Adaptive Brake Force Control for Energy Recovery
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Solution Overview
Problem
Existing brake systems for motor vehicles do not maximize electrical energy recovery during generator-based deceleration and fail to optimize the combination of hydraulic and regenerative braking, leading to inefficient energy use and increased brake wear.
Innovation Solution
A method and apparatus that detect the degree of brake pedal actuation and characteristics of the brake system to calculate hydraulic and generator-based brake force characteristic curves, allowing for adaptive control of both brake units to optimize energy recovery and minimize plateau regions in the brake pedal characteristic curve, thereby enhancing energy efficiency and reducing driver effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking is used to maximize electrical energy recovery, then energy efficiency is improved, but brake wear increases due to increased reliance on friction brakes
Solution Approach 1:
The control method dynamically adjusts the distribution between regenerative and friction braking based on real-time brake pedal actuation detection and characteristic curve calculations. The system transitions from static braking strategies to dynamic adaptation, optimizing the mix of electrical and mechanical braking forces to maximize energy recovery while minimizing wear.
Solution Approach 2:
The system changes operational parameters by calculating hydraulic brake force characteristic curves and selecting generator-based brake force characteristic curves from characteristic maps based on detected brake system characteristics. This parameter adaptation allows optimal energy recovery while controlling friction brake engagement to reduce wear.
2Reliability
If hydraulic and regenerative braking are combined without optimization, then braking capability is maintained, but energy efficiency decreases due to suboptimal energy recovery
Solution Approach 1:
The control method implements feedback by detecting brake pedal actuation degree and brake system characteristics, then using this information to calculate optimal brake force characteristic curves. The system continuously monitors and adjusts the braking strategy based on actual system state, ensuring both reliable braking capability and optimal energy efficiency.
Solution Approach 2:
The system performs preliminary calculations of hydraulic brake force characteristic curves and pre-selects generator-based brake force characteristic curves from characteristic maps before actual braking occurs. This advance preparation ensures optimal energy efficiency is achieved from the start of braking while maintaining required braking capability.
3Device complexity
If the brake system uses fixed characteristic curves, then control simplicity is maintained, but adaptability to component tolerances and changing conditions deteriorates
Solution Approach 1:
The system transitions from fixed characteristic curves to dynamic, adaptive characteristic curves that are calculated based on detected brake system characteristics. This allows the control system to adapt to component tolerances and changing conditions while maintaining a relatively simple control architecture through automated curve selection from pre-defined maps.
Solution Approach 2:
The control method changes the parameter of brake force characteristic curves based on detected brake system characteristics. By selecting from multiple pre-calculated curves in characteristic maps or dynamically adjusting curve parameters, the system achieves adaptability to component tolerances without significantly increasing control complexity.
4Use of energy by moving object
If regenerative braking is applied without optimization, then electrical energy is recovered, but plateau regions in the brake pedal characteristic curve increase requiring increased driver effort
Solution Approach 1:
The system optimizes the generator-based brake force characteristic curve parameters to minimize plateau regions in the brake pedal characteristic curve. By adjusting the slope and shape parameters of the regenerative braking curve based on detected hydraulic brake characteristics, the system maintains smooth pedal response and reduces driver effort while maximizing electrical energy recovery.
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 electrical energy recovery during generator-based deceleration, optimizes the brake system for component tolerances, and reduces brake idle travel, allowing for efficient energy use and minimal wear, with the system adapting to changing braking behaviors and conditions.
Implementation Method 1
A method and apparatus for controlling a brake system for a motor vehicle having a brake device with a hydraulic brake unit and a recuperation brake unit... generator-based brake force characteristic curve... maximizes electrical energy recovery during generator-based deceleration
Data Source
AI summary
A method is provided for controlling a brake system of a motor vehicle having a brake device (40) with a hydraulic brake unit (41) and a recuperation brake unit (42). The method includes calculating (S1) a hydraulic brake force characteristic curve (B2) of the hydraulic brake unit (41) on the basis of at least one detected characteristic of the brake system, selecting (S2) a generator-based brake force characteristic curve (G1-G4) of the recuperation brake unit (42) on the basis of a predefined criterion and as a function of the calculated hydraulic brake force characteristic curve (B2), and controlling (S3) the hydraulic brake unit (41) and the recuperation brake unit (42) in accordance with a detected degree of actuation of the brake pedal (10), the calculated hydraulic brake force characteristic curves (B2), and the selected generator-based brake force characteristic curve (G1-G4).