CN103924627B - A kind of auto idle speed system and method for electric liquid combination drive engineering machinery - Google Patents
A kind of auto idle speed system and method for electric liquid combination drive engineering machinery Download PDFInfo
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- CN103924627B CN103924627B CN201410151812.6A CN201410151812A CN103924627B CN 103924627 B CN103924627 B CN 103924627B CN 201410151812 A CN201410151812 A CN 201410151812A CN 103924627 B CN103924627 B CN 103924627B
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Abstract
The invention provides a kind of auto idle speed system and method for electric liquid combination drive engineering machinery, step is as follows: 1) set dead time, pilot pressure threshold value, hydraulic accumulator pressure judgment threshold etc.; 2) detect pilot handle pressure signal to judge whether to enter auto idle speed pattern; 3) when the system stalls time exceedes dead time, next step is entered; 4) enter step 5) when the pressure of hydraulic accumulator and load maximum pressure difference are less than negative pressure judgment threshold, otherwise then enter step 6); 5) motor is operated in electric model, and constant displacement pump/motor operations is in pump pattern; 6) motor is operated in electric model, and quantitatively the hydraulic oil of pump/motor passes through banked direction control valves off-load; 7) enter mode of operation, detect constant displacement pump/motor outlet pressure.The present invention can solve hydraulic pump outlet when auto idle speed is cancelled and be difficult to set up the problem overcoming pressure needed for load fast, and can become electric energy at auto idle speed patten transformation by the hydraulic energy of energy regenerating.
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 the engineering machinery with 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 research 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 realizes energy conservation, reduces 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 for hydraulic crawler excavator, after operating grip stops action 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 engine speed to the second auto idle speed again, in whole auto idle speed running, if operating grip leaves meta, then adjust the rotating speed of target corresponding to motor to throttle at once.Engineering machinery auto idle speed pattern effectively can 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 pressure needed for load is larger, because the rotation speed dynamics of motor is poor, hydraulic pump outlet must be caused to be difficult to set up the pressure overcome needed for load fast, so the rotating speed of general auto idle speed can not be too low, thus it is still larger by the rate of discharge of hydraulic pump 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 reduces, 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 under the prerequisite meeting condition of work, the power output of motor is suitably provided, then can improves engine efficiency, then can save fuel oil further.
[summary of the invention]
One of the technical problem to be solved in the present invention, be the auto idle speed system that a kind of electric liquid combination drive engineering machinery is provided, not only effectively solve hydraulic pump outlet when auto idle speed is cancelled and be difficult to the problem setting up load pressure fast, simultaneously due to electric energy can be become at auto idle speed patten transformation, for subsequent work is ready by the hydraulic energy of energy regenerating (turntable braking is transferred with mechanical arm).
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, first pressure sensor, second pressure sensor device, electricity storage element, electric machine controller, first one way valve, first overflow valve, pioneer pump, quantitative pump/motor, motor, first solenoid operated directional valve, second solenoid operated directional valve, second overflow valve, second one way valve, 5th pressure sensor, banked direction control valves, energy recovery unit, 3rd overflow valve, hydraulic accumulator, 3rd pressure sensor, shuttle valve, drive oil cylinder, 4th pressure sensor, 3rd solenoid operated directional valve, assembly controller,
Wherein, described motor, pioneer pump and constant displacement pump/motors mechanical communication; The outlet of described quantitative pump/motor connects the oil-in of the second one way valve; The oil-in of the second overflow valve, the A mouth of 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 driving oil cylinder, the B mouth of banked direction control valves connects the rod chamber driving 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 oil-out of the first overflow valve is connected fuel tank with the T mouth of pilot operated handle, and described motor is electrical connected by electric machine controller and electricity storage element;
Described pilot operated handle is connected with banked direction control valves, described pilot operated handle is connected to assembly controller respectively by the first pressure sensor and the second pressure sensor, 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.
The technical problem to be solved in the present invention two, be a kind of auto idle speed method that electric liquid combination drive engineering machinery is provided, not only effectively solve hydraulic pump outlet when auto idle speed is cancelled and be difficult to the problem setting up load pressure fast, simultaneously due to electric energy can be become at auto idle speed patten transformation, for subsequent work is ready by the hydraulic energy of energy regenerating (turntable braking is transferred with mechanical arm).
The present invention realizes above-mentioned technical problem two like this:
An auto idle speed method for electric liquid combination drive engineering machinery, comprises the following steps:
Step (1), setting dead time are Tc, pilot pressure threshold value is 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:
As pilot pressure signal p
i1, p
i2all be less than pilot pressure threshold value p
ictime, decision-making system stops action, enters step (3); Otherwise system enters mode of operation, judge auto idle speed mode failures even and exit auto idle speed control program, entering step (7);
Step (3), when system stalls time t exceedes the dead time Tc of setting, enter step (4), otherwise exit auto idle speed control program;
Step (4), detection hydraulic accumulator force value p
i3with load maximum value p
i4:
As the force value p of 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 electricity storage element, and the rotating speed of target of motor sets according to the most effective point of motor at power generation mode; Otherwise, when the pressure p of hydraulic accumulator
i3with load maximum pressure p
i4difference meet: p
i3-p
i4step (5) is entered during <-△ pc; When meeting :-△ pc≤p
i3-p
i4step (6) is entered during≤△ pc;
Step (5), pressure p when 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, carry out oil-filled to hydraulic accumulator, the rotating speed of target of motor is according to most effective work of electric model
Step (6), pressure p when 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 sets by minimum speed, and quantitatively the hydraulic oil of pump/motor, by 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 constant displacement 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 obtain; When the pressure p of 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; As the outlet pressure p of quantitative pump/motor
i5be less than load maximum pressure p
i4time, the pressure oil of hydraulic accumulator leads to the oil-out being discharged into quantitative pump/motor, overcomes pressure needed for load in order to set up fast.
Tool of the present invention has the following advantages:
(1) consider in electric liquid combination drive hydraulic crawler excavator, after motor replacement Engine driven Hydraulic Pump, motor opposite engine has the wide feature of the range of speeds, therefore when auto idle speed, the minimum speed of quantitative 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, the meta throttling loss of hydraulic system can be reduced.
(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 pressure needed for load ready, when system works, the hydraulic oil of hydraulic accumulator can be discharged into the outlet of quantitative pump/motor, is used for setting up fast overcoming pressure needed for load.This auto idle speed method has the feature of the self-adapting load pressure of energy storage pressure, overcomes conventional excavators when auto idle speed is cancelled, if constant displacement pump/motor outlet is difficult to set up the pressure overcome needed for load fast 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 electricity storage element the power conversion of hydraulic accumulator, for next cycling is prepared, extend the working time of electricity 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, first pressure sensor
3, the second pressure sensor 4, electricity storage element
5, electric machine controller 6, 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, second solenoid operated directional valve
13, the second overflow valve 14, 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
[detailed description of the invention]
Refer to shown in Fig. 1, embodiments of the invention are described in detail.
Emphasis consults 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, first pressure sensor 2, second pressure sensor device 3, electricity storage element 4, electric machine controller 5, first one way valve 6, first overflow valve 7, pioneer pump 8, quantitative pump/motor 9, motor 10, first solenoid operated directional valve 11, second solenoid operated directional valve 12, second overflow valve 13, second one way valve 14, 5th pressure sensor 15, banked direction control valves 16, energy recovery unit 17, 3rd overflow valve 18, hydraulic accumulator 19, 3rd pressure sensor 20, shuttle valve 21, drive oil cylinder 22, 4th pressure sensor 23, 3rd solenoid operated directional valve 24, assembly controller 25,
Wherein, described motor 10, pioneer pump 8 and the coaxial mechanical communication of quantitative pump/motor 9; The outlet of described quantitative pump/motor 9 connects the oil-in of the second one way valve 14; The oil-in of the second overflow valve 13, the A mouth of 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 driving oil cylinder 22, the B mouth of banked direction control valves 16 connects the rod chamber driving 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 B mouth of the second solenoid operated directional valve 12, the A mouth of 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 oil-out of the first overflow valve 7 is connected fuel tank with the T mouth of pilot operated handle 1, and described motor 10 is electrical connected by electric machine controller 5 and electricity 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 respectively by the first pressure sensor 2 and the second pressure sensor 3, 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, first solenoid operated directional valve 11, first solenoid operated directional valve 12, first solenoid operated directional valve 24 respectively.
Described banked direction control valves 16 is the banked direction control valves walked in controlled brake arm, dipper, scraper bowl, turntable and left and right; Described pilot operated handle 1 is the pilot operated handle walked in controlled brake arm, dipper, scraper bowl, turntable and left and right.
Detected respectively by the first pressure sensor 2, second pressure sensor the 3, three pressure sensor 20, the 4th pressure sensor 23 and the 5th pressure sensor 15 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 C4 of control signal C1, the control signal C2 of the first solenoid operated directional valve 11 of electric machine controller 5, the control signal C3 of the second solenoid operated directional valve 12 and 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 following steps successively:
Step (1), setting dead time are Tc, pilot pressure threshold value is 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:
As pilot pressure signal p
i1, p
i2all be less than pilot pressure threshold value p
ictime, decision-making system stops action, enters step (3); Otherwise system enters mode of operation, judge auto idle speed mode failures even and exit auto idle speed control program, entering step (7);
Step (3), when system stalls time t exceedes the dead time Tc of setting, 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:
As the force value p of 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, quantitative 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 electricity 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 Road oil return opening D, the 3rd solenoid operated directional valve 24 oil sump tank afterwards of banked direction control valves 16, the rotating speed of target of motor 10 need not consider the characteristic of load, therefore can set according to the most effective point of motor 10 at power generation mode; Otherwise, when the pressure p of hydraulic accumulator 19
i3with load maximum pressure p
i4difference meet: p
i3-p
i4enter step (5) during <-△ pc and meet :-△ pc≤p
i3-p
i4step (6) is entered during≤△ pc;
Step (5), pressure p when hydraulic accumulator 19
i3with load maximum pressure p
i4difference meet: p
i3-p
i4during <-△ pc, first solenoid operated directional valve 11 dead electricity, second solenoid operated directional valve 12 and the 3rd solenoid operated directional valve 24 obtain electric, motor 10 is operated in electric model, quantitative pump/motor 9 is operated in pump pattern, disconnected by the 3rd solenoid operated directional valve 24 between the Road oil return opening D of banked direction control valves 16 and fuel tank, 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 consider the characteristic of load, and therefore the rotating speed of target of motor 10 is according to most effective work of electric model,
Step (6), pressure p when hydraulic accumulator 19
i3with load maximum pressure p
i4difference meet :-△ pc≤p
i3-p
i4during≤△ pc, the first solenoid operated directional valve 11, second solenoid operated directional valve 12 and the 3rd solenoid operated directional valve 24 all dead electricity; Motor 10 works electric model, the rotating speed of target of motor 10 sets according to motor 10, the quantitatively minimum speed of pump/motor 9 and pioneer pump 8, and quantitatively the hydraulic oil of pump/motor 9 passes through Road oil return opening D, the rear oil sump tank of the 3rd solenoid operated directional valve 24 of banked direction control valves 16, now quantitatively the flow of pump/motor 9 and pressure all less, realize off-load, reduce the meta throttling loss of system;
Step (7), system enter mode of operation, detect constant displacement pump/motor outlet pressure p
i5:
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 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 drive the design maximum rating v of oil cylinder
maxcalculate the target velocity v driving 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 diameter of piston rod d, the target flow Q of calculation in quantity pump/motor that drive oil cylinder
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) the rotating speed of target n of dynamoelectric machine is calculated according to the discharge capacity q of quantitative pump/motor
c:
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, 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, not only can actuating motor 10 fast, also can reduce the operation torque of motor 10; Otherwise, the first solenoid operated directional valve 11 dead electricity;
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, overcome pressure needed for load in order to set up fast, 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 pressure needed for load, second solenoid operated directional valve 12 dead electricity, by quantitative pump/motor 9 separately to banked direction control valves 16 fuel feeding, avoid the constant pressure source that forms due to hydraulic accumulator 19 and quantitative pump/motor 9 when load is less, banked direction control valves 16 produces larger pressure reduction loss.
The present invention considers in electric liquid combination drive hydraulic crawler excavator, after motor replacement Engine driven Hydraulic Pump, motor opposite engine has the wide feature of the range of speeds, therefore when auto idle speed, the minimum speed of quantitative 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, the meta throttling loss of hydraulic system can be reduced.
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 pressure needed for load ready, when system works, the hydraulic oil of hydraulic accumulator can be discharged into the outlet of quantitative pump/motor, is used for setting up fast overcoming pressure needed for load.This auto idle speed method has the feature of the self-adapting load pressure of energy storage pressure, overcomes conventional excavators when auto idle speed is cancelled, if constant displacement pump/motor outlet is difficult to set up the pressure overcome needed for load fast 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 electricity storage element the power conversion of hydraulic accumulator, for next cycling is prepared, extend the working time of electricity storage element.
Although the foregoing describe the specific embodiment of the present invention; but be familiar with those skilled in the art to be to be understood that; specific embodiment described by us is illustrative; instead of for the restriction to scope of the present invention; those of ordinary skill in the art, in the modification of the equivalence done according to spirit of the present invention and change, should be encompassed in 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, first pressure sensor, second pressure sensor, electricity storage element, electric machine controller, first one way valve, first overflow valve, pioneer pump, quantitative pump/motor, motor, first solenoid operated directional valve, second solenoid operated directional valve, second overflow valve, second one way valve, 5th pressure sensor, banked direction control valves, energy recovery unit, 3rd overflow valve, hydraulic accumulator, 3rd pressure sensor, shuttle valve, drive oil cylinder, 4th pressure sensor, 3rd solenoid operated directional valve, assembly controller,
Wherein, described motor, pioneer pump and constant displacement pump/motors mechanical communication; The outlet of described quantitative pump/motor connects the oil-in of the second one way valve; The oil-in of the second overflow valve, the A mouth of 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 driving oil cylinder, the B mouth of banked direction control valves connects the rod chamber driving 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 oil-out of the first overflow valve is connected fuel tank with the T mouth of pilot operated handle, and described motor is electrical connected by electric machine controller and electricity storage element;
Described pilot operated handle is connected with banked direction control valves, described pilot operated handle is connected to assembly controller respectively by the first pressure sensor and the second pressure sensor, 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 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 Tc, pilot pressure threshold value is p
ic, hydraulic accumulator pressure judgment threshold △ pc, hydraulic accumulator pressure bound p
1min, p
1max;
Step (2), detection pilot pressure signal p
i1, p
i2judge whether to enter auto idle speed pattern:
As pilot pressure signal p
i1, p
i2all be less than pilot pressure threshold value p
ictime, decision-making system stops action, enters step (3); Otherwise system enters mode of operation, judge auto idle speed mode failures even and exit auto idle speed control program, entering step (7);
Step (3), when system stalls time t exceedes the dead time Tc of setting, enter step (4), otherwise exit auto idle speed control program;
Step (4), detection hydraulic accumulator force value p
i3with load maximum value p
i4:
As the force value p of 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 electricity storage element, and the rotating speed of target of motor sets according to the most effective point of motor at power generation mode; Otherwise, when the pressure p of hydraulic accumulator
i3with load maximum pressure p
i4difference meet: p
i3-p
i4step (5) is entered during <-△ pc; When meeting :-△ pc≤p
i3-p
i4step (6) is entered during≤△ pc;
Step (5), pressure p when 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, carry out oil-filled to hydraulic accumulator, the rotating speed of target of motor is according to most effective work of electric model
Step (6), pressure p when 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 sets by minimum speed, and quantitatively the hydraulic oil of pump/motor, by 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 constant displacement 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; When the pressure p of 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; As the outlet pressure p of quantitative pump/motor
i5be less than load maximum pressure p
i4time, the pressure oil of hydraulic accumulator leads to the oil-out being discharged into quantitative pump/motor, overcomes pressure needed for load in order to set up fast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410151812.6A CN103924627B (en) | 2014-04-15 | 2014-04-15 | A kind of auto idle speed system and method for electric liquid combination drive engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410151812.6A CN103924627B (en) | 2014-04-15 | 2014-04-15 | A kind of auto idle speed system and method for electric liquid combination drive engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103924627A CN103924627A (en) | 2014-07-16 |
| CN103924627B true CN103924627B (en) | 2016-02-24 |
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| CN104358284B (en) * | 2014-10-29 | 2016-10-05 | 华侨大学 | A kind of electro-hydraulic hybrid drive system of hydraulic excavating machine oil |
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| CN106049593B (en) * | 2016-08-01 | 2018-08-10 | 华侨大学 | A kind of auto idle speed system and control method based on more hydraulic accumulators |
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| CN109811823B (en) * | 2019-03-19 | 2024-04-16 | 徐州徐工挖掘机械有限公司 | Idle speed energy-saving control system and control method for excavator |
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| JP7201836B2 (en) * | 2019-09-25 | 2023-01-10 | 株式会社日立建機ティエラ | construction machinery |
| CN112682373B (en) * | 2020-12-29 | 2023-03-21 | 山推工程机械股份有限公司 | Hydraulic system, control method and engineering vehicle |
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