Robot Bumper Layout for Discriminating Passable Obstacles
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Solution Overview
Problem
Robot cleaners lack the ability to discriminate between obstacles that can be passed over and those that cannot, leading to unnecessary detours and inefficient cleaning paths.
Innovation Solution
Incorporating a second bumper capable of sensing and discriminating surmountable obstacles, allowing the robot to pass over them while a first bumper senses obstacles to be avoided, enabling effective navigation and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single bumper sensor is used to detect obstacles, then the robot can sense obstacles, but it cannot discriminate between surmountable and avoidable obstacles, leading to unnecessary detours
Solution Approach 1:
The single bumper sensor is divided into two separate bumper sensors: a first bumper for detecting avoidable obstacles and a second bumper for detecting surmountable obstacles. This segmentation allows the robot to discriminate between different types of obstacles based on which bumper is triggered, resolving the contradiction by improving measurement precision while maintaining relatively simple device structure through modular sensor design.
2Productivity
If the robot makes detours to avoid all sensed obstacles, then obstacle avoidance is ensured, but cleaning efficiency decreases due to unnecessary path deviations
Solution Approach 1:
Different bumpers are positioned at different heights with different functional characteristics: the first bumper detects avoidable obstacles requiring detours, while the second bumper detects surmountable obstacles allowing continued forward motion. This local quality differentiation enables the robot to optimize its path by only detouring when necessary, thereby improving cleaning efficiency while maintaining reliable obstacle avoidance through differentiated sensor responses.
3Measurement precision
If the robot uses direct contact to estimate obstacle height, then accurate discrimination is achieved, but the robot may rotate the second bumper downward causing front end lifting
Solution Approach 1:
The second bumper is designed with a downward rotation capability that acts as a cushioning mechanism during obstacle contact. When the robot encounters a surmountable obstacle, the second bumper rotates downward to absorb the impact and estimate obstacle height, preventing excessive force transmission that would cause front end lifting. This beforehand designed rotation mechanism cushions the interaction between robot and obstacle, maintaining stability while enabling accurate height estimation.
Data Source
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AI summary
A robot includes a second bumper that senses an obstacle having such a height that can be passed over. Thus, the robot can pass over the obstacle without avoiding it.