62results about How to "Reduce the impact of traffic" patented technology

The invention discloses a steel truss bridge and a method for fabricating the same. The steel truss bridge comprises a steel box girder bridge deck, a main truss composed of two steel trusses, and a steel portal frame. The steel truss comprises an upper chord member, a lower chord member, and a web member which is connected with the upper chord member and the lower chord member through bolts. A sidewalk bracket is arranged outside each steel truss. The lower chord member is connected to the steel box girder bridge deck and the sidewalk bracket, respectively. Besides, the two steel trusses are connected through the steel portal frame. During fabrication, all the sections of the steel trusses, the steel portal frame and the bridge deck are independently fabricated, respectively; all the sections of the upper and lower chord members of the steel truss are pre-assembled circularly with the corresponding web members, and all the sections of the steel box girder bridge deck are pre-assembled with the corresponding lower chord members by an orthotectonic method, respectively; and the steel portal frame is pre-assembled with the steel trusses. The steel truss bridge disclosed by the invention completely meets the design requirements so that the stability and safety factor of the bridge can be enhanced; and by employing the fabricating method, positioning is accurate so that the risks during the field assembling can be reduced; and the construction period can be shortened.

The invention discloses an automatic detection robot system for a road surface. The automatic detection robot system for the road surface comprises a robot body and a remote monitoring auxiliary system. Information is transmitted between the robot body and the remote monitoring auxiliary system in a wireless communication way. A control system, a nondestructive detection system and an operation mechanism are arranged on the robot body. The operation mechanism is installed on the robot body. The nondestructive detection system is connected with the operation mechanism. The control system is electrically connected with the operation mechanism. The control system is electrically connected with the nondestructive detection system. The nondestructive detection system comprises a resistivity meter. The operation mechanism comprises a telescopic mechanism. The resistivity meter is connected with the telescopic mechanism. The invention further discloses a detection method for the road surface. By the adoption of the robot system, intelligent detection can be achieved, and since manual driving is not needed, the detection safety and the accuracy of detection data are improved; since various nondestructive detection sensors are integrated, comprehensive estimation of the road surface and the internal condition can be achieved at a time, the detection efficiency is greatly improved, and the influence of the trafficability of a road is also reduced.

The invention relates to an intelligent crosswalk traffic-light control device, which comprises a microprocessor, a traffic-light control module and a pedestrian data acquisition unit, wherein the pedestrian data acquisition unit acquires the quantity of pedestrians at two ends of a crosswalk in real time; the microprocessor is provided with a communication module in order to obtain traffic-state data of intersections at two ends, which is related to a road; according to the related traffic-state data and pedestrian-quantity data of the intersections at two ends, with the support of preset programs, the microprocessor determines the starting time and time span of a green light allowing the pedestrians to pass and generates traffic-light control instructions; and the traffic-light control device is connected with the microprocessor through a signal line, and receives control signals output by the microprocessor to switch working states of traffic lights. The device can allow the pedestrians to pass under the circumstance that vehicles on the road is small in flow, thereby reducing the influence on the vehicles and overall road traffic conditions as much as possible while ensuring the passing of the pedestrians.

The invention discloses a movable guardrail intelligent routing inspection platform, which comprises a routing inspection platform body and a remote control system, wherein the routing inspection platform body comprises a moving mechanism, a case, a guardrail upright post burying depth detection unit arranged on the case, a road image acquisition unit, a data processing unit and a data transmission unit; the guardrail upright post burying depth detection unit comprises a detection probe and a probe positioning device; the data processing unit performs processing and analysis on the image information on the pavement and the road side slope acquired by the road image acquisition unit; the analysis result is transmitted to the remote control system by the data transmission unit through a wireless communication network. The movable intelligent routing inspection platform provided by the invention uses the existing wave-form steel guardrail of the highway as a rail, and can realize the motion states of advancing, reversing, stopping and the like along the steel guardrail; meanwhile, the fully automatic operation of the road condition daily routing inspection and guardrail whole line detection can be realized.

The invention discloses a caterpillar track type road surface autonomous detection robot system which comprises a caterpillar track type robot and a remote monitoring auxiliary system. The caterpillar track type robot and the remote monitoring auxiliary system transmit information in a wireless communication manner. The caterpillar track type robot is provided with a control system, a nondestructive detection system and an operation mechanism; the operation mechanism is installed on the caterpillar track type robot; the nondestructive detection system is connected with the operation mechanism; the control system is electrically connected with the operation mechanism and the nondestructive detection system; and the nondestructive detection system comprises a resistivity meter, the operation mechanism comprises a telescopic mechanism, and the resistivity meter is connected with the telescopic mechanism. The invention further discloses a road surface detection method. By the adoption of the robot system, intelligent detection can be achieved; due to the fact that manual driving is not needed, the detection safety and the accuracy of detected data are improved; various nondestructive detection sensors are integrated, the road surface and the inner condition of the road surface can be comprehensively evaluated at a time, the detection efficiency is greatly improved, and the influences on the road passage are reduced as well.

The invention discloses an intelligent hub pavement autonomous detection apparatus. The apparatus comprises a vehicle body, the vehicle body is provided with a control system, a nondestructive detection system and an operating mechanism, the operating mechanism is arranged on the vehicle body, the nondestructive detection system is connected with the operating mechanism, the control system is electrically connected with the operating mechanism, and the control system is electrically connected with the nondestructive detection system; and the nondestructive detection system comprises a resistivity instrument, the operating mechanism comprises telescoping mechanisms, the resistivity instrument is connected with the telescoping mechanisms, and the bottom of the vehicle body is provided with an independent driving turning device. The intelligent hub pavement autonomous detection apparatus improves the detection safety and the accuracy of detected data due to no manual driving; and the apparatus integrates various nondestructive detection sensors, so the apparatus can realize one-shot comprehensive assessment of the pavement (comprising internal) conditions, thereby the detection efficiency is greatly improved, and influences on the trafficability of roads are reduced.

The invention discloses a hub-type robot system for autonomously detecting road surfaces. The hub-type robot system comprises a robot body and a remote-monitoring auxiliary system, wherein information is transmitted between the robot body and the remote-monitoring auxiliary system by a wireless communication mode; the robot body is provided with a control system, a non-destructive detection system and an operation mechanism; the operation mechanism is arranged on the robot body; the non-destructive detection system is connected with the operation mechanism; the control mechanism is electrically connected with the operation mechanism and the non-destructive detection system; the non-destructive detection system comprises a resistivity instrument; the operation mechanism comprises a telescopic mechanism; the resistivity instrument is connected with the telescopic mechanism; an independently driven steering device is arranged at the bottom part of the robot body. The invention also discloses a road-surface detecting method. By adoption of the hub-type robot system disclosed by the invention, intelligent detection can be realized; due to no need of manual driving, the detection safety and the accuracy of data detection are improved; multiple non-destructive detection sensors are integrated into one, comprehensive evaluation on the road surfaces and the internal conditions can be realized, the detection efficiency is greatly improved, and the influence on the road trafficability is also reduced.

The invention relates to an efficient and safe pedestrian crossing traffic light control system, comprising a central processing unit, a pedestrian data acquisition unit, a traffic light control unit, a vehicle barrier cross bar control unit and a vehicle barrier cross bar mechanism; wherein the pedestrian data acquisition unit acquires pedestrian quantity at the two ends of the pedestrian crossing, the central processing unit calculates a time period with minimal traffic flow in a permissive time range, determines the green light starting time and time duration in the pedestrian direction and generates a traffic light control instruction and a vehicle barrier cross bar control instruction, the traffic light control unit is connected with the central processing unit by a signal wire, and the vehicle barrier cross bar control unit is connected with the central processing unit by the signal wire. The invention can allow the pedestrian to pass when the motor vehicle flow on the road is small, so as to ensure the passing of the pedestrian while reducing the influence on the motor vehicle and the whole road traffic condition to the utmost extent.

The invention discloses a connecting structure of a combined beam and a concrete supporting cross beam, comprising a steel girder and a concrete supporting cross beam, wherein the steel girder is disconnected at an intermediate pivot and is connected with the concrete supporting beam; an end plate is arranged at the end part of the steel girder and is provided with an open pore plate or is connected with the steel girder and the concrete supporting cross beam through weld screws so as to transfer the shearing force and the bending moment of a beam body; constructional steel bars are arranged in the concrete supporting cross beam; the constructional steel bars and a main forced steel bar form a steel reinforcement cage together; and a concrete pier is provided with a support seat which is supported on the bottom of the concrete supporting cross beam. The connecting structure reduces the tensile stress of a bridge panel in a negative bending moment area, caused by the shrinkage, the creep and the temperature of the concrete, and has concise and definite force transfer; and in addition, the prestress is not required to apply on the negative bending moment area and a bent cap is omitted. A steel structure is not required for welding on site and the adjustability of the distribution position of the pier is favorable.

The invention discloses a road damage detection robot system. The system comprises a robot body system, wherein the robot body system comprises a mobile platform system and a detection system; the detection system is mounted on the mobile platform system; the detection system comprises a knocking and scanning detector, a lifting mechanism and a detector control system; the lifting mechanism is mounted on the mobile platform system; the knocking and scanning detector is mounted on the lifting mechanism; and the detector control system is electrically connected with the knocking and scanning detector. By adopting the detection system disclosed by the invention, intelligent detection can be realized; due to no need of manual operation, the accuracy of detection security and detection data can be improved; a plurality of lossless detection sensors are integrated, so that comprehensive evaluation of pavement and internal conditions of the pavement can be realized at one time, the detection efficiency is greatly improved, and the influence on road trafficability is also reduced.

The invention discloses an intelligent road surface autonomous detection device which comprises a vehicle body. A control system, a nondestructive detection system and an operation mechanism are arranged on the vehicle body. The operation mechanism is installed on the vehicle body. The nondestructive detection system is connected with the operation mechanism. The control system is electrically connected with the operation mechanism and the nondestructive detection system. The nondestructive detection system comprises resistivity meters. The operation mechanism comprises telescopic mechanisms. The resistivity meters are connected with the telescopic mechanisms. By the adoption of the intelligent road surface autonomous detection device, intelligent detection can be achieved, and due to the fact that no worker is needed for driving, the detection safety and the detection data accuracy are improved; and various nondestructive detection sensors are integrated, comprehensive evaluation of the condition of the road surface including the interior can be achieved at a time, the detection efficiency is greatly improved, and influences on the road passage performance are reduced as well.

The invention discloses a crawler-type intelligent automatic pavement detection device. The crawler-type intelligent automatic pavement detection device comprises a crawler-type vehicle body, wherein the crawler-type vehicle body is provided with a control system, a nondestructive inspection system and an operation mechanism; the operation mechanism is mounted on the crawler-type vehicle body; the nondestructive inspection system is connected with the operation mechanism; the control system is electrically connected with the operation mechanism; the control system is electrically connected with the nondestructive inspection system; the nondestructive inspection system comprises a resistivity meter; and the operation mechanism comprises a telescoping mechanism and the resistivity meter is connected with the telescoping mechanism. With the adoption of the crawler-type intelligent automatic pavement detection device disclosed by the invention, intelligent detection can be realized; the device does not need to be manually driven, so that the detection safety and the accuracy of detection data are improved; a plurality of types of nondestructive inspection sensors are integrated and comprehensive evaluation on pavement conditions (including inner conditions) can be realized in one step; and the detection efficiency is greatly improved and the influences on road passing are also reduced.

The invention relates to a road section pedestrian secondary crossing dynamic traffic signal control method. Aiming at pedestrian secondary crossing in a green wave coordination scene, a brand new logic control design is adopted, motor vehicle flow, motor vehicle headway and pedestrian conditions on roadside and road central safety islands comprehensively considered; motor vehicle crossing requirements, reduction of influence on green wave coordination are well balanced according to pedestrian crossing traffic requirements; pedestrian secondary crossing green lights are dynamically turned on, and the duration of the green lights are dynamically distributed; the influence on main road traffic flow can be reduced,and the safety and efficiency of motor vehicle passing and road section pedestrian secondary crossing are improved. A system for executing the control method is further designed correspondingly. The system can be quickly arranged at a target road position, and timely responds to and executes the designed method to ensure traffic safety.

The invention discloses an asphalt mixture, a preparation method of the asphalt mixture and a construction method for maintenance of an asphalt pavement. The asphalt mixture comprises asphalt, a surfactant, aggregates and mineral powder; the surfactant has a pH value of 9.5 plus and minus 1, an amine value of 400 to 500 mg / g and solid content of greater than or equal to 9.5 percent. The preparation method of the asphalt mixture comprises the following steps; mixing the mineral powder and the aggregates and heating to a temperature of 145 to 160 DEG C; heating the asphalt to a temperature of 145 to 160 DEG C; adding the surfactant into the heated asphalt, stirring and mixing; mixing the mixed asphalt and surfactant and the mixed and heated mineral powder and aggregates, stirring and in the mixing and stirring process, controlling the temperature of the mixture in the range of 135 to 150 DEG C. According to the asphalt mixture, not only is discharge of harmful gas in the rolling process reduced, but also energy consumption is reduced, and thus, the asphalt mixture is more environmental-friendly and safer for maintenance of the asphalt pavement; the construction method of the asphalt mixture, which is used for maintenance of the asphalt pavement, can also achieve the same technical effects.

The invention relates to a crosswalk traffic-light control method, which comprises the following steps that: (1) a control button is manually pressed; (2) a control system acquires traffic-state data of intersections from a traffic-light control system for the road intersections at two ends, analyzes the data, and determines a time segment with minimum vehicle flow of a road section within a set time range; and (3) in the time segment with the minimum vehicle flow within the set time range, a pedestrian-direction green light is controlled to be on, while a vehicle-direction red light is controlled to be on. The method can allow the pedestrians to pass under the circumstance that vehicles on the road is small in flow, thereby reducing the influence on the vehicles and overall road traffic conditions as much as possible while ensuring the passing of the pedestrians.

The invention provides a road intersection guiding device with public transportation stops. The road intersection guiding device comprises entrance lanes, exit lanes and guiding islands. Exclusive right-turn lanes communicating with the corresponding after-right-turn exit lanes are arranged on the right sides of an intersection and the corresponding entrance lanes. Each entrance lane comprises a social vehicle entrance lane body on the inner side and a mixed-traveling entrance lane body which is located on the outer side and used for allowing social vehicles and public transportation vehicles to pass through, wherein the mixed-traveling entrance lane body comprises a straight-traveling lane on the outermost side and a left-turn lane on the secondary outer side. The front end of each mixed-traveling entrance lane body is provided with a traffic sign used for dividing lane functions and a straight-traveling and right-turn vehicle interweaving area. Each guiding island is provided with a passenger waiting area of the corresponding public transportation stop, wherein the left side of the passenger waiting area is provided with a public transportation parking area located at a lane on the outermost side of the corresponding exit lane. According to the road intersection guiding device, through detailed design of the guiding islands and the public transportation stops, the space utilization rates of the guiding islands can be increased, the public transportation transfer distances of passengers are shortened, and influence, of parking of the public transportation vehicles, on the social vehicle traffic at the intersection is reduced.

The invention relates to a crosswalk traffic-light control device, which comprises a microprocessor and a traffic-light control module, wherein the microprocessor is provided with a communication module; the communication module communicates with a traffic control system of intersections at two ends of a road through a wired or wireless mode so as to acquire traffic-state data of the intersections at two ends, which is related to the road; according to preset road data and the related traffic-state data of the intersections at two ends, the microprocessor works out a time segment with minimum vehicle flow within a set time range, determines the time of a green light for allowing pedestrians to pass, and generates traffic-light control instructions; and the traffic-light control device is connected with the microprocessor through a signal line, and receives control signals output by the microprocessor to switch working states of traffic lights. The device can allow the pedestrians to pass under the circumstance that vehicles on the road is small in flow, thereby reducing the influence on the vehicles and overall road traffic conditions as much as possible while ensuring the passing of the pedestrians.

A system and method uses path information to project traffic information from flow- or IPFix-type messages onto one or more paths that may have been taken by packets corresponding to such messages. Traffic information from a message is projected from the router interface from which the message was received, along the path or paths the packets corresponding to the message may have taken, but only to the next router interface that provides such messages.

The invention discloses a soft foundation water jetting earth excavation construction technology. The soft foundation water jetting earth excavation construction technology includes the following steps that first, a foundation pit excavation sideline is measured, and steel sheet piles are arranged around the peripheral sideline for shoring; second, a sludge sucking pond is excavated at the central position of a foundation pit, the depth is properly 3-5m and the width is properly 5-8m; third, a high-pressure water gun is used for scouring a soil body into mud; and fourth, the mud is discharged into a settling pond with a sludge sucking pump, a booster pump and a conveying pipe, and clear water separated out is injected into the high-pressure water gun for recycling. Compared with the prior art, the soft foundation water jetting earth excavation construction technology has the advantages that on one hand, noise in the hydraulic excavation construction process is small; and on the other hand, construction is safe and convenient and construction cost is low.

The invention provides a driving and steering mechanism and a bicycle with the same. The driving and steering mechanism comprises a steering assembly, a control rod, a driving wheel and a ratchet wheel used for driving a corresponding wheel to rotate; the steering assembly comprises a front fork, an axle sleeve and a U-shaped connector, wherein the axle sleeve and the U-shaped connector are relatively fixed; a connecting rod at the top of the front fork penetrates through the axle sleeve and then is fixedly connected with the bottom of the U-shaped connector arranged above the axle sleeve; thelower end of the control rod is inserted into a U-shaped groove of the U-shaped connector, and the lower end of the control rod is connected with a rotary shaft transversely penetrating through the opposite side walls of the U-shaped groove; the driving wheel is mounted at one end of the rotary shaft and arranged on the outer side of the U-shaped groove; and the ratchet wheel is arranged below the front fork and coaxially mounted with the corresponding wheel. A driving mechanism and a steering mechanism are integrally designed, the size of a bicycle body is effectively decreased, convenienceis facilitated, traffic influences on other people are reduced, and the bicycle can assist fitness.

The invention relates to a ground wire overhead vehicle special for a large span. The ground wire overhead vehicle is composed of bearing pulleys (1), a working platform (2), wire hanging pulleys (3), a rope containing device (4), a ground wire (5) and a pulling rope (6); the working platform (2) is installed at the right side; the rope containing device (4) is installed at the left side; two sets of bearing pulleys (1) are installed on the working platform (2); the working platform (2) and the rope containing device (4) are connected through the pulling rope (6); two sets of wire hanging pulleys (3) are installed over the pulling rope (6); and the ground wire (5) is installed over the working platform (2). The ground wire overhead vehicle special for the large span disclosed by the invention has the benefits that: the construction time is saved; the noise nuisance and environmental pollution problems due to usage of pulling and tensioning equipment can be reduced; all parts are installed in an overhead wire outgoing manner; and influence of construction on passage of the Yangtze river waterway is reduced.

The invention relates to a foundation pit covering and excavating structure for construction on the traffic side under a bridge. The foundation pit covering and excavating structure comprises steel pipe piles, bailey beams, I-shaped steel, a steel plate, an asphalt surface layer, guardrails and secant piles. A steel pipe pile is arranged in the foundation pit under the bridge and is formed by connecting a plurality of short steel pipes with lock catches through flanges; secant piles are arranged in a foundation pit outside the bridge, the steel pipe pile on the outermost side is in embedded lap joint with the plain concrete pile of the secant piles, and a grouting pipe is welded to the lap joint position of the steel pipe pile on the outermost side and the plain concrete pile; grooves are formed in the tops of the steel pipe piles, and the bailey beams are placed in the grooves of the steel pipe piles on the two sides of the foundation pit. The method has the beneficial effects that the under-bridge road is closed, one side is subjected to supporting structure construction, the other side passes, and the influence of construction on passing can be reduced to the maximum extent. A cover excavation method is adopted for foundation pit construction, traffic can be rapidly achieved through composite structures such as bailey beams, I-shaped steel, steel plates and asphalt, the foundation pit is excavated on the lower portion while traffic is conducted on the upper portion, and the construction progress is not delayed while traffic is guaranteed.

The invention relates to a pedestrian traffic light and motor vehicle control method, including the following steps: (1) a control button is manually pressed; (2) a control system acquires traffic state data of the crossing from traffic light control systems of crossings at the two ends of the road, the data is analyzed, and a time period with minimal traffic flow of the road in a preset time range is judged; (3) in the time period with minimal traffic flow, the green light in pedestrian direction is turned on while the red light in motor vehicle direction is turned on; (4) at or before the moment that the green light in pedestrian direction is turned on, a vehicle barrier cross bar arranged on the ground is lifted up to stop the motor vehicles from entering the pedestrian crossing. By adopting the method, pedestrian can be allowed to pass while the motor vehicle flow on the road is small, thus reducing the influence on motor vehicles and the whole road traffic condition while ensuring the passing of the pedestrian.

The invention relates to a spliced bridging structure and a building method thereof. The spliced bridging structure comprises at least one group of arch bridge structures and slope structures, wherein the slope structures are arranged at the front and rear parts of the arch bridge structures and are correspondingly connected with the arch bridge structures. The building method comprises the following steps: (a) fixing at least one group of arch bridge structures at a transverse channel; (b) sending oblique plate structures in quantity correspondence with the arch bridge structures to the front and rear sides of the arch bridge structures, and fixing; (c) forming a groove in a pavement, and fixedly embedding a limiting structure into the groove; (d) pouring cement into gaps among the groove structure, the arch bridge structures and the oblique plate structures, and paving asphalt; and (e) directly digging a sunken and arc-shaped longitudinal channel in the transverse pavement. The spliced bridging structure and the building method have the advantages that (a) the construction speed is high, so that the influence to the traffic is reduced; (2) the structure is simple, the cost is relatively low, the integral strength is improved by virtue of a steel structure, and the strength is improved by the pouring of concrete; and (3) the urban traffic pressure can be effectively alleviated, and the situation of traffic jams can be avoided or reduced.

The invention discloses a vibration type intelligent navigation apparatus, which comprises a mobile phone having a navigation software and a Bluetooth function, and a pair of glove bodies, wherein the two glove bodies are respectively provided with a Bluetooth receiving module, a microcontroller and a vibration module, the mobile phone transmits a navigation left / right-hand rotation signal to the Bluetooth receiving modules on the corresponding left / right glove through the Bluetooth, the Bluetooth receiving module inputs the left / right-hand rotation signal into the corresponding microcontroller through the output terminal, and the microcontroller sends a vibration control signal through the output terminal to control the corresponding vibration module to vibrate so as to prompt the driver to perform the corresponding left / right-hand rotation. According to the present invention, the navigation prompt of the left / right-hand rotation is performed through the vibration of the left / right glove, such that the influence of seeing-the-screen or wearing of the headphones on the driving can be reduced, and the accident occurrence rate is reduced.

The invention relates to a traffic accident processing method and system based on artificial intelligence and computer vision. The method comprises the following steps: obtaining the identity information of a starting person who starts traffic accident processing, determining an initial accident vehicle according to an obtained traffic accident image after the identity information is obtained, and then obtaining a target region of the traffic accident image, and performing ground lane line recognition on the target region, determining the traffic accident liability of each initial accident vehicle according to the initial accident vehicles and the target ground lane line, and finally integrating the license plate numbers of the initial accident vehicles to obtain a traffic accident affirmation data packet. Therefore, the traffic accident handling method provided by the invention is an automatic handling method, after a traffic accident occurs, a traffic accident liability affirmation result of a related vehicle can be directly obtained according to data processing without waiting for a traffic police, the traffic accident handling efficiency is improved, the traffic influence degree is reduced. Therefore, the possibility of secondary traffic accidents is reduced, and the traffic safety is improved.

The invention discloses a greening tree cultivation method and a support stand of the greening tree cultivation method, and relates to the technical field of urban greening construction. The greeningtree cultivation method comprises the following steps: S1, carrying out preparatory operation, namely preparing necessary equipment, and performing treatment on a seedling; S2, carrying out hole digging operation, namely digging a plating hole in an area to be planted; S3, laying cultivation soil, namely laying nutrient soil inside the plating hole; S4, hoisting the seedling into the plating hole,namely hoisting the seedling by using hoisting equipment, and inserting roots of the seedling into the plating hole; S5, carrying out supporting operation, namely tightly holding the seedling by thesupport stand so as to have the seedling supported, thereby allowing stable standing of the seedling in the plating hole, and removing the hoisting equipment; and S6, carrying out back-filling operation, namely filling soil back into the plating hole, tamping the filled soil, and completing seedling planting. The greening tree cultivation method has the advantages of being capable of realizing quick separation of the seedling from the hoisting equipment, shortening dependence time of seeding planting on the hoisting equipment, and weakening influence on a road.

The invention discloses a wide-power-spectrum multi-stage injection hydrogen circulation system which mainly comprises a high-pressure gas supply device, a multi-stage injection device, a control module and an electric pile valve group. High-pressure hydrogen is decompressed through a high-pressure gas supply device and led to a multi-stage injection device, the multi-stage injection device is composed of a plurality of single-stage injection ejector assemblies, each single-stage injection ejector assembly is composed of a hydrogen ejector set, a pressure transmitter and an ejector, and a control module controls the multi-stage injection ejector assembly by collecting operation parameters of the pressure transmitters and an electric pile. The control module is used for calculating the hydrogen flow required by the electric pile according to the power load, and selectively starting the stage number of single-stage injection ejectors in the multi-stage injection device and adjusting the pulse width of a hydrogen injector group through a control method of the control module so as to ensure that the fuel cell system can effectively operate at low, medium and high wide power load working condition points; and meanwhile, the problem that residual condensed water of the ejector is frozen when the environment temperature is low due to the fact that residual water vapor cold condensed water in the ejector cannot be discharged is solved.

The invention relates to the field of municipal facilities, in particular to a sunken green belt isolation fence which comprises two rows of outer side fences and a greening area arranged between the two rows of outer side fences, a row of spray head rods are arranged at the positions, close to the outer side fences, of the greening area, and the upper end of each spray head rod communicates with an inclined upper inclined rod; the end, away from the spray head rod, of the upper inclined rod is away from the greening area, the spray head rod and the upper inclined rod are provided with a plurality of water mist spray heads for spraying water mist towards the lane to achieve dust falling treatment, and the water mist spray heads can spray water mist towards the lane to reduce flying dust on the lane, so that the flying dust is not prone to causing large influence on a sidewalk.