Ultrasonic Obstacle Avoidance for Continuous Self-Moving Navigation
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Solution Overview
Problem
Self-moving devices, such as autonomous lawn mowers, face challenges in navigating around obstacles without collision, as existing technologies lack effective non-contact obstacle avoidance mechanisms.
Innovation Solution
The implementation of an ultrasonic sensor assembly with multiple sensors arranged at angles to form overlapping detection regions, allowing the control module to determine obstacle locations and distances, and control the device to steer or decelerate accordingly to maintain a safe distance and avoid obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the self-moving device stops or reverses when detecting an obstacle, then collision is avoided, but directional continuity is broken and grass cutting efficiency decreases
Solution Approach 1:
The patent implements dynamic obstacle avoidance by enabling the lawn mower to steer around obstacles while maintaining continuous forward motion. The control system dynamically adjusts the steering angle based on obstacle detection, allowing the device to navigate around obstacles without stopping or reversing, thus preserving directional continuity and grass cutting efficiency while still achieving reliable obstacle avoidance
Solution Approach 2:
The patent uses preliminary obstacle detection through ultrasonic sensors to identify obstacles before the lawn mower reaches them. The control system calculates the appropriate steering angle in advance based on the detected obstacle position, enabling the device to smoothly divert around the obstacle while maintaining continuous operation, thereby avoiding collisions without breaking directional continuity
2Device complexity
If a single ultrasonic sensor is used, then device complexity is reduced, but obstacle detection accuracy and coverage are insufficient
Solution Approach 1:
The patent divides the obstacle detection function into multiple segments by using several ultrasonic sensors arranged at different angles on the lawn mower. Each sensor covers a specific detection zone, and their combined coverage provides comprehensive obstacle detection accuracy and wide coverage while maintaining relatively simple device structure
Solution Approach 2:
The patent merges the detection capabilities of multiple ultrasonic sensors into a unified detection system. The control system integrates signals from all sensors to determine obstacle position and calculate steering angles, achieving enhanced measurement precision and comprehensive coverage through the combined action of multiple simple sensor components
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
Enables non-contact obstacle avoidance, preventing collisions and ensuring continuous operation by accurately detecting and navigating around obstacles, thereby extending the service life of self-moving devices.
Implementation Method 1
an ultrasonic sensor assembly with multiple sensors arranged at angles to form overlapping detection regions, allowing the control module to determine obstacle locations and distances
Data Source
AI summary
The invention relates to a self-moving device, including: a housing, a movement module configured to drive the housing to move, a drive module configured to drive the movement module to move, and a control module configured to control the self-moving device. A non-contact obstacle recognition sensor assembly is disposed on the housing. After the obstacle recognition sensor assembly detects that an obstacle exists in a movement direction, the control module controls the self-moving device to continue moving and steer until the obstacle is avoided. The movement direction is a forward driving direction of the self-moving device.