Adaptive EV Regenerative Braking for Steady-Speed Coasting
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Solution Overview
Problem
Existing regenerative braking systems in electric vehicles (EVs) and hybrid electric vehicles (HEVs) are inefficient when maintaining constant high vehicle speeds, leading to repeated activation and deactivation of regenerative braking, resulting in energy loss compared to coasting without regenerative braking.
Innovation Solution
Adaptive regenerative braking profiles are implemented based on use case scenarios, including learning a driver's unique pedal oscillation profile to adjust the regenerative braking point, applying regenerative braking as a function of vehicle headway, and adjusting based on vehicle speed to optimize energy capture and reduce energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking is activated to capture energy during braking, then energy capture efficiency is improved, but repeated activation and deactivation at high speeds causes energy loss compared to coasting
Solution Approach 1:
The system dynamically adjusts the regenerative braking activation threshold based on vehicle speed. At high speeds above the threshold, the system deactivates regenerative braking to allow coasting, while at lower speeds below the threshold, it activates regenerative braking for energy capture. This dynamic adaptation resolves the contradiction by optimizing the activation strategy according to operating conditions.
Solution Approach 2:
The system changes the operational parameters of regenerative braking based on vehicle speed. By monitoring vehicle speed and comparing it to a predetermined threshold, the system adjusts whether regenerative braking is active or inactive, thereby optimizing energy capture efficiency while avoiding energy loss from repeated activation cycles at high speeds.
2Duration of action of moving object
If regenerative braking is activated to extend vehicle range, then vehicle range is improved, but mechanical brake wear increases due to repeated activation and deactivation
Solution Approach 1:
The system dynamically controls regenerative braking activation based on vehicle speed to reduce mechanical brake wear. By maintaining regenerative braking activation at appropriate speeds and avoiding repeated on/off cycling, the system extends vehicle range through energy recovery while minimizing wear on mechanical brake components.
Solution Approach 2:
The system maintains continuous regenerative braking activation within the optimal speed range rather than allowing repeated deactivation and reactivation. This continuous operation maximizes energy capture for extending vehicle range while preventing the mechanical brake wear that would result from frequent activation cycles.
3Use of energy by moving object
If regenerative braking point is set to capture maximum energy, then energy capture is improved, but driver pedal oscillation causes repeated activation and deactivation
Solution Approach 1:
The system changes the regenerative braking activation threshold parameter based on vehicle speed. By setting the threshold at an appropriate speed level, the system captures maximum energy during normal braking while avoiding the pedal oscillation issues that occur when the threshold is set too low, thereby maintaining ease of operation.
Solution Approach 2:
The system uses feedback from vehicle speed sensors to dynamically determine whether to activate regenerative braking. By continuously monitoring vehicle speed and comparing it to the threshold, the system responds appropriately to driver input while preventing unwanted repeated activation caused by pedal oscillation, thus maintaining both energy capture efficiency and ease of operation.
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
The adaptive regenerative braking system improves the efficiency of energy capture and use, reducing energy loss during braking and enhancing the overall performance and range of electric vehicles by better matching the braking profile to the driver's behavior and vehicle conditions.
Implementation Method 1
regenerative braking systems, which convert the energy from braking into electricity that can be used to recharge the battery
Data Source
AI summary
Systems and methods for activating a regenerative braking profile of a first vehicle are provided. A plurality of driving signals are received from the first vehicle. The driving signals are associated with a first driver of the first vehicle. It is detected that the first driver is attempting to maintain a steady vehicle speed based on the driving signals from the first vehicle, and in response to the detection of the first driver attempting to maintain a steady vehicle speed, a first regenerative braking profile based on the plurality of driving signals is activated.