Regenerative Braking Error Control for Fuel Efficiency
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Solution Overview
Problem
Existing vehicle brake systems that use both regenerative and frictional braking face limitations in regenerative braking, leading to reduced fuel efficiency due to unnecessary disengagement of regenerative braking, which can occur even in situations where it is not required, thereby compromising the effectiveness of the system.
Innovation Solution
A method and system that determine the deceleration error by comparing actual and requested deceleration, and dynamically adjust regenerative braking based on an error threshold, allowing frictional braking to take over only when necessary, thereby maximizing regenerative braking contributions while ensuring safety against potential failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a limit or threshold is placed on the regenerative component to guard against potential failures, then safety is improved, but the role of the regenerative braking system is limited and fuel efficiency is reduced
Solution Approach 1:
The patent applies dynamics by transitioning from a static, fixed threshold approach to a dynamic, adaptive control system. The regenerative braking contribution is continuously adjusted based on real-time monitoring of deceleration error between actual and requested values. This allows the system to dynamically optimize the regenerative braking role while maintaining safety, resolving the contradiction between reliability and fuel efficiency.
Solution Approach 2:
The patent implements feedback control by continuously comparing actual deceleration with requested deceleration and using the deceleration error to adjust regenerative braking levels. This closed-loop feedback mechanism enables the system to maintain safety through real-time monitoring while maximizing fuel efficiency by allowing regenerative braking to operate at optimal levels without unnecessary limitations.
2Reliability
If regenerative braking is limited to a threshold level, then potential failures are guarded against, but the overall effectiveness of the braking system is reduced
Solution Approach 1:
The patent uses feedback control to continuously monitor the deceleration error and adjust regenerative braking levels accordingly. This allows the system to maintain failure protection through real-time monitoring while maximizing braking system effectiveness by allowing regenerative braking to contribute at optimal levels rather than being constrained by fixed thresholds.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the regenerative braking contribution level based on the deceleration error parameter. Instead of using a fixed threshold parameter, the system continuously modifies the regenerative braking parameter in response to changing operating conditions, thereby maintaining both safety and effectiveness.
3Use of energy by moving object
If the regenerative braking system operates without limitations, then fuel efficiency is maximized, but the system cannot quickly intercede in the event of failure
Solution Approach 1:
The patent implements feedback control that continuously monitors the deceleration error and adjusts regenerative braking levels in real-time. This allows the system to maximize fuel efficiency by operating without arbitrary fixed limitations while simultaneously maintaining failure response capability through continuous monitoring and dynamic adjustment based on actual performance.
Solution Approach 2:
The patent applies dynamics by transitioning from static, predetermined limitations to dynamic, real-time control. The regenerative braking system operates flexibly without fixed thresholds, allowing maximum fuel efficiency, while the dynamic monitoring and adjustment capability ensures the system can quickly respond to failures by detecting deceleration errors and modifying operation as needed.
Data Source
AI summary
A vehicle brake system and method designed to maximize the contributions from a regenerative braking system, yet still provide adequate safety measures that address potential regenerative braking failure. According to one embodiment, the method determines both a requested deceleration from the driver and an actual deceleration experienced by the vehicle, and uses the difference between these two values to calculate a deceleration error that can be integrated over time and compared to an error threshold. If the integrated or accumulated deceleration error surpasses the error threshold, then the method may reduce or disable the regenerative braking system until it can confirm that it is operating properly.