WO2022083292A1 - 一种智能移动机器人全局路径规划方法和系统 - Google Patents
一种智能移动机器人全局路径规划方法和系统 Download PDFInfo
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- WO2022083292A1 WO2022083292A1 PCT/CN2021/115501 CN2021115501W WO2022083292A1 WO 2022083292 A1 WO2022083292 A1 WO 2022083292A1 CN 2021115501 W CN2021115501 W CN 2021115501W WO 2022083292 A1 WO2022083292 A1 WO 2022083292A1
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- 230000006870 function Effects 0.000 description 5
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- 230000009286 beneficial effect Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/20—Instruments for performing navigational calculations
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots
- G05D1/02—Control of position or course in two dimensions
- G05D1/021—Control of position or course in two dimensions specially adapted to land vehicles
- G05D1/0212—Control of position or course in two dimensions specially adapted to land vehicles with means for defining a desired trajectory
- G05D1/0214—Control of position or course in two dimensions specially adapted to land vehicles with means for defining a desired trajectory in accordance with safety or protection criteria, e.g. avoiding hazardous areas
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots
- G05D1/02—Control of position or course in two dimensions
- G05D1/021—Control of position or course in two dimensions specially adapted to land vehicles
- G05D1/0212—Control of position or course in two dimensions specially adapted to land vehicles with means for defining a desired trajectory
- G05D1/0219—Control of position or course in two dimensions specially adapted to land vehicles with means for defining a desired trajectory ensuring the processing of the whole working surface
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- the invention relates to the field of intelligent control of mobile robots, in particular to a global path planning method and system for an intelligent mobile robot.
- mobile robots have served all walks of life in social development, and can replace manual tasks with high execution efficiency and low error rate, which can effectively reduce labor costs and operating costs, such as factories, hospitals, families, hotels, exhibition halls, restaurants. It mainly performs tasks such as logistics, handling and distribution.
- Mobile robots need to navigate autonomously within work scenarios, be able to locate accurately and travel safely.
- the movement of the mobile robot needs to abide by the traffic rules similar to motor vehicles, such as no-going area, right-handing area, boycotting area, no-going line and one-way line.
- a mobile robot When a mobile robot operates in a work scene, it generally builds a global map of the surrounding work scene in advance, and realizes safe travel from the starting point to the target point according to the requirements of the job task.
- the global path planning algorithm of an ordinary mobile robot will only search for the nearest or the shortest time-consuming shortcut, and will not follow the traffic rules of the drivable passage, which will lead to more dynamic objects and narrow drivable areas.
- the smoothness of travel in other scenes is very poor.
- the invention provides a global path planning method and system for an intelligent mobile robot, which enables the mobile robot to realize autonomous navigation when operating in complex dynamic scenes, has good safety and order and high real-time performance, and solves the problem of many applications in different complex dynamic scenes. Traffic congestion in narrow work areas for mobile robots.
- the present invention provides a global path planning method for an intelligent mobile robot, including:
- S1 determine the global information of the job, and obtain a global grid map after gridizing the global scene of the job;
- S3 discretize the grid value of the global grid map, and define that the distance between the area passed by the mobile robot and the obstacle is greater than the radius of the circumcircle of the mobile robot;
- the special area includes at least one of a no-going area, a right-handing area, a boycotting area, a no-going line and a one-way line.
- the S2 includes:
- the no-going area, the right-handing area, the resisting area, and the no-going line are obtained in the first predetermined area, and by restricting the grid diffusion of the global grid map in the second predetermined area Set a single line.
- the grid value of the global grid map ranges from 0 to 255 or 0 to 1023.
- the surrounding environment information is sensed in real time through laser sensors and Doppler radar, and the mobile robot is globally positioned in the grid map.
- an embodiment of the present invention also discloses a global path planning system for an intelligent mobile robot, including:
- the grid map conversion module is used to output a grid map after gridding according to the input global scene of the job;
- a driving rule and special area setting module connected with the grid map conversion module, for setting driving rules and special areas on the grid map;
- the map discretization module is connected to the grid map conversion module, the driving rules and the special area setting module, and is used to discretize the grid values of the global grid map to define the area and obstacles that the mobile robot passes through The spacing is greater than the radius of the circumcircle of the mobile robot;
- the A* algorithm path planning module is connected to the map discretization module, receives the starting point and the target point of the mobile robot, uses the A* algorithm to define the pass value for the global grid map, and outputs to the mobile robot A series of consecutive coordinate values of waypoints in the grid map from the starting point to the target point.
- a grid value setting module connected with the map discretization module, for receiving a grid value adjustment instruction, and adjusting the grid value of the global grid map.
- a travel speed limit module connected with the A* algorithm path planning module, for setting the travel speed of the mobile robot according to the passing value of the current grid passed by the mobile robot.
- the method and system for global path planning of an intelligent mobile robot provided by the embodiments of the present invention have the following beneficial effects:
- the method and system for global path planning of an intelligent mobile robot are based on a pre-built global grid map of the scene, set based on traffic rules similar to motor vehicles, and define a pass value on the global grid map to improve the A* global path search algorithm, and generate an output
- the continuous path point coordinate value realizes navigation, which enables the mobile robot to realize autonomous navigation in complex dynamic scenes, with good safety and order and high real-time performance. Traffic congestion problem.
- FIG. 1 is a schematic flowchart of steps of an embodiment of a global path planning method for an intelligent mobile robot provided by the present application
- FIG. 2 is a schematic flowchart of steps of another embodiment of a global path planning method for an intelligent mobile robot provided by the present application;
- FIG. 3 is a schematic structural diagram of an embodiment of an intelligent mobile robot global path planning system provided by the present application.
- FIG. 4 is a schematic structural diagram of another embodiment of the global path planning system for an intelligent mobile robot provided by the present application.
- Figure 1 is a schematic flowchart of steps of an embodiment of a global path planning method for an intelligent mobile robot provided by the application
- Figure 2 is another embodiment of the global path planning method for an intelligent mobile robot provided by the application
- Fig. 3 is a schematic structural diagram of an embodiment of an intelligent mobile robot global path planning system provided by the application
- Fig. 4 is a structural schematic diagram of another embodiment of an intelligent mobile robot global path planning system provided by the application.
- the present invention provides a global path planning method for an intelligent mobile robot, including:
- S1 determine the job global information, gridize the job global scene to obtain a global grid map; that is, determine the entire environment in which the mobile robot works, set its allowable activity range as the job global, and then perform gridding. Obtain a global grid map after rasterization;
- S2 setting driving rules and setting special areas on the global grid map; the purpose of setting formal rules and special areas is to enable the mobile robot to follow certain rules during the traveling process, which may be the use of current traffic rules, or Other self-defined traffic rules may be adopted, which is not limited in the present invention.
- the conventional global grid map method discretizes the real environment and divides it into a square grid with a certain resolution, such as a width of 20cm, where 1 means there is an obstacle, 0 means no obstacle, and -1 means unknown.
- a certain resolution such as a width of 20cm
- 1 means there is an obstacle
- 0 means no obstacle
- -1 means unknown.
- such a single representation often does not take the safety size information of the mobile robot into account, and will plan a path very close to the obstacle, while taking into account the constraints of certain traffic rules set, which is easy to happen in actual operation.
- a logic error occurs when the mobile robot collides with the obstacle area.
- the A* algorithm is a heuristic algorithm, which is composed of a cost function and a heuristic function.
- the cost function represents the cost from the starting grid to the target grid, which is usually calculated from the cost value of walking through the grid.
- the heuristic function represents the estimated cost from the starting point to the target point, usually calculated by the current grid. The Manhattan distance from the grid to the target grid is calculated.
- the setting is based on the traffic rules similar to the motor vehicle, and the global grid map is defined to define the passing value to improve the A* global path search algorithm, and generate and output continuous coordinate values of the waypoints to realize autonomous navigation, so that the mobile The robot realizes autonomous navigation when operating in complex dynamic scenes, with good safety and order and high real-time performance, and solves the problem of traffic congestion in the narrow operating area of multi-mobile robots in different complex dynamic scenes.
- the present invention does not limit the setting method, type and quantity of the special area. It may be a special area that only includes the actual terrain, or a special area formed due to communication signals such as electromagnetic interference or other reasons.
- the special area includes prohibited areas. At least one of the line area, the right line area, the boycott area, the forbidden line and the one-way line.
- the S2 includes:
- the no-going area, the right-handing area, the resisting area, and the no-going line are obtained in the first predetermined area, and by restricting the grid diffusion of the global grid map in the second predetermined area Set a single line.
- the present invention is not limited to the above-mentioned special area setting method, and can also be set by using a model, that is, classifying the special area, using the keyboard or mouse to select the area and then selecting the type to realize the setting of the special area. , and can also be assigned to a specific area, so that in the identification process, the specific assignment area can be defined as the required type.
- the present invention does not limit the range of grid values of the global grid map, which can be set according to the actual path planning accuracy and data processing capability.
- the grid values of the global grid map range from 0 to 255 or 0 to 1023.
- the position of the mobile robot changes continuously during the traveling process, so it is necessary to continuously position the mobile robot to realize that the mobile robot travels according to the predetermined path.
- the S5 after the S5, it also includes:
- the surrounding environment information is sensed in real time by a laser sensor and a Doppler radar, and the mobile robot is globally positioned in the grid map.
- the present invention does not limit the way of sensing the surrounding environment information, and is not limited to the above-mentioned ways, and other ways can also be used, such as using a trigger to trigger after the mobile robot reaches a designated position, so as to realize position perception, and even further It can be combined with satellite positioning system to realize positioning and so on.
- the present invention does not limit the method of adjusting the grid value of the global grid map, which can be directly inputted by keyboard, or implemented by mode selection, or other methods, such as increasing or decreasing one step.
- the following steps are further included:
- the present invention does not limit the way of controlling the traveling speed of the mobile robot, and the access can be corresponding to the passing value in real time, and the speed can also be limited similarly to each road section of a train.
- the traversal modification of the grid cost value of the conventional grid map, the global path planning of the mobile robot is based on a constructed global grid map, combined with the real-time perception of the surrounding environment information by the laser, to find a path from the starting point to the A safe, collision-free, continuous path point to a target point, which is usually the shortest or least time-executed path.
- the present invention expands the range of each grid value in the conventional global grid map from 0, 1, -1 to 0 to 255, where 0 represents complete freedom, 254 represents complete occupation, and 255 represents unknown.
- 0 represents complete freedom
- 254 represents complete occupation
- 255 represents unknown.
- a new value of 1 to 253 has been added, and the closer to the obstacle, the higher the value.
- 253 is defined as the grid value of the distance from the obstacle within the radius of the inscribed circle of the mobile robot.
- the mobile robot can pass the grid with the value of 1 to 252, but cannot pass the grid with the value of 253 or 254, whether it can pass the grid with the value of 255 to see the configuration parameters.
- the size of the grid value outside the radius of the circumcircle of the obstacle can be calculated by the following formula:
- d is the distance to the nearest obstacle
- r is the radius of the circumcircle of the mobile robot
- w is the adjustment coefficient
- forbidden area, forbidden line and boycott area set the cost value to 253 or 254 in the specified area of the grid map, among which the forbidden area is set to 253, the forbidden line is set to 254, and the value of the boycott area can be specified as 1 to 252.
- the right-handed area setting the right-handed area is used in some specific situations, especially when dealing with multiple robots seems important.
- the A* algorithm will expand from the grid with the smallest current objective function value in each iteration (4-connected or 8-connected), and the grid with cost value of 253 or 254 will not be expanded until Expand to the target point, then start from the target point, and go back to the starting point in the direction with the fastest potential energy reduction. At this point, the one-time path planning is completed.
- Each point of the grid map is set with a cost value, the present invention defines a new pass value P, which has 5 values in the 4-connected system, namely NONE, LEFT, RIGHT, UP and DOWN, respectively representing no Restrict, restrict expansion left, restrict expansion right, restrict expansion up and restrict expansion down.
- a series of continuous path point coordinate values from the starting point S to the target point E in the raster map are output.
- E with coordinates [x y] and angle ⁇ values.
- the mobile robot realizes autonomous navigation from the starting point S to the target point E by passing through these intermediate path points continuously and accurately.
- the mobile robot can automatically stop or avoid obstacles autonomously, which will involve the local path planning algorithm of the mobile robot.
- an embodiment of the present invention also discloses a global path planning system for an intelligent mobile robot, including:
- the grid map conversion module 10 is used for outputting the grid map after gridizing according to the input global scene of the job;
- the driving rule and special area setting module 20 is connected to the grid map conversion module 10, and is used for setting driving rules and special areas on the grid map;
- the map discretization module 30 is connected to the grid map conversion module 10, the driving rules and the special area setting module 20, and is used to discretize the grid values of the global grid map to define the area that the mobile robot passes through The distance from the obstacle is greater than the radius of the circumcircle of the mobile robot;
- the A* algorithm path planning module 40 is connected to the map discretization module 30, receives the starting point and the target point of the mobile robot, uses the A* algorithm to define the pass value for the global grid map, and moves to the The robot outputs a series of consecutive path point coordinate values from the starting point to the target point in the grid map.
- the intelligent mobile robot global path planning system further includes a grid value setting module 50 connected to the map discretization module 30 , which is used to receive a grid value adjustment instruction and adjust the grid value of the global grid map.
- the present invention does not limit the method of adjusting the grid value of the global grid map, which can be directly inputted by keyboard, or implemented by mode selection, or other methods, such as increasing or decreasing one step.
- the global path planning method and system for an intelligent mobile robot further includes a travel speed limit module 30 connected to the A* algorithm path planning module 40, It is used to set the traveling speed of the mobile robot according to the passing value of the current grid that the mobile robot passes through.
- the method and system for global path planning of an intelligent mobile robot define a traffic value for the global grid map based on a pre-built scene global grid map, based on traffic rules similar to those of motor vehicles.
- To improve the A* global path search algorithm generate and output continuous path point coordinate values to achieve autonomous navigation, so that mobile robots can achieve autonomous navigation in complex dynamic scenes, with good safety and order and high real-time performance. Traffic congestion in narrow operating areas of multi-mobile robots in complex dynamic scenes.
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Claims (10)
- 一种智能移动机器人全局路径规划方法,其特征在于,包括:S1,确定作业全局信息,对所述作业全局的场景进行格栅化后获得全局栅格地图;S2,对所述全局栅格地图设置行驶规则以及设置特殊区域;S3,将所述全局栅格地图的栅格值离散化,定义移动机器人通过的区域与障碍物的间距大于所述移动机器人的外接圆半径;S4,采用A*算法对所述全局栅格地图定义通行值;S5,根据所述通行值以及所述移动机器人的起始点和目标点,输出所述栅格地图中一系列连续的路径点坐标值。
- 如权利要求1所述智能移动机器人全局路径规划方法,其特征在于,所述特殊区域包括禁行区、右行区、抵制区、禁行线和单行线中至少一种。
- 如权利要求2所述智能移动机器人全局路径规划方法,其特征在于,所述S2,包括:通过设置所述全局栅格地图的栅格值在第一预定区域获得禁行区、右行区、抵制区、禁行线,通过限制所述全局栅格地图的栅格扩散在第二预定区域设置单行线。
- 如权利要求3所述智能移动机器人全局路径规划方法,其特征在于,所述全局栅格地图的栅格值的范围为0~255或0~1023。
- 如权利要求4所述智能移动机器人全局路径规划方法,其特征在于,在所述S5之后,还包括:通过激光传感器、多普勒雷达实时感知周围环境信息,对所述移动机器人在所述栅格地图中进行全局定位。
- 如权利要求5所述智能移动机器人全局路径规划方法,其特征在于,在所述S5之后,还包括:接收栅格值调整指令,调整所述全局栅格地图的栅格值。
- 如权利要求6所述智能移动机器人全局路径规划方法,其特征在于,在所述S5之后,还包括:S6,检测所述移动机器人当前所处栅格的通行值,设置所述移动机器人的行进速度。
- 一种智能移动机器人全局路径规划系统,其特征在于,包括:栅格地图转换模块,用于根据输入的作业全局的场景进行格栅化后,输出格栅化地图;行驶规则与特殊区域设置模块,与所述栅格地图转换模块连接,用于对所述格栅化地图设置行驶规则以及设置特殊区域;地图离散化模块,与所述栅格地图转换模块、所述行驶规则与特殊区域设置模块连接,用于将所述全局栅格地图的栅格值离散化,定义移动机器人通过的区域与障碍物的间距大于所述移动机器人的外接圆半径;A*算法路径规划模块,与所述地图离散化模块连接,接收所述移动机器人的起始点和目标点,采用A*算法对所述全局栅格地图定义通行值后,向所述移动机器人输出所述栅格地图中从所述起始点到所述目标点一系列连续的路径点坐标值。
- 如权利要求8所述智能移动机器人全局路径规划系统,其特征在于,还包括与所述地图离散化模块连接的栅格值设置模块,用于接收栅格值调整指令,调整所述全局栅格地图的栅格值。
- 如权利要求9所述智能移动机器人全局路径规划系统,其特征在于,还包括与所述A*算法路径规划模块连接的行进速度限制模块,用于根据所述移动机器人通过的当前栅格的通行值,设定所述移动机器人的行进速度。
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CN112284393B (zh) * | 2020-10-23 | 2022-12-23 | 苏州大学 | 一种智能移动机器人全局路径规划方法和系统 |
CN113284240B (zh) * | 2021-06-18 | 2022-05-31 | 深圳市商汤科技有限公司 | 地图构建方法及装置、电子设备和存储介质 |
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