34results about How to "Accurately judge the fault" patented technology

The invention relates to a fault detection and positioning method for a rotary rectifier of an aeronautical brushless electric excitation synchronous motor. Through Euler distance and the proximity principle, a condition that whether a fault occurs and a type of the fault are judged, then an upper arm fault or a lower arm fault is judged through a sum of a maximum value and a minimum value of fault phase current in one cycle, and the fault diagnosis and positioning can be realized. The method has the advantages that (1) whether the rotary rectifier is failed can be accurately determined, and (2) a diode with an open circuit can be accurately positioned.

The invention relates to a commutation timing determination method and a commutation system for three-phase unbalanced commutation, including: converting a multi-objective optimization problem into a single-objective optimization model through a constraint method, combining genetic algorithm and simulated annealing algorithm to obtain The optimal solution set of the single-objective optimization model is determined, and the best solution in the optimal solution set is determined as the commutation timing, and based on the commutation timing, the load to be switched and its switching sequence are determined for switching. The invention transforms multiple objectives into one objective, improves calculation efficiency, and controls the number of current optimal solutions generated by adjusting breakpoints of constraint conditions, thus having strong objectivity. Secondly, the combination of genetic algorithm and simulated annealing algorithm helps to quickly and accurately obtain the global optimal solution, effectively avoid the safety risks caused by three-phase imbalance, and improve the level of power grid operation planning. In addition, the present invention can analyze the three-phase unbalanced state of transformers of different types and capacities, and has a wide range of applications.

The invention discloses a tail gas treatment system and its DPF temperature control system and control method, including a catalyst conversion device, the catalyst conversion device includes a tail gas channel, a conical constriction, a DOC and a DPF, and an external hydrocarbon is connected to the tail gas channel For the injection device, a first temperature sensor is installed upstream of the DOC, a first differential pressure sensor is installed upstream of the DOC, a second temperature sensor and a third temperature sensor are respectively installed upstream and downstream of the DPF, and a sensor for measuring the outlet of the DPF is installed on the DPF. The second differential pressure sensor for the pressure and the differential pressure passing through the DPF; the controller is electrically connected to the internal combustion engine, the first temperature sensor, the second temperature sensor, the third temperature sensor, the first differential pressure sensor and the second differential pressure sensor. According to the hydrocarbon conversion efficiency of DOC and DPF, the present invention can accurately judge whether there is a fault in the tail gas treatment system, and prepares to determine the type of the fault for maintenance, thereby shortening the time for judgment of the fault.

The invention discloses an external hydrocarbon jetting device which comprises a control manifold, a fuel oil electromagnetic valve, a fuel injector, a pressure sensor, a buffer device and a controller. The control manifold is provided with four ports; the ports communicate mutually so as to form a hollow chamber; the controller is electrically connected with the fuel oil electromagnetic valve, the fuel injector and the pressure sensor; one port of the control manifold is connected with a hydrocarbon source through the fuel oil electromagnetic valve; one port of the control manifold is connected with the fuel injector; one port of the control manifold is connected with the pressure sensor; one port of the control manifold is connected with the buffer device; the controller controls the fuel oil electromagnetic valve to power on so as to switch on; the hydrocarbon source enters the control manifold through the fuel oil electromagnetic valve, flows to the fuel injector and is injected; the pressure sensor detects the hydrocarbon pressure in the control manifold and back-feeds to the controller; and the controller controls the flow of injected hydrocarbon compounds through controllingthe power-on and power-off time of the fuel injector. According to the external hydrocarbon jetting device provided by the invention, a temperature control performance in a tail gas treatment systemcan be improved, and meanwhile, the warranty cost is reduced.

A pump truck dredge control system comprises: a material discharging height collection unit (101) for collecting information about a current material discharging height of a pump truck; a pumping status collection unit (102) for collecting current pumping status information of the pump truck; a processor (104) for presetting a pumping status threshold corresponding to a material discharging height, determining the current pumping status threshold based on the information about the current material discharging height of the pump truck, comparing the current pumping status information and the current pumping status threshold, determining a pipe blockage fault when the current pumping status information is larger than or equal to the current pumping status threshold, and sending an action signal to a control element (106); and the control element (106) for performing a corresponding operation based on the action signal to remove the pipe blockage fault. Further disclosed are a pump truck dredge control method and a pump truck. The pump truck dredge control system, control method, and pump truck can accurately determine a pipe blockage fault, give a warning effectively, and take an effective measure to solve a pipe blockage fault.

Provided in the invention is a detection and protection system for a water cooling fault of tumour microwave ablation. A tumour microwave ablation water-cooling system is a circulating system formed by successive series connection of a water containing device, a peristaltic pump, and a microwave ablation antenna needle by a cooling circulating pipeline; and the microwave ablation antenna needle is connected with a microwave host by a microwave output coaxial cable. The detection and protection system comprises a water flow photosensitive receptor for detecting a water flow signal in the cooling circulating pipeline, an alarm device for carrying out sounding alarming when the water flow photosensitive receptor can not feel a water flow signal, and a control unit for cutting off a microwave host circuit when the water flow photosensitive receptor can not feel a water flow signal. According to the invention, the water flow situation in the cooling circulating pipeline is detected to determine whether a fault occurs at the tumour microwave ablation water-cooling system accurately, thereby guaranteeing safety implementation of the microwave thermal ablation operation. The system having advantages of simple structure and low cost is suitable for popularization and application.

The invention relates to vehicle diagnosis system and method based on an internet C / S mode. The method comprises the steps of: 1, establishing a connection between a terminal user and a server; 2, carrying out authentication on the terminal user and the server; 3, determining a vehicle type by the terminal user, sending the vehicle type information to the server to obtain a corresponding vehicle diagnosis program; 4, operating the diagnosis program, carrying out function diagnosis on the vehicle; 5, sending information to the server to obtain core library data required by the corresponding function; 6, computing the obtained core library data and displaying a result; and 7, judging whether ending the operation or not, if not, executing the next function diagnosis. The system is a C / S forming mode based on a certain central center on internet as a core, and has simple construction and convenient use. The method is convenient for uniform maintenance for the diagnosis core data, so that the fault of the vehicle can be accurately judged by using newest diagnosis data at any time as long as the server is linked.

The invention relates to an aviation three-stage synchronous motor rotating rectifier fault detection and fault locating method, which is characterized by judging whether a rotating rectifier has fault through distortion rate residual errors of waveform, and if having fault, judging whether the fault is short circuit or open circuit or upper arm diode or lower arm diode fault through the sum valueof the maximum value and the minimum value of phase current of a three-phase rotor of a main exciter, and thus the method can realize a fault diagnosis and locating function. The beneficial effects are that the method can accurately judge whether the rotating rectifier has fault and can accurate locate which diode has short circuit or open circuit.

The invention relates to an AC bus differential protection method, which belongs to the technical field of flexible direct current transmission. The present invention proposes an AC bus differential protection method aiming at the topological structure of connecting the AC bus on the variable valve side in parallel with three-phase reactors and the configuration of its measuring points. Then calculate the current of each phase of the grounding reactor according to the grounding resistance and the actual parameters of the reactor; calculate the difference based on the collected current of each phase on the valve side, the current of each phase on the valve side of the starting circuit and the calculated current of each phase of the grounding reactor The absolute value of the current; judge whether the current difference is greater than the protection setting value, if greater, start the AC bus differential protection. The invention can quickly and accurately judge faults and effectively protect the whole system.