A pulse shot-type flow rate control device including first and second shutoff valves, a tank, a pressure sensor, and a controller is caused to perform two or more processes. In each process, the controller repeats pulse shots of alternately causing the first shutoff valve and the second shutoff valve to open and close, changes a way of the pulse shots based on a pressure difference between the pressure after filling and the pressure after discharge, and controls a volume flow rate. In each process, the controller stores, as an optimal filling time, a filling time when the volume flow rate is controlled to a target flow rate, and opens and closes the first shutoff valve by using the optimal filling time in a first pulse shot in the next process.

A resin supply unit of a manufacturing apparatus supplies a resin to a roller surface of an impregnated roller which is capable of rotating at a constant speed. A transport mechanism brings the fiber bundle into contact with the resin on the roller surface and thereby forms a tow prepreg while the fiber bundle is being transported. A fineness acquisition unit acquires as a fineness acquisition value a fineness, which is defined by a mass per unit length of the fiber bundle during conveyance thereof before being brought into contact with the resin. A resin supply amount control unit controls the resin supply amount based on the fineness acquisition value, in a manner so that a resin content of the tow prepreg becomes a target resin content.

A liquid supply method for an atomizer and a liquid supply apparatus thereof, relating to the technical field of smoking simulation. The method includes : when a heating member generates heating, acquiring a resistance value of the heating member, (S110); obtaining a liquid supply rule according to the resistance value of the heating member, the liquid supply rule comprising at least one of a liquid supply speed for of using a pump to supply liquid to the atomizing chamber, and a liquid supply duration of using the pump to supply liquid to the atomizing chamber in a unit time period (S120); and controlling the pump to supply liquid to the atomizing chamber according to the liquid supply rule (S130). A problem of dry burning of an electronic cigarette can be solved, and effects of avoiding dry burning and liquid explodes and improving a smoking taste of electronic cigarettes are achieved.

A valve positioner for use on a process control valve or “valve assembly.” The process control valve may include a pneumatic actuator and a valve having a closure member coupled with the pneumatic actuator and moveable relative to a seat. The valve positioner may couple to the pneumatic actuator to provide a pneumatic signal to set a position of the closure member relative to the seat. An accelerometer may couple with the valve positioner. The accelerometer may generate data in response to orientation of the valve positioner. In one implementation, the configurations can use this data to ensure proper visualization of data on a display. The data also permits the device to properly manage operating modes, like tight shut-off or fully-opened mode, that may prevail due to orientation issues that cause defects in a measured position for a closure member that regulates flow of material through the valve assembly.

A flow rate control apparatus with improved reliability is provided. The flow rate control apparatus comprises a flow rate measuring unit for measuring a flow rate of chemical solution in a chemical solution supply line, a flow rate control unit for comparing a preset target flow rate profile and an applied flow rate profile, and controlling the flow rate of the chemical solution so that the applied flow rate profile matches the target flow rate profile, and a processor for switching the flow rate control unit to a first mode in response to a signal for the flow rate of the chemical solution measured by the flow rate measuring unit being less than a preset level, wherein, in the first mode, the applied flow rate profile includes a profile of a flow rate estimation model simulated using a flow rate of chemical solution measured by the flow rate measuring unit.

Upstream process equipment transmits a predetermined fluid to downstream process equipment. A valve fluidly couples the upstream process equipment to the downstream process equipment. A first pressure sensor and a first temperature sensor are coupled to the upstream process equipment and upstream from the valve. A second pressure sensor and a second temperature sensor are coupled to the downstream process equipment and downstream from the valve. A control system is coupled to the first pressure sensor, the first temperature sensor, the second pressure sensor, and the second temperature sensor. The control system determines a first fluid flowrate of the predetermined fluid using a fluid flow model based on pressure data from the first pressure sensor and the second pressure sensor, temperature data from the first temperature sensor and the second temperature sensor, a size of the valve, at least one fluid parameter regarding the predetermined fluid, and a valve flow coefficient of the valve.

A method for actuating a valve with an electromagnetic valve drive through which electric current is conducted to open or close the valve or to hold the valve in an open or closed position includes receiving an opening signal, determining an adapted opening signal which is adapted to physical limits of the valve or valve drive, and determining a feed-forward signal for feed-forward control of an electric current to drive the electromagnetic valve drive to open the valve in reaction to the adapted opening signal. The method further includes calculating an actuation signal for actuating the valve drive using the feed-forward signal, and outputting the actuation signal.

An automated method of pipeline sensor integration for product mapping of a pipeline network is provided. The method includes acquiring, by a plurality of sensors of the pipeline network, first sensor responses of a pipeline in the pipeline network when a first hydrocarbon product is flowing through the pipeline. The method further includes using a prediction circuit to receive the acquired first sensor responses, integrate the received first sensor responses into one or more integrated first sensor responses in order to improve accuracy of the received first sensor responses, and identify the first hydrocarbon product in the pipeline based on the integrated first sensor responses. The prediction circuit is built from training data using a machine learning process. The training data includes first training sensor responses of the pipeline by the plurality of sensors acquired at a previous time when the first hydrocarbon product was flowing through the pipeline.

Systems and methods for optimizing the application of pulse width modulation (PWM) in a voltage signal for delivering a current in a valve used to alternatively deliver pressurized gas to and vent from chambers in a vitrectomy probe used to drive a cutter.

A flow control module with a thermal mass flow meter is provided. The thermal mass flow meter facilitates measuring both a flow rate and a temperature of a fluid passing through the flow control module. Fluids may experience different flow characteristics at different temperature ranges. The flow control module includes a proportional control valve for selectively adjusting the flow rate of the fluid passing through the flow control module. Upon detecting that the temperature of the fluid is outside of a temperature range for the fluid, a controller is configured to load a different set of calibration parameters for controlling the operation of the proportional control valve to accommodate the different flow characteristics of the fluid at that temperature. Additionally, the controller is configured to detect bubbles using the thermal mass flow meter based upon the difference in thermal conductivity of gasses and liquids.