CN103568776A - Automobile air-conditioning system and control method thereof - Google Patents
Automobile air-conditioning system and control method thereof Download PDFInfo
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- CN103568776A CN103568776A CN201210276586.5A CN201210276586A CN103568776A CN 103568776 A CN103568776 A CN 103568776A CN 201210276586 A CN201210276586 A CN 201210276586A CN 103568776 A CN103568776 A CN 103568776A
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Abstract
The invention relates to an automobile air-conditioning system and a control method of the automobile air-conditioning system. The control method comprises the steps of (S1) judging whether an automobile is about to be stopped or not; (S2) executing the parking control logic by an air conditioning control unit, and adjusting the open degree of an electronic expansion valve; (S3) when the automobile is stopped, enabling an engine and a compressor to stop rotating; after the automobile is stopped, and enabling the electronic expansion valve to have a certain open degree to control the right amount of refrigerant to flow into an evaporator, wherein the refrigerant can be used for absorbing heat when being evaporated by the evaporator so as to delay the outlet air temperature rise time in the automobile. The automobile air-conditioning system and the control method of the automobile air-conditioning system can be realized only by changing the running way based on the existing air-conditioning system, are simple to operate and avoid the extra cost caused by newly added parts or materials.
Description
Technical field
The present invention relates to a kind of automotive air-conditioning system and control method thereof, relate in particular to a kind of automotive air-conditioning system and control method thereof when being applied to automobile and being about to stop and after stopping.
Background technology
Electric expansion valve has been widely used in domestic air conditioning field as a kind of novel throttle unit.Electric expansion valve can change flexibly according to the requirement of system the refrigerant flow of a/c system, realizes the effective control to degree of superheating, thereby realizes the raising of the usefulness of system.Electric expansion valve is a kind of by the motion of stepper motor driven valve core, by aciculiform spool opening, the size of adjustment valve port, thereby the mechanism of adjustment refrigerant flow.The key that electric expansion valve is effectively used is the control logic of electric expansion valve, how according to system requirements, the aperture of electric expansion valve to be controlled.
In family expenses, business air conditioner, because system condition is more stable, effective for the control method comparative maturity of a/c system.And for automotive air-conditioning system, due to the environment for use of Automobile Complex, for the control of electric expansion valve, also have higher requirement.Particularly current, along with the requirement of vehicle energy saving is more and more higher, a lot of American-European countries put into effect laws and regulations, require automobile engine off in the process of waiting for traffic lights.Because automobile air conditioner compressor is subject to engine drive, thus engine off to bring a problem be exactly that air-conditioning cannot freeze simultaneously, this will affect occupant's comfort level.A/c system and parts developer thereof are all making great efforts to improve design, to maintain the refrigerating capacity of automobile in engine shutdown process.
For realizing automobile, in engine stop process, still can keep certain refrigerating capacity, each a/c system and parts development business are making great efforts the various technology of exploitation, and the system of maintaining possesses certain refrigerating capacity.And wherein the most popular a kind of way is design a kind of what is called " Stop-Stay evaporator ".The principle of this evaporator is to have one deck heat storage material at evaporator surface, in normal process of refrigerastion, cold is put aside at evaporator surface; After compressor shutdown, the cold of savings in evaporation discharges, and passes to air, realizes the refrigeration to compartment.
Objectively, this " Stop-Stay evaporator " can maintain the refrigerating capacity of a period of time, the refrigeration while playing engine off.Yet undeniable, the heat storage material of this " Stop-Stay evaporator " needs to increase greatly material cost; In addition; for evaporator; the temperature of evaporator is also limited by the temperature of internal refrigeration storage agent; for tradition, adopt the refrigeration system that heating power expansion valve is throttle mechanism; after compressor shutdown; high-pressure refrigerant in condenser is discharged into rapidly low tension terminal, causes the refrigerant temperature in evaporator to raise rapidly, thereby has influence on the cooling performance of the evaporator under stopped status.
Therefore, be necessary existing technology to improve, to overcome above technical matters.
Summary of the invention
The object of the present invention is to provide a kind of lower-cost automotive air-conditioning system and control method thereof, after parking of automobile, still can produce certain refrigerating capacity.
For solving, realize above-mentioned purpose, the present invention adopts following technical scheme: a kind of control method of automotive air-conditioning system, it comprises the steps:
S1) judge whether automobile is about to stop;
S2) when automobile is about to stop, conditioning control unit is carried out parking control logic, adjusts the opening of electric expansion valve;
S3), when parking of automobile, driving engine and compressor all stop operating; After parking of automobile, automotive air-conditioning system is interior circulation, and described electric expansion valve has certain opening and flows into evaporator to control refrigerant, and described refrigerant absorbs heat to postpone the rising time of leaving air temp in car by this evaporator evaporation.
As further improved technical scheme of the present invention, step S2) in, when described conditioning control unit is carried out parking control logic, increase the opening of electric expansion valve, step S3) in the opening of electric expansion valve be less than step S2) in the opening of electric expansion valve.
As further improved technical scheme of the present invention, described compressor is variable compressor, and it is at step S2) in, improve the discharge capacity of compressor refrigerant is compressed.
As further improved technical scheme of the present invention, described conditioning control unit comprises a judge module, step S1) in, this judge module comprehensively judges according to the speed of a motor vehicle, acceleration/accel and brake situation whether automobile is about to stop.
As further improved technical scheme of the present invention, step S2) and step S3) between also comprise and further judge that whether automobile is about to the step of stopping really, if wherein the speed of a motor vehicle does not arrive zero yet within the predetermined time, described conditioning control unit is abandoned the control logic of stopping, and returns to normal control logic.
As further improved technical scheme of the present invention, step S1) in, think that the judgement that automobile is about to stop comprises that definite brake is operated; Described step S3) also comprise the steps: afterwards
S4) in car leaving air temp higher than certain setting value after, restart compressor.
As further improved technical scheme of the present invention, step S3) in, after compressor shutdown, to fix that the opening of a certain percentum is opened described electric expansion valve until leaving air temp higher than certain setting value.
As further improved technical scheme of the present invention; step S3) in; after compressor shutdown; first to fix the opening of the first percentum, open described electric expansion valve and maintain the regular hour, and then to fix that the opening of the second percentum is opened this electric expansion valve until leaving air temp higher than certain setting value.
As further improved technical scheme of the present invention; step S3) in, after compressor shutdown, the linear or nonlinear relationship of the opening of described electric expansion valve and leaving air temp; and adjust in real time the opening of this electric expansion valve, until leaving air temp is higher than certain setting value.
For solving, realize above-mentioned purpose, the present invention can also adopt following technical scheme: a kind of automotive air-conditioning system, it comprises: compressor, evaporator, electric expansion valve, condenser and in order to control the conditioning control unit of compressor, electric expansion valve and evaporator, described conditioning control unit is controlled described automotive air-conditioning system according to above-mentioned control method.
Compared with prior art, the present invention can be after engine shutdown, described electric expansion valve has certain opening and flows into evaporator to control refrigerant, described refrigerant absorbs heat to postpone the rising time of leaving air temp in car by this evaporator evaporation, has met the required refrigeration requirement of cooling control under engine shutdown state; In addition, the present invention only need to change its operation scheme on the basis of existing a/c system, simple to operate, the extra cost of having avoided newly-increased parts or material to produce.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of automotive air-conditioning system of the present invention;
Fig. 2 is the schematic diagram of the control method of automotive air-conditioning system of the present invention, wherein usings the speed of a motor vehicle as main reference frame;
Fig. 3 is the opening of electric expansion valve and the leaving air temp diagram of curves while reaching certain setting value;
Fig. 4 is the block diagram of the control method of automotive air-conditioning system of the present invention.
The specific embodiment
Fig. 1 has shown automotive air-conditioning system 100 of the present invention, and it comprises: electric expansion valve 1, the evaporator 2 that is connected in electric expansion valve 1, the evaporator 2 being connected in and in order to control the compressor 3 of evaporator 2 internal pressures, the condenser 4 that is connected in compressor 3 and conditioning control unit 5.Described electric expansion valve 1 is in order to throttling, to control the amount that flows into evaporator 2 inner refrigerants.Described conditioning control unit 5 is connected with electric expansion valve 1, evaporator 2 and compressor 3 respectively, so that they are played to control action.During automobile normal running, described compressor 3 can be driven by the driving engine of automobile (not shown), and then whole automotive air-conditioning system 100 can be turned round smoothly.
Shown in please refer to the drawing 2 and Fig. 4, the control method of automotive air-conditioning system of the present invention comprises the steps:
S1) judge whether automobile is about to stop;
S2) when automobile is about to stop, conditioning control unit 5 sends instruction and carries out parking control logic, adjusts the opening of electric expansion valve 1;
S3), when parking of automobile, the compressor 3 of the driving engine of automobile and automotive air-conditioning system 100 all stops operating; After parking of automobile, automotive air-conditioning system is interior circulation, and described electric expansion valve 1 has certain opening and flows into evaporator 2 to control refrigerant, and described refrigerant is the rising time with leaving air temp in delay car by these evaporator 2 evaporation endothermics.
Particularly, step S1) in, by the judge module in conditioning control unit 5 (not shown), judge whether automobile is about to stop.Certainly, in other embodiments, also can judge first whether automobile is about to stop by vehicle-mounted chip unit (not shown), and then the signal that automobile is about to stop passes to conditioning control unit 5.
Further, above-mentioned steps S1) in, the judgement that automobile is about to stop includes but not limited to following situation: within a certain short period, for example, when from a certain higher numerical value (, finding the speed of a motor vehicle
40km/h) be reduced to rapidly a certain lower numerical value and (for example,, in the time of 20km/h), think that automobile is about to stop.Step S1) in, think that the judgement that automobile is about to stop comprises that definite brake is operated, that is to say, generally, slamming brake is to think that automobile is about to the precondition of stopping.Certainly, for different road conditions, to above-mentioned steps S1) in the decision logic that adopts of the automobile judgement of whether stopping can be different.For instance, if automobile within the time of a certain reasonable length all in height motoring condition (can think that automobile is at running on expressway), now, automobile is within a certain shorter time, the speed of a motor vehicle and pickup decline rapidly, if the speed of a motor vehicle is during lower than a certain threshold values, and brake is operated, and can think that automobile is about to stop; If automobile speed all fluctuates up and down at a certain lower numerical value within the time of a certain reasonable length (can think the situation that automobile blocking up under travel), now, although the speed of automobile itself is also unhappy, but, as long as automobile is within a certain shorter time, when the speed of a motor vehicle drops to lower than a certain threshold values, and brake is operated, and can think that automobile be about to stop.On the contrary, if throttle is operated, even if meet speed adjusting, is not also thought and entered car-parking model.If brake and throttle are not all operated, the condition when condition that judgement is about to stop need to be operated than brake is harsher, such as brake, stepping on the speed threshold values that enters car-parking model is 20km/h, and do not step on the threshold values that enters car-parking model, need to be 10km/h or 5km/h, even lower.
In sum, step S1) in, the judge module of conditioning control unit 5 can comprehensively judge whether automobile is about to stop according to the speed of a motor vehicle, acceleration/accel and brake situation.The size of the described speed of a motor vehicle and brake signal pass to conditioning control unit 5 by LIN line.Described acceleration/accel is that conditioning control unit 5 draws by calculating the variation of the speed of a motor vehicle.Certainly, in other embodiments, vehicle-mounted chip unit also can comprehensively judge whether automobile is about to stop, and the signal that then whether automobile is about to stop passes to conditioning control unit 5 according to the speed of a motor vehicle, acceleration/accel and brake situation.
It should be noted that: about above-mentioned steps S1) in the automobile judgement of whether stopping not be emphasis of the present invention, above-mentioned for example just for a better understanding of the present invention, limitation of the present invention absolutely not.
Above-mentioned steps S2) in, the opening of adjusting electric expansion valve 1 comprises two kinds of modes, that is: reduce the opening of electric expansion valve 1 or increase the opening of electric expansion valve 1, the opening that wherein reduces electric expansion valve 1 is that degree of saturation specific humidity, the prolongation refrigerant in order to slow down evaporator 2 inner refrigerants enters the time in evaporator 2, thereby plays the object that extends cooling time; The opening that increases electric expansion valve 1 is in order to deposit more liquid refrigerant in evaporator 2, to extend evaporation time, thereby plays the object that extends cooling time.Although two kinds of modes of the opening of above-mentioned adjustment electric expansion valve 1 are diverse, the thinking angle of these two kinds of modes is also different, is all feasible.
Described compressor 3 is variable compressor, and it is at step S2) in, improve the discharge capacity of compressor 3 refrigerant is compressed, thereby can store more refrigerant at high-pressure side.In this case, when parking of automobile, after unlocking electronic expansion valve 1, thereby can allow more refrigerant flow into evaporator 2, extend cooling time.Step S2), in, under the mode of opening that increases electric expansion valve 1, the rotating speed of described conditioning control unit 5 control engines maintains current rotating speed, and maintains power-transfer clutch adhesive.Open large electric expansion valve 1 to applicable position, the pressure in evaporator 2 is for example, during lower than a certain numerical value (, 0.25 MPa), and the power-transfer clutch of compressor 3 disconnects, and waits for and receives parking of automobile instruction.Preferably, the pressure in evaporator 2 for example,, lower than a certain numerical value (, 0.25 MPa), when the power-transfer clutch of compressor 3 disconnects, is closed electric expansion valve 1, stops refrigerant being discharged into evaporator 2.
Above-mentioned steps S3) in, after parking of automobile, described electric expansion valve 1 has certain opening and flows into evaporator 2 to control the refrigerant of suitable amount, " electric expansion valve 1 has certain opening " mentioned here can after parking of automobile, open immediately or after parking of automobile, spent a period of time after open again.Step S3) in, the opening of electric expansion valve 1 is less than step S2) in the opening of electric expansion valve 1 under the mode of opening that increases electric expansion valve 1 so that after parking of automobile, extend as far as possible cooling time.
Be understandable that: above-mentioned steps S2) and step S3) between also comprise and further judge that whether automobile is about to the step of stopping really.Shown in curve A in please refer to the drawing 2, if further detected after the speed of a motor vehicle, find that the speed of a motor vehicle is zero (stopping), setting up procedure S3); Shown in curve C in please refer to the drawing 2, if further detect after the speed of a motor vehicle, find the speed of a motor vehicle within the predetermined time (for example 20 seconds) does not arrive yet and zeroly (can think the traffic congestion state of automobile in low cruise, not need to stop), abandon the control logic of stopping, return to normal control logic; Certainly, even if automotive air-conditioning system 100 has returned to normal control logic, the detection of the speed of a motor vehicle still exists, once the speed of a motor vehicle is zero, closes electric expansion valve 1 completely; Shown in curve B in please refer to the drawing 2, if further detect after the speed of a motor vehicle, find that near speed of a motor vehicle fluctuation up and down second value (20km/h) always (can think the traffic congestion state of automobile in low cruise, not need to stop), now further detect the speed of a motor vehicle, once the speed of a motor vehicle is zero, closes electric expansion valve 1 completely.Under the situation shown in curve B and curve C, when the speed of a motor vehicle is zero, the object of closing electric expansion valve 1 is completely for return, and then makes following step S3) in can control more accurately the opening of electric expansion valve 1.
Step S3), in, according to the opening of certain regular unlocking electronic expansion valve 1, control the refrigerant of applicable inflow evaporator 2, avoid evaporator 2 internal pressures too high, simultaneously according to heat exchange demand, enough refrigerants, by evaporation endothermic, postpone as far as possible the rising time of leaving air temp in car.The rule of opening described electric expansion valve 1 step S3) is that fix or variable, for example, can carry out according to following rule:
Rule one: after compressor 3 is shut down, for example, to fix that the opening of a certain percentum (10%) is opened described electric expansion valve 1 until leaving air temp higher than certain setting value.Fig. 3 is the diagram of curves while reaching certain setting value through the opening of electric expansion valve of test and leaving air temp, from figure, can find out, there is a best opening percentum, make leaving air temp arrive time of setting value the longest, but this best opening percentum and heat exchanger capacity, the many factors such as design temperature that reach are relevant.Preferably, using setting value as 18 ℃ as experiment value, adopt the method for rule one to control resulting electric expansion valve 1 under different opening, required time when air themperature reaches 18 ℃, as can be seen from Figure 3, optimum aperture is 50 steps (stepping motor of controlling electric expansion valve 1 has been walked 50 steps), and the time that reaches 18 ℃ is the longest, is 45 seconds.It should be noted that, " fixing a certain percentum " described in rule one is a relative concept, the percentum that refers to unlocking electronic expansion valve 1 under a kind of operating mode is fixed, that is to say the percentum of (for example the temperature of automobile external is different) unlocking electronic expansion valve 1 or different under different operating modes.
Rule two: after compressor 3 is shut down; first for example, to fix the opening of the first percentum (10%), open described electric expansion valve 1 and maintain the regular hour, and then with the opening of the second percentum (for example 30%) open this electric expansion valve 1 until leaving air temp higher than certain setting value.It should be noted that, " fixing the first percentum " and " fixing the second percentum " described in rule two is also a relative concept, referring to first, second percentum of unlocking electronic expansion valve 1 under a kind of operating mode fixes, that is to say first, second percentum of (for example the temperature of automobile external is different) unlocking electronic expansion valve 1 or different under different operating modes.
Rule three: after compressor 3 is shut down, the linear or nonlinear relationship of the aperture of described electric expansion valve 1 and leaving air temp, and adjust in real time the opening of this electric expansion valve 1, until leaving air temp is higher than certain setting value.
Step S3) in, the opening of electric expansion valve is less than step S2) in the opening of electric expansion valve.Reason is: step S2), the opening that increases electric expansion valve is in order to store in the short period of time more refrigerant.Step S3) in, the opening of electric expansion valve is less than step S2) in the opening of electric expansion valve, refrigerant release guarantee extends cooling time relatively slowly.
Described step S3) also comprise the steps: afterwards S4) in car leaving air temp higher than certain setting value after, restart compressor, to start the a/c system under normal mode.
In sum, the present invention is when parking of automobile, although driving engine and compressor all stop operating, but because described electric expansion valve 1 has certain opening, still have refrigerant to flow into evaporator 2, described refrigerant is the rising time with leaving air temp in delay car by these evaporator 2 evaporation endothermics.That is to say, at step S3) in, for example, even if the driving engine of automobile does not turn round (automobile is in waiting for the halted state of traffic lights), automotive air-conditioning system 100 still can be realized refrigeration.In addition, at step S2) in increase electric expansion valve 1 opening be in order to deposit more liquid refrigerant in evaporator 2, to extend evaporation time, thereby play the object that extends cooling time.In sum, control method of the present invention only need to be based upon on existing automotive air-conditioning system, and control method is simple, does not need additionally to increase spare part or material, has greatly reduced cost.
It should be noted that: above embodiment is only for illustrating the present invention and unrestricted technical scheme described in the invention, although this specification sheets has been described in detail the present invention with reference to the above embodiments, but, those of ordinary skill in the art is to be understood that, person of ordinary skill in the field still can modify or be equal to replacement the present invention, and all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, all should be encompassed within the scope of claim of the present invention.
Claims (10)
1. a control method for automotive air-conditioning system, is characterized in that, this control method comprises the steps:
S1) judge whether automobile is about to stop;
S2) when automobile is about to stop, conditioning control unit is carried out parking control logic, adjusts the opening of electric expansion valve;
S3), when parking of automobile, driving engine and compressor all stop operating; After parking of automobile, automotive air-conditioning system is interior circulation, and described electric expansion valve has certain opening and flows into evaporator to control refrigerant, and described refrigerant absorbs heat to postpone the rising time of leaving air temp in car by this evaporator evaporation.
2. the control method of automotive air-conditioning system as claimed in claim 1, it is characterized in that: step S2), when described conditioning control unit is carried out parking control logic, increase the opening of electric expansion valve, step S3) in the opening of electric expansion valve be less than step S2) in the opening of electric expansion valve.
3. the control method of automotive air-conditioning system as claimed in claim 2, is characterized in that: described compressor is variable compressor, and it is at step S2) in, improve the discharge capacity of compressor refrigerant is compressed.
4. the control method of automotive air-conditioning system as claimed in claim 1, it is characterized in that: described conditioning control unit comprises a judge module, step S1), in, this judge module comprehensively judges according to the speed of a motor vehicle, acceleration/accel and brake situation whether automobile is about to stop.
5. the control method of the automotive air-conditioning system as described in claim 1,2,3 or 4, it is characterized in that: step S2) and step S3) between also comprise and further judge that whether automobile is about to the step of stopping really, if wherein the speed of a motor vehicle does not arrive zero yet within the predetermined time, described conditioning control unit is abandoned the control logic of stopping, and returns to normal control logic.
6. the control method of the automotive air-conditioning system as described in claim 1,2,3 or 4, is characterized in that: step S1), think that the judgement that automobile is about to stop comprises that definite brake is operated; Described step S3) also comprise the steps: afterwards
S4) in car leaving air temp higher than certain setting value after, restart compressor.
7. the control method of the automotive air-conditioning system as described in claim 1,2,3 or 4, is characterized in that: step S3), after compressor shutdown, to fix that the opening of a certain percentum is opened described electric expansion valve until leaving air temp higher than certain setting value.
8. the control method of the automotive air-conditioning system as described in claim 1,2,3 or 4; it is characterized in that: step S3); after compressor shutdown; first to fix the opening of the first percentum, open described electric expansion valve and maintain the regular hour, and then to fix that the opening of the second percentum is opened this electric expansion valve until leaving air temp higher than certain setting value.
9. the control method of the automotive air-conditioning system as described in claim 1,2,3 or 4; it is characterized in that: step S3); after compressor shutdown; linear or the nonlinear relationship of the opening of described electric expansion valve and leaving air temp; and adjust in real time the opening of this electric expansion valve, until leaving air temp is higher than certain setting value.
10. an automotive air-conditioning system, it is characterized in that, described automotive air-conditioning system comprises: compressor, evaporator, electric expansion valve, condenser and in order to control the conditioning control unit of compressor, electric expansion valve and evaporator, described conditioning control unit is controlled described automotive air-conditioning system according to the control method described in any one in claim 1 to 9.
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| CN106183702A (en) * | 2014-12-10 | 2016-12-07 | 现代自动车株式会社 | The method controlling automotive air-conditioning system |
| CN109747380A (en) * | 2018-12-29 | 2019-05-14 | 大乘汽车有限公司 | A kind of control system and method for vehicle air conditioning |
| CN111267582A (en) * | 2020-03-19 | 2020-06-12 | 滁州市爱科知识产权代理有限公司 | Displacement control method for automobile air conditioner compressor |
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| CN111267582A (en) * | 2020-03-19 | 2020-06-12 | 滁州市爱科知识产权代理有限公司 | Displacement control method for automobile air conditioner compressor |
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