Brake Fluid State Detection via Flow and Pressure Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing brake system technologies face challenges in accurately and reliably determining variables such as viscosity, temperature, water content, aging state, and composition of brake fluid, which affect the flow properties and dynamic performance of the brake system, often requiring additional sensors and leading to inaccuracies.
Innovation Solution
A method and device that utilize an evaluation unit to determine these variables by analyzing volume flow and pressure drop variables within specific range limits, eliminating the need for additional sensors like temperature sensors, and using coefficients k1 and k2 to accurately assess the brake fluid's state without excessive piston displacement, thereby optimizing brake system control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors (e.g., temperature sensors) are used to determine brake fluid properties, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The evaluation unit performs multiple functions: it determines volume flow variables from piston displacement data, determines pressure drop variables from pressure sensor data, and uses these combined variables to ascertain brake fluid properties (viscosity, temperature, water content, aging state). This multi-functional approach eliminates the need for separate temperature sensors and other additional sensing devices.
2Productivity
If piston displacement speed is increased to improve response time, then productivity is improved, but measurement precision deteriorates due to inaccuracy from excessive displacement speed
Solution Approach 1:
The system dynamically adapts the evaluation process to the current piston displacement speed. The evaluation unit continuously monitors displacement speed and adjusts the determination of volume flow variables accordingly, ensuring accurate measurements are performed only when displacement speed is within acceptable ranges, while maintaining system responsiveness.
Solution Approach 2:
The evaluation unit uses feedback from the piston displacement speed to control the measurement process. When displacement speed exceeds the maximum threshold, the system recognizes this condition and adjusts its evaluation strategy, using the feedback information to maintain measurement accuracy while preserving system productivity.
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 allows for precise and reliable determination of brake fluid properties, enabling continuous updates and improved brake system performance by adapting control signals to changing fluid conditions, thus enhancing the brake system's dynamic performance and reducing errors.
Implementation Method 1
a pressure drop variable regarding a pressure drop occurring at the flow resistance through which volume flow Q flows
Implementation Method 2
a first variable regarding a volume flow Q of at least a portion of the brake fluid that is pressed through a flow resistance situated in the brake system
Data Source
AI summary
For ascertaining at least one variable regarding a state of a brake fluid in a brake system of a vehicle, an evaluation unit is configured to determine the at least one variable by taking into account at least one pair of values of a provided or ascertained volume flow variable regarding a volume flow of at least a portion of the brake fluid through a flow resistance in the brake system and a provided or ascertained associated pressure drop variable regarding a pressure drop at the flow resistance through which the volume flow flows. For the at least one pair of values taken into account, a volume flow variable lies within a first specified limited value range and the pressure drop variable lies within a second specified limited value range.