Autonomous Lawn Mower Navigation With Multi-Sensor Obstacle Mapping
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Solution Overview
Problem
Autonomous lawn mowers face challenges in navigating diverse and complex garden landscapes due to unpredictability and varying terrain, leading to inadequate performance compared to traditional push mowers.
Innovation Solution
An autonomous lawn mower equipped with a navigation system that includes multiple modules such as odometry, optical surveying, sonic obstacle detection, and inertial measurement units, which work together to provide navigation information for the mower to control its movement and operation within a predefined area, using sensors like LIDAR, sonar, and GPS to map the environment and avoid obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a navigation system with multiple modules is added to the autonomous lawn mower, then the navigation precision and obstacle detection capability are improved, but the device complexity increases
Solution Approach 1:
The navigation system is divided into separate functional modules: odometry module for movement tracking, optical surveying module for mapping, sonic obstacle detection module for obstacle identification, and inertial measurement unit for orientation sensing. Each module independently performs its specific function, allowing for modular design and maintenance while achieving comprehensive navigation capability.
Solution Approach 2:
Multiple navigation modules are integrated into a unified navigation system that processes information from all sensors together. The controller combines data from odometry, optical surveying, sonic detection, and inertial measurement to make coordinated navigation decisions, achieving synergistic effect that improves overall navigation precision.
2Reliability
If multiple sensors and navigation modules are integrated into the autonomous lawn mower, then the reliability of navigation is improved, but the manufacturing cost increases
Solution Approach 1:
The navigation system is designed to perform multiple functions using a integrated set of modules: the odometry module tracks movement, the optical surveying module maps the environment, the sonic obstacle detection module identifies obstacles, and the inertial measurement unit provides orientation data. This multi-functional design improves navigation reliability while avoiding the need for separate specialized systems for each function.
Solution Approach 2:
The system performs preliminary mapping of the operating area using the optical surveying module before actual mowing operations begin. This preliminary action creates a reference map that enhances subsequent navigation reliability, allowing the mower to operate more reliably without requiring repeated expensive sensor deployments.
3Productivity
If the navigation system uses multiple modules to track movement and detect obstacles, then the productivity of lawn mowing is improved, but the device complexity increases
Solution Approach 1:
The navigation system continuously receives feedback from all modules during operation: odometry provides ongoing movement data, optical surveying updates the environmental map, sonic detection identifies new obstacles, and the inertial measurement unit tracks orientation changes. This real-time feedback enables the controller to dynamically adjust the mower's path, improving productivity by avoiding obstacles and re-optimizing routes without requiring manual intervention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The navigation system enables the autonomous lawn mower to efficiently navigate and maintain lawns with varying terrain, improving performance and reducing manual intervention by accurately tracking movement and detecting obstacles, allowing for more precise and reliable operation.
Implementation Method 1
The navigation system includes an optical surveying module arranged to scan and survey the proximate area around the mower to devise the surveyed representation of the predefined operating area
Implementation Method 2
an optical surveying module arranged to scan and survey the proximate area around the mower
Implementation Method 3
a sonar unit arranged to detect any obstacles proximate to the mower
Implementation Method 4
the direction of the mower can be obtained by a magnetometer arranged to provide a bearing of the mower
Implementation Method 5
the orientation of the mower, in 3 axes, may be obtained by a gyroscope arrangement
Implementation Method 6
an Inertial measurement unit (IMU) with an accelerometer or a barometer
Data Source
AI summary
An autonomous lawn mower (100) comprises a mower body (102) having at least one motor (210) arranged to drive a cutting blade (212b) and to propel the mower body (102) on an operating surface via a wheel arrangement. The mower body (102) includes a navigation system (204) arranged to assist a controller (202) to control the operation of the mower body (102) within the predefined operating area (208). The navigation system includes an odometry module (106, 220), a rotatable optical surveying module (222), a sonic obstacle detection module (224), a heat absorbing unit set on the outer surface of the mower body (102) for directing the heat generated within the mower body towards the atmosphere, and a detachable docking module (816) arranged to receive the mower body (102).