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4353results about "Simultaneous control of multiple variables" patented technology

Direct drive fan system with variable process control

The present invention is directed to a direct-drive fan system and a variable process control system for efficiently managing the operation of fans in a cooling system such a as wet-cooling tower or air-cooled heat exchanger (ACHE), HVAC systems, mechanical towers or chiller systems. The present invention is based on the integration of key features and characteristics such as tower thermal performance, fan speed and airflow, motor torque, fan pitch, fan speed, fan aerodynamic properties, and pump flow. The variable process control system processes feedback signals from multiple locations in order control a high torque, variable speed, permanent magnet motor to drive the fan. Such feedback signals represent certain operating conditions including motor temperature, basin temperature, vibrations, and pump flow rates. Other data processed by the variable process control system in order to control the motor include turbine back pressure set-point, condenser temperature set-point and plant part-load setting. The variable process control system processes this data and the aforesaid feedback signals to optimize the operation of the cooling system in order to prevent disruption of the industrial process and prevent equipment (turbine) failure or trip. The variable process control system alerts the operators for the need to conduct maintenance actions to remedy deficient operating conditions such as condenser fouling. The variable process control system increases cooling for cracking crude and also adjusts the motor RPM, and hence the fan RPM, accordingly during plant part-load conditions in order to save energy.
Owner:PRIME DATUM

Space environmental temperature and humidity control method and control device thereby

InactiveCN101737897ANo frequent movementsNo dehumidification occursMechanical apparatusSpace heating and ventilation safety systemsTemperature controlControl system
The invention discloses a space environmental temperature and humidity control method and a control device thereby. In the method, a controller controls the operation of an actuating mechanism used for adjusting temperature and humidity according to temperature and humidity monitoring results so as to control the temperature and humidity of air; according to the required temperature and relative humidity of a target space, a set air dew-point temperature value of a mixed air section is set in advance in a storage; the controller compares a monitored air dew-point temperature monitored value of the mixed air section, which is monitored by a dew-point temperature sensor, with the set air dew-point temperature value of the mixed air section, which is set in advance, and judges whether the actuating mechanism is used to cool the air to lower the humidity or not; and after the adjustment decision is made, a temperature control procedure starts. Since the monitoring adjustment decision making step of the air dew-point temperature value of the mixed air section is repeated according to a set cycle in the running process of an air conditioning unit, the method can carry out necessary control of lowering humidity, raising or reducing temperature as required. The invention not only can greatly save energy, but also can stabilize a control system and realize high-accuracy control by using the control system, the temperature control and the humidity control of which are not interfered.
Owner:黄逸林

Miniature closed type intelligent adjustment system of plant cultivation environmental factors

The invention discloses a miniature closed type intelligent adjustment system of plant cultivation environmental factors which comprises a cultivation box body and intelligent control structures. A plurality of interlayers used for plant cultivation are arrange inside the cultivation box body. The intelligent control structures comprise a human-computer interface, an industrial control board and collection executing mechanisms. Users send operational orders to the industrial control board through the human-computer interface. The collection executing mechanisms comprise a collection mechanism and an executing mechanism. The collection mechanism comprises a temperature sensor, a humidity sensor, a carbon dioxide (CO2) concentration sensor and an illumination sensor. The executing mechanism comprises a compressor, a heater, a fan, a supplementary lighting device, a CO2 producer and a nutrient solution automatic cycle replenishing device. An output end of the collection mechanism is connected with an input end of the industrial control board, and an output end of the industrial control board is respectively connected with the human-computer interface and the executing mechanism. The miniature closed type intelligent adjustment system of plant cultivation environmental factors integrates automatic supplementary lighting function, temperature and humidity automatic adjustment function and CO2 concentration and nutrient solution automatic cycle replenishing function through automatic control and sensor technology, and a need of household vegetable cultivation can be met.
Owner:JIANGSU POLYTECHNIC COLLEGE OF AGRI & FORESTRY

Automatic control system for intelligent and efficient greenhouse agricultural production

The invention relates to an automatic control system for intelligent and efficient greenhouse agricultural production, which comprises a central processing module, and a detection module, a keyboard input module, a display module, a communication module and an execution module which are connected with the central processing module, wherein the detection model comprises a temperature sensor, a humidity sensor, an illumination sensor, a carbon dioxide concentration sensor, an oxygen concentration sensor and a settling pond water yield sensor, which are arranged in a shed, and a wind speed sensor, a rain and snow sensor, a shed-outside temperature sensor and a shed-outside humidity sensor, which are arranged outside the shed; the execution module comprises a cooling unit, a warming unit, a ventilating unit, a light filling unit and a deep-well pump; and the communication module is connected with an upper computer away from the shed by a communication cable. By the automatic control system, the growth environment in the shed can be detected in real time, moisture, other nutrients and the growth environment required by plants are supplied and controlled intelligently, so that animals and the plants can grow quickly with high efficiency and nutrition in ideal environment, the labor cost is reduced, and the output efficiency is improved.
Owner:宁波金太阳光伏科技有限公司

Data fusion system and method of differential GPS (Global Position System) and inertial navigation in intelligent vehicle

The invention relates to a data fusion system and method of a differential GPS and an inertial navigation in an intelligent vehicle. The data fusion method of the differential GPS and the inertial navigation in the intelligent vehicle includes utilizing the differential GPS arranged at the top of the vehicle to obtain information provided by a space satellite and utilizing an upper computer which is to perform data fusion to extract GPS data according to the NEMA-0183 protocol to obtain information such as heading, speed and position; utilizing an inertial navigation system arranged in the middle of the inside of the vehicle body to collect data of a heading changing rate and x-axis and y-axis accelerations during vehicle operating, and transmitting the data to the upper computer which is to perform data fusion to obtain a heading angle and the speed and the displacement of the x-axis and the y-axis; and through algorithm integration, finally obtaining accurate navigational positioning information and utilizing the inertial system to provide RI (Related Information) under the condition that the GPS signals are lost. Besides, the method further includes displaying the navigational positioning data in a map and transmitting the packed data to a planning decision-making upper computer through an LAN (Local Area Network) created through a router, and controlling the intelligent vehicle according to analyzed information and actual travelling conditions.
Owner:BEIJING UNIV OF TECH

Humiture automatic control device and method

The invention discloses a device which can automatically control temperature and humidity, as well as the method thereof. The device of the invention comprises an air conditioner, a damping machine, a dehumidifying machine, a ventilation system, a constant temperature lamp, a constant humidity lamp, a display and a printer, as well as a central control system which is connected with the air conditioner, the damping machine, the dehumidifying machine, the ventilation system, the constant temperature lamp, the constant humidity lamp, the display and the printer. The method of the invention comprises the following steps: the indoor temperature and the indoor humidity which need to be controlled are determined and the maximum and the minimum of the temperature and the maximum and the minimum of the humidity are set according to the needs, and the indoor and the outdoor temperature and the indoor and the outdoor humidity are measured; whether the ventilation system, the air conditioner, the damping machine and the dehumidifying starts or set under the constant temperature or constant humidity state is judged according to the indoor temperature and the indoor humidity which need to be controlled as well as the difference between the maximum and the minimum of the temperature and the maximum and the minimum of the humidity which are set and the indoor and the outdoor temperature and the indoor and the outdoor humidity; the ventilation system, the air conditioner, the damping machine and the dehumidifying are started or set under the constant temperature or constant humidity state according to the judgment of the result.
Owner:袁宣贵

Temperature/humidity controller for use in an air conditioner and a recording medium storing temperature/humidity control programs used therefor

In a main controller for use in an air conditioner for controlling temperature/humidity of an intaken outside air, a controlling line setter (18) sets each of control lines (J1-J5) on a psychrometric chart table (13), in which an aimed temperature/humidity line (Lo) is formed by connecting an upper limit state point (Ps) and a lower limit state point (Pw) of condition air from each of the outside air state points (G1-G5) to the aimed temperature/humidity line (Lo). The controlling line (J1-J5) is formed by connecting necessary lines selected from a main heating line (HL) showing the heating operation of a main heater (H), an adiabatic humidifying line (WL) showing the humidifying operation of an adiabatic humidifying device (W), a cooling line (CL) showing the cooling operation of a cooler (C) and an auxiliary heating line (RHL) showing the heating operation of the auxiliary heater (RH), and the end point temperature for each of the lines is set as the aimed exit temperature for each of the temperature/humidity adjusters (4, 4) and each of the temperature/humidity adjusters (4-4) is individually put to feedback control. Temperature/humidity control can be conducted accurately and at a good response, and energy can be saved and the running cost can be reduced.
Owner:TRINITY IND CORP

Fuzzy control system and method of throttle mechanism

The invention discloses a fuzzy control system and a method of a throttle mechanism. According to the invention, a refrigeration cycle system comprises a compressor, a condenser and an evaporator. The control method comprises the following steps: monitoring the refrigerant vaporization temperature and water supply fluid temperature of the evaporator, and defining the small temperature difference of the evaporator as the temperature difference of subtracting the refrigerant vaporization temperature from the water supply fluid temperature; monitoring the temperature and the saturation temperature of the refrigerant discharged by the condenser, and defining the condenser depression of the refrigerant discharged by the condenser as the difference of subtracting the refrigerant temperature from the refrigerant saturation temperature; and calculating the opening of the throttling orifice of an electronic expansion valve by utilizing the small temperature difference of the evaporator and the condenser depression of the refrigerant discharged by the condenser. The method and the device of the invention can solve the problem of failure to realize stable and precise regulation on the opening of the electronic expansion valve due to the unstable liquid level signals of the evaporator in the prior art.
Owner:YORK WUXI AIR CONDITIONING & REFRIGERATION CO LTD +1

Multifunctional gas sensor testing system

The invention discloses a multifunctional gas sensor testing system. The multifunctional gas sensor testing system comprises a gas distribution mechanism and a gas distribution chamber, a testing chamber, a control system, a testing mechanism and a vacuum pump, wherein the gas distribution mechanism is used for preparing standard-concentration gas and background gas for the gas distribution chamber; prepared standard-concentration testing gas is stored in the testing chamber and the testing chamber is used for testing a sensor sensitive property under standard concentration of gas to be tested; and the control system is used for controlling gas preparation in the gas distribution chamber and the testing chamber, and comprises temperature and humidity control, gas pressure or vacuum degree control, gas mass and flow control, on-off control of each gas-path solenoid valve, starting/stopping control of the vacuum pump, starting/stopping control of a stirring fan, and testing process control of a detected sensor. According to the multifunctional gas sensor testing system disclosed by the invention, rapid contact of the sensor and standard gas is realized by automatically preparing the standard-concentration gas, and the temperature and humidity of a sensor testing environment also can be controlled; and synchronous testing of electric gas responding of the plurality of sensors and optical gas responding of the single sensor also can be realized.
Owner:HUBEI UNIV

Intelligent measurement and control system of greenhouse based on internet of things

InactiveCN102789222AReflect real-time statusScientific planting decision-making basisTotal factory controlSimultaneous control of multiple variablesEngineeringCrop production
The invention relates to an intelligent measurement and control system of a greenhouse based on internet of things, comprising at least one set of monitoring modules and a central control system. The monitoring modules are connected with the central control system, and the central control system is connected with a user terminal through a remote interactive module. Each monitoring module comprises an environment induction module and an environment control module, wherein the environment induction module comprises a temperature and humidity sensor, a light sensor and a pyroelectric infrared sensor, and the environment control module comprises a heater, a humidifier, a fan and respective execution unit. The intelligent measurement and control system also comprises a camera which is connected with a gateway. Compared with the prior art, the intelligent measurement and control system of the greenhouse has the advantages that automatic information detection and control are realized in the greenhouse, the image monitoring of the production environment and real-time acquisition of growth images of plant leaves and the like are realized by utilizing the video network technology, the real-time state of the crop production is intuitively reflected, and more scientific cultivating decision accordance can be provided for farmers comprehensively.
Owner:SUZHOU CHIEN SHIUNG INST OF TECH

Green storage and transportation and cold-chain logistics monitoring system and method based on BeiDou system

ActiveCN103135640ARealize the function of intelligent controlRealize the warning effectLogisticsSimultaneous control of multiple variablesGeneral Packet Radio ServiceMicrocontroller
The invention provides a green storage and transportation and cold-chain logistics monitoring system based on the BeiDou system. The green storage and transportation and cold-chain logistics monitoring system based on the BeiDou system comprises an environment parameter monitoring device, a remote monitoring management system and a remote inquiring platform, and is characterized in that the environment parameter monitoring device comprises a BeiDou locating module, a temperature sensor, a humidity sensor, a pressure sensor and a weight sensor, the BeiDou locating module, the temperature sensor, the humidity sensor, the pressure sensor and the weight sensor are connected with a microcontroller, and an output end of the microcontroller is connected with an alarm circuit, a compressor control circuit, a pressure supply control circuit, a transmission control protocol (TCP)/internet protocol (IP) network module and a general packet radio service (GPRS) module. A control method for the environment parameter monitoring device comprises the steps of (a) collecting environment information, (b) uploading the information, (c) judging weight, (d) judging whether temperature reaches an alarm value, and (e) judging whether the temperature reaches an automatic cooling value. According to the green storage and transportation and cold-chain logistics monitoring system and the method based on the BeiDou system, the fact that agricultural products, aquatic products, foods and drinks are located in an optimum freshness retaining state in the process of freshness retaining, transportation and storage is ensured, original corruption and spoilage are prevented, and safety of stored and transported objects is ensured.
Owner:SHANDONG COMP SCI CENTNAT SUPERCOMP CENT IN JINAN
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