Vehicle Brake Pressure Redistribution for Slip-Controlled Deceleration
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Solution Overview
Problem
Existing vehicle braking systems, such as ABS and RSC, face challenges in ensuring reliable vehicle deceleration during cornering, as brake slip-controlled wheels contribute less to the braking effect, potentially leading to instability and increased risk of overturning.
Innovation Solution
The method involves detecting brake slip at individual wheels and adjusting brake pressures at non-brake slip-controlled wheels to compensate for the reduced braking effect, ensuring the total brake pressure or braking torque remains equivalent to that without active brake slip control, thereby maintaining setpoint vehicle deceleration and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake slip control is applied to prevent wheel lockup, then wheel lockup is prevented, but the braking effect is reduced
Solution Approach 1:
The patent applies local quality by differentiating the brake pressure control strategy for individual wheels based on their slip conditions. Wheels experiencing brake slip receive reduced brake pressure to prevent lockup, while other wheels maintain or increase brake pressure to compensate for the reduced braking effect, creating a non-uniform but optimized brake pressure distribution across the vehicle's wheels
Solution Approach 2:
The patent dynamically changes the brake pressure parameter in response to detected wheel slip conditions. When brake slip is detected at a wheel, the system reduces brake pressure at that specific wheel while simultaneously increasing brake pressure at other wheels, thereby adjusting the overall braking force distribution to maintain both slip prevention and adequate braking effect
2Reliability
If brake pressure is reduced at one wheel to prevent slip, then wheel slip is prevented, but vehicle deceleration is reduced
Solution Approach 1:
The patent merges the control of multiple wheels into a coordinated system where the reduction in braking effect from one wheel is compensated by increased braking at other wheels. This combined approach ensures that the total vehicle deceleration remains sufficient while individual wheels are protected from slip, effectively merging individual wheel control actions into a unified vehicle-level braking strategy
3Speed
If additional braking is applied to compensate for reduced braking effect, then vehicle deceleration is maintained, but stability is lost during cornering
Solution Approach 1:
The patent applies local quality by strategically applying additional brake pressure only at wheels that are not experiencing slip, rather than uniformly increasing pressure at all wheels. This localized compensation approach maintains vehicle deceleration while avoiding the stability issues that would arise from symmetric brake pressure increases during cornering maneuvers
Solution Approach 2:
The patent implements a dynamic brake pressure control strategy that continuously monitors wheel slip conditions and adjusts brake pressure distribution in real-time. The system dynamically determines which wheels need pressure reduction (to prevent slip) and which wheels need pressure increase (to maintain deceleration), adapting the braking strategy to the current driving conditions and vehicle state
Data Source
AI summary
A method for electronically controlling a vehicle deceleration of a brake slip-controlled vehicle comprising a pneumatic braking system includes detecting that at least one wheel of the vehicle has a brake slip that exceeds a setpoint brake slip; in response to detecting that at least one of the wheels of the vehicle has a brake slip that exceeds the setpoint brake slip, brake slip-controlling the at least one wheel in order to prevent a lockup of the at least one wheel; determining a braking effect caused by wheel brakes on the wheels of the vehicle; and adjusting brake pressures output at the wheel brakes of one or more non-brake slip-controlled wheels in order to adjust the induced braking effect. The brake pressures at the wheel brakes of all non-brake slip-controlled wheels are adjusted.