EV Regenerative Braking Control for Stable One-Pedal Turning
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Solution Overview
Problem
Existing electric vehicle control systems with one-pedal operation do not adequately consider driver operability during turns, particularly when regenerative braking is executed via accelerator pedal release.
Innovation Solution
An electric vehicle control system that adjusts the rate of regenerative braking force based on accelerator pedal operation and vehicle turn information, using control commands to manage torque changes and maintain stable vehicle behavior during turns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the stroke amount of the accelerator pedal at which switching is executed between driving force and braking force is changed in response to vehicle body speed, then regenerative braking control is optimized for different speeds, but operability during vehicle turns is degraded
Solution Approach 1:
The switching stroke amount is made dynamically adjustable based on both vehicle speed and steering angle. When the steering angle exceeds a predetermined threshold, the switching stroke amount is increased to delay the transition from driving force to braking force, thereby improving operability during turns while maintaining speed-based optimization during straight travel
Solution Approach 2:
The control system changes the parameter of switching stroke amount based on multiple conditions including vehicle speed and steering angle. By introducing steering angle as an additional parameter, the system resolves the contradiction between speed-based optimization and turn-based operability
2Use of energy by moving object
If regenerative braking force is applied during vehicle turns, then energy recovery is achieved, but vehicle stability is degraded due to torque changes affecting steering
Solution Approach 1:
The system applies preliminary anti-action by delaying the onset of regenerative braking force during turns. When the steering angle exceeds the threshold, the switching stroke amount is increased, which prevents the abrupt application of braking force that would otherwise destabilize the vehicle during steering operations
Solution Approach 2:
The regenerative braking control is made dynamic by conditionally adjusting the switching stroke amount based on steering angle. This dynamic adjustment allows the system to balance energy recovery with vehicle stability by modulating braking force application according to real-time steering conditions
Data Source
AI summary
An electric vehicle control device, an electric vehicle control method, and an electric vehicle control system according to one embodiment of the present invention are configured to: obtain, based on operation information on release of an accelerator pedal of a vehicle and turn information on a turn of the vehicle, change rate information on a temporal change amount of a regenerative braking force with respect to an operation amount of the accelerator pedal; and output a regenerative braking control command for applying the regenerative braking force to a wheel based on the change rate information.