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760 results about "Minimum time" patented technology

Robot path planning method and apparatus thereof based on Bezier curve

The invention provides a robot path planning method and an apparatus thereof based on a Bezier curve. The method comprises the following steps that: a robot path planning parameter input unit receives and sets a robot state parameter, a constraint condition, a path discretization minimum time resolution; a robot path generation unit generates a group of Bezier curve control points consisting of four 4-dimension vectors according to the robot state parameter and plans out a continuous path between an origin position to a target position of the robot; the robot path generation unit forms a timepoint sequence according to the path discretization minimum time resolution and calculates a discretization path according to the continuous path; a path point parameter detection unit detects whether a speed, an acceleration and a turn radius of each path point which is corresponding to the time points satisfy the constraint condition; if the speed, the acceleration and the turn radius of each path point do not satisfy the constraint condition, the control points are regenerated; otherwise, a planning path output unit receives and outputs a robot path which is planed by the path point parameter detection unit and satisfies the constraint condition.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI

Latency control circuit and method thereof and an auto-precharge control circuit and method thereof

InactiveUS7609584B2Decreasing routing complexity and circuit area and delayReduced footprintDigital storageMinimum timeMemory bank
A latency control circuit and method thereof and auto-precharge control circuit and method thereof are provided. The example latency control circuit may include a master unit activating at least one master signal based on a reference signal and an internal clock signal and a plurality of slave units receiving the at least one master signal, each of the plurality of slave units receiving a plurality of signals and outputting an output signal based at least in part upon one of the received plurality of signals. The example method of latency control may include receiving at least one master signal, the received at least one master signal activated based on a reference signal and an internal clock signal and receiving a plurality of signals and outputting an output signal based at least in part upon one of the received plurality of signals and latency information. The example auto-precharge control circuit may include a precharge command delay unit generating a plurality of first precharge command delay signals in response to an internal clock signal and a write auto-precharge command signal, at least one bank address delay unit outputting a delayed bank address signal and a precharge main signal generator outputting a precharge main signal to banks based on the delayed bank address signal. The method of performing a precharging operation with the auto-precharge control circuit may include delaying a bank address signal based on a minimum time interval between executed memory commands and outputting a precharge main signal to one or more memory banks based on the delayed bank address signal.
Owner:SAMSUNG ELECTRONICS CO LTD

Method for distributing and routing optimal services of multi-layer satellite network based on minimum time delay

The invention discloses a method for distributing and routing optimal services of multi-layer satellite network based on minimum time delay, and aims to solve the problems of large end-to-end time delay, low handling capacity and insufficient utilization of network resource of a multi-layer satellite communication network routing method. The method comprises the following steps: determining a logic area, a virtual node number and a low-earth-orbit satellite routing list according to the initial network topology; periodically updating the node number and the routing list by a low earth orbit; updating a virtual satellite set and a member routing list according to the snapshot time sequence set by a medium earth orbit, and synchronously updating the number of an administrator by the low earth orbit; if the services arrive and the arrival rate of the current satellite area is less than the arrival rate threshold of the ground service supported by the area based on the minimum end-to-end time, transmitting the service in the low earth orbit, and otherwise, transferring the service to a high-level satellite to route, and finally sending a target node. With the adoption of the method, the performance of the multi-layer satellite communication network is improved; the method can be applied to the routing of the multi-layer satellite communication network.
Owner:XIDIAN UNIV

Navigation method and navigation device of agricultural machinery as well as agricultural machinery

The invention provides a navigation method and a navigation device of agricultural machinery as well as agricultural machinery, wherein the navigation method of agricultural machinery comprises the following steps: acquiring positioning information comprising position coordinates, speed and course information of the agricultural machinery through more than one sensor; according to the two-wheel kinematics model of the agricultural machinery and the minimum time problem in the optimal control theory, acquiring the expected path information of the agricultural machinery by computing; designing a optimal controller of a path tracking according to the two-wheel kinematics model of the agricultural machinery and the design criteria on a terminal time unlimited regulator of a tracking problem; acquiring a path error according to the positioning information of the agricultural machinery and the expected path information; and acquiring path adjusting information according to the path error information and the path tracking optimal controller, and sending the path adjusting information to an automatic steering system. The embodiment of the invention also provides a navigation device of the agricultural machinery and the agricultural machinery provided with the navigation device. The method, the device and the equipment can improve the accuracy of navigation.
Owner:CHINA AGRI UNIV

Method and device for obtaining optimal path to hurry to scene of traffic accident

The invention discloses a method and device for obtaining an optimal path to hurry to a scene of a traffic accident. The method comprises the following steps of: respectively calculating fastest paths for police cars around an accident scene to arrive at the accident scene and selecting one path which consumes the shortest time from all the fastest paths as the optimal path; and announcing the police car corresponding to the optimal path to hurry to the accident scene by adopting the optimal path, thus arriving at the accident scene in the shortest time. Therefore, by utilizing the method, the accident spread is avoided, the injuries and deaths can be reduced; and the time for processing the traffic accident is effectively saved by the method. In the method, when the fastest driving paths of the police cars are calculated, each driving path is segmented at first and then the driving time of the whole driving path is calculated through calculating an average car speed of each segment of the path, so that the fastest driving path is found out. As the path is segmented, the calculated average speed is more precise and more accurate. The invention also discloses a device corresponding to the method; and the method and the device are combined so that the police car can arrive at the accident scene in the shortest time.
Owner:GUANGDONG VTRON TECH CO LTD
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