939 results about "Collision prevention" patented technology

Interference, collisions, power control, and spatial reuse constitute important issues that need to be resolved urgently in multihop wireless networks such as ad hoc networks, single-hop/multihop wireless LANs, sensor networks, and mesh networks. A method called the evolvable interference management (EIM) method is disclosed in this patent for avoiding/preventing interference and collision and increasing network throughput and energy efficiency in wireless networks. EIM employs sensitive CSMA/CA, patching approaches, interference engineering, differentiated multichannel, detached dialogues, and/or spread spectrum techniques to solve the interference and QoS problems. Also, EIM embodiments based on collision prevention without dialogues are capable of collision reduction/control and can resolve several important problems encountered in previous MACP or RTS/CTS-based protocols, while improving/retaining their important advantages.

The invention provides a cooperative anti-collision device based on vehicle-vehicle communication, belonging to the technical field of intelligent transportation/automobile safety control. The device comprises a vehicle operation information acquisition unit, a vehicle-vehicle communication unit, an information processing control unit, a data storage unit, an alarm unit and an execution unit. The vehicle operation information acquisition unit comprises a wheel speed sensor and a ranging module. Through the invention, the safety guarantee in vehicle running is enhanced; however, each vehicle executing cooperative collision prevention needs to be additionally provided with a cooperative anti-collision device, and a single vehicle only can implement the functions of a common anti-collision device; the vehicle-vehicle communication unit can acquire the information of space, speed and the like of the vehicles around in real time and perform real-time information interaction with the vehicles around; when the space is less than the safe space, the information processing control unit of the rear vehicle calculates the expected deceleration to avoid collision by reducing speed; and if the collision can not be prevented only by the rear vehicle, acceleration allocation information is sent to the front vehicle to notify the front vehicle to accelerate for cooperative collision prevention.

A collision prevention relational function is disclosed for RFID tags, which increases stability during system operations. The RFID tag includes a parallel resonance circuit having a coil, a resonance capacitor, an adjustment capacitor, a switching circuit, a rectification circuit, a smoothing capacitor, a constant-voltage circuit, a voltage detection circuit, an exclusive OR circuit, a timer circuit, a voltage detection circuit, a control circuit, an OR circuit, a latch circuit, an UID storage device, and a data modulator/demodulator. When a predetermined power supply voltage/operating voltage is obtained, an anti-collision algorithm identifies and adjusts RFID tags that experienced collision.

The invention provides a method for inland river bridge zone shipborne sailing active collision prevention. The method comprises the steps of collecting hydrological information, meteorological information and ship information of nearby ships and the ship, automatically updating river map information on line, and performing data storage; forecasting tracks of the ship and other ships according to obtained track information of the ship and other ships by combination with the real-time hydrological information and the meteorological information, and obtaining track information of every ship; calculating the nearest meeting distance and the nearest meeting time of the ship and a target object according to the obtained track information; and giving collision accident pre-warning and active collision prevention suggestions according to the nearest meeting distance and the nearest meeting time of the ship and the target object. According to the method, by predicating ship sailing situations, the shortcoming that an existing ship assistance navigation device cannot accurately obtain the position of the target object, and the nearest meeting distance and the reaching of the nearest meeting distance cannot be pre-judged more accurately is overcome.

The present invention relates to a collision prevention device and method for a vehicle in motion on the ground.

The collision prevention device 1 notably comprises:

• • means for localizing obstacles 100, 101, 102, 103, 5, 6, 7;
  • means for acquiring obstacle localization data 2, 4;
  • means for localizing 10 the equipped vehicle;
  • a collision prevention computer 3:
    • combining the obstacle localization data coming from the acquisition means 2, 4;
    • taking into account a description of a configuration of the equipped vehicle and also the localization of the equipped vehicle;
    • detecting proximity conflicts between the equipped vehicle and the localized obstacles;
    • generating alerts in the case of proximity of the equipped vehicle and a localized obstacle;
    • generating at least one solution for resolving each conflict detected;
  • presentation means 12, presenting warnings to a driver of the equipped vehicle.

This device can notably be installed on board an aircraft in order to warn of potential collisions between the aircraft and an object or another vehicle when the aircraft is on the ground.

The invention provides an AUV intelligent collision prevention device and a collision prevention method. The state information of the AUV collected by the sensor is passed to a dynamic control machine by a serial port. The dynamic control machine transmits the state information to a mission management machine by a network; a multi-beam front looking-sonar collects barrier information which is converted to a digital signal describing local environment; the mission management machine receives the digital signal of the local environment; an AUV barrier decision-making system determines the position of the barrier, establishes a local environment model which is passed on to a collision prevention planning system; the collision prevention system figures out course, speed, and depth of the AUV by collision prevention algorithm and passes on the three instructions to the dynamic controller by the network; the dynamic control machine controls resolving by movement, uses a control voltage to drive an executing agency, and adjusts course, speed and depth of the AUV according to the steering instructions, thus realizing AUV collision prevention. The invention has the advantages that collision prevention is realized in real time without needing prior knowledge and reliability and validity of the proposal of the invention are proved by a lake testing.

The invention relates to a mobile robot path planning method used in an intensive storage zone. The mobile robot path planning method is technically characterized by comprising the following steps: step 1, an initialized net type path diagram is set up by a scheduling layer server; step 2, a cargo storage task is divided into an empty trunk cargo searching subtask and a loading delivering subtask by the scheduling layer server; step 3, a dynamic planning path of the mobile robot is established by the scheduling layer server and a dynamic planning path of the mobile robot is sent to the mobile server; step 4: the mobile robot executes the corresponding subtask; step 5: the mobile robot sends a state report of the mobile robot to the scheduling layer server; and step 6, the scheduling layer server updates the current position, the load state, and a weight related to an original starting point and a target point of the mobile robot. By dividing every task into the empty trunk cargo searching subtask and the loading delivering subtask, according to the planning paths of different subtasks, the complexity of a safety collision prevention operation of a plurality of mobile robots is reduced, and the instantaneity and the effectiveness of the system are improved.

The invention discloses a no-signal intersection vehicle and vehicle cooperative collision prevention system, which comprises a wireless communication module, a central processing unit, a vehicle running state information collecting module, a driving intention judging module, a man-machine interaction interface, a brake control module and a power supply management module. According to the system, information such as self vehicle position, speed, acceleration and the like are collected by the vehicle running state collecting module, and the self vehicle running state is obtained; the vehicle turning information is collected through the driving intention judging module, and the driving intention of a driver is judged; the self vehicle information is sent out to the periphery by the wireless communication module in a broadcasting way, and the running state information of surrounding vehicles is received; the central processing unit is connected with the vehicle running state information collecting module, the driving intention judging module and the wireless communication module, information of the self vehicle and other vehicles is obtained, the collision judgment and the disposition are carried out, the collision occurrence is judged, the vehicles are controlled to be braked through the brake control module, and early warning signals are given to the driver through the man-machine interaction interface; the man-machine interaction interface can also control the starting and the stop of the system; and the power supply management module provides power supply for each module of the system.

The present invention relates to a collision prevention method for a RFID system and a RFID system to minimize the collision of response signals by using sector antennas and controlling the power. The present invention comprises the steps of: separating plural tags in a space by setting up plural number of sector antennas; setting up the output stages of the power of each sector antenna to be increased in plural sequential stages; and reading a tag belonging to the output range by selecting a first sector antenna and transmitting minimum power among the set up stages. The present invention considerably reduce the collision probability of response signals of tags by dividing the tags in a space when a reader reads or writes tag information. The present invention also minimizes the time consumed to read/write tags and improves the communication distance and capacity.

The invention discloses a security anti-collision early-warning method based on vehicle driving speed and position information fusion. A vehicle-mounted device obtains information of longitudes and latitudes, speeds and heading angles of the vehicle and another vehicle in real time; according to a rectangular plane coordinate system of longitude and latitude conversion, vehicle coordinate information can be obtained; and on the basis of vehicle ordinates and heading angles, determination of vehicle straight line collision and side collision can be carried out, so that algorithm processing is carried out respectively. According to a driving speed of a vehicle, different vehicle security collision prevention time is determined; if the vehicle collision occurrence time is less than or equal to security collision prevention time, a risk of vehicle collision exist and the driver can be warned timely; and if the vehicle collision occurrence time is larger than the security collision prevention time, updated vehicle state information is processed again. According to the invention, the method is not limited by vehicle-mounted equipment; the early warning precision is improved effectively; unnecessary early warning is reduced; and the method is suitable for early warning of driven vehicle collision prevention.

The invention relates to a method for solving multiple mobile robot path conflict based on a buffer area. The method is characterized by comprising the following steps of scheduling a main thread and a parallelly executed planning thread in a server, a collision prevention thread and an execution thread, wherein the main thread initializes and updates a net-shaped path diagram in real time; when the planning thread detects a cargo access task, acquiring starting pint and target point information, dividing the task into a plurality of sub-tasks, and planning a task path; seizing resource variables, allocating tasks, defining occupiable paths of a mobile robot, and adding the tasks into an executing queue by a path scheduling thread; and executing a thread executing command and sending order to the mobile robot. The method is reasonably designed; by the method, the problem that when the multiple mobile robot path conflict exists in the prior art, the whole conflict area is occupied, and one part must wait for the other part to totally go through the conflict area and then enters the conflict area to cause low efficiency is solved; and the conveying efficiency of the mobile robot is improved.

The invention provides a multi-robot path planning and coordination collision prevention method based on fuzzy logic. The method comprises the steps of confirming an input variable and an output variable of a fuzzy controller by setting up the fuzzy controller with robots as a system, using related languages to describe the input variable and the output variable of the fuzzy controller, confirming a qualitative reasoning principle according to the fuzzy control theory, setting up fuzzy control rules according to input signals and output signals of the fuzzy controller, selecting a subordinating degree function of each input language variable and a subordinating degree function of each output language variable, finally, conducting defuzzification, conducting voting on the basis of the maximum principle of the subordinating degree functions, conducting corresponding motions on the robots, and completing the task for planning a path of a single robot. On the basis of the method, the other robots are regarded as dynamic front barriers, and the aim of coordination collision prevention of the multiple robots can be achieved.

The invention relates to a robot autonomous obstacle avoidance moving control method based on distance vectors. In the moving process of a moving robot in the environment, the distance vectors from the robot to obstacles are measured through a distance measuring sensor and an angle sensor which are carried on the robot, the current position of the robot serves as the original point all the time to set up coordinate systems for unknown environments with multiple nearby obstacles, the distance vectors from the robot to the edges of the obstacles are measured, the steering angles of the collision prevention obstacles are obtained, the distance vector, larger than the radial size of the robot, between the two adjacent obstacles is obtained, the distance vector, at which collision with the two adjacent obstacles can be avoided at the same time, composed of the central points of the distance vectors between the current position to the robot and the two adjacent obstacles is obtained and serves as the moving direction of the robot and the moving path through which the robot can pass through the two obstacles, safety obstacle avoidance can be achieved to the maximum, and the autonomous obstacle avoidance moving from the starting point to the target point is achieved. According to a control model, the practical radial sizes of the moving robot and the environment obstacles are taken into consideration, and the robot autonomous obstacle avoidance moving control method has the practical application significance.

The present invention provides a collision prevention automatic warning system, constructed to comprise a control circuit embracing a controller, a plurality of sensors, a light-emitter, a sound-emitter, an electric battery power supply, and a standby battery supply, therewith the system is installed in a vehicle. When a vehicle collision occurs, the sensor detects a signal and transmits same to the controller, whereupon the controller notifies the light-emitter and the sound-emitter, which thereupon emit a bright light and a loud sound respectively, and can also activate an automatic police reporting system, thereby promptly warning vehicles coming up from rear to pay heed to the collision and thus preclude further collisions from occurring, and having functionality to transmit a report to the police which can accelerate rescue time.

The invention discloses a real-time location method and a system based on radio frequency identification of a mobile communication terminal. A transmitting function of a radio frequency identification locating signal extends in the mobile communication terminal, a reading function of the radio frequency identification locating signal is realized in an identification locating reader, the mobile communication terminal is communicated with the identification locating reader through wired and wireless communication networks and a network server, by adopting subcarrier modulation, direct sequence spread spectrum, code division multiple access, time division collision prevention and multi-system parameter calibration technologies, the interference between a multipath signal and multiple terminals of multiple readers, and the interference of the other wireless communication system can be effectively inhibited, the remote high-precision radio frequency identification location is realized, and the network server is utilized to carry out distributed interactive processing fusion of data information and network dynamic optimization configuration of communication parameters, so that the convenient, reliable, economic and flexible real-time location service application based on the mobile communication terminal can be provided for a user.

In a multi-table lithographic apparatus in which substrate tables may be exchanged between a first working zone where substrates are loaded onto and removed from the table and a second working zones where wafers are exposed, collision prevention means are provided to prevent collisions between tables in the exchange process. The collision prevention means may be formed of a labyrinth or a revolving door. The exchange process may be controlled by shuttles, optionally including drive means, that are interlinked so that the tables can only be exchanged between zones together.

The invention discloses an anti-collision control method for safety of in-obit operation of formation-flying satellites, in which influences of satellite contour dimension, various agitation errors, time forecasting error and position measurement error are seriously concerned, collision probability based description modes and determination methods for collision probability of the formation-flying satellites are systematically provided, and aiming at different operation situations of the formation-flying satellites, description indexes of integral and partial satellite collision possibility are respectively provided, so that the method is suitable for prevention of integral collision possibility of a plurality of formation-flying satellites. The method comprises the following steps: firstly, calculating collision probability density between two satellites, secondly, calculating the collision probability between the two satellites, and finally, calculating the collision probability of the formation-flying satellites. The method can be used for collision prevention for safety of in-obit operation of the formation-flying satellites, and can ensure real time and rapidity of determination of collision prevention for safety of the formation-flying satellites.

A collision prevention warning method and device capable of tracking a moving object, the method comprises the following steps. Firstly, capturing a plurality of continuous images in a front region of 180 degrees, through identifying category of at least an obstacle in these continuous images, to find a moving obstacle. Next, detect continuous relative positions of the moving obstacle and vehicle, to estimate a first collision region of the vehicle. Then, based on the continuous relative positions and an Extended Kalman Filter Algorithm, to estimate a second collision region of the moving obstacle. Finally, based on the first collision region and the second collision region to calculate a collision point. When the first collision region and the second collision region at least partially overlap each other, estimate out a collision time, and then output an alarm signal to warn the driver and raise driving safety.

The invention discloses an unmanned aerial vehicle autonomous formation evaluation index and model prediction control (MPC) formation control method and belongs to the technical field of flight control. According to the method, a definition relevant to unmanned aerial vehicle autonomous formation, a computing method of the collision prevention probability of unmanned aerial vehicle autonomous formation and an unmanned aerial vehicle autonomous formation evaluation index are provided, and the MPC formation control method applicable to unmanned aerial vehicles is provided. The method solves the problem how to give out the collision prevention quantitative index which should be followed by design of an autonomous formation flight control system when it is known that the unmanned aerial vehicle autonomous formation scale is M, the average expectation distance between unmanned aerial vehicles in formation is dr, and the collision probability of the whole formation is required to be smaller than Pc. The method provides a quantitative index basis for engineering design of the unmanned aerial vehicle autonomous formation control system, and the collision problem the unmanned aerial vehicles in dense formation is solved.

A method and apparatus for detecting a vehicle. An apparatus comprises a proximity detection system, a vehicle management system, and a notification system. The proximity detection system is associated with an aircraft and operably connected to a transducer. The proximity detection system is configured to determine a distance of a vehicle from a surface of the aircraft and a velocity of the vehicle relative to the aircraft. The vehicle management system operably connected to the proximity detection system. The vehicle management system is configured to determine a time the vehicle will be a threshold distance from the surface of the aircraft and an threshold amount of time to bring the vehicle to a predetermined velocity. The notification system is associated with the proximity detection system and configured to generate a notification signal in response to a determination that the time is less than the threshold amount of time.

The invention discloses a method and a device for an unmanned plane during the flying. The method comprises that: the unmanned plane is provided with a vehicle-mounted response recognition system which is connected with a navigation flying control system of the unmanned plane and transmits a local plane number and flying parameters in real time to notify the ground and other planes the position and flying parameters of the local plane and simultaneously receive the plane numbers and the parameters of other planes and judge the safe distance between the local plane and the other planes; and when the distance between the local plane and the other planes is smaller than the safe distance, the vehicle-mounted response recognition system automatically avoids other planes through the navigation flying control system of the unmanned plane. The device comprises the vehicle-mounted response recognition system (1) which is connected with the navigation flying control system (4) of the unmanned plane. Compared with the prior art, the method and the device can prevent the unmanned plane from colliding with other planes, enlarge the application range of the unmanned plane, and provide favorable condition for the unmanned plane to enter a common airspace to fly.

The invention discloses an AIS information-based multi-target anti-collision warning method, which comprises the following steps: (1) building a predicted area of danger (PAD) model adapting to a multi-target condition; (2) setting DCPAs and TCPAs of a chip; (3) calculating collision prevention factors according to AIS information; (4) carrying out anti-collision warning judgment; and (5) displaying a predicted course of danger (PCD) on a circle of collusion prevention situation (CCPS) of the ship in a superposing manner. Collision prevention correlation factor calculation is carried out by the AIS information; dynamic information can be effectively obtained to calculate correlation factors even if being in a sea area with relatively high navigational density; and collision prevention ship handling intentions of all ships can be timely reflected. The built CCPS model effectively meets the requirements of clearly and simply displaying the collision prevention situation under the multi-target condition; meanwhile, collision warning information can be provided; and a collision prevention decision under the condition of keeping the speed can also be provided, so that convenience is provided for a watch keeper for carrying out ship commanding and dispatching.

The present invention relates to a moving-magnet straight-line compressor. It includes a linear motor component, it mainly has inner and outer magnetic yokes with concentric combined structure, moving-magnet coil, permanent magnet and motor runner bracket, the permanent magnet is positioned on the motor rotor bracket and placed in the magnetic field formed from inner and outer magnetic yokes; a compressor component, it mainly has machine seat, cylinder, exhaust valve and suction valve which are positioned on the machine seat and piston connected with motor runner; and a machine shell which is seal-connected with machine seat. It is characterized by that it also includes a suspension component, it mainly has a spring support frame, flexible springs, inner and outer washers and collision-prevention mechanism, etc.