47results about How to "Implement redundant functions" patented technology

The invention provides a protection method of a modular multi-level current converter. The current converter comprises a sub-module controller and a sub-module; when the sub-module breaks down, the sub-module controller monitors and acts on the sub-module, so as to remove the failed sub-module timely, and the normal operation of the modular multi-level current converter can be ensured. According to the protection method provided by the invention, the overall current converter is not exited due to the fault of the sub-module, meanwhile, the sub-module is not integrally damaged due to the fault of the components in the sub-module, thereby greatly improving the utilization of the modular multi-level current converter and improving the stability of the system operation.

The invention relates to a train smoke alarm communication method based on an independent module combination 3U case structure, and the method comprises the steps: recognizing a carriage signal through an IO board card external address line, and extracting the detector configuration; enabling a detector to collect temperature information and smoke and thick fog information, and transmitting the information to a CPU board card for processing; enabling the CPU board card to judge the collected information, and outputting alarm information; enabling the CPU board card to transmit alarm information to an HMI display screen of a driver's cab after alarm; enabling the IO board card to cut off the signal output of a vehicle safety loop, transmitting the alarm information to the HMI display screen of the driver's cab, and enabling a red alarm indicating lamp of a DISP board card to be turned on; and enabling a DS board card, an Enet board card and a wireless board card to collect, store and upload the temperature information, the smoke and thick fog information and alarm information. When the detector communicates with a CAN board card, the method carries out the progressive addition or subtraction calculation of a CAN frame address of the detector through the forwarding mechanism of the detector. When the detector receives CAN frames with different addresses, the addresses of response frames are also different, thereby improving the configurability of a system.

The invention discloses a test platform of a controller area network (CAN)-based light rail vehicle network control system, which comprises a driver console A, a driver console B, a control cabinet A, a control cabinet B and a subsystem simulation cabinet, wherein the driver consoles A and B have the same structure; the control cabinets A and B have the same structure; and the driver console A, the control cabinet A, the subsystem simulation cabinet, the control cabinet B and the driver console B are connected by a CAN. The test platform can greatly shorten the debugging time of the vehicle network control system so as to shorten the time of delivering vehicles to users by original equipment manufacturers and finally realize the advanced delivery or operation of the vehicles. The test platform and a research platform are provided for the CAN technology-based control system, are favorable for the popularization and application of a CAN system in China and further promote the diversified development of the light rail vehicle network control system in China.

The invention relates to an alternating current transmission system, in particular to a vehicle alternating current transmission system, and solves the defects and the problems of a transmission way of an existing heavy track car. The system comprises a traction system and an auxiliary system, wherein the traction system consists of a first traction system and a second traction system; the first traction system and the second traction system have the same structure and independently comprise a diesel engine, a permanent magnet synchronous generator, a four-quadrant traction rectifier, a traction inverter and an asynchronous traction machine; the auxiliary system comprises an auxiliary system direct current bus which is connected with an auxiliary inverter; the direct current bus of the rectifier of the first traction system is connected with the auxiliary system direct current bus through a first DC/ DC converter and a first fling-cut switch; and the direct current bus of the rectifierof the second traction system is connected with the auxiliary system direct current bus through a second DC/ DC converter and a second fling-cut switch. The alternating current transmission system isespecially suitable for a GCD-1000II heavy track car and is also suitable for other vehicles.

The invention discloses a method of making records in a synchronous way for a work master station and a spare master station. Steps included are as follow: a SOE work master station sends a hardware synchronous pulsing signal to a SOE spare master station; the SOE work master station sends an absolute time required to send the hardware synchronous pulsing signal to the SOE spare master station; the spare master station calculates time difference (Delta t) between the time (T1) of receiving the hardware synchronous pulsing signal and the absolute time required to send the hardware synchronous pulsing signal. The spare master station judges the time difference (Delta t). When the absolute time difference (Delta t) is beyond a specified limit to an extent, the SOE spare master station perform time compensation; the SOE work master station sends the original record from a SOE slave station to the SOE spare master station. The invention can help the work master station and the spare master station make records in a synchronous way, realizing a redundant function of the SOE spare master station for the SOE work master station.

The invention provides an AC/DC hybrid electric power system for an aeronautical multi-electric engine and a design method thereof. The AC/DC hybrid electric power system for an aeronautical multi-electric engine comprises two parallel built-in variable frequency AC starters/generators; the output end of each built-in variable frequency AC starter/generator is connected with an AC/DC converter; the output end of the AC/DC converter is connected with a DC bus; the DC bus is connected with a DC/AC converter and a bidirectional DC/DC converter; the DC/AC converter is connected with an AC bus is used as an output; the bidirectional DC/DC converter is connected with a storage battery; both the DC bus and the alternating current bus are connected with a load; the AC/DC converter is an autotransformer active filter rectifier; and the DC/AC converter is an inverter adopting the virtual synchronous generator technology. The AC/DC hybrid electric power system for an aeronautical multi-electric engine in the invention solves the problem that the power generation capacity of the conventional power system of the existing aeronautical engine cannot meet the operating requirements of the aeronautical multi-electric engine.

The invention discloses a rail transit train door redundancy network system based on U-shaped network topology, includes vehicle-level Ethernet network units with matching number of cars, each vehiclelevel Ethernet network unit includes two main door control units and a plurality of local door control units, realizing the Ethernet network redundancy function of the rail transit train door, so that if a single point of failure occurs on an Ethernet network, no packet loss occurs and the network fail recovery time is 0 ms, effectively improving the safety and reliability of train door network.The invention only occupies two Ethernet network ports of the train Ethernet switch, and the whole vehicle door network adopts the U-shaped network topology structure to connect. Compared with the traditional star network topology, the invention can save the number of the Ethernet switch and the network cable, greatly reduces the vehicle manufacturing cost, and has good application prospect.

The invention discloses a redundant distributed fiber optic line-type temperature-sensing fire detection system, which comprises a plurality of distributed fiber-optic line-type temperature-sensing fire detector host units and temperature-sensing optical fiber units with redundant functions. The invention also discloses a redundant distributed optical fiber line-type temperature-sensing fire detection method. The redundant distributed optical fiber line-type temperature-sensing fire detection method and system of the present invention do not need to add any hardware in the redundant design schemes of underground utility tunnels, urban rail transit tunnels, highway tunnels and other important application places. The investment cost and external technical means can realize the redundancy function of the system, and can effectively solve the problem of breakpoints in the optical fiber. It can also continue to detect the ambient temperature at both ends of the breakpoint and the spread speed of the fire, and when a certain detection host fails, The detector hosts connected to its neighbors will start redundant detection, which effectively improves the reliability of the distributed optical fiber line type temperature-sensing fire detection system, saves investment costs and improves efficiency.

The invention relates to an assembly structure and an assembly method of a double-power-assisted mechanism of a recirculating ball steering gear. The invention belongs to the field of commercial vehicle electric power steering gears. The double-power-assisted mechanism is adopted on the recirculating ball type mechanical steering gear, and due to the fact that the double-power-assisted mechanism is adopted, when the output torque is low, the transmission ratio of the speed reducing mechanism can be reduced, and therefore the boundary dimension of the speed reducing mechanism is reduced; or the transmission ratio of the reducing mechanism is kept unchanged, the motor output torque requirement is reduced, and the motor cost and the motor appearance size can be greatly reduced. When the output torque is high, the requirement for the transmission ratio of a single speed reducing mechanism can be lowered, and the problems that the transmission ratio of a super-large speed reducing mechanism is caused by the requirement for the output torque, the appearance size is large due to the super-large transmission ratio of the speed reducing mechanism, and the strength of the speed reducing mechanism is sacrificed for reducing the appearance are solved.

The invention is applicable to the field of power supplies, and provides a cold backup switching method and circuit for a redundant power supply, and the redundant power supply. The cold backup switching method comprises the steps of sampling output total current, an determining the redundant power supply efficiency according to the current sampling value; judging whether the redundant power supply efficiency is lower than half load; if so, outputting a first cold backup control signal or a second cold backup control signal; disconnecting a first branch circuit according to the first cold backup control signal or the second cold backup control signal, and controlling the power supply to be output through a second branch circuit; or otherwise, outputting a first working control signal or a second working control signal; closing the first branch circuit according to the first working control signal or the second working control signal, and controlling the power supply to be output through the first branch circuit, wherein the output voltage of the second branch circuit is less than that of the first branch circuit. When the power supply efficiency is lower than the half load, the power supply is controlled to enter the cold backup state to improve the efficiency of the power supply; and when the normal power supply is switched to the backup power supply, voltage output is always kept without requiring a large capacitor for buffering, so that the redundant power supply is high in reliability and low in cost.

The invention discloses a variable pitch system of a wind generating set. The variable pitch system of the wind generating set comprises at least one paddle, paddles are respectively connected with a hub, the hub comprises a hub internal gear, an A encoder is arranged in the hub, the A encoder is connected with a master control, an approach switch is further arranged in the hub, the approach switch is rightly opposite to the inner gear face of the hub internal gear, and the approach switch is connected with the master control. Due to the fact that a B encoder used in the prior art is replaced by the approach switch in the variable pitch system of the wind generating set, redundancy function of encoders can also be achieved, and meanwhile cost is reduced.

The invention relates to a magnetic levitation guide control simulation system, on one hand, force decoupling is realized through mechanical design, and a single guide unit is independent from the system and is considered independently, so that a model structure is simplified; on the other hand, the coupling relation (information interaction relation) between the adjacent guide control loop and the opposite guide control loop is comprehensively considered, and the gaps between the suspension device (maglev train) and the tracks on the two sides are kept near a rated value (within a preset range) through simulation control, so that the fluctuation range of the gaps is within an allowable value; the method not only considers closed-loop control loops of respective suspension points, but also considers information interaction between adjacent and opposite loops, is strong in simulation authenticity, high in accuracy and strong in matching performance, and also can realize a redundancy function.

The invention provides a dual-communication system based on ARCNET and Ethernet. The system comprises a processing module, an Ethernet communication module, at least two ARCNET communication modules, and photoelectric conversion modules which are in electrical connection with the ARCNET communication modules in a one-to-one manner. The processing module comprises a microcontroller, an external extended SDRAM and an external extended Flash memory, wherein the external extended SDRAM and the external extended Flash memory are electrically connected with the microcontroller. Each ARCNET communication module is electrically connected with the microcontroller, and the microcontroller is electrically connected with the Ethernet communication module. The system achieves the mutual communication between the ARCNET network and the Ethernet network.

The invention relates to the field of power electronics, and particularly provides a parallel module unit applied to a power electronic transformer, which comprises a power module (IGBT), a power unit board, a thermal management assembly, a flexible connection assembly, a fusing loop assembly and a module shell, adopts SCR-DAB topology, and adopts a parallel connection mode to share a direct current bus by multiple modules. The problem of insufficient current-carrying capacity of a single module is solved, and bidirectional energy flow is realized. The modularization degree of internal components is high, and production is convenient; due to the design of a guide rail type base, electrical connection can be rapidly achieved, and the maintainability is high; a flexible socket connection mode is adopted, so that a hot plug function is realized; due to a double-air-duct structure, the overall heat dissipation efficiency of the module is high; the size and weight are small and the power density is high; and a sheet metal part and an insulating part are matched for use, so that the mechanical performance and the electrical performance are effectively guaranteed, and the safety of the module unit is high.