91results about How to "Low control pressure" patented technology

The invention discloses a wind tunnel operation control system based on a distributed architecture, which belongs to the technical field of aerospace ground thermal insulation tests, so as to controleach part in a combustion-gas flow thermal wind tunnel test system to realize thermal examination on a spacecraft thermal protection structure. The distributed control architecture is used, each control subsystem of the wind tunnel has an independent controller, operation control is carried out on a corresponding device, coordination of the whole action is realized through a top-layer master control command and dispatch subsystem, the whole wind tunnel system is ensured to act in a coordinated and orderly mode, software and hardware supports are provided for stable operation of the wind tunnelsystem, and a technical support is provided for condition monitoring and timing control on the equipment.

The invention discloses a control method, device and TCU for synchronizer pre-engagement under the sliding and downshift working condition. The method comprises the steps that when the rotational speed difference of a power transmission shaft and a non power transmission shaft is larger than or equal to a first threshold value, a clutch corresponding to the power transmission shaft separates from a first set quantity, a clutch corresponding to the non power transmission shaft is combined with a second set quantity, and meanwhile an engine is requested to increase the rotational speed value to the first rotational speed to adjust the rotational speed of the non power transmission shaft, wherein values of the first set quantity and the second set quantity are negatively correlated with the rotational speed change rate of the power transmission shaft; when the adjusted rotational speed difference is smaller than a second threshold value, the engine is requested to stop increasing the rotational speed, the clutch corresponding to the power transmission shaft is combine with the first set quantity, and the control pressure of the clutch corresponding to the non power transmission shaft is reduced till the clutch is fully opened; and when the control pressure of the clutch corresponding to the non power transmission shaft is smaller than a third threshold value, a synchronizer moves up a gear, therefore production of gear moving noise is avoided, and DCT fuel consumption is reduced.

A hydraulic system includes an engine driven adjustable hydraulic pump which supplies fluid to a hydraulic consumer, and an electronic control unit. The adjustable pump includes flow controller for controlling a pressure difference between the consumer and the adjustable pump to a pre-determined control pressure difference. The flow controller includes an actuator controlled by the control unit, through which the pressure difference can be controlled. The electronic control unit receives an engine speed signal and controls the actuator to control the pressure difference, in order to make power delivery of the adjustable pump conform to the operating conditions of a vehicle.

A control apparatus of a vehicle transmission includes a hydraulic circuit configured to activate at least one friction element with a control pressure, a selector configured to select a range of the transmission, a valve configured to switch a transmission shifter, and a control unit configured to direct the valve to switch the transmission shifter in response to the selected transmission range and to reduce the control pressure prior to switching the transmission shifter. A method to control a vehicle transmission includes activating at least one friction element with a control pressure, selecting a desired range of the transmission, switching a transmission range in response to the selected desired transmission range, and reducing the control pressure prior to switching the transmission range.

The plate shape and thickness-controlling rolling method is to use "move work roll" roller mill, where the gap is changed to regulate the plate shape and thickness via transversely shifting and symmetrizing crossed work rolls. The roller mill includes frame, hold down mechanism, upper support roll mechanism, upper work roll mechanism, lower support roll mechanism, lower work roll mechanism, and cross shift mechanism comprising waist block and shift cylinder. The cross shift mechanism is used to replace available expensive automatic thickness controller and results in simple roller mill structure, low cost, low pressure for plate shape and thickness control and raised control precision. In addition, using the hold down cylinder, the waist block and the shift cylinder can realize gap-less rolling.

The invention provides a bi-directional rotary pump, which can form large flow when controlling flow, and can reduce load torque exerting on the electric engine when controlling pressure, making the electric engine miniaturization and with higher efficiency than the existing bi-directional rotary pump. The volume-variable bi-directional rotary pump includes a bi-directional rotary pump mechanism, a volume-variable mechanism for carrying out mechanical modification based on the increase and decrease of the control pressure acting on the press part, which causes the discharge volume for rotating per unit of the pump mechanism to change; a change-over valve, forming the first loop connection for reducing said control pressure, connecting the press part with low press side loop, when making the volume-variable mechanism modify to the large volume, at the same time the second loop connection is formed for guiding the discharge pressure of said pump mechanism itself as control pressure, when making the volume-variable mechanism modify to the small volume.

The invention discloses an adjusting device used for adjusting discharge volume of the fluid static force pump and provided with a power adjusting valve. The power adjusting valve is provided with a first port, a second port, a third port and a valve slide block. Hydraulic pressure oil can flow into the first port from a pressure port of the pump. The second port can be connected with an oil tank. The third port is connected with a servo cavity in a servo piston. The valve slide block can be loaded through controlling pressure in a condition when the discharge volume of the pump is decreased and the valve slide block can be loaded with a spring device in a condition that a swing angle is increased. The invention aim at adjusting different power levels by arranging the adjusting device adopting the above structure. The device is realized by that the valve device can load control pressure that is amount to pressure in a pressure port of the pump or can load control pressure decreasing relative to pressure in the pressure port of the pump based on adjustment of the valve slide block of the power adjusting valve.

The invention relates to an intelligent electric actuator based on CAN bus communication, belonging to the field of control technology for airplane moles and anthropomorphic robots. The intelligent electric actuator comprises a signal demodulation circuit, a motor driving integrated circuit and a DC motor, which are successively connected, the output shaft of the DC motor is connected with a reduction gear unit, the output shaft of the reduction gear unit is coaxially connected with a potentiometer. The intelligent electric actuator comprises a micro-control chip and a CAN bus driver. The micro-control chip is connected with a host computer through the CAN bus driver and a CAN bus, receives the control commands of the host computer, generates PWM signals and transmits the signals to the signal demodulation circuit. The potentiometer is connected with the micro-control chip 26 which collects the position signals of the potentiometer, and transmits the position signals to the host computer. The intelligent electric actuator has small volume, high reliability, low power consumption and high intelligence, is suitable for composing distributed control systems, greatly lowers the control pressure of a host control machine, and reduces the leas number of the host control machine.

The embodiment of the invention discloses a control system and a control method for dynamic splicing wall display, which are used for improving the fault tolerance of control systems, and are simple and flexible to operate. The control system disclosed by the embodiment of the invention comprises a splicing wall control device and a splicing wall display device, wherein the splicing wall display device comprises a master display unit and at least one slave display unit, the splicing wall control device is connected with the master display unit of the splicing wall display device, and the master display unit is connected with all the slave display units. When the master display unit has a fault, the splicing wall control device is switched and connected to any slave display unit, then the master display unit is converted into a slave display unit, and the slave display unit connected with the splicing wall control device is converted into a master display unit.

A new high-strength titanium-based alloy bucket specifically suited for use as the last stage buckets in steam turbine engines having vane lengths of about 40 inches or greater and the method for forming such bucket. Exemplary buckets according to the invention are formed from a titanium-based alloy containing up to about 6.25% aluminum; (b) about to 3.5% vanadium; (c) about 2.25% tin, (d) about 2.25% zirconium, (e) about 1.75% molybdenum, (f) about 2.25% chromium, (g) about 0.7% silicon; and (h) about 2.3% iron, with the balance being titanium. After forming, the bucket can be heat treated to provide stress relief and then machined in a conventional manner.

A control apparatus for a power transmission system is provided. The control apparatus includes an electronic control unit. The electronic control unit is configured to, when a discharge flow rate of a mechanical oil pump is smaller than a predetermined flow rate and an electric oil pump is being driven while a vehicle is traveling, determine whether a decrease in the operating hydraulic pressure has occurred. The electronic control unit is configured to, when a first engagement device is controlled from a released state toward an engaged state, control a first control pressure such that the first control pressure in a case where a decrease in a operating hydraulic pressure has occurred is lower than the first control pressure in a case where a decrease in the operating hydraulic pressure does not occur.

The invention discloses a hydraulic valve arrangement, especially a regulating valve arrangement of a hydraulic machine whcihi s particularly a hydraulic pump. The valve arrangement has at least one valve. A valve body of the valve is penetrated by a pressure medium passage which has a minimum cross section, and, thus in normal operation, controls pressure downstream of the minimum cross section with a pressure acting at a pressure port of the valve. The minimum cross section is arranged close to a pressure medium passage mouth which is arranged upstream or is configured to be subjected to the high pressure. Additionally, a hydraulic machine arrangement, in particular a pump arrangement, includes the hydraulic valve arrangement.

The invention supplies a liquid feeding valve that includes case body and valve body. Low-pressure oil mouth on the case body is connected to the valve body. And control piston, spring, main valve core, and precursor are set in the valve body. The oil drain is set on the main valve core; the oil way is set on the valve body. The feature is that pulling bar is set between the man valve core and the control piston. The spring is enlaced on the bulling bar. A clearance is set between the pulling bar and the main valve core. A precursor valve bar is set on the precursor valve core on the bottom of the main valve core. And the precursor valve bar is fixed through the main valve core and the pulling bar. The clearance between the pulling bar and the main valve core is 2-5mm. The precursor valve fixed to pulling bar by precursor valve fixing nut.

The hydraulic control valve device (1) has a throttling control valve (2), which is arranged in an intermediate position with a conveying line (3) and a pump (4), where an outlet side fitting tight counter-balance valve (15a) is arranged in the direction of a flow position (18a) for being operated with a control pressure (pA) of the control valve. Multiple throttle units (21a,21b,23a,23b) are formed as diaphragms or nozzles.

The invention discloses a double-gain clutch control system of automobiles, which comprises a main pressure source, a variable electromagnetic valve, a clutch regulating valve, a gain control device and a cutch. The clutch is provided with a pressure oil chamber which is connected to the regulating valve oil outlet of the clutch regulating valve through a clutch pressure oil passage; the clutch regulating valve is connected to the main pressure source through an oil-supply oil passage; the gain control device comprises a pressure increasing valve, a trigger pressure oil passage, a clutch control oil passage, a gain control oil passage and an oil outlet, is connected to the clutch regulating valve through the clutch control oil passage and the gain control oil passage and controls the gain of a clutch control pressure according to the signals of the trigger pressure oil passage so that the clutch has a high gain for a high torque and has a low gain for a low torque. Therefore, the automatic gearbox has a high torque range at a low speed and has a better gear-shifting quality at a high speed.

The invention discloses a power grid linkage type stable sectional power flow control method and a server. The power flow control method comprises the following steps of judging whether each stable section is out of limit or not according to power flow and a control zone of each stable section in a power grid linkage type stable sectional set; adjusting the output of a correlated control machine set so as to carry out upper limit control on the stable section exceeding an upper limit in the linkage type stable sectional set according to adjusted associated information between an upper-stage stable section and a lower-stage stable section in the linkage type stable sectional set when the stable section exceeds the upper limit; adjusting the output of the correlated control machine set so as to carry out lower limit control on the stable section exceeding a lower limit in the linkage type stable sectional set according to the adjusted associated information between the upper-stage stable section and the lower-stage stable section in the linkage type stable sectional set when the stable section exceeds the lower limit; and counting total adjustment quantity of all participated linkage type stable sectional power flow control machine sets, and updating the control adjustment quantity of an automatic generation control (AGC) region.

Partially degradable stents formed of electrospun polymeric fibers have been developed. The lumen of the stent enlarges as the degradable polymeric inner luminal wall of the stents degrades over. When inserted in the eye of a subject connecting anterior chamber to the subconjunctival space, the stents allows for controlled outflow of aqueous humor, providing controlled of the rate of change in the intraocular pressure (TOP) and sustained decrease of TOP to treat eye disorders such as glaucoma. Methods of making these fibers via electrospinning and heat processing, as well as their uses in medical applications, are also provided.