250 results about "Maximum pressure" patented technology

The invention discloses an anti-liquid-impact compressor cylinder structure, a compressor and a wellhead natural gas compression method, and relates to the technical field of compressors, the cylinder structure comprises a cylinder barrel and a piston ring assembly, a piston cavity is formed in the cylinder barrel, the cylinder structure further comprises a partition plate, the partition plate divides the piston cavity into a working cavity and a buffering cavity, and the piston ring assembly is arranged in the working cavity; the communication channel is used for realizing mutual communication of the working cavity and the buffer cavity on the two sides of the partition plate; the partition plate is configured in the mode that when the pressure difference between the pressure of the working cavity and the pressure of the buffer cavity exceeds a set threshold value, the fixed relation of the partition plate in the piston cavity is damaged under the pressure difference between the two sides of the partition plate, the partition plate can move towards the side where the buffer cavity is located under the pressure difference, the compressor comprises the cylinder body structure, and the compression method is achieved based on the cylinder body structure. According to the scheme, the maximum pressure in the cylinder is reduced by adopting a method of expanding the clearance volume of the cylinder body when the liquid impact phenomenon occurs, and the response speed in the clearance volume expanding process can be effectively optimized.

The invention discloses a pressure controller for a water supply and drainage system and a regulation and control method, and relates to the technical field of emergency protection devices. The method comprises the following steps: acquiring monitoring data of each pressure controller; based on the monitoring data, the pressure value gradient amount of each pressure controller is obtained; obtaining an abnormal region position of the conveying pipeline based on each pressure value gradient amount; obtaining a first pressure controller based on the abnormal region position; and the first pressure controller is adjusted, so that the maximum pressure value of the abnormal area position is smaller than or equal to a standard pressure threshold value. Through the arrangement of the pressure controller capable of measuring the pressure and position of the conveying pipeline, the position where turbulent flow or vortex occurs in the conveying pipeline can be determined, then the pressure of the abnormal area of the conveying pipeline is adjusted based on the corresponding pressure controller, and the situation that the abnormal area of the conveying pipeline is damaged due to the too large pressure is avoided.

The utility model provides an open-loop controlled multifunctional hydraulic pulse test bench, which comprises a storage oil tank, an oil supply pump machine, a reversing valve, a pressurizing oil cylinder and an oil supplementing overflow valve, according to the test bed, a large amount of oil flows into a system at the moment that an oil way is opened by a reversing valve, and due to the fact that an overflow valve has a lag phenomenon in response, oil pressure instantaneously generates an overshoot peak value, pressure in a pipeline rapidly rises and a pressure peak appears, then the overflow valve is conducted, the oil is guided out along the overflow valve, and the pressure in the system is reduced to the set pressure of the overflow valve; water hammer waves and rectangular waves of various waveforms and frequency bands can be generated by adjusting the diameter of a variable damping hole of the one-way throttle valve and the rotating speed of the motor, so that the hydraulic pulse test bed can form hydraulic pulse waveforms of various waveforms and frequency bands; the set pressure of the overflow valve is increased, meanwhile, the travel switch loses efficacy, and when the reversing valve is located at the right position all the time, a damage test can be conducted on the hydraulic pipeline to measure the maximum pressure value capable of being borne by a tested piece.

The invention relates to the technical field of shield tunneling machine construction, in particular to a shield tunneling machine settlement control method which comprises the steps that the maximum pressure and the minimum pressure of a shield tunneling machine in an undercrossing subway tunnel section are calculated according to the burial depth and geological data, and when the shield tunneling machine conducts tunneling, the notch pressure of an excavation face is monitored according to the maximum pressure and the minimum pressure; in the tunneling process of the underpass subway tunnel section, the tunneling speed and the unearthing amount of a shield tunneling machine are monitored, meanwhile, grouting is conducted through radial holes in a shield shell by adopting a plastic material, and a gap, caused by excavation, between a soil body and the shield shell is filled; and when the shield tunneling machine tunnels to the granite layer, slurry injection parameters are controlled. According to the scheme, the safety and reliability of the construction process can be effectively controlled, the construction settlement condition is effectively controlled, it is guaranteed that the safety of the subway tunnel and the surrounding ground is effectively guaranteed, and related potential safety hazards are eliminated.

The invention discloses a marine high-pressure common rail diesel engine MPC combustion control method based on a physical informatization neural network, and belongs to the field of marine high-pressure common rail diesel engine control. The problems that physical consistency of a model and a real machine is ignored and the generalization ability of the model is poor due to the fact that only data driving is relied on are solved. The method comprises the following steps: keeping a combustion midpoint unchanged, and acquiring in-cylinder pressures, in-cylinder maximum pressure rise rates, indication heat efficiency and emission data of different pilot injection fuel ratios and pilot main injection positive time intervals; calculating the average indicated pressure circulation change of the diesel engine, screening data and calculating the accumulated heat release amount and the combustion midpoint; obtaining an influence rule of related characterization parameters of combustion in a diesel engine cylinder, and determining a crank angle corresponding to pilot injection timing, a pilot injection fuel ratio, a pilot main injection interval boundary and an upper limit of a maximum pressure rise rate of cylinder pressure; a diesel engine in-cylinder combustion prediction output model and an MPC controller are constructed; and updating control parameters and combustion state data to realize closed-loop control. The method is used in energy-saving and emission-reducing fields.

The invention relates to the technical field of centrifugal pumps, and particularly discloses a high-leakproofness non-variable-capacity pump and a component thereof, the high-leakproofness non-variable-capacity pump comprises a pump shell and an impeller, the pump shell is provided with a water inlet and a water outlet, the pump shell is in a volute shape, the volute shape comprises a wide section and a narrow section, and the high-leakproofness non-variable-capacity pump further comprises a flow aiding mechanism; the flow dividing device comprises a flow dividing opening and a flow dividing sleeve which are formed in the narrow section of the pump shell, a plurality of liquid inlet holes are formed in the water inlet in a circumferential array mode, and the flow dividing opening and the liquid inlet holes are covered with the two ends of the flow dividing sleeve respectively. According to the centrifugal pump, in the operation process of the impeller, fluid is guided to enter the flow dividing sleeve along the flow dividing opening at the volute-shaped narrow section with the maximum pressure through the flow dividing sleeve, then the flow dividing sleeve supplements the fluid to the water inlet of the pump shell, the negative pressure at the water inlet is supplemented, the cavitation condition is relieved, and the service life of the whole centrifugal pump is prolonged.

The application discloses a centrifugal air compressor surge control method, system, electronic equipment and storage medium, and the centrifugal air compressor surge control method comprises the following steps: obtaining the exhaust pressure variation intensity of a centrifugal air compressor; performing classified control according to the obtained exhaust pressure variation intensity value; when it is detected that the exhaust pressure variation intensity is less than a set maximum pressure variation threshold value and greater than a set minimum pressure variation threshold value, switching the anti-surge valve to an anti-surge automatic control mode; under the anti-surge automatic control, slowly opening the anti-surge valve to introduce airflow into the atmosphere and discharge the airflow; after continuously detecting that the exhaust pressure variation intensity is less than the set minimum pressure variation threshold value and maintaining the set time, switching the anti-surge valve out of the anti-surge automatic control mode and restoring the anti-surge valve to a normal control mode; and when it is detected that the exhaust pressure variation intensity is greater than the set maximum pressure variation threshold value, switching the anti-surge valve to a surge protection mode and switching to a surge fast-opening mode. The application can improve the stability of the centrifugal air compressor.

The invention relates to a method for controlling a hydraulic system (1) for a vehicle having an electrically operated pump (2) that adjusts a system pressure, wherein, for actuating a clutch, the system pressure is controlled between a maximum pressure (p(max)) and a minimum pressure (p(min)) by means of a slave cylinder (6). In order to enable both precise and robust control of the hydraulic system (1), a pressure signal of the system pressure is filtered using different types of filters as a function of at least one operating parameter of the hydraulic system (1).

The invention discloses a shield tunneling machine shield tail sealing pressure monitoring method and device, and the method comprises the steps: receiving pressure data collected by a plurality of pressure sensors disposed in a shield tail sealing cavity, and obtaining the maximum pressure data and the minimum pressure data from the pressure data; the pressure sensors are anticlockwise distributed in the annular shield tail sealing cavity at equal intervals; according to the maximum pressure data and the minimum pressure data, performing normalization processing on each piece of pressure data, mapping the normalized pressure data into a preset standardization interval, and matching the pressure data with a corresponding pressure standard value; mapping the pressure standard value to a preset RGB color gradation interval, matching an RGB value corresponding to the pressure standard value, and generating a pressure cloud picture according to the RGB value; and monitoring pressure data in the shield tail sealing cavity according to the pressure cloud picture. According to the invention, the monitoring precision of the shield tail sealing pressure can be improved, and comprehensive and accurate monitoring is provided for the shield tail sealing state.

The embodiment of the invention discloses a fuel gas safety Rubik's cube and a monitoring method thereof. The Rubik's cube comprises an electromagnetic valve used for controlling opening / closing of a fuel gas pipeline, a pressure sensor used for detecting the pressure of the fuel gas pipeline and a temperature sensor used for detecting the environment temperature. When the fuel gas safety magic cube detects that the real-time pressure value P of the fuel gas pipeline exceeds the maximum pressure preset value PMAX or is smaller than the minimum pressure preset value PMIN through the pressure sensor, the electromagnetic valve is closed. According to the self-closing valve, abnormity detection is more accurate, and the abnormity can be directly improved to be within 5% compared with an existing self-closing valve 25%; the state can be updated in real time, and a user is clear at a glance; according to the invention, the security check of the gas company can be remote, and the operation cost is greatly reduced.

The invention relates to a method for controlling a hydraulic system (1) for a motor vehicle with an electrically operated pump (2) that regulates the system pressure, wherein the system pressure is controlled between a maximum pressure and an opening pressure to actuate a clutch (17) by means of a slave cylinder (6). To prevent damage to the hydraulic system (1) due to excessive system pressure, pressure values ​​of a pressure signal of the system pressure are statistically evaluated after exceeding the maximum pressure over a predetermined measurement interval, and an error is output if a predetermined probability of the pressure values ​​exceeding the maximum pressure is reached.

Systems and methods for determining the impact of air resistance on the power being produced by a body motion are disclosed. In one aspect, a method includes measuring positions and orientations of a portion of the body in motion. The method further includes measuring pressure experienced by the portion of the body in motion. The motion further includes calculating a static pressure based on the measured pressures and correlated position and orientation measurements. The method further includes calculating a maximum pressure and calculating an air induced power exerted on the body in motion.

A dual-redundancy electro-hydrostatic actuator comprises a first motor pump and a second motor pump which are energy assemblies of the electro-hydrostatic actuator; the first motor pump and the second motor pump are respectively provided with a first electromagnetic isolating valve and a second electromagnetic isolating valve which are used for controlling connection and disconnection between the first motor pump and the hydraulic cylinder and between the second motor pump and the hydraulic cylinder; the energy accumulator is an oil supplementing assembly of the electro-hydrostatic actuator, provides stable pressure when the motor pump works at a high speed, and prevents the electro-hydrostatic actuator from sucking air; the one-way valve is located between the energy accumulator and the hydraulic cylinder, the energy accumulator supplies oil to the hydraulic cylinder through the one-way valve, and oil is prevented from reversely flowing back to the energy accumulator; the safety valve plays a role in limiting the maximum pressure of the electro-hydrostatic actuator, and the electro-hydrostatic actuator is prevented from being damaged due to the fact that the pressure exceeds the limit; the sensor is used for judging the working states of the first motor pump and the second motor pump of the electro-hydrostatic actuator, and after signals of the sensor are sent to the controller, the controller achieves fault diagnosis of the motor pumps and triggers updating of system state identifiers.

The invention relates to a method for setting the parameters of a control of a pressure supply system of a hydraulic system, wherein the pressure supply system has a motor (4) and a hydraulic machine (2) that are controlled with a manipulated variable, wherein the control (160) is implemented by a control algorithm, wherein the control algorithm is parameterised by one or more parameters that can be set or changed during operation, the method comprising: carrying out (110), during operation of the hydraulic system, an estimation method based on a physical model in order to determine an estimated value for at least one characteristic variable of the hydraulic system, wherein the at least one characteristic variable includes a hydraulic capacity of the hydraulic system; determining (120) an adjustment time constant as equal to or greater than a target time constant, by means of which a maximum pressure build-up rate of the hydraulic system is achieved, which is determined by the estimated value for the hydraulic capacity and a maximum volumetric flow rate of the hydraulic machine; setting (150) at least one parameter of the one or more parameters, wherein the at least one parameter is determined (130, 140) by a respective function dependent on the setting time constant.

The invention discloses a method for producing high alloy steel through continuous casting. The method comprises the steps that the specific water flow of a continuous casting billet of the high alloy steel at the pulling speed is reduced in the continuous casting billet production process; the roll gap of the driven roll in the fan-shaped section behind the light downward pressing section is set to be a parallel roll gap or an open roll gap, and the rolling reduction of the light downward pressing section is kept unchanged; and the maximum pressure of the first oil cylinder in the fan-shaped section behind the light downward pressing section is set to be 160 bar or below. The cooling strength of a continuous casting billet is reduced by reducing the specific water flow at each pulling speed of the continuous casting billet of high alloy steel in production, so that the temperature of the continuous casting billet is increased, and the strength of a billet shell and the continuous casting billet is reduced; by reducing the total rolling reduction of a fan-shaped section roll gap and the maximum pressure of a first oil cylinder, the positive pressure of the fan-shaped section on a blank shell and a continuous casting blank is reduced, and the average torque of a driving roll is reduced; the problem that the continuous casting billet cannot be pulled when the high alloy steel continuous casting billet is produced is solved, the occurrence rate that the continuous casting billet cannot be pulled is reduced to 0 time per furnace of molten steel, and the service life of the fan-shaped section is prolonged to more than 6500 furnaces of molten steel.

To provide a technique capable of estimating a pressing position even when there are a plurality of touch positions.SOLUTION: A pressing position estimation system comprises: a touch panel which detects a touch position on a detection surface and a quantity related to a pressing position on the detection surface; a pressure sensor which detects the amount of pressure applied to the detection surface; a load calculation unit which, when the pressing position is continuously being detected, continuously acquires a pressure amount from the pressure sensor, holds the pressure amount first acquired when the pressing position is continuously being detected as an initial value, holds the largest pressure amount acquired when the pressing position is continuously being detected as a maximum value, calculates a difference between the maximum value and the initial value as a load, and associates the calculated load with the pressing position; and a determination unit which determines the validity of the pressing position on the basis of the load.SELECTED DRAWING: Figure 2

The present invention discloses a method for anti-explosion experiment of castables, belonging to the technical field of refractory material testing. It includes an experimental chamber, a hatch door and several pipelines, and also includes a limiting mechanism, a pressing mechanism, a pressurizing mechanism and an adjusting mechanism. The hatch door is installed on the side wall of the experimental chamber, the limiting mechanism is hinged on the inner wall of the experimental chamber, the pressing mechanism is installed on the inner top of the experimental chamber, and a detachable heating rod is provided at the bottom of the pressing mechanism. The pressurizing mechanism is installed on the top of the experimental chamber and the pressurizing mechanism is connected to the pressing mechanism through a pipeline. The adjusting mechanism is installed at the bottom of the pressing mechanism and is located at the bottom end where the pressurizing mechanism is connected to the pressing mechanism. The present invention provides an anti-explosion experiment system and its experimental method for castables used in waste incineration, to conduct experiments on the anti-explosion performance of castables. First, it experiments whether the castables will burst when heated, and secondly, it experiments on the internal air pressure when the castables burst, so as to mark the maximum pressure range inside the castables.

The present invention relates to a method for estimating the pressure in an intake manifold of an indirect injection combustion engine, comprising: a pressure sensor measuring the pressure in the intake manifold, the intake manifold being in fluid communication with a combustion cylinder in which a piston is guided in translation and connected to a rotating crankshaft. The method comprises the following steps: measuring, by the pressure sensor, a maximum pressure value substantially corresponding to the maximum pressure in the intake manifold during a previous engine cycle; measuring, by the pressure sensor, a minimum pressure value substantially corresponding to the minimum pressure in the intake manifold during a previous engine cycle; determining, based on the crankshaft angular position and the engine speed, a precalculated average correction factor for the pressure; and estimating, based on the average correction factor and the minimum and maximum pressure values, the pressure in the intake manifold for the crankshaft angular position of the current engine cycle.

The invention provides a method for generating performance degradation data of a train air braking system. The method comprises the following steps: on the basis of a brake system of a preset model, analyzing three stages of pressure rise, maximum pressure and pressure stability of pressure change of a brake cylinder, and extracting a plurality of typical fault modes; based on an extended random process model with non-monotonicity and independent incremental property, three stages of pressure change of a brake cylinder and multiple typical fault modes are combined, and linear, nonlinear or stepped performance degradation process modeling of the train air brake system is carried out; overlapping normal distribution random noise on a performance degradation track generated by modeling, simulating a control precision error of an actual braking system, and optimizing a performance degradation process model of the train air braking system; and utilizing the train air braking system performance degradation process model to generate train air braking system performance degradation data in batches.

The present application relates to a kind of design methods of cementing annular slurry column, comprising the following steps: 1) collecting the leakage parameter of the weakest formation in the formation to be cemented, the leakage parameter of the second weakest formation, the bottom hole leakage parameter and the maximum formation pressure parameter;2) calculate the maximum pressure bearing parameter at the weakest formation when cementing operation is bumped, the maximum pressure bearing parameter at the second weakest formation when cementing operation is bumped, the maximum pressure parameter that bottom hole bears when cementing operation is bumped and the bottom hole pressure parameter when tail slurry gelatinization loses weight during cementing operation;3) according to the leakage parameter of the weakest formation, the leakage parameter of the second weakest formation, the bottom hole leakage parameter and the maximum formation pressure parameter, the maximum pressure bearing parameter at the weakest formation when cementing operation is bumped, the maximum pressure bearing parameter at the second weakest formation when cementing operation is bumped, the maximum pressure parameter that bottom hole bears when cementing operation is bumped and the bottom hole pressure parameter when tail slurry gelatinization loses weight during cementing operation, it is judged whether annular slurry column is designed reasonably.

The invention relates to the technical field of pressure reducing valves, and discloses a novel pressure reducing valve with two-stage pressure regulating precision, which comprises a pressure regulating valve assembly, a first-stage cylinder assembly and a second-stage cylinder assembly are sequentially arranged on the right side of the pressure regulating valve assembly, the pressure reducing valve assembly comprises a valve body and a valve core, and an oil supply port P, a pressure outlet A and an oil drainage port T are respectively formed in the side wall of the valve body. A pressure sensor is arranged at the pressure outlet A; the first-stage air cylinder assembly comprises a first-stage cylinder body and a first-stage piston, the second-stage air cylinder assembly comprises a second-stage cylinder body and a second-stage piston, the valve element, the first-stage piston and the second-stage piston are sequentially connected and coaxially arranged, and air sources are introduced into the left side and the right side of the first-stage piston and the left side and the right side of the second-stage piston respectively to control the valve element to move leftwards and rightwards. The oil supply port P, the pressure outlet A and the oil drainage port T are switched to be connected and disconnected, and the stress balance state of the left side and the right side of the valve element is achieved. According to the invention, the pressure can be adjusted from 0ba, the maximum pressure adjustment range is applied to 20bar, and accurate pressure adjustment can be realized in a small pressure range.

Disclosed is a method for depowdering a part (3) produced by additive manufacturing, the part comprising a cavity (15) to be depowdered, the cavity comprising a first opening (151), the method comprising steps of: a) pressurising the cavity by injecting a gas up to a predetermined maximum pressure through the first opening; b) suddenly releasing the pressure within the cavity by quickly switching from the predetermined maximum pressure to a purge pressure.

The present invention discloses a design method for a high-lift, high-speed, two-stage shielded pump capable of balancing axial forces. By differentiating and refining the front and rear cover plates of the centrifugal impeller, the force difference between the front and rear cover plates of the two-stage impeller is used to balance the axial force directed toward the inlet of the first-stage impeller due to the high pressure at the inlet of the secondary impeller of the two-stage shielded pump. The steps are as follows: determining the basic performance parameters of the pump to be designed; determining the basic structure of the pump; allocating the outlet head of the two-stage impeller; determining the impeller parameters; respectively calculating the axial force generated by the asymmetry of the front and rear cover plates of the two-stage impeller, the fluid dynamic reaction force on the impeller, and the axial force generated by the pressure difference between the inlets of the two-stage impeller; calculating the axial resultant force. If it is less than the maximum pressure that the thrust bearing assembly can withstand, the design is completed. Otherwise, the outlet head of the two-stage impeller is redistributed and the impeller geometric parameters are adjusted until the requirements are met. This method does not add additional axial force balancing measures. The centrifugal pump designed by this method is highly efficient and reliable in operation.

A pneumohydraulic pressure intensifier includes at least one pneumatic piston that is coupled to a hydraulic pump. The pressure intensifier includes a regulator which allows to set the hydraulic output pressure. The regulator is coupled to a hydraulic pilot control valve which is adapted to interrupt the air supply to the pneumatic piston when a set maximum pressure is reached.

The invention discloses a supercritical CO2 stable pressurization method based on compression factor change, which comprises the following steps: determining a temperature threshold value of exhaust temperature of each stage of pressurization according to pressurization parameters, and then setting the stage number to be pressurized, the exhaust pressure and the exhaust temperature of each stage and the intake temperature of the next stage; obtaining a change rate trend chart when the compression factor z changes along with the temperature and the pressure; according to the change rate trend chart, determining the change rule of the compression factor z along with the temperature under each stage of intake and exhaust pressure, and limiting the change range of the compression factor z within a set change rate range; secondly, an inter-stage temperature precise control system is arranged in the process from each stage of exhaust to next stage of air inlet, and the temperature is precisely controlled to be within the next stage of air inlet temperature fluctuation range set in the first step according to the change rate range set by the compression factor z and the temperature control limiting range. According to the invention, CO2 and CO2 mixed gas can be pressurized from a conventional gas state to a supercritical state, the highest pressure after pressurization can reach 50 MPa, and the high-pressure gas injection requirement of a CCUS project is met.

The invention discloses a hydrogen cost determination method and device of a hydrogen refueling station, a medium and electronic equipment. The method comprises the following steps: equally dividing a pressure interval from zero to maximum pressure of a hydrogen storage tank into a plurality of unit pressure intervals; at first time, determining first hydrogen mass and first hydrogen cost corresponding to the unit pressure interval; hydrogen fixed cost, hydrogen compressor parameters in a target time period and a time difference are obtained, the target time period is a time period from the first time to second time, the time difference is a difference value between the second time and the first time, and the second time is after the first time; and according to the first hydrogen mass, the first hydrogen cost, the hydrogen compressor parameters, the time difference and the hydrogen fixed cost, the second hydrogen cost corresponding to the unit pressure interval at the second time is determined. According to the invention, the hydrogen cost of the hydrogen refueling station can be accurately calculated.

Braking system for a vehicle with a master brake cylinder (2), a fluid control unit (3) and at least one wheel brake (4.1, to 4.4), wherein the fluid control unit (3) for brake pressure modulation of the at least one wheel brake (4.1 to 4.4) in at least one brake circuit (10, 20) comprises a switching valve (12, 22), a control valve (50A, 50B) and a return pump (15, 25) for each brake circuit (10, 20), wherein the control valves (50A, 50B) are each connected in a suction line between the corresponding return pump (15, 25) and the master brake cylinder (2) and limit the effective pressure at a suction side of the respective return pump (15, 25) to a predefinable maximum pressure value, wherein a first fluid port (51A, 51B) of the respective control valve (50A, 50B) is connected to the The master brake cylinder (2) and a second fluid connection (52A, 52B) of the respective control valve (50A, 50B) are coupled to the respective return pump (15, 25), characterized in thatthat a pressure-relieved port (53A, 53B) of the respective control valve (50A, 50B) is coupled to a fluid accumulator (16, 26), wherein the respective control valve (50A, 50B) comprises a longitudinally movable control piston (54) which is acted upon on the pressure-relieved side by an actuating spring (55) with a spring force and in an initial position completely opens a fluid connection between the first fluid port (51A, 51B) and the second fluid port (52A, 52B) with a maximum flow cross-section, wherein a pressure building up at the first fluid port (52A, 52B) moves the control piston (54) against the spring force of the actuating spring (55) in the direction of the pressure-relieved port (53A, 53B), wherein the flow cross-section of the fluid connection between the first fluid port (51B) and the second fluid port (52B) 52B) can be reduced by the movement of the control piston (54), wherein the fluid connection between the first fluid port (51A,51B) and the second fluid port (52A, 52B) is completely interrupted by a stop position at the specified maximum pressure value at the second fluid port (52A, 52B), and wherein the spring force of the actuating spring (55) moves the control piston (54) from the stop position back towards the starting position when the current pressure at the second fluid port (52A, 52B) falls below the maximum pressure value.

The application discloses a hydrogen production and hydrogenation integrated station control method, which comprises hydrogen production equipment, a hydrogen buffer tank, a first-stage compressor, a first-stage hydrogen storage tank, a second-stage compressor, a second-stage hydrogen storage tank and hydrogenation equipment which are sequentially connected; during hydrogenation, the hydrogen production equipment, the first-stage compressor, the second-stage compressor and the hydrogenation equipment are controlled to work according to the relationship between the pressures of the hydrogen buffer tank, the first-stage hydrogen storage tank, the second-stage hydrogen storage tank and the hydrogenation equipment when the hydrogenation equipment works and the maximum filling pressure allowed for the hydrogenation equipment, the first preset pressure, the second preset pressure, the maximum allowable working pressure of the second-stage hydrogen storage tank, the fourth preset pressure, the minimum inlet air pressure of the first-stage compressor, the maximum allowable working pressure of the first-stage hydrogen storage tank, the third preset pressure, the maximum allowable working pressure of the hydrogen buffer tank and the minimum inlet air pressure of the second-stage compressor. The application realizes on-demand start and stop of hydrogen production, reduces loss, prolongs the service life of equipment, reduces cost and production hidden danger.

One aspect of the present disclosure provides a method for controlling a multi-fuel engine system configured to use gaseous fuel and hydrogen, in which a maximum pressure and a combustion center of a cylinder may be detected while the multi-fuel engine system is operating, and a ratio of hydrogen to be mixed with the gaseous fuel may be determined based on the detected maximum pressure in the cylinder and the combustion center.

The invention relates to a forging return stroke electro-hydraulic system adopting discrete liquid volume units and a control method.The system comprises a plurality of oil tanks connected with a controlled pressure containing cavity in parallel at the same node, and the first end and the second end of each oil tank are connected with a reversing valve and a one-way valve correspondingly to form a volume unit capable of being independently gated; all the oil tanks jointly form a parallel oil tank group; the plunger type cylinder is connected with a node of the parallel oil tank set, oil in the plunger type cylinder flows into the return oil tank to be compressed when the hammer head enters, and oil in the return oil tank flows into the plunger type cylinder to provide return force for the hammer head when the hammer head retreats. According to the working frequency requirement, the forging force requirement and the oil elasticity modulus fluctuation condition of the hammer head, the return stroke oil tank is controlled to reach the maximum volume allowed by the working condition through the combination of discrete volume units, and meanwhile the set pressure of the system is adjusted according to the maximum pressure value of the plunger cavity; the pressure curve of the plunger cavity can cover the minimum return stroke pressure requirement in real time, and the return stroke requirements of the hammer head under various working conditions of different working frequencies, forging forces and different oil liquid elasticity moduli in a large range are met.