CN103568776B - Automobile air-conditioning system and control method thereof - Google Patents
Automobile air-conditioning system and control method thereof Download PDFInfo
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- CN103568776B CN103568776B CN201210276586.5A CN201210276586A CN103568776B CN 103568776 B CN103568776 B CN 103568776B CN 201210276586 A CN201210276586 A CN 201210276586A CN 103568776 B CN103568776 B CN 103568776B
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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 its control method, more particularly to one kind is applied to automobile and will stop
When and stop after automotive air-conditioning system and its control method.
Background technology
Electric expansion valve is had been widely used in domestic field of air conditioning as a kind of new restricting element.Electric expansion valve can
Flexibly to change the refrigerant flow of air conditioning system according to the requirement of system, the effective control to the degree of superheat is realized, so as to realize
The raising of the efficiency of system.Electric expansion valve is a kind of by the motion of stepper motor driven valve core, by aciculiform valve element open degree, is adjusted
The size of whole valve port, so as to adjust the mechanism of refrigerant flow.What electric expansion valve was effectively used it is critical only that electric expansion valve
Control logic, i.e., how the aperture of electric expansion valve to be controlled according to system requirements.
In domestic, business air conditioner, due to system condition it is more stable, for the control method comparative maturity of air conditioning system
Effectively.And for automotive air-conditioning system, due to the use environment of Automobile Complex, for electric expansion valve control it is also proposed that
Higher requirement.Particularly current, with the requirement more and more higher of vehicle energy saving, many American-European countries put into effect laws and regulations,
Require automobile engine misses during traffic lights are waited.Because automobile air conditioner compressor receives engine driving, therefore send out
Motivation is flame-out to bring a problem to be exactly that air-conditioning cannot freeze simultaneously, and this will affect occupant's comfort level.Air conditioning system and
Its parts developer is making great efforts Curve guide impeller, to maintain refrigerating capacity of the automobile in electromotor stopping process.
To realize that automobile still can keep certain refrigerating capacity, each air conditioning system and portion during engine stop
Part developer is making great efforts to develop various technologies, and maintenance system possesses certain refrigerating capacity.And a kind of wherein popular way
It is that design is a kind of so-called " Stop-Stay vaporizers ".The principle of this vaporizer is that have one layer of accumulation of heat material in evaporator surface
Material, in normal process of refrigerastion, cold is put aside in evaporator surface；After compressor shutdown, put aside cold in evaporation
Amount is discharged, and passes to air, realizes the refrigeration to compartment.
Objectively, this " Stop-Stay vaporizers " is able to maintain that the refrigerating capacity of a period of time, when playing engine misses
Refrigeration.However, undeniably, the heat-storing material of this " Stop-Stay vaporizers " need greatly to increase material into
This；In addition, for vaporizer, the temperature of vaporizer is subject to the temperature of internal refrigeration storage agent, for conventionally employed heating power
Expansion valve is the refrigeration system of throttle mechanism, and after compressor shutdown, the high-pressure refrigerant in condenser is promptly released into low
Pressure side, causes the refrigerant temperature in vaporizer to raise rapidly, so as to have influence on stopped status under vaporizer cooling effect.
Therefore, it is necessary to existing technology is improved, to overcome above technical problem.
The content of the invention
It is an object of the invention to provide a kind of lower-cost automotive air-conditioning system and its control method, work as parking of automobile
Certain refrigerating capacity can be still produced afterwards.
To solve to realize above-mentioned purpose, the present invention is adopted the following technical scheme that：A kind of control method of automotive air-conditioning system,
It comprises the steps：
S1) judge whether automobile will stop；
S2) when automobile will stop, conditioning control unit performs parking toll logic, adjusts opening for electric expansion valve
Qi Du；
S3) when parking of automobile, electromotor and compressor stop operating；After parking of automobile, automotive air-conditioning system is interior
Circulation, the electric expansion valve has certain open degree and flows into vaporizer to control cold-producing medium, and the cold-producing medium is by the steaming
Send out device evaporation endothermic to postpone the rise time of in-car leaving air temp.
As further improved technical scheme of the present invention, step S2) in, the conditioning control unit performs parking toll
During logic, increase electric expansion valve open degree, step S3) in electric expansion valve open degree be less than step S2) in electronics it is swollen
The open degree of swollen valve.
Used as further improved technical scheme of the present invention, the compressor is variable compressor, and it is in step S2)
In, the discharge capacity for improving compressor is compressed to cold-producing medium.
Used as further improved technical scheme of the present invention, the conditioning control unit includes a judge module, step
S1 in), whether the judge module will stop according to speed, acceleration and braking conditions come comprehensive descision automobile.
As further improved technical scheme of the present invention, step S2) and step S3) between also include determine whether vapour
The step of whether car will stop really, if wherein within the predetermined time speed does not reach yet zero, the airconditioning control
Unit abandons parking toll logic, backs within normal control logic.
As further improved technical scheme of the present invention, step S1) in, it is believed that the judgement that automobile will stop includes true
Fixed brake has been operated；Step S3) also comprise the steps afterwards：
S4) after in-car leaving air temp is higher than certain setting value, compressor is restarted.
As further improved technical scheme of the present invention, step S3) in, after compressor shutdown, with a certain percentage of fixation
The open degree of ratio opens the electric expansion valve until leaving air temp is higher than certain setting value.
As further improved technical scheme of the present invention, step S3) in, after compressor shutdown, first fixing the 100th
The open degree of point ratio is opened the electric expansion valve and maintains the regular hour, then again fixing the open degree of the second percentage ratio
The electric expansion valve is opened until leaving air temp is higher than certain setting value.
As further improved technical scheme of the present invention, step S3) in, after compressor shutdown, the electric expansion valve
Open degree and leaving air temp is linear or non-linear relation, and the open degree of the real-time adjustment electric expansion valve, directly
It is higher than certain setting value to leaving air temp.
To solve to realize above-mentioned purpose, the present invention can also be adopted the following technical scheme that：A kind of automotive air-conditioning system, its bag
Include：Compressor, vaporizer, electric expansion valve, condenser and the air-conditioning control to control compressor, electric expansion valve and vaporizer
Unit processed, the conditioning control unit is controlled according to above-mentioned control method to the automotive air-conditioning system.
Compared with prior art, the present invention can after engine stop, and the electric expansion valve has certain unlatching
Degree flows into vaporizer to control cold-producing medium, and the cold-producing medium absorbs heat to postpone the liter of in-car leaving air temp by the evaporator evaporation
The high time, meet the refrigeration under engine off condition needed for cooling control and require；In addition, the present invention is only needed in existing sky
Change its method of operation on the basis of adjusting system, it is simple to operate, it is to avoid extra produced by newly-increased parts or material
Cost.
Description of the drawings
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 using speed as Primary Reference foundation；
Curve chart when Fig. 3 is the open degree of electric expansion valve and leaving air temp reaches certain setting value；
The step of Fig. 4 is the control method of automotive air-conditioning system of the present invention is schemed.
Specific embodiment
Fig. 1 shows the automotive air-conditioning system 100 of the present invention, and it includes：Electric expansion valve 1, it is connected to electric expansion valve 1
Vaporizer 2, the vaporizer 2 that is connected to and to control the compressor 3 of pressure in vaporizer 2, be connected to the condensation of compressor 3
Device 4 and conditioning control unit 5.The electric expansion valve 1 to throttle, with control flow into the inner refrigerant of vaporizer 2 amount.
The conditioning control unit 5 is connected respectively with electric expansion valve 1, vaporizer 2 and compressor 3, to play control action to them.
During automobile normal running, the compressor 3 by the drive (not shown) of the electromotor of automobile, and then can make whole air conditioning for automobiles system
System 100 can smoothly operate.
Please join shown in Fig. 2 and Fig. 4, the control method of automotive air-conditioning system of the present invention comprises the steps：
S1) judge whether automobile will stop；
S2) when automobile will stop, conditioning control unit 5 sends and instructs and perform parking toll logic, adjusts electronics
The open degree of expansion valve 1；
S3) when parking of automobile, the electromotor of automobile and the compressor 3 of automotive air-conditioning system 100 stop operating；Vapour
After car stops, automotive air-conditioning system is interior circulation, and the electric expansion valve 1 has certain open degree to control cold-producing medium inflow
Vaporizer 2, the cold-producing medium passes through the evaporation endothermic of vaporizer 2 to postpone the rise time of in-car leaving air temp.
Specifically, step S1) in, whether automobile is judged by the judge module (not shown) in conditioning control unit 5
Will stop.Certainly, in other embodiments, it is also possible to which whether automobile is judged by vehicle-mounted chip unit (not shown) first
Will stop, the signal transmission that then automobile will be stopped again is to conditioning control unit 5.
Further, above-mentioned steps S1) in, the judgement that automobile will stop includes but is not limited to following situation：A certain
In short period, when find speed from a certain higher numerical value (for example,40km/h) it is rapidly reduced to a certain relatively low numerical value
When (for example, 20km/h), it is believed that automobile will stop.Step S1) in, it is believed that the judgement that automobile will stop includes determining brake
It has been operated, that is to say, that generally, it is to think the precondition that automobile will stop to slam brake.Certainly, for
Different road conditions, to above-mentioned steps S1) in the decision logic that adopted of the judgement whether stopped of automobile can be different.Citing
For, if automobile is in height transport condition (it is considered that automobile is on a highway within the time of a certain reasonable length
Traveling), now, within a certain shorter time, speed and pickup decline rapidly automobile, if speed is less than a certain threshold values
When, and brake be operated, then it is considered that automobile will stop；If automobile speed is within the time of a certain reasonable length at certain
One relatively low numerically lower fluctuation (it is considered that the situation downward driving of automobile in congestion), now, although the speed of automobile itself
And it is unhappy, but, as long as automobile is within a certain shorter time, when speed is decreased below a certain threshold values, and brake is operated,
Then it is considered that automobile will stop.Conversely, if throttle is operated, also it is not considered as into parking even if meeting speed and adjusting
Pattern.If brake and throttle are not all operated, judge that the condition that will be stopped needs condition when being operated than brake
Harsher, such as the speed threshold that brake steps on into car-parking model is 20km/h, and does not step on the threshold values into car-parking model
It is 10km/h or 5km/h to need, even lower.
In sum, step S1) in, the judge module of conditioning control unit 5 can be according to speed, acceleration and brake feelings
Condition comes whether comprehensive descision automobile will stop.The size and brake signal of the speed passes to airconditioning control by LIN lines
Unit 5.The acceleration is that conditioning control unit 5 is drawn by calculating the change of speed.Certainly, in other embodiment
In, whether vehicle-mounted chip unit also be able to will stop according to speed, acceleration and braking conditions come comprehensive descision automobile, then
By automobile, whether the signal transmission that will be stopped is to conditioning control unit 5.
It should be noted that：With regard to above-mentioned steps S1) in automobile whether stop judge and non-invention emphasis, it is above-mentioned
Citing is intended merely to be better understood from the present invention, absolutely not limitation of the present invention.
Above-mentioned steps S2) in, adjusting the open degree of electric expansion valve 1 includes two ways, i.e.,：Reduce electric expansion valve 1
Open degree or increase electric expansion valve 1 open degree, wherein reduce electric expansion valve 1 open degree be to slow down evaporation
The time that the saturation of the inner refrigerant of device 2, prolongation cold-producing medium are entered in vaporizer 2, so as to play the purpose for extending cooling time；
The open degree of increase electric expansion valve 1 be for the more liquid refrigerants of storage in the vaporizer 2, to extend evaporation time,
So as to play the purpose for extending cooling time.Although the two ways of the open degree of above-mentioned adjustment electric expansion valve 1 is completely not
With, but the thinking angle of both modes is also different, is all feasible.
The compressor 3 is variable compressor, and it is in step S2) in, improve the discharge capacity of compressor 3 is carried out to cold-producing medium
Compression such that it is able to store more cold-producing mediums in high-pressure side.In this case, when parking of automobile, electronic expansion is opened
After valve 1, more cold-producing mediums can be allowed to flow into vaporizer 2 so as to extend cooling time.Step S2) in, in increase electronic expansion
Under the mode of the open degree of valve 1, the rotating speed of the control electromotor of the conditioning control unit 5 maintains current rotating speed, and maintain from
Clutch adhesive.Big electric expansion valve 1 is opened to suitable position, when the pressure in vaporizer 2 is less than a certain numerical value (for example, 0.25
When MPa), the clutch of compressor 3 disconnects, and waits parking of automobile to be received to instruct.Preferably, when the pressure in vaporizer 2 is less than
A certain numerical value (for example, 0.25 MPa), when the clutch of compressor 3 disconnects, closes electric expansion valve 1, and cold-producing medium is released in stopping
It is put into vaporizer 2.
Above-mentioned steps S3) in, after parking of automobile, there is the electric expansion valve 1 certain open degree to control suitable amount
Cold-producing medium flow into vaporizer 2, referred to herein as " electric expansion valve 1 have certain open degree " can stand after parking of automobile
Open or be then turned on after a period of time has been spent after parking of automobile.Step S3) in electric expansion valve 1 open degree less than step
Rapid S2) in electric expansion valve 1 under the mode of the open degree of increase electric expansion valve 1 open degree, so as in parking of automobile
Afterwards, cooling time is extended as far as possible.
It is understandable that：Above-mentioned steps S2) and step S3) between also include determine whether whether automobile really will
The step of parking.Please join shown in the curve A in Fig. 2, if further after detection speed, it is found that speed is zero (stopping), then
Starting step S3)；Please join shown in the curve C in Fig. 2, if further finding speed within the predetermined time after detection speed
(such as 20 seconds) reach yet zero (it is believed that automobile is in the traffic congestion state of low cruise, and non-required is stopped), then abandon stopping
Car control logic, backs within normal control logic；Certainly, even if automotive air-conditioning system 100 has been backed within normally
Control logic, the detection of speed is still present, once speed is zero, then completely closes electric expansion valve 1；Please join the song in Fig. 2
Shown in line B, if further after detection speed, always up and down fluctuation (can be recognized near second value (20km/h) to find speed
Stop for traffic congestion state of the automobile in low cruise, and non-required), speed is now further detected, once speed is zero, then
Completely close electric expansion valve 1.In the case of shown in curve B and curve C, when speed is zero, electronic expansion is completely closed
The purpose of valve 1 be for return, and then make following step S3) in can more accurately control the unlatching of electric expansion valve 1
Degree.
Step S3) in, the open degree of electric expansion valve 1 is opened according to certain rule, control suitable inflow vaporizer 2
Cold-producing medium, it is to avoid hypertonia in vaporizer 2, while according to heat exchange demand, enough cold-producing mediums, by evaporation endothermic, to the greatest extent
The rise time of in-car leaving air temp may be postponed.Step S3) in open the electric expansion valve 1 rule be it is fixed or
Variable, for example can carry out according to following rule：
Rule one：After compressor 3 is shut down, with a certain percentage ratio of fixation（Such as 10%）Open degree to open the electronics swollen
Swollen valve 1 is until leaving air temp is higher than certain setting value.Fig. 3 is that the open degree of the electric expansion valve through testing reaches with leaving air temp
Curve chart during certain setting value, it can be seen that there is an optimal open degree percentage ratio from figure, reaches leaving air temp and sets
The time of definite value is most long, but this optimal open degree percentage ratio and heat exchanger capacity, the design temperature that reached etc. it is various because
Have pass.Preferably, using setting value as 18 DEG C as experiment value, the electronics obtained by being controlled using the method for rule one is swollen
Under different opening, air themperature reaches the time required when 18 DEG C to swollen valve 1, from figure 3, it can be seen that the aperture of optimum is 50
Step (motor for controlling electric expansion valve 1 has walked 50 steps), the time for reaching 18 DEG C is most long, is 45 seconds.Need explanation
It is that " a certain percentage ratio of fixation " described in rule one is a relative concept, refers to open electronics under a kind of operating mode
The percentage ratio of expansion valve 1 is fixed, that is to say, that (temperature of such as automobile external is different) open electricity under different operating modes
The percentage ratio of sub- expansion valve 1 or different.
Rule two：After compressor 3 is shut down, first fixing the first percentage ratio（Such as 10%）Open degree open the electronics
Expansion valve 1 simultaneously maintains the regular hour, then again with the second percentage ratio（Such as 30%）Open degree open the electric expansion valve 1
Until leaving air temp is higher than certain setting value.It should be noted that " fixing the first percentage ratio " described in rule two and " fixing the
Two percentage ratios " are also a relative concept, refer to open first, second percentage of electric expansion valve 1 under a kind of operating mode
Than being fixed, that is to say, that the temperature of automobile external (such as different) opens the of electric expansion valve 1 under different operating modes
First, the second percentage ratio or different.
Rule three：After compressor 3 is shut down, the aperture and leaving air temp of the electric expansion valve 1 is linear or non-
Linear relationship, and the open degree of the real-time adjustment electric expansion valve 1, until leaving air temp is higher than certain setting value.
Step S3) in electric expansion valve open degree be less than step S2) in electric expansion valve open degree.Reason for this is that：
Step S2) in, the open degree for increasing electric expansion valve is to store more cold-producing mediums in the short period of time.Step S3)
The open degree of middle electric expansion valve be less than step S2) in electric expansion valve open degree, relatively slow refrigerant release ability
Ensure to extend cooling time.
Step S3) also comprise the steps afterwards：S4) after in-car leaving air temp is higher than certain setting value, again
Start compressor, to start normal mode under air conditioning system.
In sum, the present invention is when parking of automobile, although electromotor and compressor stop operating, but due to described
Electric expansion valve 1 has certain open degree, still has cold-producing medium to flow into vaporizer 2, and the cold-producing medium is steamed by the vaporizer 2
Send out heat absorption to postpone the rise time of in-car leaving air temp.That is, in step S3) in, even if the electromotor of automobile is not transported
Turn (halted state of such as automobile in traffic lights are waited), automotive air-conditioning system 100 can still realize refrigeration.In addition,
Step S2) in the open degree of increase electric expansion valve 1 be for the more liquid refrigerants of storage in the vaporizer 2, to extend
Evaporation time, so as to play the purpose for extending cooling time.In sum, control method of the present invention only needs to set up existing
On automotive air-conditioning system, control method is simple, it is not necessary to extra to increase spare part or material, significantly reduces cost.
It should be noted that：Above example is merely to illustrate the present invention and not limits technical side described in the invention
Case, although this specification with reference to the above embodiments pair present invention has been detailed description, the common skill of this area
Art personnel should be appreciated that person of ordinary skill in the field still can modify or equivalent to the present invention, and
All technical schemes and its improvement without departing from the spirit and scope of the present invention, all should cover in scope of the presently claimed invention
It is interior.
Claims (10)
1. a kind of control method of automotive air-conditioning system, it is characterised in that the control method comprises the steps：
S1) judge whether automobile will stop；
S2) when automobile will stop, conditioning control unit performs parking toll logic, adjusts the open degree of electric expansion valve；
S3) when parking of automobile, electromotor and compressor stop operating；After parking of automobile, automotive air-conditioning system is interior circulation,
The electric expansion valve has certain open degree and flows into vaporizer to control cold-producing medium, and the cold-producing medium is steamed by the vaporizer
Send out heat absorption to postpone the rise time of in-car leaving air temp.
2. the control method of automotive air-conditioning system as claimed in claim 1, it is characterised in that：Step S2) in, the air-conditioning control
When unit processed performs parking toll logic, increase the open degree of electric expansion valve, step S3) in electric expansion valve open degree it is little
In step S2) in electric expansion valve open degree.
3. the control method of automotive air-conditioning system as claimed in claim 2, it is characterised in that：The compressor is change discharge capacity pressure
Contracting machine, it is in step S2) in, the discharge capacity for improving compressor is compressed to cold-producing medium.
4. the control method of automotive air-conditioning system as claimed in claim 1, it is characterised in that：The conditioning control unit includes
One judge module, step S1) in, the judge module according to speed, acceleration and braking conditions come comprehensive descision automobile whether
Will stop.
5. the control method of the automotive air-conditioning system as described in claim 1,2,3 or 4, it is characterised in that：Step S2) and step
S3 also include the step of whether automobile will stop really determined whether between), if wherein speed within the predetermined time
Zero is not reached yet, then the conditioning control unit abandons parking toll logic, backs within normal control logic.
6. the control method of the automotive air-conditioning system as described in claim 1,2,3 or 4, it is characterised in that：Step S1) in, recognize
Include determining that brake has been operated for the judgement that automobile will stop；Step S3) also comprise the steps afterwards：
S4) after in-car leaving air temp is higher than certain setting value, compressor is restarted.
7. the control method of the automotive air-conditioning system as described in claim 1,2,3 or 4, it is characterised in that：Step S3) in, pressure
After contracting machine is shut down, the electric expansion valve is opened with the open degree of a certain percentage ratio of fixation until leaving air temp sets higher than certain
Value.
8. the control method of the automotive air-conditioning system as described in claim 1,2,3 or 4, it is characterised in that：Step S3) in, pressure
After contracting machine is shut down, first the electric expansion valve is opened with the open degree for fixing the first percentage ratio and maintain the regular hour, then
Again the electric expansion valve is opened with the open degree for fixing the second percentage ratio until leaving air temp is 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 characterised in that：Step S3) in, pressure
After contracting machine is shut down, the open degree and leaving air temp of the electric expansion valve be linear or non-linear relation, and adjusts in real time
The open degree of the whole electric expansion valve, until leaving air temp is higher than certain setting value.
10. a kind of automotive air-conditioning system, the conditioning control unit of the automotive air-conditioning system according in claim 1 to 9 arbitrarily
Control method described in one is controlled to the automotive air-conditioning system, and the conditioning control unit can control the automobile
The compressor of air conditioning system, electric expansion valve and vaporizer, the automotive air-conditioning system also includes and compressor, electronic expansion
The connected condenser of valve.
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| CN201210276586.5A CN103568776B (en) | 2012-08-06 | 2012-08-06 | Automobile air-conditioning system and control method thereof |
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| CN201210276586.5A CN103568776B (en) | 2012-08-06 | 2012-08-06 | Automobile air-conditioning system and control method thereof |
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| KR101628568B1 (en) * | 2014-12-10 | 2016-06-09 | 현대자동차주식회사 | Method for controlling air conditioning device for vehicle |
| 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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| JP2000211351A (en) * | 1999-01-27 | 2000-08-02 | Nissan Shatai Co Ltd | Air conditioning device |
| DE102005001901A1 (en) * | 2005-01-14 | 2006-07-27 | Webasto Ag | Stand air conditioning module for a motor vehicle |
| CN201405703Y (en) * | 2009-05-21 | 2010-02-17 | 苟兴建 | Air cooling device in vehicles |
| CN101722913A (en) * | 2010-01-22 | 2010-06-09 | 奇瑞汽车股份有限公司 | Control device and control method for inner-outer circulation of air conditioner of vehicle |
| CN202071658U (en) * | 2011-03-29 | 2011-12-14 | 比亚迪股份有限公司 | Air-conditioning system for carriage |
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Effective date of registration: 20210715 Address after: 312500 xialiquan village, Qixing street, Xinchang County, Shaoxing City, Zhejiang Province Patentee after: SANHUA HOLDING GROUP Co.,Ltd. Address before: No.289, No.12 street, Xiasha Economic Development Zone, Hangzhou City, Zhejiang Province, 310018 Patentee before: Hangzhou Sanhua Research Institute Co.,Ltd. |