WO2011108444A1 - Dispositif de commande de moteur et procédé de commande de moteur pour véhicule de chantier - Google Patents

Dispositif de commande de moteur et procédé de commande de moteur pour véhicule de chantier Download PDF

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Publication number
WO2011108444A1
WO2011108444A1 PCT/JP2011/054198 JP2011054198W WO2011108444A1 WO 2011108444 A1 WO2011108444 A1 WO 2011108444A1 JP 2011054198 W JP2011054198 W JP 2011054198W WO 2011108444 A1 WO2011108444 A1 WO 2011108444A1
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WO
WIPO (PCT)
Prior art keywords
engine
engine speed
output torque
value
work vehicle
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PCT/JP2011/054198
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English (en)
Japanese (ja)
Inventor
芳明 齋藤
周 武田
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株式会社小松製作所
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Publication of WO2011108444A1 publication Critical patent/WO2011108444A1/fr

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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
    • F02D41/0205—Circuit arrangements for generating control signals using an auxiliary engine speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F02D2250/26—Control of the engine output torque by applying a torque limit
    • 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

Definitions

  • the present invention relates to an engine control device and an engine control method for a work vehicle.
  • Construction machines such as wheel loaders operate a work machine by rotating a variable displacement hydraulic pump connected to an output rotation shaft of an engine and driving a hydraulic actuator by pressure oil discharged from the hydraulic pump. .
  • the engine speed does not fluctuate greatly due to fluctuations in the work load so that the hydraulic actuator is stably driven regardless of the work load.
  • construction machinery employs an all-speed governor in which fluctuations in engine speed with respect to fluctuations in work load are small as an electronic governor that electrically controls the fuel injection amount of the engine.
  • FIG. 8 is a diagram showing the relationship between the engine speed and the engine output torque when the fuel injection amount of the engine is controlled by the all speed governor when the construction machine is running stably.
  • the stable running means that the construction machine is running in a state where the engine speed within a predetermined time is within a predetermined range.
  • symbol AL indicates an absorption torque curve of a traveling system for traveling a construction machine
  • symbol RL indicates a regulation line that determines the upper limit of the engine output corresponding to the accelerator pedal operation amount of the operator.
  • FIG. 9 is a diagram showing a change over time in the fuel injection amount when the fuel injection amount of the engine is controlled by the all speed governor when the construction machine is running stably.
  • the engine output is controlled so that the absorption torque absorbed by the traveling system matches the engine output.
  • the absorption torque absorbed by the traveling system changes as shown by a curve AL shown in FIG. 8 at a certain speed ratio of the torque converter.
  • the speed ratio is low during acceleration immediately after the construction machine starts, and is high during stable running.
  • a curve AL ′ in FIG. 8 indicates the absorption torque during acceleration, and is, for example, a speed ratio of 0.3.
  • a curve AL in FIG. 8 indicates the absorption torque during stable running, and is, for example, 0.8 in speed ratio. As the speed ratio increases, the curve AL ′ moves from the high torque side to the low torque side to become the curve AL.
  • the absorption torque absorbed by the traveling system is large during acceleration and gradually decreases.
  • the absorbed torque absorbed by the traveling system is substantially constant at a low value during stable traveling. For this reason, the engine speed at which the engine can output the absorption torque absorbed by the traveling system is constant on the regulation line RL.
  • the intersection of the absorption torque curve AL and the regulation line RL is called a matching point.
  • the engine speed is within a predetermined range ⁇ R centering on the engine speed R0 corresponding to the matching point M between the absorption torque curve AL and the regulation line RL of the traveling system.
  • the all speed governor increases or decreases the fuel injection amount with respect to the fuel injection amount F 0 corresponding to the engine speed R 0 , as shown in FIG. Let That is, when the load increases and the engine speed decreases, the all speed governor increases the fuel injection amount according to the regulation line RL so that an output that matches the decreased engine speed is generated.
  • the all speed governor decreases the fuel injection amount according to the regulation line RL. That is, in the all speed governor, even when the construction machine is running stably and the engine speed is not set to the target speed, the engine output torque along the regulation line RL as shown in FIG. Increase or decrease the engine output torque within the range of T max to T min .
  • the regulation line RL exists for each accelerator opening, a matching point also exists for each accelerator opening.
  • the present invention has been made in view of the above, and an object thereof is to provide an engine control device and an engine control method for a work vehicle that can reduce fuel consumption during stable running.
  • an engine control device for a work vehicle is an engine control device for a work vehicle that controls the fuel injection amount of the engine with an all-speed governor, and the engine speed is Based on the engine speed detected by the engine speed detecting means and the engine speed detected by the engine speed detecting means, it is determined whether or not the fluctuation of the engine speed within a predetermined time is within a predetermined range.
  • the determination means for determining that the work vehicle is in a stable running state and the determination means determine that the work vehicle is in a stable running state, and detecting the engine speed
  • the engine speed detected by the means is below a predetermined value, the engine fuel is limited so as to limit the engine output torque.
  • a control means for controlling the injection amount, the.
  • an engine control method for a work vehicle is an engine control method for a work vehicle that controls the fuel injection amount of the engine by an all-speed governor, the engine speed being Based on the detection step for detecting the engine speed and the engine speed detected in the detection step, it is determined whether or not the fluctuation of the engine speed within a predetermined time is within a predetermined range, and the engine speed within the predetermined time is determined.
  • a determination step for determining that the work vehicle is in a stable running state and a determination step determines that the work vehicle is in a stable running state, and the engine speed detected in the detection step is predetermined. If the value is less than the value, a control step for controlling the fuel injection amount of the engine so as to limit the engine output torque. And, including the.
  • the engine control device and the engine control method for a work vehicle since the output torque of the engine is limited at the time of stable traveling, it is possible to suppress wasteful consumption of fuel at the time of stable traveling, Fuel consumption can be reduced.
  • FIG. 1 is a schematic side view showing the overall configuration of a wheel loader according to an embodiment of the present invention.
  • FIG. 2 is a block diagram showing a configuration of an engine control device that controls the operation of the engine of the wheel loader shown in FIG.
  • FIG. 3 is a flowchart showing a flow of engine control processing by the engine control apparatus shown in FIG.
  • FIG. 4 is a diagram illustrating an example of an engine output torque limit line map.
  • FIG. 5 is a diagram for explaining the engine control process when the engine speed is within a predetermined range.
  • FIG. 6 is a diagram for explaining the engine control process when the engine speed is out of the predetermined range.
  • FIG. 7 is a diagram showing a change with time of the fuel injection amount by the engine control process shown in FIG. FIG.
  • FIG. 8 is a diagram showing the relationship between the engine speed and the output torque when the fuel injection amount of the engine is controlled by the all speed governor when the construction machine is running stably.
  • FIG. 9 is a diagram illustrating a change over time in the fuel injection amount when the fuel injection amount of the engine is controlled by the all speed governor when the construction machine is running stably.
  • FIG. 10 is a flowchart showing a modification of the engine control process shown in FIG.
  • FIG. 1 is a schematic side view showing the overall configuration of a wheel loader according to an embodiment of the present invention.
  • a wheel loader 1 according to an embodiment of the present invention includes a work machine 2, a frame unit 3, and a vehicle body 4.
  • the work machine 2 includes a lift arm 5.
  • the lift arm 5 is attached to the frame portion 3 with a base end portion freely swingable.
  • the frame portion 3 and the lift arm 5 are connected by a pair of lift cylinders 6.
  • the lift arm 5 swings as the lift cylinder 6 expands and contracts according to the operation of the work implement lever by the operator.
  • the bucket 7 is attached to the tip of the lift arm 5 and the bell crank (tilt lever) 8 is swingably attached to the substantially central part.
  • One end portion of the bell crank 8 and the frame portion 3 are connected by a tilt cylinder 9.
  • the other end of the bell crank 8 and the bucket 7 are connected by a tilt rod 10.
  • the bucket 7 swings as the tilt cylinder 9 expands and contracts according to the operation of the work implement lever by the operator.
  • the vehicle body 4 is equipped with a traveling device for traveling the wheel loader 1 and an engine 11 for supplying drive output to the traveling device.
  • the traveling device includes a PTO mechanism 12, a torque converter (T / C) 13, a transmission 14 that can be switched forward and backward and a plurality of shift speeds, a transfer 15, and a speed reducer 18 that drives a front wheel 16 and a rear wheel 17. Is provided.
  • the drive output of the engine 11 is transmitted to the transfer 15 via the PTO mechanism 12, the T / C 13, and the transmission 14 in order, and is transmitted to the speed reducer 18 on the front wheel 16 and rear wheel 17 side by the transfer 15.
  • the speed reducer 18 transmits the driving output of the engine 11 transmitted by the transfer 15 to the front wheels 16 and the rear wheels 17.
  • the vehicle body 4 is equipped with a variable displacement hydraulic pump 20 that supplies pressure oil to the lift cylinder 6 and the tilt cylinder 9 via a work machine control valve (not shown).
  • the hydraulic pump 20 is connected to the engine 11 via the PTO mechanism 12 and is driven using a part of the drive output of the engine 11.
  • the pump capacity of the hydraulic pump 20 is variably controlled by changing the inclination angle of the swash plate of the hydraulic pump 20 by a controller (not shown).
  • a driver's cab 21 is provided in the upper part of the vehicle body 4.
  • a driving operation device 22 including a transmission shift lever, an accelerator pedal, a brake pedal, and a work implement lever for operating the work implement 2 operated by the driver is provided in the cab 21.
  • the driver can operate the driving operation device 22 to perform forward / reverse switching of the wheel loader 1, adjustment of traveling speed (acceleration and deceleration), and operation of the work machine 2.
  • FIG. 2 is a block diagram showing a configuration of an engine control device that controls the operation of the engine 11 of the wheel loader 1 shown in FIG.
  • the engine control apparatus 100 includes an engine speed sensor 101, an engine output torque sensor 102, a speed stage sensor 103, a work implement lever sensor 104, an accelerator pedal sensor 105, a transmission controller 106, an engine controller 107, and A work machine controller 111 is provided.
  • the engine rotation speed sensor 101 is attached to the output rotation shaft of the engine 11 and detects the rotation speed of the engine 11.
  • the engine speed sensor 101 inputs an electric signal indicating the speed of the engine 11 to the transmission controller 106.
  • the engine speed sensor 101 functions as engine speed detection means according to the present invention.
  • the engine output torque sensor 102 is attached to the output rotation shaft of the engine 11 and detects the output torque of the engine 11.
  • the engine output torque sensor 102 inputs an electric signal indicating the output torque of the engine 11 to the transmission controller 106.
  • the speed stage sensor 103 detects the position of the speed stage lever 108 for switching the speed stage of the wheel loader 1 and inputs an electric signal indicating the detected position to the transmission controller 106.
  • the work implement lever sensor 104 detects an operation amount of the work implement lever 109 for operating the lift cylinder 6 and the tilt cylinder 9 and inputs an electric signal indicating the detected operation amount to the work implement controller 111.
  • the work machine controller 111 controls the transmission controller 106 and the engine controller 107 based on the electrical signal input from the work machine lever sensor 104.
  • the accelerator pedal sensor 105 detects an operation amount of the accelerator pedal 110 and inputs an electric signal indicating the detected operation amount to the transmission controller 106.
  • the transmission controller 106 is realized by a microcomputer including a CPU, a RAM, a ROM, an input / output circuit, and the like.
  • a control program and an engine output torque limit line map indicating the relationship between the engine speed and the engine output torque limit value are stored in advance. Details of the engine output torque limit line map will be described later.
  • the CPU in the transmission controller 106 loads the control program into the RAM, and executes the control program loaded into the RAM, whereby the engine speed sensor 101, the engine output torque sensor 102, the speed stage sensor 103, the accelerator pedal.
  • a control signal for controlling the operation of the engine 11 is output to the engine controller 107 in accordance with an electrical signal input from the sensor 105 and the work machine controller 111.
  • the transmission controller 106 functions as determination means and control means according to the present invention.
  • the engine controller 107 is realized by a microcomputer including a CPU, a RAM, a ROM, an input / output circuit, and the like.
  • a control program is stored in advance in the engine controller 107.
  • the CPU in the engine controller 107 loads the control program into the RAM, and executes the control program loaded into the RAM, so that the engine 11 operates in accordance with control signals input from the transmission controller 106 and the work machine controller 111. Control the behavior. Specifically, the CPU in the engine controller 107 controls the operation of the all speed governor 11 a that controls the fuel injection amount of the engine 11 in accordance with a control signal input from the transmission controller 106.
  • the transmission controller 106 and the engine controller 107 are configured separately, but the transmission controller 106 and the engine controller 107 may be configured integrally.
  • the control program and engine output torque limit line map stored in the transmission controller 106 and engine controller 107 are files in an installable or executable format, such as CD-ROM, flexible disk, CD-R, DVD, etc. It may be configured to be recorded and provided on a computer-readable recording medium.
  • the control program and the engine output torque limit line map may be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. Further, the control program and the engine output torque limit line map may be provided or distributed through a telecommunication line such as the Internet.
  • the controller to which electrical signals from various sensors are input is an example, and the electrical signals from various sensors may be input to controllers other than those described above.
  • the engine output torque is detected by the engine output torque sensor 102.
  • the engine output torque may be obtained by calculation from the engine speed, the fuel injection amount, the atmospheric pressure, or the like.
  • FIG. 3 is a flowchart showing the flow of engine control processing by the engine control apparatus 100.
  • the engine control process by the engine control device 100 starts at the timing when the ignition switch of the wheel loader 1 is switched from the off state to the on state, and proceeds to the process of step S1.
  • step S1 the transmission controller 106 detects the engine speed and the engine output torque using the engine speed sensor 101 and the engine output torque sensor 102, and detects them within a predetermined time (for example, 5 seconds). The stored engine speed and engine output torque are temporarily stored. Thereby, the process of step S1 is completed and the engine control process proceeds to the process of step S2.
  • the transmission controller 106 determines whether or not the wheel loader 1 is in a stable travel state based on the engine speed stored in the process of step S1. Specifically, the transmission controller 106 determines whether or not the fluctuation of the engine speed within a predetermined time is within a predetermined range. Note that the value of the predetermined time is about 5 [sec] in order to reliably detect that the wheel loader 1 is in a stable running state and suppress occurrence of hunting in which engine control is frequently switched. It is desirable to set.
  • the value in the predetermined range is a value set in advance in consideration of the fluctuation value of the engine speed that may be caused by the fluctuation of the traveling load when the wheel loader 1 is traveling on the road surface. That is, the engine speed varies due to some unevenness on the road surface. Therefore, it is desirable that the value in the predetermined range is a value that does not cause frequent switching of engine control even under the influence of road surface unevenness. Specifically, the value in the predetermined range is a value of about 10 [rpm].
  • the transmission controller 106 determines that the wheel loader 1 is in a stable running state, and advances the engine control process to the process of step S3.
  • the transmission controller 106 determines that the wheel loader 1 is not in a stable running state, and returns the engine control process to the process of step S1.
  • step S3 the transmission controller 106 stores the maximum value N_eng_max and the minimum value N_eng_min of the engine speed among the engine speeds stored in the process of step S1 in the storage unit 106a. Thereby, the process of step S3 is completed and the engine control process proceeds to the process of step S4.
  • step S4 the transmission controller 106 calculates the average value N_eng_ave of the engine speed and the average value T_eng_ave of the engine output torque within the predetermined time stored by the process of step S1, and the calculated engine speed.
  • the average value N_eng_ave and the average value T_eng_ave of the engine output torque are stored in the storage unit 106a.
  • step S5 the transmission controller 106 detects the engine speed using the engine speed sensor 101, and the detected engine speed is an average value N_eng_ave of the engine speeds calculated by the process of step S4. It is determined whether or not: As a result of the determination, if the engine speed is equal to or lower than the average engine speed N_eng_ave, the transmission controller 106 advances the engine control process to the process of step S6. On the other hand, when the engine speed is larger than the average engine speed N_eng_ave, the transmission controller 106 advances the engine control process to step S7.
  • the transmission controller 106 detects the engine speed detected by the process of step S5 based on the average value N_eng_ave of the engine speed calculated by the process of step S4 and the average value T_eng_ave of the engine output torque.
  • the engine output torque limit value corresponding to is calculated, and the calculated engine output torque limit value is output to the engine controller 107 as an engine output torque command value.
  • the engine controller 107 controls the all speed governor 11a according to the engine output torque command value, and the all speed governor 11a controls the fuel injection amount of the engine 11 so as to output the engine output torque corresponding to the engine output torque limit value.
  • FIG. 4 is a diagram illustrating an example of an engine output torque limit line map stored in advance in the storage unit 106 a of the transmission controller 106.
  • the engine output torque limit line map shows engine output torque limit lines LL1 to LL1 indicating the relationship between the engine speed and the engine output torque for each of a plurality of engine output torque ratios, with the maximum output torque being 100%. It is configured by LL6.
  • the value of the engine output torque ratio shown in FIG. 4 does not indicate a strict ratio with respect to the maximum output torque. That is, the value of the engine output torque ratio is quantified for convenience in order to reduce the engine output torque to some extent, that is, to limit the fuel injection amount.
  • the transmission controller 106 controls the output torque of the engine 11 according to the engine output torque limit line LL2. That is, the transmission controller 106 controls the fuel injection amount so as not to exceed the engine output torque limit line LL2.
  • the transmission controller 106 outputs the output torque of the engine 11 according to the engine output torque limit line LL6.
  • a curve RL1 indicates a regulation line when the throttle opening is 0 [%].
  • an engine output torque limit line corresponding to an unspecified engine output torque ratio between engine output torque ratios defined in the engine output torque limit line map shown in FIG. 4 is obtained by interpolation processing. Specifically, when obtaining an engine output torque limit line having an engine output torque ratio of 50%, the transmission controller 106 sets the engine output torque limit line LL3 corresponding to the engine output torque ratio 40% and the engine output torque ratio 60%. An engine output torque limit line having an engine output torque ratio of 50% is obtained by interpolation using the corresponding engine output torque limit line LL4. Further, the engine output torque limit line may be horizontal without an inclination as shown in FIG. That is, the engine output torque limit line only needs to be configured to suppress a rapid decrease in the engine speed due to an increase in load, and may be a curved line instead of a straight line as shown in FIG.
  • the transmission controller 106 calculates an engine output torque limit line LL that passes through the coordinate values (N_eng_ave, T_eng_ave) from the engine output torque limit line map. Then, the transmission controller 106 specifies the position on the engine output torque limit line LL corresponding to the engine speed detected by the process of step S5, and calculates the engine output torque at the specified position as the engine output torque limit value. . As a result, the output torque of the engine 11 is controlled according to the engine output torque limit line LL.
  • step S7 the transmission controller 106 uses the engine speed sensor 101 to detect the engine speed, and determines whether or not the detected engine speed is outside a predetermined range. Specifically, the transmission controller 106 stores the detected engine speed equal to or greater than a value obtained by adding a predetermined value to the maximum engine speed N_eng_max stored in the process of step S4, or stored in the process of step S4. It is determined whether or not the value is equal to or less than a value obtained by subtracting a predetermined value from the minimum value N_eng_min of the engine 11 rotation speed. The predetermined value added or subtracted here corresponds to the second predetermined value according to the present invention.
  • the value added or subtracted to the maximum value N_eng_max and the minimum value N_eng_min of the engine 11 takes into account the fluctuation value of the engine 11 that may occur when the wheel loader 1 is traveling on the road surface. It is a preset value, for example, a value of about 10 rpm. This is in order to avoid frequent hunting of the control by deviating from the control of the present invention as soon as the stored maximum value N_eng_max or minimum value N_eng_min of the engine speed is exceeded.
  • the transmission controller 106 advances the engine control process to the process of step S8.
  • the transmission controller 106 returns the engine control process to the process of step S5.
  • step S8 the transmission controller 106 determines that the engine speed maximum value N_eng_max and the minimum value N_eng_min, the engine speed average value N_eng_ave, and the engine output torque average value stored by the processes of step S3 and step S4.
  • the data T_eng_ave is deleted from the storage unit 106a.
  • step S9 the output torque restriction by the output torque restriction line LL is released.
  • FIG. 5 is a diagram for explaining the engine control process when the engine speed is within the predetermined range
  • FIG. 6 is a diagram for explaining the engine control process when the engine speed is outside the predetermined range
  • FIG. 7 is a diagram showing a change with time of the fuel injection amount by the engine control process shown in FIG.
  • the transmission controller 106 limits the output torque of the engine 11 along the engine output torque limit line LL as shown by the arrow B, and suppresses unnecessary fuel injection.
  • the transmission controller 106 sets the regulation line RL as indicated by an arrow A so that unnecessary fuel injection is not performed. Along with this, the output torque of the engine 11 is controlled.
  • the transmission controller 106 controls the fuel injection amount along the regulation line RL.
  • R max indicates a value obtained by adding a predetermined value to the maximum engine speed N_eng_max stored in step S4
  • R min indicates the minimum engine speed N_eng_min stored in step S4. Indicates a value obtained by subtracting a predetermined value from. Note that the value of R max may coincide with the maximum value N_eng_max.
  • the transmission controller 106 limits the output torque of the engine 11 when the rotational speed of the engine 11 fluctuates within a minute range while the wheel loader 1 is traveling stably.
  • the fuel injection amount that is equal to or greater than the fuel injection amount F 0 required to output the engine output torque necessary for stable running is limited.
  • the fuel injection amount by the conventional engine control process shown in FIG. 9 it is possible to suppress unnecessary fuel injection during stable running and improve fuel efficiency during stable running.
  • the transmission controller 106 determines whether or not the wheel loader 1 is in a stable running state based on the engine speed, so that the wheel loader 1 is stable. It is not necessary for the operator to perform setting operation to be in the running state, and the operator's labor can be reduced.
  • the engine output torque is limited when the engine speed is equal to or lower than the average engine speed N_eng_ave.
  • the engine output torque may be limited when the engine speed is equal to or lower than the engine speed (steps S15 and S16).
  • a matching point exists for each accelerator opening. The engine speed of the matching point can be obtained by referring to the map or by calculating.
  • the running torque based on the speed stage is stored, and the engine speed of the matching point can be calculated for each accelerator opening.
  • the traveling torque can be calculated from the actual load state, road surface state, and operating state of the traveling device, and the engine speed at the matching point can be calculated for each accelerator opening.
  • the transmission controller 106 limits the output torque of the engine 11 based on the average value T_eng_ave of the engine output torque.
  • the present invention is not limited to this embodiment.
  • the engine output torque The output torque of the engine 11 may be limited based on a value equal to or less than the average value T_eng_ave.
  • the fuel efficiency during stable running can be further reduced, but the engine speed is drastically decreased.
  • the engine operating state may become unstable. Therefore, it is desirable to limit the output torque of the engine 11 based on the most probable average value T_eng_ave as the output required during stable running.
  • other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.
  • the construction machine has been described as an example.
  • the present invention can be applied to general work vehicles including industrial vehicles such as forklifts and agricultural machinery such as tractors that control the fuel injection amount of the engine by an all-speed governor. it can.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

Si le régime d'un moteur se trouve dans la plage allant de Rmin à Rmax et tombe sous la valeur moyenne pour le régime du moteur pendant une période prédéfinie, un contrôleur de transmission limite la couple de sortie du moteur en conformité avec une courbe de limite du couple de sortie (LL) et supprime l'injection de carburant inutile. Par conséquent, le couple de sortie du moteur est limité lorsqu'il se déplace de manière stable, limitant ainsi la consommation inutile de carburant et améliorant le rendement du carburant.
PCT/JP2011/054198 2010-03-01 2011-02-24 Dispositif de commande de moteur et procédé de commande de moteur pour véhicule de chantier WO2011108444A1 (fr)

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JP2010044640 2010-03-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2585901A (en) * 2019-07-22 2021-01-27 Caterpillar Inc Method of reducing fuel consumption in loaders, excavators, backhoe loaders and the like
CN112282944A (zh) * 2019-07-22 2021-01-29 卡特彼勒公司 减少装载机、挖掘机、反铲装载机等中的燃料消耗的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11223142A (ja) * 1998-02-04 1999-08-17 Mazda Motor Corp エンジンの制御装置
JP2004150306A (ja) * 2002-10-29 2004-05-27 Komatsu Ltd エンジンの制御装置
WO2005014990A1 (fr) * 2003-08-11 2005-02-17 Komatsu Ltd. Dispositif de commande d'entrainement hydraulique et pelle hydraulique comportant le dispositif de commande
JP2005163605A (ja) * 2003-12-02 2005-06-23 Komatsu Ltd ハイブリッド作業機械の駆動制御装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11223142A (ja) * 1998-02-04 1999-08-17 Mazda Motor Corp エンジンの制御装置
JP2004150306A (ja) * 2002-10-29 2004-05-27 Komatsu Ltd エンジンの制御装置
WO2005014990A1 (fr) * 2003-08-11 2005-02-17 Komatsu Ltd. Dispositif de commande d'entrainement hydraulique et pelle hydraulique comportant le dispositif de commande
JP2005163605A (ja) * 2003-12-02 2005-06-23 Komatsu Ltd ハイブリッド作業機械の駆動制御装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2585901A (en) * 2019-07-22 2021-01-27 Caterpillar Inc Method of reducing fuel consumption in loaders, excavators, backhoe loaders and the like
CN112282944A (zh) * 2019-07-22 2021-01-29 卡特彼勒公司 减少装载机、挖掘机、反铲装载机等中的燃料消耗的方法

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