109results about How to "Solve out of control" patented technology

The invention discloses a device and method for inductive current sampling of a bridge-free PFC circuit. The device comprises a first sampling unit, a second sampling unit and a third sampling unit. The device for inductive current sampling of the bridge-free PFC circuit is connected with the bridge-free PFC circuit. The first sampling unit is in series connection with a first switch tube of the bridge-free PFC circuit and is used for sampling a current passing through the first switch tube and obtaining first sampling signals V1; the second sampling unit is in series connection with a second switch tube of the bridge-free PFC circuit and is used for sampling a current passing through the second switch tube and obtaining second sampling signals V2; one end of the third sampling unit is connected with the grounding end of the bridge-free PFC circuit, the other end of the third sampling unit is connected with the negative output end of an PFC capacitor of the bridge-free PFC circuit, and the third sampling unit is used for sampling a current passing through a booster diode of the bridge-free PFC circuit and obtaining third sampling signals V3.

The high vacuum heat insulating low temperature liquefied gas storing tank includes frame and tank body. The tank body consists of outer casing, inner container and combined support structures connecting the outer casing and the inner container. The combined support structures are set between the inner sealing head and outer sealing head on two ends of the tank to bear the radial load and the axial load with great bearing force. The heat conducting area between the inner container and the outer casing is small, and the inner container has great effective loading volume.

Disclosed are a smart control system, method, and air conditioner. The system comprises: a first collection module (110) for collecting user gestures to obtain a first gesture signal; a first recognition module (120) connecting to the first collection module (110) and for determining the first air conditioner control command corresponding to the first gesture signal; a first control module (130) connecting to the first recognition module (120) and for controlling the air conditioner according to the first control command; the first collection module (110) comprises: a near electric field sensor unit (111) for collecting user gesture information to obtain a first gesture signal. The present invention controls an air conditioner via gestures so as to solve the problem of inconvenient air conditioner controlling via remote controls. By using a near electric field sensor, a user can accurately control the air conditioner.

The invention relates to an autonomous navigation system and method of an unmanned aerial vehicle based on an electric field equipotential surface of a super-high voltage line area. The navigation system comprises an unmanned aerial vehicle body, an electromagnetic field measuring module, a flight control subsystem and an inertial navigation subsystem. When the system works, the unmanned aerial vehicle flies to the original position, and the electromagnetic field measuring module acquires an initial electric field value; the inertial navigation subsystem plans the flight path of the unmanned aerial vehicle according to the contour value diagram of the electric field distribution; during the flying process, the electromagnetic field measuring module acquires the electric field value of thecurrent position; the airborne processing module in the flight control subsystem judges the difference between the set fluctuation threshold value and the initial electric field value according to theflight condition, and sends an instruction to the flight control module to adjust the flying height and the direction of the unmanned aerial vehicle; based on the flight path, the unmanned aerial vehicle flies in depth along a contour of a certain equipotential surface. The system solves the problem of runaway of the unmanned aerial vehicle caused by the strong electromagnetic field, and has theadvantages of autonomous navigation under the environment of super-high voltage transmission lines, stable navigation, accurate navigation and the like.

The invention relates to a control method for guaranteeing the safe operation of a wind turbine. The method comprises the following steps of: (1) generating pulse signals by a master control system in real time and sending the signals to a pulse detector; (2) detecting the pulse signals sent by the master control system by the pulse detector in real time, and executing a step (3) when a detection result of the pulse detector has an abnormality, or else circularly executing the step (1) and the step (2); (3) outputting contact signals to a safety system by the pulse detector; (4) disconnecting a safety chain after the safety system detects the contact signals and sending a control command to a variable pitch system; and (5) controlling the wind turbine to be shut down by the variable pitch system after receiving the control command. The method has reasonable design, judges whether the master control system has a failure or not through detecting the pulse signals of the master control system in real time and can control the wind turbine to be safely shut down in real time after the failure occurs, thereby effectively protecting the wind turbine equipment and guaranteeing the safety operation of the wind turbine.

The invention provides a smart home control system and method, and relates to the technical field of equipment networking control. The method comprises the following steps that: gateway equipment detects a heartbeat packet in a network in real time: if the heartbeat packet is detected, the gateway equipment establishes communication connection with a cloud platform, receives a control instructionsent by the cloud platform so as to control each terminal equipment, and receives a query instruction sent by the cloud platform so as to obtain real-time state information of each terminal equipment;if the heartbeat packet is not detected, the gateway equipment counts the duration of not detecting the heartbeat packet, compares the duration with a preset duration threshold value; and if the duration is not less than the duration threshold, the gateway device establishes a communication connection with the local host, receives a control instruction sent by the local host to control each terminal device, and receives a query instruction sent by the local host to obtain real-time state information of each terminal device. According to the invention, the problem that the smart home cannot becontrolled and queried under the condition of network disconnection is effectively solved, and the user experience is improved.

The invention discloses a controller, a method, and a system for vehicle collision protection and a vehicle. The controller includes a receiving module, which is used for receiving a collision signal and a vehicle speed signal; a control module, which is used for triggering an ESP (electronic stability program) control unit to execute a brake operation when the receiving module receives the collision signal; the control module is further used for triggering an electronic hand brake to execute the brake operation when the vehicle speed value expressed by the vehicle speed signal is less than the first preset vehicle speed threshold value after triggering the ESP control unit to execute the brake operation. Thus the vehicle slows down and stability during the vehicle braking process is kept; besides, the vehicle out-of-control problem after the collision is solved, and the secondary accident and the accident extension are effectively prevented.

The present invention relates to the field of smart home and discloses a control method of a smart home system, aiming to solve the control problem of the smart home system under the condition of network outage. A home gateway and a wide area network maintain the connection heartbeat, when the heartbeat breaks a certain time, whether the network outage occurs is determined, if yes, the control command send by a control end passes through the local area network and reaches the Internet of Things device through the home gateway, the data information of the Internet of Things device passes through the home gateway and reaches the control end through the local area network; if the network outage doesn't occur, the control command sent by the control end reaches the Internet of Things cloud platform via the wide area network and then passes through the wide area network and the home gateway to reach the Internet of Things device, the data reported by the Internet of Things device reaches the Internet of Things cloud platform via the home gateway and the wide area network, and then is transmitted to the control end via the wide area network. The control method is suitable for the smart home control under the condition of network outage.

The invention discloses a battery management system, a control device and a control method of a relay thereof. The control device of the relay of the battery management system comprises a first driving unit, a second driving unit, a main processor, and an auxiliary processor. The first driving unit is connected with a first end of a control coil of the relay. The second driving unit is connected with the second end of the control coil of the relay. The main processor is connected with the first driving unit, and is used to control the connection / disconnection of the first branch, and the first branch is the connecting branch between the first driving unit and the first end of the control coil. The auxiliary processor is connected with the second driving unit, and is used to control the connection / disconnection of the second branch, and the second branch is the connecting branch between the second driving unit and the second end of the control coil. The auxiliary processor is connected with the main processor by a communication bus. The problem of the incontrollable vehicles caused by the invalid control device of the high voltage relay of the prior art can be solved, and therefore the safety and the reliability of the battery management system can be improved.

The invention provides a transfusion system, which comprises a transfusion pump and a transfusion tube, and further comprises a liquor stopping device positioned downstream the transfusion pump, wherein the liquor stopping device provides prestress so as to be in a normally closed state of blocking the transfusion of the transfusion tube; and only when the transfusion tube normally works, a pressure provided by the transfusion tube is counterbalanced with the prestress, so that the liquor stopping device is in an open state of making the transfusion tube at work. The transfusion system can solve the problem of the uncontrollable liquor flow velocity of the transfusion pump in the prior art.

The invention relates to the technical field of collimating optical system of LED lighting, in particular to a turn-back type LED lighting optical system. The turn-back type LED lighting optical system comprises a free curved-surface lens and a free curved-surface reflector. The free curved-surface lens and the free curved-surface reflector are coaxial with the spacing ranging from 0.01m to 0.1m; the free curved-surface lens comprises a first curved surface, a second curved surface, a third curved surface, a fifth curved surface and a fourth curved surface, the first curved surface, the second curved surface and the fifth curved surface are rotationally symmetrical free curved surfaces, the third curved surface is a rotational paired paraboloid, and a focal point of the paraboloid is a virtual light point of reflected ray of the second curved surface, and the fourth curved surface is a cylindrical surface and used for connecting the third curved surface and the fifth curved surface. The free curved-surface reflector is composed of three curved surfaces. By the arrangement, optional viewing angles can be lit, and lighting effect of the optical system cannot be lowered due to total reflection.

The invention discloses a method and a device for performing weak magnetic control on a permanent-magnet brushless direct-current motor. The method comprises the following steps: acquiring the d-axis current and q-axis current of a permanent-magnet brushless direct-current motor, and calculating the actual voltage vector of the permanent-magnet brushless direct-current motor according to the d-axis current and the q-axis current; detecting the direct-current bus voltage, and acquiring a voltage vector circle according to the direct-current bus voltage; and performing closed-loop control according to the actual voltage vector and the voltage vector circle to calculate the weak magnetic current, and performing weak magnetic control on the permanent-magnet brushless direct-current motor according to the weak magnetic current, wherein weak magnetic control is effective when the absolute value of the actual voltage vector V1 is smaller than the quotient of the direct-current bus voltage Vdc and the square root of 3. By adopting the method, weak magnetic control can be stopped when the actual voltage vector of the motor is beyond the voltage vector circle, so that the problem of weak magnetic current out-of-control caused by weak magnetic current saturation is solved effectively.

The invention provides a temperature control method of a temperature changing subchamber, which comprises the following steps of: setting temperatures of a refrigerating chamber and a temperature changing subchamber; obtaining a refrigerating start temperature and a refrigerating suspension temperature of the temperature changing subchamber according to a temperature setting value of the refrigerating chamber, a temperature setting value of the temperature changing subchamber and a sectioning compensation temperature difference table; and detecting the current temperature of the temperature changing subchamber and controlling the refrigeration of the temperature changing subchamber according to the current temperature value, the refrigerating start temperature and the refrigerating suspension temperature. The invention carries out accurate control on the temperature of a temperature changing chamber by a principle of the temperature control sectioning compensation of the temperature changing chamber, thereby more favorably realizing all functions of freshness retaining, freezing point temperature and soft freezing of the temperature changing chamber.

The invention discloses a mini-type constant temperature and humidity control device and a temperature and humidity control method thereof. The mini-type constant temperature and humidity control device comprises a test cabin and a temperature and humidity control device. The temperature and humidity control device comprises a condensation water tank, a condensation heat exchanger, a semiconductor refrigeration piece, a semiconductor refrigeration cooler, a temperature rise heat exchanger, a fin type cooler, a heating device and an ultrasonic humidifier. The condensation water tank is arranged outside the test cabin. The condensation heat exchanger is arranged in the condensation water tank. The semiconductor refrigeration piece is arranged in the condensation water tank. The semiconductor refrigeration cooler is arranged on the outer side wall of the condensation water tank. The temperature rise heat exchanger is arranged on the rear portion of the semiconductor refrigeration cooler. The heating device and the fin type cooler are both arranged in the test cabin. The fin type cooler is connected with the condensation water tank through a circulation water pump and a connection pipeline so as to form a circulation water way. The test cabin forms a circulation gas way through a circulation gas pump and a connection pipeline. The circulation gas way sequentially passes through the circulation gas pump, the condensation heat exchanger, the temperature rise heat exchanger and the ultrasonic humidifier to enter the test cabin.

This invention relates to an adaptive complementary green illumination system, which collects solar rays for illumination controlled by a controller, when the sunshine exceeds a requirement of illumination, it will store the exceeded part to a storage cell via a solar energy battery, when it is lower than the that, the storage cell will drive a LED irradiance tube to makeup illumination, if the cell does not store enough electricity, then the commercial power will drive the LED. The base of a collecting mirror is connected with a tracer, and the solar rays received by the collecting mirror enter into a light splitter, one part of the output of the splitter enters into an astigmatic device via fibers, the other is sent to the solar energy cell, the output of which is connected with the cell, the LED driver and the LED illumination lamp orderly by the controller, the output of the commercial converter is connected with the LED driver and the LED illumination lamp orderly and the photosensitive tube on the tracer and that of the illumination in the test room are connected with the input of the controller and the control ends of the tracer, the splitter and the LED driver are connected with the output of the controller separately.

The present invention adopts single-order plus dead-time model; said upper computer controlling output panel control board key to make systems operation on ' identifying stage ', at this point, the relay identifying link switched into closed loop system; under action of relay link, after beginning systems operation, at short notice establishing limit loop; according to real-time measurement to relay output each parameter and biasing relay feed-back identifying formulae to calculate out system identifying three parameters: K, Theta and Pi, and storing in RAM. According to identified model parameter, system calculates each parameter of novel internal mold controller, computational result stored in RAM memory unit, the obtained model and internal mold controller parameter loading in each link in real production process. The present invention realizes the self calibration of digit internal mold controller, reducing hardware cost and raising systematical mobility, reliability and accuracy.

The invention discloses a multi-point combined accurate aeration control method, and belongs to technical field of automation process control. The method comprises: step 1, one biochemical tank is equipped with at least three groups of aerators, which are installed at front, middle and rear sections of the biochemical tank or installed in outer, middle and inner grooves according to a water inletdirection; step 2, a regulating valve is arranged at a total air inlet of each group of aerators; step 3, in the area of each group of aerators that are distributed in the biochemical tank, accordingto the technical requirement, a dissolved oxygen gauge is installed at a representative point; and step 4, a control apparatus is centrally arranged in a factory, through a necessary isolation or signal conversion device, a DO value y measured by the dissolved oxygen gauge, a regulating valve opening feedback value x and a regulating valve execution opening value i output by the control apparatusare connected, and a single dissolved oxygen zone control closed loop is formed. The method is good in control effect, saved in energy, and accurate in aeration.

The invention provides an intelligent switch controlled by sensing linkage. The intelligent switch comprises a main control module and a power source module, the intelligent switch further comprises an IO module, an NFC module, an infrared sensing module, an illumination detection module, a communication module, a relay module and an infrared transmitting module, the main control module is connected to the IO module, the NFC module, the infrared sensing module, the illumination detection module, the communication module, the relay module, the infrared transmitting module and the power source module separately, the IO module is connected to external sensing equipment, and the communication module, the relay module and the infrared transmitting module are all connected corresponding to home appliance equipment. The invention further provides a control method of the intelligent switch controlled by the sensing linkage. The intelligent switch controlled by sensing linkage is easy to operate, diverse in function and high in safety.

The invention discloses a secondary reheating set and an asynchronous control method for a reheating steam temperature of the secondary reheating set. The secondary reheating set comprises a combustor, a primary re-heater, a smoke baffle at the primary re-heater side, a secondary re-heater and a smoke baffle at the secondary re-heater side. The method comprises the following steps: measuring outlet steam temperatures of the primary re-heater and the secondary re-heater; simultaneously and respectively carrying out reversed adjustment on the smoke baffle at the primary re-heater side and the smoke baffle at the secondary re-heater side when the outlet steam temperatures of the re-heaters are abnormal and are not higher or lower at the same time; and simultaneously locking the smoke baffle at the primary re-heater side and the smoke baffle at the secondary re-heater side when the outlet steam temperatures of the primary re-heater and the secondary re-heater are higher or lower at the same time. According to the secondary reheating set and the asynchronous control method for the reheating steam temperature of the secondary reheating set, the problem that the smoke baffles can not be controlled when the outlet steam temperatures of the re-heaters are higher or lower at the same time is solved; the unbalance of the outlet steam temperatures of the primary re-heater and the secondary re-heater can be rapidly revised.

The invention, specific to the problem that a flue gas flow field in an absorption tower is nonuniform so that desulfurizing reaction efficiency is decreased, provides a dual-scale dynamic feedback homogenizing system for a flow field. The system comprises a horizontal dynamic rectification component, a longitudinal dynamic rectification component and a fixed diversion unit, wherein the horizontaldynamic rectification component and the longitudinal dynamic rectification component both comprise a flow field adjusting unit and a feedback control unit; the system is installed at an upstream flueof the inlet of the absorption tower, a longitudinal flow field adjusting unit is installed at an inlet segment, which is close to the adsorption tower, of a joining flue in front of the tower, a horizontal flow field adjusting unit is arranged at the upstream of the vertical flow field adjusting unit, and the fixed diversion unit is installed in a swerving flue in front of the tower; the flow field adjusting unit is provided with a blade group for adjusting a flow field, the feedback control unit is used for collecting flow field information at the downstream of the flow field adjusting unit, the angle of deflection of the blade group is adjusted according to feedback information, and the system can be used for realizing homogenizing adjustment of the flow field.

The double-discharge port silo has upper cylindrical section, lower conic section and branched bottom section with two discharge ports. Each of the two discharge ports has upper cylindrical section, lower conic section and discharge port in the bottom connected to below discharge pipe, in which there are gate valve, electric gas lock and spiral feeder. The double-discharge port silo with two discharge ports may be used flexibly in high reliability and its two discharge ports may be used simultaneously or with one as spare part. The present invention may be used widely for bulk material storing and transportation in metallurgical, building material, chemical other industry.

A super-vacuum insulation tank for cryogenic liquefied gas comprises a framework; and a tank body including an outer shell, an inner vessel, and a combined support structure connecting the outer shell and inner vessel. The combined support structure is only provided between the dome ends of the out shell and inner vessel at both ends of the tank, which can bear the force in both radial and longitudinal direction. The conduction heating surface between the inner vessel and the outer shell is small, but the support structure can bear heavy load, and the effective shipment volume of the inner vessel is large.

The invention discloses an operating system peripheral access permission control method based on users. The method includes the steps of firstly, building an equipment feature database, classifying the users into different user roles, building equipment application strategies and mandatory access control switches, and respectively building a user access control list, a user group access control list, and a user role access control list; updating the states of all the mandatory access control switches; secondly building and maintaining a system dialogue list; thirdly, monitoring equipment change in an operating system; fourthly, determining final access permission information according to peripheral equipment types, and controlling users' peripheral application in the operating system according to the mandatory access control switches and the final access permission information. The method is high in peripheral identification capability, safe and reliable, good in stability, good in universality, high in expandability, high in malware destroying preventing capability, fine in control granularity, and high in overall flexibility.

The invention discloses a flow monitoring method based on a wireless public network communication way for a power distribution terminal. According to the method, flow statistics of a GPRS (General Packet Radio Service) wireless communication power distribution terminal is realized, the hourly communication flow, daily communication flow and monthly communication flow of the wireless power distribution terminal are mainly monitored, and history information about flow is recorded, so that the flow change process of the wireless power distribution terminal is reflected. By adopting the flow monitoring method based on the wireless public network communication way for the power distribution terminal provided by the invention, abnormal flow in an APN (Access Point Name) special line is analyzed, so that the problem of out of control of the GPRS communication flow of the power distribution terminal is solved, and references are provided for the analysis of the GPRS access quality and charge management of the power distribution terminal.

The invention discloses an oil field liquid carbon dioxide injection device and an injection method, and belongs to the technical field of oil field exploitation. The injection device comprises a CO2 tank truck, a liquid inlet pipeline, a carbon dioxide plunger pump, a variable frequency motor, a controller, and a liquid extrusion pipeline. The CO2 tank truck is provided with a shielding pump. The liquid inlet pipeline is connected with the shielding pump to form a liquid supply pipeline. The inlet of the carbon dioxide plunger pump is connected with the other end of the liquid inlet pipeline. The variable frequency motor is connected with the carbon dioxide plunger pump. The controller is connected with the variable frequency motor. One end of the liquid extrusion pipeline is connected with the outlet of the carbon dioxide plunger pump, and the other end is connected with a Christmas tree. The liquid extrusion pipeline is provided with a safety valve, an electro connecting pressure gauge, an outlet pressure transmitter, an air release valve, and a pump outlet valve. The electro connecting pressure gauge and the outlet pressure transmitter are respectively connected with the controller. The electro connecting pressure gauge, the outlet pressure transmitter, the controller, and the safety valve form multiple interlock protection, and safety performance is high.

The invention relates to an unmanned aerial vehicle group control method and device. Each lead plane sends a first leader plane positioning signal to a plurality of wing planes. When each wing plane receives a plurality of first lead plane positioning signals sent by a plurality of lead planes, the position of each wing plane is positioned through the positions of the plurality of lead planes. Based on the plurality of first lead plane positioning signals, the high-precision positioning of each wing plane can be achieved. And each wing plane regulates and controls the flight attitude of the wing plane in real time based on the plurality of first lead plane positioning signals so as to complete a formation instruction and maintain a formation form. When one lead plane breaks down, each wingplane can still continue to conduct high-precision positioning based on the other first lead plane positioning signals, control errors cannot be amplified step by step, and the problem that in a traditional control method, the whole unmanned aerial vehicle group is out of control due to the fact that the lead plane breaks down is solved. And the robustness of an unmanned aerial vehicle formationcontrol system is improved.

The invention discloses a box body for interplanting mushrooms and plants. The box body comprises a box main body, mushroom planting shelves, a vegetable planting groove, an adjusting mechanism and awaterproof and breathable membrane mechanism, and a support is arranged above the portion inside the box main body. The adjusting mechanism comprises an electric control box, drying filters, a one-wayvalve, a water pump, an ultrasonic generator, an ozone sterilization generator, an antiosmosis filtering stick, a fog collecting box, a compressor, a lamp light adjusting system, a temperature adjusting system and a humidity adjusting system, the mushroom planting shelves are uniformly arranged under the support from top to bottom, the vegetable planting groove is formed below the mushroom planting shelves, and the waterproof and breathable membrane mechanism which relatively isolates a plant planting area and other areas of the box main body is arranged on the outer surface of the vegetableplanting groove. By means of the box body for interplanting the mushrooms and the plants, the problems that a large quantity of resources are wasted and the cost is high in the production process aresolved, and thus the purposes of increasing yield and income are finally achieved.

The present invention provides a virtualization platform east-west direction flow isolation protection method. In order to guarantee the flow safety between virtual machines in a cloud platform, the method employs SDN and VXLAN technologies to guide the flow of the cloud platform virtual machines requiring being protected to the outer portion of a server, the flow passes through safety protectionproducts such as FW, IPS and IDS to perform flow protection and then be returned to the other cloud platform virtual machine in the cloud platform so as to achieve isolation protection of the east-west direction flow. A stream guidance plug-in virtual machine and an independent vxlan tunnel are led to solve the problem that the east-west direction flow between the virtual machines in a traditionalcloud environment cannot be controlled and the problem of the safety protection, and therefore the virtualization platform east-west direction flow isolation protection method can be applied to a current mainstream cloud platform.

The invention belongs to the technical field of anesthesia device, in particular relates to a surface anesthesia needle tubing and using method thereof. The surface anesthesia needle tubing comprisesa cylinder body, a connecting cylinder is arranged at the lower end of the cylinder body, the outer side of the connecting cylinder is provided with a first external thread, the connecting cylinder isprovided with a fixing cylinder, the inner side surface of the fixing cylinder is provided with a first internal thread matched with the first external thread, the outer wall of the upper part of thefixing cylinder is integrally formed with a hexagon block, the lower part of the fixing cylinder is provided with a slot, the surface of the slot is provided with a drug injection hole, the card is positioned between the two side plates, the right end of the card is provided with a strip-shaped notch, the card right end through-hole strip-shaped notch is stuck on the card board, the card column is positioned on the end face of the right end of the card, the portion of a screw rod, on the upper end face of a thread bushing, is sleeved with an inverted L-shaped ruler plate, the outer wall of the upper part of the side plate is provided with a graduation line matched with the inverted L-shaped ruler plate, and the upper end of the central rod is detachably connected with a handle. The aim ofthe surface anesthesia needle tubing is to solve the problems of uncontrollable anesthesia range caused by the existing epidermal anesthesia device structural defects, waste of anesthesia drugs and difficulty in extracting anesthesia medicines.

The invention provides a variable electro-hydraulic servo hydraulic transformer, and relates to an electro-hydraulic servo hydraulic transformer which resolves the problems that an existing hydraulic transformer is controllable in loading pressure and uncontrollable in loading flow, alternatively, the loading pressure and the loading flow are coupled, hydraulic transformers of different standards need to be applied to different areas, and universalization is not achieved. The variable electro-hydraulic servo hydraulic transformer comprises a thrust plate servo mechanism and a swash plate servo mechanism, the valve plate servo mechanism comprises a thrust plate, an end cover, a thrust shell, a bearing cover, a bearing, a first hydraulic control valve and a swing motor, the thrust plate is in detachable connection with a blade shaft, a motor shell is arranged between the end cover and the thrust shell and in detachable connection with the end cover and the thrust shell, and the first hydraulic control valve is arranged on the motor shell. The swash plate servo mechanism comprises a cylinder, a hydraulic cylinder, a second hydraulic control valve, a swash plate, a shell, a transmission shaft and a plurality of plungers, wherein the shell is in detachable connection with the end cover. The variable electro-hydraulic servo hydraulic transformer is used for a system control valve of the hydraulic field.