the rotational speed detection device 43, and the electronic governor 45 Based on the above, control is performed so that the rotational speed of the engine 1 becomes the target rotational speed Nb.
  • the command signal for the target rotational speed from the engine control dial 41 regardless of the target rotational speed instruction from the engine control dial 41.
  • the engine 1 is controlled so that the engine speed becomes the target engine speed Nb suitable for stopping the engine.
  • step S200 the elapsed time T after the command signal for the target rotational speed Nb is output to the engine control device 52 is compared with the target time Tb to determine whether the elapsed time T has reached the target time Tb. .
  • Step S220 (FIG. 3)> If it is determined in step S210 that the elapsed time T has reached the target time Tb, a stop signal for the engine 1 is output to the engine control device 52, and the engine 1 is automatically stopped.
  • Step S230 (FIG. 3)> If it is determined in step S110 that the remaining amount of fuel at the time of starting the engine has not increased, the vehicle body control device 51 determines that the sulfur concentration measurement process is unnecessary. Next, the vehicle body control device 51 determines whether or not the fuel abnormality flag F is OFF. If the fuel abnormality flag F is not OFF (if it is ON), the sulfur concentration in the exhaust gas is once increased in step S170. Since it is a case where the key switch 46 is turned on after the determination that the concentration is higher than the target sulfur concentration (threshold value) and the engine 1 is started, the process proceeds to step S190 to immediately display a warning and to steps S200 to S220. Then, a command signal for the target rotational speed Nb for stopping the engine is output to the engine control device 52, and the engine 1 is stopped after the target time Tb has elapsed.
  • step S310 If it is determined in step S170 that the sulfur concentration in the exhaust gas is not equal to or higher than the target sulfur concentration (threshold), or if it is determined in step S230 that the fuel abnormality flag F is OFF, FIG. Proceed to step S300.
  • step S300 normal engine speed control calculation is performed.
  • a command signal from the engine control dial 41 is input, a target speed based on the command signal is calculated, and a command signal for the target speed is output to the engine control device 52.
  • the vehicle body control device 51 may have an additional engine control function such as auto idle control.
  • the target rotational speed based on the command signal from the engine control dial 41 and the target engine control function One of the rotation speeds is output to the engine control device 52 as a command signal.
  • the engine control device 52 outputs a target fuel injection amount control signal to the electronic governor 45 based on the target rotational speed and the actual rotational speed detected by the rotational speed detection device 43, and the electronic governor 45 outputs the control signal to the control signal. Based on this, control is performed so that the rotational speed of the engine 1 becomes the target rotational speed.
  • Step S320 (FIG. 4)> Next, the vehicle body control device 51 inputs a command signal of the key switch 46 and determines whether or not the key switch 46 is turned OFF and the engine 1 is stopped.
  • Step S330 (FIG. 4)>
  • the vehicle body control device 51 inputs a detection signal from the fuel oil amount detection device 40, and stores the remaining fuel amount detected by the fuel oil amount detection device 40. Store in 51a.
  • the vehicle body control device 51 and the engine control device 52 constitute a control device that performs a sulfur concentration measurement process based on the detection value of the exhaust gas temperature detection device 33 and the detection value of the sulfur concentration detection device 36.
  • the device detects the sulfur content concentration detection device 36.
  • the sulfur concentration in the exhaust gas of the engine 1 is measured and the alarm device (alarm display device 42) is activated when the sulfur concentration is equal to or higher than a predetermined threshold value.
  • control device every time the engine is started when the key switch 46 is turned on, the remaining amount of fuel stored in the storage device 51a when the engine was stopped last time and the remaining amount of fuel detected by the fuel oil amount detection device 40 when the engine was started this time. And the sulfur concentration measurement process is performed only when the remaining amount of fuel is increased.
  • the control device controls the engine speed based on the target engine speed indicated by the engine speed indicating device (engine control dial 41).
  • the engine 1 is forcibly set to the sulfur content in the exhaust gas regardless of the instruction of the target engine speed by the engine speed instruction device (engine control dial 41).
  • the fixed control is performed so that a predetermined target rotational speed Na suitable for density measurement is obtained.
  • the vehicle body control device 51 resets the fuel abnormality flag F to OFF and sulfur.
  • the concentration measurement process is started (steps S100 ⁇ S110 ⁇ S120).
  • the target rotational speed of the engine 1 is fixedly controlled so as to be forcibly the target rotational speed Na suitable for the measurement of the sulfur concentration in the exhaust gas, and the actual rotational speed of the engine 1 is the target.
  • the exhaust gas temperature Tex falls within a predetermined temperature range Texa to Texb suitable for measuring the sulfur content concentration in the exhaust gas and the target time Ta has elapsed, and the sulfur content concentration in the exhaust gas is the target.
  • step S130 It is determined whether or not the sulfur content concentration (threshold value) or more (steps S130 ⁇ S140 ⁇ S150 ⁇ S160 ⁇ S170).
  • the vehicle body control device 51 determines that the sulfur concentration in the exhaust gas is not equal to or higher than the target sulfur concentration (threshold), and performs normal engine speed control. Calculation is performed (step S310). As a result, the operator can work by moving the excavator as usual.
  • the vehicle body control device 51 stores the remaining fuel amount detected by the fuel oil amount detection device 40 It memorize
  • the vehicle body control device 51 When the operator turns on the key switch 46 again and starts the engine 1 after interruption of work such as a lunch break or at the start of the next day's work, the remaining amount of fuel has not increased, and the fuel abnormality flag F is OFF. Therefore, the vehicle body control device 51 immediately performs normal engine speed control calculation (steps S100 ⁇ S110 ⁇ S230 ⁇ S310). As a result, the operator can work by moving the excavator as usual.
  • the vehicle body control device 51 resets the fuel abnormality flag F to OFF and the sulfur concentration
  • the measurement process is started (steps S100 ⁇ S110 ⁇ S120). Also in this sulfur concentration measurement process, the target rotational speed of the engine 1 is fixedly controlled to be forced to the target rotational speed Na, the actual rotational speed of the engine 1 becomes equal to or lower than the target rotational speed Na, and the exhaust gas temperature Tex.
  • Steps S130 ⁇ S140 ⁇ S150 ⁇ S160 ⁇ S170 the vehicle body control device 51 determines that the sulfur concentration in the exhaust gas is equal to or higher than the target sulfur concentration (threshold), and turns on the fuel abnormality flag F.
  • the alarm display unit 42 displays that the fuel currently in use is a fuel having a high sulfur concentration and that the fuel needs to be replaced immediately (steps S180 ⁇ S190).
  • the engine 1 is forcibly controlled to a target rotational speed Nb suitable for stopping the engine to reduce the rotational speed of the engine 1, and when this state passes the target time Tb, the engine is stopped (steps S200 ⁇ S210 ⁇ S220).
  • the device 51 immediately activates the alarm display device 42 to display that the fuel currently in use is a fuel having a high sulfur concentration and that it is necessary to immediately replace the fuel, and forcibly activate the engine 1.
  • the target engine speed Nb is controlled to decrease the engine speed, and when the target time Tb has elapsed, the engine is stopped (steps S100 ⁇ S110 ⁇ S230 ⁇ S190 ⁇ S200 ⁇ S210 ⁇ S220).
  • the exhaust gas aftertreatment is performed in order to measure the sulfur concentration in the exhaust gas of the engine 1.
  • the sulfur concentration in the exhaust gas which is harmful for the normal functioning of the device 3
  • the correctly measured sulfur concentration is equal to or greater than a predetermined threshold value.
  • the fuel remaining amount at the previous engine stop and the fuel remaining at the current engine start are compared, and only when the fuel remaining amount has increased, the sulfur concentration
  • the fuel supply is usually performed with the engine 1 stopped.
  • the sulfur concentration measurement process is performed every time the engine is started after the fuel supply. Is automatically determined, and the sulfur concentration measurement process can be performed only when necessary. As a result, the frequency of the sulfur concentration measurement process can be reduced, and a decrease in the operating efficiency of the work machine due to the sulfur concentration measurement process can be minimized.
  • the rotation speed of the engine 1 is forcibly set regardless of the instruction of the target rotation speed from the engine control dial 41 (engine rotation speed indicating device).
  • the exhaust gas temperature is reliably controlled within a predetermined temperature range suitable for the measurement of the sulfur content concentration in the exhaust gas, and the sulfur content concentration is measured. The measurement accuracy with the processing efficiency can be increased.
  • the fuel remaining amount is increased by comparing the fuel remaining amount at the previous engine stop with the fuel remaining amount at the current engine starting.
  • the exhaust gas temperature is always detected during normal operation (working), and the exhaust gas temperature falls within a predetermined temperature range suitable for measuring the sulfur concentration. Only at certain times may the sulfur concentration be measured. Even in this case, when the sulfur concentration is equal to or higher than a predetermined threshold value, the alarm display device 42 is operated to correctly measure the sulfur concentration in the exhaust gas, and the exhaust gas aftertreatment device 3 sulfur. Poisoning can be minimized and problems with the exhaust gas aftertreatment device 3 can be prevented.
  • a switch for instructing the sulfur concentration measurement process may be provided, and after the engine is started, the start of the sulfur concentration measurement process is instructed by an operator's switch operation, and the sulfur concentration measurement process may be performed.
  • the alarm display device 42 is provided as an alarm device, and the alarm display device 42 is provided with the content of the alarm (the fuel currently in use is a fuel having a high sulfur content and the fuel needs to be replaced immediately.
  • the fuel currently in use is a fuel having a high sulfur content and the fuel needs to be replaced immediately.
  • a speaker as an alarm device and notify the content of the alarm by voice.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
PCT/JP2012/062417 2011-08-08 2012-05-15 作業機械のエンジン制御システム Ceased WO2013021703A1 (ja)

Priority Applications (4)

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KR1020147000399A KR20140047068A (ko) 2011-08-08 2012-05-15 작업 기계의 엔진 제어 시스템
US14/125,108 US20140116031A1 (en) 2011-08-08 2012-05-15 Engine control system for working machine
EP12822316.1A EP2743481A1 (en) 2011-08-08 2012-05-15 Engine control system for work machine
CN201280034100.5A CN103703232A (zh) 2011-08-08 2012-05-15 作业机械的发动机控制系统

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JP2011173290A JP2013036393A (ja) 2011-08-08 2011-08-08 作業機械のエンジン制御システム

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WO2015022568A1 (en) * 2013-08-14 2015-02-19 Toyota Jidosha Kabushiki Kaisha Control system and control method for internal combustion engine
WO2015025205A1 (en) * 2013-08-23 2015-02-26 Toyota Jidosha Kabushiki Kaisha Control device and control method for internal combustion engine
WO2015025202A1 (en) * 2013-08-23 2015-02-26 Toyota Jidosha Kabushiki Kaisha Control apparatus and control method for internal combustion engine
CN104405486A (zh) * 2013-06-28 2015-03-11 康明斯有限公司 提高scr系统的高抗硫性的模拟燃料硫传感器
US10551364B2 (en) 2014-02-20 2020-02-04 Toyota Jidosha Kabushiki Kaisha Control system and control method for internal combustion engine

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US9299109B2 (en) * 2014-07-17 2016-03-29 Kenneth Carl Steffen Winiecki Motor vehicle monitoring method for determining driver negligence of an engine
CN106715802B (zh) * 2014-12-05 2020-03-06 住友重机械工业株式会社 挖土机及挖土机的控制方法
AU2019364649B8 (en) * 2018-10-26 2025-08-07 K&N Engineering, Inc. Turbo-boost control system
CN110761883A (zh) * 2019-12-27 2020-02-07 潍柴动力股份有限公司 预测硫中毒的方法及设备
CN114233471B (zh) * 2021-12-24 2022-11-22 湖南道依茨动力有限公司 高硫油的识别及后处理方法、装置和作业车辆
CN114856781A (zh) * 2022-05-09 2022-08-05 三一重机有限公司 作业机械发动机保护方法、装置及作业机械
CN116008483A (zh) * 2023-01-09 2023-04-25 一汽解放汽车有限公司 含硫量检测方法、装置、设备及介质

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WO2015025205A1 (en) * 2013-08-23 2015-02-26 Toyota Jidosha Kabushiki Kaisha Control device and control method for internal combustion engine
WO2015025202A1 (en) * 2013-08-23 2015-02-26 Toyota Jidosha Kabushiki Kaisha Control apparatus and control method for internal combustion engine
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JP2013036393A (ja) 2013-02-21
US20140116031A1 (en) 2014-05-01
KR20140047068A (ko) 2014-04-21
EP2743481A1 (en) 2014-06-18

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