Regenerative Braking Control via Wheel Speed Deviation
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Solution Overview
Problem
Existing vehicle regenerative braking systems inhibit regenerative braking during cornering, which adversely affects fuel economy and cornering behavior stability.
Innovation Solution
A regenerative braking control apparatus that measures wheel speed deviation between the front and rear wheels and adjusts regenerative braking effort accordingly during cornering, prioritizing regenerative braking when the vehicle is traveling straight and limiting it during cornering to maintain stability and improve fuel economy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If regenerative braking is constantly inhibited during cornering, then cornering behavior stability is improved, but fuel economy deteriorates
Solution Approach 1:
The system dynamically adjusts the regenerative braking control strategy based on real-time vehicle operating conditions. During cornering, the control unit calculates the degree of cornering and dynamically switches between different control modes (first control mode with inhibition and second control mode without inhibition), allowing the system to adapt to varying stability requirements while maximizing energy recovery opportunities.
Solution Approach 2:
The control unit changes the regenerative braking effort parameter based on the calculated degree of cornering. When the degree of cornering is below a threshold, the system applies regenerative braking effort to improve fuel economy. When the degree exceeds the threshold, the system inhibits regenerative braking to maintain cornering stability, thus optimizing the trade-off between energy recovery and vehicle stability.
2Use of energy by moving object
If regenerative braking effort is increased during cornering, then fuel economy is improved, but cornering behavior stability deteriorates
Solution Approach 1:
The control unit continuously monitors vehicle operating parameters including wheel speeds, steering angle, and lateral acceleration to calculate the degree of cornering. This feedback mechanism allows the system to detect cornering conditions and adjust the regenerative braking effort accordingly, preventing stability deterioration while maximizing energy recovery during appropriate conditions.
Solution Approach 2:
The system transitions from a static inhibition strategy to a dynamic control strategy that adjusts regenerative braking effort based on real-time cornering detection. The control unit dynamically determines whether to apply or inhibit regenerative braking by comparing the calculated degree of cornering against predetermined thresholds, enabling optimal balance between fuel economy and stability.
3Loss of energy
If regenerative braking is allowed during cornering, then energy recovery is optimized, but understeer occurs
Solution Approach 1:
The system replaces constant mechanical inhibition of regenerative braking with an intelligent control system that uses sensor data and calculations to dynamically determine when regenerative braking is safe to apply. This substitution of pure mechanical control with electronic control and algorithms allows for more nuanced decision-making that optimizes energy recovery while preventing understeer conditions.
Data Source
AI summary
A regenerative braking control apparatus for a wheeled vehicle, includes: a regenerative braking unit arranged to produce a regenerative braking effort for the vehicle; and a control unit connected for signal communication to the regenerative braking unit, and configured to perform the following: measuring a wheel speed deviation defined as a difference between a speed of a front wheel set of the vehicle and a speed of a rear wheel set of the vehicle; and controlling the regenerative braking effort in accordance with the wheel speed deviation during cornering. The control unit is configured to control the regenerative braking effort to decrease with an increase in the wheel speed deviation during cornering braking, and configured to perform braking for the vehicle in accordance with an operation of slowdown request, prioritizing a regenerative braking effort for one of the front wheel set and the rear wheel set of the vehicle.