E-Bike Smooth Ramp Up Acceleration Control
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Solution Overview
Problem
Conventional E-Bikes experience jerky acceleration transitions and stability issues due to sudden changes in power assist, which can lead to uncomfortable riding experiences and potential loss of control, especially when transitioning to target cruising speeds.
Innovation Solution
A Smooth Ramp Up acceleration system that incrementally reduces the rate of acceleration as the E-Bike approaches the target cruising speed, providing a seamless transition from acceleration to power assist mode without manual throttle operation, using a controller and motorized propulsion subsystem to manage the acceleration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional E-Bikes use sudden acceleration to reach target speed, then acceleration time is reduced, but rider comfort and stability deteriorate due to jerky transitions
Solution Approach 1:
The system dynamically adjusts the acceleration rate based on the current speed relative to target speed. When the difference is large, maximum acceleration is applied; when the difference is small, acceleration is gradually reduced. This dynamic adjustment resolves the contradiction by optimizing acceleration time while maintaining rider comfort throughout the acceleration process.
Solution Approach 2:
The acceleration parameter is changed based on the speed difference threshold. The system transitions from a constant high acceleration parameter to a gradually decreasing acceleration parameter as the E-Bike approaches target speed. This parameter change strategy enables both quick acceleration and smooth transitions, resolving the contradiction between speed and comfort.
2Speed
If E-Bikes provide maximum power assist acceleration, then speed increase is rapid, but stability and control deteriorate due to sudden momentum changes
Solution Approach 1:
The system applies maximum power assist acceleration dynamically only when the speed difference exceeds the threshold. As the E-Bike approaches target speed, the power assist is gradually reduced. This dynamic control enables rapid speed increase while preventing instability caused by sudden momentum changes near the target speed.
Solution Approach 2:
The system anticipates potential instability by gradually reducing acceleration before the E-Bike reaches target speed. This preliminary anti-action prevents the harmful effect of sudden momentum changes and maintains vehicle stability throughout the acceleration process.
3Adaptability or versatility
If E-Bikes use manual throttle operation for acceleration, then acceleration control is flexible, but operation complexity increases and unintended high speeds may occur
Solution Approach 1:
The system performs self-service by automatically controlling acceleration based on the selected target speed. The controller monitors current speed, calculates the difference from target speed, and adjusts power assist accordingly without requiring continuous manual throttle input. This eliminates operation complexity while maintaining acceleration flexibility through programmable speed modes.
Solution Approach 2:
The system uses feedback from speed sensors to continuously monitor current speed and adjust power assist levels. This closed-loop control enables automatic acceleration to target speed while preventing unintended high speeds, resolving the contradiction between control flexibility and operation complexity.
Data Source
AI summary
The disclosed principles provide for acceleration systems and related methods for use with power assisted vehicles, such as E-Bikes. Disclosed systems and methods provide for a quick ramp up feature that accelerates the vehicle at a predetermined acceleration rate, but then smoothly integrates into the target cruising speed of the current speed mode by incrementally reducing the rate of acceleration as the vehicle approaches the target cruising speed, thereby reducing or eliminating any jolt or jerky feeling felt during the transition from acceleration to target cruising speed.