Pedal Drive System Feedback Torque Control
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Solution Overview
Problem
Series-type hybrid electric vehicles lack the mechanical interaction and feedback torque that users expect, leading to an unexpected feel and potentially dangerous situations due to insufficient pedal resistance torque, especially when starting to pedal.
Innovation Solution
A pedal drive system with a control unit that applies controllable feedback torque based on a pedal reference trajectory, decoupling pedal drive control from wheel drive control, allowing for improved haptic feel and feedback while enhancing vehicle handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If series-type hybrid electric vehicle setup is used with generator mechanically coupled to pedals, then mechanical simplicity and flexibility are improved, but pedal resistance torque and haptic feedback deteriorate
Solution Approach 1:
The patent replaces the traditional mechanical transmission system (chain, belt, gears) with an electronic control system. The control unit electronically regulates the generator's resistance torque based on detected pedal rotation parameters, substituting mechanical feedback mechanisms with electronic sensing and control to achieve both simplicity and adequate resistance torque.
Solution Approach 2:
The patent implements a feedback control system where the control unit continuously detects pedal rotation parameters (speed, position, acceleration) and adjusts the generator's electromagnetic resistance torque accordingly. This closed-loop feedback ensures the pedals provide appropriate resistance during operation while maintaining mechanical simplicity.
2Device complexity
If series-type hybrid electric vehicle setup is used with generator mechanically coupled to pedals, then mechanical transmission components are eliminated, but unexpected pedal behavior and safety issues arise
Solution Approach 1:
The control unit continuously monitors pedal rotation parameters and adjusts the generator's resistance torque in real-time to match expected mechanical bicycle behavior. This feedback ensures predictable and safe pedal operation even without traditional mechanical transmission components.
Solution Approach 2:
The system proactively applies resistance torque through the generator before dangerous situations can occur. By continuously regulating electromagnetic resistance based on detected pedal parameters, the system prevents unexpected pedal behavior and maintains operator control and safety.
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 provides a more ergonomic pedaling experience by simulating the inertia of a mechanical bicycle, improving balance and stability, and allowing for better traction control on various surfaces.
Implementation Method 1
The provided input muscle power is converted into electric energy using a generator, which is mechanically coupled to the respective pedal, lever, or handle.
Implementation Method 2
The control unit comprises a haptic renderer, configured for control of said feedback torque based on at least one pedal reference trajectory.
Data Source
AI summary
A pedal drive system, in particular for an electric vehicle or a training apparatus, and for generating electrical power from muscle power of a user with at least one pedal and an electric generator, connected mechanically with said at least one pedal, is provided. To improve the haptic feel and feedback at the pedal, a control unit is provided for controlling a feedback torque, applied at said pedal, wherein the control unit comprises a haptic renderer, configured for control of said feedback torque based on at least one user-defined pedal reference trajectory.