Robot Touch Feedback Using IMU-Based Force Recognition
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Solution Overview
Problem
Smart robots struggle to accurately execute feedback events due to external factors affecting their anthropomorphism, as they cannot reliably discern the force and type of user interactions through conventional tactile sensors.
Innovation Solution
Incorporating an inertial measurement unit (IMU) and touch sensors on the robot to detect changes in heading angle in response to user interactions, allowing the robot to determine the force and type of operation based on offset angles, enabling precise execution of corresponding control events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the robot uses only touch sensors to recognize operations, then the device complexity is low, but the measurement precision of operation force is insufficient
Solution Approach 1:
The patent introduces an inertial measurement unit (IMU) as an intermediary device to indirectly measure operation force. Instead of using complex force sensors directly on the touch surface, the IMU detects changes in robot body acceleration and orientation caused by user operations, converting mechanical interactions into measurable inertial data. This intermediary approach enables force detection without direct mechanical contact sensors.
Solution Approach 2:
The patent replaces traditional mechanical force sensors with an inertial measurement system. By substituting direct mechanical measurement with inertial sensing (accelerometers, gyroscopes), the system achieves force detection capability while reducing mechanical complexity. The IMU converts mechanical operation forces into electrical signals through inertial effects, eliminating the need for complex mechanical force transduction mechanisms.
2Adaptability or versatility
If the robot adds IMU and multiple sensors to improve anthropomorphism, then the measurement precision of external factors improves, but the device complexity increases
Solution Approach 1:
The patent makes the IMU serve multiple functions: detecting operation force, determining operation direction, and identifying operation intensity. A single IMU device replaces what would otherwise require multiple specialized sensors, achieving versatile operation recognition (force, direction, intensity) while minimizing the increase in device complexity. The multi-functional use of the IMU enables comprehensive anthropomorphic feedback without proportionally increasing system complexity.
Solution Approach 2:
The patent combines multiple sensing capabilities (acceleration detection, orientation detection, force inference) into a single integrated IMU system. By merging these functions into one device rather than using separate sensors for each parameter, the system achieves high adaptability for recognizing various operation types while keeping the overall sensor system compact and manageable.
3Reliability
If the robot uses touch sensors alone, then the ease of operation is maintained, but the reliability of control event execution deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring IMU data during user operations and using this information to adjust and confirm operation recognition. The system compares expected operation patterns with actual IMU measurements, providing feedback validation that enhances the reliability of control event execution. This feedback mechanism ensures that operations are correctly interpreted even in ambiguous situations.
Solution Approach 2:
The patent performs preliminary analysis of IMU data to predict operation type and force before finalizing control event execution. By pre-processing and analyzing inertial measurement data in advance, the system can prepare appropriate responses and validate operation intentions, improving the reliability of subsequent control event execution without complicating the user interaction process.
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 solution enhances the robot's ability to accurately respond to user interactions by considering factors like force, location, and operation type, thereby improving anthropomorphism.
Implementation Method 1
an inertial measurement unit (IMU) is mounted in the robot... the IMU is configured to collect a heading angle of the robot
Data Source
AI summary
A robot feedback method includes that an IMU is mounted in the robot, a plurality of first preset regions are provided with a touch sensor, the touch sensor is configured to collect an operation acting on the robot, and the IMU is configured to collect a heading angle of the robot. The robot receives a first operation acting on a first region of the first preset regions. In addition, the robot obtains location information of the first region, an operation type of the first operation, and a first offset reflecting a force of the first operation acting on the robot. Then the robot executes a first control event corresponding to the location information of the first region, the operation type of the first operation, and the force of the first operation acting on the robot.