CN103968621B - A kind of electric expansion valve and air conditioning system for vehicle - Google Patents

A kind of electric expansion valve and air conditioning system for vehicle Download PDF

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Publication number
CN103968621B
CN103968621B CN201310044536.9A CN201310044536A CN103968621B CN 103968621 B CN103968621 B CN 103968621B CN 201310044536 A CN201310044536 A CN 201310044536A CN 103968621 B CN103968621 B CN 103968621B
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China
Prior art keywords
current value
exciting current
stepper motor
operating condition
expansion valve
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CN103968621A (en
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姜骁骏
姜益兵
王晖
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Zhejiang Sanhua Automotive Components Co Ltd
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Zhejiang Sanhua Automotive Components Co Ltd
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Priority to CN201310044536.9A priority Critical patent/CN103968621B/en
Application filed by Zhejiang Sanhua Automotive Components Co Ltd filed Critical Zhejiang Sanhua Automotive Components Co Ltd
Priority to KR1020157023536A priority patent/KR102013713B1/en
Priority to JP2015555578A priority patent/JP6254615B2/en
Priority to KR1020177032443A priority patent/KR20170127059A/en
Priority to PCT/CN2014/071615 priority patent/WO2014117721A1/en
Priority to US14/764,820 priority patent/US20150362236A1/en
Priority to EP14745487.0A priority patent/EP2952835A4/en
Publication of CN103968621A publication Critical patent/CN103968621A/en
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Abstract

The present invention provides a kind of electric expansion valve and air conditioning system for vehicle, by the current operating condition for acquiring stepper motor, exciting current value corresponding with current operating condition is selected, the exciting current value of selection is applied to the coil of stepper motor, so that the rotor of stepping electronics be driven to rotate.Due to stepper motor operating condition difference when, required exciting current value is also different, for example, the exciting current value needed is larger when operating condition difference, and when operating condition is good, the exciting current value needed is smaller.The exciting current value that this control method of the present invention is applied to stepper motor is to carry out dynamic adjustment according to the operating condition of stepper motor, rather than stepper motor one changeless exciting current value is applied to as the prior art.Therefore, electric expansion valve provided by the invention, the exciting current value for being supplied to stepper motor is more suitable, rather than a changeless biggish exciting current value, so as to save electric energy, reduces power consumption.

Description

A kind of electric expansion valve and air conditioning system for vehicle
Technical field
The present invention relates to automotive air-conditioning system technical field, in particular to a kind of electric expansion valve and air conditioning system for vehicle.
Background technique
Expansion valve reaches the control to system overheat degree by the adjusting to refrigerant flow for the refrigeration system in controlling Production is used.
Electric expansion valve (EXV) is controlled based on electric signal, compares heating power expansion valve, electric expansion valve is as electric drive portion Part needs to consume electric energy, and therefore, it is desirable to lower the power consumption of itself as much as possible under the premise of meeting system condition use.
The working method of electric expansion valve in the prior art is described below.
Electric expansion valve in air-conditioning system includes electric control part and mechanical part, and wherein electric control part passes through drive module Driving pulse is generated, the rotation of mechanical part such as stepper motor is controlled.
In the prior art, to the drive control of the stepper motor of electric expansion valve, constant voltage mode or constant current are generally used Mode.
Constant voltage mode refers to using a fixed voltage and drives stepper motor, generates just on stepper motor coil Than in the current signal of the voltage.
Current constant mode, refer to using pulsewidth modulation (PWM, Pulse Width Modulation) technology to voltage signal into Row modulation.In the turn-on time of PWM, voltage is applied on the coil of stepper motor, and the electricity persistently increased is generated on coil Signal is flowed, when current signal reaches preset value, the turn-on time of PWM terminates.For current constant mode, there are also a kind of subdivision constant currents Mode, such as four, eight, 16 subdivisions, can produce micro-stepping.Compared to common current constant mode, segments current constant control and make electric current Waveform is more controllable.
But no matter in the prior art to the control of electric expansion valve using constant voltage mode or current constant mode, for quilt For the stepper motor of control, it is equivalent to the current impulse that certain rule is applied on the coil of stepper motor, i.e. excitation electricity Stream, to generate the torque for attracting the rotor rotation of stepper motor.
For current constant mode, due to driving stepper motor using a fixed voltage value, in the line of stepper motor The current value generated on circle is also fixed therewith, and the current value is directly proportional to fixed voltage value.
For current constant mode, subdivision mode is either used, does not still use subdivision mode, once preset current value is true Fixed, then the current waveform being applied on coil also determines therewith, i.e., the equivalent current values on coil are fixed.
Current value and equivalent current values are not repartitioned below, are collectively referred to as equivalent current values.
For torque angle, the torque for attracting the rotor of stepper motor to rotate depends mainly on the size of coil equivalent current The size of value, the structure of stepper motor and material of stepper motor etc..But when stepper motor after the assembly is completed, stepping electricity The structure of machine and the material of stepper motor have been fixed, therefore, torque size be only dependent upon be applied to it is equivalent on coil The size of current value.Provided that being fixed to the equivalent current values of stepper motor coil, then the minimum value of the equivalent current values Component depending on assembling the stepper motor in actual use requires the maximum of electric current, i.e., according to the maximum current of part requirement Equivalent current values are arranged.
When for being applied to the air-conditioning system such as air conditioning system for vehicle of complex working condition using the electric expansion valve of stepper motor, Air-conditioning system differs greatly to the torque requirement of electric expansion valve under different operating conditions, and when operating condition difference, required torque can be work The several times of condition required torque when good.The requirement of high-torque when therefore, in order to meet worst operating condition, need to be arranged one it is higher Equivalent current values.But when good for operating condition, so big electric current is not needed actually, electric energy otherwise can be wasted, function is increased Consumption.Moreover, under normal circumstances, the operating condition worst shared time is also very short, in this way, equivalent current is arranged according to worst operating condition Value, it is longer for production life cycle, then it wastes more serious.Moreover, working using higher equivalent current values always, product can be reduced Service life.
In conclusion the equivalent current values applied in the prior art to the stepper motor in electric expansion valve are to immobilize , a higher current value is all made of such current value and is operated during whole service, such stepper motor compares Electric energy is wasted, power consumption is increased.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of electric expansion valve and air conditioning system for vehicle, can save electricity Can, reduce power consumption.
The embodiment of the present invention provides a kind of electric expansion valve, comprising: valve body, the channel passed through for limiting refrigerant；Valve Needle, for changing the flow of refrigerant；Electric drive, the electric drive have stepper motor according to the stepper motor Rotation angle controls the opening degree of the coolant channel by the movement needle；
Further include: electronic expansion valve controller；
The electronic expansion valve controller, for according to the selection of the current operating condition of stepper motor and the current operation The corresponding exciting current value of operating condition；And the exciting current value is applied to the stepper motor in electric expansion valve mechanical part Coil, the coil obtain it is electric after driving machine tool part valve needle movements.
Preferably, the electronic expansion valve controller includes: LIN transceiver module, central processing module, stepper drive control Module and drive module；
The LIN transceiver module, for receiving the current fortune for the stepper motor that air-conditioner controller is sent from LIN bus Row operating condition, and the signal of the current operating condition is subjected to level conversion, being converted to the central processing module can receive Signal；
The central processing module, for according to the selection of the current operating condition of stepper motor and the current operating condition Corresponding exciting current value setting order, and exciting current value setting order is sent to the step motor control mould Block；
The step motor control module generates corresponding exciting current for setting order according to the exciting current value Value, and the drive module is sent to after the exciting current value is quantified；
The drive module, for the exciting current value after quantization to be applied to the coil of stepper motor.
Preferably, the central processing module, for according to the selection of the current operating condition of stepper motor with it is described current The corresponding exciting current value setting order of operating condition, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, select preset corresponding with position control Position control exciting current value；
The position control exciting current value is less than the initialization exciting current value.
Preferably, the central processing module, for according to the selection of the current operating condition of stepper motor with it is described current The corresponding exciting current value setting order of operating condition, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is small In default transition location, then preset first exciting current value is selected；If the step number position of current stepper motor is greater than Or be equal to default transition location, then select preset second exciting current value；
The first exciting current value is greater than the second exciting current value；
The first exciting current value and the second exciting current value are respectively less than the initialization exciting current value.
Preferably, the central processing module, for according to the selection of the current operating condition of stepper motor with it is described current The corresponding exciting current value setting order of operating condition, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is small In default transition location, then preset first exciting current value is selected；If the step number position of current stepper motor is greater than When judging that refrigerant pressure or pressure difference are less than preset pressure threshold value when being perhaps equal to default transition location, selection is preset The 5th exciting current value, when judging that refrigerant pressure or pressure difference are greater than or equal to preset pressure threshold value, selection is preset The 6th exciting current value；
The 5th exciting current value is less than the 6th exciting current value；
The 5th exciting current value and the 6th exciting current value are respectively less than the initialization exciting current value.
Preferably, the central processing module, for according to the selection of the current operating condition of stepper motor with it is described current The corresponding exciting current value setting order of operating condition, specifically:
Receive the signal of stepper motor stall；
Judge the current location of electric expansion valve whether in the threshold range of top position or bottom position；
If it is, judging that stepper motor is up the stall of generation；
If it is not, then maximum exciting current value is selected to be applied to the coil of stepper motor, electric expansion valve it is described most It is initialized under big exciting current value；It initializes and successfully then illustrates electric expansion valve there is no failure, if initialization Failure, then illustrate that electric expansion valve breaks down.
The present invention also provides a kind of air conditioning system for vehicle, comprising: valve body, the channel passed through for limiting refrigerant；Needle, For changing the flow of refrigerant；Electric drive, the electric drive have stepper motor according to the rotation of the stepper motor Gyration controls the opening degree of the coolant channel by the movement needle；
Further include: automotive air-conditioning controller；
The automotive air-conditioning controller, for acquiring the current operating condition of the stepper motor in electric expansion valve, according to The current operating condition selection exciting current value corresponding with the current operating condition of stepper motor；And it is the excitation is electric Flow valuve is applied to the coil of the stepper motor in electric expansion valve mechanical part, the coil obtain it is electric after driving machine tool part valve Needle movement.
Preferably, the automotive air-conditioning controller includes: air conditioning for automobiles center processor, stepper drive control module and drive Dynamic model block；
The air conditioning for automobiles center processor, for according to the selection of the current operating condition of stepper motor and the current fortune The corresponding exciting current value setting order of row operating condition, and exciting current value setting order is sent to the stepper motor Control module；
The step motor control module generates corresponding exciting current for setting order according to the exciting current value Value, and the drive module is sent to after the exciting current value is quantified；
The drive module, for the exciting current value after quantization to be applied to the coil of stepper motor.
Preferably, the air conditioning for automobiles center processor, for according to the selection of the current operating condition of stepper motor and institute The corresponding exciting current value setting order of current operating condition is stated, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, select preset corresponding with position control Position control exciting current value；
The position control exciting current value is less than the initialization exciting current value.
Preferably, the air conditioning for automobiles center processor, for according to the selection of the current operating condition of stepper motor and institute The corresponding exciting current value setting order of current operating condition is stated, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is small In default transition location, then preset first exciting current value is selected；If the step number position of current stepper motor is greater than Or be equal to default transition location, then select preset second exciting current value；
The first exciting current value is greater than the second exciting current value；
The first exciting current value and the second exciting current value are respectively less than the initialization exciting current value.
Preferably, the air conditioning for automobiles center processor, for according to the selection of the current operating condition of stepper motor and institute The corresponding exciting current value setting order of current operating condition is stated, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is small In default transition location, then preset first exciting current value is selected；If the step number position of current stepper motor is greater than When judging that refrigerant pressure or pressure difference are less than preset pressure threshold value when being perhaps equal to default transition location, selection is preset The 5th exciting current value, when judging that refrigerant pressure or pressure difference are greater than or equal to preset pressure threshold value, selection is preset The 6th exciting current value；
The 5th exciting current value is less than the 6th exciting current value；
The 5th exciting current value and the 6th exciting current value are respectively less than the initialization exciting current value.
Preferably, the air conditioning for automobiles center processor, for according to the selection of the current operating condition of stepper motor and institute The corresponding exciting current value setting order of current operating condition is stated, specifically:
Receive the signal of stepper motor stall；
Judge the current location of electric expansion valve whether in the threshold range of top position or bottom position；
If it is, judging that stepper motor is up the stall of generation；
If it is not, then maximum exciting current value is selected to be applied to the coil of stepper motor, electric expansion valve it is described most It is initialized under big exciting current value；It initializes and successfully then illustrates electric expansion valve there is no failure, if initialization Failure, then illustrate that electric expansion valve breaks down.
Compared with prior art, the invention has the following advantages that
Electric expansion valve and air conditioning system for vehicle provided in an embodiment of the present invention, by the current operation for acquiring stepper motor The exciting current value of selection is applied to stepper motor to select exciting current value corresponding with current operating condition by operating condition Coil, so that the rotor of stepping electronics be driven to rotate.Due to stepper motor operating condition difference when, required excitation electricity Flow valuve is also different, for example, the exciting current value needed is larger when operating condition difference, and when operating condition is good, the exciting current value that needs It is smaller.The exciting current value that this control method of the present invention is applied to stepper motor is carried out according to the operating condition of stepper motor Dynamic adjustment, rather than stepper motor one changeless exciting current value is applied to as the prior art.Therefore, originally Invent provide electric expansion valve, the exciting current value for being supplied to stepper motor is more suitable, rather than one it is changeless compared with Big exciting current value reduces power consumption so as to save electric energy.
Detailed description of the invention
Fig. 1 is the mechanical structure schematic diagram of electric expansion valve provided by the invention；
Fig. 2 is one flow chart of control method embodiment of electric expansion valve provided by the invention；
Fig. 3 is the working method of electric expansion valve provided by the invention and the correspondence diagram of exciting current value；
Fig. 4 is two flow chart of control method embodiment of electric expansion valve provided by the invention；
Fig. 5 is the position of electric expansion valve provided by the invention and the relation schematic diagram of friction rotor torque；
Fig. 6 is three flow chart of control method embodiment of electric expansion valve provided by the invention；
Fig. 7 is the corresponding relationship signal of the exciting current value on the position and coil of electric expansion valve provided by the invention Figure；
Fig. 8 is the correspondence diagram of the exciting current of refrigerant pressure differential and coil provided by the invention；
Fig. 9 is the control method example IV flow chart of electric expansion valve provided by the invention；
Figure 10 is five flow chart of control method embodiment of electric expansion valve provided by the invention；
Figure 11 is one structural schematic diagram of electronic expansion valve controls apparatus embodiments provided by the invention；
Figure 12 is two structural schematic diagram of control apparatus embodiments of electric expansion valve provided by the invention；
Figure 13 is three structural schematic diagram of control apparatus embodiments of electric expansion valve provided by the invention；
Figure 14 is four structural schematic diagram of control apparatus embodiments of electric expansion valve provided by the invention；
Figure 15 is five structural schematic diagram of control apparatus embodiments of electric expansion valve provided by the invention；
Figure 16 is one schematic diagram of electric expansion valve embodiment provided by the invention；
Figure 17 is the embodiment schematic diagram of the corresponding electronic expansion valve controller of Figure 16；
Figure 18 is the another embodiment schematic diagram of air conditioning system for vehicle provided by the invention；
Figure 19 is the structural schematic diagram of the corresponding automotive air-conditioning controller of Figure 18.
Specific embodiment
In order to make those skilled in the art can better understand that being introduced first below with technical solution of the present invention is implemented The mechanical structure of electric expansion valve.
Referring to Fig. 1, which is the structural schematic diagram of electric expansion valve provided by the invention.
The mechanical part of electric expansion valve includes: valve body 1, sleeve 2, coil 3, rotor 4.
Valve body 1 forms the A channel 11 on top, and the high-pressure refrigerant for carrying out condenser enters evaporator by A channel 11.
Throttle orifice 13 is provided among A channel 11, needle 42 of the elastic connection on rotor 4 protrudes into throttle orifice 13, axial Movement is to control the circulation area of throttle orifice 13, to adjust the refrigerant flow into evaporator.
1 upper end of valve body is fixed with sleeve 2, internal to be connected with valve A channel 11, refrigerant accommodation space is formed, by O Type circle 7 seals.
Limited position mechanism 21 is set on sleeve 2, limits the stroke of rotor 4.
1 upper end of valve body is further fixed on nut seat 14, and nut 15 is fixed on nut seat 14.
Screw rod 41 and nut 15 engagement being connected on rotor 4 are rotated and are axially moved, and above-mentioned needle 42 is by 43 elasticity of spring Ground is pressed on screw rod 41.
Coil 3 is installed outside sleeve 2 and rotor 4 collectively constitutes a stepper motor.
In order to be easy to illustrate the working principle of electric expansion valve provided by the invention, it is defined below in several electric expansion valves Noun.
Electric control part exports exciting current to coil 3, and driving rotor 4 rotates.When rotor 4 is in extreme lower position, definition It is set for 0 step of electric expansion valve.Needle 42 and throttle orifice 13 completely attach to, and close A channel 11, refrigerant can not circulate.
Electric expansion valve EXV is preset with valve opening umber of pulse, sets in 0 step as starting point, inputs certain amount to coil 3 Driving pulse (i.e. exciting current), after rotor 4 turns over certain angle, needle 42 is just detached from throttle orifice 13, and A channel 11 penetrates through, Refrigerant can enter downstream evaporator.Therefore when valve is within valve opening umber of pulse, A channel 11 still maintains closing, system Cryogen can not circulate.The position of the needle 42 of corresponding valve opening umber of pulse is defined as default transition location.
When the position of needle 42 is less than default transition location, rotor 4 is in addition to being engaged generation with nut 15 by screw rod 41 Moment of friction square, will also be by the moment of friction of needle 42 and throttle orifice 13；After the position EXV is greater than transition location, rotor 4 No longer by the moment of friction of needle 42 and throttle orifice 13.
In addition if also resulting in 4 friction square of rotor when A channel 11 and 2 inner cavity refrigerant pressure of casing increase Increase.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention Specific embodiment be described in detail.
Referring to fig. 2, which is one flow chart of control method embodiment of electric expansion valve provided by the invention.
The control method of electric expansion valve provided in this embodiment, comprising:
S201: the current operating condition of the stepper motor of electric expansion valve is acquired；
Since the operating condition of stepper motor is different, then exciting current required for coil is not also identical.Therefore, by adopting Collect the current operating condition of stepper motor, to determine the exciting current for being applied to coil is how many.
S202: according to the current operating condition of stepper motor selection exciting current corresponding with the current operating condition Value；
When pre-set difference operating condition, the exciting current of coil needs.The current operating condition of stepper motor is true After fixed, according to current operating condition, scheduled exciting current value is selected.
S203: the exciting current value is applied to the coil of stepper motor in electric expansion valve.
The control method of electric expansion valve provided in an embodiment of the present invention, by the current operation work for acquiring stepper motor The exciting current value of selection is applied to stepper motor to select exciting current value corresponding with current operating condition by condition Coil, so that the rotor of stepping electronics be driven to rotate.Due to stepper motor operating condition difference when, required exciting current Be worth it is also different, for example, the exciting current value needed is larger when operating condition difference, and when operating condition is good, the exciting current value that needs compared with It is small.The exciting current value that this control method of the present invention is applied to stepper motor is moved according to the operating condition of stepper motor State adjustment, rather than stepper motor one changeless exciting current value is applied to as the prior art.Therefore, this hair The control method of bright offer, the exciting current value for being supplied to stepper motor is more suitable, rather than one changeless biggish Exciting current value reduces power consumption so as to save electric energy.
It should be noted that the general working method of electric expansion valve and the exciting current value of coil have relationship, referring to figure 3, which is the working method of electric expansion valve provided by the invention and the correspondence diagram of exciting current value.
Electric expansion valve is initial phase there are two types of working method, one kind, and another kind is flow control stage (i.e. position The control stage).
It is specifically described by taking the operating condition in both stages as an example below.
Referring to fig. 4, which is two flow chart of control method embodiment of electric expansion valve provided by the invention.
The control method of electric expansion valve provided in this embodiment, comprising:
S401: the current operating condition of the stepper motor in acquisition electric expansion valve；
S402: judge whether current operating condition is initialization operating condition；If it is, executing S403；If not initial Chemical industry condition is then position control operating condition, executes S404；
S403: the preset initialization exciting current value corresponding with initialization of selection；
S404: the preset position control exciting current value corresponding with position control of selection；
It should be noted that initial phase, usually when air-conditioning system opens or closes, control electric expansion valve into Row one operation, to confirm whether electric expansion valve is normal；It is also assumed that being that electric expansion valve is likely to occur exception when progress One operation.
Initial phase, during executing operation, aperture is covered from 0% to 100% electric expansion valve (EXV). First running to aperture is 0%, and reruning to aperture is 100%, finally rests on a spy Positioning is set, such as 120 steps are set.In another example first running to aperture from current location is 100%, reruning to aperture is 0%, most After rest on a specific position, such as 120 steps are set.
During initialization operation, since needle can touch valve body, rotor rotation can be made to encounter bigger frictional force Square.
In position control operating process, refer in air-conditioning system operational process, EXV receives control command, passes through control Needle processed moves up and down control aperture, and then achievees the purpose that control flow.
When flow control, EXV is generally not in the case where aperture is 0, and general minimum step number position is greater than default Transition location.
For example, valve port minimum aperture is 20%, corresponding EXV step number position is 60 steps.It is understood that for difference EXV, may identical aperture, corresponding step number position is not identical, this depends on specific structure.
In conclusion the position control exciting current value is less than the initialization exciting current value.Because initializing Cheng Zhong, during executing operation, aperture is covered from 0% to 100% electric expansion valve (EXV).For example, initialization excitation Current value is 300mA, and position control exciting current value is 150mA.
Referring to Fig. 5, which is the position of electric expansion valve provided by the invention and the relation schematic diagram of friction rotor torque.
For example, default transition location is 30 steps, when the step number position of the stepper motor of EXV is less than default transition location, Corresponding friction rotor torque has a corresponding relationship, as shown in Figure 5.When the step number position of stepper motor is greater than default turnover position When setting, with the increase of step number position, rotor friction square is held essentially constant.
Therefore, it is based on principle shown in fig. 5, the present invention also provides a kind of embodiments.
Referring to Fig. 6, which is three flow chart of control method embodiment of electric expansion valve provided by the invention.
S601: the current operating condition of the stepper motor in acquisition electric expansion valve；
S602: judge whether current operating condition is initialization operating condition；If it is, executing S603；If not initial Chemical industry condition is then position control operating condition, executes S604；
S603: the preset initialization exciting current value corresponding with initialization of selection；
S604: judging whether the step number position of current stepper motor is less than default transition location, if it is, executing S605；Conversely, executing S606；
S605: the preset first exciting current value of selection；
S606: the preset second exciting current value of selection；
The first exciting current value is greater than the second exciting current value；
The first exciting current value and the second exciting current value are respectively less than the initialization exciting current value.
In order to so more preferable that understand the corresponding embodiment of Fig. 6,7 it is described in detail with reference to the accompanying drawing.
Referring to Fig. 7, which is that the position of electric expansion valve provided by the invention is corresponding with the exciting current value on coil Relation schematic diagram.
It is right in Fig. 7 when the position of electric expansion valve EXV (i.e. the step number position of stepper motor) is less than default transition location The exciting current value for the coil answered is the first exciting current value；When the step number position of stepper motor is greater than default transition location, Corresponding exciting current value is the second exciting current value.
Obviously, the first exciting current value is greater than the second exciting current value.
This is because EXV rotor friction square is big when the position EXV is less than default transition location, turn to overcome Moment of friction suffered by son needs stepper motor to provide bigger rotating torque to rotor, that is, needs to the stator of stepper motor Coil provides bigger exciting current value.At this point, the exciting current value is the first exciting current value.
When the position EXV is greater than default transition location, EXV rotor friction square becomes smaller, and is correspondingly provided to The exciting current of the stator coil of stepper motor reduces, at this point, the exciting current value is the second exciting current value.
For example, the first exciting current value is 200mA, the second exciting current value is 100mA.It is right for common current constant mode It should be 1,000 0000 in the digital quantity that the first exciting current value, central processing module input to D/A converter module；Corresponding second Exciting current value, the digital quantity that central processing module inputs to D/A converter module is 100 0000.
For segmenting current constant mode, correspond to the first exciting current value, if central processing module is by 10 using 4 subdivisions 0000, it 100 0000,1100000,1,000 0000 sequentially inputs to D/A converter module；Corresponding second exciting current value, center Processing module is sequentially input 1 0000,10 0000,11 0000,100 0000 to D/A converter module.It is corresponding in turn to The current value of 1/4 micro-stepping position, 1/2 micro-stepping position, 3/4 micro-stepping position, synchronizing position.
It should be noted that central processing module and D/A converter module are the modules in electronic expansion valve controller.
The embodiment of the invention also provides the control method of another electric expansion valve, due to reality to electric expansion valve into When row position control, it is also necessary to consider the influence of refrigerant pressure or pressure difference to friction rotor torque.
Referring to Fig. 8, which is the correspondence diagram of the exciting current of refrigerant pressure differential and coil provided by the invention.
When refrigerant pressure or pressure difference are less than preset pressure threshold value Pth, using the 5th exciting current value；When pressure or When pressure difference is greater than preset pressure threshold value Pth, using the 6th exciting current value.
It should be noted that the refrigerant pressure or pressure difference preset pressure threshold value in the present embodiment only set one, It is understood that the preset pressure threshold value is not limited to one, multiple preset pressure threshold values can be set, are correspondingly corresponding with more A exciting current value.
In order to better understand the present invention, corresponding relationship of the explanation based on Fig. 8 another implementation provided by the invention below Example.
Referring to Fig. 9, which is the control method example IV flow chart of electric expansion valve provided by the invention.
S901: the current operating condition of the stepper motor in acquisition electric expansion valve；
S902: judge whether current operating condition is initialization operating condition；If it is, executing S903；If not initial Chemical industry condition is then position control operating condition, executes S904；
S903: the preset initialization exciting current value corresponding with initialization of selection；
S904: judging whether the step number position of current stepper motor is less than default transition location, if it is, executing S905；Conversely, executing S906；
S905: the preset first exciting current value of selection；
S906: judging whether refrigerant pressure or pressure difference are less than preset pressure threshold value, if it is, executing S907；Instead Execution S908；
S907: the preset 5th exciting current value of selection,
S908: the preset 6th exciting current value of selection.
The 5th exciting current value is less than the 6th exciting current value；
The 5th exciting current value and the 6th exciting current value are respectively less than the initialization exciting current value.
In stepper motor operational process, it may appear that stall caused by insubstantial failure, at this time if give coil one compared with Big exciting current value, then the unsubstantiality failure can be excluded.
Therefore, invention further provides a kind of control methods of electric expansion valve.
Referring to Figure 10, which is five flow chart of control method embodiment of electric expansion valve provided by the invention.
S1001: the signal of stepper motor stall is received；
It should be noted that the stepper drive control module in air-conditioner controller can detecte stall signal, then will Stall signal is sent to central processing module.
S1002: judge the current location of electric expansion valve whether in the threshold range of top position or bottom position；
If the current location of electric expansion valve is in the threshold range of top position, or in the threshold of bottom position It is worth in range, then explanation is the stall generated that runs well, and is not the stall that failure generates.It biggish is encouraged to coil one at this time Magnetoelectricity flow valuve, then can continue to run well.
S1003: if it is, judging that stepper motor is up the stall of generation；
S1004: if it is not, then maximum exciting current value is selected to be applied to the coil of stepper motor, electric expansion valve exists It is initialized under the maximum exciting current value；It initializes and successfully then illustrates electric expansion valve there is no failures, if Initialization failure, then illustrate that electric expansion valve breaks down.
Control method provided in this embodiment can apply one to coil and maximum encourage when detecting stall signal Magnetoelectricity flow valuve judges whether to be the stall occurred due to substantive failure in this way, so as to exclude to block up caused by insubstantial failure Turn, the service life of electric expansion valve can be postponed in this way.
It should be noted that maximum exciting current value herein is the maximum current that electric expansion valve can be provided.
It should be noted that the control method provided in embodiment illustrated in fig. 10, it can be with above-mentioned other methods embodiment Want to combine, since stall signal may be the signal occurred at any time in motor operation course, with other methods embodiment In step be not present sequencing.
The control method of the electric expansion valve provided based on the above embodiment, the present invention also provides the controls of electric expansion valve Its component part is described in detail combined with specific embodiments below in control equipment.
Referring to Figure 11, which is one structural schematic diagram of electronic expansion valve controls apparatus embodiments provided by the invention.
The control equipment of electric expansion valve provided in this embodiment, comprising: acquisition unit 1101, selecting unit 1102 and apply Add unit 1103；
The acquisition unit 1101, the current operating condition of the stepper motor for acquiring resistance expansion valve；
Since the operating condition of stepper motor is different, then exciting current required for coil is not also identical.Therefore, by adopting Collect the current operating condition of stepper motor, to determine the exciting current for being applied to coil is how many.
The selecting unit 1102, for according to the selection of the current operating condition of stepper motor and the current operating condition Corresponding exciting current value；
When pre-set difference operating condition, the exciting current of coil needs.The current operating condition of stepper motor is true After fixed, according to current operating condition, scheduled exciting current value is selected.
The applying unit 1103, for the exciting current value to be applied to the line of stepper motor in electric expansion valve Circle.
The control equipment of electric expansion valve provided in an embodiment of the present invention, by the current operation work for acquiring stepper motor The exciting current value of selection is applied to stepper motor to select exciting current value corresponding with current operating condition by condition Coil, so that the rotor of stepping electronics be driven to rotate.Due to stepper motor operating condition difference when, required exciting current Be worth it is also different, for example, the exciting current value needed is larger when operating condition difference, and when operating condition is good, the exciting current value that needs compared with It is small.This control equipment of the present invention, which is applied to the exciting current value of stepper motor, to be moved according to the operating condition of stepper motor State adjustment, rather than stepper motor one changeless exciting current value is applied to as the prior art.Therefore, this hair The control equipment of bright offer, the exciting current value for being supplied to stepper motor is more suitable, rather than one changeless biggish Exciting current value reduces power consumption so as to save electric energy.
Electric expansion valve is initial phase there are two types of working method, one kind, and another kind is flow control stage (i.e. position The control stage).
It is specifically described by taking the operating condition in both stages as an example below.
Referring to Figure 12, which is two structural schematic diagram of control apparatus embodiments of electric expansion valve provided by the invention.
In conclusion the position control exciting current value is less than the initialization exciting current value.Because initializing Cheng Zhong, during executing operation, aperture is covered from 0% to 100% electric expansion valve (EXV).For example, initialization excitation Current value is 300mA, and position control exciting current value is 150mA.
Selecting unit 1102 provided in this embodiment includes: initialization exciting current value selection subelement 1102a and position It controls exciting current value and selects subelement 1102b；
The initialization exciting current value selects subelement 1102a, for the current operating condition when acquisition stepper motor When to initialize, preset initialization exciting current value corresponding with initialization is selected；
The position control exciting current value selects subelement 1102b, for the current operation work when acquisition stepper motor When condition is position control, preset position control exciting current value corresponding with position control is selected；
The position control exciting current value is less than the initialization exciting current value.
Embodiment corresponding to Figure 12 is that the operating condition of electric expansion valve is divided into two letters of initialization and position control Single stage.In the another apparatus embodiments being provided below, the current step number to stepper motor joined in the position control stage The judgement of position, such control are more accurate.Under normal circumstances, step number position is transported in the region for being greater than default transition location Row.
Referring to Figure 13, which is three structural schematic diagram of control apparatus embodiments of electric expansion valve provided by the invention.
Selecting unit provided in this embodiment includes: initialization exciting current value selection subelement 1102a, the first judgement Unit 1102c, the first exciting current value selection subelement 1102d and the second exciting current value select subelement 1102e；
The initialization exciting current value selects subelement 1102a, for the current operating condition when acquisition stepper motor When to initialize, preset initialization exciting current value corresponding with initialization is selected；
The first judgment sub-unit 1102c is used for when the current operating condition for acquiring stepper motor is position control Judge whether the step number position of current stepper motor is less than default transition location；
The first exciting current value selects subelement 1102d, for working as when the first judgment sub-unit 1102c judgement When the step number position of preceding stepper motor is less than default transition location, preset first exciting current value is selected；
The second exciting current value selects subelement 1102e, for working as when the first judgment sub-unit 1102c judgement When the step number of preceding stepper motor is more than or equal to default transition location, preset second exciting current value is selected；
The first exciting current value is greater than the second exciting current value；
The first exciting current value and the second exciting current value are respectively less than the initialization exciting current value.
It is more accurate for control, in another embodiment below, it joined in the position control stage to refrigerant pressure The considerations of factor.
Referring to Figure 14, which is four structural schematic diagram of control apparatus embodiments of electric expansion valve provided by the invention.
The selecting unit 1102 provided in this embodiment includes: initialization exciting current value selection subelement 1102a, the One judgment sub-unit 1102c, the first exciting current value select subelement 1102d, the second judgment sub-unit 1102f, the 5th excitation Current value selects subelement 1102g and the 6th exciting current value to select subelement 1102h；
The initialization exciting current value selects subelement 1102a, for the current operating condition when acquisition stepper motor When to initialize, preset initialization exciting current value corresponding with initialization is selected；
The first judgment sub-unit 1102c is used for when the current operating condition for acquiring stepper motor is position control Judge whether the step number position of current stepper motor is less than default transition location；
The first exciting current value selects subelement 1102d, when first judgment sub-unit judges current stepping electricity When the step number position of machine is less than default transition location, for selecting preset first exciting current value；
The second judgment sub-unit 1102f, when first judgment sub-unit judges the step number position of current stepper motor When setting more than or equal to default transition location, for judging whether refrigerant pressure or pressure difference are less than preset pressure threshold value；
The 5th exciting current value selects subelement 1102g, for when the second judgment sub-unit 1102f judgement system When refrigerant pressure or pressure difference are less than preset pressure threshold value, preset 5th exciting current value is selected；
The 6th exciting current value selects subelement 1102h, for when the second judgment sub-unit 1102f judgement system When refrigerant pressure or pressure difference are greater than or equal to preset pressure threshold value, preset 6th exciting current value is selected；
The 5th exciting current value is less than the 6th exciting current value；
The 5th exciting current value and the 6th exciting current value are respectively less than the initialization exciting current value.
In stepper motor operational process, it may appear that stall caused by insubstantial failure, at this time if give coil one compared with Big exciting current value, then the unsubstantiality failure can be excluded.
Therefore, invention further provides a kind of control equipment of electric expansion valve.
Referring to Figure 15, which is five structural schematic diagram of control apparatus embodiments of electric expansion valve provided by the invention.
The selecting unit provided in this embodiment further include: receiving subelement 1102j, third judgment sub-unit 1102k, It operates normally judgment sub-unit 1102l and maximum exciting current value selects subelement 1102m；
The receiving subelement 1102j, for receiving the signal of stepper motor stall；
The third judgment sub-unit 1102k, for judge electric expansion valve current location whether in top position or In the threshold range of person's bottom position；
The normal operation judgment sub-unit 1102l, when the third judgment sub-unit judges the current of electric expansion valve When position is in the threshold range of top position or bottom position, for judging stepper motor, there is no failures, belong to just The often stall that operation generates；
If the current location of electric expansion valve is in the threshold range of top position, or in the threshold of bottom position It is worth in range, then explanation is the stall generated that runs well, and is not the stall that failure generates.It biggish is encouraged to coil one at this time Magnetoelectricity flow valuve, then can continue to run well.
The maximum exciting current value selects subelement 1102m, for judging that electronics is swollen when the third judgment sub-unit When the current location of swollen valve is not in the threshold range of top position or bottom position, maximum exciting current value is selected to be applied to The coil of stepper motor, electric expansion valve are initialized under the maximum exciting current value；It initializes and successfully then illustrates There is no failures for electric expansion valve, if initialization failure, illustrates that electric expansion valve breaks down.
Control equipment provided in this embodiment can apply one to coil and biggish encourage when detecting stall signal Magnetoelectricity flow valuve judges whether to be the stall occurred due to substantive failure in this way, so as to exclude to block up caused by insubstantial failure Turn, the service life of electric expansion valve can be postponed in this way.
Based on the above control method and control equipment, the present invention also provides a kind of electric expansion valves, below with reference to specific Embodiment is discussed in detail its working principle.
Referring to Figure 16, which is one schematic diagram of electric expansion valve embodiment provided by the invention.
Electric expansion valve provided in this embodiment, comprising: valve body 1, the channel passed through for limiting refrigerant；Needle 42, For changing the flow of refrigerant；Electric drive, the electric drive have stepper motor 1601 according to the stepper motor Rotation angle the opening degree of the coolant channel is controlled by the movement needle 42；
Further include: electronic expansion valve controller 1602；
The electronic expansion valve controller 1602, for according to the selection of the current operating condition of stepper motor with it is described current The corresponding exciting current value of operating condition；And the exciting current value is applied to the stepping in electric expansion valve mechanical part The coil of motor, the coil obtain it is electric after driving machine tool part valve needle movements.
It should be noted that the stepper motor 1601 includes rotor.
Valve body 1, needle 42 and rotor may refer to the structure chart of electric expansion valve shown in FIG. 1.
Electric expansion valve provided in an embodiment of the present invention, electronic expansion valve controller 1602 is according to the current fortune of stepper motor The exciting current value of selection is applied to stepping electricity to select exciting current value corresponding with current operating condition by row operating condition The coil of machine, so that the rotor of stepping electronics be driven to rotate.Due to stepper motor operating condition difference when, required excitation Current value is also different, for example, the exciting current value needed is larger when operating condition difference, and when operating condition is good, the exciting current that needs It is worth smaller.The exciting current value that the present invention is applied to stepper motor is to carry out dynamic adjustment according to the operating condition of stepper motor , rather than stepper motor one changeless exciting current value is applied to as the prior art.Therefore, the present invention provides It is more suitable to the exciting current value of stepper motor, rather than a changeless biggish exciting current value, so as to save Electric energy is saved, power consumption is reduced.
Referring to Figure 17, which is the embodiment schematic diagram of the corresponding electronic expansion valve controller of Figure 16.
Electronic expansion valve controller provided in this embodiment include: LIN transceiver module 1701, central processing module 1702, Stepper drive control module 1703 and drive module 1704；
The LIN transceiver module 1701, for receiving working as the stepper motor that sends of air-conditioner controller from LIN bus Preceding operating condition, and the signal of the current operating condition is subjected to level conversion, being converted to the central processing module can be with Received signal；
Electronic expansion valve controller and air-conditioner controller in the present embodiment are two independent devices, so needing from sky Controller is adjusted to receive the operating condition of current stepper motor.E.g. received by LIN bus.
The central processing module 1702, for according to the selection of the current operating condition of stepper motor and the current operation The corresponding exciting current value setting order of operating condition, and exciting current value setting order is sent to the stepper motor control Molding block 1703；
The step motor control module 1703 generates corresponding excitation for setting order according to the exciting current value Current value, and the drive module is sent to after the exciting current value is quantified；
The drive module 1704, for the exciting current value after quantization to be applied to the coil of stepper motor.
It should be noted that in the present invention, the central processing module, for the current operating condition according to stepper motor Selection exciting current value setting order corresponding with the current operating condition, can correspond to three embodiments, separately below These three embodiments are introduced.
It should be noted that the general working method of electric expansion valve and the exciting current value of coil have relationship, referring to figure 3, which is the working method of electric expansion valve provided by the invention and the correspondence diagram of exciting current value.
Electric expansion valve is initial phase there are two types of working method, one kind, and another kind is flow control stage (i.e. position The control stage).
It is specifically described by taking the operating condition in both stages as an example below.
The central processing module, for according to the selection of the current operating condition of stepper motor and the current operating condition Corresponding exciting current value setting order, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, select preset corresponding with position control Position control exciting current value；
The position control exciting current value is less than the initialization exciting current value.
When the step number position of stepper motor is greater than default transition location, with the increase of step number position, rub suffered by rotor Torque is wiped to be held essentially constant.
Therefore, it is based on principle shown in fig. 5, the present invention also provides a kind of embodiments.
The central processing module, for according to the selection of the current operating condition of stepper motor and the current operating condition Corresponding exciting current value setting order, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is small In default transition location, then preset first exciting current value is selected；If the step number position of current stepper motor is greater than Or be equal to default transition location, then select preset second exciting current value；
The first exciting current value is greater than the second exciting current value；
The first exciting current value and the second exciting current value are respectively less than the initialization exciting current value.
The embodiment of the invention also provides another electric expansion valves, since reality carries out position control to electric expansion valve When, it is also necessary to consider the influence of refrigerant pressure or pressure difference to friction rotor torque.
The central processing module, for according to the selection of the current operating condition of stepper motor and the current operating condition Corresponding exciting current value setting order, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is small In default transition location, then preset first exciting current value is selected；If the step number position of current stepper motor is greater than When judging that refrigerant pressure or pressure difference are less than preset pressure threshold value when being perhaps equal to default transition location, selection is preset The 5th exciting current value, when judging that refrigerant pressure or pressure difference are greater than or equal to preset pressure threshold value, selection is preset The 6th exciting current value；
The 5th exciting current value is less than the 6th exciting current value；
The 5th exciting current value and the 6th exciting current value are respectively less than the initialization exciting current value.
In stepper motor operational process, it may appear that stall caused by insubstantial failure, at this time if give coil one compared with Big exciting current value, then the unsubstantiality failure can be excluded.
Therefore, invention further provides a kind of electric expansion valves.
The central processing module, for according to the selection of the current operating condition of stepper motor and the current operating condition Corresponding exciting current value setting order, specifically:
Receive the signal of stepper motor stall；
Judge the current location of electric expansion valve whether in the threshold range of top position or bottom position；
If it is, judging that stepper motor is up the stall of generation；
If it is not, then maximum exciting current value is selected to be applied to the coil of stepper motor, electric expansion valve it is described most It is initialized under big exciting current value；It initializes and successfully then illustrates electric expansion valve there is no failure, if initialization Failure, then illustrate that electric expansion valve breaks down.
Electric expansion valve provided in this embodiment, can be maximum to coil application one when detecting stall signal Exciting current value judges whether it is the stall occurred due to substantive failure, in this way so as to exclude caused by insubstantial failure Stall can postpone the service life of electric expansion valve in this way.
It should be noted that maximum exciting current value herein is the maximum current that electric expansion valve can be provided.
It should be noted that the central processing module provided in the present embodiment, can think with above-mentioned other methods embodiment In conjunction with since stall signal may be in the signal occurred at any time in motor operation course, with other methods embodiment The step of be not present sequencing.
It is understood that the electric expansion valve that above embodiments provide, electronic expansion valve controller and automobile therein Air-conditioner controller is two individual devices, is there are also a kind of situation, and the function that electronic expansion valve controller is realized is by automobile sky Controller is adjusted to realize, i.e., automotive air-conditioning controller is integrated with the function of electronic expansion valve controller.Therefore, the present invention also provides A kind of air conditioning system for vehicle.
Referring to Figure 18, which is air conditioning system for vehicle schematic diagram provided by the invention.
Air conditioning system for vehicle provided in this embodiment, comprising: valve body, the channel passed through for limiting refrigerant；Needle is used In the flow for changing refrigerant；Electric drive, the electric drive have stepper motor according to the rotation of the stepper motor Angle controls the opening degree of the coolant channel by the movement needle；
Further include: automotive air-conditioning controller；
The automotive air-conditioning controller, for acquiring the current operating condition of the stepper motor in electric expansion valve, according to The current operating condition selection exciting current value corresponding with the current operating condition of stepper motor；And it is the excitation is electric Flow valuve is applied to the coil of the stepper motor in electric expansion valve mechanical part, the coil obtain it is electric after driving machine tool part valve Needle movement.
Air conditioning system for vehicle provided in an embodiment of the present invention, automotive air-conditioning controller 1801 is according to the current fortune of stepper motor The exciting current value of selection is applied to stepping electricity to select exciting current value corresponding with current operating condition by row operating condition The coil of machine, so that the rotor of stepping electronics be driven to rotate.Due to stepper motor operating condition difference when, required excitation Current value is also different, for example, the exciting current value needed is larger when operating condition difference, and when operating condition is good, the exciting current that needs It is worth smaller.The exciting current value that the present invention is applied to stepper motor is to carry out dynamic adjustment according to the operating condition of stepper motor , rather than stepper motor one changeless exciting current value is applied to as the prior art.Therefore, the present invention provides It is more suitable to the exciting current value of stepper motor, rather than a changeless biggish exciting current value, so as to save Electric energy is saved, power consumption is reduced.
Referring to Figure 19, which is the structural schematic diagram of the corresponding automotive air-conditioning controller of Figure 18.
Automotive air-conditioning controller provided in this embodiment includes: air conditioning for automobiles center processor 1901, stepper drive control Module 1902 and drive module 1903；
The air conditioning for automobiles center processor 1901, for selecting to work as with described according to the current operating condition of stepper motor The corresponding exciting current value setting order of preceding operating condition, and exciting current value setting order is sent to the stepping Motor control module 1902；
The step motor control module 1902 generates corresponding excitation for setting order according to the exciting current value Current value, and the drive module is sent to after the exciting current value is quantified；
The drive module 1903, for the exciting current value after quantization to be applied to the coil of stepper motor.
It should be noted that in the present invention, the air conditioning for automobiles center processor, for the current fortune according to stepper motor Row operating condition selection exciting current value setting order corresponding with the current operating condition, can correspond to three embodiments, under Face is respectively introduced these three embodiments.
It should be noted that the general working method of electric expansion valve and the exciting current value of coil have relationship, referring to figure 3, which is the working method of electric expansion valve provided by the invention and the correspondence diagram of exciting current value.
Electric expansion valve is initial phase there are two types of working method, one kind, and another kind is flow control stage (i.e. position The control stage).
It is specifically described by taking the operating condition in both stages as an example below.
The air conditioning for automobiles center processor, for according to the selection of the current operating condition of stepper motor and the current fortune The corresponding exciting current value setting order of row operating condition, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, select preset corresponding with position control Position control exciting current value；
The position control exciting current value is less than the initialization exciting current value.
When the step number position of stepper motor is greater than default transition location, with the increase of step number position, rub suffered by rotor Torque is wiped to be held essentially constant.
Therefore, it is based on principle shown in fig. 5, the present invention also provides a kind of air conditioning system for vehicle embodiments.
The air conditioning for automobiles center processor, for according to the selection of the current operating condition of stepper motor and the current fortune The corresponding exciting current value setting order of row operating condition, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is small In default transition location, then preset first exciting current value is selected；If the step number position of current stepper motor is greater than Or be equal to default transition location, then select preset second exciting current value；
The first exciting current value is greater than the second exciting current value；
The first exciting current value and the second exciting current value are respectively less than the initialization exciting current value.
The embodiment of the invention also provides another air conditioning system for vehicle, since reality carries out position control to electric expansion valve When processed, it is also necessary to consider the influence of refrigerant pressure or pressure difference to friction rotor torque.
The air conditioning for automobiles center processor, for according to the selection of the current operating condition of stepper motor and the current fortune The corresponding exciting current value setting order of row operating condition, specifically:
When the current operating condition for acquiring stepper motor is initialization, select preset corresponding with initialization first Beginningization exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is small In default transition location, then preset first exciting current value is selected；If the step number position of current stepper motor is greater than When judging that refrigerant pressure or pressure difference are less than preset pressure threshold value when being perhaps equal to default transition location, selection is preset The 5th exciting current value, when judging that refrigerant pressure or pressure difference are greater than or equal to preset pressure threshold value, selection is preset The 6th exciting current value；
The 5th exciting current value is less than the 6th exciting current value；
The 5th exciting current value and the 6th exciting current value are respectively less than the initialization exciting current value.
It is understood that in stepper motor operational process, it may appear that stall caused by insubstantial failure, at this time if given Coil one biggish exciting current value is given, then the unsubstantiality failure can be excluded.
Therefore, invention further provides a kind of air conditioning system for vehicle.
The air conditioning for automobiles center processor, for according to the selection of the current operating condition of stepper motor and the current fortune The corresponding exciting current value setting order of row operating condition, specifically:
Receive the signal of stepper motor stall；
Judge the current location of electric expansion valve whether in the threshold range of top position or bottom position；
If it is, judging that stepper motor is up the stall of generation；
If it is not, then maximum exciting current value is selected to be applied to the coil of stepper motor, electric expansion valve it is described most It is initialized under big exciting current value；It initializes and successfully then illustrates electric expansion valve there is no failure, if initialization Failure, then illustrate that electric expansion valve breaks down.
Air conditioning system for vehicle provided in this embodiment can apply a maximum to coil when detecting stall signal Exciting current value, judge whether in this way be due to substantive failure occur stall, cause so as to exclude insubstantial failure Stall, the service life of electric expansion valve can be postponed in this way.
It should be noted that maximum exciting current value herein is the maximum current that electric expansion valve can be provided.
It should be noted that the air conditioning for automobiles master controller provided in the present embodiment, it can be real with above-mentioned other methods It applies example to want to combine, since stall signal may be the signal occurred at any time in motor operation course, with other methods reality Sequencing is not present in the step applied in example.
It should be noted that automotive air-conditioning controller other than controlling electric expansion valve, further includes other and implementation automobile The related various modules of airconditioning control, only symbolically illustrate part related to the present invention herein.It includes input processor, For receiving the various switch control signals inputted from Air-Conditioning Control Panel, it is also used to receive and is arranged in air-conditioning system pipeline The signal that various sensors detect, such as each temperature sensor refrigerant or air temperature value that detect, for another example each pressure The pressure value for the refrigerant that force snesor detects, pressure sensor can be arranged in the discharge port of compressor, and (i.e. electronics is swollen The upstream of swollen valve EXV), it can also be arranged in EXV entrance, to detect high-pressure side refrigerant pressure；The pressure sensor can also be with The downstream EXV is arranged in detect low-side refrigerant pressure.Comprising air conditioning for automobiles master controller, input processor is by input Control signal and sensor signal are handled, and the controller is output to, and one side output signal controls air conditioning for automobiles control The driver of device ECU drives other modules (such as air door module, blower fan module) to control air door (such as mode in air-conditioning system Air door), blower etc.；On the other hand according to the program and data stored in the input signal and memory itself, stepping is controlled Drive control module.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.

Claims (10)

1. a kind of electric expansion valve, comprising: valve body, the channel passed through for limiting refrigerant；Needle, for changing refrigerant Flow；Electric drive, the electric drive have stepper motor to pass through mobile institute according to the rotation angle of the stepper motor Needle is stated to control the opening degree of the coolant channel；
It is characterized by further comprising: electronic expansion valve controller；
The electronic expansion valve controller, for according to the selection of the current operating condition of stepper motor and the current operating condition Corresponding exciting current value；And the exciting current value is applied to the line of the stepper motor in electric expansion valve mechanical part Circle, the coil obtain it is electric after driving machine tool part valve needle movements；
The current operating condition includes initialization and position control, when the current operating condition of acquisition stepper motor is initialization When, select preset initialization exciting current value corresponding with initialization；When the current operating condition of acquisition stepper motor When for position control, preset position control exciting current value corresponding with position control is selected；The position control is encouraged Magnetoelectricity flow valuve is less than the initialization exciting current value；Initialize corresponding electronic expansion valve opening cover from 0% to 100%.
2. electric expansion valve according to claim 1, which is characterized in that the electronic expansion valve controller includes: that LIN is received Send out module, central processing module, stepper drive control module and drive module；
The LIN transceiver module, for receiving the current operation work for the stepper motor that air-conditioner controller is sent from LIN bus Condition, and the signal of the current operating condition is subjected to level conversion, be converted to the letter that the central processing module can receive Number；
The central processing module, it is opposite with the current operating condition for being selected according to the current operating condition of stepper motor The exciting current value setting order answered, and exciting current value setting order is sent to the stepper drive control module；
The stepper drive control module generates corresponding exciting current value for setting order according to the exciting current value, And the drive module is sent to after being quantified the exciting current value；
The drive module, for the exciting current value after quantization to be applied to the coil of stepper motor.
3. electric expansion valve according to claim 2, which is characterized in that the central processing module, for according to stepping The current operating condition selection of motor exciting current value setting order corresponding with the current operating condition, specifically:
When the current operating condition for acquiring stepper motor is initialization, preset initialization corresponding with initialization is selected Exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is less than in advance If transition location, then preset first exciting current value is selected；If the step number position of current stepper motor be greater than or Equal to default transition location, then preset second exciting current value is selected；
The first exciting current value is greater than the second exciting current value；
The first exciting current value and the second exciting current value are respectively less than the initialization exciting current value.
4. electric expansion valve according to claim 2, which is characterized in that the central processing module, for according to stepping The current operating condition selection of motor exciting current value setting order corresponding with the current operating condition, specifically:
When the current operating condition for acquiring stepper motor is initialization, preset initialization corresponding with initialization is selected Exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is less than in advance If transition location, then preset first exciting current value is selected；If the step number position of current stepper motor be greater than or When equal to default transition location, when judging that refrigerant pressure or pressure difference are less than preset pressure threshold value, preset the is selected Five exciting current values when judging that refrigerant pressure or pressure difference are greater than or equal to preset pressure threshold value, select preset the Six exciting current values；
The 5th exciting current value is less than the 6th exciting current value；
The 5th exciting current value and the 6th exciting current value are respectively less than the initialization exciting current value.
5. electric expansion valve according to claim 2, which is characterized in that the central processing module, for according to stepping The current operating condition selection of motor exciting current value setting order corresponding with the current operating condition, specifically:
Receive the signal of stepper motor stall；
Judge the current location of electric expansion valve whether in the threshold range of top position or bottom position；
If it is, judging that stepper motor is up the stall of generation；
If it is not, then maximum exciting current value is selected to be applied to the coil of stepper motor, electric expansion valve is described maximum It is initialized under exciting current value；It initializes and successfully then illustrates electric expansion valve there is no failure, if initialization failure, Then illustrate that electric expansion valve breaks down.
6. a kind of air conditioning system for vehicle, including electric expansion valve, the electric expansion valve includes: valve body, for limiting refrigerant By channel；Needle, for changing the flow of refrigerant；Electric drive, the electric drive have stepper motor with basis The rotation angle of the stepper motor controls the opening degree of the coolant channel by the movement needle；
It is characterized by further comprising: automotive air-conditioning controller；
The automotive air-conditioning controller, for acquiring the current operating condition of the stepper motor in electric expansion valve, according to stepping The current operating condition selection exciting current value corresponding with the current operating condition of motor；And by the exciting current value Be applied to the coil of the stepper motor in electric expansion valve mechanical part, the coil obtain it is electric after driving machine tool part needle fortune It is dynamic；When the current operating condition for acquiring stepper motor is initialization, preset initialization corresponding with initialization is selected Exciting current value；
When the current operating condition for acquiring stepper motor is position control, preset position corresponding with position control is selected Set control exciting current value；
The position control exciting current value is less than the initialization exciting current value.
7. air conditioning system for vehicle according to claim 6, which is characterized in that the automotive air-conditioning controller includes: automobile Air-conditioning center processor, stepper drive control module and drive module；
The air conditioning for automobiles center processor, for according to the selection of the current operating condition of stepper motor and the current operation work The corresponding exciting current value setting order of condition, and exciting current value setting order is sent to the stepper drive and is controlled Module；
The stepper drive control module generates corresponding exciting current value for setting order according to the exciting current value, And the drive module is sent to after being quantified the exciting current value；
The drive module, for the exciting current value after quantization to be applied to the coil of stepper motor.
8. air conditioning system for vehicle according to claim 7, which is characterized in that the air conditioning for automobiles center processor is used for It is ordered, is had according to the current operating condition of stepper motor selection exciting current value setting corresponding with the current operating condition Body are as follows:
When the current operating condition for acquiring stepper motor is initialization, preset initialization corresponding with initialization is selected Exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is less than in advance If transition location, then preset first exciting current value is selected；If the step number position of current stepper motor be greater than or Equal to default transition location, then preset second exciting current value is selected；
The first exciting current value is greater than the second exciting current value；
The first exciting current value and the second exciting current value are respectively less than the initialization exciting current value.
9. air conditioning system for vehicle according to claim 7, which is characterized in that the air conditioning for automobiles center processor is used for It is ordered, is had according to the current operating condition of stepper motor selection exciting current value setting corresponding with the current operating condition Body are as follows:
When the current operating condition for acquiring stepper motor is initialization, preset initialization corresponding with initialization is selected Exciting current value；
When the current operating condition for acquiring stepper motor is position control, if the step number position of current stepper motor is less than in advance If transition location, then preset first exciting current value is selected；If the step number position of current stepper motor be greater than or When equal to default transition location, when judging that refrigerant pressure or pressure difference are less than preset pressure threshold value, preset the is selected Five exciting current values when judging that refrigerant pressure or pressure difference are greater than or equal to preset pressure threshold value, select preset the Six exciting current values；
The 5th exciting current value is less than the 6th exciting current value；
The 5th exciting current value and the 6th exciting current value are respectively less than the initialization exciting current value.
10. air conditioning system for vehicle according to claim 7, which is characterized in that the air conditioning for automobiles center processor is used for It is ordered, is had according to the current operating condition of stepper motor selection exciting current value setting corresponding with the current operating condition Body are as follows:
Receive the signal of stepper motor stall；
Judge the current location of electric expansion valve whether in the threshold range of top position or bottom position；
If it is, judging that stepper motor is up the stall of generation；
If it is not, then maximum exciting current value is selected to be applied to the coil of stepper motor, electric expansion valve is described maximum It is initialized under exciting current value；It initializes and successfully then illustrates electric expansion valve there is no failure, if initialization failure, Then illustrate that electric expansion valve breaks down.
CN201310044536.9A 2013-02-04 2013-02-04 A kind of electric expansion valve and air conditioning system for vehicle Active CN103968621B (en)

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CN201310044536.9A CN103968621B (en) 2013-02-04 2013-02-04 A kind of electric expansion valve and air conditioning system for vehicle
JP2015555578A JP6254615B2 (en) 2013-02-04 2014-01-28 Electronic expansion valve and control method thereof
KR1020177032443A KR20170127059A (en) 2013-02-04 2014-01-28 Electronic expansion valve and control method thereof
PCT/CN2014/071615 WO2014117721A1 (en) 2013-02-04 2014-01-28 Electronic expansion valve and control method thereof
KR1020157023536A KR102013713B1 (en) 2013-02-04 2014-01-28 Electronic expansion valve and control method thereof
US14/764,820 US20150362236A1 (en) 2013-02-04 2014-01-28 Electronic expansion valve and control method thereof
EP14745487.0A EP2952835A4 (en) 2013-02-04 2014-01-28 Electronic expansion valve and control method thereof

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CN106322869B (en) * 2015-06-24 2019-05-31 浙江三花汽车零部件有限公司 The assemble method of refrigerant controller and refrigerant controller
CN106322867B (en) * 2015-06-24 2019-05-31 浙江三花汽车零部件有限公司 The control system and control method of refrigerant controller, the refrigerant controller
CN105425627B (en) * 2015-11-13 2018-03-13 湖北开特汽车电子电器系统股份有限公司 Automobile servo step motor based on LIN communication drivings
CN108692488B (en) * 2017-04-11 2021-05-28 浙江三花智能控制股份有限公司 Heat exchange system, air conditioner control system and control method of air conditioner system
CN107525317B (en) * 2016-06-21 2019-11-12 珠海格力电器股份有限公司 A kind of control device of electric expansion valve, air-conditioning and its discretionary protection method
CN107763284B (en) 2016-08-18 2023-07-11 浙江三花智能控制股份有限公司 Electronic expansion valve, control system and control method of control system
JP2019211179A (en) * 2018-06-07 2019-12-12 株式会社デンソー Valve device
CN112747507B (en) * 2021-01-21 2022-03-04 卡乐电子(苏州)有限责任公司 Drive control method and system of electronic expansion valve

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05256544A (en) * 1992-03-12 1993-10-05 Toshiba Corp Controlling device for electronic expansion valve of refrigerator
JP2002106745A (en) * 2000-10-03 2002-04-10 Toto Ltd Flow regulation valve
JP2011220451A (en) * 2010-04-09 2011-11-04 Saginomiya Seisakusho Inc Pulse driving device of motor-operated valve and control system of motor-operated valve having the same
CN102374328B (en) * 2010-08-27 2013-10-23 杭州三花研究院有限公司 Application of electronic expansion valve and stepper motor thereof to vehicle air conditioner

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