Closed-loop Regenerative Braking Torque Control
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Solution Overview
Problem
Conventional regenerative braking systems apply regenerative braking in an open-loop fashion, failing to account for variables such as vehicle mass, leading to inconsistent performance and missed opportunities for kinetic energy recapture, especially when the vehicle is heavily loaded.
Innovation Solution
A closed-loop control system that adjusts regenerative braking torque based on real-time vehicle deceleration measurements to maintain a target deceleration, using a vehicle controller to apply a first amount of torque, determine current deceleration, calculate differences, and adjust the torque accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If open-loop regenerative braking control is used with fixed torque based on accelerator pedal position, then the system is simple to implement, but the regenerative braking performance is inconsistent and causes occupant discomfort
Solution Approach 1:
The patent implements closed-loop control by continuously measuring actual vehicle deceleration and comparing it to target deceleration, then adjusting regenerative braking torque accordingly. This feedback mechanism ensures consistent braking performance across varying vehicle loads while maintaining occupant comfort.
Solution Approach 2:
The system dynamically adjusts regenerative braking torque based on real-time vehicle conditions rather than using fixed predetermined values. The controller modifies torque application according to actual deceleration feedback, enabling adaptive performance that responds to changing vehicle mass and loading conditions.
2Device complexity
If open-loop regenerative braking control is used without accounting for vehicle mass, then the control scheme is simple, but additional kinetic energy cannot be recaptured when the vehicle is heavily loaded
Solution Approach 1:
By implementing closed-loop control that continuously monitors actual vehicle deceleration and compares it to target deceleration, the system automatically adapts to varying vehicle mass. This enables the system to recapture additional kinetic energy when the vehicle is heavily loaded without requiring direct measurement of vehicle mass or complex predictive algorithms.
Solution Approach 2:
The system uses the vehicle's own deceleration response as feedback to automatically adjust torque application. This self-regulating mechanism eliminates the need for external mass sensing or complex calculations, allowing the control system to adapt to loading conditions using only deceleration measurements from the vehicle's existing sensors.
3Ease of operation
If conventional regenerative braking systems do not account for variables affecting vehicle deceleration behavior, then the system is easier to operate, but inconsistent regenerative braking performance results
Solution Approach 1:
The closed-loop control system automatically compensates for varying vehicle load conditions by continuously measuring actual deceleration and adjusting torque accordingly. This eliminates the need for manual intervention or complex operator decisions while ensuring consistent braking performance across all operating conditions.
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 ensures consistent vehicle deceleration behavior and maximizes kinetic energy recapture by dynamically adjusting regenerative braking torque, regardless of vehicle load, enhancing occupant comfort and energy recovery.
Implementation Method 1
Regenerative braking systems enable recapturing of a portion of the kinetic energy of a vehicle's momentum by converting the kinetic energy to electrical energy that is used to power the vehicle
Implementation Method 2
a regenerative braking subsystem and a vehicle controller. The vehicle controller is configured to command the regenerative braking subsystem to apply a first amount of regenerative braking torque
Data Source
AI summary
Systems, methods, and vehicles for closed-loop control of regenerative braking. The system includes, in one implementation, a regenerative braking subsystem and a vehicle controller. The vehicle controller is configured to command the regenerative braking subsystem to apply a first amount of regenerative braking torque. The vehicle controller is also configured to determine a current vehicle deceleration while the first amount of regenerative braking torque is applied. The vehicle controller is further configured to determine a difference between the current vehicle deceleration and a target vehicle deceleration. The vehicle controller is also configured to set a second amount of regenerative braking torque to reduce the difference between the current vehicle deceleration and the target vehicle deceleration. The vehicle controller is further configured to command the regenerative braking subsystem to apply the second amount of regenerative braking torque.