CN103924627A - Automatic idle speed system and method of electro-hydraulic hybrid-driving engineering machine - Google Patents
Automatic idle speed system and method of electro-hydraulic hybrid-driving engineering machine Download PDFInfo
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- CN103924627A CN103924627A CN201410151812.6A CN201410151812A CN103924627A CN 103924627 A CN103924627 A CN 103924627A CN 201410151812 A CN201410151812 A CN 201410151812A CN 103924627 A CN103924627 A CN 103924627A
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Abstract
The invention provides an automatic idle speed system and method of an electro-hydraulic hybrid-driving engineering machine. The automatic idle speed method includes the following steps: (1) setting idle speed time, a pilot pressure threshold value, a hydraulic energy accumulator pressure judgment threshold value and the like, (2) detecting pilot handle pressure signals to judge whether the automatic idle speed system gets into an automatic idle speed mode or not, (3) when the stopping time of the automatic idle speed system is longer than the idle speed time, executing the next step, (4) when the difference value between the pressure of a hydraulic energy accumulator and the maximum pressure of a load is smaller than the negative pressure judgment threshold value, executing the step (5), and when the difference value between the pressure of the hydraulic energy accumulator and the maximum pressure of the load is larger than or equal to the negative pressure judgment threshold value, executing the step (6), (5) enabling an electromotor to work in an electric mode, and enabling a metering pump/motor to work in a pump mode, (6) enabling the electromotor to work in the electric mode, and unloading hydraulic oil of the metering pump/motor through a multi-way valve, and (7) getting into the working mode, and detecting the pressure of an outlet of the metering pump/motor. According to the automatic idle speed system and method, the problem that when the automatic idle speed is stopped, the pressure for overcoming the load can not be rapidly achieved through the outlet of the hydraulic pump can be solved, and recycled hydraulic energy can be converted into electric energy in the automatic idle speed mode.
Description
[technical field]
The present invention relates to a kind of auto idle speed system and method for electric liquid combination drive engineering machinery, be applicable to have the engineering machinery of electric liquid combination drive configuration.
[background technology]
Along with being on the rise of energy shortage in world wide and problem of environmental pollution, energy-conserving and emission-cutting technology is the focus of studying at present.Hydraulic crawler excavator is the engineering machinery that a kind of power ratio is larger, but the overall utilization of its energy is lower.Hydraulic crawler excavator is realized energy conservation, reduced discharge is the target that industry lays siege to always.Hybrid power actuation techniques and electric drive technology are current study hotspots.
The auto idle speed operating mode of engineering machinery accounts for total run time and is approximately n and take hydraulic crawler excavator as example, when operating grip stops moving after a period of time, reduce engine speed to the first auto idle speed, operating grip continues to quit work after a period of time, reduce again engine speed to the second auto idle speed, in whole auto idle speed running, if operating grip leaves meta, adjust at once motor to the corresponding rotating speed of target of throttle.Engineering machinery auto idle speed pattern can effectively reduce the power output of motor.But traditional auto idle speed pattern also has the following disadvantages: during auto idle speed, banked direction control valves is in meta, all hydraulic oil all passes through the Road oil sump tank off-load of banked direction control valves, cause the outlet pressure of hydraulic pump lower, therefore, when operating grip leaves meta, if the required pressure of load is larger, because the speed dynamic characteristic of motor is poor, must cause hydraulic pump outlet to be difficult to Rapid Establishment rises and overcomes the required pressure of load, so the rotating speed of general auto idle speed can not be too low, thereby the rate of discharge of hydraulic pump is still larger when causing auto idle speed, still there is a large amount of meta throttling losses in system, in addition, under auto idle speed pattern, although the rotating speed of motor has reduced, load torque is also less, and motor is now operated in the slow-speed of revolution and low moment of torsion region, and fuel economy is now poor, if can meet under the prerequisite of condition of work, the power output of motor is suitably provided, can improves engine efficiency, can further save fuel oil.
[summary of the invention]
One of the technical problem to be solved in the present invention, be to provide a kind of auto idle speed system of electric liquid combination drive engineering machinery, while not only effectively solving auto idle speed cancellation, hydraulic pump outlet is difficult to the problem of Rapid Establishment load pressure, simultaneously owing to reclaiming the hydraulic energy of (turntable is braked and mechanical arm is transferred) by energy, can convert electric energy in auto idle speed pattern, for next work ready.
The present invention realizes one of above-mentioned technical problem like this:
A kind of auto idle speed system of electric liquid combination drive engineering machinery, described auto idle speed system comprises pilot operated handle, the first pressure sensor, the second pressure sensor device, electric weight storage element, electric machine controller, the first one way valve, the first overflow valve, pioneer pump, quantitative pump/motor, motor, the first solenoid operated directional valve, the second solenoid operated directional valve, the second overflow valve, the second one way valve, the 5th pressure sensor, banked direction control valves, energy recovery unit, the 3rd overflow valve, hydraulic accumulator, the 3rd pressure sensor, shuttle valve, drive oil cylinder, the 4th pressure sensor, the 3rd solenoid operated directional valve, assembly controller,
Wherein, described motor, pioneer pump and quantitative pump/motor are connected with shaft mechanical; The outlet of described quantitative pump/motor connects the oil-in of the second one way valve; The A mouth of the oil-in of the second overflow valve, the second solenoid operated directional valve, the P mouth of banked direction control valves is connected with the oil-out of P1 mouth all with the second one way valve, the oil-out connected tank of the second overflow valve, the T mouth connected tank of banked direction control valves, the A mouth of banked direction control valves connects the rodless cavity that drives oil cylinder, the B mouth of banked direction control valves connects the rod chamber that drives oil cylinder, and the D mouth of banked direction control valves connects the A mouth of the 3rd solenoid operated directional valve, and the B mouth of the 3rd solenoid operated directional valve connects fuel tank;
The B mouth of the second solenoid operated directional valve, the A mouth of the first solenoid operated directional valve, the oil-in of the 3rd overflow valve, the 3rd pressure sensor and energy recovery unit are all connected to the hydraulic fluid port of hydraulic accumulator, the oil-out connected tank of the 3rd overflow valve;
The B mouth of the first solenoid operated directional valve, the oil-out of the first one way valve is connected to the oil-in of quantitative pump/motor, the oil-in connected tank of the first one way valve; Drive the rod chamber of oil cylinder to be connected with two oil-ins of shuttle valve respectively with rodless cavity, the oil-out of shuttle valve connects the 4th pressure sensor;
The P mouth of pilot operated handle, the oil-in of the first overflow valve all connect the oil-out of pioneer pump, and the T mouth of the oil-out of the first overflow valve and pilot operated handle is connected fuel tank, and described motor is electrical connected by electric machine controller and electric weight storage element;
Described pilot operated handle is connected with banked direction control valves, described pilot operated handle is connected to assembly controller by the first pressure sensor and the second pressure sensor respectively, described hydraulic accumulator is connected with described assembly controller by the 5th pressure sensor by the 4th pressure sensor, described quantitative pump/motor by the 3rd pressure sensor, described shuttle valve, and described assembly controller is also connected with electric machine controller, the first solenoid operated directional valve, the first solenoid operated directional valve, the first solenoid operated directional valve respectively.
Two of the technical problem to be solved in the present invention, be to provide a kind of auto idle speed method of electric liquid combination drive engineering machinery, while not only effectively solving auto idle speed cancellation, hydraulic pump outlet is difficult to the problem of Rapid Establishment load pressure, simultaneously owing to reclaiming the hydraulic energy of (turntable is braked and mechanical arm is transferred) by energy, can convert electric energy in auto idle speed pattern, for next work ready.
The present invention realizes two of above-mentioned technical problem like this:
An auto idle speed method for electric liquid combination drive engineering machinery, comprises the following steps:
Step (1), setting dead time are that Tc, pilot pressure threshold value are p
ic, hydraulic accumulator pressure judgment threshold △ pc, hydraulic accumulator pressure bound p
1min, p
1max;
Step (2), detection pilot handle pressure signal p
i1, p
i2judge whether to enter auto idle speed pattern:
Pilot force signal p in the ban
i1, p
i2all be less than pilot pressure threshold value p
ictime, decision-making system has stopped action, enters step (3); Otherwise system enters mode of operation, judge auto idle speed mode failures even and exit auto idle speed control program, enter step (7);
Step (3), when dead time Tc that system off-air time t surpass to set, enter step (4), otherwise exit auto idle speed control program;
Step (4), detection hydraulic accumulator force value p
i3with load maximum value p
i4:
Force value p when hydraulic accumulator
i3with load maximum value p
i4difference meet: p
i3-p
i4during > △ pc, the hydraulic oil of hydraulic accumulator, be discharged into the oil-in of quantitative pump/motor, constant displacement pump/motor operations is in motoring mode, drive motor is operated in power generation mode, the hydraulic energy of hydraulic accumulator is converted to electrical power storage in electric weight storage element, and the rotating speed of target of motor is set at the most effective point of power generation mode according to motor; Otherwise, when the pressure p of hydraulic accumulator
i3with load maximum pressure p
i4difference meet: p
i3-p
i4during <-△ pc, enter step (5); When meeting :-△ pc≤p
i3-p
i4during≤△ pc, enter step (6);
Step (5), when the pressure p of hydraulic accumulator
i3with load maximum pressure p
i4difference meet: p
i3-p
i4during <-△ pc, motor is operated in electric model, and constant displacement pump/motor operations is in pump pattern, the hydraulic oil of all quantitative pump/motors enters hydraulic accumulator, hydraulic accumulator is carried out oil-filled, the rotating speed of target of motor is according to most effective work of electric model
Step (6), when the pressure p of hydraulic accumulator
i3with load maximum pressure p
i4difference meet :-△ pc≤p
i3-p
i4during≤△ pc, motor is operated in electric model, and the rotating speed of target of motor is set by minimum speed, and quantitatively the hydraulic oil of pump/motor passes through the Road oil return opening D oil sump tank of banked direction control valves, realizes off-load;
Step (7), system enter mode of operation, detect quantitative pump/motor outlet pressure p
i5:
Motor is operated in electric model, and rotating speed of target is according to pilot pressure signal p
i1, p
i2size calculate to obtain; Pressure p when hydraulic accumulator
i3be greater than hydraulic accumulator low pressure limit p
1mintime, the hydraulic oil of hydraulic accumulator is discharged into the oil-in of quantitative pump/motor, improves the inlet pressure of quantitative pump/motor; Outlet pressure p when quantitative pump/motor
i5be less than load maximum pressure p
i4time, the logical oil-out that is discharged into quantitative pump/motor of pressure oil of hydraulic accumulator, rises and overcomes the required pressure of load in order to Rapid Establishment.
Tool of the present invention has the following advantages:
(1) consider in electric liquid combination drive hydraulic crawler excavator, because motor replaces after Engine driven Hydraulic Pump, the relative motor of motor has the wide feature of the range of speeds, therefore when auto idle speed, quantitatively the minimum speed of pump/motor can be set in the minimum speed in the working range of a hydraulic pump and motor, realize prexxure of the hydraulic pump and flow off-load, can reduce the meta throttling loss of hydraulic system.
(2) during idling operation, when the pressure of accumulator is less than load maximum pressure, constant displacement pump/motor operations is in pump pattern, oil-filled to hydraulic accumulator, for next cycle, to set up the required pressure of load ready, when system works, the hydraulic oil of hydraulic accumulator can be discharged into the outlet of quantitative pump/motor, is used for Rapid Establishment to rise and overcome the required pressure of load.This auto idle speed method has the feature of the self-adapting load pressure of energy storage pressure, overcomes traditional excavator when auto idle speed is cancelled, if the outlet of quantitative pump/motor is difficult to Rapid Establishment and rises and overcome the required pressure of load when engine start machine rotating speed is lower;
(3) during idling operation, when the pressure of accumulator is higher, constant displacement pump/motor operations is in motoring mode, the hydraulic oil of hydraulic accumulator can discharge, drive quantitative pump/motor and dynamoelectric machine, become electrical power storage in electric weight storage element the power conversion of hydraulic accumulator, for next cycling, prepare, extended the working time of electric weight storage element.
[accompanying drawing explanation]
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the schematic diagram of the auto idle speed system of a kind of electric liquid combination drive engineering machinery of the present invention.
Accompanying drawing identifier declaration:
1, pilot operated handle 2, the first pressure sensor
3, the second pressure sensor 4, electric weight storage element
5, electric machine controller 6, the first one way valve
7, the first overflow valve 8, pioneer pump
9, quantitative pump/motor 10, motor
11, the first solenoid operated directional valve 12, the second solenoid operated directional valve
13, the second overflow valve 14, the second one way valve
15, the 5th pressure sensor 16, banked direction control valves
17, energy recovery unit 18, the 3rd overflow valve
19, hydraulic accumulator 20, the 3rd pressure sensor
21, shuttle valve 22, driving oil cylinder
23, the 4th pressure sensor 24, the 3rd solenoid operated directional valve
25, assembly controller
[specific embodiment]
Refer to shown in Fig. 1, embodiments of the invention are described in detail.
Emphasis is consulted Fig. 1, the present invention relates to a kind of auto idle speed system of electric liquid combination drive engineering machinery, described auto idle speed system comprises pilot operated handle 1, the first pressure sensor 2, the second pressure sensor device 3, electric weight storage element 4, electric machine controller 5, the first one way valve 6, the first overflow valve 7, pioneer pump 8, quantitative pump/motor 9, motor 10, the first solenoid operated directional valve 11, the second solenoid operated directional valve 12, the second overflow valve 13, the second one way valve 14, the 5th pressure sensor 15, banked direction control valves 16, energy recovery unit 17, the 3rd overflow valve 18, hydraulic accumulator 19, the 3rd pressure sensor 20, shuttle valve 21, drive oil cylinder 22, the 4th pressure sensor 23, the 3rd solenoid operated directional valve 24, assembly controller 25,
Wherein, described motor 10, pioneer pump 8 and quantitative pump/motor 9 are connected with shaft mechanical; The outlet of described quantitative pump/motor 9 connects the oil-in of the second one way valve 14; The A mouth of the oil-in of the second overflow valve 13, the second solenoid operated directional valve 12, the P mouth of banked direction control valves 16 is connected with the oil-out of P1 mouth all with the second one way valve 14, the oil-out connected tank of the second overflow valve 13, the T mouth connected tank of banked direction control valves 16, the A mouth of banked direction control valves 16 connects the rodless cavity that drives oil cylinder 22, the B mouth of banked direction control valves 16 connects the rod chamber that drives oil cylinder 22, and the D mouth of banked direction control valves 16 connects the A mouth of the 3rd solenoid operated directional valve 24, and the B mouth of the 3rd solenoid operated directional valve 24 connects fuel tank;
The A mouth of the B mouth of the second solenoid operated directional valve 12, the first solenoid operated directional valve 11, the oil-in of the 3rd overflow valve 18, the 3rd pressure sensor 20 and energy recovery unit 17 are all connected to the hydraulic fluid port of hydraulic accumulator 19, the oil-out connected tank of the 3rd overflow valve 18;
The B mouth of the first solenoid operated directional valve 11, the oil-out of the first one way valve 6 is connected to the oil-in of quantitative pump/motor 9, the oil-in connected tank of the first one way valve 6; Drive the rod chamber of oil cylinder 22 to be connected with two oil-ins of shuttle valve 21 respectively with rodless cavity, the oil-out of shuttle valve 21 connects the 4th pressure sensor 23;
The P mouth of pilot operated handle 1, the oil-in of the first overflow valve 7 all connect the oil-out of pioneer pump 8, the T mouth of the oil-out of the first overflow valve 7 and pilot operated handle 1 is connected fuel tank, and described motor 10 is electrical connected by electric machine controller 5 and electric weight storage element 4;
Described pilot operated handle 1 is connected with banked direction control valves 16, described pilot operated handle 1 is connected to assembly controller 25 by the first pressure sensor 2 and the second pressure sensor 3 respectively, described hydraulic accumulator 19 is connected with described assembly controller 25 by the 5th pressure sensor 15 by the 4th pressure sensor 23, described quantitative pump/motor 9 by the 3rd pressure sensor 20, described shuttle valve 21, and described assembly controller 25 is also connected with electric machine controller 5, the first solenoid operated directional valve 11, the first solenoid operated directional valve 12, the first solenoid operated directional valve 24 respectively.
Described banked direction control valves 16 is the banked direction control valves of controlled brake arm, dipper, scraper bowl, turntable and left and right walking; Described pilot operated handle 1 is the pilot operated handle of controlled brake arm, dipper, scraper bowl, turntable and left and right walking.
By the first pressure sensor 2, the second pressure sensor 3, the three pressure sensors 20, the 4th pressure sensor 23 and the 5th pressure sensor 15, detect respectively and obtain pilot pressure signal p
i1, p
i2, hydraulic accumulator 19 pressure p
i3, load maximum pressure p
i4and the outlet pressure p of quantitative pump/motor 9
i5, and as the input signal of assembly controller 25.Assembly controller 25 produces the control signal C1 of electric machine controller 5, the control signal C3 of the control signal C2 of the first solenoid operated directional valve 11, the second solenoid operated directional valve 12 and the control signal C4 of the 3rd solenoid operated directional valve 24 according to input signal.
The invention still further relates to a kind of auto idle speed method of electric liquid combination drive engineering machinery, carry out successively following steps:
Step (1), setting dead time are that Tc, pilot pressure threshold value are p
ic, hydraulic accumulator pressure judgment threshold △ pc, hydraulic accumulator pressure bound p
1min, p
1max;
Step (2), detection pilot handle pressure signal p
i1, p
i2judge whether to enter auto idle speed pattern:
Pilot force signal p in the ban
i1, p
i2all be less than pilot pressure threshold value p
ictime, decision-making system has stopped action, enters step (3); Otherwise system enters mode of operation, judge auto idle speed mode failures even and exit auto idle speed control program, enter step (7);
Step (3), when dead time Tc that system off-air time t surpass to set, enter step (4), otherwise exit auto idle speed control program;
Step (4), detection hydraulic accumulator 19 force value p
i3with load maximum value p
i4:
Force value p when hydraulic accumulator 19
i3with load maximum value p
i4difference meet: p
i3-p
i4during > △ pc, the first solenoid operated directional valve 11 obtains electric, the second solenoid operated directional valve 12 and the 3rd solenoid operated directional valve 21 dead electricity; The hydraulic oil of hydraulic accumulator 19, by the first solenoid operated directional valve 11, be discharged into the oil-in of quantitative pump/motor 9, quantitatively pump/motor 9 is operated in motoring mode, drive motor 10 is operated in power generation mode, the hydraulic energy of hydraulic accumulator 19 is converted to electrical power storage in electric weight storage element 4, and now the pressure of hydraulic accumulator declines gradually; Due to now quantitatively the whole hydraulic oil of outlet of pump/motor 9 all pass through banked direction control valves 16 Road oil return opening D, the rear oil sump tank of the 3rd solenoid operated directional valve 24, the rotating speed of target of motor 10 need not be considered the characteristic of load, therefore can at the most effective point of power generation mode, set according to motor 10; Otherwise, when the pressure p of hydraulic accumulator 19
i3with load maximum pressure p
i4difference meet: p
i3-p
i4during <-△ pc, enter step (5) and meet :-△ pc≤p
i3-p
i4during≤△ pc, enter step (6);
Step (5), when the pressure p of hydraulic accumulator 19
i3with load maximum pressure p
i4difference meet: p
i3-p
i4during <-△ pc, the first solenoid operated directional valve 11 dead electricity, the second solenoid operated directional valve 12 and the 3rd solenoid operated directional valve 24 obtain electric, motor 10 is operated in electric model, quantitatively pump/motor 9 is operated in pump pattern, between banked direction control valves 16 Road oil return opening D and fuel tank, by the 3rd solenoid operated directional valve 24, disconnect, the hydraulic oil of all quantitative pump/motors 9 enters hydraulic accumulator 19 by the second solenoid operated directional valve 12, and the pressure of hydraulic accumulator 19 raises; The rotating speed of target of motor 10 need not be considered the characteristic of load, so the rotating speed of target of motor 10 is according to most effective work of electric model,
Step (6), when the pressure p of hydraulic accumulator 19
i3with load maximum pressure p
i4difference meet :-△ pc≤p
i3-p
i4during≤△ pc, the first solenoid operated directional valve 11, the second solenoid operated directional valve 12 and the equal dead electricity of the 3rd solenoid operated directional valve 24; Motor 10 work electric models, the rotating speed of target of motor 10 is set according to the minimum speed of motor 10, quantitative pump/motor 9 and pioneer pump 8, and quantitatively the hydraulic oil of pump/motor 9 is by banked direction control valves 16 Road oil return opening D, the rear oil sump tank of the 3rd solenoid operated directional valve 24, now quantitatively flow and the pressure of pump/motor 9 are all less, realize off-load, reduced the meta throttling loss of system;
Step (7), system enter mode of operation, detect quantitative pump/motor outlet pressure p
i5:
The 3rd solenoid operated directional valve 24 dead electricity, motor 10 is operated in electric model, and rotating speed of target is according to pilot pressure signal p
i1, p
i2size calculate to obtain:
Account form is as follows:
1) according to pilot pressure signal p
i1, p
i2, pilot pressure maximum value p
imax, pilot pressure threshold value is p
icand the design maximum rating v that drives oil cylinder
maxcalculate the target velocity v that drives oil cylinder
c:
Work as p
i1be greater than p
ictime, hypothesis driven oil cylinder stretches out, v
c=(p
i1-p
ic)/(p
imax-p
ic) * v
max;
Work as p
i2be greater than p
ictime, hypothesis driven oil cylinder is retracted, v
c=(p
i2-p
ic)/(p
imax-p
ic) * v
max;
2) according to the rodless cavity diameter D and the diameter of piston rod d that drive oil cylinder, the target flow Q of calculation in quantity pump/motor
pc:
Work as p
i1be greater than p
ictime, hypothesis driven oil cylinder stretches out,
Work as p
i2be greater than p
ictime, hypothesis driven You Gang Shrink returns,
Other time, Q
pc=0;
3) according to the discharge capacity q of quantitative pump/motor, calculate the rotating speed of target n of dynamoelectric machine
c:
The first solenoid operated directional valve 11 whether electric judgment rule is: when the pressure p of hydraulic accumulator 19
i3be greater than hydraulic accumulator low pressure limit p
1mintime, i.e. p
1min< p
i3time, the first solenoid operated directional valve 11 obtains electric, and the hydraulic oil of hydraulic accumulator 19 is discharged into the oil-in of quantitative pump/motor 9 by the first solenoid operated directional valve 11, improve the inlet pressure of quantitative pump/motor 9, actuating motor 10 fast not only, also can reduce the operation torque of motor 10; Otherwise, the first solenoid operated directional valve 11 dead electricity;
The second solenoid operated directional valve 12 whether electric judgment rule is: as the outlet pressure p of quantitative pump/motor
i5be less than load maximum pressure p
i4time, i.e. p
i5< p
i4time, the second solenoid operated directional valve 12 obtains electric, and the pressure oil of hydraulic accumulator 19 is discharged into the oil-out of quantitative pump/motor 9 by the second solenoid operated directional valve 12, and in order to Rapid Establishment, rise and overcome the required pressure of load, otherwise, work as p
i5>=p
i4time, now the oil-out of quantitative hydraulic pump/motor 9 has been set up and has been overcome the required pressure of load, the second solenoid operated directional valve 12 dead electricity, by quantitative pump/motor 9 separately to banked direction control valves 16 fuel feeding, avoided due to hydraulic accumulator 19 and the constant pressure source that quantitatively pump/motor 9 forms in load hour, on banked direction control valves 16, produce larger pressure reduction loss.
The present invention considers in electric liquid combination drive hydraulic crawler excavator, because motor replaces after Engine driven Hydraulic Pump, the relative motor of motor has the wide feature of the range of speeds, therefore when auto idle speed, quantitatively the minimum speed of pump/motor can be set in the minimum speed in the working range of a hydraulic pump and motor, realize prexxure of the hydraulic pump and flow off-load, can reduce the meta throttling loss of hydraulic system.
During idling operation, when the pressure of accumulator is less than load maximum pressure, constant displacement pump/motor operations is in pump pattern, oil-filled to hydraulic accumulator, for next cycle, to set up the required pressure of load ready, when system works, the hydraulic oil of hydraulic accumulator can be discharged into the outlet of quantitative pump/motor, is used for Rapid Establishment to rise and overcome the required pressure of load.This auto idle speed method has the feature of the self-adapting load pressure of energy storage pressure, overcomes traditional excavator when auto idle speed is cancelled, if the outlet of quantitative pump/motor is difficult to Rapid Establishment and rises and overcome the required pressure of load when engine start machine rotating speed is lower;
During idling operation, when the pressure of accumulator is higher, constant displacement pump/motor operations is in motoring mode, the hydraulic oil of hydraulic accumulator can discharge, drive quantitative pump/motor and dynamoelectric machine, become electrical power storage in electric weight storage element the power conversion of hydraulic accumulator, for next cycling, prepare, extended the working time of electric weight storage element.
Although more than described the specific embodiment of the present invention; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; rather than for the restriction to scope of the present invention; those of ordinary skill in the art are in equivalent modification and the variation done according to spirit of the present invention, all should be encompassed in the scope that claim of the present invention protects.
Claims (2)
1. the auto idle speed system of an electric liquid combination drive engineering machinery, it is characterized in that: described auto idle speed system comprises pilot operated handle, the first pressure sensor, the second pressure sensor device, electric weight storage element, electric machine controller, the first one way valve, the first overflow valve, pioneer pump, quantitative pump/motor, motor, the first solenoid operated directional valve, the second solenoid operated directional valve, the second overflow valve, the second one way valve, the 5th pressure sensor, banked direction control valves, energy recovery unit, the 3rd overflow valve, hydraulic accumulator, the 3rd pressure sensor, shuttle valve, drive oil cylinder, the 4th pressure sensor, the 3rd solenoid operated directional valve, assembly controller,
Wherein, described motor, pioneer pump and quantitative pump/motor are connected with shaft mechanical; The outlet of described quantitative pump/motor connects the oil-in of the second one way valve; The A mouth of the oil-in of the second overflow valve, the second solenoid operated directional valve, the P mouth of banked direction control valves is connected with the oil-out of P1 mouth all with the second one way valve, the oil-out connected tank of the second overflow valve, the T mouth connected tank of banked direction control valves, the A mouth of banked direction control valves connects the rodless cavity that drives oil cylinder, the B mouth of banked direction control valves connects the rod chamber that drives oil cylinder, and the D mouth of banked direction control valves connects the A mouth of the 3rd solenoid operated directional valve, and the B mouth of the 3rd solenoid operated directional valve connects fuel tank;
The B mouth of the second solenoid operated directional valve, the A mouth of the first solenoid operated directional valve, the oil-in of the 3rd overflow valve, the 3rd pressure sensor and energy recovery unit are all connected to the hydraulic fluid port of hydraulic accumulator, the oil-out connected tank of the 3rd overflow valve;
The B mouth of the first solenoid operated directional valve, the oil-out of the first one way valve is connected to the oil-in of quantitative pump/motor, the oil-in connected tank of the first one way valve; Drive the rod chamber of oil cylinder to be connected with two oil-ins of shuttle valve respectively with rodless cavity, the oil-out of shuttle valve connects the 4th pressure sensor;
The P mouth of pilot operated handle, the oil-in of the first overflow valve all connect the oil-out of pioneer pump, and the T mouth of the oil-out of the first overflow valve and pilot operated handle is connected fuel tank, and described motor is electrical connected by electric machine controller and electric weight storage element;
Described pilot operated handle is connected with banked direction control valves, described pilot operated handle is connected to assembly controller by the first pressure sensor and the second pressure sensor respectively, described hydraulic accumulator is connected with described assembly controller by the 5th pressure sensor by the 4th pressure sensor, described quantitative pump/motor by the 3rd pressure sensor, described shuttle valve, and described assembly controller is also connected with electric machine controller, the first solenoid operated directional valve, the first solenoid operated directional valve, the first solenoid operated directional valve respectively.
2. an auto idle speed method for electric liquid combination drive engineering machinery, is characterized in that: comprise the following steps:
Step (1), setting dead time are that Tc, pilot pressure threshold value are p
ic, hydraulic accumulator pressure judgment threshold △ pc, hydraulic accumulator pressure bound p
1min, p
1max;
Step (2), detection pilot handle pressure signal p
i1, p
i2judge whether to enter auto idle speed pattern:
Pilot force signal p in the ban
i1, p
i2all be less than pilot pressure threshold value p
ictime, decision-making system has stopped action, enters step (3); Otherwise system enters mode of operation, judge auto idle speed mode failures even and exit auto idle speed control program, enter step (7);
Step (3), when dead time Tc that system off-air time t surpass to set, enter step (4), otherwise exit auto idle speed control program;
Step (4), detection hydraulic accumulator force value p
i3with load maximum value p
i4:
Force value p when hydraulic accumulator
i3with load maximum value p
i4difference meet: p
i3-p
i4during > △ pc, the hydraulic oil of hydraulic accumulator, be discharged into the oil-in of quantitative pump/motor, constant displacement pump/motor operations is in motoring mode, drive motor is operated in power generation mode, the hydraulic energy of hydraulic accumulator is converted to electrical power storage in electric weight storage element, and the rotating speed of target of motor is set at the most effective point of power generation mode according to motor; Otherwise, when the pressure p of hydraulic accumulator
i3with load maximum pressure p
i4difference meet: p
i3-p
i4during <-△ pc, enter step (5); When meeting :-△ pc≤p
i3-p
i4during≤△ pc, enter step (6);
Step (5), when the pressure p of hydraulic accumulator
i3with load maximum pressure p
i4difference meet: p
i3-p
i4during <-△ pc, motor is operated in electric model, and constant displacement pump/motor operations is in pump pattern, the hydraulic oil of all quantitative pump/motors enters hydraulic accumulator, hydraulic accumulator is carried out oil-filled, the rotating speed of target of motor is according to most effective work of electric model
Step (6), when the pressure p of hydraulic accumulator
i3with load maximum pressure p
i4difference meet :-△ pc≤p
i3-p
i4during≤△ pc, motor is operated in electric model, and the rotating speed of target of motor is set by minimum speed, and quantitatively the hydraulic oil of pump/motor passes through the Road oil return opening D oil sump tank of banked direction control valves,
Realize off-load;
Step (7), system enter mode of operation, detect quantitative pump/motor outlet pressure p
i5:
Motor is operated in electric model, and rotating speed of target is according to pilot pressure signal p
i1, p
i2calculate and obtain; Pressure p when hydraulic accumulator
i3be greater than hydraulic accumulator low pressure limit p
1mintime, the hydraulic oil of hydraulic accumulator is discharged into the oil-in of quantitative pump/motor, improves the inlet pressure of quantitative pump/motor; Outlet pressure p when quantitative pump/motor
i5be less than load maximum pressure p
i4time, the logical oil-out that is discharged into quantitative pump/motor of pressure oil of hydraulic accumulator, rises and overcomes the required pressure of load in order to Rapid Establishment.
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| CN105179383A (en) * | 2015-09-28 | 2015-12-23 | 北汽福田汽车股份有限公司 | Engineering machinery, hydraulic system for constant displacement pump of engineering machinery and controlling method of hydraulic system |
| CN106049593A (en) * | 2016-08-01 | 2016-10-26 | 华侨大学 | Automatic idling system based on multiple hydraulic accumulators and control method |
| CN107630815A (en) * | 2017-08-15 | 2018-01-26 | 太原理工大学 | The air compressor machine of combination drive |
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| CN112249985A (en) * | 2020-11-10 | 2021-01-22 | 厦门国重新能工程机械有限公司 | Potential energy recycling system of combined electric forklift |
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| CN113338384B (en) * | 2021-05-27 | 2023-03-10 | 三一重机有限公司 | Electrically driven positive flow hydraulic control system, method and work machine |
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