CN114135707A - ERV automatic temperature control valve and full-off position positioning method and temperature control method thereof - Google Patents
ERV automatic temperature control valve and full-off position positioning method and temperature control method thereof Download PDFInfo
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- CN114135707A CN114135707A CN202111287625.7A CN202111287625A CN114135707A CN 114135707 A CN114135707 A CN 114135707A CN 202111287625 A CN202111287625 A CN 202111287625A CN 114135707 A CN114135707 A CN 114135707A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/046—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor with electric means, e.g. electric switches, to control the motor or to control a clutch between the valve and the motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/03—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P8/00—Arrangements for controlling dynamo-electric motors rotating step by step
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P8/00—Arrangements for controlling dynamo-electric motors rotating step by step
- H02P8/14—Arrangements for controlling speed or speed and torque
- H02P8/20—Arrangements for controlling speed or speed and torque characterised by bidirectional operation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Temperature-Responsive Valves (AREA)
Abstract
The invention discloses a method for positioning the full-off position of an ERV automatic temperature control valve, which comprises the following steps: and controlling a motor to drive a push rod to retract a preset distance I in a valve opening direction, then controlling the motor to drive the push rod to gradually push out a preset distance II in a valve closing direction, monitoring a voltage value corresponding to a phase pulse current loaded on the motor in a valve closing process, stopping closing the valve when the voltage value is greater than or equal to a threshold value, and storing the position of the push rod, namely the position of a full-close point. The method has the beneficial effect that the position of the full-off point of the valve body can be accurately determined by probing without a position sensor. The invention also discloses a temperature control method, and the temperature can be adjusted only by adjusting the retraction distance of the push rod from the full-off position to the valve opening direction. The invention also discloses an ERV automatic temperature control valve which comprises a valve body, a motor, an MCU and a voltage monitoring module and has the advantages of less power consumption and accurate control of the opening degree of the valve body.
Description
Technical Field
The invention relates to the technical field of automatic temperature control valve bodies. More particularly, the invention relates to an ERV automatic temperature control valve and a full-off position positioning method and a temperature control method thereof.
Background
An ERV automatic temperature control valve is a small-sized temperature control valve, the temperature is adjusted by opening and closing of a valve body or the opening degree of the valve body, the operation of the valve body is realized by depending on a position sensor, the opening and closing position of the valve body is directly or indirectly positioned, for example, a photoelectric coupling device is used as a sensor to monitor the number of turns of the motor; a "travel switch" is used as a sensor to position or limit travel, etc. The method has the advantages that the software control is simple and easy to realize, and the defects are that the cost of electronic devices is increased, the difficulty of typesetting is increased compared with the circuit board of the automatic temperature control valve which is a product with small appearance, and the miniaturization of the product is not facilitated, so that the research on a valve body switch positioning method without the help of a position sensor is the key point of the miniaturization of the automatic temperature control valve.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
Still another object of the present invention is to provide a method for positioning the full-off position of an ERV automatic temperature control valve, which can precisely determine the full-off position of the valve body by probing without using a position sensor.
The temperature control method is provided, and the temperature can be adjusted only by adjusting the retraction distance of the push rod from the full-off position to the valve opening direction.
The ERV automatic temperature control valve has the advantages of less power consumption and no need of a position sensor, and can accurately control the opening of the valve body.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a method for locating a full off position of an ERV automatic temperature control valve, comprising the steps of:
and controlling a motor to drive a push rod to retract a preset distance I in a valve opening direction, then controlling the motor to drive the push rod to gradually push out a preset distance II in a valve closing direction, monitoring a voltage value corresponding to a phase pulse current loaded on the motor in a valve closing process, stopping closing the valve when the voltage value is greater than or equal to a threshold value, and storing the position of the push rod, namely the position of a full-close point.
Preferably, the preset distance i is 5.6mm, the preset distance ii is 5.5mm, and the threshold is 0.12V.
Preferably, the method of claim 1 is repeated N times, with the nth full off-point position as the final full off-point position, where N is an integer greater than or equal to 10.
Preferably, an end point threshold value is set, if a voltage value greater than or equal to the threshold value is not monitored in the valve closing process, the motor continues to drive the push rod to push out according to a preset distance II, the valve closing is stopped until the monitored voltage value is greater than or equal to the end point threshold value, and the position of the push rod is the full-close point position and is stored, wherein the end point threshold value is greater than or equal to the threshold value.
The temperature control method of the ERV automatic temperature control valve based on the positioning method comprises the following steps: and adjusting the distance for the motor to drive the push rod to retract from the fully-closed position to the valve opening direction, calculating the inflow of hot water in unit time, and adjusting the ambient temperature to a preset target temperature.
The ERV automatic temperature control valve based on the temperature control method comprises the following steps:
the valve body is provided with a push rod, the push rod is connected with a motor, and the motor drives the push rod to retract and push out so as to control the opening and closing of the valve body;
the MCU is connected with the motor, a preset distance I, a preset distance II and a threshold value are stored in the MCU, the MCU controls the motor to drive the push rod to retract to the valve opening direction by the preset distance I, then controls the motor to drive the push rod to gradually push out towards the valve closing direction, the MCU judges that when the monitored voltage value corresponding to the phase pulse current loaded on the motor is larger than or equal to the threshold value, the motor is controlled to stop, the position of the push rod at the moment is recorded, namely the position of the full-closing point, and the maximum distance pushed out towards the valve closing direction by the push rod is the preset distance II;
and the voltage monitoring module is used for monitoring a voltage value corresponding to the phase pulse current loaded to the motor in the valve closing process.
Preferably, the method further comprises the following steps:
a temperature sensor for detecting an ambient temperature;
a data input terminal for inputting a control target;
the MCU calculates the inflow amount of hot water required in unit time according to a control target and the ambient temperature, calculates the opening of the valve body, and controls the motor to drive the push rod to retract towards the valve opening direction or push the push rod towards the valve closing direction until the calculated opening of the valve body is matched.
Preferably, the data input end is a key and/or a mobile end connected with the MCU through ZigBee communication.
Preferably, the system further comprises a display screen for displaying the human-computer interaction information.
Preferably, the automatic thermostatic valve is powered by a battery.
The invention at least comprises the following beneficial effects: the full-off position can be judged according to the threshold value without the help of a position sensor, the full-off position does not need to be repositioned in the process of controlling the opening and closing of the valve body before, only the current full-off position needs to be recorded, the position sensor is saved in circuit design, the cost is reduced, the product miniaturization is facilitated, the mechanical position of the position sensor is calibrated without being adjusted before leaving a factory, the positioning success rate is high, and the motor or the valve body fails.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a flow chart of the starting process of the ERV automatic temperature control valve in one technical scheme of the invention;
FIG. 2 is a flow chart of the ERV automatic temperature control valve 'precise positioning valve full-close position task' according to one technical scheme of the invention;
FIG. 3 is a flow chart of the interrupt processing of the timer 3 in the task of accurately positioning the fully-closed position of the valve of the ERV automatic temperature control valve according to one embodiment of the present invention;
fig. 4 is a flow chart of an auxiliary task (detecting locked-rotor current) of accurately positioning the fully-closed valve position of the ERV automatic thermostatic valve according to one embodiment of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 4, the present invention provides a method for positioning a full-off position of an ERV automatic temperature control valve, comprising the following steps:
and controlling a motor to drive a push rod to retract a preset distance I in a valve opening direction, then controlling the motor to drive the push rod to gradually push out a preset distance II in a valve closing direction, monitoring a voltage value corresponding to a phase pulse current loaded on the motor in a valve closing process, stopping closing the valve when the voltage value is greater than or equal to a threshold value, and storing the position of the push rod, namely the position of a full-close point.
In the technical scheme, after the motor and the push rod of the valve body are connected, a judgment value of the current full closing under the combination of the motor and the valve body is obtained by repeatedly detecting the push rod in the process of pushing out the push rod to the valve closing direction till the voltage value corresponding to the phase current pulse loaded on the motor in the process of full closing, then the judgment value is stored in a control circuit in advance as a threshold value, after the initial installation or initialization, the push rod is driven to withdraw to the valve opening direction by controlling the motor, then the motor drive rod is controlled to gradually push out, the full-closing position can be judged according to the threshold value without the help of a position sensor, the full-closing position does not need to be repositioned in the process of controlling the opening and closing of the valve body afterwards, only the full-closing position at the current time needs to be recorded, and the number of rotation turns or the number of steps of the motor is usually adopted in the full-closing position, the distance of withdrawing and pushing the push rod can be accurately grasped, and therefore a data base is laid for controlling the temperature through the opening degree of the valve body. The use of the position sensor is saved in the circuit design, the cost is reduced, the miniaturization of the product is facilitated, the mechanical position of the calibration position sensor does not need to be adjusted before leaving a factory, the positioning success rate is high, and the motor or the valve body is not failed.
In another technical scheme, the preset distance I is 5.6mm, the preset distance II is 5.5mm, and the threshold is 0.12V. The three values are better experience values obtained after the test of a large number of motors and valve body bodies, and are beneficial to more accurately and more quickly positioning to the full-off position. The threshold value of 0.12V is the best value which is suitable for the motors and the valve bodies in most of the scenes after a large number of tests are carried out, so that the threshold value of 0.12V can be applied to the combination of the motors and the valve bodies in most of the models in the scenes.
In another technical solution, the steps in claim 1 are repeated N times, and the nth full off-point position is taken as a final full off-point position, where N is an integer greater than or equal to 10. The method avoids inaccurate locking of the full-off point position caused by external interference for a single time or a few times, and can judge the position point by repeated trial and error for many times so as to improve the accurate reliability of the full-off point position.
In another technical scheme, a terminal threshold value is set, if a voltage value greater than or equal to the threshold value is not monitored in the valve closing process, the motor continues to drive the push rod to push out according to a preset distance II, the valve closing is stopped until the monitored voltage value is greater than or equal to the terminal threshold value, the position of the push rod is the position of the full-close point and is stored, and the terminal threshold value is greater than or equal to the threshold value.
In the technical scheme, another method for judging the position of the full off-point is provided, and double insurance is provided for the detection of the position of the full off-point. If the position of the full-off point cannot be successfully locked in advance according to the threshold, the motor continues to drive the push rod to push out according to the stroke of the preset distance II, in the process, the motor can generate a 'slipping' phenomenon due to pushing without moving, the position at the moment is the position of the full-off point of the valve body, and the 'slipping' phenomenon is generated along with sudden increase of a voltage value corresponding to a phase current pulse loaded on the motor and is close to a short-circuit phenomenon, so that the position point can be easily judged, and double guarantee is provided for judging the position of the full-off point by combining the previous threshold trial judgment and the 'short-circuit' judgment in the scheme.
The temperature control method of the ERV automatic temperature control valve comprises the following steps: and adjusting the distance for the motor to drive the push rod to retract from the fully-closed position to the valve opening direction, calculating the inflow of hot water in unit time, and adjusting the ambient temperature to a preset target temperature.
In the technical scheme, the opening degree of the valve body can be accurately measured and calculated based on the locking point of the full-off position of the valve body, so that the temperature can be accurately adjusted by adjusting the distance for the motor to drive the push rod to retract from the full-off position to the valve opening direction. The battery energy consumption is effectively controlled. In an electronic actuator powered by a dry battery, a driving motor executes opening, closing and opening adjustment of a valve body, and is most power-consuming.
There is provided an ERV automatic temperature control valve comprising:
the valve body is provided with a push rod, the push rod is connected with a motor, and the motor drives the push rod to retract and push out so as to control the opening and closing of the valve body;
the MCU is connected with the motor, a preset distance I, a preset distance II and a threshold value are stored in the MCU, the MCU controls the motor to drive the push rod to retract to the valve opening direction by the preset distance I, then controls the motor to drive the push rod to gradually push out towards the valve closing direction, the MCU judges that when the monitored voltage value corresponding to the phase pulse current loaded on the motor is larger than or equal to the threshold value, the motor is controlled to stop, the position of the push rod at the moment is recorded, namely the position of the full-closing point, and the maximum distance pushed out towards the valve closing direction by the push rod is the preset distance II;
and the voltage monitoring module is used for monitoring a voltage value corresponding to the phase pulse current loaded to the motor in the valve closing process.
In the technical scheme, the MCU can write the controlled software program in advance, and when the MCU is used, the MCU can control the software program according to the preset programs only by starting the software program. The whole ERV automatic temperature control valve is small in size, high in automation degree, accurate and reliable in full-off position detection and low in power consumption.
In another technical solution, the method further comprises:
a temperature sensor for detecting an ambient temperature;
a data input terminal for inputting a control target;
the MCU calculates the inflow amount of hot water required in unit time according to a control target and the ambient temperature, calculates the opening of the valve body, and controls the motor to drive the push rod to retract towards the valve opening direction or push the push rod towards the valve closing direction until the calculated opening of the valve body is matched.
In above-mentioned technical scheme, combine temperature sensor and data input to after being connected to the heating terminal with the automatic temperature-sensing valve of ERV, can adjust the temperature, data input can supply the user to input control objective, convenient and fast.
In another technical scheme, the data input end is a key and/or a mobile end which is in communication connection with the MCU through ZigBee. Adopt button and zigBee communication can promote user experience, can be with removing end APP control, can direct key control again.
In another technical scheme, the system further comprises a display screen for displaying the human-computer interaction information. It is helpful for the user to know the operation state of the current automatic thermostatic valve.
In another technical scheme, the automatic temperature control valve is powered by a battery. The battery is not limited by an environmental wire jack and can be freely installed, and 2 dry batteries can be used for more than half a year according to the current test data due to the power saving property of the circuit design, and the defect that the batteries need to be frequently replaced does not exist.
The automatic temperature-sensing valve of ERV is the product that this application independently researched and developed a section and be used in heating system end, simultaneously, still adopts the automatic temperature-sensing valve of battery powered. In fact, the ERV automatic temperature control valve is an integrated machine combining an electronic temperature controller and an electronic actuator (and is powered by a dry battery). The intelligent electronic temperature controller has the functions of an electronic temperature controller and an electronic actuator, is powered by a dry battery, has the function of ZigBee wireless networking communication, and can be remotely controlled by a mobile phone App.
In the prior art, an electronic temperature controller and an electronic actuator are 2 different products. Are typically implemented separately. Electronic temperature controller: the system is provided with a temperature sensor, a key, an LED display, an MCU (micro controller unit) and the like. The 'environment temperature' can be monitored, a user can set a 'target temperature', a 'working mode' and the like according to own needs through key operation and LED display; generally, "input" of the "electronic thermostat" is "key operation" and "ZigBee communication command information" and data obtained by monitoring "ambient temperature" through the "temperature sensor". Generally, the output of the electronic thermostat is a relay which is switched on or off, or a 0-10V analog output signal; the output of the electronic temperature controller is just the input of the electronic actuator;
an electronic actuator: it is composed of DC motor or step motor, heating valve body connector (mechanical assembly), MCU (micro control unit)
Controller), etc.; the control intention of an electronic temperature controller can be executed, and the on-off control or the opening degree regulation of the valve can be implemented; generally, the "input" of the "electronic actuator" is just the control signal given by the "electronic thermostat";
in the ERV automatic temperature control valve, after 2 types of products, namely an electronic temperature controller and an electronic actuator, are combined into a whole, the same MCU (micro control unit) is used, so that the functions of the electronic temperature controller and the electronic actuator are finished.
Meanwhile, the ERV automatic temperature control valve is a design product powered by dry batteries, namely, the aim of more than half a year for 2 dry batteries is designed, and power saving measures must be considered comprehensively. Therefore, a control algorithm idea of "controlling the temperature by opening degree adjustment" is selected as the "temperature control algorithm". Namely: the "hot water inflow amount per unit time (i.e., the heat energy input amount)" is controlled by adjusting the "opening degree" of the "hot water valve", thereby achieving the purpose of automatically adjusting and controlling the temperature of the indoor environment (heating).
By adopting the control algorithm of controlling the temperature by opening degree adjustment, the accumulated time and frequency of the adjustment action of the valve body (hot water valve) by the driving motor can be reduced to the maximum extent. The battery energy consumption is effectively controlled. In the 'electronic actuator' powered by a dry battery, the driving motor is most power-consuming to open, close and adjust the opening of the valve body. But the biggest disadvantage of adopting the temperature control algorithm is that the realization difficulty is large.
To realize the temperature control algorithm of 'controlling temperature by opening degree adjustment', the positioning problem of the full close point of the valve body of the (hot water valve) must be solved firstly. Without accurate positioning of the full close point of the valve body, the opening regulation control algorithm cannot be realized.
In order to reduce the cost and adapt to the miniaturization of products, a circuit does not use a position sensor in the aspect of circuit design, and therefore under the condition, the software control implementation of intelligent positioning of the valve body under the condition without the position sensor is researched.
When the ERV automatic temperature control valve is powered on and started every time (after system initialization), under software control (preset program, controlled by MCU), firstly, a valve body intelligent positioning process is executed once to determine the position of a valve body full-close point. The intelligent positioning process of the valve body is specifically as follows:
A. firstly, the motor-driven push rod is retracted by about 5.6mm towards the valve opening direction (i.e. inwards) under the control of software (i.e. the push rod is retracted to the bottommost position);
the push rod stroke with a certain length is retracted towards the valve opening direction (inwards), so that engineering installation is facilitated; considering that the positions of the full-close points of the valve bodies are different for the valve bodies with different sizes, therefore, the push rod is retracted to the bottommost part to try to probe the positions of the full-close points in the next flow in the whole process to prepare;
B. after 5.6mm past the retrieval push rod in A above, the motor push rod has reached (or approached) the bottommost position. At the moment, the software controls and starts the motor, and the push rod is slowly stepped to the valve closing direction (namely, outwards) to be pushed out by a stroke about 5.5mm at the expected maximum;
in the process of pushing out the voltage data to the valve closing direction (outward) (about 5.5mm is expected), the control software continuously monitors the voltage data loaded on the phase A of the motor at the same time so as to judge the detected signal of the full closing point in advance according to the threshold value and reduce energy consumption;
if the full-off-point position cannot be successfully locked in advance according to the threshold, the motor is continuously driven according to the preset 5.5mm stroke, and the process of probing the full-off-point position in the whole process is executed; in the process, after the motor is controlled by software and drives the valve push rod to push and press the valve body to the full-close position, the motor cannot be pushed to cause the phenomenon of 'slipping', and the position at the moment is the valve body 'full-close position'.
The accurate positioning of the valve 'full-close point' is realized, and is a precondition for 'linear control of the valve opening'. The accurate positioning of the valve body under the condition without a position sensor is realized on the ERV automatic temperature control valve by the software control means.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
- The method for positioning the full-off position of the ERV automatic temperature control valve is characterized by comprising the following steps of:and controlling a motor to drive a push rod to retract a preset distance I in a valve opening direction, then controlling the motor to drive the push rod to gradually push out a preset distance II in a valve closing direction, monitoring a voltage value corresponding to a phase pulse current loaded on the motor in a valve closing process, stopping closing the valve when the voltage value is greater than or equal to a threshold value, and storing the position of the push rod, namely the position of a full-close point.
- 2. The method as claimed in claim 1, wherein said predetermined distance i is 5.6mm, said predetermined distance ii is 5.5mm, and said threshold value is 0.12V.
- 3. The method of claim 1 wherein the steps of claim 1 are repeated N times with the nth full-off position being the final full-off position, wherein N is an integer greater than or equal to 10.
- 4. The method for locating the fully-closed position of an ERV automatic temperature control valve as claimed in claim 1, wherein an end threshold is set, if a voltage value greater than or equal to the threshold is not monitored during the valve closing process, the motor continues to drive the push rod to push out according to a preset distance II, the valve closing is stopped until the monitored voltage value is greater than or equal to the end threshold, and the position of the push rod is the fully-closed position and is stored, wherein the end threshold is greater than or equal to the threshold.
- 5. The temperature control method of the ERV automatic temperature control valve based on the positioning method of any one of claims 1 to 4 is characterized by comprising the following steps: and adjusting the distance for the motor to drive the push rod to retract from the fully-closed position to the valve opening direction, calculating the inflow of hot water in unit time, and adjusting the ambient temperature to a preset target temperature.
- 6. The ERV automatic temperature control valve based on the temperature control method of claim 5, which is characterized by comprising the following steps:the valve body is provided with a push rod, the push rod is connected with a motor, and the motor drives the push rod to retract and push out so as to control the opening and closing of the valve body;the MCU is connected with the motor, a preset distance I, a preset distance II and a threshold value are stored in the MCU, the MCU controls the motor to drive the push rod to retract to the valve opening direction by the preset distance I, then controls the motor to drive the push rod to gradually push out towards the valve closing direction, the MCU judges that when the monitored voltage value corresponding to the phase pulse current loaded on the motor is larger than or equal to the threshold value, the motor is controlled to stop, the position of the push rod at the moment is recorded, namely the position of the full-closing point, and the maximum distance pushed out towards the valve closing direction by the push rod is the preset distance II;and the voltage monitoring module is used for monitoring a voltage value corresponding to the phase pulse current loaded to the motor in the valve closing process.
- 7. The ERV automatic temperature control valve of claim 6, further comprising:a temperature sensor for detecting an ambient temperature;a data input terminal for inputting a control target;the MCU calculates the inflow amount of hot water required in unit time according to a control target and the ambient temperature, calculates the opening of the valve body, and controls the motor to drive the push rod to retract towards the valve opening direction or push the push rod towards the valve closing direction until the calculated opening of the valve body is matched.
- 8. The ERV automatic temperature control valve of claim 6, wherein the data input end is a key and/or a mobile end connected with the MCU through ZigBee communication.
- 9. The ERV automatic temperature control valve of claim 6, further comprising a display screen for displaying human-computer interaction information.
- 10. The ERV automatic thermostat valve of claim 6 wherein said automatic thermostat valve is battery powered.
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