CN104515252A - Control method of electronic expansion valve - Google Patents
Control method of electronic expansion valve Download PDFInfo
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- CN104515252A CN104515252A CN201310455096.6A CN201310455096A CN104515252A CN 104515252 A CN104515252 A CN 104515252A CN 201310455096 A CN201310455096 A CN 201310455096A CN 104515252 A CN104515252 A CN 104515252A
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- expansion valve
- air
- electric expansion
- conditioning system
- initialization
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention provides a control method of an electronic expansion valve. The electronic expansion valve is applied to an air conditioning system of a vehicle; the air conditioning system comprises an air conditioning controller and an electronic expansion valve; the air conditioning system can send an initialization control signal according to the stored preset control program for the electronic expansion valve and an initialization triggering signal, so as to control the electronic expansion valve to perform initialization action; the initialization action is the confirming action for the full opening of the electronic expansion and aims at confirming that the electronic expansion valve can run in full opening degree; the initialization operation action of the electronic expansion valve can prevent the electronic expansion valve from stepping out during running, so as to avoid the influence of step-out accumulation after long-time operation on the control effect under normal working, and as a result, the air conditioning system can run stably.
Description
[technical field]
The present invention relates to a kind of control method of electric expansion valve, be specifically related to a kind of control method of the electric expansion valve be applied in vehicle air conditioner.
[background technology]
Electric expansion valve has been widely used in domestic air conditioning field as a kind of novel restricting element.Electric expansion valve can change the refrigerant flow of air-conditioning system flexibly according to the requirement of system, realize the effective control to the degree of superheat, thus realize the raising of the usefulness of system.Electric expansion valve is a kind of by the motion of stepper motor driven valve core, by aciculiform spool open degree, the size of adjustment valve port, thus the mechanism of adjustment refrigerant flow.
In domestic air-conditioning system, controller sends sequence of voltage pulses regularly to the coil of electric expansion valve stepper motor, each phase coil of stepper motor is made to carry out according to certain rules being energized and no power, reach the change of each pawl level magnetic of control coil stator regularly, and then control the rotation of rotor, the rotation of rotor drives moving up and down of needle, reaches the object of Flow-rate adjustment.In the non-moving type air-conditioning systems such as domestic air-conditioning system, residing for air-conditioning system, environment is relatively stable, and electric expansion valve carries out Flow-rate adjustment with fixed speed.
But in the movable air conditioner systems such as air conditioning system for vehicle, circumstance complication is changeable residing for air-conditioning system, air-conditioning system is needed to deal with in more intelligent mode flexibly the impact that environmental change brings air-conditioning system.How correctly to control electric expansion valve, make it under different working conditions, to perform different responsivenesses to adapt to the operating mode of acute variation, the Performance optimization improved as movable air conditioner systems such as car air-conditioners is seemed particularly important.
At car air-conditioner environment, at least following operating mode has the demand regulating electric expansion valve responsiveness:
Such as when the degree of superheat increases suddenly or the load such as rapid drawdown sharply changes, or when larger changes occurs for compressor, fan condition, wish that electric expansion valve is with the flow of the cold-producing medium of responsiveness adjustment faster, to reach the object of fast and stable system condition;
Again such as when air-conditioning system starts, wish that electric expansion valve navigates to responsiveness faster and preset fixing aperture;
Again such as when air-conditioning system is out of service, wish that electric expansion valve is beneficial to avoid high-low pressure to balance with the restriction of responsiveness closedown faster;
And when concussion appears in the degree of superheat, wish that electric expansion valve reduces responsiveness when the degree of superheat regulates; When duty ratio is lower, or when compressor control and expansion valve control to occur influencing each other, system easily occurs that the degree of superheat vibrate, now wishes the responsiveness by reducing electric expansion valve, is beneficial to reduction and the elimination of vibration.
In order to ensure air conditioning system for vehicle stable, run fast, first need to confirm that electric expansion valve can run in full gate, eliminate issuable step-out in electric expansion valve runs.
Therefore, be necessary to improve existing technology, to solve above technical problem.
[summary of the invention]
The object of the present invention is to provide a kind of control method of electric expansion valve, described air-conditioning system can control electric expansion valve and carry out full gate confirmation before performing an action, the problem that electric expansion valve operationally produces step-out can be eliminated, the stability that air-conditioning system is run can be ensured.
For achieving the above object, the present invention adopts following technical scheme: a kind of control method of electric expansion valve, described electric expansion valve is applied in vehicle air conditioner, described air-conditioning system can according to its memory store the control program for electric expansion valve preset and vehicle control information or initialize triggering signal send initialization control signal, make electric expansion valve complete initialization action; Described initialization action comprises the switch carrying out electric expansion valve full gate and confirms action, runs to predetermined aperture action, confirms that electric expansion valve can carry out the operation of full gate.
Described initialization control signal comprises initialization action control signal; Described initialization action control signal comprises to be made electric expansion valve run to 0 aperture, 100% aperture of reruning from current aperture then to run to a setting aperture or run to 100% aperture, 0 aperture of reruning from current aperture and then run to a setting aperture.
Described initialization control signal also comprises initialization action speed control signal, and the responsiveness of described electric expansion valve when initialization action is more than or equal to the maximum of the responsiveness of described electric expansion valve when Flow-rate adjustment.
Described initialization triggering signal produces when air-conditioning system powers on, and when sensor detects that air-conditioning system power positive cathode Electromotive Difference Of Potential is greater than the minimum voltage that air-conditioning system normally works, described air-conditioning system sends initialization control signal.
Described initialization triggering signal produces when the car key of vehicle has just forwarded ACC position to or produces when air-conditioning shuts down, when after the car key of described vehicle forwards ACC position to from ON position or after air-conditioning system shutdown, battery continues as air-conditioning system and powers, initialization control signal is sent after the car key that air-conditioning system collects Vehicular system is in ACC position signalling or air-conditioning system off signal, electric expansion valve performs initialization action, is finished and sends the power-off of feedback signal control air-conditioning system.
Produce when described initialization triggering signal produces when the car key of vehicle has just forwarded ACC position to or air-conditioning shuts down, when after the car key of described vehicle forwards ACC position to from ON position or after air-conditioning system shutdown, make battery continue as air-conditioning system to power a setting-up time t2 by arranging a delay routine, send initialization control signal after the car key that air-conditioning system collects Vehicular system is in ACC position signalling or air-conditioning system off signal, electric expansion valve performs initialization action; Wherein said setting-up time t2 is greater than the described electric expansion valve initialization action time.
Described initialization triggering signal is electric expansion valve fault-signal, and when the information that electric expansion valve feeds back to air-conditioning system occurs abnormal, air-conditioner controller is resolved abnormal information, sends initialization control signal.
Described air-conditioning system comprises air-conditioner controller, electric expansion valve, described air-conditioning system also comprises the automatically controlled part controlling electronic expansion valve events, described automatically controlled part carries out communication with described air-conditioner controller by the LIN/CAN bus in Vehicular system, and described electric control part is divided and is integrated on described electric expansion valve or arranges separately; Described air-conditioner controller is sent in described LIN/CAN bus after being compiled by initialization control signal, and the control signal in described automatically controlled part analysis LIN/CAN bus controls electronic expansion valve events.
Described air-conditioning system comprises air-conditioner controller, electric expansion valve, also comprise the automatically controlled part controlling electronic expansion valve events, described electric control part is divided and is integrated on described air-conditioner controller, the automatically controlled part Direct Communication of described air-conditioner controller and described control electric expansion valve; Described air-conditioner controller comprises air conditioning for automobiles central processing module and stepper drive control module; Described air conditioning for automobiles central processing module is responsible for the collection initializing triggering signal, send initialization control signal, and signal is converted into stepper drive value and the driving direction signal of stepper drive control module, stepper drive control module makes the current value of coil of electronic expansion valve meet the requirement of control signal, and electric expansion valve is performed an action.
Compared with prior art, air-conditioning system of the present invention can send control signal, makes electric expansion valve carry out initialization action, confirms that electric expansion valve can carry out the operation of full gate; Can eliminate and be in operation issuable step-out at electric expansion valve, control effects when step-out adds up and affects normal work after avoiding long-play, thus ensure the stable operation of air-conditioning system.The stability that air-conditioning system is run can be ensured like this.
[accompanying drawing explanation]
Fig. 1 is the schematic block diagram of the first embodiment of air-conditioning system of the present invention;
Fig. 2 is the schematic block diagram of the second embodiment of air-conditioning system of the present invention;
Fig. 3 is preconditioning first preconditioning input quantity and preconditioning target location relation schematic diagram in embodiment of the present invention;
When Fig. 4 is preconditioning in embodiment of the present invention, the variable quantity of the first preconditioning input quantity and preconditioning responsiveness relation schematic diagram;
When Fig. 5 is preconditioning in embodiment of the present invention, the second preconditioning input quantity and preconditioning target location relation schematic diagram;
Fig. 6 is variable quantity and the preconditioning responsiveness relation schematic diagram of preconditioning second preconditioning input quantity in embodiment of the present invention;
When Fig. 7 is negative-feedback regu-lation in embodiment of the present invention, the relation schematic diagram of current aperture and negative-feedback regu-lation speed base;
When Fig. 8 is negative-feedback regu-lation in embodiment of the present invention, the absolute value of the difference of current aperture and target aperture and the relation schematic diagram of negative-feedback regu-lation speed increment;
Fig. 9 is the control flow schematic diagram of Air-condition system control electronic expansion valve events of the present invention.
[detailed description of the invention]
Below in conjunction with the drawings and specific embodiments, the invention will be further described, is specifically specifically described for a kind of automotive air-conditioning system:
As shown in Figure 1 to Figure 2, the invention discloses a kind of air-conditioning system 100, air-conditioning system 100 comprises air-conditioner controller 1 and electric expansion valve 2, air-conditioning system 100 also comprises the automatically controlled part 4 for controlling electronic expansion valve events, and automatically controlled part 4 can arrange separately or be integrated on air-conditioner controller 1 or electric expansion valve 2.
First embodiment of the invention, as shown in Figure 1, air-conditioning system 100 comprises air-conditioner controller 1 and electric expansion valve 2, air-conditioning system 100 also comprises the automatically controlled part 4 for controlling electric expansion valve 2 action, automatically controlled part 4 and air-conditioner controller 1 carry out communication by the LIN/CAN bus 3 of automobile, and automatically controlled part 4 is integrated on electric expansion valve 2.
Air-conditioner controller 1 comprises air conditioning for automobiles central processing module 11 and the first signal transmitting and receiving module 12; Air conditioning for automobiles central processing module 11 is responsible for receiving Air-condition system control panel input signal or sensor signal; First signal transmitting and receiving module 12, sends to air conditioning for automobiles central processing module 11 after being sent to LIN/CAN bus and receiving the feedback signal parsing in LIN/CAN bus 3 after being responsible for signal compiling air conditioning for automobiles central processing module 11 sent;
Automatically controlled part 4 comprises secondary signal transceiver module 41, central processing module 42, stepper drive control module 43;
Secondary signal transceiver module 41, is responsible for the control signal of resolving LIN/CAN bus 3, and sends to central processing module 42; Be sent in LIN/CAN3 bus after the feedback signal of electric expansion valve 2 being compiled simultaneously; Secondary signal transceiver module 41 receives the frame (frame) of the control signal composition in LIN/CAN bus 3, issues central processing module 42 after the voltage level conversion to the data signal of component frame, and central processing module 42 is responsible for resolving the implication of frame.
First central processing module 42 judges the frame identifier in frame head, and when the result judged, to be this frame information be points to the command frame of electric expansion valve 2, then central processing module 42 received frame response section resolving wherein control signal further;
When to be requirement electric expansion valve 2 go to a new aperture from an aperture to the result of resolving, central processing module 42 calculates according to current aperture and new opening information and is supplied to the stepping value of stepper drive control module 43 and the driving direction of motor;
Stepper drive control module 43 receives step value and motor driving direction signal, make the curent change flowing through electric expansion valve A phase coil and B phase coil meet the requirement in described stepping value and driving stepper motor direction, the current value of same A phase coil and B phase coil feeds back to central processing module 42.
Electric expansion valve 2 comprises stepper motor and valve body, and stepper motor is according to the current value application valve body action of coil.
In the first embodiment, air-conditioning system can by wherein a kind of to electric expansion valve action control in following two kinds of modes:
First kind of way: electric expansion valve action control signal is sent by air-conditioner controller 1, air-conditioner controller 1 air conditioning for automobiles central processing module 11 is specifically had to send, and give different priority to control signal, the control signal that priority is higher is more first to be performed by electric expansion valve;
The air conditioning for automobiles central processing module 11 of air-conditioner controller 1 is responsible for receiving Air-condition system control panel input signal or sensor signal and is obtained speed of service control signal and opening control signal in conjunction with the feedback signal stored in the control program stored in its memory and/or its memory through computing, and by described speed of service control signal with run opening control signal and send to the first signal transmitting and receiving module 12; First signal transmitting and receiving module 12 way of compiling control signal is also sent in LIN/CAN bus 3; The secondary signal transceiver module of automatically controlled part 4 reception control signal resolving in LIN/CAN bus 3, and the control signal of parsing is sent to central processing module 42, control signal is converted to control signal to calculate and is supplied to the stepping value of stepper drive control module 43 and the driving direction of motor by central processing module 42; Stepper drive control module 43 receives the speed of service and target opening control signal, make the curent change flowing through electric expansion valve A phase coil and B phase coil meet the requirement in described stepping value and driving stepper motor direction, the current value of same A phase coil and B phase coil feeds back to central processing module 42;
The second way: electric expansion valve action control signal is sent by the central processing module 42 of automatically controlled part 4, and gives different priority to control signal, the control signal that priority is higher is more first to be performed by electric expansion valve;
The air conditioning for automobiles central processing module 11 of air-conditioner controller 1 is responsible for receiving Air-condition system control panel input signal or sensor signal, LIN/CAN bus 3 is sent to after the first signal transmitting and receiving module 11 compiles, secondary signal transceiver module 41 issues central processing module 42 after receiving the signal resolution of LIN/CAN bus 3, central processing module 42 Received signal strength also obtains electric expansion valve speed of service control signal and operation opening control signal in conjunction with the feedback signal stored in the control program stored in its memory and/or its memory through computing after resolving, and control signal is calculated according to current aperture and new opening information be supplied to the stepping value of stepper drive control module 43 and the driving direction of motor, control electric expansion valve 2 action.
The second embodiment of the present invention, as shown in Figure 2, air-conditioning system 100 comprises air-conditioner controller 1 and electric expansion valve 2, and air-conditioning system 100 also comprises the automatically controlled part 4 for controlling electronic expansion valve events, and automatically controlled part 4 is integrated on air-conditioner controller 1.
Air-conditioner controller 1 comprises air conditioning for automobiles central processing module 11 and stepper drive control module 41; Wherein the function of stepper drive control module is identical with functions of modules corresponding in the first embodiment; The function of air conditioning for automobiles central processing module 1 comprises the function of the original function of air conditioning for automobiles central processing module in the first embodiment and central processing module.
In present embodiment, air-conditioning system controls electronic expansion valve events in the following manner: air conditioning for automobiles central processing module 11 is responsible for receiving Air-condition system control panel input signal or sensor signal and is obtained speed of service control signal and opening control signal in conjunction with the feedback signal stored in the control program stored in its memory and/or its memory through computing, and control signal is calculated according to current aperture and new opening information and be supplied to the stepping value of stepper drive control module 43 and the driving direction of motor; Stepper drive control module 43 receives the speed of service and target opening control signal, make the curent change flowing through electric expansion valve A phase coil and B phase coil meet the requirement in described stepping value and driving stepper motor direction, the current value of same A phase coil and B phase coil feeds back to air conditioning for automobiles central processing module 11.
Compared with the first embodiment, the electric control part that the air-conditioning system 100 of present embodiment controls electric expansion valve is divided and is integrated on air-conditioner controller 1, Direct Communication between such electric expansion valve and air-conditioner controller 1, do not need by LIN/CAN bus, eliminate signal transmitting and receiving module, central processing module is incorporated in air conditioning for automobiles central processing module simultaneously, makes air-conditioning system compacter.
Air-conditioning system of the present invention can send control signal, makes electric expansion valve complete following action:
Initialization action: air-conditioning system can according to its memory store the control program for electric expansion valve preset and vehicle control information or initialize triggering signal, send initialization control signal, make electric expansion valve complete initialization action; Described initialization action comprises the switch carrying out electric expansion valve full gate and confirms action, runs to predetermined aperture action, confirms that electric expansion valve can carry out the operation of full gate; The initialization run action of electric expansion valve can be eliminated and be in operation issuable step-out at electric expansion valve, after avoiding long-play, step-out adds up and affects control effects when normally working, thus ensures stable operation and the quick-reaction capability of air-conditioning system.
Initialization control signal comprises initialization action and initialized responsiveness control signal; Described initialization action control signal comprises to be made electric expansion valve run to 0 aperture, 100% aperture of reruning from current aperture then to run to a setting aperture or run to 100% aperture, 0 aperture of reruning from current aperture and then run to a setting aperture; The initialized responsiveness that described air-conditioning system sends is more than or equal to the maximum of the responsiveness of electric expansion valve when Flow-rate adjustment, and usual described initialization action speed is with fixed value, and the performance according to air-conditioning system is demarcated; In actual use, in order to prevent electronic expansion state internal valve step-out in running, the umber of pulse that usual electric expansion valve runs exceedes the umber of pulse of electric expansion valve from the operation aperture of 0-100%; Such as: it is desirable that 500 pulses when electric expansion valve is from 0 aperture to 100% aperture, the initialization action of electric expansion valve runs 600 pulses from current aperture forward, then inverted running 600 pulses, and last forward runs certain pulse to setting aperture; Or from 600 pulses of current aperture inverted running, then forward runs 600 pulses, the certain pulse of last inverted running is to setting aperture.
Described initialization triggering signal produces when the powering on of air-conditioning system, air-conditioning shutdown time produce or the key of vehicle has just forwarded ACC position to time produce;
Described initialization triggering signal produces when described air-conditioning system powers on, vehicle control system is by judging whether the electrical potential difference of air-conditioning system power positive cathode is greater than minimum voltage when air-conditioning system normally works, and if so, then indicates power on signal, if not, then indicate without power on signal; If there is power on signal, the control program for electric expansion valve preset that air-conditioning system can store according to its memory and power on signal, send initialization control signal, make electric expansion valve complete initialization action; When described initialization triggering signal is the power on signal of air-conditioning system, can confirm the running status of electric expansion valve before electric expansion valve carries out Flow-rate adjustment, ensure the normal operation of system.
Described initialization triggering signal produces when described air-conditioning system shutdown, when triggering the shut down switch of air-conditioning system, battery continues as air-conditioning system and powers, the off signal that air-conditioning system collects air-conditioning system sends initialization control signal, electric expansion valve performs initialization action, is finished and sends the power-off of feedback signal control air-conditioning system; Make battery continue as air-conditioning system to power a setting-up time t2 by arranging a delay routine, air-conditioning system sends initialization control signal after collecting the air-conditioning system off signal of Vehicular system, and electric expansion valve performs initialization action; Wherein said setting-up time t2 is greater than the described electric expansion valve initialization action time; The operation conditions that not only can confirm electric expansion valve full gate is run for the initialization performed after air-conditioning system shutdown, ensures the stability that air-conditioning system is run; And the stand-by period avoiding when powering on, improve the quick-reaction capability of air-conditioning system.
Described initialization triggering signal is that the car key of vehicle produces when just having forwarded ACC position to, when the key of vehicle forwards ACC position to from ON position, produces and initializes triggering signal; Battery continues as air-conditioning system and powers, and the car key that air-conditioning system collects Vehicular system is in ACC position signalling and sends initialization control signal, and electric expansion valve performs initialization action, is finished to send feedback signal and control air-conditioning system power-off; Or make battery continue as air-conditioning system to power a setting-up time t2 by arranging a delay routine, send initialization control signal after the car key that air-conditioning system collects Vehicular system is in ACC position signalling or air-conditioning system off signal, electric expansion valve performs initialization action; Wherein said setting-up time t2 is greater than the described electric expansion valve initialization action time.
Certain described initialization triggering signal also can for the target aperture of electric expansion valve fault-signal or electric expansion valve be 0 or 100% time opening amount signal; Make electric expansion valve can carry out initialization when needs to confirm; It is the confirmation carrying out electric expansion valve full gate that described initialization runs, and confirm that electric expansion valve can carry out the operation of full gate, so wish action, more block is better, can save time like this; Therefore air-conditioning system sends maximum speed of service control signal to electric expansion valve.
Preconditioning action: when according to the program that self stores, described air-conditioning system judges that the signal gathered contains preconditioning triggering signal and triggering signal is effective, sends preconditioning target opening control signal and preconditioning responsiveness control signal to electric expansion valve; Described preconditioning triggering signal is the preconditioning input quantity relevant with compressor rotary speed or discharge capacity or evaporator fan rotating speed, and the preconditioning target aperture of the larger correspondence of preconditioning input quantity is larger, and the variable quantity larger preconditioning responsiveness of preconditioning input quantity is larger; Described preconditioning input quantity is divided into some intervals, each interval corresponding preconditioning target aperture, and described preconditioning input quantity variable quantity is divided into some intervals, each interval corresponding preconditioning speed; Described preconditioning triggering signal is positioned at one of them interval, when controlling in working cycles change between preconditioning signals generating region air-conditioning system two and when keeping a setting-up time t1 in new interval, preconditioning triggering signal is just effective, air-conditioning system sends the preconditioning target opening control signal corresponding with between new district and preconditioning responsiveness control signal, and electric expansion valve performs an action; One of wherein said air-conditioning system controls working cycles and refers to that air-conditioning system is from collection signal to the time period sending control signal, and described setting-up time t1 is the integral multiple of Air-condition system control working cycles.
As Figure 3-Figure 4, a kind of preconditioning Function implementation mode, control the variable preconditioning input quantity of preconditioning target location, the variable controlling preconditioning responsiveness is the variable quantity of preconditioning input quantity, by L0 ~ L7 and L0 ' ~ L7 ', the variable quantity of preconditioning input quantity and preconditioning input quantity is divided into 6 intervals, its preconditioning target location value and governing speed correspond respectively to R1 ~ R6 and Sr1 ~ Sr6, wherein Fig. 3 is the relation of preconditioning target location value and preconditioning input quantity, and Fig. 4 is the relation of the variable quantity of preconditioning speed and preconditioning input quantity.Wherein L0 ~ L7, L0 ' ~ L7 ', R1 ~ R6, Sr1 ~ Sr6 all need rule of thumb to demarcate with system experimentation result, and interval number is not limited to diagram 6, can adjust accordingly according to the actual conditions of system, for preconditioning input quantity for compressor rotary speed, the one providing L0 ~ L7 herein may situation be 0/1000/2000/3000/4000/5000/6000 revolutions per second; Corresponding R1 ~ R6 is 50/90/120/140/150/160 step; Corresponding Sr1 ~ Sr6 is 50/70/90/110/130/150.Described preconditioning functional characteristics is for first to judge whether containing preconditioning triggering signal, major function changes between preconditioning triggering signal generating region, and in new interval, keep a setting-up time length t1, just carry out preconditioning output (namely this preconditioning mode is discontinuity), prevent from producing unnecessary preconditioning, to improve the stability of system due to instantaneous working conditions change (immediately recalling to as having after and then braking after suddenly stepping on the gas, adjusting evaporator fan rotating speed).
As shown in Fig. 5-Fig. 6, another kind of preconditioning Function implementation mode, different from the interval preconditioning in the first embodiment, the present embodiment is continuous preconditioning, is specially piecewise function.Be described as follows: piecewise function preconditioning refers to according to several critical point as diagram L1, L2, L3 and L1 ', L2 ', L3 ' be as the critical point of piecewise function, with the variable quantity of preconditioning input quantity and preconditioning input quantity for variable, in each is interval, adopts the function corresponding with system fading margin demand between location to carry out preconditioning, and exports and preconditioning aperture En corresponding between location and corresponding governing speed Sen; Wherein preconditioning aperture En and corresponding governing speed Sen is respectively the function of preconditioning collection signal, and described function may be one or many function, determines this functional relation by experience and system experimentation.Continuity preconditioning can, with piecewise function form, also can be repeatedly function according to system requirements, and feature is that preconditioning and negative-feedback regu-lation all continue to carry out.
Preconditioning operation function before electric expansion valve enters accurately control, carries out an estimation drawn based on experience and experimental data in advance rapidly regulate, object shortens air-conditioner control system to the electronic expansion valve controls time, make air-conditioning system reach balance fast, and meet the refrigerating capacity required for air-conditioning system fast.
For vehicle air conditioner, preconditioning triggering signal generally comes sensor and/or LIN/CAN bus.
Negative-feedback action: air-conditioning system is according to the operation aperture of the temperature and pressure signal determination electric expansion valve of the evaporator outlet in refrigeration system in the current location of electric expansion valve and the air-conditioning system of collection and the speed of service; The negative-feedback speed of service of described electric expansion valve comprises negative-feedback regu-lation speed base and negative-feedback regu-lation speed increment two parts; As shown in Figure 7, the current aperture that described electric expansion valve negative-feedback regu-lation speed base feeds back with electric expansion valve is for variable, by M0-M6, current for feedback aperture is divided into 7 intervals, corresponding 7 governing speed radix S1-S7, the definition in its concrete aperture interval and the value of the concrete governing speed of correspondence need be demarcated according to different system, M0 ~ M6 is respectively herein: 0/30/50/70/90/150/300 step, S1 ~ S7 is respectively 10/15/20/30/40/60/80.When electric expansion valve is current be in small guide vane interval time, namely now air-conditioning system is in underrun state, now refrigerant flow is less, therefore refrigeration system is to the sensitive of aperture, now need to adopt alap speeds control electronic expansion valve events, prevent the refrigeration system degree of superheat concussion caused because electric expansion valve responsiveness is too fast, the too fast electric expansion valve that also can make of regulating frequency acts frequently simultaneously, affects its service life; But along with the increase of the current aperture of electric expansion valve, namely the load of system cloud gray model is more and more higher, now need the responsiveness progressively increasing electric expansion valve, to guarantee the aperture reached as quickly as possible under the prerequisite that the degree of superheat is stable required for system.
As shown in Figure 8, using the absolute value of the difference of target aperture and the current aperture quadratic function that is variable as a kind of scheme of computational speed increment of adjustment;
Electronic expansion valve opening is adjusted between the smaller area close to desired value and even just in time reaches desired value by negative-feedback regu-lation process further.
Quick shutoff action: in conjunction with the program of setting themselves after air-conditioner controller 1 collects quick shutoff triggering signal, or automatically controlled part combines the control program of the electronic expansion valve events preset after receiving the quick shutoff triggering signal of air-conditioner controller collection, send complete shut-down control signal and maximum speed of service control signal, make electric expansion valve close pipe for flowing of refrigerant road with the fastest speed; Quick shutoff triggering signal comprises vehicle collision signal; Described air-conditioner controller 1 directly reads the collision trigger signal of vehicle from the LIN/CAN bus of vehicle, the collision trigger signal of described vehicle can for controlling the sensor signal of air bag; During vehicle collision, control electric expansion valve causes cold-producing medium to enter in a large number in driver's cabin after turning off fast and can preventing vehicle collision; Some vehicle power supply after collecting vehicle expanding signal can cut off, automatically in order to ensure that the operation of electric expansion valve may increase by an additional supply be connected with electric expansion valve.
The priority of described quick shutoff control signal is greater than the priority of described initialization control signal, the priority of described initialization control signal is greater than the priority of described preconditioning control signal, and the priority of described preconditioning control signal is greater than the priority of described negative-feedback regu-lation control signal; Quick shutoff control signal is performed by electric expansion valve at first, improves the security of vehicle.
As shown in Figure 9, the invention also discloses a kind of air conditioner system control method, a kind of air conditioner system control method, described air-conditioning system comprises air-conditioner controller 1, electric expansion valve 2 and the automatically controlled part 4 for controlling electric expansion valve, described air-conditioning system can realize electric expansion valve action control, described air-conditioner controller or described automatically controlled part are according to the program preset and the input signal collected, send different action control signals, make electric expansion valve carry out action with different responsivenesses; Described air-conditioning system running comprises the following steps:
S1: pre-set control programs: the control program that described air-conditioner controller or described automatically controlled part storage preset;
S2: control signal is formed: the program preset that air-conditioner controller or described automatically controlled part store in conjunction with self and the triggering signal collected, send speed of service control signal and predetermined opening control signal, control electronic expansion valve events, described control signal does not give different priority; Priority is more high more first to be performed by electric expansion valve;
S3: actuating signal is formed and performs: described control signal, through the described automatically controlled actuating signal being partially converted into electric expansion valve and can performing, makes electric expansion valve run to described predetermined aperture adjusting refrigerant flow rate with the described speed of service.
The described electronic expansion valve controls program preset comprises initialization control program, preconditioning control program, negative-feedback regu-lation control program and turns off control program fast;
Wherein said step S2 comprises following sub-step:
S21: upper electro-detection: air-conditioner controller judges whether air conditioner power source both positive and negative polarity electrical potential difference is greater than air-conditioning system minimum, if so, represents that air-conditioning has power on signal, forwards step S22 and S23 to; If not, represent that air-conditioning is without power on signal, forwards step S00 to;
S22: initialize and control: air-conditioner controller or automatically controlled part combine and initialize control program, sends initialization command and initializes speed of service control signal;
S23: cut-off signals reads fast: air-conditioner controller reads vehicle-state coherent signal from the LIN/CAN bus of vehicle, forwards step S24 to;
S24: turn off control fast: air-conditioner controller or automatically controlled part combine initialization control program and judged whether collision alarm, if so, send complete shut-down signal and the maximum speed of service; If not, step S25 is forwarded to;
S25: air-conditioning system open detection: air-conditioner controller judges the whether unlatching of compressor, if so, proceeds to step S26, if not, proceeds to step S20;
S26: input signal collection: air-conditioner controller reads input signal from the LIN/CAN bus of sensor and vehicle; Proceed to step S27;
S27: preconditioning controls: judge whether the signal that air-conditioner controller reads comprises preconditioning triggering signal, if proceed to step S28 according to preconditioning control program; If not, step S29 is proceeded to;
S28: air-conditioner controller or automatically controlled part calculate and generate preconditioning aperture and preconditioning governing speed, and send preconditioning opening control signal and preconditioning responsiveness signal;
S29: negative-feedback regu-lation controls: temperature, the pressure signal of the current location that air-conditioner controller feeds back according to electric expansion valve and evaporator outlet carry out negative-feedback regu-lation, air-conditioner controller or electric control part divide the responsiveness sending negative-feedback regu-lation amount and correspondence, then proceed to step S20;
S20: power-off judges: air-conditioner controller judges whether the electromotive force of air-conditioning system power supply is less than the minimum operational potential of air-conditioning system power supply, if so, proceeds to step S00; If not, step S23 is proceeded to;
S00: terminate.
Certain described initialization controls also before power-off judges, namely to send electric expansion valve when car key is in closed condition and carry out initialized control signal, send feedback signal and control air-conditioning system power-off when electric expansion valve executes initialization command.
It should be noted that: above embodiment is only for illustration of the present invention and unrestricted technical scheme described in the invention, although this description reference the above embodiments are to present invention has been detailed description, but, those of ordinary skill in the art is to be understood that, person of ordinary skill in the field still can modify to the present invention or equivalent replacement, and all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, all should be encompassed in right of the present invention.
Claims (9)
1. the control method of an electric expansion valve, described electric expansion valve is applied in vehicle air conditioner, described air-conditioning system can according to its memory store the control program for electric expansion valve preset and vehicle control information or initialize triggering signal send initialization control signal, make electric expansion valve complete initialization action; Described initialization action comprises the switch carrying out electric expansion valve full gate and confirms action, runs to predetermined aperture action, confirms that electric expansion valve can carry out the operation of full gate.
2. the control method of electric expansion valve according to claim 1, is characterized in that: described initialization control signal comprises initialization action control signal; Described initialization action control signal comprises to be made electric expansion valve run to 0 aperture, 100% aperture of reruning from current aperture then to run to a setting aperture or run to 100% aperture, 0 aperture of reruning from current aperture and then run to a setting aperture.
3. the control method of the air-conditioning system of applying electronic expansion valve according to claim 2, it is characterized in that: described initialization control signal also comprises initialization action speed control signal, the responsiveness of described electric expansion valve when initialization action is more than or equal to the maximum of the responsiveness of described electric expansion valve when Flow-rate adjustment.
4. the control method of the electric expansion valve according to any one of claim 1-3, it is characterized in that: described initialization triggering signal produces when air-conditioning system powers on, when sensor detects that air-conditioning system power positive cathode Electromotive Difference Of Potential is greater than the minimum voltage that air-conditioning system normally works, described air-conditioning system sends initialization control signal.
5. the control method of the electric expansion valve according to any one of claim 1-3, it is characterized in that: described initialization triggering signal produces when the car key of vehicle has just forwarded ACC position to or produces when air-conditioning shuts down, when after the car key of described vehicle forwards ACC position to from ON position or after air-conditioning system shutdown, battery continues as air-conditioning system and powers, initialization control signal is sent after the car key that air-conditioning system collects Vehicular system is in ACC position signalling or air-conditioning system off signal, electric expansion valve performs initialization action, be finished and send the power-off of feedback signal control air-conditioning system.
6. the control method of the electric expansion valve according to any one of claim 1-3, it is characterized in that: produce when described initialization triggering signal produces when the car key of vehicle has just forwarded ACC position to or air-conditioning shuts down, when after the car key of described vehicle forwards ACC position to from ON position or after air-conditioning system shutdown, make battery continue as air-conditioning system to power a setting-up time t2 by arranging a delay routine, initialization control signal is sent after the car key that air-conditioning system collects Vehicular system is in ACC position signalling or air-conditioning system off signal, electric expansion valve performs initialization action, wherein said setting-up time t2 is greater than the described electric expansion valve initialization action time.
7. the control method of the electric expansion valve according to any one of claim 1-3, it is characterized in that: described initialization triggering signal is electric expansion valve fault-signal, when the information that electric expansion valve feeds back to air-conditioning system occurs abnormal, air-conditioner controller is resolved abnormal information, sends initialization control signal.
8. the control method of the electric expansion valve according to any one of claim 1-7, it is characterized in that: described air-conditioning system comprises air-conditioner controller, electric expansion valve, described air-conditioning system also comprises the automatically controlled part controlling electronic expansion valve events, described automatically controlled part carries out communication with described air-conditioner controller by the LIN/CAN bus in Vehicular system, and described electric control part is divided and is integrated on described electric expansion valve or arranges separately; Described air-conditioner controller is sent in described LIN/CAN bus after being compiled by initialization control signal, and the control signal in described automatically controlled part analysis LIN/CAN bus controls electronic expansion valve events.
9. the control method of the electric expansion valve according to any one of claim 1-7, it is characterized in that: described air-conditioning system comprises air-conditioner controller, electric expansion valve, also comprise the automatically controlled part controlling electronic expansion valve events, described electric control part is divided and is integrated on described air-conditioner controller, the automatically controlled part Direct Communication of described air-conditioner controller and described control electric expansion valve; Described air-conditioner controller comprises air conditioning for automobiles central processing module and stepper drive control module; Described air conditioning for automobiles central processing module is responsible for the collection initializing triggering signal, send initialization control signal, and signal is converted into stepper drive value and the driving direction signal of stepper drive control module, stepper drive control module makes the current value of coil of electronic expansion valve meet the requirement of control signal, and electric expansion valve is performed an action.
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Effective date of registration: 20170508 Address after: 310018 No. 301, No. 12, Hangzhou economic and Technological Development Zone, Zhejiang Province Applicant after: Zhejiang Sanhua Automobile Components Co., Ltd. Address before: 310018 No. 290-2, No. 12, Hangzhou economic and Technological Development Zone, Zhejiang Applicant before: Hangzhou Sanhua Institute Co., Ltd. |
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