Regenerative Torque Control for Natural Braking Feel on Motorcycles
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Solution Overview
Problem
Electric vehicles lack the ability to replicate the braking feeling experienced in traditional vehicles, leading to discomfort for users familiar with engine vehicles when regenerative braking is applied, as the deceleration sensation is different.
Innovation Solution
A regeneration control method that determines the required regenerative torque based on the degree of decrease in the accelerator operation amount over time, using a processing circuitry to adjust the torque dynamically between a strong regenerative torque and a normal torque, ensuring the braking feeling aligns with the user's intention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking control is performed in electric vehicles, then energy recovery efficiency is improved, but braking feeling comfort deteriorates
Solution Approach 1:
The patent applies dynamics by making the regenerative torque adjustable and time-varying. The control device dynamically adjusts the regenerative torque based on the accelerator operation amount decrease rate, transitioning from a first regenerative torque to a second regenerative torque over time. This dynamic adjustment allows the system to optimize energy recovery while adapting to changing driver intentions and vehicle states, thereby improving braking comfort during regenerative braking.
Solution Approach 2:
The patent changes the torque parameter dynamically during regenerative braking. By calculating the accelerator operation amount decrease rate and using it to determine the appropriate regenerative torque magnitude, the system adjusts the braking force parameter to match driver expectations. This parameter change approach ensures that energy recovery is maximized while the braking feeling remains comfortable and predictable for the driver.
2Speed
If strong regenerative torque is applied, then deceleration performance is improved, but braking feeling alignment with user intention deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring the accelerator operation amount and its decrease rate. This feedback information is used to adjust the regenerative torque in real-time, ensuring that the braking force aligns with the driver's deceleration intention. The control device uses the accelerator operation decrease rate as a feedback signal to determine whether to apply stronger or weaker regenerative torque, creating a closed-loop control system that improves both deceleration performance and braking feeling alignment.
Solution Approach 2:
The system dynamically transitions between different torque levels based on the driver's operation. By making the regenerative torque time-varying and adaptive to the accelerator operation decrease rate, the system can provide strong deceleration when needed while maintaining alignment with user intention throughout the braking 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
This method allows for a braking force that matches the user's intention, reducing discomfort for those accustomed to engine vehicles by dynamically adjusting regenerative torque, thereby enhancing the braking experience.
Implementation Method 1
an electric motor serving as a drive source for driving the driving wheel... determine a required regenerative torque, which is the regenerative torque required for the electric motor
Data Source
AI summary
There are provided a regeneration control method for a vehicle and a straddle-type vehicle which is an example of the vehicle. The regeneration control method is executed in a processing circuitry of the vehicle including an electric motor as a drive source, and the regeneration control method includes: determining whether a start condition of regeneration control for requesting the electric motor to generate a regenerative torque is satisfied; acquiring a degree of decrease in an accelerator operation amount with lapse of time before start of the regeneration control; and determining a required regenerative torque, which is the regenerative torque required for the electric motor, based on the degree of decrease in the accelerator operation amount.