CN1277162C - Method and device of heat exchange system intelligent monitoring - Google Patents
Method and device of heat exchange system intelligent monitoring Download PDFInfo
- Publication number
- CN1277162C CN1277162C CN 01139173 CN01139173A CN1277162C CN 1277162 C CN1277162 C CN 1277162C CN 01139173 CN01139173 CN 01139173 CN 01139173 A CN01139173 A CN 01139173A CN 1277162 C CN1277162 C CN 1277162C
- Authority
- CN
- China
- Prior art keywords
- radiator fan
- heat
- exchange system
- heat exchange
- monitoring unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Feedback Control In General (AREA)
- Control Of Temperature (AREA)
Abstract
The present invention relates to a method and an apparatus for intelligently monitoring heat exchange systems. A heat exchange monitoring unit in a machine case heat exchange system collects the temperature value of the heat exchange system, calculates the collected temperature then, and controls the rotary speed of a radiator fan according to calculation results and a fuzzy control table finally. The apparatus comprises the heat exchange monitoring unit, the radiator fan and a temperature sensor, wherein the signal input terminal of the heat exchange monitoring unit is connected with the temperature sensor, and receives the temperature measurement signals of the temperature sensor. The control output terminal of the heat exchange monitoring unit is connected with the radiator fan, and outputs control signals used for controlling the rotary speed of the radiator fan. The present invention overcomes the disadvantage that temperature monitoring and heat radiation when the radiator fan runs are respectively independent and can be organically combined, reduces noise and power consumption, enhances product reliability and the service life of the radiator fan, and has the characteristics of high intelligence, strong adaptability and simple adjustment.
Description
Technical field:
The present invention relates to a kind of method and apparatus of heat exchange system intelligent monitoring, be meant especially a kind of can be according to the rotating speed of the environment temperature of reality and heat radiation situation control radiator fan, make that exhaust air rate obtains adjusting in its cabinet; Simultaneously, reduce the noise of radiator fan, save the energy; Belong to control or regulation technology field.
Background technology:
Thermal value in the communication facilities frame is big, if can not in time the heat dissipation in the frame be gone out, the heat of accumulation will cause each device, device in the equipment can't operate as normal because of continuous intensification; Serious also can cause device fails or damage.For guaranteeing the operate as normal of equipment, just must adopt the means of heat interchange, just utilize fan, as early as possible heat is exhaled by the air channel.
Existing communication equipment heat-exchange system mainly adopts following several method to dispel the heat and monitors:
First method: utilize DC fan simply,, the heat that produces in the equipment is distributed by the air channel.Fan is with running at full capacity in this method, and its exhaust air rate is fixed and can not be adjusted; Simultaneously, the noise that fan produces is bigger, wastes energy, and its life-span also can be subjected to certain influence.If the surplus of thermal design is limited, then if there is a fan to damage, the heat in the entire equipment can't effectively shed, and be unfavorable for the operate as normal of communication facilities.
Second method: utilize existing built-in temperature-controlled fan, promptly the temperature sensor that carries with fan is controlled the rotating speed of fan.But this method will be transported to the producer that produces temperature-controlled fan to relevant device, and then, the thermal environment of analog machine work is tested again, obtains the corresponding relation of temperature variation and rotation speed of the fan, by producer the rotating speed of fan is demarcated again.Will cause the equipment prolongation of hot system development cycle artificially like this, cost increases; If equipment inner structure or circuit need change later on, then also need the hot system of equipment after the change is gone to demarcate once more; Therefore, the very flexible of this method needs a large amount of fund inputs.In addition, existing built-in temperature-controlled fan does not have the device of data output, so the temperature value that temperature sensor can't be measured sends out.
The third method: outside fan and control circuit thereof, the external temperature sensor, rely on this temperature sensor monitors to the facility environment variation of temperature, and adjust the parameter of correspondent peripheral circuit, and then realize regulating the adjusting of fan exhaust amount according to the result of monitoring.But, if this temperature sensor damages, will cause the out of control of rotation speed of the fan, heat-exchange system also just can't operate as normal.
Summary of the invention:
Fundamental purpose of the present invention is to provide a kind of method and apparatus of heat exchange system intelligent monitoring, and it can make its exhaust air rate obtain adjusting according to the environment temperature of reality and the rotating speed of heat radiation situation control radiator fan; Simultaneously, reduce the noise of radiator fan, saving wastes energy, and improves the life-span of radiator fan, helps the operate as normal of equipment, makes existing communication facilities more perfect, reliable to the monitoring of heat-exchange system, realizes the Intellectualized monitoring of heat-exchange system.
Another purpose of the present invention is to provide a kind of method and apparatus of heat exchange system intelligent monitoring, it has the function and the data input/output interface of fuzzy control, the temperature value that temperature sensor can be measured sends out, and be arranged on easily with various equipment with cooling system in, the dirigibility of the hot system development of equipment is strong, cycle is short, and cost is low.
A further object of the present invention is to provide a kind of method and apparatus of heat exchange system intelligent monitoring, it is when controlling and regulating radiator fan, also the duty to temperature sensor monitors, no matter whether temperature sensor damages, the rotating speed that can both guarantee radiator fan can be not out of control, and heat-exchange system still can be worked effectively.
The objective of the invention is to realize by the following technical solutions:
A kind of method of heat exchange system intelligent monitoring, the heat interchange monitoring unit in the cabinet heat-exchange system is gathered the temperature value of heat-exchange system; Then the temperature of being gathered is calculated last rotating speed according to result of calculation and fuzzy control table control radiator fan.
Above-mentioned heat interchange monitoring unit is also gathered the rotating speed state of radiator fan, and controls according to this rotating speed state.
Above-mentioned heat interchange monitoring unit is communicated by letter with the external control device by data-interface, and controls the rotating speed of radiator fan according to the order of external control device.
The heat interchange monitoring unit is by the temperature value of connected temperature sensor measurement heat-exchange system, and determines the authenticity of this temperature value by cyclic redundancy check (CRC) (Cyclic Redundancy Check is called for short CRC) signal; When the CRC check made mistakes, heat interchange monitoring unit control radiator fan was with a constant rotary speed working.
The heat interchange monitoring unit receives the tach signal of fan, then the expectation value of this tach signal with control output is compared, and according to comparative result the rotating speed of radiator fan is regulated again.
Calculating recited above comprises: calculate the changing value of deviation between actual temperature value and the preferred temperature value, this deviation and fuzzy control rule is carried out the form mathematics manipulation, obtain to be used for determining that control variable PWM exports the fuzzy control table of the heat interchange monitoring unit fuzzy controller of number percent.
Described external control device is a computing machine.
Described radiator fan or temperature sensor are one or more.
The control signal of heat interchange monitoring unit output is a pwm signal.
A kind of device of heat exchange system intelligent monitoring which comprises at least heat interchange monitoring unit, radiator fan, temperature sensor; The signal input part of heat interchange monitoring unit is connected with temperature sensor, and it receives the temperature measurement signal of temperature sensor; The control output end of heat interchange monitoring unit is connected with radiator fan, and its output is used to control the control signal of radiating fan rotation speed.
The heat interchange monitoring unit also has the input end of the tach signal that is used to receive radiator fan output, and it is connected to the tachometer signal end of radiator fan.
The device of heat exchange system intelligent monitoring also comprises the external control device, and this device is connected by data-interface with the heat interchange monitoring unit; The heat interchange monitoring unit sends to outside control device by data-interface and detects data, and receives the control command of external control device.
Described radiator fan or temperature sensor are one or more.
The control signal of heat interchange monitoring unit output is a pwm signal.
External control device recited above is a computing machine, and data-interface is the RS232 serial ports.
Adopt the method for the invention and device, compared with prior art, it is independent separately that it has overcome in the prior art temperature monitoring and fan running heat radiation, the shortcoming that can not organically combine, and noise-decreasing and power consumption increase product reliability and fan life to greatest extent.Fuzzy logic control algorithm is adopted in the temperature control of this device fan, has high-intelligentization, and adaptability is strong, transfers and surveys simply.Device of the present invention has been realized the intellectuality control of heat-exchange system rotation speed of the fan, and has measuring ability, makes the heat-exchange system stable and reliable operation of communication facilities.
The present invention can make its exhaust air rate obtain adjusting according to the environment temperature of reality and the rotating speed of heat radiation situation control radiator fan; Simultaneously, reduced the noise of radiator fan, saved the energy, improved the life-span of radiator fan, helped the operate as normal of equipment, made existing communication facilities more perfect, reliable, realized the Intellectualized monitoring of heat-exchange system the monitoring of heat-exchange system.
The function of the fuzzy control that the present invention has and data input/output interface, the temperature value that temperature sensor can be measured is sent to the external control device, and can be arranged on easily with various equipment with cooling system in; Therefore, the dirigibility of the hot system development of equipment is strong, and the cycle is short, and cost is low.
The present invention is when controlling and regulating radiator fan, and also the duty to temperature sensor monitors, no matter whether temperature sensor damages, and can both guarantee that the rotating speed of radiator fan can be not out of control, and heat-exchange system still can be worked effectively.
That the present invention is described in further detail is as follows below in conjunction with drawings and Examples:
Description of drawings:
Fig. 1 is a heat-exchange system supervising device theory diagram of the present invention.
Fig. 2 is a control flow chart of the present invention.
Fig. 3 is the fuzzy logic controller structural representation of one embodiment of the invention.
Fig. 4 is the heat interchange supervising device fuzzy control table of one embodiment of the invention.
Embodiment:
Heat interchange supervising device of the present invention is realized following function: 1) collecting temperature value; 2) temperature value is calculated, regulate the rotating speed of fan; 3) the rotating speed state of collection fan; 4) communicate by letter with the external control device by serial ports, report current temperature value and rotation speed of the fan, and can be according to the order of external control device, the rotating speed of control fan.
The described heat interchange supervising device of one embodiment of the invention is by forming with the lower part: heat interchange monitoring unit, fan, temperature sensor, external control device.The heat interchange monitoring unit receives the temperature value that temperature sensor is sent here, and the control rotation speed of the fan receives the tach signal that fan is exported.The heat interchange monitoring unit is connected by serial ports with the external control device.
The treatment step of the heat interchange method for supervising of present embodiment is as follows:
The first step: form the fuzzy rule of heat interchange supervising device, promptly make fuzzy control rule, and they are carried out the form mathematics manipulation, constitute the control table of supervising device fuzzy controller according to expert's control knowledge and experience.
Second step: the heat interchange monitoring unit receives the temperature value that temperature sensor is sent here, calculate the deviation of actual temperature value and preferred temperature value, also draw the variation of temperature deviation simultaneously, control the rotating speed of fan according to the fuzzy control table output pwm signal that draws above.
The 3rd step: utilize CRC check, whether the monitor temperature sensing is in operate as normal.
The 4th step: receive the tach signal of fan, compare, judge that whether fan is in operate as normal with the rotating speed of the pairing expectation fan of output pwm signal.
The 5th step: with the communication of external control device, report the duty of current temperature value, rotation speed of the fan value, temperature sensor and fan, control the rotating speed of fan at any time according to the order of external control device.
Referring to Fig. 1, in the heat-exchange system supervising device, digital temperature sensor is by the CPU communication on data port line and the heat interchange monitoring unit; Digital temperature sensor gives the CRC check signal except sending temperature value; Whether therefore, utilize this CRC check signal to be easy to just can to judge the duty of temperature sensor normal.The rotating speed of heat interchange monitoring unit output pwm signal control radiator fan also receives the tach signal that radiator fan is exported simultaneously.Because the supply voltage of radiator fan is higher, can utilize photoelectric coupled device to carry out electrical isolation.During actual the use, two radiator fans can be set, it is worked simultaneously, when wherein a radiator fan breaks down, the operate as normal that can come the maintaining heat exchange system by the rotating speed of the radiator fan that improves operate as normal.
The external control device can be a common computer, also can be higher level's control module, and it is connected and communication by standard RS232 serial ports with the heat interchange monitoring unit; The heat interchange monitoring unit is detected temperature value, and the rotating speed of radiator fan, various alarm status are uploaded to the external control device in real time, and the order according to the external control device simultaneously enters the survey state of transferring, according to the rotating speed of external command control radiator fan.
Referring to Fig. 2, the step of the method for supervising of present embodiment is described in detail as follows:
When device of the present invention is started working, at first, the CPU initialization of heat interchange monitoring unit, the hardware circuit self check, if self check is wrong, heat interchange monitoring unit control radiator fan moves with a constant rotational speed, reports the error message of the corresponding hardware of external control device simultaneously.
After the hardware circuit self check was normal, the heat interchange monitoring unit began to detect the current standard state that is in and still transfers the survey state; This transfers the survey state to be set by the external control device, is standard state when default.When transferring the survey state, monitoring unit only reports the external control device with the rotating speed of detected temperature value and radiator fan, according to the rotating speed of the instruction control radiator fan of external control device.Because the actual digital temperature sensor that uses, monitoring unit is also determined the authenticity of temperature value by the CRC check signal when receiving sensor is sent temperature value here, if CRC check is made mistakes, then report the error message of temperature sensor to outside control device.
If the heat interchange monitoring unit is in standard state, then this heat interchange monitoring unit is according to the rotating speed of the temperature value output pwm signal control radiator fan that collects.For degree is differentiated in the intellectuality that improves the heat interchange supervisory system, when the control radiating fan rotation speed, use a kind of fuzzy logic control algorithm, control the rotating speed of radiator fan according to the control table of the fuzzy controller that draws.This algorithm is set an expectation temperature earlier, calculates deviation with the preferred temperature value according to the detected temperatures value then, and according to the trend and time of temperature variation, the variation of calculating this temperature value deviation; With the variation of the deviation of temperature and the deviation input as fuzzy controller, and pwm signal is as the rotating speed of output control radiator fan.Make mistakes if temperature sensor detects the CRC check of temperature value, the heat interchange monitoring unit will be controlled radiator fan and move with a constant rotational speed, report the error message of temperature sensor simultaneously to outside control device.
The heat interchange monitoring unit compares by pwm signal and the detected radiating fan rotation speed value with output, judge whether the radiator fan operation is normal, when if the error that exists between the pairing expectation tachometer value of pwm control signal of the rotating speed of radiator fan and monitoring unit output surpasses a preset threshold, report the warning information of this radiator fan to outside control device.
As shown in Figure 3, be the structure of fuzzy logic controller.In manual control procedure, the information that relies on artificial intuition to obtain is essentially two: the deviation of (1) temperature; (2) variation of temperature deviation; In general, the people is the most responsive to temperature deviation, secondly is the variation of temperature deviation.Because fuzzy control rules is according to manually control law design, so input variable of fuzzy controller also can be two, that is: the variation of temperature deviation and temperature deviation; Output variable is the variation of exporting to the pwm signal of radiator fan.
To carry out fuzzy control to system, need decide how system is adjusted control according to the rate of change of difference between actual temperature and the preferred temperature and difference thereof; Because these input values are all more accurate, therefore, at first to convert them to the subordinate function of fuzzy set.For ease of Project Realization, usually artificial discrete some levels, the resolution that how much depends on required input of the progression that defines of being defined as of the scope of input variable.The subordinate function of definition input quantity is bell shaped function, trapezoidal function or triangular function.Adopt triangular function in the present embodiment.
Referring to Fig. 3, according to above-mentioned fuzzy control rule, if desired temperatures value T is 40 ℃, the domain that the heat-exchange system of equipment can be determined by experiment the difference E between actual temperature and the expectation value is [20,20], the domain of the rate of change EC of temperature deviation is [100,100], the domain of control variable PWM output number percent U is [20,100], the quantification gradation of getting three linguistic variables all is 9 grades, that is:
E，EC，U＝{-4，-3，-2，-1，0，1，2，3，4}
E wherein, EC, each scale factor of U is:
k1＝4/20＝1/5；k2＝4/100＝1/25；k3＝8/80＝1/10；
As shown in Figure 4, it is the control table of fuzzy controller, carry out the form mathematics manipulation and constitute this control table by experienced operator or expert's control knowledge and experience being made fuzzy control rule, this control table is as the fuzzy control rule of heat interchange supervising device of the present invention.Consider special circumstances, when the detected temperature value of heat-exchange device during greater than 60 ℃, control variable PWM output number percent U is 100, and when the detected temperature value of heat-exchange device during less than 20 ℃, control variable PWM output number percent U is 0.Because the foundation of fuzzy control table is that off-line carries out, therefore do not influence the speed of fuzzy controller real time execution.In case fuzzy control table is set up, the algorithm of fuzzy logic inference device is exactly simple look-up table.
Above embodiment is only unrestricted in order to explanation the present invention, although the present invention is had been described in detail with reference to above preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment, be out of shape the present invention or be equal to replacement, and not breaking away from the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (12)
1, a kind of method of heat exchange system intelligent monitoring is characterized in that:
1) the heat interchange monitoring unit is gathered the temperature value of heat-exchange system, calculates the deviation of actual temperature value and preferred temperature value, and the variation of temperature deviation, controls the rotating speed of radiator fan again in conjunction with the heat-exchange system fuzzy control rule;
2) the heat interchange monitoring unit is gathered the actual speed of radiator fan, compares with the rotating speed of expecting radiator fan, judges that whether radiator fan is in operate as normal.
2, the method for heat exchange system intelligent monitoring according to claim 1, it is characterized in that: the heat interchange monitoring unit and is determined the authenticity of this temperature value by the temperature value of connected temperature sensor measurement heat-exchange system in the step 1) by CRC check signal; When the CRC check made mistakes, heat interchange monitoring unit control radiator fan was with a constant rotary speed working.
3, the method for heat exchange system intelligent monitoring according to claim 1, it is characterized in that: step 2) in the heat interchange monitoring unit receive the tach signal of fan, then the expectation value of this tach signal with control output compared, according to comparative result the rotating speed of radiator fan is regulated again.
4, the method for heat exchange system intelligent monitoring according to claim 1, it is characterized in that: calculate the changing value of deviation between actual temperature value and the preferred temperature value, this deviation in the step 1) and fuzzy control rule is carried out the form mathematics manipulation, acquisition is used for determining that control variable PWM exports the fuzzy control table of the heat interchange monitoring unit fuzzy controller of number percent, by the rotating speed of control variable PWM control fan.
5, according to the method for claim 1,2,3 or 4 described heat exchange system intelligent monitorings, it is characterized in that: described radiator fan is one or more.
6, the method for heat exchange system intelligent monitoring according to claim 2 is characterized in that: described temperature sensor is one or more.
7, a kind of device of heat exchange system intelligent monitoring is characterized in that: which comprises at least heat interchange monitoring unit, radiator fan, temperature sensor, external control device; The signal input part of heat interchange monitoring unit is connected with temperature sensor, and it receives the temperature measurement signal of temperature sensor; The control output end of heat interchange monitoring unit is connected with radiator fan, and its output is used to control the control signal of radiating fan rotation speed.The heat interchange monitoring unit also has the input end of the tach signal that is used to receive radiator fan output, and it is connected to the tachometer signal end of radiator fan.
The external control device is connected by data-interface with the heat interchange monitoring unit; The heat interchange monitoring unit sends to outside control device by data-interface and detects data, and receives the control command of external control device.
8, the method for heat exchange system intelligent monitoring according to claim 7 is characterized in that: described radiator fan is one or more.
9, the method for heat exchange system intelligent monitoring according to claim 7 is characterized in that: described temperature sensor is one or more.
10, the device of heat exchange system intelligent monitoring according to claim 7 is characterized in that: the control signal of heat interchange monitoring unit output is a pwm signal.
11, the device of heat exchange system intelligent monitoring according to claim 7 is characterized in that: described external control device is a computing machine.
12, the device of heat exchange system intelligent monitoring according to claim 7 is characterized in that: described data-interface is the RS232 serial ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01139173 CN1277162C (en) | 2001-12-19 | 2001-12-19 | Method and device of heat exchange system intelligent monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01139173 CN1277162C (en) | 2001-12-19 | 2001-12-19 | Method and device of heat exchange system intelligent monitoring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1427318A CN1427318A (en) | 2003-07-02 |
| CN1277162C true CN1277162C (en) | 2006-09-27 |
Family
ID=4675098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01139173 Expired - Lifetime CN1277162C (en) | 2001-12-19 | 2001-12-19 | Method and device of heat exchange system intelligent monitoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1277162C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410826C (en) * | 2004-10-09 | 2008-08-13 | 华为技术有限公司 | Control device and control method of rotation speed of temperature controlled fan |
| TWI468594B (en) | 2011-10-25 | 2015-01-11 | Ibm | Multi-pq fan control system and computer system having the same |
| TWI494748B (en) * | 2013-02-04 | 2015-08-01 | Quanta Comp Inc | Fan controlling method and notebook thereof |
| CN103593028A (en) * | 2013-11-01 | 2014-02-19 | 浪潮电子信息产业股份有限公司 | Design method for regulating and controlling environment temperature of server |
| CN106523412B (en) * | 2015-09-11 | 2018-07-03 | 上海电科电器科技有限公司 | The fan monitoring method and monitoring device of frame circuit breaker |
| CN106229003B (en) * | 2016-08-31 | 2018-09-18 | 浙江大华技术股份有限公司 | The method and device of radiating fan rotation speed in a kind of adjustment storage device |
| CN107807695A (en) * | 2017-12-12 | 2018-03-16 | 河南思维轨道交通技术研究院有限公司 | A kind of cooling system and method for supporting the autonomous temperature control regulation rotating speed of multi-fan |
| CN108151449A (en) * | 2018-01-10 | 2018-06-12 | 济南大学 | A kind of autocontrol method of microwave vacuum freeze drying device |
| CN111173765A (en) * | 2018-11-13 | 2020-05-19 | 技嘉科技股份有限公司 | Fan diagnostic circuit |
| CN109236705A (en) * | 2018-11-27 | 2019-01-18 | 英业达科技有限公司 | Fan rotational frequency control method and its device |
| CN112682341A (en) * | 2020-12-02 | 2021-04-20 | 安徽工程大学 | Electric fan rotating speed control method and electric fan |
| CN114228571A (en) * | 2021-12-30 | 2022-03-25 | 北汽瑞翔汽车有限公司 | Electric vehicle thermal management control method |
-
2001
- 2001-12-19 CN CN 01139173 patent/CN1277162C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1427318A (en) | 2003-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1277162C (en) | Method and device of heat exchange system intelligent monitoring | |
| CN100511071C (en) | Apparatus and method for rotation speed of temperature control fan | |
| CN101871465A (en) | Control device and method of cooling fan of ATCA (Advanced Telecom Computing Architecture) system | |
| CN1598428A (en) | Method for self-adaptive optimizing controlling cold water system of central air conditioner and its apparatus | |
| CN110778516A (en) | Fan speed regulation method and device of display screen controller and storage medium | |
| CN1687852A (en) | Digitalized control energy-saving method for central air conditioner | |
| CN102062460B (en) | Accurate air supply system of air conditioning unit and realizing method thereof | |
| CN117171590A (en) | Intelligent driving optimization method and system for motor | |
| CN101192065B (en) | Heat radiating fan control device and method | |
| CN100410826C (en) | Control device and control method of rotation speed of temperature controlled fan | |
| CN213298277U (en) | Intelligent control system of air compressor | |
| CN108730170A (en) | A kind of more motor Optimal Control Systems and its optimal control method | |
| CN1598426A (en) | Chilled water energy-saving apparatus of cental air conditioner | |
| CN114585247B (en) | AI analysis-based energy-saving control method for data machine room | |
| CN114513048A (en) | Intelligent well field skid-mounted electric control integrated device | |
| CN103629137B (en) | Noise reduction processing method for DCS cabinet | |
| CN211288189U (en) | Fan speed regulating device | |
| CN117419000A (en) | Group control system of fan group, intelligent adjusting method and control terminal thereof | |
| CN2375031Y (en) | Brushless fan rotary speed control circuit device | |
| CN2748675Y (en) | Fan rotary speed control system | |
| CN1295912A (en) | Injection machine energy-saving device and method based on frequency-converting speed regulator | |
| CN117596758B (en) | Fault diagnosis method and system for intelligent BA (building block) automatic control system of new energy factory | |
| CN1547122A (en) | Automatic control system based on computer hardware monitoring circuit | |
| CN117140772B (en) | Comprehensive control system of continuous low-temperature mixing internal mixer | |
| CN116241447A (en) | Novel energy-saving speed-regulating electric water supply pump system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHENG CITY ZTE CO., LTD. Free format text: FORMER OWNER: SHENZHENG CITY ZTE CO., LTD. SHANGHAI SECOND INSTITUTE Effective date: 20030723 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20030723 Applicant after: Zhongxing Communication Co., Ltd., Shenzhen City Applicant before: Shanghai Inst. of No.2, Zhongxing Communication Co., Ltd., Shenzhen City |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20060927 |
|
| CX01 | Expiry of patent term |