Braking System Pressure-Volume Characteristic Adaptation
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Solution Overview
Problem
Existing methods for ascertaining the pressure-volume characteristic of vehicle braking systems are inadequate in detecting and adapting to factors like cornering, which affect the braking system's functionality and comfort, leading to deviations from desired performance.
Innovation Solution
A method that determines and adapts the pressure-volume characteristic of a vehicle's braking system during operation by calculating adapted volume or pressure differences, allowing for real-time adjustments to maintain desired functionality and comfort, particularly by executing specific method steps for predefined pressures or after cornering operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pressure-volume characteristic is ascertained using conventional methods with pressure and volume sensors, then the basic braking system performance can be monitored, but the system cannot detect and adapt to dynamic influencing factors such as cornering, temperature, and wear in real-time
Solution Approach 1:
The system pre-stores multiple pressure-volume characteristic curves representing different braking system states (new brakes, worn brakes, temperature variations, cornering conditions). During operation, the controller selects and applies the appropriate pre-stored curve based on detected operating conditions, enabling proactive adaptation without real-time measurement of all parameters
Solution Approach 2:
The system continuously compares actual pressure-volume measurements against the selected reference curve and detects deviations. When deviations exceed threshold values indicating specific conditions (e.g., cornering, wear), the system feedback-adjusts the selected characteristic curve to match the current state, enabling dynamic adaptation to maintaining reliable braking performance
2Measurement precision
If correction factors are calculated by comparing current pressure-volume curves with initial characteristics, then influencing factors can be identified, but the system cannot react in real-time during ongoing braking operations
Solution Approach 1:
Multiple pressure-volume characteristic curves for different braking system states are pre-calculated and stored in memory before operation. This eliminates the need for real-time calculation of correction factors, allowing immediate selection of the appropriate reference curve during braking operations without time loss
Solution Approach 2:
The system dynamically switches between different pre-stored pressure-volume characteristic curves based on detected operating conditions. The controller can change the reference curve mid-operation in response to detected deviations, enabling real-time adaptation without the computational delay of calculating new correction factors during braking
3Reliability
If the system continuously monitors and adapts to pressure-volume characteristic deviations, then braking comfort and functionality are maintained, but the complexity of the control system increases
Solution Approach 1:
The system extracts and separates the complex pressure-volume characteristic analysis into pre-calculated reference curves stored in memory. The controller only needs to perform simple comparison operations between actual measurements and selected reference curves, rather than performing complex real-time calculations, thereby reducing control system complexity while maintaining monitoring capabilities
Solution Approach 2:
The system monitors changes in key parameters (pressure, volume, temperature, acceleration) and adjusts the selected pressure-volume characteristic curve accordingly. By focusing monitoring on critical parameter changes rather than continuous full-system analysis, the system maintains reliable braking functionality with reduced computational complexity
Data Source
AI summary
A method for ascertaining a pressure-volume characteristic of a vehicle braking system includes determining at least a first pressure-volume value pair of a first pressure occurring in the braking system during a pressure rise and of a first volume displaced in order to produce the first pressure, deriving a second pressure-volume value pair for a second pressure higher than the first pressure or for a second volume greater than the first volume in consideration at least of the first pressure-volume value pair and an indication in a predefined characteristic curve of a volume difference between a first volume associated with the first pressure and a second volume associated with the second pressure, or of a pressure difference between a first pressure associated with the first volume and a second pressure associated with the second volume.