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 PDFInfo
- 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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- WIPO (PCT)
- Prior art keywords
- engine
- exhaust gas
- sulfur concentration
- sulfur
- fuel
- Prior art date
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Classifications
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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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- 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.g. for catalytic activity
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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
- E02F9/26—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
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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
- F02D41/14—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
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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
- F02D41/0025—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
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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
-
- 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
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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 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.
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Abstract
Description
<第1の実施の形態>
~構成~
図1は本発明の第1の実施の形態における作業機械のエンジン制御システムを含む駆動システム全体を示す図である。
~制御内容~
図3及び図4は、車体制御装置51の硫黄分濃度測定処理及びエンジン制御の処理内容を示すフローチャートである。
車体制御装置51はキースイッチ46の指令信号を入力し、キースイッチ46がONとなるとプログラムが起動し、図3及び図4のフローチャートに示す処理が開始される。
まず、車体制御装置51は、硫黄分濃度測定処理の要否を判定するため、キースイッチ46がONするエンジン始動毎に、燃料油量検出装置40からの検出信号を入力し、前回のエンジン停止時に車体制御装置51の記憶装置51aに記憶した燃料残量(図4のステップS330参照)と今回のエンジン始動時の燃料残量とを比較し、燃料残量が増えているかどうかを判定する。
ステップS110において、今回のエンジン始動時の燃料残量が増えていると判定された場合は、車体制御装置51は、硫黄分濃度測定処理が必要な場合であると判定し、燃料異常フラグFをOFFにリセットする。
次いで、車体制御装置51は硫黄分濃度測定処理を行う。この硫黄分濃度測定処理においては、まず、車体制御装置51は、硫黄分濃度測定処理のために予め設定した排気ガス中の硫黄分濃度の測定に適した所定の目標回転数Naの指令信号をエンジン制御装置52に出力する。この目標回転数Naの指令信号の出力は、エンジンコントロールダイヤル41からの目標回転数の指令信号に優先して行う。目標回転数Naは例えば中速回転数程度の回転数である。
次いで、車体制御装置51は、回転数検出装置43からの検出信号を入力し、車体制御装置51からの指令信号の目標回転数Naと回転数検出装置43により検出されるエンジン1の実回転数Nとを比較し、エンジン1の実回転数Nが目標回転数Na以下にあるかどうかを判定する。エンジン1の実回転数が目標回転数範囲Na以下にないと判定された場合は、ステップS140の手順を繰り返す。
また、車体制御装置51は、排気温度検出装置33からの検出信号を入力し、予め設定した排気ガス中の硫黄分濃度の測定に適した所定の温度範囲Texa~Texbと排気温度検出装置33により検出された排気ガスの温度Texとを比較し、排気ガスの温度Texが排気ガス中の硫黄分濃度の測定に適した所定の温度範囲Texa~Texbにあるかどうかを判定する。排気ガスの温度Texが所定の温度範囲Texa~Texbにないと判定された場合は、ステップS140及びS150の手順を繰り返す。
ステップS140において、エンジン1の実回転数が目標回転数範囲Na以下にあると判定され、ステップS150において、排気ガスの温度Texaが所定の温度範囲Texa~Texbにあると判定された場合は、車体制御装置51は、その後の経過時間Tと予め設定した目標時間Taとを比較し、経過時間Tが目標時間Taに達したかどうかを判定する。経過時間Tが目標時間Taに達していないと判定された場合は、ステップS140,S150及びS160の手順を繰り返す。
ステップS160において、経過時間Tが目標時間Taに達したと判定された場合は、車体制御装置51は、硫黄分濃度検出装置36からの検出信号を入力し、予め設定した排気ガス中の目標硫黄分濃度(閾値)と硫黄分濃度検出装置36により検出される排気ガス中の硫黄分濃度とを比較し、排気ガス中の硫黄分濃度が目標硫黄分濃度(閾値)以上であるかどうかを判定する。
ステップS170において、排気ガス中の硫黄分濃度が目標硫黄分濃度(閾値)以上であと判定された場合は、車体制御装置51は、燃料異常フラグFをONにセットする。
次いで、車体制御装置51は、警報表示装置42に作動信号を出力して、現在使用中の燃料は硫黄分濃度の高い燃料であることと、直ちに燃料を交換する必要があることを警報表示装置42に表示させる。
次いで、車体制御装置51は、エンジン1を停止させる準備として、上述した排気ガス中の硫黄分濃度の測定に適した目標回転数Naよりも低いエンジン停止に適した目標回転数Nbの指令信号をエンジン制御装置52に出力する。この目標回転数Nbの指令信号の出力も、エンジンコントロールダイヤル41による目標回転数の指示に優先して行う。目標回転数Nbは例えば低速アイドル回転数程度の回転数である。
次いで、ステップS200において、目標回転数Nbの指令信号をエンジン制御装置52に出力した後の経過時間Tと目標時間Tbとを比較し、経過時間Tが目標時間Tbに達したかどうかを判定する。
ステップS210において、経過時間Tが目標時間Tbに達したと判定された場合は、エンジン1の停止信号をエンジン制御装置52に出力し、エンジン1を自動停止させる。
ステップS110において、今回のエンジン始動時の燃料残量が増えていないと判定された場合は、車体制御装置51は硫黄分濃度測定処理が不要であると判定する。次いで車体制御装置51は燃料異常フラグFがOFFであるかどうかを判定し、燃料異常フラグFがOFFでない場合(ONである場合)は、一度、ステップS170において、排気ガス中の硫黄分濃度が目標硫黄分濃度(閾値)以上であと判定された後にキースイッチ46をオンしてエンジン1の始動をした場合であるので、ステップS190に進んで直ちに警告表示を行うとともに、ステップS200~S220に進んでエンジン停止のための目標回転数Nbの指令信号をエンジン制御装置52に出力し、目標時間Tb経過後、エンジン1を停止させる。
ステップS170において、排気ガス中の硫黄分濃度が目標硫黄分濃度(閾値)以上でないと判定された場合、或いはステップS230において、燃料異常フラグFがOFFであると判定された場合は、図4のステップS300に進む。このステップS300では、通常のエンジン回転数制御演算を行う。この通常のエンジン回転数制御演算では、エンジンコントロールダイヤル41からの指令信号を入力し、その指令信号に基づく目標回転数を演算し、その目標回転数の指令信号をエンジン制御装置52に出力する。この場合、車体制御装置51がオートアイドル制御等の付加的なエンジン制御機能を備えていてもよく、この場合は、エンジンコントロールダイヤル41からの指令信号に基づく目標回転数とそのエンジン制御機能に目標回転数の一方を指令信号としてエンジン制御装置52に出力する。
次いで、車体制御装置51はキースイッチ46の指令信号を入力し、キースイッチ46がOFFとなってエンジン1が停止されたかどうかを判定する。
ステップS320において、エンジン1が停止されたと判定された場合は、車体制御装置51は燃料油量検出装置40からの検出信号を入力し、燃料油量検出装置40により検出した燃料残量を記憶装置51aに記憶する。
~動作~
次に、以上のように構成した本実施の形態の動作を説明する。
まず、硫黄分濃度の低い通常燃料を給油した場合について説明する。
<硫黄分濃度の高い燃料を給油した場合>
次に、硫黄分濃度の高い燃料を給油した場合について説明する。
~効果~
以上のように構成した本実施の形態によれば、次の効果が得られる。
~バリエーション~
以上の実施の形態は本発明の精神の範囲内で種々の変更が可能である。
2 油圧システム
3 排気ガス後処理装置
4 エンジン制御システム
21 油圧ポンプ
22 パイロットポンプ
23 アクチュエータ群
24 コントロールバルブ装置
25 入力操作レバー装置
31 排気管(排気系統)
32a フィルタ
32b 酸化触媒
33 排気温度検出装置
34a,34b 排気圧力検出装置
36 硫黄分濃度検出装置
40 燃料油量検出装置
41 エンジンコントロールダイヤル
42 警報表示装置
43 回転数検出装置
45 電子ガバナ
46 キースイッチ
51 車体制御装置
51a 記憶装置
52 エンジン制御装置
100 下部走行体
101 上部旋回体
102 フロント作業機
103a,103b クローラ式走行装置
104a,104b 左右の走行モータ
105 旋回モータ
106 エンジンルーム
107 キャビン
111 ブーム
112 アーム
113 バケット
114 ブームシリンダ
115 アームシリンダ
116 バケットシリンダ
Claims (4)
- ディーゼルエンジン(1)と、このエンジンの排気系統に設けられた排気ガス後処理装置(3)と、前記エンジンによって駆動される油圧ポンプ(21)及びこの油圧ポンプから吐出される圧油により駆動される少なくとも1つの油圧アクチュエータ(23)を含む油圧システム(2)とを備えた油圧作業機械の排気ガス浄化システムにおいて、
前記エンジンの排気ガスの温度を検出する排気温度検出装置(33)と、
前記エンジンの排気ガス中の硫黄分濃度を検出する硫黄分濃度検出装置(36)と、
警報装置(42)と、
前記排気温度検出装置の検出値と前記硫黄分濃度検出装置の検出値に基づいて硫黄分濃度測定処理を行う制御装置(51,52)とを備え、
前記制御装置は、前記硫黄分濃度測定処理において、前記排気温度検出装置により検出した排気ガス温度が排気ガス中の硫黄分濃度の測定に適した所定の温度範囲にある場合に、前記硫黄分濃度検出装置を用いて前記エンジンの排気ガス中の硫黄分濃度を測定し、この硫黄分濃度が予め定めた閾値以上である場合に、前記警報装置を作動させることを特徴とする作業機械のエンジン制御システム。 - 請求項1記載の作業機械のエンジン制御システムにおいて、
前記エンジン(1)を始動させるキースイッチ(46)と、
前記エンジンに供給される燃料の残量を検出する燃料油量検出装置(40)とを更に備え、
前記制御装置(51,52)は、前記キースイッチがONするエンジン始動毎に、前回のエンジン停止時に記憶装置(51a)に記憶した燃料残量と今回のエンジン始動時に前記燃料油量検出装置が検出した燃料残量とを比較し、燃料残量が増えていた場合のみ、前記硫黄分濃度測定処理を行うことを特徴とする作業機械のエンジン制御システム。 - 請求項1又は2記載の作業機械のエンジン制御システムにおいて、
前記エンジン(1)の目標回転数を指示するエンジン回転数指示装置(41)を更に備え、
前記制御装置(51,52)は、前記硫黄分濃度測定処理を行わないときは、前記エンジン回転数指示装置が指示する目標回転数に基づいて前記エンジンの回転数を制御する通常エンジン回転数制御を行い、前記硫黄分濃度測定処理を行うときは、前記エンジン回転数指示装置による目標回転数の指示に係わらず、前記エンジンの回転数を強制的に前記排気ガス中の硫黄分濃度の測定に適した所定の目標回転数となるよう固定制御することを特徴とする作業機械のエンジン制御システム。 - 請求項1~3のいずれか1項記載の作業機械のエンジン制御システムにおいて、
前記制御装置(51,52)は、前記硫黄分濃度が予め定めた閾値以上である場合は、予め設定した所定の時間経過後に、前記エンジン(1)を自動停止させることを特徴とする作業機械のエンジン制御システム。
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2011
- 2011-08-08 JP JP2011173290A patent/JP2013036393A/ja active Pending
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2012
- 2012-05-15 US US14/125,108 patent/US20140116031A1/en not_active Abandoned
- 2012-05-15 KR KR1020147000399A patent/KR20140047068A/ko not_active Application Discontinuation
- 2012-05-15 WO PCT/JP2012/062417 patent/WO2013021703A1/ja active Application Filing
- 2012-05-15 EP EP12822316.1A patent/EP2743481A1/en not_active Withdrawn
- 2012-05-15 CN CN201280034100.5A patent/CN103703232A/zh active Pending
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JP2008144754A (ja) * | 2006-11-17 | 2008-06-26 | Honda Motor Co Ltd | 内燃機関の制御装置 |
JP2008255952A (ja) * | 2007-04-09 | 2008-10-23 | Toyota Motor Corp | 内燃機関の硫黄濃度検出装置 |
JP2010065425A (ja) | 2008-09-09 | 2010-03-25 | Sumitomo (Shi) Construction Machinery Co Ltd | 建設機械の燃料監視装置 |
JP2010180765A (ja) * | 2009-02-05 | 2010-08-19 | Mitsubishi Electric Corp | 内燃機関の制御装置 |
Cited By (8)
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CN104405485A (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 |
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 |
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 |
US9903833B2 (en) | 2013-08-23 | 2018-02-27 | Toyota Jidosha Kabushiki Kaisha | Control device and control method for internal combustion engine |
US9970371B2 (en) | 2013-08-23 | 2018-05-15 | Toyota Jidosha Kabushiki Kaisha | Control apparatus and control method for internal combustion engine |
US10551364B2 (en) | 2014-02-20 | 2020-02-04 | Toyota Jidosha Kabushiki Kaisha | Control system and control method for internal combustion engine |
Also Published As
Publication number | Publication date |
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US20140116031A1 (en) | 2014-05-01 |
CN103703232A (zh) | 2014-04-02 |
JP2013036393A (ja) | 2013-02-21 |
KR20140047068A (ko) | 2014-04-21 |
EP2743481A1 (en) | 2014-06-18 |
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