141results about How to "High precision of pressure control" patented technology

The invention relates to a brake-by-wire system of an automobile and belongs to the technical field of automobile brake systems. In the brake system, a vacuum booster of the traditional vacuum booster hydraulic brake system is replaced with a motor, and a piston in a brake main cylinder is pushed to move to generate brake hydraulic pressure, so that dependence on vacuum degree of an engine is canceled; through the adoption of a pedal simulator, influences on feelings of a brake pedal during coordinated control of feedback and brake are eliminated; a hydraulic control unit of the traditional brake system is kept to implement hydraulic adjustment; and as a standby hydraulic brake system is integrated, braking with certain strength can be implemented by a driver under a situation that the power supply of the system is ineffective. Compared with the traditional distributed brake-by-wire scheme, the brake-by-wire system provided by the invention has the advantages as follows: the structure is changed when compared with the structure of the traditional vacuum booster hydraulic brake system, the system can be mounted on the automobile more conveniently, and more existing technologies in the traditional brake system can be succeeded in the control aspect.

The invention discloses a pressure control device for an equalizing reservoir of a motor vehicle. The pressure control device comprises a closed-loop main control part and a backup control part, wherein the closed-loop main control part comprises a pressure sensor, an air inlet branch, an air exhaust branch and a proportion controller; the pressure sensor is connected into the equalizing reservoir; the air inlet branch is formed by the serial connection of a main air control cock, a pressure regulating valve, an air inlet high-speed electropneumatic valve and a conversion valve in sequence; the main air control cork is connected with a main air delivery outlet, and the conversion valve is connected into the equalizing reservoir. The air exhaust branch is composed of an air exhaust high-speed electropneumatic valve and a conversion valve connected into the equalizing reservoir. The air inlet high-speed electropneumatic valve and the air exhaust high-speed electropneumatic valve are respectively connected with the control end of the proportion controller, and the signal input end of the proportion controller is connected with the output end of the pressure sensor. The backup control part comprises a control cork, a pressure regulating valve and a backup brake valve which are sequentially connected in series; the control cork is connected with the main air delivery outlet, and the backup brake valve is connected into the equalizing reservoir. The pressure control device carries out closed loop control on the pressure of the equalizing reservoir and has high controlling precision, and meanwhile adopts redundancy control on the pressure of the equalizing reservoir so as to improve the controlling reliability; the equalizing reservoir can automatically reduce pressure and discharge air to carry out automatic protection when system failure or power failure occurs, so that the safety of the motor vehicle can be improved.

The present invention discloses an extra high pressure pneumatic proportional reducing valve, and it is characterized by that it adopts proportional pilot valve and electric feedback technique to implement full automatic pressure control, save human resources and raise reaction speed. Its main valve adopts gas pressure control, regulated pressure is high, the designed maximum input pressure can be up to 40 MPa, and output pressure is 0-25 MPa, and said pressure can be continuously regulated. Its pilot-level gas circuit adopts C-type semibridge structure, the pilot valve controlled by proportional electromagnetic iron is formed into the dynamic damping of input end, the damping plate can be used as fixed damping of output end. The input end of pilot valve is led from air inlet end of reducing value, and its output end is connected with air outlet end of the reducing valve. After the system is powered off, the pilot valve and main valve can be automatically closed by action of reset spring and gas pressure.

The invention provides a grinding head, the surface in contact with the wafer is circular, and the circular surface has more than 5 relatively independent areas, each area is connected with a corresponding pneumatic device, and the pneumatic device is used for each grinding head. Zones provide pressure. The present invention also provides a chemical mechanical polishing machine platform comprising the above-mentioned polishing head. The adoption of the device of the invention effectively improves the uniformity of grinding wafers.

The invention discloses a valve body detection system of an automatic gearbox. The detection system comprises a pneumatic and hydraulic system, a measuring and control system and a platform, and boththe pneumatic and hydraulic system and the measuring and control system are arranged in the platform; the pneumatic and hydraulic system is composed of a hydraulic subsystem and a pneumatic subsystem,and is used to provide a pressure, flow and temperature controllable test medium; and the measuring and control system is used for parameter adjustment, data collection and processing and distribution protection of the pneumatic and hydraulic system; and an operation control panel is arranged on the platform, and used to adjust the oil liquid temperature, working pressure and flow. Via the detection system, the temperature range of the test medium is wider, and the measuring precision and system integration degree are high.

The invention claims to protect a pilot control branch pipeline flow stabilization regulation apparatus which comprises a main valve and a pilot valve. The main valve comprises a main valve body, a main valve inlet positioned in the lower part of the main valve body and a main valve element lower cavity; a main valve element is mounted inside the main valve body; the main valve element is communicated with the main valve element lower cavity by a main valve element damping hole; the main valve element is connected with a main valve element upper cavity; a main valve spring is arranged at the middle position of the main valve element upper cavity; one end of the main valve spring is fixed on the main valve element, and the other end of the main valve spring is positioned at the upper part of the main valve element upper cavity; the pilot valve comprises a pilot valve body and a regulation handle arranged in the pilot valve body; the regulation handle is provided with a pilot valve spring along the axial end; a pilot valve element is arranged in the pilot valve body; an inner cavity of the pilot valve body is communicated with the main valve element lower cavity by a buffer hole; by a piston, the pilot valve element interacts with a pressure medium at a pressure acquisition point, which is introduced by a pressure introduction hole. The apparatus balances and regulates pressure in a refueling pipeline.

The invention relates to a vehicle braking system, in particular to a multi-chamber brake master cylinder system with a pedal feel simulator; comprising a brake pedal, a push rod one, a master cylinder block, an oil pot and a booster system; the The master cylinder includes a T-shaped piston, a first piston, and a second piston; the brake pedal is connected to the T-shaped piston through a push rod one, and the T-shaped piston and the first piston form a first chamber, and the second A piston and the second piston form a second chamber, and the second piston and the master cylinder form a third chamber; a baffle is arranged between the T-shaped piston and the master cylinder, and the T-shaped baffle and the T-shaped The piston forms a pressurized chamber, and the pressurized chamber is connected with the pressurized system; the oil pot is respectively connected with the first chamber and the second chamber; the effective cross-sectional area of ​​the T-shaped piston is smaller than the effective cross-sectional area of ​​the first piston. cross-sectional area; this system improves the pressure control accuracy of the master cylinder, reduces pressure fluctuations in the brake master cylinder during active boosting, makes the braking force smoother, and improves the user's driving experience.

The invention relates to a control system of an air compressor, which belongs to the technical field of air compressor control. According to the control system of the air compressor, disclosed by the invention, the output pressure of compressed air of the air compressor is used as a control object, the regulation of motor speed by air demand is realized by using a variable frequency speed regulating mode, the pressure at an air outlet can rise when the air consumption is reduced, the pressure can be fed back to a frequency converter through a pressure sensor, the motor speed can be slowed down, and the shaft output power can be reduced; the pressure of the air outlet drops when the air consumption is increased, the motor speed is quickened, and the shaft output power is increased; and therefore the air compressor control system disclosed by the invention has the advantages that the pressure control accuracy can be controlled, the energy source is saved, the running cost is reduced, the noise of the air compressor is reduced at the same time, and the service life of the air compressor is prolonged.

An electric pressure cooker is composed of a main body, a cover unit with internal cover, an internal pot, a sealing ring between internal cover and internal pot, and a pressure control unit arranged on cover unit and consisting of pressure sensing valve and shift detector. Its advantages are high pressure controlling accuracy and high reliability.

The invention discloses a constant pressure oil line system and a constant pressure control method in the process of graphitizing a carbon product. The method comprises the following steps of 1, inputting a load characteristic curve of a hydraulic cylinder into a control system; 2, starting an oil pump, and injecting hydraulic oil into the hydraulic cylinder and an energy accumulator through a three-position reversing valve and a two-position reversing valve respectively; and 3, comparing the load characteristic curve input into the control system and the preset load characteristic curve according to data fed back by a pressure sensor and a displacement sensor, wherein (a) when pressure of a rear cavity of the hydraulic cylinder and displacement of a piston of the hydraulic cylinder are on the load characteristic curve, the control system adjust output pressure of a proportional pressure-reducing valve in advance; (b) when deltaP is smaller than or equal to the adaptive pressure adjusting range of the constant pressure oil line system, the proportional pressure-reducing valve adjusts the output pressure; (c) when deltaP is greater than the adaptive pressure adjusting range of the constant pressure oil line system, the control system controls the output pressure of the proportional pressure-reducing valve; and (d) when the deltaP exceeds the pressure adjustment range of the control system, the control system controls the hydraulic system for emergency stop. By adoption of the constant pressure oil line system and the constant pressure control method, contact pressure output by the hydraulic cylinder can be accurately controlled.

The invention discloses a proportional type proportional pressure reducing valve and belongs to the technical field of pressure reducing valves. A piezoelectric actuator is connected with a pilot valve element. The pilot valve element is matched with a pilot valve seat to form a pilot valve port. A main valve upper cavity is formed between a pilot valve oil supply device and the pilot valve seat. A main valve element damper is arranged in a main valve element. A shoulder of an upper section of the main valve element and the edge of a sinking and cutting groove in the upper portion of a valve body are matched to form an oil draining valve port, a shoulder of a lower section of the main valve element is matched with the edge of a sinking and cutting groove in the lower portion of the valve body to form an oil inlet valve port, and a shoulder of a middle section of the main valve element corresponds to a sinking and cutting groove in the middle portion of the valve body to form an output and flow guide part. The valve body is arranged in a valve block. An oil inlet and an oil draining port of the valve block communicate with the oil inlet valve port and the oil draining valve port correspondingly. A load opening of the valve block communicates with the sinking and cutting groove formed in the middle portion of the valve body, and a zero adjustment spring is arranged in a main valve lower cavity. Partial pressure of the pilot valve port and a throttling hole of the pilot valve oil supply device is used as a main valve element instruction, and the zero adjustment spring is used for expanding the pressure adjusting range. By means of the proportional type proportional pressure reducing valve, the output pressure of the valve and the input pressure of the valve can change proportionally.

A double-closed-loop redundancy pressure control system of a coil hydraulic press comprises a PLC (programmable logic controller) used for controlling the coil hydraulic press, a touch screen exchanging parameters with the PLC through a bus and an industrial personal computer exchanging complex operation functions with the PLC through the industrial Ethernet. The PLC is connected with one end of each of a variable frequency motor, a high-frequency response servo valve and a proportional pressure valve, the variable frequency motor, the high-frequency servo valve and the proportional pressure valve are controlled through the PLC, the other end of the variable frequency motor is connected with a metering pump driven by the variable frequency motor, the other end of each of the metering pump, the high-frequency servo valve and the proportional pressure valve is connected with a hydraulic cylinder of the coil hydraulic press driven through each of the metering pump, the high-frequency servo valve and the proportional pressure valve, the other end of the hydraulic cylinder is connected with a pressurized platform driven through the hydraulic cylinder, a pressure sensor connected with the PLC and feeding back pressure feedback signals of the hydraulic cylinder to the PLC is arranged on the hydraulic cylinder, and a force sensor connected with the PLC and feeding back stress signals of a coil to the PLC is arranged on the pressurized platform. The double-closed-loop redundancy pressure control system has the advantages that double-closed-loop redundancy control is realized, the system is highly integrated, stable and reliable pressurization is achieved, and pressure control is high in precision and timeliness.

The invention relates to a computer test control system for pressure alternating test of an air-air intercooler. The computer test control system comprises an industrial personal computer, a data collecting module, a temperature sensor, a pressure sensor, a touch screen and a programmable controller, wherein the industrial personal computer is connected with the display screen and the programmable controller, the programmable controller is respectively connected with the data collecting module and the touch screen, the data collecting module is respectively connected with the temperature sensor and the pressure sensor, the computer test control system collects one to three circulation data of an air circulating system at the set time interval, the temperature, the pressure, the set value, the real-time operation curve, the wave form and the warning signal during the real-time operation of the air circulating system are displayed on the display screen, and values are regulated on the touch screen for measuring the fatigue resistance intensity of test pieces. Compared with the prior art, the computer test control system has the advantages that the structure design is novel and practical, the operation and the maintenance are convenient, the safety performance is higher, and the like.

The invention belongs to the field of deepwater well drilling of petroleum engineering, and particularly relates to a seabed wellhead pressure indicating and automatic adjusting device for deepwater dual-gradient well drilling. The seabed wellhead pressure indicating and automatic adjusting device for the deepwater dual-gradient well drilling comprises a seabed drilling fluid manifold system and a seabed wellhead pressure indicating and automatic adjusting device, wherein the seabed drilling fluid manifold system provides a flowing channel to shaft returning and drilling fluid so that the drilling fluid can successfully return to a drilling platform and provide a foundation to the seabed wellhead pressure indicating and automatic adjusting device; the seabed wellhead pressure indicating and automatic adjusting device can display and adjust seabed wellhead pressure in real time, and keep seabed wellhead pressure to be constantly equal to seawater hydrostatic pressure at the seabed. According to the seabed wellhead pressure indicating and automatic adjusting device for the deepwater dual-gradient well drilling provided by the invention, the seabed wellhead pressure can be automatically kept to be constantly equal to the hydrostatic pressure of seawater deepwater dual-gradient well drilling process at the seabed so that the dual-gradient well drilling can be ensured to be successfully implemented.

The invention relates to an 80 percent limit filling serviceability test bed which is used for an 80 percent limit filling and loading serviceability test of an LPG (liquefied petroleum gas) gas cylinder integrating valve for a vehicle, and according to a dedicated test bed which is designed according to requirements and regulations in GB18299 Liquefied Petroleum Gas Steel Cylinder Integrating Valve for a Motor Vehicle, the test bed consists of an electrical control part and a water pressure part, the electrical part comprises a control system and a computer display system, and the water pressure part mainly consists of a gas drive liquid pump, an energy accumulator, a pressure reducing valve, a centrifugal water-pump and the like. The combination of the energy accumulator and the pressure reducing valve can precisely control the pressure difference of two ends of a valve to be tested, and the test bed has the characteristic of stable pressure, thus guaranteeing the test pressure to meet the demands of GB18299 standards completely.

The invention discloses an ultrahigh pressure testing system and a control method thereof. The ultrahigh pressure testing system comprises a liquid box, a first control valve and a servo supercharger. The liquid box is connected with the first control valve and the servo supercharger in sequence. The servo supercharger is connected with a pressure testing device. A second control valve is connected between the servo supercharger and the pressure testing device. A first pressure detection module is arranged between the first control valve and the second control valve. A second pressure detection module is arranged between the pressure testing device and the second control valve or in the pressure testing device. The technical purpose of the invention is to provide the ultrahigh pressure testing system which uses the servo supercharger as a power source to ensure high precision and high pressure of medium pressurization and intelligently control the pressure rising/reducing rate, and provide the control method of the ultrahigh pressure testing system to realize automatic control in the pressure testing process.

The invention relates to an automobile brake system, in particular to a novel brake-by-wire system; it improves the pressure control accuracy of the master cylinder, reduces pressure fluctuations in the brake master cylinder during active pressurization, reduces fluctuations in braking force, makes the braking force smoother, and improves The user’s driving experience, the present invention uses a hydraulic direct-feedback pedal feeling simulator, removes the spring in the original simulator, and directly feeds back the pedal braking force through hydraulic pressure, and at the same time only needs to choose different push rod diameters to feedback different pedal feel The present invention includes: brake pedal, brake master cylinder, supercharger, oil pot, control system and brake terminal; brake pedal is connected with brake master cylinder, and brake master cylinder is connected with booster device and oil The outlet of the brake master cylinder is connected to the control system and the brake terminal; the booster device is connected to the oil pot through the pressure sensor and the normally open solenoid valve; the booster device includes a booster cylinder, a piston and a motor; the piston is set in the booster Inside the cylinder, an electric motor pushes the piston to pressurize.

The present invention provides an apparatus comprising a wound dressing 15 connected to a pump 3 and a fluid container 11, which has an inlet 2 and an outlet 4, and wherein the wound dressing is in communication with a mechanical pressure control valve 13. Also provided is a flexible fluid container comprising at least two layers of film (21, 23, see figure 3) with an integrated vent, which may be a microporous, hydrophobic membrane 29; a wound dressing comprising a porous pad, a flexible covering and a connection to a control valve; a multi-compartment wound fluid container (35, 63, see figures 6 or 7) comprising at least two internal compartments divided by a microporous fluid separator 41, 55 and provided with an inlet 49, 59 and an outlet 37, 51, wherein the microporous fluid separator permits gas flow between the compartments and prevents fluid flow to the outlet of the container; and a means for detecting the level of fluid in a multi-compartment container comprising a strap with limited extensibility.

The invention discloses a large-flow air-control corrugated pipe type pressure reducing valve. An inlet cavity (2), an outlet cavity (4), a damping cavity (6), a control cavity (7) and an unloading cavity (9) are sequentially arranged in a valve body from top to bottom. The large-flow air-control corrugated pipe type pressure reducing valve is characterized in that the front end of the valve inlet cavity (3) is externally provided with a bypass pipeline (23) communicating with the unloading cavity (9), and the acting force applied by a medium to a throttling valve element (13) is balanced. Compared with the prior art, the large-flow air-control corrugated pipe type pressure reducing valve has the remarkable beneficial effects that a metal corrugated pipe serves as a sensitive element of the pressure reducing valve, rigidity is small, sensitivity is good, the effective area is large and the mass is small, and therefore the kind of valve has the beneficial effects of being high in outlet pressure control precision, stable in pressure, large in flow, small in dynamic-static pressure difference, good in dynamic characteristic and the like; and the unloading cavity can be used for counteracting the acting force applied by the high-pressure gas medium to the throttling valve element, the opening conditions of the throttling valve element are improved, the loads of the sensitive element are reduced, and the service life of the metal corrugated pipe is prolonged.