Braking Assistant Reactivation via Hydraulic Pressure Decay Monitoring
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Solution Overview
Problem
Existing vehicle braking systems face issues with unintentional reactivation of the braking assistant due to pressure oscillations after a braking force monitoring function is terminated, leading to false triggering and loss of driver control.
Innovation Solution
The method involves shifting the braking assistant function into a non-activatable state after a braking force monitoring function is terminated and monitoring hydraulic pressure at a predefined point in the braking circuit, re-enabling it only when predefined conditions of pressure decay are met, such as a change in pressure falling below a limit value over successive time intervals, thereby preventing false activations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the braking assistant function is immediately re-enabled after termination of a braking force monitoring function, then the system responds quickly to new braking events, but pressure oscillations cause false reactivation and loss of driver control
Solution Approach 1:
The system performs preliminary detection of pressure oscillations after braking force monitoring termination. Before re-enabling the braking assistant, the system checks whether pressure oscillations have subsided by evaluating pressure change rates over multiple determination times. This preliminary action prevents false reactivation while maintaining quick response to legitimate braking events.
2Reliability
If the braking assistant is kept in non-activatable state for extended period after braking force monitoring, then false reactivation is prevented, but system responsiveness to legitimate braking events is delayed
Solution Approach 1:
The system continuously monitors hydraulic pressure and calculates pressure change rates between determination times. This feedback mechanism dynamically determines when to re-enable the braking assistant based on actual pressure conditions. When the pressure change rate falls below a threshold for multiple consecutive determination times, the system re-enables the braking assistant, optimizing the balance between preventing false activation and maintaining responsiveness.
3Measurement precision
If hydraulic pressure is monitored at frequent determination times, then pressure oscillations are detected accurately, but system complexity and computational load increase
Solution Approach 1:
The system employs periodic determination times for hydraulic pressure monitoring rather than continuous monitoring. Pressure values are determined at discrete, regularly spaced determination times, and oscillation detection is performed by comparing pressure change rates across these periodic samples. This approach achieves sufficient detection accuracy while reducing computational load and system complexity compared to continuous monitoring.
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 solution effectively prevents the braking assistant from being reactivated by pressure fluctuations, ensuring accurate driver-initiated braking and maintaining system reliability by ensuring the decay of oscillations, thus enhancing safety and control.
Implementation Method 1
information about the hydraulic pressure at a predefined point in the hydraulic braking circuit is determined
Data Source
AI summary
A method for shifting the braking assistant function into an activatable state, in which method:after termination of a braking force monitoring function, the braking assistant function is shifted into a non-activatable state or a non-activatable state is maintained;information about the hydraulic pressure at a predefined point in the hydraulic braking circuit is determined; andafter at least one predefined condition is met by that information, the braking assistant function is shifted into an activatable state.