Hydraulic Brake Pressure Modulation for Vehicle Stability
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Solution Overview
Problem
Hydraulic brake systems in motor vehicles face challenges in maintaining stability during braking procedures, particularly in preventing unwanted sideward swerve or skewed positions relative to the vehicle's motion, especially when detecting deviations from a desired track.
Innovation Solution
A method for actuating the hydraulic brake system that adjusts wheel-specific brake pressure based on data from sensors monitoring longitudinal and transverse dynamics, as well as a driving environment sensor system, to maintain stability by modulating pressure through intake and discharge valves, allowing for both reduction and increase in brake pressure as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wheel-specific brake pressure is adjusted using only brake pressure reduction, then the brake system can prevent unwanted sideward swerve, but the system cannot increase brake pressure when necessary for optimal stability control
Solution Approach 1:
The hydraulic brake system is designed to perform multiple functions: pressure reduction through discharge valves and pressure increase through the hydraulic pump. This multi-functional capability allows the system to adapt to different stability control scenarios, whether pressure needs to be reduced to prevent lockup or increased to enhance braking effectiveness for track maintenance.
Solution Approach 2:
The patent utilizes hydraulic principles to transmit and modulate brake pressure throughout the system. The hydraulic pump generates pressure increases, while discharge valves control pressure reduction, enabling precise wheel-specific pressure adjustment that maintains vehicle stability during braking maneuvers.
2Reliability
If driving environment sensor system data are integrated into brake control, then the system can detect lateral distance from desired track and improve stability, but the system complexity and computational requirements increase
Solution Approach 1:
The brake control system merges data from multiple sources including wheel-speed sensors, acceleration sensors, steering-angle sensors, and driving environment sensors into a unified control algorithm. This integration allows the system to comprehensively assess vehicle state and track position, enabling more accurate stability control decisions despite the increased complexity of coordinating multiple sensor inputs.
Solution Approach 2:
The system continuously monitors vehicle position relative to the desired track using driving environment sensors and feeds this information back to the brake control unit. This feedback loop enables real-time adjustments to brake pressure based on actual track deviation, improving stability while systematically managing the complexity through structured control algorithms.
3Reliability
If brake pressure is increased using hydraulic pump, then optimal brake pressure can be achieved for track maintenance, but energy consumption and system complexity increase
Solution Approach 1:
The hydraulic pump is activated only when and where specifically needed to increase brake pressure at individual wheels, rather than applying pressure increases system-wide. This partial action approach minimizes energy consumption by limiting pump operation to only those instances and locations where track maintenance requires additional braking force.
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 effectively prevents or reduces deviations from the desired track during braking, enhancing driving stability by utilizing sensor data to adjust brake pressure dynamically, ensuring the vehicle follows the desired path without increasing brake pressure unnecessarily.
Implementation Method 1
with the aid of a hydraulic pump, the wheel-brake pressure may also be modulated in a way that a brake-pressure increase may be realized
Implementation Method 2
the brake pressure in the brake units of the vehicle wheels may be modulated in a manner that without increase of brake pressure, the wheel-brake pressure is merely lowered individually
Data Source
AI summary
A method for actuating a hydraulic brake system in a motor vehicle, in which a hydraulic brake pressure is generated specific to the wheel, data of a driving environment sensor system being taken into account for detecting the instantaneous lateral distance of the motor vehicle from the desired track.