CN103033004B - A kind of control method of automotive air-conditioning system electric expansion valve - Google Patents
A kind of control method of automotive air-conditioning system electric expansion valve Download PDFInfo
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- CN103033004B CN103033004B CN201110292702.8A CN201110292702A CN103033004B CN 103033004 B CN103033004 B CN 103033004B CN 201110292702 A CN201110292702 A CN 201110292702A CN 103033004 B CN103033004 B CN 103033004B
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Abstract
The present invention discloses a kind of control method of automotive air-conditioning system electric expansion valve, determines the aperture preconditioning amount s of described electric expansion valve according to the rotating speed of described compressor
0according to refrigerant temperature and the actual degree of superheat Tsh of calculation of pressure of evaporator outlet or compressor inlet, and the described actual degree of superheat and the degree of superheat threshold interval preset are compared, obtain aperture increment of adjustment Δ s described aperture preconditioning amount and described aperture increment of adjustment are added up after the control end of control signal s extremely described electric expansion valve of Drazin inverse aperture.This method makes electronic expansion valve opening reach a certain situation in advance according to default degree of superheat threshold interval, can reduce over the amplitude of accommodation that temperature regulates the stage, avoid the action of electric expansion valve overfrequency, improve the life-span of electric expansion valve; And further reduce system low-voltage pressure oscillation, reduce system energy consumption, guarantee system normal, run efficiently.
Description
Technical field
The present invention relates to refrigeration control technology, be specifically related to a kind of control method of automotive air-conditioning system electric expansion valve.
Background technology
As everyone knows, in automotive system, air conditioning for automobiles is main energy resource consumption unit, and along with the raising of car load power conservation requirement, the energy-conservation of air conditioning for automobiles is also progressively suggested.Particularly in vehicle electric system, due to the finite capacity of battery, the course continuation mileage of automobile is restricted.Therefore, the energy-conservation of electric automobile air conditioner seems particularly important.
In automotive air-conditioning system, effective control system refrigerant flow, making system play optimum usefulness, is the key point that can system energy-conservation.Specific to electric automobile air conditioner, because compressor can gearshift adjustment, working conditions change scope is large, must use the flow of electric expansion valve fine adjustment cold-producing medium, to adapt to the changes in flow rate requirement of compressor.Obviously, electric expansion valve itself is an execution unit just, needs a rational control logic accurately to adjust the aperture of expansion valve, makes system reach performance optimization and reliability service.
The whole process run according to automotive air-conditioning system divides, and the control of electric expansion valve comprises startup substantially, runs several stages such as control and shutdown.Wherein, running the control stage is the critical stage affecting energy consumption adjustment, directly affects the Energy Saving Control precision of air-conditioning system.
In view of this, urgently a kind of reasonable, effective control method is proposed, to meet the technical requirement that energy consumption regulates to greatest extent for the control of automotive air-conditioning system electric expansion valve.
Summary of the invention
For above-mentioned defect, the technical problem that the present invention solves is the control method providing a kind of automotive air-conditioning system electric expansion valve, by one of input signal that compressor rotary speed is controlled as electronic expansion valve opening, and in conjunction with the degree of superheat of evaporator outlet or compressor inlet, accurate control electronic expansion valve opening, guarantee system normal, run efficiently, and effectively reduce the fluctuating range of system, reduce system energy consumption.
The control method of automotive air-conditioning system electric expansion valve provided by the invention, determines the aperture preconditioning amount s of described electric expansion valve according to the rotating speed of compressor
0, according to refrigerant temperature and the actual degree of superheat Tsh of calculation of pressure of evaporator outlet or compressor inlet, and the described actual degree of superheat and the degree of superheat threshold interval Tsh_set preset are compared, obtain aperture increment of adjustment Δ s; By described aperture preconditioning amount s
0after adding up with described aperture increment of adjustment Δ s, the control signal s of Drazin inverse aperture is to the control end of described electric expansion valve;
Described degree of superheat threshold interval is with basic degree of superheat threshold curve for benchmark forms a closed interval, and the described degree of superheat threshold interval in normal degree of superheat setting range is formed by the basic degree of superheat threshold curve temperature definite value that fluctuates; The described degree of superheat threshold interval when degree of superheat is 0 DEG C is set as 0 DEG C; The described degree of superheat threshold interval when degree of superheat is greater than 20 DEG C is set as 0 DEG C.
Preferably, described temperature definite value is specially and is less than 1.5 DEG C.
Preferably, the degree of superheat threshold interval of low load region and high load region is all less than or equal to the degree of superheat threshold interval in normal duty district.
Preferably, more low overheat threshold interval is less for the degree of superheat of low load region; It is less that the degree of superheat of high load region more exceeds heat degree threshold interval.
Preferably, the described degree of superheat threshold interval of low load region and intersection of normal duty district is arc-shaped gradual transition; The described degree of superheat threshold interval of normal duty district and high load region intersection is arc-shaped gradual transition.
Preferably, described low load region is specially the region that evaporating temperature is less than-1 DEG C, and described high load region is specially the region that evaporating temperature is greater than 15 DEG C.
Preferably, the rotating speed of described compressor is divided multiple traffic coverage, and determine the aperture preconditioning amount s of corresponding described electric expansion valve according to the compressor rotary speed of each traffic coverage
0.
Preferably, meet with the rotating speed of described compressor and maintain very first time length for condition in corresponding traffic coverage, determine the aperture preconditioning amount s of described electric expansion valve according to the rotating speed of described compressor
0.
Preferably, control described electric expansion valve and perform standard-sized sheet, full cut-off two actions successively; And in the second time span, complete standard-sized sheet and full cut-off for condition, by described aperture preconditioning amount s with described electric expansion valve
0after adding up with described aperture increment of adjustment Δ s, the control signal s of Drazin inverse aperture is to the control end of described electric expansion valve.
Control method of the present invention, by the refrigerant temperature of the compressor rotary speed of Real-time Obtaining, evaporator outlet or compressor inlet and the pressure and other parameters basis for estimation as control strategy, using the preconditioning basis of the tach signal of compressor as aperture, and the aperture increment of adjustment comparing acquisition according to the real-time degree of superheat and default degree of superheat threshold interval on this basis determines final control signal, and then export the control end of electric expansion valve to, accurately to control electronic expansion valve opening, thus making system cloud gray model relatively stable, fluctuating range reduces.That is, this method makes electronic expansion valve opening reach a certain situation in advance according to default degree of superheat threshold interval, the amplitude of accommodation that temperature regulates the stage can be reduced over, avoid the action of electric expansion valve overfrequency, thus reduce movement range and the frequency of electric expansion valve, improve the life-span of electric expansion valve; And further reduce system low-voltage pressure oscillation, reduce system energy consumption, guarantee system normal, run efficiently.
Prepositionly in preferred version of the present invention be provided with optimal control condition, if the rotating speed of compressor maintains certain hour length in corresponding traffic coverage, then determine aforementioned aperture preconditioning amount s according to this corresponding stable rotating speed
0.That is, meet with the rotating speed of described compressor maintain very first time length for condition in corresponding traffic coverage, determine the aperture preconditioning amount s of described electric expansion valve according to the rotating speed of described compressor
0.Setting like this, can avoid causing controlling point of penetration in the starting stage inaccurate, avoid the improper influence of fluctuations precision of real time control of compressor rotary speed, thus provide good basis for the follow-up normal control stage, the job stability of further raising system.
Another preferred version of the present invention has additional self-inspection step, controls described electric expansion valve and performs standard-sized sheet, full cut-off two actions successively; And in the second time span, complete standard-sized sheet and full cut-off for condition, by described aperture preconditioning amount s with described electric expansion valve
0after adding up with described aperture increment of adjustment Δ s, the control signal s of Drazin inverse aperture is to the control end of described electric expansion valve.That is, the self-inspection of electric expansion valve was carried out before control signal s exports, if electric energy expansion valve can determining to complete standard-sized sheet, full cut-off two actions in time span in order, then determine that electric expansion valve is in normal operating conditions, executable system controls, thus guarantees that Systematical control carries out safely and reliably.
The control method of automotive air-conditioning system electric expansion valve provided by the invention is applicable to multi-form automotive air-conditioning system, is specially adapted to electric automobile air-conditioning system.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of the control method of automotive air-conditioning system electric expansion valve described in first embodiment of the invention;
Fig. 2 shows the control logic relation schematic diagram of control method for overheat described in the first embodiment;
Fig. 3 is the FB(flow block) of the control method of automotive air-conditioning system electric expansion valve described in second embodiment of the invention;
The relation curve schematic diagram that Fig. 4 is degree of superheat threshold interval described in a kind of detailed description of the invention and basic degree of superheat threshold value;
Fig. 5 shows schematic diagram and the electronic expansion valve opening preconditioning amount s thereof of a kind of mode of the division in the interval of compressor operating described in detailed description of the invention
0and the corresponding relation schematic diagram between compressor operating interval.
Detailed description of the invention
Core of the present invention is to provide a kind of control method of automotive air-conditioning system electric expansion valve, precisely to control the degree of superheat of evaporator outlet or compressor inlet, on the basis of effective control system efficiency, guarantee system normal, run efficiently.Present embodiment is illustrated below in conjunction with Figure of description.
Refer to Fig. 1 and Fig. 2, wherein, Fig. 1 shows the FB(flow block) of the control method of automotive air-conditioning system electric expansion valve described in the first embodiment, and Fig. 2 shows the control logic relation of control method for overheat described in the first embodiment.
As shown in the figure, this control method for overheat carries out according to following step:
S1. the aperture preconditioning amount s of described electric expansion valve is determined according to the rotating speed (RPM) of described compressor
0; Using the preconditioning of the tach signal of compressor as aperture, make aperture reach a certain situation in advance, thus electric expansion valve regulates the stage amplitude of accommodation in the degree of superheat can be reduced.
S2. according to refrigerant temperature and the actual degree of superheat Tsh of calculation of pressure of evaporator outlet or compressor inlet.
S3. described actual degree of superheat Tsh and the degree of superheat threshold interval Tsh_set preset are compared, obtain aperture increment of adjustment Δ s.
S4. by described aperture preconditioning amount s
0after adding up with described aperture increment of adjustment Δ s, the control signal s of Drazin inverse aperture is to the control end of described electric expansion valve.
In control method described in this programme, step S1, S2, S3 can be performed successively as shown in Figure 1; Also can first perform step S2, S3, and then perform step S1.Because this programme can control electronic expansion valve opening according to default degree of superheat threshold interval determination aperture increment of adjustment Δ s, namely the degree of superheat in interval range changes on a small quantity, does not carry out aperture adjustment, avoid the action of electric expansion valve overfrequency, thus reduce movement range and the frequency of electric expansion valve, improve the life-span of electric expansion valve; And further reduce system low-voltage pressure oscillation, reduce system power consumption, guarantee system normal, run efficiently.
Should be appreciated that the aperture of electric expansion valve refers to the ratio of the valve port flow area of gained compared with during electric expansion valve standard-sized sheet.This ratio is also relevant to the amount of capacity of the electric expansion valve that this system is mated, if electric expansion valve capacity relative used is comparatively large, then aperture can be smaller; Otherwise aperture is larger.It should be noted that, for the automotive system of LIN or CAN signal, the real-time parameter involved by this method, effectively can utilize LIN signal or CAN signal to obtain, also can gather separately.Such as, the temperature of evaporator outlet or compressor inlet is recorded by thermal resistance, and pressure signal is recorded by pressure sensor, and these two signals convert input control plate after voltage or current signal to by change-over circuit.Then, temperature and pressure is calculated the actual degree of superheat to compare with the setting degree of superheat, the control algolithms such as passing ratio (P), proportional integral (PI) or PID (PID) realize the control of the degree of superheat, until the actual degree of superheat of system meets the degree of superheat requirement of setting.Should be appreciated that those skilled in the art can realize the acquisition of above-mentioned parameter completely based on prior art, therefore repeat no more herein.
In system operation, because other external causes very easily cause compressor rotary speed to occur fluctuation.For overcoming relevant parameter fluctuation for the impact of system works stability, the invention provides the embodiment of the second control method for overheat, the FB(flow block) of the control method of automotive air-conditioning system electric expansion valve specifically shown in Figure 3.
Compared to the first embodiment, this programme has done 2 optimizations.
First, perform step S02 before performing step S1: meet with the rotating speed of described compressor and maintain very first time length for condition in corresponding traffic coverage, perform step S1, determine the aperture preconditioning amount s of described electric expansion valve according to the rotating speed of described compressor
0.
As previously mentioned, the rotating speed of compressor for a certain reason may at any time in change, for the action avoiding expansion valve too fast, cause that control is too frequent and system low-voltage pressure oscillation is too large, therefore, compared to the first embodiment, the step S02 that this programme is set up can avoid the fluctuation of compressor rotary speed to cause electric expansion valve frequent movement and make system fluctuation amplitude too large, thus effectively improves system energy efficiency; That is, the aperture just adjusting expansion valve after compressor rotary speed maintains each traffic coverage certain hour length is only had.Certainly, very first time length can adjust according to automotive air-conditioning system concrete condition, and such as, this very first time length can be set as 5s, 10s or 15s.
In addition, also comprise self-inspection step S01, control described electric expansion valve and perform standard-sized sheet, full cut-off two actions successively; And in the second time span, complete standard-sized sheet and full cut-off for condition, by described aperture preconditioning amount s with described electric expansion valve
0after adding up with described aperture increment of adjustment Δ s, the control signal s of Drazin inverse aperture is to the control end of described electric expansion valve.That is, before control signal s exports, carry out the self-inspection of electric expansion valve, if electric expansion valve determining to complete standard-sized sheet, full cut-off two actions in time span in order, then can determine that electric expansion valve is in normal operating conditions, executable system controls; Then send alarm signal if not or enter stoppage protection state.Obviously, the setting of self-inspection step can make Systematical control carry out under state more safely and reliably.It should be explicitly made clear at this point equally, in method described in the present embodiment, step S01, S02 can be performed successively as shown in Figure 3; Also first can perform step S02, and then perform step S01.
Ben, for the realization of electric expansion valve self-checking function, as long as in theory its can within the scheduled time from full cut-off to standard-sized sheet or from standard-sized sheet to full cut-off, be namely considered as this electric expansion valve and be in unfaulty conditions.Be to be understood that, complete standard-sized sheet in this programme, full cut-off carries out self-inspection and be judged as preferred version, in addition, other signals can also be adopted to carry out auxiliary judgment, as complete in order in very first time length with electric expansion valve standard-sized sheet, full cut-off two actions and do not have abnormal signal feed back carry out judging etc.Apparently, the scope of the application's request protection is all belonged to based on core design design application of aforementioned two kinds of one-stroke self-checking behaviors of the application.
Further, degree of superheat threshold interval described in aforementioned two embodiments can degree of superheat threshold curve be benchmark substantially, as shown in Figure 4, this figure is the relation curve schematic diagram of a kind of described degree of superheat threshold interval and basic degree of superheat threshold value, in figure, solid line represents basic degree of superheat threshold curve, and dotted line represents the border of degree of superheat threshold interval.
As shown in Figure 4, in this embodiment, the described degree of superheat threshold interval in normal degree of superheat setting range (normal duty district) is set as ± 1 DEG C; The described degree of superheat threshold interval when degree of superheat (SHset) is 0 DEG C is set as 0 DEG C; The described degree of superheat threshold interval when degree of superheat (SHset) is greater than 20 DEG C is set as 0 DEG C, overallly forms a closed interval.It should be noted that, for clear, the interval relation formed based on basic degree of superheat threshold curve in degree of superheat region is shown, in figure, the degree of superheat (SHset) is greater than between the dotted line of 20 DEG C and solid line and there is minim gap, obviously, not complete totally enclosed shown position does not affect the understanding that this degree of superheat threshold interval is a closed interval.In addition, the degree of superheat threshold interval in normal degree of superheat setting range also can do corresponding adjustment according to system configuration, namely formed by the temperature definite value that fluctuates of the basic degree of superheat threshold curve in normal degree of superheat setting range, but not be confined to ± 1 DEG C; Such as, if automotive air-conditioning system temperature control precision requires higher, the degree of superheat threshold interval in its normal degree of superheat setting range can be set to ± and 0.5 DEG C; For another example, if automotive air-conditioning system temperature control requirement is relatively low, the degree of superheat threshold interval in its normal degree of superheat setting range can be set to ± 2 DEG C etc.Obviously, the size of this temperature definite value does not form the restriction to the application's protection domain, as long as the core design design of application this method is all in the scope of the application's request protection.
In addition, the degree of superheat threshold interval of low load region and high load region is all less than or equal to the degree of superheat threshold interval in normal duty district, like this, the degree of superheat by normal duty district through low load region to the degree of superheat (SHset) be in the interval of 0 DEG C of point, and the degree of superheat is greater than the interval of 20 DEG C in through high load region to the degree of superheat (SHset) by normal duty district, electronic expansion valve opening adjustment restriction is corresponding to diminish, to avoid electric expansion valve at the aperture Adjustment precision close to limit point place.Particularly, as shown in Figure 4, when evaporating temperature (Tevap) is less than-1 DEG C (low load region), described degree of superheat threshold interval linearly changes; And evaporating temperature (Tevap) is the position (low load region and intersection of normal duty district) of-1 DEG C, described degree of superheat threshold interval is arc-shaped gradual transition.When evaporating temperature (Tevap) is greater than 15 DEG C (high load region), described degree of superheat threshold interval linearly changes; And evaporating temperature (Tevap) is the position (normal duty district and high load region intersection) of 15 DEG C, described degree of superheat threshold interval is arc-shaped gradual transition.Obviously, all overall Long-term change trend in gradual change of the low load region in prioritization scheme, normal duty district and three, high load region section, makes control procedure comparatively steadily reliable; Meanwhile, adjacent Liang Ge section intersection is all in arc-shaped gradual transition, and namely the border change curve of low load region and high load region is all roughly in semi-parabolic shape, improves the steady reliability of control procedure further.It should be noted that equally, the division of low load region shown in Fig. 4, normal duty district and high load region is only an exemplary description, to clearly demonstrate core design of the present invention, the division of above-mentioned three loading zones also can be defined according to the concrete condition of system, does not repeat them here.
In addition, in aforementioned two embodiments, at starting stage (step S1), the rotating speed of described compressor can be divided multiple traffic coverage, and determine the aperture preconditioning amount s of corresponding described electric expansion valve according to the compressor rotary speed of each traffic coverage
0.As shown in Figure 5, take rated speed as the compressor of 5000RPM be example, its range of speeds can be divided into four traffic coverages: compressor rotary speed is in and is greater than 0RPM and is less than or equal to 1000RPM interval, compressor rotary speed is in and is greater than 1000RPM and is less than or equal to 3000RPM interval, compressor rotary speed is in and is greater than 3000RPM and is less than or equal to 5000RPM interval, and compressor rotary speed is in and is greater than 5000RPM.
In fact, the division in compressor operating interval is not limited to shown in Fig. 5, it can be determined according to compressor apolegamy and requirement of system design, also can determine by the following method: the aperture being controlled expansion valve by other means, under making the system under different operating mode, different rotating speeds be in the suitable degree of superheat, the relation of matching rotating speed and aperture, obtains electronic expansion valve opening pre-set value under different compressors rotating speed; Certainly, division interval in above-mentioned embodiment, the open range of electric expansion valve are not limitation of the present invention, and are only to provide a kind of thinking, and in fact, above-mentioned interval can also be multiple intervals of non-decile.In addition, electronic expansion valve opening also depends on the relation of this system and electronic expansion valve capacity, such as, when the electric expansion valve capacity relative that automotive air-conditioning system mates is wanted large, then and the aperture preconditioning amount s of electric expansion valve
0relatively smaller; And the electric expansion valve capacity relative mated when automotive air-conditioning system is wanted hour, then the aperture preconditioning amount s of electric expansion valve
0relatively larger, use needs all in the scope of the application's request protection as long as meet.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a control method for automotive air-conditioning system electric expansion valve, determines the aperture preconditioning amount s of described electric expansion valve according to the rotating speed of compressor
0, according to refrigerant temperature and the actual degree of superheat Tsh of calculation of pressure of evaporator outlet or compressor inlet, and the described actual degree of superheat and the degree of superheat threshold interval Tsh_set preset are compared, obtain aperture increment of adjustment Δ s; By described aperture preconditioning amount s
0after adding up with described aperture increment of adjustment Δ s, the control signal s of Drazin inverse aperture is to the control end of described electric expansion valve;
Described degree of superheat threshold interval is with basic degree of superheat threshold curve for benchmark forms a closed interval, and the described degree of superheat threshold interval in normal degree of superheat setting range is formed by the basic degree of superheat threshold curve temperature definite value that fluctuates; The described degree of superheat threshold interval when degree of superheat is 0 DEG C is set as 0 DEG C; The described degree of superheat threshold interval when degree of superheat is greater than 20 DEG C is set as 0 DEG C.
2. the control method of automotive air-conditioning system electric expansion valve according to claim 1, is characterized in that, described temperature definite value is specially and is less than 1.5 DEG C.
3. the control method of automotive air-conditioning system electric expansion valve according to claim 1, is characterized in that, the degree of superheat threshold interval of low load region and high load region is all less than or equal to the degree of superheat threshold interval in normal duty district.
4. the control method of automotive air-conditioning system electric expansion valve according to any one of claim 1 to 3, is characterized in that, more low overheat threshold interval is less for the degree of superheat of low load region; It is less that the degree of superheat of high load region more exceeds heat degree threshold interval.
5. the control method of automotive air-conditioning system electric expansion valve according to claim 4, is characterized in that, the described degree of superheat threshold interval of low load region and intersection of normal duty district is arc-shaped gradual transition; The described degree of superheat threshold interval of normal duty district and high load region intersection is arc-shaped gradual transition.
6. the control method of automotive air-conditioning system electric expansion valve according to claim 5, is characterized in that, described low load region is specially the region that evaporating temperature is less than-1 DEG C, and described high load region is specially the region that evaporating temperature is greater than 15 DEG C.
7. the control method of automotive air-conditioning system electric expansion valve according to any one of claim 1 to 3, it is characterized in that, the rotating speed of described compressor is divided multiple traffic coverage, and determines the aperture preconditioning amount s of corresponding described electric expansion valve according to the compressor rotary speed of each traffic coverage
0.
8. the control method of automotive air-conditioning system electric expansion valve according to claim 7, it is characterized in that, meet with the rotating speed of described compressor and maintain very first time length for condition in corresponding traffic coverage, determine the aperture preconditioning amount s of described electric expansion valve according to the rotating speed of described compressor
0.
9. the control method of automotive air-conditioning system electric expansion valve according to claim 8, is characterized in that, controls described electric expansion valve and performs standard-sized sheet, full cut-off two actions successively; And in the second time span, complete standard-sized sheet and full cut-off for condition, by described aperture preconditioning amount s with described electric expansion valve
0after adding up with described aperture increment of adjustment Δ s, the control signal s of Drazin inverse aperture is to the control end of described electric expansion valve.
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| CN1477355A (en) * | 2003-07-10 | 2004-02-25 | 上海交通大学 | Car air-conditioner evaporator refrigerating agent flow control system |
| CN101156033A (en) * | 2005-04-07 | 2008-04-02 | 大金工业株式会社 | Air conditioner coolant amount judgment system |
| CN101603751A (en) * | 2009-07-15 | 2009-12-16 | 北京科技大学 | A kind of frequency conversion energy-saving control method of refrigeration system |
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