63results about How to "Increase safety redundancy" patented technology

The invention discloses a drive-by-wire hydraulic steering braking system and method, and relates to the field of vehicle chassis. The drive-by-wire hydraulic controller obtains a control instruction of the vehicle control unit and controls the steering valve group to adjust the angular velocity and deflect at a target steering angle according to the control instruction so as to perform movement in different steering modes; the kingpin angle sensor obtains the actual steering angle and the actual angular speed of the mechanical vehicle and feeds back the actual steering angle and the actual angular speed to the drive-by-wire hydraulic controller; the drive-by-wire hydraulic controller obtains a steering angle difference value according to the steering angle and a target steering angle, obtains an angular velocity difference value according to an actual angular velocity and a target angular velocity, and controls a steering valve group to adjust the steering angle and the angular velocity according to the steering angle difference value and the angular velocity difference value by adopting a PID control method; and the brake valve group brakes according to the brake instruction. The steering requirements of various types of vehicles can be met, and the safety redundancy is high.

The invention discloses an intelligent centralized control method and system for an air compressor unit and a storage medium, and the method comprises the steps: building a first correlation model which is used for representing the correlation between the air pressure fluctuation of each air supply node, and a second correlation model which is used for representing the correlation between the air flow temperature of a specific section in an air supply pipe network and the air pressure of each air supply node; meanwhile, corresponding fluctuation models and weight values are configured for all the air supply nodes, so that the system can predict the air pressure requirements of all the air supply nodes in the future set time period based on the current air pressure data and temperature data of all the air supply nodes, and then the air pressure requirements of all the air supply nodes in the future set time period are predicted by changing the conduction relation of the air supply nodes and the local temperature of the air supply pipe network. The air pressure of the air supply node is adjusted, the air demand at the air supply node is responded in advance, accurate control over the air pressure at the tail end of the air supply pipe network is achieved, and air pressure fluctuation at the tail end of the air supply pipe network is reduced.

A vertical shaft excavation system adopting a wire saw method solves the problems that a vertical shaft excavation system is low in construction efficiency, large in investment, high in cost and long in construction period, a first guide hole and a second guide hole are formed in the upper end and the lower end of a vertical shaft, upper and lower annular beams and upper and lower wire saw machines are installed on the first guide hole and the second guide hole respectively, and upper and lower annular rails are installed on the upper and lower annular beams respectively; the upper cross beam stretches across an upper annular rail at the upper end of the vertical shaft, the lower cross beam stretches across a lower annular rail at the lower end of the vertical shaft, the lateral walking trolley and the forward walking trolley are QSC three-in-one motor-driven rigid wheels, the first upper rope sawing machine, the second upper rope sawing machine, the first lower rope sawing machine and the second lower rope sawing machine are respectively provided with a first driving wheel, a second driving wheel, a third driving wheel and a fourth driving wheel, and the first driving wheel and the fourth driving wheel are respectively located at the upper end and the lower end of a first guide hole. The second driving wheel and the third driving wheel are located at the upper end and the lower end of the second guide hole respectively, and the first-fourth driving wheels and the rope saw chain wind around the first-fourth driving wheels, the upper guide pulley and the lower guide pulley to form a closed loop.

This invention discloses a multi-level redundant protection elevator anti-overshoot and anti-fall composite braking and buffer system, including a guide rail electromagnetic adsorption braking module, a directional airflow damping deceleration module, a robotic arm-type safety airbag buffer module, a working condition detection unit, and an intelligent control and power supply redundancy module. The guide rail electromagnetic adsorption braking module includes excitation coils, insulated fixing brackets, and segmented switch units arranged in sections along the elevator's T-shaped vertical guide rail. The directional airflow damping deceleration module includes directional air supply modules and segmented airflow ducts installed at the top of the elevator shaft and on the vertically segmented side walls of the shaft. The robotic arm-type safety airbag buffer module is embedded in the lower surface of the elevator shaft's top floor slab. The working condition detection unit integrates a car speed sensor, a position encoder, a load acquisition unit, an acceleration monitoring unit, an overshoot / undershoot limit prediction switch, and an airbag trigger distance sensor. This invention integrates a three-level progressive protection structure to achieve flexible protection throughout all working conditions and the entire travel distance.

The invention relates to the technical field of urban construction, in particular to a kerb and tile visual grabbing control system. A kerb and tile visual grabbing control system comprises a visual identification module, a system control module and a six-axis mechanical arm module, the six-axis mechanical arm module comprises a mechanical arm main body and an auxiliary control assembly, the mechanical arm main body is used for grabbing and laying kerbs and tiles, and the auxiliary control assembly is used for controlling the mechanical arm main body. The mechanical arm body comprises a supporting arm, a lifting arm, a swing arm and a mechanical claw which are sequentially and rotationally connected, and the auxiliary control assembly is connected between the front end of the supporting arm and the front end of the swing arm and used for supporting the mechanical arm body and reducing the equipment load. According to the mechanical arm, the torque generated to the front end of the swing arm when the mechanical claw grabs a heavy object can be effectively shared, the load of each joint motor is greatly reduced, and therefore the structural rigidity and the movement stability of the whole mechanical arm under the heavy-load and large-arm-span working conditions are enhanced, and the precision and stability of the laying action are ensured.

The invention belongs to the technical field of monorail crane oil temperature control, and particularly relates to a distributed oil temperature control system and method suitable for a monorail crane. An oil suction port of the variable hydraulic pump is connected with a hydraulic oil tank; an inlet of the high-pressure filter is connected with an oil outlet of the variable hydraulic pump; the heat dissipation part is connected to an outlet oil way of the high-pressure filter in series; the pilot control oil way comprises a pilot overflow valve group, a temperature control valve group and a shuttle valve; a P port of the pilot overflow valve group is connected with an oil outlet of the high-pressure filter, and an A port of the pilot overflow valve group is connected with an outlet of the heat dissipation part; a port P of the temperature control valve group is connected with a control oil outlet of the pilot overflow valve group, and a port T of the temperature control valve group is connected with a hydraulic oil tank and used for sensing system oil temperature; a port A of the shuttle valve is connected with an outlet of the temperature control valve set, and a port R of the shuttle valve is connected with a port X of the volume adjustable hydraulic pump. The temperature control valve set is arranged to adjust pilot control oil pressure according to oil temperature changes, the displacement of the volume adjustable hydraulic pump is controlled through the shuttle valve, and self-adaptive control over the rotating speed of the cooling fan is achieved.

This invention belongs to the field of exhaust gas treatment technology, and specifically relates to an exhaust gas combustion furnace, including an igniter, a combustion chamber, a base, and a main exhaust pipe. The igniter is connected to one end of the combustion chamber, and the main exhaust pipe is connected to the other end of the combustion chamber. The base is fixed to the bottom of the combustion chamber, and an outer expansion body is mounted on the outside of the base, enclosing the combustion chamber. The outer expansion body has multiple pairs of movable slots, each pair of slots being located on the left and right sides of the combustion chamber and communicating with it. An opening and closing door is movably connected within the movable slot, and a secondary exhaust pipe is inserted into the side of the opening and closing door. The advantages are: this invention can flexibly change the combustion space during instantaneous combustion, thereby achieving rapid pressure relief and expansion, preventing excessive internal pressure of the combustion chamber from causing damage, and improving safety redundancy.

This invention discloses a vehicle trust assessment method for cooperative decision-making at unsignalized intersections, belonging to the field of intelligent transportation and autonomous driving cooperative control technology. The method first acquires multi-source state and interaction information of the target vehicle and conflicting vehicles, constructing reference position estimates and physical interaction characteristics. Then, based on multi-source observation consistency analysis, it calculates the information reliability of the target vehicle and, combined with the spatiotemporal interaction relationship between vehicles, calculates the physical interaction trust of the conflicting vehicle pairs. Further, it determines the comprehensive trust based on the information reliability and physical interaction trust, and generates a safe time interval between vehicles based on the comprehensive trust. This interval is then used as a conflict constraint parameter input into the intersection cooperative scheduling model to achieve adaptive optimization control of vehicle passage order and entry time. This method can adaptively adjust the safe time interval between vehicles under conditions of uncertainty in vehicle state information, differences in vehicle execution consistency, and complex interaction relationships, improving the safety, stability, and traffic efficiency of cooperative decision-making at unsignalized intersections.

The invention discloses a control method for an electronic hydraulic braking system, and relates to the technical field of vehicle braking, and the control method comprises the step of controlling opening and closing of a decoupling electromagnetic valve, a first linkage electromagnetic valve and a second linkage electromagnetic valve based on a braking mode instruction so as to execute a braking action corresponding to a wheel braking unit. By the adoption of the control method for the electronic hydraulic brake system, the brake master cylinder is arranged to be of a three-cavity structure, brake control over the wheel brake unit under multiple hydraulic lines is achieved through pressure adjustment of the three brake cavities of the brake master cylinder based on opening and closing control over the decoupling solenoid valve, the first linkage solenoid valve and the second linkage solenoid valve, and the brake control over the wheel brake unit under multiple hydraulic lines is achieved. The safety redundancy capacity of the braking system is greatly improved, and the braking stability under different working conditions is guaranteed.

The application discloses a disc buckle type scaffold self-locking lower support structure and relates to the technical field of scaffolds, which comprises a supporting screw rod and an extension assembly. The extension assembly provides a detachable sleeve shaft structure between the supporting screw rod and a supporting sleeve rod. When thread damage occurs, only the damaged sleeve shaft structure needs to be quickly removed and replaced, thereby reducing maintenance cost and the risk of thread damage failure, and the safety redundancy is higher. The sleeve shaft can be designed as a variable-diameter adaptive structure, which is compatible with multiple specifications of thread sizes, improves adaptive flexibility, and expands the application range. Height adjustment is realized through the threaded connection of the moving sleeve rod and the supporting screw rod. The supporting sleeve rod is inserted into the top of the moving sleeve rod, the limiting sleeve rod is slid into the inside of the supporting sleeve rod, and after the limiting sleeve rod is inserted into the moving sleeve rod, the combination of the moving sleeve rod and the limiting sleeve rod is realized through the penetration connection of the fixing screw, so that the detachable sleeve shaft structure is formed. The connecting disc closes the top of the supporting sleeve rod and provides connection support for other scaffold structures.

The application discloses a kind of man-machine interaction risk prediction and adaptive safety avoidance methods, systems and media for automatic plant vehicle, first through multi-source sensing synchronous acquisition plant vehicle working condition and plant environment data, rely on pre-constructed plant semantic map matching pedestrian space attribute;Solving motion parameters to pedestrian multi-frame tracking, generate multi-probability prediction trajectory in combination with plant topology;Again, segmentation sensor occlusion area, infer potential pedestrian risk in blind area based on multi-feature Sigmoid model;Fusion explicit pedestrian, blind area pedestrian, plant semantic component constructs space-time man-machine interaction risk field;In combination with vehicle speed, load, trajectory uncertainty Real-time generation dynamic safety zone;According to risk overlap index Implementation four-level hierarchical control, and supporting sensor abnormality three-level safety degradation strategy.The application breaks through the defect of traditional fixed safety threshold, only passive obstacle avoidance, can predict pedestrian multiple motion behaviors in advance, early warning blind area sudden pedestrian risk, applicable to AGV, unmanned fork truck and other man-machine mixed plant scene.

The invention discloses an electronic hydraulic brake system which comprises a pedal, an oil can module, a brake master cylinder, a pressure buildup unit and a wheel brake unit, two brake pistons are arranged in the brake master cylinder in a sliding mode, and the two brake pistons divide the interior of the brake master cylinder into three brake cavities. Three brake cavities are formed in the brake master cylinder, brake control over the wheel brake unit can be achieved through cooperation of the pressure buildup unit and the first linkage electromagnetic valve or the second linkage electromagnetic valve in the decoupled state of the pedal and the brake master cylinder, and meanwhile a pressure buildup cylinder of the pressure buildup unit can communicate with the brake master cylinder and the wheel brake unit. And when the brake master cylinder and the wheel brake unit leak oil and fail, oil can be supplemented, so that oil leakage fault repair of the brake system is realized, and the safety redundancy capability of the brake system is further improved.

The invention discloses a mammary gland endoscope preoperative anatomical variation identification method and system, and relates to the technical field of computer data processing. The method comprises the following steps: S1, acquiring heterogeneous source data, and performing spatial registration and data standardization fusion to generate a multi-dimensional fusion data set; s2, performing basic topological feature extraction based on the multi-dimensional fusion data set, and calculating edge weight information to construct a target topological graph; s3, matching and comparing the target topological graph with a preset standard topological database, and calculating topological compliance parameters based on comparison differences; s4, identifying a parameter abnormal region according to the spatial distribution characteristics of the topological compliance parameters, and generating a spatial security constraint model in combination with local spatial medium attributes; and S5, based on the spatial security constraint model, outputting structure abnormal information and corresponding optimized path planning parameters. And through multi-channel tensor quantization variation characteristics, safety constraints are constructed by using an anisotropic bounding box, and a path is optimized in combination with a potential field algorithm, so that high-precision automatic obstacle avoidance is realized.

The embodiment of the invention provides a suspension system and a vehicle. The suspension system comprises a base, a linear motor, an elastic piece and a magnetorheological damper, the base comprises a support and a lower supporting seat, one of the support and the lower supporting seat is suitable for being connected with a vehicle body, and the other one of the support and the lower supporting seat is suitable for being connected with a wheel; the linear motor comprises a stator and a rotor, one end of the rotor is connected to the support, and the end, away from the support, of the stator is connected to the lower supporting base. The elastic piece is arranged between the support and the stator and provides elastic force between the support and the stator; the magneto-rheological damper comprises an outer cylinder and a damper piston which is arranged in the outer cylinder and can move linearly relative to the outer cylinder, the magneto-rheological damper is arranged in the rotor, the outer cylinder is connected to the rotor, and the damper piston is suitable for being connected to the lower supporting base. According to the scheme, the energy consumption of the suspension system is reduced, the performance is improved, the safety redundancy is improved, and the cost is reduced.

The invention provides a light guide beam and main beam quick connecting structure for a large-span steel box girder bridge, and belongs to the field of bridge engineering. The device comprises a steel box main beam and a light guide beam, a transverse supporting plate and a longitudinal supporting plate are arranged in the steel box main beam, the light guide beam comprises two I-shaped main beams and a middle connecting frame, and a plurality of lock sleeves located on the outer side of the steel box main beam are fixedly installed on the transverse supporting plate. The ends, close to the steel box main beam, of the two I-shaped main beams are each provided with a quick positioning and locking mechanism, the quick positioning and locking mechanisms are used for being matched with a lock sleeve to achieve fixed connection of the steel box main beam and the light guide beam, and the lock sleeve is provided with a plurality of L-shaped lock openings which are rotationally and symmetrically distributed. And the quick positioning and locking mechanism comprises a plurality of rotatable rotating sleeves. The light guide beam and main beam quick connecting structure for the large-span steel box girder bridge has the advantages of being accurate in positioning, efficient in connection and reliable in locking.

The present invention discloses a ship fuel supply system, including a fuel storage tank T, wherein a centrifugal fuel pump P is arranged in the fuel storage tank T, and the centrifugal fuel pump P inputs the LNG in the fuel storage tank T into a cryogenic vacuum pump pool D through an ultra-low temperature pipeline, and a high-pressure fuel pipeline and a low-pressure fuel pipeline are arranged downstream of the cryogenic pump pool D. The cryogenic pump of the present invention belongs to a hydraulic pump, and the hydraulic pump is installed in the pump pool as a whole, and the medium has no leakage, which effectively reduces the system cooling loss, reduces the vaporization amount, helps to optimize the working conditions when the cryogenic pump is running, and effectively prolongs the pressure storage time of the storage tank.

The present application relates to the technical field of railway track inspection, and particularly relates to a high-speed railway intelligent track inspection operation robot operation monitoring method and system, the present application combines track turnout state data and seismic influence data to analyze abnormal conditions of track passage detection conditions, and according to the analysis result, analyzes the threat degree of the execution environment of the robot post-earthquake track inspection operation task; combining the robot's own operation data and track turnout state data, analyzes the abnormal conditions of the robot post-earthquake track inspection operation task's own operation control; based on the execution environment threat degree of the robot post-earthquake track inspection operation task, the abnormal conditions of the robot post-earthquake track inspection operation task's own operation control, the track inspection operation risk of the robot post-earthquake track inspection operation task is evaluated; according to the evaluation result, the robot emergency braking early warning is realized, so as to guarantee the operation safety of the inspection robot in the earthquake destructive environment, and the intelligent level of the high-speed railway post-earthquake track inspection operation is significantly improved.

The invention relates to the technical field of automobile seats, and provides an automobile seat partition rapid temperature control and fatigue awakening device and method. The device sequentially comprises a coating layer, a flexible soaking layer, a thermoelectric module array, a micro-channel liquid cooling plate, a heat insulation supporting layer, a sponge substrate, a pressure sensor array, a temperature sensor array, a control unit, a liquid cooling circulating pump and an air conditioner heat exchanger. The thermoelectric module array at least comprises two semiconductor thermoelectric modules which are respectively arranged in the cushion area and the neck area; the control unit controls the corresponding semiconductor thermoelectric module and the liquid cooling circulating pump to perform top-speed heating or top-speed cooling; and when a fatigue state signal of the vehicle-mounted DMS system is received, the semiconductor thermoelectric module at the neck is controlled to output high-frequency pulse current so as to generate rapid temperature difference jump. The thermoelectric module is coupled with an air conditioner liquid cooling loop through the micro-channel liquid cooling plate, the heat dissipation bottleneck of a traditional semiconductor seat is solved, and dynamic temperature control of each partition is achieved by generating a body pressure cloud picture.

The utility model discloses a four point of prefabricated concrete block's even load hoisting structure, including a plurality of groups fixed setting on the hoisting ring of prefabricated concrete component, every group hoisting ring at least includes two, and the inside of every group hoisting ring is provided with a rigid link, and the rigid link passes through all hoisting rings of this group, and the middle part of rigid link is fixedly connected with one end of steel wire rope, and the other end of a plurality of steel wire ropes is concentrated in hoisting equipment lifting point. Both ends of rigid link are fixedly provided with end anti -slip device. Through the even load design of " multiple hoisting ring + rigid link", effectively disperses the concentrated load, and the safe lifting weight of single lifting point is doubled, and successfully breaks through the technical bottleneck of the hoisting of hundred tons class concrete component. The rigid link ensures that a plurality of hoisting rings are uniformly and synchronously stressed, and the end anti -slip device completely eliminates the risk of rod disengagement, and the structure is stressed explicitly, and the safety redundancy is high.

The utility model discloses a kind of kart vehicle body telescopic adjusting devices and kart. The device is applied to the kart vehicle body with front vehicle support and rear vehicle support, load bar is equipped on front vehicle support, hollow sleeve rod is equipped on rear vehicle support opposite to load bar, load bar can slide in axial direction to change the distance between front and rear vehicle support. Adjusting component includes shell body fixed on front vehicle support, direction conversion structure arranged in shell body and screw rod cooperated with nut and sleeve, direction conversion structure is made of meshing gear set, for converting hand lever rotation into screw rod autorotation and driving vehicle body telescopic;Between load bar and hollow sleeve rod is sliding fit, end portion is equipped with limit structure, and scale mark is set on load bar and / or hollow sleeve rod. The kart using the device can conveniently adjust wheelbase within a certain range, adapt to drivers of different heights, with simple structure, low cost, safe and reliable adjustment.

This invention discloses a magnetic coding unit material for road area information used in autonomous driving and its preparation method. The magnetic coding unit material is made of asphalt, limestone, magnetic ceramics, and composite mineral powder. The mass of the asphalt is 5.1% of the sum of the masses of the limestone and composite mineral powder, and the mass of the magnetic ceramics is 10%-80% of the sum of the masses of the limestone and magnetic ceramics within the same gradation range. After being magnetized by a magnetizer, the material of this invention, combined with an onboard gaussmeter, can read the binary coding information of the road, achieving comprehensive, rapid, and efficient detection and identification of road area information. It has advantages such as low cost, high reliability, energy saving, and environmental protection, while also possessing good thermal stability, corrosion resistance, mechanical properties, and electromagnetic characteristics.

The application provides a battery system and an energy storage device. The battery system comprises a battery and a BDU module. The BDU module comprises a switch module. A first end of the switch module is connected with the battery, and a second end of the switch module is used for being connected with an external device. The switch module comprises at least two switch elements connected in parallel. Each switch element can be switched between a closed state and an open state, so that each switch element can connect the battery and the external device. The battery system provided by the application ensures that the battery system can work stably, and improves the safety redundancy of the battery system.

The application discloses a kind of fast frequency modulation demand evaluation method and device considering low penetration power recovery characteristics, method includes: constructing the system frequency response model of time-varying disturbance and fast frequency modulation response model considering in low penetration fault process;Frequency minimum point is obtained according to system frequency response model;With the inherent delay time of fast frequency modulation response model, ramp rate and action capacity upper limit construct optimization vector;According to optimization vector, initial optimization matrix is constructed;After abnormal vector elimination to initial optimization matrix according to frequency minimum point, the fitness of each vector is calculated according to preset target function, and the vector with highest fitness is selected as first vector;With first vector as update reference, first matrix is obtained by adaptive optimization through IAOA algorithm;Initial optimization matrix is updated to first matrix and iterative optimization is carried out;After iteration, the vector with highest fitness in last iteration is output.

This invention belongs to the field of elevator light curtain technology and discloses an elevator light curtain with door opening and closing warning function. It includes a light curtain housing and positioning frames fixed at both ends. A groove is formed on the left side of the light curtain housing, and the light curtain body is connected inside the groove. Warning LEDs are installed on both sides of the light curtain body. A movable frame is fitted around the outside of the light curtain body. Limiting grooves are formed on the front and rear sides of the light curtain housing, and the movable frame slides in cooperation with the limiting grooves. This elevator light curtain with door opening and closing warning function completely changes the traditional "passive response" safety protection mode of light curtains through the design of multiple arrays of dual-color warning LEDs, constructing an active and efficient warning system. During the elevator door closing process, the high brightness and wide warning range of the dual-color flashing lights can clearly remind the elderly and children who move slowly, and can also effectively attract the attention of passengers focused on electronic devices, avoiding collisions or pinching accidents caused by delayed reaction.

The utility model discloses a kind of automatic pressure relief structures of bubble bottle, including the bottle body for being connected on gas transmission host, gas transmission arm is equipped on gas transmission host, gas transmission arm is equipped with the gas transmission nozzle for conveying gas, bottle body top is connected with the bottle cap assembly for being closed, air inlet channel for being used to realize gas injection by being butt-jointed with gas transmission nozzle is equipped on bottle cap assembly, at least first air release channel is equipped on bottle cap assembly and correspondingly first pressure relief hole for being used to communicate first air release channel with bottle body inner cavity is equipped, first valve core is equipped in first air release channel, elastic component for pushing first valve core and closing first pressure relief hole, elastic component lower end abuts first valve core, elastic component upper end is exposed, and when gas transmission nozzle is butt-jointed with air inlet channel, elastic component upper end abuts on gas transmission arm, and then when bottle body leaves gas transmission arm, elastic component loses support, first valve core is separated from first pressure relief hole under the action of bottle pressure, realize automatic pressure relief, guarantee sealing performance and dismounting convenience.

The embodiment of the invention relates to a wallboard with an interlocking structure, a layer structure comprises an inner layer board, an aerogel coating and a facing board, so that the sound insulation and heat preservation effects of the wallboard are ensured; wherein the inner-layer plate comprises a framework and a panel; the framework comprises a plurality of transverse ribs, vertical ribs and convex rib reinforcing ribs; a plurality of bulges are arranged on the outer side of the panel; a plurality of grooves matched with the protrusions are formed in the inner side of the facing plate, and mechanical occlusal force is formed through the protrusions and the grooves. When the wallboard is used, in the y-axis direction of the straight line where the transverse ribs are located and the z-axis direction of the straight line where the vertical ribs are located, the wallboard resists an in-plane load through the mechanical meshing force of the convex ribs, the friction force of an overlapping interface and the bonding force of the aerogel coating; in the x-axis direction perpendicular to the transverse ribs and the vertical ribs, the wallboard resists out-of-plane loads through the mechanical occlusal force of the protrusions and the friction force of the overlapping interface, and therefore a three-direction interlocking mechanism of an existing heterogeneous material layer is formed, the strength of the wall is guaranteed, and the wall is not prone to falling off.

The invention provides a network bypass circuit and method based on wired transmission in the technical field of wired transmission. The network bypass circuit comprises a CPU, a relay control circuit, a relay set, a first network port, a second network port, a first network card and a second network card. The relay group comprises a first relay, a second relay, a third relay, a fourth relay, a fifth relay and a sixth relay; the first network port, the third relay, the fourth relay and the first network card are sequentially connected in series; the second network port, the fifth relay, the sixth relay and the second network card are sequentially connected in series; after the first relay and the second relay are connected in parallel, one end is connected with the first network port, and the other end is connected with the second network port; the CPU is connected with the relay control circuit, the first network card, the second network card, the first relay, the second relay, the third relay, the fourth relay, the fifth relay and the sixth relay. The network bypass circuit has the advantage that the operation reliability of the network bypass circuit is greatly improved.

This invention relates to the field of automotive power steering pump technology, specifically to a dual-source electric power steering pump switching control system and its power steering pump. The system includes a motor housing and a stator winding fixed inside and within the motor housing. The stator winding consists of a high-voltage winding and a low-voltage winding, which operate independently. When the vehicle's high-voltage power supply fails, the stator winding switches from high-voltage to low-voltage operation. This dual-source electric power steering pump switching control system, combined with the single-motor, dual-winding design of the dual-source electric power steering pump, enables switching to the low-voltage winding when the vehicle's high-voltage power supply fails. This drives the power steering pump to provide degraded but safe power steering assistance, achieving a "limp-home" function, preventing the vehicle's steering wheel from completely losing power assist, facilitating parking, and improving safety redundancy.

The invention belongs to the field of battery inactive part structures, and particularly discloses a lithium battery multistage explosion-proof mechanism used in a vacuum high-temperature environment, the lithium battery multistage explosion-proof mechanism comprises a shell, a heat absorption material and a pressure release valve, a partition plate is arranged in the shell, the partition plate divides the shell into a battery cabin and a material cabin which are relatively independent, and a plurality of pressure release holes are formed in the partition plate in a penetrating manner; the shell is provided with a pressure relief opening, and the pressure relief opening communicates with the material bin. The heat-absorbing material is granular and is filled in the material cabin; and the pressure relief valve is mounted at the pressure relief opening. Along with the heating process of the battery, the air pressure in the shell is effectively reduced through three pressure relief mechanisms, and the safety redundancy is improved.

The utility model discloses a directional drilling hole wall stability maintaining device applied to a fractured stratum, which belongs to the technical field of engineering geological investigation and comprises a main pipe body, a sealing unit and a separating unit, and the sealing unit and the separating unit are respectively sleeved on the main pipe body. The two sealing units are arranged in the axial direction of the main pipe body in a spaced mode so that a closed space can be formed between the two sealing units. The closed space is divided into a plurality of subspaces through a plurality of separation units, and grouting holes are formed in the main pipe body so that the subspaces can be filled with slurry. The separation units in the hole wall stability maintaining device can provide radial support for the main pipe body while separating the closed space, then in the grouting process, grouting permeation reinforcement and active supporting of the separation units are achieved at the same time, meanwhile, an anchoring piece can be arranged so that mechanical anchoring can be achieved, a collaborative supporting system can be constructed, and the hole wall stability maintaining device can be used for maintaining the hole wall stability. The stability of grouting operation is greatly improved, the safety redundancy is improved, and the engineering accident risk is reduced.