Robot Vacuum Fall Sensor Layout for Redundant Slope Detection
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Solution Overview
Problem
Automatically moving floor treatment appliances face safety risks due to potential failures in fall sensors, which can lead to accidents when detecting slopes, as a single defective sensor may not recognize a slope, causing the appliance to fall.
Innovation Solution
The appliance is equipped with multiple fall sensors arranged in two rows on its underside, with inner sensors offset from outer sensors, forming redundant evaluation circuits to independently detect slope presence and identify defective sensors, ensuring continued safe operation even if one row fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single fall sensor is used to detect slopes, then the device complexity is reduced, but the reliability decreases because a defective sensor may fail to recognize a slope, causing the appliance to fall
Solution Approach 1:
The patent implements redundancy by providing multiple fall sensors (at least two) that replicate the detection function. Each sensor copies the slope detection capability, ensuring that if one sensor fails, another can still detect the slope and prevent the appliance from falling. This directly addresses the reliability issue without requiring fundamentally new detection mechanisms.
Solution Approach 2:
The system prepares for potential sensor failure by having backup sensors in place before any defect occurs. The evaluation circuit is designed to handle defective sensors beforehand, continuously monitoring multiple sensors and having predetermined responses ready. This ensures that when a sensor actually fails, the system can immediately switch to using the remaining functional sensors without compromising safety.
2Reliability
If multiple fall sensors are arranged in redundant configurations, then the reliability improves by preventing falls even with defective sensors, but the device complexity increases due to multiple sensors and evaluation circuits
Solution Approach 1:
The patent divides the sensor system into functionally independent segments - multiple individual fall sensors distributed at different positions on the appliance. Each sensor operates independently and covers specific detection zones. This segmentation allows the system to maintain overall functionality even when individual segments (sensors) fail, managing complexity through modular organization rather than a monolithic sensor system.
Solution Approach 2:
The sensors are arranged in different spatial positions and orientations on the appliance housing, creating a three-dimensional detection network. This spatial distribution adds dimensional redundancy - sensors are not just duplicated but placed in different locations to detect slopes from various angles and positions, thereby managing complexity through spatial optimization rather than simple numerical multiplication.
3Reliability
If fall sensors are arranged to cover all possible slope directions, then the reliability improves, but the manufacturing precision requirements increase to ensure proper sensor positioning
Solution Approach 1:
Different sensors are positioned at specific locations on the appliance housing, each optimized to detect slopes in particular directions or zones. Rather than requiring all sensors to be identical and perfectly positioned, each sensor has its local detection responsibility. This allows the system to achieve comprehensive coverage through strategic local positioning rather than requiring uniform high-precision placement of all sensors.
Solution Approach 2:
The sensor arrangement utilizes asymmetric positioning where sensors are placed at different orientations and locations based on the appliance geometry and expected slope scenarios. This asymmetric layout optimizes detection coverage for the specific application while reducing manufacturing precision requirements compared to a symmetric arrangement that would require exact positioning tolerances. The asymmetric design allows each sensor to cover its specific zone effectively without demanding ultra-precise alignment.
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 redundancy prevents falls by allowing the appliance to continue moving until inner sensors detect a slope, ensuring timely reaction and preventing accidents, while also transmitting error signals to users for maintenance, thus enhancing operational safety.
Implementation Method 1
a detection means (4), which has at least one fall sensor (8-15) arranged on an underside (7) of the appliance housing (2) facing a surface (6), which is configured to detect a distance of the floor treatment appliance from the surface (6)
Data Source
AI summary
An automatically moving floor treatment appliance has an appliance housing, a drive, a detector for detecting surrounding area features, and a computer that transmits control commands to the drive, based on the surrounding area features detected by the detector. The detector has a plurality of inner and outer fall sensors arranged on an underside of the appliance housing, which detect a distance of the floor treatment appliance from the surface. The computer controls the drive to change a movement of the floor treatment appliance when the distance detected by the fall sensor is greater than a threshold value defining a slope. The fall sensors are interconnected in an evaluation circuit of the detection means so that the detection signals of the totality of inner fall sensors can be evaluated independently of the detection signals of the totality of outer fall sensors.