WO2014192340A1 - 建設機械 - Google Patents
建設機械 Download PDFInfo
- Publication number
- WO2014192340A1 WO2014192340A1 PCT/JP2014/054453 JP2014054453W WO2014192340A1 WO 2014192340 A1 WO2014192340 A1 WO 2014192340A1 JP 2014054453 W JP2014054453 W JP 2014054453W WO 2014192340 A1 WO2014192340 A1 WO 2014192340A1
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- WO
- WIPO (PCT)
- Prior art keywords
- engine
- low idle
- ecu
- construction machine
- output torque
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2246—Control of prime movers, e.g. depending on the hydraulic load of work tools
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- 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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/08—Introducing corrections for particular operating conditions for idling
- F02D41/083—Introducing corrections for particular operating conditions for idling taking into account engine load variation, e.g. air-conditionning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
- F02D2200/1004—Estimation of the output torque
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
- F02D2200/703—Atmospheric pressure
Definitions
- the present invention relates to a construction machine.
- the construction machine includes a hydraulic pump torque control device that prevents engine stall by reducing the absorption torque of the hydraulic pump in response to a decrease in engine output. For example, it is like patent document 1.
- Patent Document 1 reduces the engine load by controlling the absorption torque of the hydraulic pump. Therefore, when the construction machine is used at high altitude where atmospheric pressure is low, or when the fuel injection amount of the engine is suppressed in order to comply with exhaust gas regulations at high altitude in recent years, the output torque of the engine exceeds the reduction amount of the absorption torque of the hydraulic pump. There was a possibility that engine stall occurred. Further, there has been a problem that the engine speed is increased more than necessary to prevent engine stall and fuel is consumed wastefully.
- An object of the present invention is to provide a construction machine capable of preventing engine stall with an appropriate fuel injection amount and suppressing wasteful fuel consumption.
- a construction machine in which a hydraulic pump is driven by power from an engine, the engine output torque characteristic is set based on the atmospheric pressure detected by the atmospheric pressure detecting means, and the engine at low idle speed The low idle rotational speed is set so that the maximum torque of the engine becomes larger than the maximum absorption torque of the hydraulic pump.
- the output torque characteristic is further set based on the intake air temperature detected by the intake air temperature detection means and the fuel temperature detected by the fuel temperature detection means.
- the switching means is configured to be able to select whether or not to set the low idle speed based on the output torque characteristic and the maximum absorption torque.
- the low idle rotation speed based on the output torque characteristic and the maximum absorption torque is not set.
- the low idle rotation speed based on the output torque characteristic and the maximum absorption torque is not set.
- the low idle rotation speed is set according to the working state. Therefore, engine stall can be prevented with an appropriate fuel injection amount, and wasteful fuel consumption can be suppressed.
- the low idle rotation speed is set more finely according to the environment. Therefore, engine stall can be prevented with an appropriate fuel injection amount, and wasteful fuel consumption can be suppressed.
- the low idle rotation speed desired by the operator can be switched according to the working state. Thereby, useless fuel consumption can be suppressed without lowering the working efficiency.
- the low idle rotation speed is set according to the working state. Therefore, engine stall can be prevented with an appropriate fuel injection amount, and wasteful fuel consumption can be suppressed.
- the left view which shows the whole structure of the construction machine which concerns on one Embodiment of this invention.
- the block diagram which shows the hydraulic circuit of the construction machine which concerns on one Embodiment of this invention.
- (A) The figure which shows the graph which showed the relationship between the output torque characteristic of an engine, and the low idle rotation speed
- (b) The figure which shows the graph which showed the relationship between each low idle rotation speed.
- the backhoe 1 which is one embodiment of the construction machine of the present invention will be described with reference to FIG.
- the direction of the arrow F is defined as the front direction of the backhoe 1
- the direction of the arrow U is defined as the upward direction of the backhoe 1
- the front, rear, left, right, up and down directions are defined.
- the backhoe 1 is described as an embodiment of the construction machine, but the construction machine is not limited to this.
- the backhoe 1 mainly includes a traveling device 2, a turning device 3, and a work device 4.
- the traveling device 2 mainly includes a pair of left and right crawlers 5, 5, a left traveling hydraulic motor 5L, and a right traveling hydraulic motor 5R.
- the traveling device 2 can drive the backhoe 1 forward and backward by driving the crawler 5 on the left side of the machine body by the left traveling hydraulic motor 5L and the crawler 5 on the right side of the machine body by the right traveling hydraulic motor 5R. .
- the turning device 3 mainly includes a turntable 6, a turning motor 7, a control unit 8, an engine 9, and the like.
- the swivel base 6 is a main structure of the swivel device 3.
- the swivel base 6 is disposed above the travel device 2 and is supported by the travel device 2 so as to be capable of swiveling.
- the turning device 3 can turn the turntable 6 with respect to the traveling device 2 by driving the turning motor 7.
- the swivel base 6 is provided with a working device 4, a control unit 8, and an engine 9 serving as a power source.
- the steering unit 8 includes various operation tools and is configured to be able to operate the backhoe 1.
- the control unit 8 is provided at the left front portion of the swivel base 6.
- the cockpit 11 is arrange
- the operation lever device 26 is configured to be able to operate the work device 4 and the swivel base 6.
- the steering unit 8 includes an accelerator 27 that changes the throttle opening of the engine 9 and a changeover switch 28 that is a switching means (see FIG. 2).
- the operator can change the output of the engine 9 (the number of revolutions of the engine 9) by operating the accelerator 27.
- the changeover switch 28 selectively selects whether to enable low-idle control, which will be described later, whether to enable auto-decel control, or whether to enable low-idle control and auto-decel control. Is. The operator can select whether to enable low idle control and auto-decel control, which will be described later, by operating the changeover switch 28.
- the working device 4 mainly includes a boom 12, an arm 13, a bucket 14 which is a kind of attachment, a boom cylinder 15, an arm cylinder 16, and an attachment cylinder 17.
- the boom 12 is rotatably supported at one end by a substantially central front end of the swivel base 6.
- the boom 12 is rotated about one end as a center of rotation by a boom cylinder 15 that is driven to extend and retract.
- One end of the arm 13 is rotatably supported by the other end of the boom 12.
- the arm 13 is rotated about one end portion as a rotation center by an arm cylinder 16 which is driven to extend and retract.
- One end of the bucket 14 which is a kind of attachment is rotatably supported by the other end of the arm 13.
- the bucket 14 is rotated around one end by a cylinder for attachment 17 that is driven to extend and contract.
- the working device 4 has a multi-joint structure that performs excavation of earth and sand using the bucket 14.
- the working device 4 is provided with a hydraulic pipe (not shown) for supplying hydraulic oil to the boom cylinder 15, the arm cylinder 16, and the attachment cylinder 17.
- the backhoe 1 according to the present embodiment is the working device 4 that has the bucket 14 and performs excavation work, but is not limited thereto.
- the crushing work has a hydraulic breaker instead of the bucket 14.
- the working device 4 that performs the above may be used.
- the hydraulic circuit 18 includes a direction switching valve 19 for a swing motor, a direction switching valve 20 for a boom cylinder, a direction switching valve 21 for an arm cylinder, a direction switching valve 22 for an attachment, and a direction switching valve 23 for a traveling motor.
- a hydraulic pump 24 and a control device 25 are examples of a hydraulic pump 24 and a control device 25.
- the direction switch valve 19 for the swing motor, the direction switch valve 20 for the boom cylinder, the direction switch valve 21 for the arm cylinder and the direction switch valve 22 for the attachment are slid by the pilot pressure so that the swing motor 7 and the boom cylinder 15 , A pilot-type direction switching valve that switches the flow of hydraulic oil supplied to the arm cylinder 16 and the attachment cylinder 17.
- the direction switching valve 19 for the turning motor switches the direction of the hydraulic oil supplied to the turning motor 7.
- the turning motor direction switching valve 19 is in one position, the turning motor 7 is rotationally driven in one direction by the hydraulic oil.
- the direction switching valve 19 for the turning motor is in another position, the turning motor 7 is rotationally driven in the other direction by the hydraulic oil.
- the boom cylinder direction switching valve 20 switches the direction of the hydraulic oil supplied to the boom cylinder 15.
- the boom cylinder 15 expands and contracts by the action of the boom cylinder direction switching valve 20, and the boom 10 is rotated upward or downward.
- the arm cylinder direction switching valve 21 switches the direction of hydraulic oil supplied to the arm cylinder 16.
- the arm cylinder 16 expands and contracts by the action of the arm cylinder direction switching valve 21, and the arm 13 is rotated to the cloud side or the dump side.
- the traveling motor direction switching valve 23 switches the direction of hydraulic oil supplied to the left traveling hydraulic motor 5L and the right traveling hydraulic motor 5R (hereinafter simply referred to as “traveling motors 5L and 5R”).
- traveling motors 5L and 5R are rotationally driven in one direction by hydraulic oil.
- travel motor direction switching valve 23 is in another position, the travel motors 5L and 5R are rotationally driven in the other direction by the hydraulic oil.
- the attachment direction switching valve 22 switches the direction of the hydraulic oil supplied to the attachment cylinder 17.
- the attachment cylinder 17 expands and contracts by the action of the attachment direction switching valve 22, and the bucket 14 is rotated to the cloud side or the dump side.
- the direction switching valve 19 for the swing motor, the direction switching valve 20 for the boom cylinder, the direction switching valve 21 for the arm cylinder, the direction switching valve 22 for attachment, and the direction switching valve 23 for the traveling motor are pilots based on the operation of the operation lever device 26.
- the direction of the hydraulic fluid supplied to each direction switching valve can be switched by pressure.
- the hydraulic pump 24 is driven by the engine 9 and discharges hydraulic oil.
- the hydraulic pump 24 is a variable displacement pump that can change the discharge amount by changing the swash plate angle of a movable swash plate (not shown).
- the hydraulic oil discharged from the hydraulic pump 24 is supplied to each direction switching valve.
- control device 25 and the ECU 29 included in the backhoe 1 according to the present invention will be described.
- the control device 25 transmits a control signal to the ECU 29.
- the control device 25 may actually be configured such that a CPU, ROM, RAM, HDD, or the like is connected by a bus, or may be configured by a one-chip LSI or the like.
- the control device 25 stores various programs for controlling the ECU 29.
- the control device 25 is connected to the operation lever device 26 and can acquire an operation signal from the operation lever device 26.
- the control device 25 is connected to the accelerator 27 and can acquire an operation signal from the accelerator 27.
- the control device 25 is connected to the changeover switch 28 and can obtain an operation signal from the changeover switch 28 (an operation signal indicating whether to perform low idle control and / or auto-decel control).
- the ECU 29 controls the engine 9 and the like.
- the ECU 29 may actually be configured such that a CPU, ROM, RAM, HDD, or the like is connected by a bus, or may be configured by a one-chip LSI or the like.
- the ECU 29 stores various programs for controlling the engine 9 and the like.
- the ECU 29 calculates the output torque characteristic map M1 for calculating the output torque characteristic Tp (Tp0 ⁇ Tp1 ⁇ ) of the engine 9 from the atmospheric pressure P (atmospheric pressure P0 ⁇ P1 ⁇ ) in order to satisfy the exhaust gas regulation value.
- a low idle rotational speed map M2 for calculating the low idle rotational speed Vlb of the engine 9 from the output torque characteristic Tp of the engine 9 is stored.
- the output torque characteristic Tp is an output possible range at each engine speed (hereinafter, simply referred to as “speed”) in a state where the engine 9 satisfies the exhaust gas regulation value under the atmospheric pressure P. That is, the maximum output torque at each rotational speed is shown.
- the rotation speed Vla indicates the rotation speed calculated based on the operation of the accelerator 27.
- the rotation speed Vlb indicates the rotation speed calculated so that the maximum output torque of the engine 9 at the rotation speed is larger than the maximum absorption torque Th of the hydraulic pump 24 based on the output torque characteristic Tp of the engine 9.
- the rotation speed Vlc indicates the original low idle rotation speed of the engine 9.
- an output torque characteristic Tp1 indicating the maximum output torque of the engine 9 at each rotation speed is calculated from the output torque characteristic map M1 based on the atmospheric pressure P1 (see FIG. 3A). Further, based on the calculated output torque characteristic Tp1, the rotational speed Vlb is calculated from the low idle rotational speed map M2 so that the maximum output torque Tb1 of the rotational speed Vlb is larger than the maximum absorption torque Th of the hydraulic pump 24. Is possible (see FIG. 3A).
- setting the calculated rotational speed Vlb to the low idle rotational speed of the engine 9 is referred to as low idle control. Further, when the operation by the hydraulic device is not performed, setting the rotation speed Vlc to the low idle rotation speed of the engine 9 is referred to as auto-decel control.
- the ECU 29 is connected to various sensors and fuel injection devices (not shown) provided in the engine 9, and can control the injection amount of fuel injected by the fuel injection device.
- the ECU 29 is connected to the atmospheric pressure sensor 30 and can acquire the atmospheric pressure P detected by the atmospheric pressure sensor 30.
- the ECU 29 is connected to the fuel temperature sensor 31 and can obtain a fuel temperature Tf in a fuel injection pump (not shown) detected by the fuel temperature sensor 31.
- the ECU 29 is connected to the intake air temperature sensor 32, and can acquire the intake air temperature Ti of the engine 9 detected by the intake air temperature sensor 32.
- the ECU 29 can calculate the output torque characteristic Tp of the engine 9 from the output torque characteristic map M1 based on the acquired atmospheric pressure P.
- the ECU 29 can calculate the rotational speed Vlb of the engine 9 from the low idle rotational speed map M2 based on the calculated output torque characteristic Tp of the engine 9.
- the ECU 29 is connected to the control device 25, and the operation lever device 26 acquired by the control device 25, the operation signal from the accelerator 27 and the changeover switch 28, the operation signal whether or not to perform low idle control, and whether to perform auto-decel control. It is possible to acquire an operation signal indicating whether or not.
- the engine 9 is subjected to isochronous control that maintains a constant engine speed against load fluctuations by the ECU 29.
- the engine 9 of the backhoe 1 is set by the ECU 29 to the output torque characteristic Tp0 when the atmospheric pressure P0, and to the output torque characteristic Tp1 when the atmospheric pressure P1.
- the engine 9 is controlled so as to be able to output up to the maximum output torque Tc0 at the rotational speed Vlc that is the low idle rotational speed when the atmospheric pressure P0, and at the rotational speed Vlc that is the low idle rotational speed at the atmospheric pressure P1.
- the output torque is controlled to be output up to Tc1. Therefore, the engine 9 has the maximum output torque Tc1 at the rotation speed Vlc smaller than the maximum absorption torque Th of the hydraulic pump 24 due to the output torque characteristics.
- the ECU 29 when the ECU 29 has not acquired a control signal for enabling the low idle control from the control device 25, the ECU 29 sets the rotation speed Vla based on the operation amount of the accelerator 27. Set to.
- the ECU 29 obtains a control signal for enabling the low idle control from the control device 25, the ECU 29 sets the low idle rotational speed of the engine 9 to the rotational speed Vlb.
- the ECU 29 acquires a control signal for enabling the auto-decel control
- the ECU 29 sets the low idle rotation speed of the engine 9 to the low idle rotation speed Vlc until an operation signal for the operation lever device 26 is acquired from the control device 25.
- control mode for setting the low idle speed of the engine 9 in the ECU 29 will be specifically described.
- step S110 the ECU 29 acquires the atmospheric pressure P1 detected by the atmospheric pressure sensor 30, and shifts the step to step S120. Further, the ECU 29 can further acquire a fuel temperature Tf1 in a fuel tank (not shown) detected by the fuel temperature sensor 31 and an intake air temperature Ti1 of the engine 9 detected by the intake air temperature sensor 32.
- step S120 the ECU 29 acquires an operation signal from the accelerator 27, calculates the rotation speed Vla based on the operation amount of the accelerator 27, and shifts the step to step S120.
- step S130 the ECU 29 calculates an output torque characteristic Tp1 from the output torque characteristic map M1 based on the acquired atmospheric pressure P1, and sets the calculated output torque characteristic Tp1 as an engine output torque characteristic at the atmospheric pressure P1, To step S140.
- the ECU 29 can further calculate the output torque characteristic Tp1 from the output torque characteristic map M1 based on the acquired fuel temperature Tf1 and intake air temperature Ti1.
- step S140 the ECU 29 calculates the rotational speed Vlb from the low idle rotational speed map M2 based on the set output torque characteristic Tp1, and causes the process to proceed to step S150.
- step S150 the ECU 29 determines whether or not the calculated rotation speed Vlb is greater than the calculated rotation speed Vla. As a result, when it is determined that the rotation speed Vlb is larger than the rotation speed Vla, the ECU 29 shifts the step to step S160 (see FIG. 3B). On the other hand, when it is determined that the rotation speed Vlb is not greater than the rotation speed Vla, the ECU 29 shifts the step to step S260.
- step S160 the ECU 29 acquires the operation signal of the changeover switch 28 from the control device 25, and determines whether or not the low idle control is valid based on the acquired operation signal. As a result, when it is determined that the low idle control is effective, the ECU 29 shifts the step to step S170. On the other hand, when determining that the low idle control is not effective, the ECU 29 shifts the step to step S370.
- step S170 the ECU 29 starts the low idle control A and shifts the step to step S171 (see FIG. 5).
- step S171 the low idle control A ends, the ECU 29 returns the step to step S110.
- step S260 the ECU 29 acquires the operation signal of the changeover switch 28 from the control device 25, and determines whether or not the auto-decel control is valid based on the acquired operation signal. As a result, when it is determined that the auto-decel control is effective, the ECU 29 shifts the step to step S270. On the other hand, when it is determined that the auto-decel control is not effective, the ECU 29 shifts the step to step S370.
- step S270 the ECU 29 starts the auto-decel control B and shifts the step to step S271 (see FIG. 6).
- step S271 see FIG. 6
- ECU 29 returns the step to step S110.
- step S370 the ECU 29 sets the low idle rotation speed to the rotation speed Vlb, and returns the step to step S110.
- step S171 of the low idle control A the ECU 29 acquires the operation signal of the changeover switch 28 from the control device 25, and determines whether or not the auto-decel control is valid based on the acquired operation signal. As a result, when it is determined that the auto-decel control is effective, the ECU 29 shifts the step to step S172. On the other hand, if it is determined that the auto-decel control is not effective, the ECU 29 shifts the step to step S183.
- step S ⁇ b> 172 the ECU 29 determines whether or not an operation signal for the operation lever device 26 is acquired from the control device 25. As a result, when it is determined that the operation signal of the operation lever device 26 is not acquired, the ECU 29 shifts the step to step S173. On the other hand, when it determines with having acquired the operation signal of the operation lever apparatus 26, ECU29 makes a step transfer to step S183.
- step S173 the ECU 29 sets the low idle rotational speed to the rotational speed Vlc, ends the low idle control A, and returns the step to step S110.
- step S183 the ECU 29 sets the low idle rotational speed to the rotational speed Vlb, ends the low idle control A, and returns the step to step S110.
- step S ⁇ b> 271 of the auto-decel control B the ECU 29 determines whether or not an operation signal for the operation lever device 26 is acquired from the control device 25. As a result, when it is determined that the operation signal of the operation lever device 26 has not been acquired, the ECU 29 shifts the step to step S272. On the other hand, when it determines with having acquired the operation signal of the operation lever apparatus 26, ECU29 makes a step transfer to step S282.
- step S272 the ECU 29 sets the low idle rotation speed to the rotation speed Vlc, ends the auto-decel control B, and returns the step to step S110.
- step S282 the ECU 29 sets the rotation speed to the rotation speed Vla, ends the auto-decel control B, and returns the step to step S110.
- This configuration eliminates the need for the operator to sensuously set the low idle rotation speed in accordance with the working state. That is, in the backhoe 1 according to the present invention, the rotational speed Vla calculated based on the accelerator 27 and the rotational speed Vlb calculated based on the output torque characteristic Tp1 of the engine 9 according to the working state and the operating state of the engine 9. And the engine speed 9 is set to any one of the engine speeds Vlc which is the original low idle engine speed. Furthermore, the backhoe 1 according to the present invention determines whether or not the worker makes effective the low idle control and the auto-decel control according to the working state. As a result, engine stall can be prevented with an appropriate fuel injection amount without reducing work efficiency, and wasteful fuel consumption can be suppressed.
- the atmospheric pressure P1 detected by the atmospheric pressure sensor 30, but also the fuel temperature Tf1 detected by the fuel temperature sensor 31 and the intake air temperature Ti1 detected by the intake air temperature sensor 32 are taken into account in a more detailed manner.
- the idle speed is set. Thereby, engine stall can be prevented with an appropriate fuel injection amount, and wasteful fuel consumption can be suppressed.
- the changeover switch 28 selectively selects whether or not to enable auto-decel control. That is, the backhoe 1 in the present embodiment is configured such that the low idle control is always effective. The operator can select whether or not to enable auto-decel control by operating the changeover switch 28.
- control mode for setting the low idle speed of the engine 9 in the ECU 29 will be specifically described.
- step S150 the ECU 29 determines whether or not the calculated rotation speed Vlb is greater than the calculated rotation speed Vla. As a result, when it is determined that the rotation speed Vlb is larger than the rotation speed Vla, the ECU 29 shifts the step to step S170 (see FIG. 3B). On the other hand, when it is determined that the rotation speed Vlb is not greater than the rotation speed Vla, the ECU 29 shifts the step to step S260.
- step S170 the ECU 29 starts the low idle control A and shifts the step to step S171 (see FIG. 5).
- step S171 the low idle control A ends, the ECU 29 returns the step to step S110.
- the backhoe 1 according to the present invention is surely set to an appropriate low idle rotational speed in accordance with the working state and the engine operating state. Thereby, engine stall can be prevented with an appropriate fuel injection amount, and wasteful fuel consumption can be suppressed.
- the rotation speed Vlc may be set.
- step S471 of the automatic deceleration control B the ECU 29 determines whether or not the absorption torque of the hydraulic pump 24 is equal to or less than a predetermined value. As a result, when it is determined that the absorption torque of the hydraulic pump 24 is equal to or less than the predetermined value, the ECU 29 shifts the step to step S272. On the other hand, when it is determined that the absorption torque of the hydraulic pump 24 is not less than the predetermined value, the ECU 29 shifts the step to step S282.
- the backhoe 1 according to the present invention is set to the rotational speed Vlc with low fuel consumption in a light-load work state where the possibility of engine stall is low. Thereby, engine stall can be prevented with an appropriate fuel injection amount, and wasteful fuel consumption can be suppressed.
- the present invention can be used for construction machine technology.
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Operation Control Of Excavators (AREA)
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Abstract
Description
その結果、回転数Vlbが回転数Vlaよりも大きいと判定した場合、ECU29はステップをステップS160に移行させる(図3(b)参照)。
一方、回転数Vlbが回転数Vlaよりも大きくないと判定した場合、ECU29はステップをステップS260に移行させる。
その結果、ローアイドル制御が有効であると判定した場合、ECU29はステップをステップS170に移行させる。
一方、ローアイドル制御が有効でないと判定した場合、ECU29はステップをステップS370に移行させる。
その結果、オートデセル制御が有効であると判定した場合、ECU29はステップをステップS270に移行させる。
一方、オートデセル制御が有効でないと判定した場合、ECU29はステップをステップS370に移行させる。
その結果、オートデセル制御が有効であると判定した場合、ECU29はステップをステップS172に移行させる。
一方、オートデセル制御が有効でないと判定した場合、ECU29はステップをステップS183に移行させる。
その結果、操作レバー装置26の操作信号を取得していないと判定した場合、ECU29はステップをステップS173に移行させる。
一方、操作レバー装置26の操作信号を取得したと判定した場合、ECU29はステップをステップS183に移行させる。
その結果、操作レバー装置26の操作信号を取得していないと判定した場合、ECU29はステップをステップS272に移行させる。
一方、操作レバー装置26の操作信号を取得したと判定した場合、ECU29はステップをステップS282に移行させる。
その結果、回転数Vlbが回転数Vlaよりも大きいと判定した場合、ECU29はステップをステップS170に移行させる(図3(b)参照)。
一方、回転数Vlbが回転数Vlaよりも大きくないと判定した場合、ECU29はステップをステップS260に移行させる。
その結果、油圧ポンプ24の吸収トルクが所定値以下であると判定した場合、ECU29はステップをステップS272に移行させる。
一方、油圧ポンプ24の吸収トルクが所定値以下でないと判定した場合、ECU29はステップをステップS282に移行させる。
9 エンジン
23 油圧ポンプ
30 大気圧センサ
P1 大気圧
Tp1 出力トルク特性
Th 最大吸収トルク
Vlb 回転数
Claims (6)
- エンジンからの動力によって油圧ポンプが駆動される建設機械であって、
大気圧検出手段によって検出された大気圧に基づいてエンジンの出力トルク特性が設定され、ローアイドル回転数におけるエンジンの最大トルクが油圧ポンプの最大吸収トルクよりも大きくなるようにローアイドル回転数が設定される建設機械。 - 吸気温度検出手段によって検出された吸気温度と燃料温度検出手段によって検出された燃料温度とに基づいて前記出力トルク特性が設定される請求項1に記載の建設機械。
- 切り換え手段によって、前記出力トルク特性と前記最大吸収トルクとに基づいてローアイドル回転数を設定するか否かを選択可能に構成される請求項1に記載の建設機械。
- 切り換え手段によって、前記出力トルク特性と前記最大吸収トルクとに基づいてローアイドル回転数を設定するか否かを選択可能に構成される請求項2に記載の建設機械。
- 油圧アクチュエータによる作業が行われていない場合、ローアイドル回転数が前記出力トルク特性と前記最大吸収トルクとに基づいたローアイドル回転数に設定されないように構成される請求項1から請求項4のいずれか一項に記載の建設機械。
- 前記油圧ポンプの吸収トルクが所定値以下の場合、ローアイドル回転数が前記出力トルク特性と前記最大吸収トルクとに基づいたローアイドル回転数に設定されないように構成される請求項1から請求項4のいずれか一項に記載の建設機械。
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CN201480030566.7A CN105283650B (zh) | 2013-05-29 | 2014-02-25 | 建筑机械 |
EP14804298.9A EP3006699B1 (en) | 2013-05-29 | 2014-02-25 | Construction machine |
KR1020157035397A KR101819651B1 (ko) | 2013-05-29 | 2014-02-25 | 건설 기계 |
US14/893,699 US11118517B2 (en) | 2013-05-29 | 2014-02-25 | Construction machine |
AU2014272460A AU2014272460B2 (en) | 2013-05-29 | 2014-02-25 | Construction machine |
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EP (1) | EP3006699B1 (ja) |
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KR (1) | KR101819651B1 (ja) |
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Citations (3)
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JP2000073812A (ja) * | 1998-09-03 | 2000-03-07 | Hitachi Constr Mach Co Ltd | 油圧建設機械の油圧ポンプのトルク制御装置 |
JP2004132195A (ja) | 2002-10-08 | 2004-04-30 | Hitachi Constr Mach Co Ltd | 可変容量型油圧ポンプのトルク制御装置 |
JP2006070877A (ja) * | 2004-09-06 | 2006-03-16 | Komatsu Ltd | 作業車両のエンジンの負荷制御装置 |
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US5999872A (en) * | 1996-02-15 | 1999-12-07 | Kabushiki Kaisha Kobe Seiko Sho | Control apparatus for hydraulic excavator |
JP3383754B2 (ja) * | 1997-09-29 | 2003-03-04 | 日立建機株式会社 | 油圧建設機械の油圧ポンプのトルク制御装置 |
JP2003041950A (ja) * | 2001-07-26 | 2003-02-13 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | 建設機械のエンジン制御装置 |
JP4322807B2 (ja) * | 2002-08-26 | 2009-09-02 | 日立建機株式会社 | 建設機械の信号処理装置 |
CN100587172C (zh) * | 2004-04-08 | 2010-02-03 | 株式会社小松制作所 | 作业机械的液压驱动装置 |
JP4804137B2 (ja) | 2005-12-09 | 2011-11-02 | 株式会社小松製作所 | 作業車両のエンジン負荷制御装置 |
JP5134238B2 (ja) * | 2006-12-15 | 2013-01-30 | 株式会社小松製作所 | 作業車両のエンジン負荷制御装置 |
WO2012050136A1 (ja) * | 2010-10-13 | 2012-04-19 | 日立建機株式会社 | 建設機械の制御装置 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2000073812A (ja) * | 1998-09-03 | 2000-03-07 | Hitachi Constr Mach Co Ltd | 油圧建設機械の油圧ポンプのトルク制御装置 |
JP2004132195A (ja) | 2002-10-08 | 2004-04-30 | Hitachi Constr Mach Co Ltd | 可変容量型油圧ポンプのトルク制御装置 |
JP2006070877A (ja) * | 2004-09-06 | 2006-03-16 | Komatsu Ltd | 作業車両のエンジンの負荷制御装置 |
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US11118517B2 (en) | 2021-09-14 |
EP3006699B1 (en) | 2020-07-22 |
CN105283650A (zh) | 2016-01-27 |
AU2014272460B2 (en) | 2016-06-23 |
EP3006699A1 (en) | 2016-04-13 |
KR20160006233A (ko) | 2016-01-18 |
KR101819651B1 (ko) | 2018-01-17 |
AU2014272460A1 (en) | 2015-12-24 |
JP6116379B2 (ja) | 2017-04-19 |
US20160115947A1 (en) | 2016-04-28 |
JP2014231793A (ja) | 2014-12-11 |
CN105283650B (zh) | 2018-03-23 |
EP3006699A4 (en) | 2017-02-22 |
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