41 results about "Pressure decrease" patented technology

The disclosure relates to a leak detection system for a pneumatic braking system of a vehicle. The pneumatic braking system has a control unit, a pneumatic circuit, and an air tank configured to supply pneumatic pressure to the pneumatic circuit. The pneumatic circuit has a plurality of valves configured to be individually controlled by the control unit. The link detection system includes program code configured, when executed by a processor, to individually control the valves of the pneumatic circuit so as to isolate a sub-circuit of the pneumatic circuit. The leak detection module is configured to monitor a pressure in the pneumatic circuit for leaks, wherein the leak detection module detects a leak in the sub-circuit if the pressure decreases while the sub-circuit is isolated.

The application is a gradually expanding high-pressure hydrogen pressure reducing valve, comprising: a first valve body with an air inlet; a second valve body fixed on the top of the first valve body, with a pressure reducing cavity between the first valve body and the second valve body; an air outlet on the second valve body; a guide in the pressure reducing cavity; a valve core through the guide; a first elastic member with a spring seat between the bottom of the valve core; an adjusting mechanism on the top of the second valve body, suitable for adjusting the limit stroke of the valve core; a plurality of pressure reducing channels on the surface of the valve core; the pressure reducing channels comprise N pressure reducing grooves connected in a head-to-tail manner, the two connected pressure reducing grooves are arranged in an inclined manner, the first pressure reducing groove to the Nth pressure reducing groove, and the width and depth of the pressure reducing grooves gradually increase; the pressure reducing channels are used for reducing the pressure of hydrogen, and the pressure of high-pressure hydrogen can be reduced to the use range by using a one-stage pressure reducing structure, the structure is simple and compact, small in size, light in weight, and good in reliability.

A manufacturing apparatus includes a chamber, a pressure reducing device, and a return pipe. The pressure reducing device is configured to reduce the pressure in the chamber. The return pipe includes a first opening, a conduit, and a second opening. The first opening and the second opening are respectively and independently open to the interior of the chamber. The first opening is connected to an exterior body. The conduit connects the first opening and the second opening. The conduit is configured to once draw gas in the exterior body out of the chamber when the pressure in the chamber is reduced, and return the drawn gas into the chamber.

This technology provides a way to determine the state of air control valves and flow paths used in vehicle brakes without requiring any special operation. [Solution] The state determination device 100 is a state determination device 100 that determines the state of at least one of an air control valve and a flow path used in a vehicle brake, and the air control valve includes an acquisition unit 110 that discharges air at an output pressure corresponding to the input pressure, which is the pressure of the introduced air, into a supply flow path to the brake cylinder, acquires first measured values ​​of the input pressure and output pressure at one or more timings during the pressure-increasing period when the input pressure increases, and acquires second measured values ​​of the input pressure and output pressure at one or more timings during the pressure-reducing period when the input pressure decreases, a calculation unit 120 that calculates the difference between at least one of the input pressure and output pressure during the pressure-increasing period and the pressure-reducing period based on the first measured value and the second measured value, and a determination unit that determines the state of at least one of the air control valve and the flow path according to the difference.

A method for determining properties of hydraulic fractures from measurements of pressure in a well made after stopping pumping fracturing fluid into the well (shut in) includes determining a first time after shut in whereinafter a decrease in measured pressure is caused by fluid leak off in a fracture. A second time after shut in is determined whereinafter the decrease in pressure is caused by fluid leak off, fracture growth and fluid pressure equilibration in the fracture. A third time after shut in is determined whereinafter the decrease in pressure is caused by fluid leak off, fracture growth, fluid pressure equilibration in the fracture and pressure drop in a near wellbore zone. Values of fluid efficiency, minimum stress and net pressure which are determined result in a calculated pressure with respect to time matching the pressure measurements within a predetermined threshold.

An interface bonding failure test method, system, storage medium and program product, relate to the field of testing or analyzing materials by means of determining chemical or physical properties of materials, in the method, the interface bonding state between the pole piece coating and the current collector is evaluated by performing a single loading and unloading cycle. In the loading stage, a first resistance value is measured when the pressure reaches a preset target detection pressure, and then the pressure is continuously increased to a preset peak pressure (the pressure is greater than the target detection pressure but less than the yield strength of the current collector). In the unloading stage, a second resistance value is measured when the pressure decreases back to the preset target detection pressure. By comparing the difference between the two resistance values with a preset hysteresis threshold, the interface bonding state is determined: if the difference is greater than the threshold, it is determined that there is interface bonding failure. The present application is used to reduce the difficulty of identifying overpressure risk and defining the best roll pressure process window.

A leak control system (26) for an evacuation system (12) of an insufflation system (1), for controlling leakage of insufflating gas from a vessel (5) of a subject being insufflated. An evacuation conduit (20) connects a Venturi vacuum creating device (14) to the vessel (5) through a pressure relief valve (27) operable from a closed state to an open state in response to a pressure drop across the pressure relief valve (27) in the direction of the arrow A exceeding a predefined pressure drop value. The vacuum creating device (14) is operable in response to a signal from a pressure sensor (10) detecting pressure in the cavity (5) exceeding a predefined pressure value for applying a vacuum to the evacuating conduit (20) to increase the pressure drop across the pressure relief valve (27) to the predefined pressure drop value, for in turn operating the pressure relief valve (27) into the open state. On the pressure in the vessel (5) being reduced below the predefined pressure value, the vacuum creating device (14) is deactivated, and the pressure relief valve (27) transitions into the closed state, thereby preventing further leakage of insufflating gas though the Venturi vacuum creating device (14).

The invention discloses a full-premixing gas water heating equipment control method and device, equipment and a medium. When the current rotating speed of a fan reaches the maximum rotating speed of the fan and flame ion flow is smaller than or equal to a current threshold value, the pressure difference between the air pressure of a premixer and the gas pressure of the premixer is reduced, and a corrected pressure difference value is obtained; the opening degree of the gas proportional valve is adjusted, so that the pressure difference value between the air pressure and the gas pressure is equal to the corrected pressure difference value, and due to the fact that the corrected pressure difference value is smaller than the pressure difference value obtained through calculation based on the current rotating speed of the draught fan, when the air pressure is reduced, the pressure difference value is also reduced, and the gas pressure needing to be reduced is reduced; the reduction range of the opening degree of the gas proportional valve is reduced, the problem that smoke exceeds the standard or flames out due to excessive reduction of the opening degree of the gas proportional valve is avoided, and the environment-friendly performance and the operation stability of the full-premixing gas water heating equipment are improved.

A partition wall for dividing an aircraft cabin into individual sections, having at least one opaque air passage for enabling a pressure reduction between the sections through the partition wall. The wall also includes a frame and at least one stress-free planar element which is inserted into the frame. The at least one air passage is formed by a structure, a suspension in the frame, or both.

This invention relates to a drive system for a vehicle, the vehicle being at least partially powered by hydrogen (H2), the drive system comprising: a storage tank (1) for liquid hydrogen (H2) having a tank heating device (6); and an operation and consumption prediction module (10) configured to determine the amount of hydrogen (H2) required to reach a driving destination. vor ); and a control unit (12) for the tank heating device (6). The drive system of the present invention is characterized by having a pressure prediction module (11) configured to determine the desired target pressure (p) in the tank (1) to be reached upon arrival at the destination. End The required amount of hydrogen (H2) consumed (consumption) ges ), wherein the control unit (12) is configured to input the demand (consumption) vor ) and consumption (consumption) ges The two are compared with each other, and the consumption (consumption) is recorded. ges ) is greater than or equal to the demand (consumption) vor In the event of a shortage of water, the tank heating device is shut down (6), while the demand (consumption) is reduced. vor ) greater than the consumption (consumption) ges In the event of [a situation where] the tank heating device (6) is activated. Furthermore, the present invention relates to a method for controlling the consumption (consumption) in a pressure prediction module (11). ges This method performs model-based calculations. The drive system can be applied to vehicles.

The invention provides a work machine with improved convenience. An air compressor (10) is provided with a tank section (20), a compression section (40), and a control section (100). The tank part (20) stores compressed air. The compression unit (40) delivers compressed air to the tank unit (20). The control unit (100) includes a pressure sensor (108) that detects the pressure inside the tank unit (20). The control unit (100) is capable of executing a compression unit diagnostic control for diagnosing whether or not maintenance of the compression unit (40) is necessary on the basis of the driving time of the compression unit (40) and the pressure of the tank unit (20), and a tank unit diagnostic control for diagnosing whether or not maintenance of the compression unit (40) is necessary. The tank diagnosis control diagnoses whether or not maintenance of the tank (20) is necessary on the basis of the elapsed time from the point in time at which driving of the compression unit (40) is stopped and the amount of pressure reduction of the tank (20).

The invention relates to a brake system, comprising at least two wheel brake cylinders (RZ1-4), at least one electrically driven pressure supply (DV), at least one liquid storage tank (VB), at least one electronically controlled regulating device (ECU), at least two switching valves (SVi = 1-4), each of the at least two wheel brake cylinders (RZ1-4) is part of a separate wheel circuit (RK1-4), and the electrically driven pressure supply (DV) is at least used for establishing a pressure increase (Pauf) and a pressure decrease (Pab) in the wheel brake cylinders (RZ1-4), each wheel brake cylinder (RZ1-4) being connected to a switching valve (SVi = 1-4) via a respective hydraulic connection line. The switching valve (SVi = 1-4) is used for disconnecting and connecting the hydraulic connection of the corresponding wheel brake cylinder (RZ1-4) to at least one further hydraulic main line, the switching valve (SVi = 1-4) is connected or can be connected to at least the pressure supply (DV) via the at least one further hydraulic main line, and the switching valve (SVi = 1-4) is a normally open two-position two-way valve, according to the invention, at least the hydraulic connection line (HLRK1-4) and the wheel brake cylinder (RZ1-4) connected to the hydraulic connection line (HLRK1-4) are parts of a wheel circuit (RK1-4), and at least one switching valve (SVi = 1-4) or all switching valves (SVi = 1-4) do not have a check valve or do not have a check valve connected in parallel with the switching valve (SVi = 1-4), providing various measures alone or in combination, the switching valve (SVi = 1-4) is prevented from being closed when the pressure (Pab) is reduced through the switching valve (SVi = 1-4).

[Problem] To provide a lift generating device for an aircraft and a thrust generating device for an aircraft that are capable of generating lift and thrust, respectively, using dynamic pressure which is generated when a disc member is rotated. [Solution] A lift generating device (10) for an aircraft comprises: a circular or annular disc member (11); a rotational drive mechanism (12) that rotationally drives a disc member (11); a lift generating mechanism (13) that generates lift (F) with dynamic pressure which is generated in the vicinity of an upper surface of the disc member (11) when the disc member (11) is rotationally driven; an annular pressure reduction chamber (14) that is formed by the disc member (11) and a disc body (6) in a region in the vicinity of a lower surface of the disc member (11); a plurality of sealing means (15A, 15B) that seal the pressure reduction chamber (14) such that air does not enter therein; a vacuum pump (16) that is capable of reducing the pressure inside the pressure reduction chamber (14) to a preset reduced-pressure state; and a plurality of thrust bearing means (17) that are provided inside the pressure reduction chamber (14) and between the disc member (11) and the disc body (6).

This utility model relates to the field of seat cushion technology and discloses a slow-rebound spring breathable seat cushion, including a base, a flexible pad on the top of the base, a fitting groove at the top of the base, and several ventilation grooves at the bottom of the base. Several first mounting grooves are formed on the inner wall of the fitting grooves, and a fixing cylinder is fixedly installed on the inner wall of each of the first mounting grooves. When a person sits on the flexible pad, the pressure causes the sleeve and piston rod to move downwards. Part of the pressure is discharged to the outside through the ventilation grooves, and part flows into the ventilation holes through the connecting holes to reduce the stuffiness near the flexible pad and achieve breathability. At the same time, the spring is compressed and stores energy, which can disperse the pressure. After the pressure decreases, the spring releases energy and resets, and the piston rod simultaneously resets upwards. The space inside the fixing cylinder expands to form a negative pressure, and outside air enters through the ventilation grooves at the bottom of the base and is drawn in through the through holes of the fixing cylinder to replenish it. Finally, the flexible pad returns to its initial shape, achieving a slow-rebound effect and avoiding instantaneous bounce.

The utility model provides a kind of hydraulic damping device of anti-leakage, including main cylinder body and the main piston of sliding installation in the main cylinder body, the main piston separates the inner cavity of the main cylinder body into first cavity and second cavity, pressure reducing valve is installed in the first cavity, the pressure reducing valve includes the pressure reducing cylinder body being placed in the first cavity and the pressure reducing piston of sliding installation in the pressure reducing cylinder body, one end of the pressure reducing cylinder body is provided with pressure reducing hole, the inner cavity of the pressure reducing cylinder body is communicated with the first cavity by the pressure reducing hole, the pressure reducing piston is used to open and close the pressure reducing hole;When the pressure in the first cavity is too large, hydraulic oil will push away the pressure reducing piston and enter the pressure reducing cylinder body by the pressure reducing hole, so that the pressure of the first cavity is reduced;A kind of hydraulic damping device of anti-leakage provided by the utility model overcomes the defect that existing hydraulic damping device is prone to oil leakage.

A fine bubble generating nozzle may include a nozzle unit and a baffle. The nozzle unit may include: an inlet; a pressure decreasing portion configured to decrease a pressure of a gas-dissolved pressurized water introduced from the inlet; a first collision chamber disposed downstream of the pressure decreasing portion and including a first collision wall with which the gas-dissolved pressurized water introduced from the pressure decreasing portion collides so that a flow direction of the gas-dissolved pressurized water changes; a second collision chamber disposed downstream of the first collision chamber and including a second collision wall with which the gas-dissolved pressurized water having flowed through the first collision chamber collides so that the flow direction of the gas-dissolved pressurized water changes; and an outlet. The baffle may be disposed outside of the nozzle unit and is disposed at a position facing the outlet.

To provide a tire pressure reduction detection system, a tire pressure reduction detection method, and a program that can suppress the decrease in accuracy of pressure reduction detection of pneumatic tires caused by changes in the type of pneumatic tire. [Solution] The tire pressure reduction determination system comprises: a first acquisition processing unit 51A that acquires the rotational speed of a tire mounted on a vehicle 1A; a second acquisition processing unit 54A that acquires the resonant frequency of the tire based on the acquired rotational speed; a replacement determination processing unit 58A that determines whether the difference between the acquired resonant frequency and a reference frequency exceeds a first determination value; and a change processing unit 59 that changes a threshold used in the pressure reduction determination process that determines whether the tire is depressurized or not when it is determined that the difference between the resonant frequency and the reference frequency exceeds the first determination value.

The application relates to a stable pressure relief self-resetting pressure relief structure arranged on a shell, which comprises a front cover, a movable piece and an elastic element, the front cover is fixedly installed on the shell, a sliding hole is arranged on the front cover, the movable piece penetrates through the sliding hole and can slide along the axial direction of the movable piece, the size of the two ends of the movable piece is larger than the radial size of the sliding hole, the elastic element is arranged along the axial direction of the movable piece, one end of the elastic element is in abutting fit with the front cover, the other end of the elastic element is in abutting fit with one end of the movable piece, the elastic element is linked with the movable piece, the front cover is further provided with an exhaust hole and a pressure relief hole which are in communication with the inside and outside of the shell, when the movable piece is in a natural state, one end of the movable piece closes the pressure relief hole, when the movable piece moves axially, the pressure relief hole is opened. The application can automatically relieve pressure when the pressure is high, can automatically reset when the pressure is reduced, can keep a relatively stable pressure state in the shell, has high reliability, good stability and is not prone to failure.

The utility model discloses a fixture for gluing a mask substrate, and belongs to the field of mask plate gluing. The fixture for gluing the mask substrate comprises a base with a placement groove, first sealing rings are arranged at the four corners in the placement groove in a surrounding mode, supporting columns are arranged in the middles of the interiors of the four first sealing rings, first air exhaust cavities are formed in the supporting columns, and communicating cavities are formed in the base in a surrounding mode. The fixture solves the problem that the lower end of a whole mask substrate of an existing fixture is uniformly adsorbed by one sealing ring, the error-tolerant rate is poor, the interior of the containing groove is divided into four areas, the four areas conduct independent adsorption and assist with one another, the pressure of the adsorption position is continuously detected through the pressure sensor in the adsorption process, and the adsorption efficiency is improved. And after the pressure is reduced, the piston head at the lower end of the second sealing ring longitudinally slides to provide additional adsorption force for adsorption.

An aspiration device (110) for measuring the viscoelastic deformability of biological tissues and synthetic materials comprises a probe head (11), a probe channel (41), a pressure unit (20), a pressure sensor (31) and a control unit (60). The first probe channel (41) is connecting the pressure unit (20) providing a vacuum with the probe head and includes the pressure sensor (31) detecting the pressure in the first probe channel (41). The first probe channel (41) has a distal end (141) leading with its lower open end (144) through the top wall (14) into the cavity (15) of the probe head. The cavity (15) comprises either an opening (16) in the side or top wall (13, 14) or a second probe channel connected with a valve. A measurement cycle comprises applying under pressure in the first probe channel (41), measuring the under pressure with the pressure sensor (31), detecting a change of under pressure increase over time (301, 401), increasing the under pressure to a predetermined maximum under pressure (303), decreasing the under pressure beyond this point in time and detecting a change of under pressure decrease over time (302, 402).

The application discloses a pressure gauge calibration device, which comprises a base and a pressure regulating cylinder. A sliding seal is arranged in the pressure regulating cylinder, and a piston is matched with the sliding seal. A driving assembly is arranged on the pressure regulating cylinder. An installation part is arranged on the base, and a pressure relief valve is arranged on the installation part. A pressure increasing assembly, a pressure decreasing assembly and an adjusting assembly are arranged on the pressure regulating cylinder. In the pressure increasing state, the back-and-forth movement of the piston in the pressure regulating cylinder can compress the gas in the gas compression space and press the gas into the installation part to increase the internal pressure of the installation part, and at the same time, the external gas can be sucked into the gas expansion space. In the pressure decreasing state, the back-and-forth movement of the piston in the pressure regulating cylinder can suck the gas in the installation part into the gas expansion space to decrease the internal pressure of the installation part, and at the same time, the gas in the gas compression space can be discharged. The application aims at solving the technical problem of complicated operation of the existing equipment.

This diagnosis method comprises: a step of measuring a surface pressure range with respect to a gasket using three-dimensional point cloud data of a flange surface; a step of comparing the surface pressure ranges before and after deterioration to calculate any one or two or more of a surface pressure decrease amount, a surface pressure decrease width, a surface pressure decrease rate, and a surface pressure decrease speed; a step of selecting, from a database storing any one or two or more of flange repair content, repair timing, and repair cost related to any one or two or more of the surface pressure decrease amount, the surface pressure decrease width, the surface pressure decrease rate, and the surface pressure decrease speed, any one or two or more of the repair content, repair timing, and repair cost identified by any one or two or more of the surface pressure decrease amount, the surface pressure decrease width, the surface pressure decrease rate, and the surface pressure decrease speed; and a step of presenting a diagnosis result including any one or two or more of the repair content, repair timing, and repair cost. Thus, maintenance information including any one or two or more of repair content, repair timing, and repair cost is presented through digitization of each surface pressure range before and after deterioration.

Method for operating a laser processing machine (10) in which an inlet pressure of a process gas (30) at an inlet (60) of a pressure control valve (58) of the laser processing machine (10) is determined by adding a pressure reduction and an outlet pressure measured at an outlet (62) of the pressure control valve (58).

To suppress the occurrence of cavitation. [Solution] The control system for the work machine comprises a hydraulic pump that discharges hydraulic fluid, a meter-in valve that adjusts the hydraulic fluid discharged from the hydraulic pump, a hydraulic actuator to which the hydraulic fluid adjusted by the meter-in valve is supplied via a meter-in passage, and a controller. The controller acquires the supply flow rate, which indicates the flow rate of hydraulic fluid supplied to the hydraulic actuator, and if it determines that a pressure decrease state is occurring where the pressure in the meter-in passage decreases, it calculates a compensation flow rate to be added to the supply flow rate in order to suppress the pressure decrease in the meter-in passage, and controls at least one of the opening area of ​​the meter-in valve and the hydraulic pump based on the supply flow rate and the compensation flow rate.

The present invention relates to a method and a product forming unit (11) for dry manufacturing rigid cellulose product (2) having essentially non-flat general shape from a cellulose blank (10). The product forming unit (11) comprises a moulding tool having a first mould part (15) and a second mould part (16), and the method comprising the steps of providing the cellulose blank (10) into the moulding tool, closing the moulding tool, pressing the heated cellulose blank (10) between the first mould part (15) and the second mould part (16) of the moulding tool, by applying a forming pressure P in the axial direction of the moulding tool, performing a first step of the opening of the moulding tool by decreasing the applied pressure down to a predetermined pressure level P1 in the range 25 - 15 % of said forming pressure P, performing a second step of the opening of the moulding tool be decreasing the applied pressure from said predetermined pressure level P1 down to at least 5% of the forming pressure P during a time period equal to or more than 0,1 seconds and equal to or less than 2 seconds, performing a third step of the opening of the moulding tool by displacing at least one of the first mould part (15) and the second mould part (16) in the axial direction in relation to each other, away from each other to the open position, and removing the cellulose product (2) from the moulding tool. Publication picture: Figure 8

This invention belongs to the field of parts cleaning technology, specifically a method and apparatus for cleaning deep blind hole parts. The method includes the following steps: S1, placing the deep blind hole part into a cleaning chamber and sealing the chamber; S2, evacuating the cleaning chamber; S3, injecting cleaning fluid into the cleaning chamber; S4, increasing the internal pressure of the cleaning chamber to a first pressure; S5, controlling the internal pressure of the cleaning chamber to cycle periodically, each cycle including a first pressure maintenance period, a pressure decrease period, a second pressure maintenance period, and a pressure increase period; during the first pressure maintenance period, an ultrasonic transmitting mechanism sends high-frequency ultrasonic waves with alternating frequencies to the cleaning fluid; during the latter half of the pressure decrease period, the ultrasonic transmitting mechanism emits low-frequency ultrasonic waves. This invention enables the active removal of impurities, preventing detached impurities from remaining in the deep blind hole and re-adhering to the hole wall, thus improving the cleaning effect.

The embodiment of the present application provides a kind of air pressure stabilizing device, air pressure control method and computer program product.In the design of air pressure stabilizing device, by the gas buffer tank of air pressure stabilizing device is designed into variable volume air cavity, so that the gas buffer tank can be based on current pressure value dynamic adjustment volume, when the pressure in gas buffer tank rises, the volume of gas buffer tank can be increased, so that the influence of pressure rise can be reduced.On the contrary, when the pressure in gas buffer tank reduces, the volume of gas buffer tank can be reduced, and the pressure of gas buffer tank is supplemented, so that the pressure value of the gas output to the gas end by gas buffer tank is stabilized around the target pressure value, and there is no sharp fluctuation, and then the control precision of air pressure stabilizing device can be improved, so that in low pressure control scene, accurate pressure control can also be realized.

The invention is suitable for the technical field of oxygen cabin pressure control, and provides a micro-pressure oxygen cabin pressure increasing and decreasing control algorithm, which comprises the following steps: S1, manually setting a constant pressure increasing and decreasing speed, and starting or closing a blast pump and an oxygen generator program; s3, after the pressure is collected within the collection period time, calculating a pressure rising or falling average value; s4, adjusting the opening degree of the exhaust valve according to the collection periods of different times; s5, the target pressure in the micro-pressure oxygen cabin is set, so that the pressure in the micro-pressure oxygen cabin reaches the target pressure, in this way, in the pressure boosting stage of the micro-pressure oxygen cabin, air inflow attenuation is compensated by dynamically closing the exhaust valve down, and in the pressure reducing stage, exhaust efficiency attenuation is compensated by dynamically opening the exhaust valve up; the cabin pressure change rate is stabilized at an ear pressure sensitive critical value set by a user in the whole process; meanwhile, the feedback coefficient, the feed-forward coefficient and the initial opening degree are automatically optimized according to the whole-course speed after each treatment course, so that personalized optimal control is achieved after the equipment is used for multiple times.

The invention belongs to the technical field of vehicle braking, and particularly relates to an electronic hydraulic braking system with self-locking and pressure balancing functions. The system comprises a brake master cylinder unit, a pressure buildup unit, a hydraulic control unit, four brake wheel cylinder units and an ECU (electronic control unit), and the pressure buildup unit comprises a worm and gear reducing mechanism, an auxiliary motor and a gear and rack pushing and pressing mechanism. The hydraulic control unit comprises a first isolation valve, a second isolation valve, a first pressure increasing valve, a second pressure increasing valve, a third pressure increasing valve, a fourth pressure increasing valve, a first pressure reducing valve, a second pressure reducing valve, a third pressure reducing valve, a fourth pressure reducing valve, a first balance valve, a second balance valve, an oil storage pot and a pressure sensor. The brake wheel cylinder unit comprises a left front wheel cylinder, a right rear wheel cylinder, a right front wheel cylinder and a left rear wheel cylinder. According to the method, a hydraulic pressure adjusting algorithm for a control system is established, so that stable pressure output and double-wheel balanced braking can be kept under normal braking, abnormal working conditions and environment disturbance conditions.