27 results about "Pressure Rate" patented technology

The invention relates to the technical field of cooling water abnormity monitoring, in particular to a steel slag pressure hot stuffy rolling cooling water abnormity alarm system and method.Roll gap cooling water flow, injection temperature, hot stuffy tank pressure and bearing vibration data are collected, a dynamic mapping relation between position coordinates of a spraying opening and a water inlet valve is established, temperature and pressure time sequence offset is calculated, and the temperature and pressure time sequence offset is calculated; the temperature judgment boundary is corrected by combining the pressure bearing limit value of the sealing ring and the real-time flow, and an abnormal alarm is triggered according to the temperature over-limit frequency in the continuous time period. A multi-source analysis framework is constructed by integrating temperature, flow, pressure and vibration parameters, single-point monitoring limitation is eliminated, nonlinear influence of the flow on tank pressure is quantified by adopting a dynamic weight model, a self-adaptive temperature threshold value is generated in combination with a sealing pressure bearing limit, dynamic coupling of an alarm mechanism is realized, an abnormal scene is positioned based on time sequence analysis and coordinate mapping, and the accuracy of monitoring is improved. The sealing hidden danger is pre-judged through the thermal unbalance coefficient, and the pressure rate deviation is intercepted in real time.

A method includes opening a flow path from a gas stick through a variable orifice, a chamber, and an outlet isolation valve of the chamber. The method further includes causing a gas to flow through the flow path at a flow rate setpoint. The method further includes actuating an opening of the variable orifice to establish a choked pressure regime within the chamber, the choked pressure regime being achieved by causing a first pressure upstream of the variable orifice to be at least two times a second pressure downstream of the variable orifice. The method further includes closing the outlet isolation valve to cause the chamber to be filled with the gas from the gas stick. The method further includes measuring a pressure rate-of-rise within the chamber. The method further includes determining one or more flow measurements based at least in part on the pressure rate-of-rise.

A method, device, and system for evaluating a vessel of a patient, and in particular the hemodynamic impact of a stenosis within the vessel of a patient. Proximal and distal pressure measurements are made using first and second instrument while the first instrument is moved longitudinally through the vessel from a first position to a second position and the second instrument remains in a fixed longitudinal position within the vessel. A series of pressure ratio values are calculated, and a pressure ratio curve is generated. One or more stepped change in the pressure ratio curve are then identified and / or located using an Automatic Step Detection (ASD) process and / or algorithm. The ASD includes identifying a general position of a starting point of the stepped change by identifying a change in the pressure ratio values within a first window along the pressure ratio curve that is at or above a first threshold change value, and identifying an optimized position of the starting point by identifying a change in the pressure ratio values within a second window along the pressure ratio curve that is at or above a second threshold change value, wherein the second window is smaller than the first window, and the second threshold change value is smaller than the first threshold change value.

A fuel cell system includes a system intake unit, a system exhaust unit, a fuel cell stack, an atmospheric pressure sensor, an air compressor, an airflow meter, a pressure sensor, and a control device, and prior to power generation, the air compressor is operated in a state in which an intake pipe and an exhaust pipe are connected, an exhaust pipe pressure loss map and an intake pipe pressure loss map are generated, and in power generation, an exhaust pipe pressure loss and an intake pipe pressure loss are determined by referring to the exhaust pipe pressure loss map and the intake pipe pressure loss map based on a target value of a stack flow rate, and the air compressor is controlled by a determined rotational speed for realizing the target value at the pressure ratio of the inlet pressure and the outlet pressure.

The present application aims to establish an efficient and stable cooling cycle. A cooling system for a moving body includes a compressor, a condenser, an expansion valve, an evaporator, a flow rate adjustment device that adjusts a flow rate of a cooling fluid that is guided to the condenser depending on an external environment of the moving body, an ambient temperature acquisition sensor that detects an ambient condition for acquiring an ambient temperature to which the condenser is exposed by the cooling fluid, a pressure sensor that detects a pressure of refrigerant in the condenser, a temperature sensor that detects a temperature of the refrigerant on a downstream side of the condenser, and a control unit that executes a first process of adjusting the flow rate of the cooling fluid so that the pressure of the refrigerant in the condenser is greater than a saturation pressure of the refrigerant at the ambient temperature based on an output of the ambient temperature acquisition sensor and the pressure sensor, and a second process of adjusting an opening degree of the expansion valve so that the refrigerant on the downstream side of the condenser is in a supercooled state based on an output of the pressure sensor and an output of the temperature sensor.

The present application relates to the field of air compressors, and more particularly to a variable frequency control method, system, and logic controller for air compressors. The variable frequency control method for air compressors includes presetting an air compressor outlet pressure P0 and a first pressure P1 of the air compressor when the air compressor is in a stopped state; obtaining a second pressure P2 at the air compressor outlet detected by a pressure transmitter within a preset time range, wherein the second pressure P2 is the maximum pressure value within the preset time range; obtaining a pressure comparison result based on the outlet pressure P0, the first pressure P1, and the second pressure P2, and adjusting the operating frequency of the air compressor based on the pressure comparison result. The present application has the effect of making the operating state of the air compressor system more stable during operation, thereby reducing frequent speed adjustments of the equipment and increasing the service life of the equipment.

The invention relates to the field of oil and gas production engineering, in particular to a jet pump process parameter design method considering gas and liquid phases and related products. Calculating the suction pressure of the jet pump; the minimum cavitation area of the jet pump is calculated, and multiple nozzle-throat combinations of the jet pump are determined; determining the power hydraulic pressure; calculating the flow of the power liquid, and determining the discharge pressure; calculating a dimensionless mass flow ratio; calculating a dimensionless pressure ratio; iterative calculation is carried out, and an optimal combination is obtained through screening from various nozzle-throat combinations; determining process parameters of the jet pump; determining ground pump parameters based on the process parameters of the jet pump; according to the method, the optimal operation parameters of the jet pump are determined by calculating the flow characteristics of the gas-liquid mixed fluid in the well, the accuracy of pump parameter design when the jet pump lifts the gas phase and the liquid phase can be improved, and the negative influence of the gas phase proportion on the operation performance of the pump is reduced by introducing correction calculation of the dimensionless pressure ratio and the dimensionless mass flow ratio.

Method for determining a diffusion coefficient of a diffusion of a first gas (79) through a porous material (2) into a second gas (80) at a gas pressure increased by at least 900% compared to atmospheric pressure, - wherein a sample (1) of the porous material (2) is arranged as a partition of defined thickness between a first gas space (58) and a second gas space (59), wherein the first gas space (58) is at least 5 times the size of an open pore volume of the sample (1), - wherein the first gas space (58), the open pore volume of the sample (1) and the second gas space (59) are purged with the first gas (79), - wherein the purging with the first gas (79) is completed and the first gas space (58) adjacent to the sample (1) is sealed off, - wherein the second gas (80), which is distinguishable from the first gas (79), is subsequently introduced into the second gas space (59) with a defined volume flow rate, and a gas mixture (81) comprising the second gas (80) and components of the first gas (79) is discharged from the second gas space (59), - wherein the diverted gas mixture (81) is maintained at the increased gas pressure and - wherein a concentration profile of the proportion of the first gas (79) in the gas mixture (81) derived from the second gas space (59) is recorded and analyzed with respect to the diffusion coefficient.

A reticle load lock with a variable size orifice valve or with a servo valve control is described. The servo valve control can continuously adjust the size of the orifice so that the reticle load lock can be pumped or vented at an optimal level. The servo valve control pressure curve follows an optimized pressure rate to protect the integrity of the pellicle structure. The optimized servo valve control curve minimizes the pump down and vent time without exceeding the pressure rate (dP / dt) limit. By following the optimized pressure rate curve, the servo valve control significantly reduces the time to pump down and vent and prevents the pellicle from rupturing.

The utility model provides a micro-flow three-gas mixing control structure which is quick and stable in response, and belongs to the technical field of gas flow control. The micro-flow three-gas mixing control structure rapid and stable in response comprises a high-pressure stabilizing valve body assembly and a gas converging assembly. The first gas valve terminal assembly comprises a first gas valve terminal valve body, an electromagnetic valve and a high-precision gas resistor, the gas outlet end of the first gas valve terminal valve body is connected with the gas inlet end of the electromagnetic valve, the gas outlet end of the electromagnetic valve is connected with the gas inlet end of the high-precision gas resistor, and the gas inlet end of the first gas valve terminal valve body is communicated with a proportional valve; the pressure of the high-pressure gas is reduced to a proper pressure through the pressure reducing valve, the proportional valve plays a role in stabilizing the pressure of the gas flow, and then the flow is controlled by permutation and combination of different high-precision gas resistors, so that the flow is accurately controlled from small to large. Stable and accurate control of micro flow and rapid response of micro flow change are achieved.

A sprayer control system includes a plurality of smart nozzles each having at least one control valve with a valve operator, an electronic control unit for the valve operator, and one or more spray nozzles. The at least one control valve and the ECU control a flow rate of liquid agricultural product through the nozzles. A duty cycle modulator is in communication with the ECU and generates an applied duty cycle for the at least one control valve. The duty cycle modulator includes a specified duty cycle input having a specified duty cycle and a pressure monitor associated with the at least one control valve. A pressure comparator compares the valve pressure determined with the pressure monitor with a system pressure and generates a pressure error. An applied duty cycle generator generates the applied duty cycle based on the specified duty cycle modified by the pressure error.

The invention relates to a method for monitoring cardiac cycle synchronized extracorporeal circulation support and to a corresponding device and circulation support device, in particular for optimizing the provided support pulses. Accordingly, a method for monitoring cardiac cycle synchronized extracorporeal circulation support (12) of a patient is described, comprising the steps of: receiving a pressure value characterizing an aortic pressure of the supported patient; determining a first minimum pressure value (40) of the cardiac cycle of the patient and a first point in time of the minimum pressure value (40) from the pressure values; determining, from the pressure value, whether there is a reduced rate of change of pressure at a subsequent second point in time (42), the reduced rate of change of pressure lying between an immediately preceding greater rate of change of pressure and a subsequent greater rate of change of pressure; and outputting a signal as a function of the reduced rate of pressure change (42) present. The pressure value is received by a pressure sensor (32) arranged upstream of an arterial cannula (30) of an extracorporeal circulation support (12) and downstream of an oxygenator (28).

The invention relates to the technical field of thermal power generating units, in particular to an intelligent cruising method and system for the pressure change rate of a thermal power generating unit. The method comprises the following steps: acquiring key parameters of thermal power generating unit operation in real time; the sliding pressure rate is adjusted in a staged mode, and control logic is set; according to the key parameters and the control logic, the sliding pressure rate is adjusted, closed-loop dynamic adjustment is formed, the sliding pressure rate can be automatically adjusted, closed-loop dynamic adjustment of the sliding pressure rate is achieved, unit parameter fluctuation is reduced, stable operation of a unit is guaranteed, and meanwhile the operation amount of operators is reduced.

Method for controlling a fuel cell (100) of a vehicle, comprising: Determine by means of a control whether pressure regulation is required to exert pressure on air being discharged from an air supply device (200), based on whether additional power output from the fuel cell (100) is required or whether the fuel cell (100) is in a drying-out state; In response to the determination that pressure control is required, deriving an opening degree of a valve on one side of an air outlet of the fuel cell (100) required for pressure control, by controlling and adjusting the valve based on the derived opening degree of the valve; Calculating a pressure ratio by the controller, which is obtained by calculating the following: (current degree of opening - first degree of opening) / (second degree of opening - first degree of opening), wherein the current degree of opening is a valve opening degree at the present time, the first degree of opening is an opening degree required when an air pressure is atmospheric pressure, and the second degree of opening is an opening degree at a time when the pressure regulation is complete; and Increasing a target hydrogen pressure based on an increase in the calculated pressure ratio or an increase in the flow rate of the air discharged from the air supply device (200).

This invention relates to a method for regulating the boost pressure of a power machine, wherein the power machine has a boosting device with a compressor and a compressor bypass, wherein the compressor bypass has a propulsion recirculation air valve for opening and closing the compressor bypass, wherein the boost pressure regulation uses the actual boost pressure and the rated boost pressure as input parameters, wherein a first compressor pressure ratio is determined based on a limit line from the compressor characteristic curve and the engine absorption line of the power machine, and a second compressor pressure ratio is determined based on a limit line from the compressor characteristic curve, the mass flow rate through the power machine, and a throttling characteristic line for the propulsion recirculation air valve, wherein a maximum permissible compression ratio for the compressor is determined from the first and second compressor pressure ratios, wherein a maximum permissible boost pressure is determined based on the maximum permissible compression ratio, and wherein the boost pressure regulation is limited to this maximum permissible boost pressure.

The invention discloses an unmanned aerial vehicle flight control brake instruction control method, and belongs to the technical field of aircraft brake control. Firstly, a step instruction is applied in the initial stage of braking, the current pressure efficiency is observed through the wheel speed variation, and the braking capacity is quantified; secondly, the pressurization rate is determined according to the pressure efficiency, a brake instruction is continuously increased, the speed reduction rate change rate is monitored, when the speed reduction rate change rate approaches zero, it is judged that the moment balance state is reached, and the speed reduction rate at the moment is determined as the target speed reduction rate; and finally, dynamically adjusting a brake instruction by taking the target deceleration rate as a reference to realize state tracking. According to the invention, closed-loop control of target deceleration rate detection and target deceleration rate tracking is realized only by depending on the wheel speed signal, the braking efficiency is effectively improved, overshoot is inhibited, and the method has the advantages of simple engineering realization, strong adaptability and good robustness.

The present invention relates to a hydrogen regulator, comprising: an upper chamber (50) in which a constant internal pressure is generated by compressed air; a lower chamber (60) connected to the upper chamber (50) through an orifice structure, in which a relief valve is configured in an intermediate region between the upper chamber (50) and the lower chamber (60) connected by the orifice structure so that the internal pressures of the two chambers are maintained at a constant pressure ratio, thereby providing a constant buffering force proportional to the pressure of a low-pressure output unit (30) during a vertical movement of a pressure control spring (40) for pressure control, thereby enabling a stable constant pressure output even under rapid pressure fluctuations and ensuring that the pressure inside the upper chamber (50) is maintained constant. Accordingly, the present invention has the effect that, when pressure is controlled by the hydrogen regulator, the output pressure of a fluid can be maintained constant even when abrupt pressure changes occur.

The present disclosure pertains to a system configured to protect flows in piping systems using minimal spare components. Some embodiments may provide: a first piping subsystem configured to receive a portion of the input flow; a second piping subsystem configured to receive the portion of the input flow by substituting for the first subsystem; a test subsystem configured to detect whether each of the first and second subsystems is able to vent when at least one, in the each subsystem, of a respective pressure and a respective pressure rate satisfies first and second criteria, respectively; and first and second pilots configured to detect a maximum pressure and a maximum pressure rate, respectively, of the portion of the first and second subsystems.

The invention discloses a method and device for adjusting the main steam pressure of a thermal power generating unit. The method comprises the steps that a target pressure value and a target main steam design temperature value corresponding to a target thermal power generating unit are determined according to a current load corresponding to the target thermal power generating unit; acquiring a current actual main steam temperature value and a current pressure value corresponding to the target thermal power generating unit; determining a sliding pressure rate correction coefficient according to the target main steam design temperature value and the current actual main steam temperature value, and correcting the preset sliding pressure rate according to the sliding pressure rate correction coefficient to obtain a corrected sliding pressure rate; and main steam pressure corresponding to the target thermal power generating unit is adjusted according to the corrected sliding pressure rate, the target pressure value and the current pressure value.

A method includes opening a flow path from a gas stick through a variable orifice, a chamber, and an outlet isolation valve of the chamber. The method further includes causing a gas to flow through the flow path at a flow rate setpoint. The method further includes actuating an opening of the variable orifice to establish a choked pressure regime within the chamber, the choked pressure regime being achieved by causing a first pressure upstream of the variable orifice to be at least two times a second pressure downstream of the variable orifice. The method further includes closing the outlet isolation valve to cause the chamber to be filled with the gas from the gas stick. The method further includes measuring a pressure rate-of-rise within the chamber. The method further includes determining one or more flow measurements based at least in part on the pressure rate-of-rise.

A sprayer control system includes a plurality of smart nozzles each having at least one control valve with a valve operator, an electronic control unit for the valve operator, and one or more spray nozzles. The at least one control valve and the ECU control a flow rate of liquid agricultural product through the nozzles. A duty cycle modulator is in communication with the ECU and generates an applied duty cycle for the at least one control valve. The duty cycle modulator includes a specified duty cycle input having a specified duty cycle and a pressure monitor associated with the at least one control valve. A pressure comparator compares the valve pressure determined with the pressure monitor with a system pressure and generates a pressure error. An applied duty cycle generator generates the applied duty cycle based on the specified duty cycle modified by the pressure error.

Method (200) for controlling an actuating force (F_act) provided by means of a pneumatic actuating device (120), wherein the actuating device (120) comprises a cylinder (125) and a piston (130) displaceably closing the cylinder (125), wherein a mass flow of air at a predetermined pressure into the cylinder (125) can be controlled by means of a valve (155), and wherein the method (200) comprises the following steps: sensing (205) a position (150) of the piston (130) in the cylinder (125); determining (235) a mass flow of air into the cylinder (125); determining (210) a pneumatic pressure in the cylinder (125) based on the mass flow and the position (150); determining (220) an actuating force (F_act) provided at the piston (130) based on the pressure and an effective piston area;and control (225) of the actuation of the valve (155) depending on the provided actuation force (F_act) and a desired actuation force (F_soll), ; wherein the mass flow rate is determined by means of a characteristic map (300) based on the actuation of the valve (155) and a pressure ratio that exists between the pressure of a compressed air source (170) connected to the valve (155) and a pressure in the cylinder (125) and wherein two characteristic maps (300) are specified which correspond to different wear states of the valve (155), and interpolation is performed between mass flow values ​​of both characteristic maps (300) depending on the operating time of the valve (155).

A compensation for the lag error in a measurement (QFlowmeter), by a flow meter, of the flow rate of a gaseous fuel in a turbomachine pipe is proposed. The flow meter has a transfer function (H(p)). A flow rate measurement (Qm) derived from a pressure ratio of the pressures across the terminals of the metering member is obtained by measuring the pressures upstream and downstream of the metering member, and then by applying the Barré Saint Venant relationship to the pressures. A dynamic measurement error (ΔQm) of the flow meter is calculated using the transfer function and this flow rate measurement (Qm) derived from the pressure ratio. The dynamic error is then added to the flow rate measurement from the flow meter to obtain a corrected measurement (QFlowCorr).

A method, device, and system for evaluating a vessel of a patient, and in particular the hemodynamic impact of a stenosis within the vessel of a patient. Proximal and distal pressure measurements are made using first and second instrument while the first instrument is moved longitudinally through the vessel from a first position to a second position and the second instrument remains in a fixed longitudinal position within the vessel. A series of pressure ratio values are calculated, and a pressure ratio curve is generated. One or more stepped change in the pressure ratio curve are then identified and / or located using an Automatic Step Detection (ASD) process and / or algorithm. The ASD includes identifying a general position of a starting point of the stepped change by identifying a change in the pressure ratio values within a first window along the pressure ratio curve that is at or above a first threshold change value, and identifying an optimized position of the starting point by identifying a change in the pressure ratio values within a second window along the pressure ratio curve that is at or above a second threshold change value, wherein the second window is smaller than the first window, and the second threshold change value is smaller than the first threshold change value.

This invention relates to the field of tire technology, and more particularly to a graded adaptive tire inner support device based on pressure change rate triggering, comprising: a wheel hub, with a plurality of inner support bodies arranged in a circumferential array on the outer circumference of the wheel hub and located in the inner cavity of the tire; each inner support body includes: a base, a radial center support assembly, and a scissor support assembly, the base being fixedly installed on one side of the outer circumferential surface of the wheel hub, the radial center support assembly being installed at the end of the base away from the wheel hub, and two sets of scissor support assemblies being arranged between the radial center support assembly and the base. When the tire slowly leaks air, the two sets of scissor support assemblies in each inner support body slowly unfold and approach the radial inner wall of the tire as the tire pressure changes; when the tire experiences a momentary blowout, the two sets of scissor support assemblies in each inner support body rapidly and fully unfold and rigidly press against the radial inner wall of the tire. This invention provides an adaptive tire inner support device that can improve driving safety.

The invention relates to a piston compressor (1) having a through chamber (11) connected to a compression chamber (5) via an overflow opening (12), a through valve (13) for opening and closing the overflow opening (12) and a through valve control unit (14) for controlling the through valve (13), which enables precise and fast capacity regulation even at large stroke volumes, according to the invention the through valve (13) is configured as an automatic ring valve, which automatically opens and closes the overflow opening (12) depending on the pressure ratio between the pressure in the through chamber (11) and the pressure in the compression chamber (5), wherein the through valve (13) is automatically opened when the pressure in the through chamber (11) is greater than the pressure in the compression chamber (5), a lifting gripper (15) is provided, which can be actuated by an electrically controllable actuator (17) in order to keep the through valve (13) in the open state independently of the pressure ratio, and the actuator (17) can be actuated by the through valve control unit (14) for the actuation.

The invention relates to a road engineering material performance evaluation technology, and discloses a comprehensive analysis method and system for asphalt adhesive force detection data, and the method comprises the steps: firstly obtaining the pressure process data of the whole pneumatic drawing process, dividing an elastic section and a damaged section based on a normalized load, and respectively extracting the pressure rise rate attribute of each section; then, a pneumatic piston operation state model is constructed, the air supply flow velocity influence is eliminated through the pressure increasing rate attribute, and a response coefficient representing the cavity volume change sensitivity is obtained through decoupling; further, based on a thin film mechanics principle, utilizing the difference between response coefficients of a high-pressure section and a low-pressure section to inversely calculate a stripping width geometric quantity of an interface edge; meanwhile, generating an equipment operation stability index by counting regression deviation; and finally fusing the failure pressure, the stripping width and the stability index to output a comprehensive quality judgment result. According to the method, the early annular damage of the interface and the instrument gas circuit fault can be effectively distinguished, and the accuracy and reliability of asphalt water damage evaluation are remarkably improved.