Drive-By-Wire Steering Feedback for Simulated Caster Stability
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Solution Overview
Problem
Existing drive-by-wire steering systems in power equipment lack effective feedback mechanisms to improve drivability, particularly in off-road conditions, as they do not simulate the mechanical feel and stability provided by traditional mechanical linkages.
Innovation Solution
A drive-by-wire steering system that includes a steering interface system and a power steering system connected via a communication link, which provides resistive torque and haptic feedback to the user based on data from the power steering system, simulating mechanical feedback and enhancing directional stability through simulated caster effects and other torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If drive-by-wire technology is used to replace mechanical linkages in power equipment steering systems, then control flexibility and electronic integration are improved, but the mechanical feel and directional stability are worsened
Solution Approach 1:
The patent implements a feedback mechanism where steering position encoders continuously monitor the steering element position and feed this information back to the controller. The controller then adjusts the steering interface position motor to provide resistive torque that simulates mechanical feedback, creating a closed-loop system that restores directional stability while maintaining electronic control benefits
Solution Approach 2:
The patent introduces an intermediary feedback system that mediates between the electronic control system and the steering operator. The steering interface position motor acts as an intermediary component that translates electronic control signals into tactile feedback forces, bridging the gap between electronic automation and mechanical feel
2Measurement precision
If drive-by-wire steering systems are implemented in power equipment, then control precision is improved, but the mechanical feedback and haptic feel are lost
Solution Approach 1:
The system uses steering position encoders to precisely measure steering element position and provides feedback through the steering interface position motor. This feedback loop restores mechanical feel by applying resistive torque that simulates the tactile information normally provided by mechanical linkages, preventing loss of mechanical feedback information
Solution Approach 2:
The patent creates a virtual copy of mechanical feedback by using the steering interface position motor to simulate the tactile sensations that would normally be transmitted through physical mechanical linkages. This copying approach preserves the feel of mechanical connection while maintaining the benefits of electronic drive-by-wire control
3Stability of the object's composition
If traditional mechanical linkages are used for steering control, then directional stability and mechanical feel are maintained, but system complexity and weight increase
Solution Approach 1:
The patent replaces complex mechanical linkages with an electronic drive-by-wire system consisting of motors, encoders, and controllers. This substitution reduces mechanical complexity and weight while maintaining directional stability through electronic feedback control that simulates mechanical behavior
Solution Approach 2:
The system changes the control parameters from purely mechanical to electro-mechanical hybrid by introducing electronic sensors and actuators. The steering interface position motor controller adjusts torque parameters dynamically to simulate mechanical linkage characteristics, maintaining stability while reducing physical mechanical complexity
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 system improves drivability by providing realistic steering feedback, reducing oversteering and enhancing directional stability, even in off-road conditions, while allowing for more intuitive and responsive steering control.
Implementation Method 1
one or more steering interface motors configured to rotate the steering interface; and one or more steering interface motor controllers configured to control activation of the one or more steering interface motors to apply one or more torques to the steering interface
Implementation Method 2
one or more steering motors configured to drive the one or more steering elements; and one or more steering motor controllers configured to control activation of the one or more steering motors to drive the one or more steering elements toward a target output angular displacement
Data Source
AI summary
A drive-by-wire steering system for a power equipment device is provided. One example embodiment comprises a steering interface system, a power steering system, and a communication link connecting the steering interface system and power steering system. The power steering system can adjust an output angular displacement of steering elements of the power equipment device based on inputs received from the steering interface system. The steering interface system can receive user inputs and provide powered feedback and/or a simulated caster effect via a steering interface. Additional embodiments include power equipment devices and steering interface systems.