CN104612951B - A kind of reciprocating compressor stepless tolerance regulating method and system - Google Patents
A kind of reciprocating compressor stepless tolerance regulating method and system Download PDFInfo
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- CN104612951B CN104612951B CN201510015385.3A CN201510015385A CN104612951B CN 104612951 B CN104612951 B CN 104612951B CN 201510015385 A CN201510015385 A CN 201510015385A CN 104612951 B CN104612951 B CN 104612951B
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Abstract
The present invention relates to a kind of the reciprocating compressor stepless tolerance regulating method and the system that adopt flexible time control mode, for controlling reciprocating compressor air displacement, adapting to enterprise's different rotating speeds reciprocating compressor need of production; This stepless amount regulating system comprises hydraulic power system, hydraulic actuator, air valve relief arrangement, tolerance regulation and control system, Signal Measurement System and supporting sealing mechanism; First concrete control need obtain each constituent element time parameter of stepless amount regulating system, determines concrete time controling mode and the control signal way of output according to different parameters; The present invention can carry out accurately the reciprocating flow air displacement of all kinds of different rotating speeds, the adjustment of wide range, and energy consumption reduces with the minimizing of air displacement.
Description
Technical field
The present invention relates to a kind of piston type reciprocating compressor air volume regulating device and different control methods, achieve the electrodeless adjustment of reciprocating compressor tolerance of larger operating rotational speed range, reach energy-saving and cost-reducing object.
Background technique
Reciprocting piston compressor is a kind of gas transportation facilities, being widely used in the industrial fields such as national defence, metallurgy, chemical industry, oil refining, machinery and daily life, is each department especially one of requisite key equipment in the process industry such as petrochemical industry of national economy.Volume flow under a specific reciprocating compressor normal working remains unchanged substantially, but because the change of the market demand, the change etc. of conditions of manufacture make required reciprocating compressor actual exhaust air amount existence variation in a big way in actual production, therefore need to carry out the adjustment of reciprocating compressor air displacement to adapt to the change demand of actual tolerance.Current existing tolerance regulating method have pipeline regulate method, clearance volume regulate method, rotational speed regulation method, pressing-off suction valve regulate method, can realize to a certain extent tolerance regulate.But pipeline regulates method and clearance volume to regulate the energy of method waste very high, and degree of regulation is not high yet; The rotational speed regulation of rotational speed regulation method is limited in scope, and can not realize 0-100% all-range step-less adjustment; The method of being carried out Flow-rate adjustment by pressing-off suction valve is obviously caused great concern because of energy-saving effect, is a kind of regulative mode that application is more at present.
Current pressing-off suction valve tolerance regulating method, it comprises partial journey pressing-off suction valve and total travel pressing-off suction valve.The adjustment of total travel pressing-off suction valve, in whole exhaust stroke, Aspirating valves is forced to press off all the time.Traditional pressing-off suction valve regulating method, by controlling the multiple cylinder of reciprocating compressor, reaches and regulates tolerance object, realizes tolerance and regulates, but regulation range and precision lower, can only 0% be reached, 25%, 50%, 75%, 100%.A kind of air displacement stepless regulating method for reciprocating-piston compressor (patent CN101173658B) of Xi'an Communications University's invention, on the basis of total travel pressing-off suction valve, changes into Duty ratio control by the switch control rule of pressing-off suction valve.Be a control cycle with 100 working cells, control air displacement by the unit number of controlled loading and the ratio of unloaded unit number.
Another kind method is the adjustment of partial journey pressing-off suction valve, the method controls Aspirating valves by specific device and presses off and closedown in a reciprocating compressor work cycle, a part of gas is allowed to be back to air-inlet cavity in compression process, reach the object controlling air displacement to a certain extent, simultaneously because unnecessary gas does not carry out compressing thus reduce power consumption while minimizing air displacement.Partial journey pressing-off suction valve regulated and carry out tolerance adjustment in each operation cycle of compressor, realized the fine adjustment of 0-100% all-range tolerance.The design of what this regulative mode was the most key is actuator, as electrohydraulic control technology disclosed in patent EP-A-0893605 drives the pressure of straight line motion fork to be pressed off by Aspirating valves, air displacement can be adjusted to 10%; Patent US-A-5695325 is rotated between air valve and valve seat by specific device, realizes Aspirating valves open and close; The amount regulating system of Zhejiang University's machine Research Institute, rely on pressure distributor and adjustable reflux valve, air displacement can be adjusted to 50%; What applied in a big way at present is the stepless amount regulating system of HydroCOM (Chinese patent CN03158561.2) that Austrian He Erbige company researches and develops.
In addition, the variation pattern that a kind of partial journey regulates is proposed in patent CN103233884A, by the tolerance value of partial journey in adjustment loading cycle number, duty cycle number and one-period in some cycles, the overall tolerance realizing a control cycle is the tolerance needing to reach.
Summary of the invention
The present invention is based on and back down the basic principle that suction valve regulates tolerance, a kind of reciprocating compressor stepless tolerance regulating method and system adopting flexible time control mode, 0 ~ 100% all-range step-less adjustment of wider operating rotational speed range compressor tolerance can be realized, applied widely, good energy-conserving effect.
Adopt a reciprocating compressor stepless tolerance regulating method for flexible time control mode, it is characterized in that, be applied to following system:
This system comprises hydraulic power system, hydraulic actuator, air valve relief arrangement, tolerance regulation and control system, Signal Measurement System and supporting sealing mechanism;
Hydraulic power system comprises fuel reserve tank, motor, hydraulic-pressure pump, accumulator, pressure gauge, level meter, pressure-control relay, safety valve, unloading valve and pressure line; Hydraulic actuator is hydraulic jack, comprises plunger and seal element in oil cylinder; Air valve relief arrangement carries unloader by Aspirating valves and forms, and unloader push rod contacts with Cylinder Plunger; Tolerance regulation and control system comprises solenoid directional control valve, programmable logic controller (PLC), solid-state relay and coherent signal cable; Signal Measurement System comprises current vortex sensor and key phase acquisition system;
The method comprises the steps:
Tolerance regulates setup parameter to be K, K=0 ~ 1, represents the ratio that on-the-spot reciprocating compressor actual demand air displacement accounts for rated discharge amount;
Determine the response time parameter of hydraulic actuator, comprising: solenoid directional control valve unlatching control signal outputs to hydraulic actuator and completes the time T ejecting action
1, hydraulic actuator ejects T actuation time
2, solenoid directional control valve commutation control signal outputs to hydraulic actuator and completes the time T recalled
3, T actuation time recalled by hydraulic actuator
4, the shortest of solenoid directional control valve gives electricity time T
5, the shortest power-off time T of solenoid directional control valve
6; Export solenoid directional control valve and open the time point of control signal and this regulates the time lag of work cycle key phase signal to be T
7, T
7>=0 is that this regulates work cycle key phase signal to postpone to export solenoid directional control valve unlatching control signal, T relatively
7<0 is for this regulates work cycle key phase signal to export solenoid directional control valve unlatching control signal in advance relatively, and advancement amount is T
7absolute value; T interval time that control signal outputs to the output of commutation control signal opened by solenoid directional control valve
8; Above unit of time is second;
Determine compressor operation parameters and controling parameters, Operational Limits comprises: compressor operating rotating speed n, unit: rev/min; Compressor operating cycle duration T, unit: second; Gas is compressed to the time T of exhaust pressure from suction pressure
rise, unit: second; Controling parameters comprises: the time T of rear suction valve late release from compression process
prolong, unit: second, T
prolong=T*arccos (2K-1)/2 π;
Solenoid directional control valve opens the output of control signal with reciprocating compression switch phase signals for benchmark, takes two kinds of modes to provide control signal, that is: provide with the cycle and open control signal and adjacent periods provides unlatching control signal; Provide with the cycle and open control signal and refer to provide unlatching control signal in this regulating cycle key phase signal moment, provide signal and perform an action and to complete in the circulation of same compressor operating; Adjacent periods provides opens control signal and refers to and provide signal in the previous cycle of this regulating cycle, and performs an action two adjacent periods;
Time controling pattern comprises the control of single change duration, single certain time length controls, become duration and timing long composite control method three kinds;
Single change duration controls to refer to regular time point output solenoid directional control valve in each cycle and opens control signal, control signal duration T during K change
8respective change;
Single certain time length controls, and the control signal time span in each cycle immobilizes, and changes solenoid directional control valve and open control signal and send time point, calculates determine that different signals sends time point for different K;
Become duration and the long complex controll of timing, the control mode becoming duration is first adopted when tolerance regulates from full capacity, the different control signal endurance is obtained, when providing solenoid directional control valve commutation control signal and provide the time lag Δ T=1.2T that control signal opened by solenoid directional control valve next time according to K change calculations
6time, be switched to the control mode that timing is long, calculate for different K and determine that different solenoid directional control valves is opened control signal and sent time point, the fixing control signal endurance;
According to compressor operation parameters, the controlling method that the relation determination tolerance between the response time parameter of controling parameters and hydraulic actuator regulates and control time parameter, concrete step comprises:
First, judge that can actuator realize 0-100% tolerance and regulate under working speed: the operation cycle duration T calculating compressor according to compressor operating rotating speed n, as T/2-(T
2+ T
3) <0, actuator can not meet the requirement that this rotating speed compressor 0-100% tolerance regulates, then no longer perform following steps; As T/2-(T
2+ T
3)>=0, actuator can meet the requirement that this rotating speed compressor 0-100% tolerance regulates;
Secondly, adjustment control method is determined:
1) for actuator and pipeline, be T to electric duration
5corresponding T
1with give electric duration be T-T
6corresponding T
1difference, or give electric duration be T
5corresponding T
3with give electric duration be T-T
6corresponding T
3difference when being greater than T/20, think that this actuator and pipeline are for more responsive to the change of electric duration, can only adopt the long controlling method of timing; For single certain time length controlling method, the control signal duration T in each cycle
8immobilize, get T
8for T
1-T
2-T
3+ T/2 and T-T
6between minimum value, get T
7=-(T
8+ T
3-T/2)+T
prolong, T
7with T
prolongchange respective change;
2) be T to electric duration
5corresponding T
1with give electric duration be T-T
6corresponding T
1difference, or give electric duration be T
5corresponding T
3with give electric duration be T-T
6corresponding T
3difference when being less than or equal to T/20, think that this actuator and pipeline are for insensitive to the change of electric duration, discuss to following situation:
A) T is worked as
6-T
3-T
rise≤ T/2-T
3-T
5, i.e. T
6-T
rise≤ T/2-T
5shi Caiyong single change duration controlling method can realize tolerance 0 ~ 100% all-range and regulate, T
7span be [(T
6-T
3-T
rise), (T/2-T
3-T
5)], the control signal duration T in each cycle
8=T/2-T
3-T
7+ T
prolong, T
8with T
prolongchange respective change;
B) T is worked as
6-T
3-T
rise> T/2-T
3-T
5, i.e. T
6-T
rise> T/2-T
5the composite control method becoming duration and the long combination of timing then can only be adopted to realize tolerance 0 ~ 100% all-range step-less adjustment:
A. to K=100% load, the time point T of control signal is provided
7=T/2-T
3-T
5, control signal duration T
8=T/2-T
3-T
5;
B. load value K is reduced to the process of 0 from 100%, if T-T
8> 1.2T
6, adopt the control mode becoming duration, provide the time point T of control signal
7=T/2-T
3-T
5, control signal duration T
8=T/2-T
3-T
5+ T
prolong, T
8with T
prolongchange and change;
C. load value K is reduced to the process of 0 from 100%, if T-T
8≤ 1.2T
6, be switched to the control mode that timing is long, control signal duration T
8=T-1.2T
6, T
7=-T
3-T/2+T
prolong+ 1.2T
6, T
7with T
prolongchange respective change.
The reciprocating compressor stepless tolerance regulating method that the present invention relates to efficiently avoid the compressor rotary speed high workload cycle and shortly requires high limitation for actuator's speed of response, makes actuator be suitable for the compressor of maximum magnitude working speed.
Accompanying drawing explanation
Fig. 1 is the controlling method schematic diagram that the present invention is directed to different rotating speeds compressor and parameter of actuating mechanism;
Fig. 2 is the single change duration control principle schematic diagram of same cycle that the present invention realizes on 300r/min air compressor;
Fig. 3 is the adjacent periods single change duration control principle schematic diagram that the present invention realizes on 400r/min air compressor;
Fig. 4 be under the change duration that realizes on 500r/min air compressor of the present invention and the long complex controll mode of timing fiducial time control principle schematic diagram;
Fig. 5 is the control principle schematic diagram of 50% tolerance under the change duration that realizes on 500r/min air compressor of the present invention and the long complex controll mode of timing;
Fig. 6 is the control principle schematic diagram of 20% tolerance under the change duration that realizes on 500r/min air compressor of the present invention and the long complex controll mode of timing;
Fig. 7 be under single certain time length control mode of realizing on 500r/min air compressor of the present invention fiducial time control principle schematic diagram;
Fig. 8 is the control principle schematic diagram of 50% tolerance under single certain time length control mode of realizing on 500r/min air compressor of the present invention;
Embodiment
Below in conjunction with accompanying drawing, principle of the present invention and mode of execution are described in detail.
Implement the present invention and need the hydraulic actuator backing down suction valve of a set of designed, designed and the control system of a hydraulic control actuator, this hydraulic actuator comprises hydraulic oil unit, hydraulicdirectional control valve, oil circuit, oil hydraulic cylinder, unloader etc., control system is made up of Siemens s7-300 programmable logic controller (PLC), solid-state relay and peripheral circuit, and the response parameter of hydraulic actuator and control system is as follows:
Eject control signal to output to hydraulic actuator and complete and eject T actuation time
1=45ms;
Hydraulic actuator ejects T actuation time
2=16ms;
Recall control signal to output to hydraulic actuator and complete Withdrawal times T
3=35ms;
T actuation time recalled by hydraulic actuator
4=16ms;
The the shortest of hydraulicdirectional control valve gives electricity time T
5=45ms;
The shortest power-off time T of hydraulicdirectional control valve
6=30ms;
PLC delay time precision t=1ms;
(1) embodiment 1:
With a working speed for 300r/min, pressure of inspiration(Pi) is 0.1MPa, and exhaust pressure is the 2D type reciprocating compressor of 0.3MPa is example.
Compressor operating rotating speed is n=300r/min operation cycle duration T=200ms, T
rise=12ms, T/2-(T
2+ T
3)=49ms>0, actuator ejects-keeps-recalls action can compression process complete before starting in one cycle, actuator can meet this working speed compressor tolerance and regulate; Test obtains actuator and oil circuit for insensitive to electric duration change, T
6-T
rise=30ms-12ms=18ms, T/2-T
5=100ms-45ms=55ms, therefore T
6-T
rise< T/2-T
5, adopt single change duration controlling method can realize tolerance 0 ~ 100% all-range and regulate, provide the time point T of control signal
7=[(T
6-T
3-T
rise), (T/2-T
3-T
5)]=[-17ms, 20ms], T
7be taken as 0, the control signal duration T in each cycle
8=T/2-T
3-T
7+ T
prolong.
With reference to the single compressor cycle on the left of accompanying drawing 2, adopt in this way benchmark to electricity time (T
prolong=0) be 65ms, now actuator can complete before compression process starts eject-keep-recall action, do not have gas backstreaming tolerance to be still 100%, T on this basis
prolongcontrol signal duration T during change
8increase and then have portion gas and pushed back in air-inlet cavity and make air displacement can corresponding minimizing.
For 50% tolerance, partial journey is adopted to back down the regulating method of suction valve and regulate with the controlling method of cycle variable time step.Tolerance percentage K=50%=0.5, according to formula
calculate T
prolong=50ms, starts to provide in each periodical chain phase signals of compressor and opens point control signal mode, shown in control cycle figure single on the right side of accompanying drawing 2, equally through delay time T
1≈ 45ms actuator backs down air valve completely, backs down air valve course of action duration T
2≈ 16ms; T is added at original 65ms fiducial time
prolong, what obtain corresponding 50% tolerance is 115ms to the electricity time; Through T after terminating to electricity
3≈ 35ms actuator recalls completely, and air valve is closed completely.
Two compressor operating cycles of comparative drawings figs 2, different the while of long for the compressor cycle time do not have the situation of time delay to adopt with cycle variable time step controlling method to actuator's action response under electric duration, this control is fixed on output when compressor cycle starts and opens point control signal, what different tolerance was corresponding different gives electric time step, realizes the step-less adjustment of tolerance to electricity time length by adjustment.
(2) embodiment 2:
With a working speed for 400r/min, air displacement is 10m
3the air compressor of/min is example.
Compressor operating rotating speed is n=400r/min operation cycle duration T=150ms, T
rise=10ms, T/2-(T
2+ T
3)=24ms>0, actuator ejects-keeps-recalls action can compression process complete before starting in one cycle, actuator can meet this working speed compressor tolerance and regulate; Test obtains actuator and oil circuit for insensitive to electric duration change, T
6-T
rise=30ms-10ms=20ms, T/2-T
5=75ms-45ms=30ms, therefore T
6-T
rise< T/2-T
5, adopt single change duration controlling method can realize tolerance 0 ~ 100% all-range and regulate, provide the time point T of control signal
7=[(T
6-T
3-T
rise), (T/2-T
3-T
5)]=[-15ms ,-5ms], T
7be taken as-5ms, the control signal duration T in each cycle
8=T/2-T
3-T
7+ T
prolong.
With reference to the single compressor cycle on the left of accompanying drawing 3, adopt in this way benchmark to electricity time (T
prolong=0) be 45ms, control signal advancement amount T
0=-5ms now actuator can complete before compression process starts eject-keep-recall action, do not have gas backstreaming tolerance to be still 100%, increase again on this basis and then have portion gas to electric time value and pushed back in air-inlet cavity and make air displacement can corresponding minimizing.
For 50% tolerance, go out accumulation interval T according to the formulae discovery in example 1 equally
prolong=50ms, the mode providing control signal adopts the mode in a cycle after last periodic control; After arriving see each periodical chain phase signals of accompanying drawing 3, time delay 145ms provides control signal, is add accumulation interval fiducial time to the electricity time, i.e. 95ms; The same time delay actuator through 35ms after terminating to electricity recalls completely.
Two compressor operating cycles of comparative drawings figs 3, for the compressor of about 400r/min, under difference gives electric duration, actuator's action response does not have the situation of time delay to adopt adjacent periods variable time step controlling method, this control is fixed on when compressor cycle starts and exports control signal, what different tolerance was corresponding different gives electric time step, realizes the step-less adjustment of tolerance to electricity time length by adjustment.
(3) embodiment 3:
Be the air compressor of 500r/min for a working speed in example 3, adopt the hydraulic actuator identical with embodiment 2 with embodiment 1 and control system, realize the step-less adjustment of tolerance, concrete controlling method is as described below:
Compressor operating rotating speed is n=500r/min, operation cycle duration T=120ms, T
rise=8ms.T/2-(T
2+ T
3)=9ms>0, actuator ejects-keeps-recalls action can compression process complete before starting in one cycle, actuator can meet this working speed compressor tolerance equally and regulate; Test obtains actuator and oil circuit for insensitive to electric duration change, T
6-T
rise=30ms-8ms=22ms, T/2-T
5=60ms-45ms=15ms, therefore T
6-T
rise> T/2-T
5, adopt single change duration controlling method can not realize tolerance 0 ~ 100% all-range and regulate, can only composite control method be adopted; Adopt the controlling method becoming duration when tolerance is more, provide the time point T of control signal
7=(T/2-T
3-T
5)]=-20ms, control signal duration T
8=T/2-T
3-T
7+ T
prolong; When tolerance is reduced to corresponding control signal duration T
8>=T-1.2T
6time, be switched to the control mode that timing is long, control signal duration T
8=T-1.2T
6, provide the time point T of control signal
7=-T
3-T/2+T
prolong+ 1.2T
6, T
7with T
prolongchange, i.e. the change respective change of setup parameter K;
With reference to accompanying drawing 4, adopt in this way benchmark to electricity time (T
prolong=0) be 45ms, control signal advancement amount T
0=-20ms now actuator can complete before compression process starts eject-keep-recall action, do not have gas backstreaming tolerance to be still 100%, increase again on this basis and then have portion gas to electric time value and pushed back in air-inlet cavity and make air displacement can corresponding minimizing.
Be the control signal of tolerance when reducing to 50% and actuator's action shown in accompanying drawing 5, first go out accumulation interval T by formulae discovery
prolong=30ms; After each periodical chain phase signals arrives, time delay 100ms provides control signal, is add accumulation interval fiducial time to the electricity time, i.e. 75ms; The same time delay actuator through 35ms after terminating to electricity recalls completely.
Accumulation interval T is gone out by formulae discovery when tolerance reduces to 20%
prolong=43ms, after each periodical chain phase signals arrives, time delay 100ms provides control signal, be add accumulation interval fiducial time to the electricity time, i.e. 88ms, now provide stop control signal and provide the time lag Δ T=32ms<1.2T6=36ms opening point control signal next time, 20% tolerance is step size controlling mode of fixing time.Shown in accompanying drawing 6, whole control signal translation 13ms, has still ejected in the somewhere of breathing process through certain delay time actuator equally and has kept ejecting, and actuator recalls action compared to the fiducial time in accompanying drawing 5 of time delay (T backward
07ms is become from 20ms), recall in compression process, tolerance reduces to the amount of needs.
(4) embodiment 4:
In example 3, if actuator and pipeline are more responsive for giving the change of electric duration, the long controlling method of timing can only be adopted, for single certain time length controlling method, the control signal duration T in each cycle
8immobilize, get T
8=min [(T
1-T
2-T
3+ T/2), (T-T
6)]=min [55ms, 90ms]=55ms, provide the time point T of control signal
7=-(T
8+ T
3-T/2)+T
prolong, T
7with T
prolongchange, i.e. the change respective change of setup parameter K;
Attachedly Figure 7 shows that benchmark is to electric control signal (T
prolong=0) the time point T of control signal, is provided
7=-30ms, increases on this basis and will correspondingly reduce to electricity time tolerance.As can be seen from the figure the control signal controlling the ejecting-keep of each cycle actuator-recall action interimly to provide in the last week, and advancement amount is 30ms, from providing control signal through T
1=45ms actuator completes and ejects action and keep ejecting, power-off after giving electric 55ms, then recalls completely through 35ms delay actuator.
Be the control signal of tolerance when reducing to 50% and actuator's action shown in accompanying drawing 8, first go out accumulation interval T by formulae discovery
prolong=30ms; Adopt single step size control method of fixing time, give electricity time T
8=55ms remains unchanged, and provides the time point T of control signal
7=-(T
8+ T
3-T/2)+T
prolong=0, namely control signal integral translation 30ms just in time provides and opens point control signal after key phase signal arrives, the delay time actuator that same process is certain has still ejected in the somewhere of breathing process and has kept ejecting, actuator recalls action compared to the fiducial time of time delay backward in accompanying drawing 7, recalls in compression process the amount that tolerance reduces to needs.
Claims (1)
1. adopt a reciprocating compressor stepless tolerance regulating method for flexible time control mode, it is characterized in that, be applied to following system:
This system comprises hydraulic power system, hydraulic actuator, air valve relief arrangement, tolerance regulation and control system, Signal Measurement System and supporting sealing mechanism;
Hydraulic power system comprises fuel reserve tank, motor, hydraulic-pressure pump, accumulator, pressure gauge, level meter, pressure-control relay, safety valve, unloading valve and pressure line; Hydraulic actuator is hydraulic jack, comprises plunger and seal element in oil cylinder; Air valve relief arrangement carries unloader by Aspirating valves and forms, and unloader push rod contacts with Cylinder Plunger; Tolerance regulation and control system comprises solenoid directional control valve, programmable logic controller (PLC), solid-state relay and coherent signal cable; Signal Measurement System comprises current vortex sensor and key phase acquisition system;
The method comprises the steps:
Tolerance regulates setup parameter to be K, K=0 ~ 1, represents the ratio that on-the-spot reciprocating compressor actual demand air displacement accounts for rated discharge amount;
Determine the response time parameter of hydraulic actuator, comprising: solenoid directional control valve unlatching control signal outputs to hydraulic actuator and completes the time T ejecting action
1, hydraulic actuator ejects T actuation time
2, solenoid directional control valve commutation control signal outputs to hydraulic actuator and completes the time T recalled
3, T actuation time recalled by hydraulic actuator
4, the shortest of solenoid directional control valve gives electricity time T
5, the shortest power-off time T of solenoid directional control valve
6; Export solenoid directional control valve and open the time point of control signal and this regulates the time lag of work cycle key phase signal to be T
7, T
7>=0 is that this regulates work cycle key phase signal to postpone to export solenoid directional control valve unlatching control signal, T relatively
7<0 is for this regulates work cycle key phase signal to export solenoid directional control valve unlatching control signal in advance relatively, and advancement amount is T
7absolute value; T interval time that control signal outputs to the output of commutation control signal opened by solenoid directional control valve
8; Above unit of time is second;
Determine compressor operation parameters and controling parameters, Operational Limits comprises: compressor operating rotating speed n, unit: rev/min; Compressor operating cycle duration T, unit: second; Gas is compressed to the time T of exhaust pressure from suction pressure
rise, unit: second; Controling parameters comprises: the time T of rear suction valve late release from compression process
prolong, unit: second, T
prolong=T*arccos (2K-1)/2 π;
Solenoid directional control valve opens the output of control signal with reciprocating compression switch phase signals for benchmark, takes two kinds of modes to provide control signal, that is: provide with the cycle and open control signal and adjacent periods provides unlatching control signal; Provide with the cycle and open control signal and refer to provide unlatching control signal in this regulating cycle key phase signal moment, provide signal and perform an action and to complete in the circulation of same compressor operating; Adjacent periods provides opens control signal and refers to and provide signal in the previous cycle of this regulating cycle, and performs an action two adjacent periods;
Time controling pattern comprises the control of single change duration, single certain time length controls, become duration and timing long composite control method three kinds;
Single change duration controls to refer to regular time point output solenoid directional control valve in each cycle and opens control signal, control signal duration T during K change
8respective change;
Single certain time length controls, and the control signal time span in each cycle immobilizes, and changes solenoid directional control valve and open control signal and send time point, calculates determine that different signals sends time point for different K;
Become duration and the long complex controll of timing, the control mode becoming duration is first adopted when tolerance regulates from full capacity, the different control signal endurance is obtained, when providing solenoid directional control valve commutation control signal and provide the time lag Δ T=1.2T that control signal opened by solenoid directional control valve next time according to K change calculations
6time, be switched to the control mode that timing is long, calculate for different K and determine that different solenoid directional control valves is opened control signal and sent time point, the fixing control signal endurance;
According to compressor operation parameters, the controlling method that the relation determination tolerance between the response time parameter of controling parameters and hydraulic actuator regulates and control time parameter, concrete step comprises:
First, judge that can actuator realize 0-100% tolerance and regulate under working speed: the operation cycle duration T calculating compressor according to compressor operating rotating speed n, as T/2-(T
2+ T
3) <0, actuator can not meet the requirement that this rotating speed compressor 0-100% tolerance regulates, then no longer perform following steps; As T/2-(T
2+ T
3)>=0, actuator can meet the requirement that this rotating speed compressor 0-100% tolerance regulates;
Secondly, adjustment control method is determined:
1) for actuator and pipeline, be T to electric duration
5corresponding T
1with give electric duration be T-T
6corresponding T
1difference, or give electric duration be T
5corresponding T
3with give electric duration be T-T
6corresponding T
3difference when being greater than T/20, think that this actuator and pipeline are for more responsive to the change of electric duration, can only adopt the long controlling method of timing; For single certain time length controlling method, the control signal duration T in each cycle
8immobilize, get T
8for T
1-T
2-T
3+ T/2 and T-T
6between minimum value, get T
7=-(T
8+ T
3-T/2)+T
prolong, T
7with T
prolongchange respective change;
2) be T to electric duration
5corresponding T
1with give electric duration be T-T
6corresponding T
1difference, or give electric duration be T
5corresponding T
3with give electric duration be T-T
6corresponding T
3difference when being less than or equal to T/20, think that this actuator and pipeline are for insensitive to the change of electric duration, discuss to following situation:
A) T is worked as
6-T
3-T
rise≤ T/2-T
3-T
5, i.e. T
6-T
rise≤ T/2-T
5shi Caiyong single change duration controlling method can realize tolerance 0 ~ 100% all-range and regulate, T
7span be [(T
6-T
3-T
rise), (T/2-T
3-T
5)], the control signal duration T in each cycle
8=T/2-T
3-T
7+ T
prolong, T
8with T
prolongchange respective change;
B) T is worked as
6-T
3-T
rise> T/2-T
3-T
5, i.e. T
6-T
rise> T/2-T
5the composite control method becoming duration and the long combination of timing then can only be adopted to realize tolerance 0 ~ 100% all-range step-less adjustment:
A. to K=100% load, the time point T of control signal is provided
7=T/2-T
3-T
5, control signal duration T
8=T/2-T
3-T
5;
B. load value K is reduced to the process of 0 from 100%, if T-T
8> 1.2T
6, adopt the control mode becoming duration, provide the time point T of control signal
7=T/2-T
3-T
5, control signal duration T
8=T/2-T
3-T
5+ T
prolong, T
8with T
prolongchange and change;
C. load value K is reduced to the process of 0 from 100%, if T-T
8≤ 1.2T
6, be switched to the control mode that timing is long, control signal duration T
8=T-1.2T
6, T
7=-T
3-T/2+T
prolong+ 1.2T
6, T
7with T
prolongchange respective change.
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