E-Bike Motor Braking Control Through Reverse Pedaling
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Solution Overview
Problem
Existing electric bicycles require additional complex components like coaster brakes for deceleration control when pedaling in reverse, complicating the system and increasing part count.
Innovation Solution
A method and system that generates deceleration torque in the driving motor based on the moving distance of the pedal when rotated in reverse, allowing for regenerative braking and charging, without the need for separate braking devices, using a system controller to manage current flow and pedal torque commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coaster brake is added to enable deceleration control when pedaling in reverse, then deceleration functionality is improved, but device complexity increases
Solution Approach 1:
The patent merges the deceleration function into the existing driving motor by controlling it to generate deceleration torque when the pedal rotates in reverse. This combines the motor's propulsion function with braking function, eliminating the need for a separate coaster brake device and reducing overall system complexity while maintaining deceleration capability
Solution Approach 2:
The driving motor is designed to perform multiple functions: it provides acceleration torque during forward pedaling and deceleration torque during reverse pedaling. This multi-functionality allows a single component to handle both propulsion and braking, reducing the need for additional specialized parts
2Reliability
If additional braking devices are installed for reverse pedal rotation, then braking reliability is improved, but manufacturing cost increases
Solution Approach 1:
The braking function is merged into the existing driving motor control system. The motor controller generates deceleration torque commands based on pedal rotation detection, eliminating the need for separate braking devices and reducing manufacturing complexity while ensuring reliable deceleration control
3Ease of operation
If a separate coaster brake is used for reverse pedaling deceleration, then deceleration performance is improved, but energy efficiency deteriorates
Solution Approach 1:
The patent converts the energy that would be wasted during regenerative braking into useful electrical energy by controlling the driving motor to generate deceleration torque. When the pedal rotates in reverse, the motor acts as a generator, recovering kinetic energy and converting it to electrical energy that can be stored in the battery, thus transforming energy loss into energy recovery
Solution Approach 2:
The control system changes the operational parameters of the driving motor based on pedal rotation direction. During reverse pedaling, the motor operates in regenerative braking mode, changing from motor mode to generator mode, which enables energy recovery while providing deceleration control
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
Simplifies braking control by eliminating the need for additional braking devices, providing proportional deceleration torque through pedal rotation, enhancing convenience and reducing system complexity while allowing for efficient energy recovery.
Implementation Method 1
generating a deceleration torque command of a driving motor based on a moving distance of a pedal if a driver rotates the pedal installed in the electric bicycle in a reverse direction while the electric bicycle is driving; controlling a current supplied to the driving motor according to the deceleration torque command; and generating a deceleration torque of the driving motor by the current control
Implementation Method 2
if the driver rotates the pedal installed in the electric bicycle in the reverse direction, the driving motor may generate electrical energy by regenerative braking and the current supplied to the driving motor may be controlled by using the generated electrical energy
Data Source
AI summary
A method and system for controlling an electric bicycle are provided. The method may comprise: driving the electric bicycle; generating a deceleration torque command of a driving motor based on a moving distance of a pedal if a driver rotates the pedal installed in the electric bicycle in a reverse direction while the electric bicycle is driving; controlling a current supplied to the driving motor according to the deceleration torque command; and generating a deceleration torque of the driving motor by the current control.