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7799results 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
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