Brake Control for Counter-Steering Rollover Prevention
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Solution Overview
Problem
Existing brake systems in multiple-track motor vehicles struggle to effectively prevent rollover situations during counter-steering maneuvers, as they typically only activate brakes on the wheel with the greatest load, leading to delayed brake initiation and reduced vehicle stability.
Innovation Solution
A method for operating a brake system that involves automatic braking of the more heavily loaded wheel during cornering, followed by detection of counter-steering movements. The system then builds up brake force at the less loaded opposite wheel, proactively initiating the brake effect before the wheel becomes more heavily loaded, thereby enhancing vehicle stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake system only activates brakes on the wheel with the greatest load during cornering, then the brake system operates in a simple and predictable manner, but the brake initiation is delayed and vehicle stability is reduced during counter-steering maneuvers
Solution Approach 1:
The control system detects counter-steering movements and proactively builds up brake force at the less loaded wheel before it becomes the more heavily loaded wheel. This preliminary action ensures that when the wheel load transfers, the brake force is already present, eliminating delay and improving vehicle stability during dynamic maneuvers.
Solution Approach 2:
The system applies a counteracting brake force to the less loaded wheel in anticipation of load transfer during counter-steering. This preliminary anti-action counterbalances the impending load shift and prevents rollover situations by stabilizing the vehicle before the critical moment occurs.
2Force
If the brake force build-up starts only when the wheel becomes more heavily loaded, then the control logic is simple, but the maximum brake force that can be generated is limited by the brake system capacity
Solution Approach 1:
The control system initiates brake force build-up at the less loaded wheel before load transfer occurs, utilizing the available time and brake system capacity to generate higher maximum brake forces. This preliminary action allows the brake system to reach its full potential output rather than starting from zero when the wheel becomes loaded.
Solution Approach 2:
The control system dynamically adjusts brake force application based on real-time detection of counter-steering movements and wheel load conditions. By making the brake control adaptive and dynamic rather than static, the system can optimize brake force build-up timing and magnitude to maximize vehicle stability.
Data Source
AI summary
In the case of a method for operating a brake system of an at least double-tracked motor vehicle (10) which comprises 2 breakable wheels (12L, 12R), which are arranged at opposite ends of an axle (14V), and a rollover protection system, which can cause braking of the wheels (12L, 12R) in order to prevent a rollover situation, automatic braking of that wheel of the axle (14V), which is loaded more greatly when cornering is brought about by way of the rollover protection system. Subsequently, a counter-steering movement is detected by way of a predefined steering angle change being exceeded in a predefined time period in the direction counter to the cornering direction, and, thereupon, a brake force is caused to be built up at the opposite wheel, which is loaded less greatly by way of the rollover protection system.