Pre-pressurized Brake System for Critical Vehicle Stabilization
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Solution Overview
Problem
Existing driving dynamics regulation systems face delays in brake pressure buildup during highly dynamic maneuvers, leading to insufficient stabilization and potential vehicle overturns, especially in vehicles with high centers of gravity, due to the finite gradient of brake pressure ramp-up and fluid filling delays.
Innovation Solution
The system detects imminent critical driving situations by monitoring yaw velocity, lateral acceleration, and steering speed, and applies a preparatory brake pressure to wheels expected to require intervention, pre-loading the brake system to reduce response time and enhance stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake system is activated during critical driving situations, then the vehicle stabilization is achieved, but the response time is delayed due to finite brake pressure buildup gradient and fluid filling delays
Solution Approach 1:
The control unit activates selected wheel brakes in advance during the first steering maneuver to build up preparatory brake pressure before the critical second steering maneuver occurs. This preliminary action ensures that when the critical situation arises, the brakes are already pressurized and can respond immediately, eliminating the delay caused by finite brake pressure buildup gradient and fluid filling delays.
2Speed
If high brake pressure is applied immediately during critical maneuvers, then stabilization is achieved quickly, but vehicle control may be compromised during the first steering maneuver
Solution Approach 1:
The system applies preparatory brake pressure at selected wheels during the first steering maneuver at a level that does not compromise vehicle controllability. This preliminary action builds up brake pressure in advance so that when the critical second steering maneuver occurs, the full stabilization braking torque can be applied immediately without delay, achieving both quick stabilization and maintained controllability during the initial maneuver.
Data Source
AI summary
A method for improving the efficiency of a driving dynamics regulating system which intervenes in the driving operation in critical driving situations by automatic braking intervention at selected wheels. It is possible for the reaction speed of the brake system 3 to be considerably increased if, before the actual regulating intervention, the imminent critical driving situation is already detected and a slight preparatory brake pressure is already built up at least one wheel at which a future regulating intervention is expected.