WO2011105279A1 - ハイブリッド建設機械の制御システム - Google Patents
ハイブリッド建設機械の制御システム Download PDFInfo
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- WO2011105279A1 WO2011105279A1 PCT/JP2011/053392 JP2011053392W WO2011105279A1 WO 2011105279 A1 WO2011105279 A1 WO 2011105279A1 JP 2011053392 W JP2011053392 W JP 2011053392W WO 2011105279 A1 WO2011105279 A1 WO 2011105279A1
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- main
- pump
- valve
- switching valve
- pilot
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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
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
- E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- 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
- E02F9/2075—Control of propulsion units of the hybrid type
-
- 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
-
- 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
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
-
- 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
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
- E02F9/2242—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance including an electronic controller
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2282—Systems using center bypass type changeover valves
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2285—Pilot-operated systems
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
Definitions
- This invention relates to a control system for a hybrid construction machine.
- JP2002-275945A discloses a hybrid construction machine including an engine, a generator driven by the engine, a battery for storing electric power generated by the generator, and an electric motor driven by the electric power of the battery.
- the oil discharged from the main pump maintains a high oil temperature in the hydraulic tank even when the operation valve is not operated.
- the valve body is usually cast and the spool is usually made of steel, both are made of steel, but the coefficients of thermal expansion are different.
- An object of the present invention is to provide a construction machine control system in which an operation valve is difficult to cool while supplying oil discharged from a main pump to a power generation hydraulic motor.
- a control system for a construction machine wherein the first and second main pumps are variable displacement pumps, and the first and second main pumps have a plurality of operation valves.
- 1 and 2 circuit system a main switching valve provided between the 1 and 2 circuit systems and the 1 and 2 main pumps, and a power generation hydraulic motor connected to the 1st and 2 main pumps via the main switching valve
- a generator connected to the generator hydraulic motor and a battery for storing the power generated by the generator, and a main switching valve connected to at least one circuit system generates one main pump connected thereto.
- a control system is provided that allows the other main pump to communicate with the other circuit system.
- the operation valve is not cooled too much. Therefore, the conventional inconvenience that occurs when the discharged oil of the main pump having a high oil temperature is supplied to the cooled operation valve does not occur.
- FIG. 1 is a circuit diagram of a control system for a hybrid construction machine according to the first embodiment.
- FIG. 2 is a flowchart of the control system.
- FIG. 3 is a circuit diagram of a control system for a hybrid construction machine according to the second embodiment.
- FIG. 4 is a circuit diagram of a control system for a hybrid construction machine according to the third embodiment.
- the first embodiment will be described.
- FIG. 1 shows a control system for a power shovel equipped with first and second main pumps MP1 and MP2 which are variable displacement pumps driven by an engine E equipped with a rotation speed sensor.
- the first and second main pumps MP1 and MP2 rotate coaxially.
- the generator 1 is provided in the engine E, and exhibits a power generation function using the remaining power of the engine E.
- the first main pump MP1 is connected to the first circuit system.
- the first circuit system in order from the upstream side, is an operation valve 2 that controls the swing motor, an operation valve 3 that controls the arm cylinder, an operation valve 4 for the second speed boom that controls the boom cylinder, and an operation that controls the spare attachment.
- An operation valve 6 for controlling the valve 5 and the left traveling motor is connected.
- Each of the operation valves 2 to 6 is connected to the first main pump MP1 via the neutral flow path 7 and the parallel path 8.
- a pilot pressure control throttle 9 for generating a pilot pressure is provided downstream of the operation valve 6 of the left travel motor in the neutral flow path 7.
- the throttle 9 generates a high pilot pressure upstream if the flow rate flowing therethrough is large, and generates a low pilot pressure if the flow rate is small.
- the neutral flow path 7 guides all or part of the oil discharged from the first main pump MP1 to the tank T through the throttle 9 when all the operation valves 2 to 6 are in the neutral position or in the vicinity of the neutral position. . In this case, since the flow rate passing through the throttle 9 increases, a high pilot pressure is generated.
- the throttle 9 Depending on the operation amount of the operation valves 2 to 6, a part of the pump discharge amount is led to the actuator, and a part is led from the neutral flow path 7 to the tank T.
- the throttle 9 generates a pilot pressure corresponding to the flow rate flowing through the neutral flow path 7.
- the throttle 9 generates a pilot pressure corresponding to the operation amount of the operation valves 2 to 6.
- a pilot flow path 10 is connected between the operation valve 6 and the throttle 9 in the neutral flow path 7.
- the pilot flow path 10 is connected via an electromagnetic switching valve 11 to a regulator 12 that controls the tilt angle of the first main pump MP1.
- the regulator 12 controls the displacement amount per one rotation by controlling the tilt angle of the first main pump MP1 in inverse proportion to the pilot pressure of the pilot flow path 10.
- the electromagnetic switching valve 11 is connected to the pilot hydraulic power source PP via the electromagnetic variable pressure reducing valve 13.
- the electromagnetic switching valve 11 When the electromagnetic switching valve 11 is in the normal control position, which is the normal position shown in the figure, when the regulator 12 is connected to the pilot flow path 10 and the solenoid is excited to switch to the regenerative energy control position, the regulator 12 is an electromagnetic variable pressure reducing valve. 13 is connected.
- a main switching valve 14 is connected between the first main pump MP1 and the most upstream operation valve 2 of the first circuit system.
- the main switching valve 14 is switched by a pilot pressure acting on pilot chambers 14a and 14b provided at both ends thereof.
- One pilot chamber 14a is connected to a pilot hydraulic power source PP via an electromagnetic control valve 15a, and the other pilot valve is connected.
- the chamber 14b is connected to the pilot hydraulic pressure source PP through the electromagnetic control valve 15b.
- the main switching valve 14 can be switched between a first position, which is the neutral position shown in the drawing, a second position, which is the left position in the drawing, and a third position, which is the right position in the drawing.
- the main switching valve 14 When the main switching valve 14 is maintained at the first position (neutral position), the main passage V that guides the discharge oil of the first main pump MP1 to the first circuit system is opened, and the discharge oil of the assist pump AP is changed to the first position. 1 A confluence passage W leading to the discharge side of the main pump MP1 is opened. The check valve 18 prevents the flow from the first main pump MP1 to the assist pump AP.
- the throttle passage X that guides the discharge oil of the first main pump MP1 to the first circuit system is opened, and the discharge oil of the first main pump MP1. Is opened to the hydraulic motor M for power generation. Thereby, the discharge oil of the first main pump MP1 is supplied to the power generation hydraulic motor M via the regeneration passage Y, and a part of the discharge oil passes through the throttle passage X to the first circuit system. Is also supplied.
- the solenoids of the electromagnetic switching valve 11 and the electromagnetic control valves 15a and 15b are connected to the controller C, and the controller C can control the switching operation.
- the solenoid of the electromagnetic variable pressure reducing valve 13 is also connected to the controller C, and the controller C controls the secondary pressure of the pressure reducing valve 13.
- the second main pump MP2 is connected to the second circuit system.
- the second circuit system in order from the upstream side, is an operation valve 19 for controlling a right traveling motor, an operation valve 20 for controlling a bucket cylinder, an operation valve 21 for controlling a boom cylinder, and an arm 2 speed for controlling an arm cylinder.
- An operation valve 22 is connected.
- the operation valves 19 to 22 are connected to the second main pump MP2 via the neutral flow path 23.
- the operation valve 20 and the operation valve 21 are connected to the second main pump MP ⁇ b> 2 via the parallel passage 24.
- a throttle 25 for pilot pressure control is provided on the downstream side of the operation valve 22 in the neutral flow path 23.
- the diaphragm 25 functions in exactly the same way as the diaphragm 9 of the first circuit system.
- a pilot flow path 26 is connected between the operation valve 22 and the throttle 25 at the most downstream position in the neutral flow path 23.
- the pilot flow path 26 is connected via an electromagnetic switching valve 27 to a regulator 28 that controls the tilt angle of the second main pump MP2.
- the regulator 28 controls the displacement amount per one rotation by controlling the tilt angle of the second main pump MP2 in inverse proportion to the pilot pressure of the pilot flow path 26.
- the electromagnetic switching valve 27 is connected to the pilot hydraulic power source PP via the electromagnetic variable pressure reducing valve 13.
- the regulator 28 When the electromagnetic switching valve 27 is in the normal control position shown in the figure, the regulator 28 is connected to the pilot flow path 26, and when the solenoid is excited to switch to the regenerative energy control position, the regulator 28 is an electromagnetic variable pressure reducing valve. 13 is connected. That is, the electromagnetic switching valves 11 and 27 are connected in parallel to the electromagnetic variable pressure reducing valve 13, and the same pressure controlled by the electromagnetic variable pressure reducing valve 13 is guided to these electromagnetic switching valves 11 and 27.
- a main switching valve 29 is connected between the second main pump MP2 and the most upstream operating valve 19 in the second circuit system.
- the main switching valve 29 is switched by the pilot pressure acting on the pilot chambers 29a and 29b provided at both ends thereof, and one pilot chamber 29a is connected to the pilot hydraulic power source PP via the electromagnetic control valve 16a, and the other pilot valve
- the chamber 29b is connected to the pilot hydraulic pressure source PP through the electromagnetic control valve 16b.
- the main switching valve 29 can be switched between a first position, which is the neutral position shown in the figure, a second position, which is the left position in the drawing, and a third position, which is the right position in the drawing.
- the main switching valve 29 When the main switching valve 29 is switched to the first position (neutral position), the main passage V that guides the discharge oil of the second main pump MP2 to the second circuit system is opened, and the discharge oil of the assist pump AP is changed to the first position. 2
- the confluence passage W leading to the discharge side of the main pump MP2 is opened.
- the check valve 31 prevents the flow from the second main pump MP2 to the assist pump AP.
- the solenoids of the electromagnetic switching valve 27 and the electromagnetic control valves 16a and 16b are connected to the controller C, and the controller C can control the switching operation.
- the operation valves 2 to 6 and 19 to 22 are provided with a neutral position detection unit for detecting the neutral position.
- the neutral position detection unit electrically detects the neutral position of the operation valves 2 to 6 and 19 to 22. It may be detected using a typical sensor, or may be detected hydraulically.
- pilot lines for connecting the operation valves 2 to 6 and 19 to 22 in series.
- the pilot line is blocked and its pressure changes. By converting this pressure change into an electric signal, the operation valves 2 to 6 And 19 to 22 neutral positions can be detected.
- an electric signal indicating whether or not the operation valves 2 to 6 and 19 to 22 are in the neutral position is input to the controller C.
- the power generation hydraulic motor M is linked to the power generator 32, and when the power generation hydraulic motor M rotates, the power generator 32 rotates to perform a power generation function.
- the electric power generated by the generator 32 is charged to the battery 34 via the inverter 33.
- the battery 34 is connected to the controller C, and the controller C grasps the charge amount of the battery 34.
- the power generation hydraulic motor M is a variable displacement hydraulic motor, and its tilt angle can be controlled by a regulator 35 connected to the controller C.
- the battery charger 36 is used for charging the battery 34 with the electric power generated by the generator 1.
- the battery charger 36 is also connected to a separate power source 37 such as a household power source.
- Assist pump AP is linked to power generation hydraulic motor M.
- the assist pump AP rotates in conjunction with the power generation hydraulic motor M.
- the assist pump AP is a variable displacement pump, and its tilt angle is controlled by a regulator 38.
- the tilt angle of the assist pump AP is minimized and the load is set so that the load hardly acts on the power generation hydraulic motor M. Further, when the generator 32 is caused to function as an electric motor, the assist pump AP rotates to exhibit the pump function.
- the controller C determines that the actuators connected to the operation valves 2 to 6 and 19 to 22 are in the operating state when all the operation valves 2 to 6 and 19 to 22 are not in the neutral position.
- the solenoids of the electromagnetic switching valves 11 and 27, the electromagnetic control valves 15a, 15b, 16a and 16b, and the electromagnetic variable pressure reducing valve 13 are not excited, and the respective valves are maintained in the normal state.
- the main switching valves 14, 29 Is held at the first position, which is the neutral position shown in the figure, and guides the oil discharged from the first and second main pumps MP1, MP2 to the respective circuit systems.
- the flow rate flowing through the neutral flow paths 7 and 23 changes according to the operation amount of the operation valve.
- the pilot pressure generated upstream of the throttles 9 and 25 for generating the pilot pressure changes in accordance with the flow rate flowing through the neutral flow paths 7 and 23.
- the regulators 12 and 28 control the tilt angles of the first and second main pumps MP1 and MP2 in accordance with the change in pilot pressure.
- the regulators 12 and 28 increase the tilt angle and increase the displacement amount per rotation of the first and second main pumps MP1 and MP2.
- the regulators 12 and 28 decrease the tilt angle as the pilot pressure increases, thereby reducing the displacement amount per rotation of the first and second main pumps MP1 and MP2.
- the first and second main pumps MP1 and MP2 discharge a flow rate corresponding to the required flow rate corresponding to the operation amount of the operation valve.
- the discharge oil of the first and second main pumps MP1 and MP2 is supplied to the power generation hydraulic motor M through the regeneration passage Y.
- the power generation hydraulic motor M rotates to rotate the generator 32, and the power generator 32 exhibits a power generation function.
- the generated power is charged in the battery 34 via the inverter 33.
- the throttle passage X opens, so that part of the discharged oil from the first and second main pumps MP1 and MP2 passes through the throttle passage X. Supplied to the first and second circuit systems.
- the oil discharged from the first and second main pumps MP1 and MP2 circulates with the power generation hydraulic motor M, so the oil temperature is kept high. Therefore, the operation valves 2 to 6 and 19 to 22 in the circuit systems are warmed by the hydraulic oil guided to the first and second circuit systems.
- the solenoids of the electromagnetic control valves 15b and 16b are excited to switch the electromagnetic control valves 15b and 16b from the illustrated normal position to the switching position, the pilot chambers 14b and 29b of the main switching valves 14 and 29 are piloted. The pressure is guided, and the main switching valves 14 and 29 are switched to the third position which is the right side position in the drawing.
- the main switching valves 14 and 29 are switched to the third position, the first and second main pumps MP1 and MP2 are connected to the first and second circuit systems through the main passages V, respectively.
- the reason why the third switching position is provided in the main switching valves 14 and 29 is to join the discharge oil of the assist pump AP to only one circuit system and keep the discharge amount of the other main pump to a minimum. is there.
- the main switching valve 14 is kept in the neutral position, and the electromagnetic control valve Only the solenoid 16b is excited to switch the main switching valve 29 to the third position which is the right position.
- the oil discharged from the second main pump MP2 passes through the main passage V and flows only into the neutral flow path 23 of the second circuit system in which all the operation valves 19 to 22 are maintained at the neutral position.
- the upstream pressure is increased, and the discharge amount of the second main pump MP2 is kept to a minimum.
- Controller C reads the operating state of each actuator based on the signal from the neutral position detector (step S1). The controller C determines whether or not all the operation valves 2 to 6 and 19 to 22 are in the neutral position (step S2). If any of the operation valves is in the switching position other than the neutral position, the operation is performed. It is determined that the actuator connected to the valve is working, and the process proceeds to step S3.
- step S3 it is determined whether or not assist of the assist pump AP is required according to an input signal from the operator. If the operator has input a signal indicating that assistance is required, the controller C proceeds to step S4, keeps the solenoids of the electromagnetic control valves 15a, 15b, 16a, 16b in a non-excited state, and the main switching valve 14 , 29 are held in the first position, which is the neutral position. If the main switching valves 14 and 29 are held in the first position, the discharge oil of the assist pump AP merges with the discharge oil of the first and second main pumps MP1 and MP2, and is supplied to the first and second circuit systems. Additional work is performed (step S5).
- step S3 if a signal requiring assistance is not input from the operator, the controller C moves to step S6, and excites the solenoids of the electromagnetic control valves 15b and 16b, and the main switching valves 14 and 29. Is switched to the third position which is the right position. In this case, the work is performed in a state where there is no assist from the assist pump AP (step S7).
- step S2 If it is determined in step S2 that all the operation valves are in the neutral position, it is determined that each actuator is in a non-working state, and the process proceeds to step S8.
- step S8 it is determined whether or not a standby regeneration signal is input from the operator. If no standby regeneration signal is input, the process returns to step S1.
- step S8 If a standby regeneration signal is input in step S8, the controller C proceeds to step S9 and determines whether or not the battery 34 is in a state near full charge.
- the controller C proceeds to steps S10 and S11, keeps the electromagnetic switching valves 11 and 27 in a non-excited state, and turns off the electromagnetic control valves 15a, 15b, 16a, and 16b.
- the main switching valves 14 and 29 are switched to the illustrated normal positions, and the process returns to step S1.
- the discharge oil of the first and second main pumps MP1 and MP2 passes through the main passage V of the main switching valves 14 and 29 from the neutral flow paths 7 and 23. It goes to the regulators 12 and 28 through the electromagnetic switching valves 11 and 27 via the paths 10 and 26.
- the regulators 12 and 28 maintain the discharge amount of the main pumps MP1 and MP2 which are variable displacement pumps to a minimum, that is, a standby flow rate by the pilot pressure generated upstream of the throttles 9 and 25. And returned to the tank T.
- step S9 If the controller C determines that the charge amount of the battery 34 is insufficient in step S9, the controller C moves to step S12 and excites the solenoids of the electromagnetic control valves 15a and 16a, and the electromagnetic control valves 15b and 16b. Is kept in a non-excited state. As a result, the pressure from the pilot hydraulic pressure source PP is guided to the pilot chambers 14a and 29a of the main switching valves 14 and 29, so that the main switching valves 14 and 29 are switched to the second position, which is the left position shown in the figure. 1, 2 main pumps MP1, MP2 communicate with the power generation hydraulic motor M.
- step S13 to switch the electromagnetic switching valves 11 and 27 from the normal control position, which is the normal position, to the regenerative energy control position, thereby establishing communication between the regulators 12 and 28 and the pilot flow paths 10 and 26.
- the electromagnetic variable pressure reducing valve 13 is communicated with the regulators 12 and 28.
- the controller C proceeds to step S14 and the rotation provided in the engine E is performed. Based on the signal from the speed sensor, it is determined whether the current rotational speed of the engine E is high or low. The criterion for high speed or low speed is stored in the controller C in advance.
- step S15 controls the electromagnetic variable pressure reducing valve 13 to reduce the secondary pressure of the first and second main pumps MP1 and MP2 per rotation. Is set to be near the minimum.
- the amount of displacement per rotation of the first and second main pumps MP1 and MP2 is set to the minimum vicinity even if the amount of displacement per rotation is small. This is because the discharge amount per unit time of the 1 and 2 main pumps MP1 and MP2 can be secured by the rotational speed of the engine E.
- step S14 determines the charging status of the battery 34 in step S16. If it is determined that the amount of charge of the battery is large, the controller C calculates the required charge amount based on the current charge amount, and determines the pump discharge amount according to the required charge amount (step S17).
- the controller C moves to step S19 and controls the exciting current of the electromagnetic variable pressure reducing valve 13.
- the secondary pressure of the electromagnetic variable pressure reducing valve 13 is controlled in accordance with the exciting current, and the controlled secondary pressure acts on the regulators 12 and 28. Accordingly, the discharge amounts of the first and second main pumps MP1 and MP2 ensure the discharge amount necessary for charging the required charge amount.
- step S16 when it is determined in step S16 that the charge amount of the battery 34 is small, the controller C calculates the required charge amount based on the current charge amount, and determines the pump discharge amount according to the required charge amount. (Step S18). In this case, the discharge amounts of the first and second main pumps MP1 and MP2 are larger than the standby flow rate.
- the standard for determining the amount of charge is stored in the controller C in advance.
- the controller C moves to step S19 and controls the exciting current of the electromagnetic variable pressure reducing valve 13.
- the secondary pressure of the electromagnetic variable pressure reducing valve 13 is controlled in accordance with the exciting current, and the controlled secondary pressure acts on the regulators 12 and 28. Accordingly, the discharge amounts of the first and second main pumps MP1 and MP2 ensure the discharge amount necessary for charging the required charge amount.
- the electromagnetic variable pressure reducing valve 13 is controlled, the discharge amounts of the first and second main pumps MP1, MP2 are controlled according to the controlled secondary pressure, the power generation hydraulic motor M operates according to the discharge amount, and the standby Regenerative control is executed (step S20).
- the electromagnetic variable pressure reducing valve 13 can be controlled to freely control the pressure guided to the regulators 12 and 28, so that the energy for charging the battery 34 is not insufficient and the pump efficiency is reduced. Because it uses good points, energy loss is reduced.
- the tilt angles of the first and second main pumps MP1 and MP2 can be freely controlled, there is no need to increase the engine rotation speed in order to increase the discharge amount of the main pump, and energy loss is reduced accordingly. .
- the power generation hydraulic motor M and the assist pump AP are directly connected via the main switching valves 14 and 29, the first and second main pumps MP1 and MP2 and the power generation It is not necessary to provide a special valve between the hydraulic motor M for operation or between the first and second main pumps MP1 and MP2 and the assist pump AP, and the circuit configuration can be simplified correspondingly.
- the main switching valve 14 connected to the first circuit system is a two-position four-port valve.
- the main switching valve 14 is provided with a pilot chamber on one side, and the spring force of the spring is applied to the side facing the pilot chamber.
- the pilot chamber of the main switching valve 14 is connected to a pilot hydraulic power source PP via an electromagnetic control valve 15b.
- the main switching valve 14 opens the main passage V that guides the discharge oil of the first main pump MP1 to the first circuit system, and discharges the discharge oil of the assist pump AP to the first main pump MP1.
- a junction passage W for joining the discharged oil is opened.
- the other main switching valve 29 when the other main switching valve 29 is in the first position shown in the figure, which is the neutral position, the main passage V and the junction passage W are opened as in the first embodiment.
- the pilot pressure guided to the pilot chamber 29a is switched to the second position, which is the left position in the drawing, only the regeneration passage Y is opened.
- the pilot pressure guided to the pilot chamber 29b is switched to the third position, which is the right position in the drawing, only the main passage V is opened.
- the position at which the first main pump MP1 communicates with the power generation hydraulic motor M in the main switching valve 14 is omitted.
- only the second main pump MP2 drives the power generation hydraulic motor M.
- one main switching valve 14 is held in the illustrated normal position, and the other main switching valve is 29 is switched to the third position which is the right side position in the drawing.
- the discharge oil of the assist pump AP merges only with the discharge oil of the first main pump MP1.
- the second main pump MP2 supplies the discharged oil to the second circuit system while maintaining the standby flow rate.
- the discharge oil of the assist pump AP merges only with the discharge oil of the second main pump MP2.
- the first main pump MP1 supplies the discharged oil to the first circuit system while maintaining the standby flow rate.
- the solenoid of the electromagnetic switching valve 11 is excited and switched to the open position, the pilot pressure of the pilot hydraulic power source PP acts on the regulator 12 to keep the discharge amount of the first main pump MP1 to a minimum. Therefore, the minimum discharge amount of the first main pump MP1 flows into the neutral flow path 7 to warm the entire operation valve.
- the third embodiment will be described.
- the third embodiment shown in FIG. 4 is provided with pilot operation mechanisms PV1 to PV7 for controlling the pilot pressure for switching the operation valves 2 to 6 and 9 to 22, but these pilot operation mechanisms PV1 to PV7 are The discharge pressure of the pilot pump PP is controlled and output.
- the pilot pressure generated in the pilot operation mechanisms PV1 to PV7 is selected by a plurality of high pressure selection valves 39, and the maximum pressure is guided to the regulators 12 and 28 of the first and second variable displacement pumps MP1 and MP2.
- the pilot operating mechanism PV1 controls the pilot pressure led to the operating valve 2 that controls the swing motor
- the pilot operating mechanism PV2 controls the pilot pressure led to the operating valves 3 and 22 that control the arm cylinder
- the pilot operating mechanism PV3 is the boom.
- the pilot pressure led to the operation valves 4 and 21 for controlling the cylinder is controlled
- the pilot operation mechanism PV4 controls the pilot pressure led to the operation valve 5 for controlling the spare actuator
- the pilot operation mechanism PV5 controls one traveling motor.
- the pilot pressure guided to the operating valve 6 is controlled
- the pilot operating mechanism PV6 controls the pilot pressure guided to the operating valve 19 that controls the other traveling motor
- the pilot operating mechanism PV7 is guided to the operating valve 20 that controls the bucket cylinder.
- the pilot pressure is controlled.
- the pilot pressures controlled by the pilot operation mechanisms PV1 to PV7 are kept zero when the operation valves 2 to 6 and 19 to 22 related to the pilot operation mechanisms PV1 to PV7 are kept in the neutral positions, and the operation pressures of the operation valves 2 to 6 and 19 to 22 It becomes high when switching each.
- the pressure guided to the first and second variable displacement pumps MP1 and MP2 is opposite to that of the first and second embodiments.
- the regulators 12 and 28 provided in the first and second variable displacement pumps MP1 and MP2 keep the discharge amount of the first and second variable displacement pumps MP1 and MP2 to a minimum and the pilot pressure becomes high when the pilot pressure is zero. Accordingly, control is performed to increase the discharge amount of the first and second variable displacement pumps MP1, MP2.
- the present invention can be used for hybrid construction machines such as power shovels.
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
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- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
Description
Claims (3)
- 建設機械の制御システムであって、
可変容量ポンプである一対の第1,2メインポンプと、
前記第1,2メインポンプに接続し、複数の操作弁を有する第1,2回路系統と、
前記第1,2回路系統と前記第1,2メインポンプとの間に設けたメイン切換弁と、
前記メイン切換弁を介して前記第1,2メインポンプに接続した発電用油圧モータと、
前記発電用油圧モータに連結された発電機と、
前記発電機が発電した電力を蓄えるバッテリと、
を備え、
少なくとも一方の前記回路系統に接続した前記メイン切換弁がそれに接続した一方の前記メインポンプを前記発電用油圧モータに連通する位置にある場合、他方の前記回路系統に接続した前記メイン切換弁は他方の前記メインポンプを他方の前記回路系統に連通させる制御システム。 - 請求項1に記載の制御システムであって、
前記メイン切換弁は、前記メインポンプを前記発電用油圧モータに接続する位置にある場合、前記メイン切換弁内の絞り通路を介して前記メインポンプをそれに接続した前記回路系統に連通させる制御システム。 - 請求項1に記載の制御システムであって、
一方の前記回路系統に接続した前記メイン切換弁は、ノーマル位置において、一方の前記メインポンプをそれに接続した前記回路系統に接続するメイン通路と、アシストポンプの吐出油を前記メインポンプにチェック弁を介して合流させる合流通路とを開き、切換位置において、前記メイン通路を開いて前記合流通路を閉じる制御システム。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112011100649.7T DE112011100649B4 (de) | 2010-02-23 | 2011-02-17 | Steuersystem für eine Hybrid-Baumaschine |
KR1020127017193A KR101390633B1 (ko) | 2010-02-23 | 2011-02-17 | 하이브리드 건설 기계의 제어 시스템 |
US13/579,925 US9127438B2 (en) | 2010-02-23 | 2011-02-17 | Control system for hybrid construction machine |
CN201180008035.4A CN102741562B (zh) | 2010-02-23 | 2011-02-17 | 混合动力施工机械的控制系统 |
Applications Claiming Priority (2)
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JP2010037353A JP5350292B2 (ja) | 2010-02-23 | 2010-02-23 | ハイブリッド建設機械の制御装置 |
JP2010-037353 | 2010-02-23 |
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WO2011105279A1 true WO2011105279A1 (ja) | 2011-09-01 |
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PCT/JP2011/053392 WO2011105279A1 (ja) | 2010-02-23 | 2011-02-17 | ハイブリッド建設機械の制御システム |
Country Status (6)
Country | Link |
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US (1) | US9127438B2 (ja) |
JP (1) | JP5350292B2 (ja) |
KR (1) | KR101390633B1 (ja) |
CN (1) | CN102741562B (ja) |
DE (1) | DE112011100649B4 (ja) |
WO (1) | WO2011105279A1 (ja) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2722530B1 (en) * | 2011-06-15 | 2017-04-05 | Hitachi Construction Machinery Co., Ltd. | Power regeneration device for work machine |
US9303387B2 (en) * | 2012-11-01 | 2016-04-05 | Husco International, Inc. | Hydraulic system with open loop electrohydraulic pressure compensation |
JP5968216B2 (ja) * | 2012-12-28 | 2016-08-10 | 住友建機株式会社 | 道路舗装機械における発電機制御装置及びその発電機制御方法 |
CN105164428B (zh) * | 2013-02-15 | 2017-08-25 | 派克汉尼芬公司 | 可变负载感测开放式中心混合系统 |
JP6190728B2 (ja) * | 2014-01-24 | 2017-08-30 | Kyb株式会社 | ハイブリッド建設機械の制御システム |
JP6270704B2 (ja) * | 2014-12-10 | 2018-01-31 | 川崎重工業株式会社 | 建設機械の油圧駆動システム |
JP2018044658A (ja) * | 2016-09-16 | 2018-03-22 | Kyb株式会社 | ハイブリッド建設機械の制御システム及び制御方法 |
CN109930836B (zh) * | 2019-02-21 | 2020-12-15 | 嘉兴市金辉建设有限公司 | 一种可自动切换的混合动力混凝土浇注泵 |
JP6955524B2 (ja) * | 2019-03-26 | 2021-10-27 | 株式会社日立建機ティエラ | バッテリ式作業機械 |
DE102021214704A1 (de) | 2021-12-20 | 2023-06-22 | Robert Bosch Gesellschaft mit beschränkter Haftung | Hydraulisches System |
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- 2011-02-17 KR KR1020127017193A patent/KR101390633B1/ko not_active IP Right Cessation
- 2011-02-17 WO PCT/JP2011/053392 patent/WO2011105279A1/ja active Application Filing
- 2011-02-17 US US13/579,925 patent/US9127438B2/en not_active Expired - Fee Related
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Also Published As
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JP5350292B2 (ja) | 2013-11-27 |
US20120312007A1 (en) | 2012-12-13 |
DE112011100649T5 (de) | 2012-12-27 |
CN102741562B (zh) | 2015-01-21 |
KR20120092172A (ko) | 2012-08-20 |
US9127438B2 (en) | 2015-09-08 |
JP2011174490A (ja) | 2011-09-08 |
DE112011100649B4 (de) | 2015-12-24 |
CN102741562A (zh) | 2012-10-17 |
KR101390633B1 (ko) | 2014-04-29 |
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