Regenerative Braking Control Device Blending Torque
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Solution Overview
Problem
Conventional regenerative braking systems in vehicles have limited deceleration potential and efficiency, leading to suboptimal energy recuperation and increased fuel consumption, with changes in deceleration behavior being perceivable to the driver during high braking torque requests.
Innovation Solution
A control device that introduces a non-compensated or blended regenerative deceleration component, utilizing the electric motor to enhance deceleration potential and efficiency by adding a minimal additional braking torque only when the setpoint overall braking torque exceeds a limit, ensuring imperceptible changes to the driver and optimizing battery charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the setpoint overall braking torque is increased to improve deceleration performance, then the deceleration capability is improved, but the regenerative braking efficiency deteriorates because the electric motor cannot provide sufficient braking torque
Solution Approach 1:
The patent combines friction braking and regenerative braking into a unified braking system that operates simultaneously. The control device coordinates both braking mechanisms to work together, allowing the friction brake to supplement the electric motor's limited regenerative braking torque, thereby improving overall deceleration capability while maintaining high regenerative braking efficiency through optimized torque distribution.
Solution Approach 2:
The control device dynamically adjusts the distribution of braking torque between the electric motor and friction brake based on real-time operating parameters such as vehicle speed, battery charge state, and driver braking intention. By changing the torque distribution parameters adaptively, the system maximizes regenerative braking efficiency when conditions permit while ensuring sufficient deceleration performance is maintained at all times.
2Speed
If friction braking is used to compensate for limited regenerative braking torque, then deceleration performance is maintained, but regenerative braking efficiency deteriorates due to energy loss
Solution Approach 1:
The control device implements continuous feedback monitoring of the battery's charge state, vehicle speed, and braking torque requirements. Based on this feedback, the system dynamically determines the optimal mix of regenerative and friction braking. When the battery can accept charge, the system prioritizes regenerative braking; when the battery is full or charging capacity is limited, the system transitions to friction braking, thereby minimizing energy loss while maintaining deceleration performance.
Solution Approach 2:
The braking system transitions dynamically between different braking modes based on real-time conditions. The control device continuously adjusts the braking torque distribution from predominantly regenerative braking to predominantly friction braking as battery charge state and vehicle operating conditions change, optimizing the balance between deceleration performance and energy recovery efficiency throughout the braking event.
3Loss of energy
If regenerative braking torque is increased to improve energy recuperation, then fuel consumption is reduced, but deceleration behavior becomes perceptible to the driver
Solution Approach 1:
The friction brake acts as an intermediary that smooths out the deceleration characteristics of pure regenerative braking. By blending friction braking with regenerative braking, the system achieves a more natural and comfortable braking sensation for the driver while maintaining high energy recuperation efficiency. The friction brake compensates for the abrupt or excessive deceleration that would otherwise be perceptible to the driver.
Solution Approach 2:
The control device adjusts the regenerative braking torque parameter dynamically based on driver braking intention and vehicle operating conditions. When driver braking input is detected, the system modulates the regenerative braking torque to provide a comfortable transition, preventing sudden or excessive deceleration forces that would be perceptible to the driver, while still maximizing energy recovery within comfortable limits.
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 improves regenerative braking efficiency, reduces fuel consumption, and minimizes pollutant emissions while maintaining comfortable braking sensations for the driver, allowing for more rapid battery charging without noticeable deceleration changes.
Implementation Method 1
the at least one electric motor (14) of the braking system, which can be used in generator mode
Data Source
AI summary
A control device for a vehicle regenerative braking system, having an engine control device, with which a setpoint engine braking torque variable for a setpoint engine braking torque to be imparted by an electric motor, useable in generator mode, is defineable, considering a setpoint overall braking torque variable for a predefined setpoint overall braking torque, and considering an actual friction braking torque variable for an imparted/impartable actual friction braking torque of at least one additional friction brake, wherein if the setpoint variable is below a threshold, the setpoint variable is defineable according to a difference between the setpoint overall braking torque to be imparted and the imparted/impartable braking torque, and if the setpoint variable is above the threshold, the setpoint variable is defineable according to a sum of a predefined additional braking torque and the difference. Also described are a regenerative braking system and method.