Brake-By-Wire Deceleration Feedback Control for Brake Fading
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Solution Overview
Problem
In motor vehicles with 'Brake-By-Wire' systems, the set braking value may not result in the expected deceleration, leading to driver confidence issues, especially during brake fading situations.
Innovation Solution
A method that measures vehicle deceleration and brake pedal position to determine an actual ratio, compares it to a target ratio, and adjusts braking when deviations occur, ensuring appropriate deceleration based on pedal position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fixed braking value is set based on brake pedal position in Brake-By-Wire systems, then the braking control is simple and responsive, but the braking performance becomes inconsistent during brake fading situations
Solution Approach 1:
The patent implements a feedback mechanism by continuously measuring actual vehicle deceleration during braking and comparing it to expected deceleration values. When brake fading is detected (actual deceleration falls below a threshold), the system automatically adjusts the braking value to compensate, ensuring consistent braking performance while maintaining rapid response through the electronic control architecture
Solution Approach 2:
The patent transforms the static braking value approach into a dynamic system that automatically adapts to changing brake conditions. The braking value is no longer fixed but is continuously adjusted based on real-time deceleration measurements, allowing the system to maintain optimal performance across varying thermal and operational states
2Device complexity
If brake fading occurs and the set braking value does not achieve expected deceleration, then the braking system structure remains simple, but driver confidence is lost
Solution Approach 1:
The patent enables the braking system to self-diagnose and self-correct during operation. By continuously monitoring actual deceleration and automatically adjusting braking values when fading is detected, the system maintains reliable performance without requiring complex additional hardware or manual intervention, thereby preserving driver confidence
Data Source
AI summary
A motor vehicle braking method wherein the vehicle includes a brake operating unit generating a braking signal based on brake pedal travel. The method includes the step of measuring the vehicle deceleration and pedal position during vehicle braking and determining an actual ratio between the measured deceleration and pedal position. In addition, a target ratio is provided based on vehicle deceleration for a defined pedal position. Wherein the actual ratios compared with the target ratio and a braking adjustment is provided when the actual ratio deviates from the target ratio.