Wall following robot
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Solution Overview
Problem
Mobile robots face difficulties in traversing surfaces adjacent to obstacles like walls due to their design and navigation patterns, which often result in missed cleaning areas, especially in tight spaces or corners.
Innovation Solution
The implementation of a method for controlling a cleaning robot that employs a bumper with linear sensors to detect force and maintain a consistent compression range while navigating along walls, allowing the robot to track obstacles and clean hard-to-reach areas by adjusting its movement based on sensor feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mobile robot uses traditional navigation patterns to traverse surfaces, then it can clean open areas efficiently, but it cannot reach surfaces adjacent to walls and obstacles
Solution Approach 1:
Instead of having the robot navigate around obstacles using traditional patterns, the robot inverts the approach by actively seeking out and following walls and obstacles. The robot uses its bumper to detect walls and then follows them, turning the obstacle itself into a navigation guide rather than a barrier to avoid.
Solution Approach 2:
The robot employs a linear sensor on the bumper that provides continuous feedback about contact with walls. The controller monitors the position of the bumper relative to the robot body and adjusts movement in real-time based on this feedback, enabling the robot to maintain proper contact and follow walls effectively.
2Measurement precision
If the robot maintains contact with walls using bumper compression, then it can follow walls accurately, but the bumper must be precisely positioned within a compression range
Solution Approach 1:
The linear sensor on the bumper provides continuous feedback about the bumper's position and compression state. The controller uses this feedback to monitor whether the bumper is within the desired compression range and adjusts the robot's movement to maintain proper contact with the wall.
Solution Approach 2:
The bumper is designed to be compressible and naturally seeks out the optimal compression range through the robot's movement and the physical interaction with the wall. The system leverages the physical properties of the bumper itself to achieve proper positioning, reducing the need for complex active control mechanisms.
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
This approach enables the robot to effectively clean surfaces adjacent to walls and in tight spaces by maintaining contact and adjusting its movement to ensure consistent friction, thereby improving coverage and accessibility in areas that would be missed by traditional navigation patterns.
Implementation Method 1
a bumper (110) of the robot can be compressed
Implementation Method 2
friction between the wall and the bumper
Data Source
Figure 1A
Figure 1B~1C
Figure 1D~1E
AI summary
An example robot includes a body that is movable relative to a surface, a bumper mounted on the body to enable movement of the bumper relative to the body, a sensor to produce a signal in response to the movement of the bumper relative to the body caused by contact between the bumper and the surface, and a controller to control movement of the body to cause the body to track the surface based on a value. The bumper is movable between an uncompressed position relative to the body and a compressed position relative to the body. The signal varies linearly with the movement of the bumper relative to the body. The value is based on the signal and indicates that the bumper in a partially compressed position has a compression range between the uncompressed position and the compressed position.