Multi-Axle Regenerative Braking Surplus Transfer
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Solution Overview
Problem
Existing systems for regenerative braking in vehicles with multiple axles face challenges in seamlessly integrating regenerative and friction braking without interfering with anti-lock braking, limiting the effectiveness of regenerative braking across all axles.
Innovation Solution
A method and system that determine brake demand and regenerative braking availability for each axle, utilizing surplus regenerative braking from one axle to support another and applying friction braking when necessary to ensure maximum regenerative braking capability while minimizing anti-lock braking mode operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking is applied to multiple axles simultaneously, then energy recovery capacity is improved, but risk of anti-lock braking interference increases
Solution Approach 1:
The braking system is segmented by axle, with each axle independently evaluating its regenerative braking availability and demand. The controller manages each axle's regenerative braking separately, allowing surplus energy from one axle to be transferred to another only when specific conditions are met, thus preventing anti-lock interference while maximizing energy recovery
Solution Approach 2:
The system dynamically adjusts regenerative braking limits based on real-time conditions including post-ABS event status. After an anti-lock braking event, the system temporarily reduces regenerative braking limits and gradually increases them as conditions permit, creating a dynamic adaptation mechanism that prevents interference while optimizing energy recovery
2Reliability
If regenerative braking limits are set conservatively to avoid anti-lock interference, then braking stability is improved, but regenerative braking effectiveness deteriorates
Solution Approach 1:
The system performs preliminary evaluation of regenerative braking availability and demand for each axle before applying braking forces. By预先 assessing whether an axle has surplus regenerative capacity and whether another axle has unmet demand, the system can proactively transfer energy without triggering anti-lock conditions, thus maintaining stability while improving effectiveness
Solution Approach 2:
The system changes the regenerative braking limit parameter dynamically based on operating conditions. After an ABS event, the limit is initially set to the brake torque achieved at the end of the ABS event, then gradually increased toward the maximum achievable regenerative braking, allowing the system to adapt to changing conditions and optimize performance
3Power
If friction braking is used to meet unmet braking demand, then braking performance is improved, but energy recovery opportunity is lost
Solution Approach 1:
The controller acts as an intermediary that transfers surplus regenerative braking capacity from one axle to another through the electrical system. This intermediary mechanism allows energy recovery to continue serving braking demands across different axles, reducing the need for friction braking and preserving energy recovery opportunities
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 approach maximizes regenerative braking capacity across all vehicle axles, enhancing battery regeneration and reducing the reliance on friction braking, thereby optimizing energy recovery and minimizing undesirable anti-lock braking operations.
Implementation Method 1
a motor-generator (206) connected to the drivetrain of the vehicle and a battery (212) for storing electrical energy
Data Source
AI summary
A system and method for maximizing the post-ABS regenerative braking capability of an automotive vehicle having regenerative braking available for more than one axle determines the availability of surplus regenerative braking capacity on a first axle and then uses the surplus, if any, to satisfy the brake demand for another axle having insufficient regenerative braking capacity. This system restores regenerative braking without causing the regenerative braking to trigger a subsequent ABS event.