CN110953682A - Air conditioning system and time correction method of GPRS module thereof - Google Patents
Air conditioning system and time correction method of GPRS module thereof Download PDFInfo
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
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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
- F24F11/88—Electrical aspects, e.g. circuits
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F15/00—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity
- G07F15/001—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity for gas
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F15/00—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity
- G07F15/12—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity in which metering is on a time basis
Abstract
The invention discloses an air conditioning system and a time correction method of a GPRS module of the air conditioning system. The time correction method of the GPRS module of the air conditioning system comprises the following steps: the GPRS module is electrified to acquire external time and read time deviation; if the corresponding time deviation data does not exist, the GPRS module acquires the external time at every first interval; calculating and storing the time deviation of the GPRS module according to the currently acquired external time, the last acquired external time and the first time length, and calculating and correcting the current timing time and/or data storage time of the GPRS module according to the time deviation; and if the corresponding time deviation data exists, calculating and correcting the current timing time and/or data storage time of the GPRS module according to the external time and the time deviation. The invention can enable the GPRS module to acquire accurate timing time at the highest speed, thereby ensuring the timeliness and integrity of data acquisition.
Description
Technical Field
The invention relates to an air conditioning system, in particular to a time correction method for GPRS modules in outdoor units of the air conditioning system.
Background
At present, a GPRS module is installed in an external unit of a part of air-conditioning systems, the GPRS module collects unit operation data, firstly caches the unit data to a module storage area according to the current timing time of the GPRS module, and then regularly transmits the cached unit data and the collection time back to a server, so that the flow and the server access resources can be saved.
Limited by various factors such as cost and the like, the GPRS module is not in a power-on state all the time, but the data acquired by the GPRS module relate to acquisition time, and the time cannot run in a background after the GPRS module is powered off. Therefore, after the GPRS module is electrified, the GPRS module needs to be connected with the server first, after the connection is successful, the current time is obtained from the server, timing is carried out inside by taking the time as a starting point, and the current time and data are stored in the data storage area according to a certain rule.
However, there are many problems to be solved by the above prior art means, for example, there is a certain deviation in the internal timing of the GPRS module, for example, the time obtained after the GPRS is powered on is 2019, 12 and 9, 08: 00, after 1 hour, the current time of GPRS is 09:00 in 12 months and 9 days in 2019, but the server time at this time may be 08:54 in 12 months and 9 days in 2019. Therefore, the current timing time of the GPRS module has deviation, and the time needs to be corrected when data storage is carried out.
In addition, in the power-on process of the GPRS module, there is a possibility that a GPRS signal is not good or a network is not good, if the GPRS module is not connected to a server late, time recording during data storage is also affected, and a corresponding measure is not provided in the prior art for a while.
Disclosure of Invention
The invention provides an air conditioning system and a time correction method of a GPRS module thereof, aiming at solving the technical problem that the time of the GPRS module of the air conditioning system in the prior art is inaccurate.
The invention provides a time correction method of a GPRS module of an air conditioning system, which comprises the following steps:
the GPRS module is electrified to acquire external time and read time deviation;
if the corresponding time deviation data does not exist, the GPRS module acquires the external time at every first interval; calculating and storing the time deviation of the GPRS module according to the currently acquired external time, the last acquired external time and the first time length, and calculating and correcting the current timing time and/or data storage time of the GPRS module according to the time deviation;
and if the corresponding time deviation data exists, calculating and correcting the current timing time and/or data storage time of the GPRS module according to the external time and the time deviation.
Further, calculating the time deviation of the GPRS module according to the currently acquired external time, the last acquired external time, and the first time duration specifically includes:
calculating the current timing time of the GPRS module according to the last acquired external time and the first time length;
calculating a first difference value between the currently acquired external time and the current timing time of the GPRS module, and a second difference value between the currently acquired external time and the last acquired external time;
and dividing the first difference value by the second difference value to obtain the time deviation.
Further, the external time is server time, correction time of a household charging system of the air conditioning system, or external time forwarded by other GPRS modules in the air conditioning system.
Further, the GPRS module preferentially acquires the server time and the server time forwarded by other GPRS modules, and when the server time is continuously acquired and fails to reach the preset times, at least one GPRS module acquires the correction time of the household charging system and forwards the correction time to other GPRS modules.
Further, a plurality of GPRS modules of air conditioning system pass through bus connection, the GPRS module acquires external time and includes the step:
each GPRS module is connected with a server to acquire the time of the server and monitor the bus data;
when any one GPRS module successfully acquires the server time, forwarding the server time to other GPRS modules through a bus;
and each GPRS module is disconnected with the server.
Further, the step of acquiring the external time by the GPRS module specifically includes:
at least one GPRS module of the air conditioning system sends a time acquisition request to a household charging system of the air conditioning system;
after receiving the time acquisition request, the household charging system feeds back the time information of the latest at least 2 times of synchronous servers and the current timing time of the household charging system to the GPRS module which sends the request;
calculating the time deviation of the household charging system according to the time information of at least 2 times of synchronous servers, and correcting the current timing time of the household charging system according to the time deviation to obtain the correction time of the household charging system;
and forwarding the correction time of the individual charging system to other GPRS modules.
Further, the time information of the synchronization server includes the current server time and the current timing time of the household charging system corresponding to the server time.
Further, after the household charging system feeds back the time information of the last 2 times of synchronization servers and the current timing time of the household charging system to the corresponding GPRS module, the method specifically includes the following steps:
the corresponding GPRS module calculates the time deviation T of the household charging system according to the formula (T2-T1)/(T1-T3)Deviation of；
The corresponding GPRS module is specifically according to a formula T5- (T5-T1) × TDeviation ofCalculating the correction time of the individual charging system;
the T1 is the server time acquired by the household charging system for the nth time, the T2 is the current timing time of the household charging system corresponding to the server time acquired by the household charging system for the nth time, the T3 is the server time acquired by the household charging system for the (n-1) th time, and the T5 is the current timing time of the household charging system; n is a natural number greater than 1;
further, the first time length is obtained by timing by an internal timer of the processor of the GPRS module.
The air conditioning system provided by the invention comprises at least one outdoor unit, wherein each outdoor unit is internally provided with a GPRS module, and the GPRS module corrects the current timing time and/or data storage time of the GPRS module according to the time correction method in the technical scheme.
By the invention, the GPRS module with bad signals can also obtain accurate external time as the timing time in the shortest time. If the external time cannot be successfully acquired from the server, selecting an optimal GPRS module to obtain at least 2 groups of specific time data from the household charging system, and caching the time and the data after calculating to obtain relatively accurate time. Meanwhile, time is acquired from the server regularly, and is corrected, so that the timeliness of data acquisition and the integrity of analysis are guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
Fig. 1 shows a flow chart of a preferred embodiment of the present invention. The air conditioning system of the present invention has one or more outdoor units, each having a GPRS module. The air conditioning system is also provided with a household charging system, and a household charging gateway of the household charging system of the air conditioning system can periodically access the server and then store time information in the operation process of the air conditioning system, so that household charging can be realized.
When one or more outdoor units of the air conditioning system are powered on, the GPRS module of the outdoor unit in the powered-on state is powered on and started, at the moment, the GPRS module is firstly connected with the server so as to obtain accurate current timing time, which is the primary way for the GPRS module to obtain correct external time. When a plurality of GPRS modules are connected with a server, if one GPRS module is connected with the server first, the time of the server is obtained and is forwarded to other GPRS modules. For example, if the GPRS module 1 preferentially acquires the server time from the server, the GPRS module 1 sends the acquired server time to a bus shared by the air conditioning unit and the GPRS module, and notifies other GPRS modules that the time does not need to be acquired from the server. And other GPRS modules are connected with the server to acquire the server time, simultaneously, the bus shared by the air conditioning unit and the GPRS modules is monitored in real time, if the GPRS modules are detected to acquire the server time from the server and send the server time to the bus, the GPRS modules quit the server connection, the time is not acquired from the server, but the server time is directly acquired from the bus shared by the air conditioning unit and the GPRS modules, and therefore accurate external time is acquired.
The GPRS module will use the external time (e.g., server time) obtained for the first time as its current timing time, and then the GPRS module will obtain the external time every first time interval. Because due to the consideration of cost, the GPRS module does not have a high-precision clock module, but is timed by an internal timer of the MCU, and the error is large. Meanwhile, the GPRS module cannot be connected to a server or a gateway all the time to acquire time data, so that an internal timer is required to time and correct the working time of the GPRS module in real time, that is, the current time and/or data storage time of the GPRS module needs to be corrected.
The GPRS module calculates the current time deviation of the GPRS module according to the currently acquired external time, the last acquired external time and the first time length to obtain the time deviation generated by the GPRS module per second, and corrects the time of the GPRS module per second according to the time deviation. Once the time deviation of the GPRS module per second is obtained, the value is recorded in a memory chip of the GPRS module, and the GPRS module is not used for the first time and does not need to be compared to obtain the time deviation.
Specifically, the current timing time of the GPRS module is calculated according to the last acquired external time and the first time length, then a first difference value between the current acquired external time and the current timing time of the GPRS module is calculated, and a second difference value between the current acquired external time and the last acquired external time is calculated; and dividing the first difference value by the second difference value to obtain the current time deviation. For example, the GPRS module first obtains the external time (e.g., server time) as: t7= 2019.11.189: 02:00.00, the internal calculation of the GPRS module obtains the external time (e.g. server time) again after 300 seconds (i.e. T8= 2019.11.189: 07: 00.00) as T9= 2019.11.189: 07:04.00, and then the time offset of the GPRS module can be calculated as: t is tGPRS module deviation= T9-T8=4 seconds, i.e. the internal time of the GPRS module is 4 seconds slower than normal, and the required correction time per second is:tGPRS module deviationAnd = 4/(T9-T7) = 100% = -1.316%, and the GPRS module stores the time offset and corrects the subsequent operating time.
In the above technical solution in which the GPRS module connection server obtains the time of the server to obtain the current timing time and the time deviation, it may happen that all powered-on GPRS modules cannot obtain the time from the server for N times (preset times), and in order to prevent the server from being under too much pressure due to connection retries of too many GPRS modules, all GPRS modules will suspend connecting to the server and enter a standby scheme. And one optimal GPRS module acquires the correction time of the household charging system and forwards the correction time to other GPRS modules.
For example, a GPRS module with the best performance and the best signal sends a time acquisition request to a household charging system of the air conditioning system, and after receiving the time acquisition request, the household charging system feeds back the time information of the synchronization server for the last 2 times or more and the current timing time of the household charging system to the GPRS module sending the request; the time information of the synchronous server of the specific household charging system comprises the current server time and the current timing time of the household charging system corresponding to the server time. The GPRS module calculates the time deviation of the household charging system according to the time information of the synchronous server for 2 times or more than 2 times, corrects the current timing time of the household charging system according to the calculated time deviation, and obtains the correction time of the household charging system, which is another way for the GPRS module to obtain accurate external time.
Taking the time information of the 2-time synchronization server as an example, after receiving the time acquisition request of the GPRS module, the household charging system reads the time information of the latest 2-time synchronization server in the database and the timing time of the current household charging system, and returns the time information to the GPRS module according to an agreed format. The timing time of the individual charging gateway corresponding to each individual charging system also has a deviation (which may be fast or slow), but the time deviation of the individual charging gateway is relatively fixed. For this characteristic, the GPRS module can analyze and calculate the received data, for example, the returned 2 groups of data is the nth server time T1:2019.11.188: 04:00.00, and the timing time T2: 2019.11.188: 04:12.00 of the household charging gateway (note: the household charging gateway can be updated to the correct time in time after acquiring the correct server time); the server time T3: 2019.11.187: 01:00.00 of the n-1 th time, and the timing time T4: 2019.11.187: 01:05.00 of the household charging gateway at the moment; the current timing time T5: 2019.11.189: 02:00.00 of the individual charging system, the GPRS module calculates the time deviation T of the individual charging system firstlyDeviation of= (T2-T1)/(T1-T3). I.e., the time offset was about 12/[ (2019.11.18,8:04:00.00-2019.11.18,7:01:00.00) × 3600]100% ≈ 0.3175%, i.e. the per second household charging gateway time will be 0.3175% faster than the server time. The GPRS module is then specified according to the formula T5- (T5-T1) TDeviation ofThe correction time of the individual account charging system is calculated to obtain 2019.11.189: 01: 48.95. Then, the GPRS module takes the obtained time as correct external time, then buffers the current timing time and the unit data according to the external time, and simultaneously starts an internal timer to time.
Similarly, regardless of whether the external time comes from the server or the household charging system, the GPRS module which firstly obtains the accurate external time forwards the obtained external time to other GPRS modules through the bus.
According to the technical scheme, after the GPRS modules of the air conditioning system are powered on, correct external time can be obtained from the server, but time consumption for successful obtaining is greatly different. Therefore, the optimal GPRS module acquires the server time from the server in the shortest time, the acquired server time is sent to the bus at the moment, and other GPRS modules which do not acquire the time can synchronize the self timing time after detecting that the GPRS module has successfully acquired the server time from the bus. If all the modules can not successfully acquire the external time from the server, in order to prevent too many GPRS modules from simultaneously inquiring and causing too much server pressure, one optimal GPRS module is selected to be used by the household charging system to acquire the external time. Storing at least 2 groups of data in a database table of a household charging system: the method comprises the time of the server when the server time is synchronized for the nth time and the time data of the household charging gateway at the moment of successful synchronization, wherein n is a natural number which is larger than 1, such as the 1 st time and the 2 nd time. If the server is unstable, all GPRS modules can not obtain time within a limited time, namely, the individual charging system is accessed, the 2 groups of data and the current timing time of the individual charging gateway are obtained from the individual charging system, and the relatively accurate time is obtained through certain calculation. Meanwhile, the timing time of the GPRS module is corrected in real time. Through the scheme, the GPRS module can obtain accurate timing time cache data in the shortest time, and the problem that time and data cannot be stored correctly due to the fact that the GPRS module is poor in signal and the server is unstable and cannot obtain time from the server in time is solved.
The foregoing is merely a preferred embodiment of the invention. The invention is not to be considered as limited to the embodiments, but is to be understood as being covered by the appended claims, along with the full scope of equivalents to which such claims are entitled.
Claims (10)
1. A time correction method for a GPRS module of an air conditioning system is characterized by comprising the following steps:
the GPRS module is electrified to acquire external time and read time deviation;
if the corresponding time deviation data does not exist, the GPRS module acquires the external time at every first interval; calculating and storing the time deviation of the GPRS module according to the currently acquired external time, the last acquired external time and the first time length, and calculating and correcting the current timing time and/or data storage time of the GPRS module according to the time deviation;
and if the corresponding time deviation data exists, calculating and correcting the current timing time and/or data storage time of the GPRS module according to the external time and the time deviation.
2. The method according to claim 1, wherein calculating the time offset of the GPRS module according to the currently acquired outside time, the last acquired outside time, and the first time duration specifically comprises:
calculating the current timing time of the GPRS module according to the last acquired external time and the first time length;
calculating a first difference value between the currently acquired external time and the current timing time of the GPRS module, and a second difference value between the currently acquired external time and the last acquired external time;
and dividing the first difference value by the second difference value to obtain the time deviation.
3. The time correction method according to claim 1, wherein the external time is a server time, a correction time of a household charging system of the air conditioning system, or an external time forwarded by other GPRS modules in the air conditioning system.
4. The time correction method according to claim 3, wherein the GPRS module preferentially acquires the server time and the server time forwarded by other GPRS modules, and when the continuous acquisition of the server time fails to reach a preset number of times, at least one of the GPRS modules acquires the correction time of the subscriber-based charging system and forwards the correction time to other GPRS modules.
5. The time correction method according to claim 3, wherein a plurality of GPRS modules of the air conditioning system are connected by a bus, and the GPRS modules acquiring the external time comprises the steps of:
each GPRS module is connected with a server to acquire the time of the server and monitor the bus data;
when any one GPRS module successfully acquires the server time, forwarding the server time to other GPRS modules through a bus;
and each GPRS module is disconnected with the server.
6. The time correction method according to claim 3, wherein the step of acquiring the external time by the GPRS module specifically comprises the steps of:
at least one GPRS module of the air conditioning system sends a time acquisition request to a household charging system of the air conditioning system;
after receiving the time acquisition request, the household charging system feeds back the time information of the latest at least 2 times of synchronous servers and the current timing time of the household charging system to the GPRS module which sends the request;
calculating the time deviation of the household charging system according to the time information of at least 2 times of synchronous servers, and correcting the current timing time of the household charging system according to the time deviation to obtain the correction time of the household charging system;
and forwarding the correction time of the individual charging system to other GPRS modules.
7. The time correction method according to claim 6, wherein the time information of the synchronization server includes the current server time and the current time counted by the household charging system corresponding to the server time.
8. The time correction method according to claim 7, wherein after said subscriber-only charging system feeds back the time information of the latest 2 times synchronization server and the current timing time of said subscriber-only charging system to the corresponding GPRS module, the method specifically comprises the steps of:
the corresponding GPRS module calculates the time deviation T of the household charging system according to the formula (T2-T1)/(T1-T3)Deviation of；
The corresponding GPRS module is specifically according to a formula T5- (T5-T1) × TDeviation ofCalculating the correction time of the individual charging system;
the T1 is the server time acquired by the household charging system for the nth time, the T2 is the current timing time of the household charging system corresponding to the server time acquired by the household charging system for the nth time, the T3 is the server time acquired by the household charging system for the (n-1) th time, and the T5 is the current timing time of the household charging system; n is a natural number greater than 1.
9. The time correction method of claim 8, wherein said first time duration is clocked by a processor internal timer of said GPRS module.
10. An air conditioning system, comprising at least one outdoor unit, each outdoor unit being provided with a GPRS module, wherein the GPRS module corrects the current timing time and/or data storage time of the GPRS module according to the time correction method of any one of claims 1 to 9.
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| CN113805463A (en) * | 2021-09-08 | 2021-12-17 | 珠海格力电器股份有限公司 | Method for calibrating timing time of air conditioner |
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