68results about How to "Guaranteed to minimize" patented technology

The invention discloses a four-wheel steering vehicle rollover prevention system and a control method thereof. The four-wheel steering vehicle rollover prevention system comprises a sensor module, a drive-by-wire rear-wheel steering module, a front wheel differential brake module, a rollover evaluation unit, a route planning unit and a controller ECU; and the sensor module comprises a vehicle velocity sensor, a steering wheel angle sensor, a vehicle body rolling angle velocity sensor, a vehicle body rolling angle sensor, a yaw velocity sensor and an acceleration sensor. The rollover prevention control is carried out through the front wheel differential brake module, and the original driving intention of a driver is kept through the rear-wheel steering module, so that a secondary accident possibly resulting from the traditional rollover prevention control without considering the driving intention is avoided.

The invention discloses a distributed optimal cooperative fault-tolerant control method based on self-adaptive dynamic planning. The distributed optimal cooperative fault-tolerant control method comprises the steps of: firstly, constructing a communication topology of a multi-agent system by means of communication links among agents, and representing the communication topology by a directed graphG=(V, E, A); secondly, establishing a local domain consistency error equation, and defining a failure-free cooperative control input quantity of the agent vi as ui based on an optimal control theory and a minimum value principle, so as to obtain a distributed optimal cooperative control law; thirdly, executing the distributed optimal cooperative control law; and finally, designing a distributed optimal cooperative fault-tolerant control law of the agents. The distributed optimal cooperative fault-tolerant control method can overcome the shortcomings of the existing nonlinear multi-agent systemfault-tolerant control method, and has a good application prospect in the fault-tolerant control of UAV formation.

The invention discloses a method for classifying silicon carbide micro powder and classifying equipment of the method, which belong to the technical field of classification of micro powder. The method mainly includes steps that the silicon carbide micro powder sequentially enters at least two classifying machines which are serially connected, each classifying machine is provided with a self-suction sealing device, the classifying precision of each downstream classifying machine is higher than that of the adjacent upstream classifying machine, a cyclone collector is connected with the tail-end classifying machine and collects sorted silicon carbide micro powder; a bag dust collector collects waste discharged from the cyclone collector, and a system is powered by an induced draft fan disposed on a downstream of the bag dust collector. By the aid of the method and the classifying equipment, technical problems that in the prior art, the classifying precision of silicon carbide micro powder is low, extraction rate of fine powder is low, distribution of granularities of finished products is wide are solved. In addition, the method and the classifying equipment are widely applied to finely classifying silicon carbide grains.

An engine control method for reducing exhaust gas during cold start and idling of an automobile. The method is divided into four stages: 1. Turn on the ignition device switch to enter the starting state, control the amount of inhaled air to make the air-fuel ratio become lean, and control the engine to be at No-load state; 2. The engine starts to start, and the second stage of controlling the air-fuel ratio and delaying the ignition timing according to the engine speed and engine load; 3. If the engine speed formed by the first and second stage control is greater than the target speed, it will enter after the start In the no-load mode, output the air volume according to the detected rotational speed and cooling water temperature, and at the same time control the air-fuel ratio and the third stage of delayed ignition timing according to the changing engine rotational speed and load; 4. In the third stage, control the formed engine rotational speed. If the rotational speed is less than the target speed, the current shifting stage is converted into a driving shifting stage, and enters the driving mode, and the fourth stage of engine control is formed according to the corresponding mode.

The invention discloses an effective layering error locating method. The method comprises the following steps: initializing an abnormal value set V by use of a value of a fault assert sentence in an error path; then selecting an abnormal value v from the set V and calculating the unsatisfied weakest precondition of the abnormal value v; calculating the generation reason c of the abnormal value v; judging whether c contains an error sentence or not, if yes, stopping the algorithm, otherwise, starting from c, identifying possible other abnormal value set V' by virtue of data and control denpendency, and adding abnormal values in the set V' into the set V; iterating the above steps till finding the error sentence containing reason; finally outputting the error sentence containing minimal reason and transferring the abnormal value generated by the reason to a reason set through which a fault assertion sentence passes. The effective layering error locating method disclosed by the invention can be used for assisting debugging personnel in executing error locating, and further providing effective information to assist the debugging personnel in understanding the error formation reason and further to assist the debugging personnel in repairing the error.

The invention provides a structure for preventing a pump from being damaged by liquid freezing in the pump in an SCR (Selective Catalytic Reduction) system. The structure comprises a pump body; a pressure sensor mounting cavity is formed in the upper portion of one side surface of the pump body; a pressure sensor liquid inlet runner is formed in the pump body; the pump body is further provided with a first liquid inlet channel which is in series connection with a main runner of the SCR system; the first liquid inlet channel is horizontally arranged; an inlet of the first liquid inlet channel is in a horn shape with the opening facing outwards; a groove is formed in the inner wall of the inlet of the first liquid inlet channel; a first elastomer is embedded into the groove. By means of the structure for preventing the pump from being damaged by liquid freezing in the pump in the SCR system, as the runners are optimized, it is guaranteed that the liquid residuals in the pump body are minimized, the expansion space of the liquid is enlarged, and it is guaranteed that the pump body cannot be damaged by liquid freezing; the cost is reduced; the working stability of the pump body is guaranteed; products have certain reliability.

The invention discloses a two-stage power distribution network post-disaster first-aid repair scheduling and load recovery collaborative optimization method and system. The method comprises the following steps: evaluating element damage conditions of a power distribution system; partitioning the fault points; carrying out preliminary recovery by using the distributed power supply, establishing a nonlinear programming model of the preliminary recovery, obtaining a linearized network reconstruction model, and solving to obtain a load recovery result of a first stage without considering a maintenance process as an initial recovery result; solving a collaborative optimization model of first-aid repair personnel allocation and load recovery by taking the maximum load recovery amount and the minimum recovery time as targets to obtain a network reconstruction time sequence change process, a first-aid repair personnel advancing line and a load recovery sequence result of a second stage considering maintenance scheduling; and as a final result for guiding the operation personnel to carry out post-disaster recovery, carrying out collaborative optimization. The post-disaster recovery capability of the power distribution network is improved, the downtime and the economic loss are reduced, and the recovery capability of the power distribution system is enhanced.

The invention relates to a complex network optimization estimation method with stochastic coupling. The invention solves the problem that the existing state estimation method can not simultaneously process a stochastic occurrence coupling complex network with measurement loss phenomenon and inaccurate occurrence probability, As a result, the accuracy of estimation performance is low, as well as has the problem of low estimation performance accuracy when transmission data loss, transmission failure and coupling node failing to receive other node information occure at the same time. The processis as follows: 1. The dynamic model of stochastic coupling delay complex network is established; 2, state estimation of the dynamic model under the event-triggered protocol is carried out; 3, sigma i,k+1 | k is calculated; 4, Ki , k+1 are calculated; 5, xi,k+1|k=1 is obtained to judge whether k+1 equals to M, if k+1 < M, 6 is executed, otherwise the process is ended; 6, sigma i, k+1 | k+1 is calculated; k=k+1, 2 is executed until k+1=M is satisfied. The invention is used in the field of complex network optimization estimation.

The invention discloses a form vector-based reduction method for a multi-input multi-output truth table, and belongs to the technical field of logic circuit optimization. The technical problem to be solved is to provide a form vector-based reduction method for a multi-input multi-output truth table. The technical scheme for solving the technical problem comprises the following steps: 1, converting a truth table into a decision form background; 2, solving all single-attribute non-zero form vectors according to the conditional form background and the decision form background, and respectively storing the vectors into a conditional form vector set and a decision form vector set; 3, for any conditional form vector and decision form vector, if a rule reduction condition is met, calculating a heuristic operator of the corresponding conditional form vector, and storing the conditional form vector completing the rule extraction operation into a redundant form vector set. The method is used for optimizing the logic relation between the input and the output of the digital logic circuit.

The present invention discloses a data transmission control method. The method comprises the following steps: when a receiver monitors an escape character on a transmission channel, determining whether a character immediately following the escape character is a starting character; when it is determined that the character immediately following the escape character is the starting character, receiving frame information after the starting character; when it is determined that the frame information transmission is ended, determining whether frame data formed by the frame information are correctlyreceived, wherein when it is determined that the frame data are correctly received, returning confirmation receipt information to a sender. The invention further discloses a data transmission controlapparatus and a computer readable storage medium. By adoption of the data transmission control method, minimization of frame data bytes of data transmission is achieved while ensuring complete transmission of data by setting a structure of simple and complete frame data, and by using such a simple frame structure, simultaneous ensure efficient and reliable transmission of data can be ensured at the same time.

The invention belongs to the technical field of automatic driving of agricultural machinery, and particularly relates to an unmanned turning method for agricultural machinery. The method comprises thespecific steps of S1 advancing an operation straight line section 1: carrying out straight line driving in which the driving direction is parallel to the road direction; S2 advancing an arc section 2; S3 reversing a straight line section 3; S4 advancing an arc section 4; and S5 advancing an operation straight line section 5. The agricultural machinery is unmanned, and automatic turning control isneeded in the ground. According to the scheme, the Euler screws are used for planning the arc sections, the automatic turning path of the agricultural machinery is in a cross type, the arc sections are in a sectional type, the Euler screws are used for planning the front sections and the rear sections, and the minimum turning radius of a vehicle is used for planning the middle sections, so that the minimization of the groundspace is guaranteed, and the curvature continuity is guaranteed; and therefore, agricultural machinery turning control can be carried out strictly along with the path, andthe agricultural machinery is prevented from deviating from the planned path.

The invention relates to a space-ray-tracing-based method for designing a secondary mirror hood and a square-tapered extinction cone. The method comprises: step one, establishing a Cartesian rectangular coordinate system used during a design process; step two, establishing auxiliary light in a meridian plane and a sagittal surface and carrying out calculation to obtain a boundary of a square-tapered main mirror central-hole extinction cone; step three, determining the position and configuration of the tail end of the square-tapered main mirror central-hole extinction cone; step four, definingan initial structure of a secondary mirror hood; step five, constructing a spatial auxiliary ray and carrying out calculation to obtain the position and configuration of the front end of a square-tapered extinction cone; step six, setting a point light source set at the edge of a conical surface, carrying out ray tracing, carrying out statistics of light source numbers with light leakage possibility, and increasing the size of the conical surface correspondingly; step seven, determining final spatial positions and three-dimensional configuration of the tail end and the front end of the square-tapered main mirror central-hole extinction cone; and step eight, carrying out calculation to obtain three-dimensional configuration of the secondary mirror hood.

The invention discloses a privacy protection distributed computing method and system for dynamically loading a code library. The invention relates to the field of cloud platform distributed computingand cloud user privacy protection. The confidentiality of data, job codes and a code library depended by a cluster of the cloud platform during job execution is protected; therefore, a malicious cloudinternal attacker cannot obtain and tamper the code and input data of the user in the job execution process; privacy information of a user in the cloud computing process is guaranteed, various attacks mentioned above can be successfully resisted, frequent page exchange and on-demand dynamic code library loading in the task execution process are avoided by introducing verifiable secret sharing andan inadvertent transmission protocol, and minimization of a trusted area is guaranteed.

The invention discloses a low-carbon alloy steel vacuum carburizing technology. Pulse type vacuum carburizing equipment is adopted for carburizing. The low-carbon alloy steel vacuum carburizing technology comprises the following steps that firstly, low-carbon alloy steel is heated to 900+/-5 DEG C for soaking; secondly, at the soaking temperature, first-section carburizing, diffusion and second-section carburizing are conducted, and then temperature rise is conducted to 920+/-5 DEG C for second-section diffusion; first-section carburizing is conducted for 42-50 min, diffusion is conducted for115-122 min, second-section carburizing is conducted for 60-70 min, second-section diffusion is conducted for 160-200 min, and pulse type infiltration of a carburizer is adopted in first-section carburizing and second-section carburizing; and thirdly, cooling is conducted to 830+/-5 DEG C, and quenching is conducted after heat preservation. By adoption of the technology, the surface is free of oxidation after heat treatment, carbide is in the level of 1-2, accordingly, the later fracture and crack risk of products is avoided, and the service life of the products is prolonged.

The invention discloses a real-time production index supervision system for a pulverized coal gasification device, relates to the technical field of production index supervision, and solves the technical problem of high investment cost due to wide production index supervision range in the production process of the pulverized coal gasification device in the prior art. According to the method, data related to hazards are judged, related production supervision is carried out according to the data related to the hazards, device faults or accidents can be effectively avoided, meanwhile, index supervision carried out by the system in the mode is more targeted, and the accuracy of index supervision can be guaranteed; according to the method, historical accidents of the pulverized coal gasification device are analyzed, and property analysis is performed on the accidents of the pulverized coal gasification device through data analysis, so that a reference standard is provided for production index supervision, and the accuracy of production index supervision can be improved.

The invention discloses a siphon end structure for a steam heating roller, belongs to the field of machinery, and mainly relates to an end structure of a siphon of a condensed water siphon system of the steam heating roller. An inner cavity is arranged in a roller body of the steam heating roller, and the two ends of the roller body are each fixedly connected with a shaft head. One end of each shaft head extends into the roller body, and one shaft head of the roller is of a through hole structure. The siphon end structure is characterized in that the siphon is provided with an end protection structure formed by removing part of wall thickness materials at the end, and the end protection structure can prevent the siphon from being possibly subjected to fatigue impact of the roller for a long time compared with the characteristics of low strength and quick wear relative to other parts of the siphon, so that the technical problem of double difficulties that the minimum siphon gap needs tobe ensured and the siphon is possibly subjected to fatigue impact of the roller in high-speed operation for a long time to cause common breakage is solved.

The invention relates to an integrated sulphur pulverizing device, and aims at solving the problems that according to an existing sulphur pulverizing device, sulphur powder flow still escapes, consequently, the environment is polluted, and production safety is caused. A pulverizing box and a feeding groove are included. The feeding groove is formed in the upper end of the pulverizing box. The inner side wall of the feeding groove is connected with a fixed seal plate, and a rotation seal plate is hinged to the inner side wall of the feeding groove, and the lower end of the rotation seal plate is connected with a steel rope. According to the integrated sulphur pulverizing device, the whole device is integrally arranged, and only the feeding groove and a discharging port are reserved so thatgap minimization can be guaranteed; meanwhile, a seal device is arranged at the position of the feeding groove so that during pulverizing, a better seal function can be achieved. The integrated sulphur pulverizing device is reasonable in structure, during pulverizing, it can be guaranteed that the sulphur powder is constantly located in the pulverizing device and cannot be diffused into air, so that environment pollution is avoided, and the problem about production safety is solved.

The invention belongs to the technical field of electronic component processing, and particularly relates to a full-automatic sealing and welding machine for a quartz crystal resonator and a sealing and welding method. The sealing and welding machine comprises a table board assembly, a vacuum cover assembly, a laser sealing and welding assembly and an air pressure assembly which are arranged on the rack; the machine is high in automation degree, operation is safe and convenient, machining and production can be conducted in a closed environment, and a finished product has the advantages of being good in product quality and high in finished product consistency; the method is especially suitable for processing and production of quartz crystal resonators. Another purpose of the invention is toprovide a sealing and welding method, and therefore the working efficiency and the finished product quality of the full-automatic sealing and welding machine for the quartz crystal resonator can be remarkably improved.

The invention discloses a siphon pipe end part structure for a steam-head roller, belongs to the mechanical field, and primarily relates to the siphon pipe end part structure for the steam-head roller. The structure is characterized in that a siphon pipe is provided with a protecting end part. Minimization and effectiveness of a siphon gap are guaranteed through the protecting end part by enlarging the siphon gap of the siphon pipe in terms of principles of couple hardness with softness and Yin and Yang assisting each other: the siphon pipe is easy to break if too rigid and the siphon pipe isnot rigid persistently, the siphon pipe is easy to bend if too flexible and the flexibility is not persisted, and it is bound to loss and Yin is lost to benefit Yang. Impact of the roller is absorbedand avoided by means of elastic deformation, flexible deformation and quick wear of the protecting end part, so that a technical problem in a dilemma that it is to guarantee the minimum siphon gap ofthe siphon pipe and it is to guarantee that the guarantee pipe is free of fatigue break due to impact of the high speed operating roller is solved.