Brake Force Redistribution for Downhill Understeer on Loose Slopes
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Solution Overview
Problem
Driving downhill on slopes with deformable surfaces like sand or dirt can lead to understeer conditions due to the influence on steering and braking responses, as the front wheels tend to 'wash out' due to the normal brake force distribution favoring the front axle, which is not effectively managed by existing technologies.
Innovation Solution
A vehicle control system with a sensor network and controller that detects downhill travel and understeer conditions, dynamically adjusting brake force distribution between the front and rear axles by modifying the brake force distribution from a nominal 70/30 split to a more rearward biased distribution, such as 20/80 or 30/70, to counteract understeer through a brake optimizer module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If normal brake force distribution (70/30 front/rear) is used during downhill braking, then braking efficiency is maintained, but understeer condition occurs due to front wheel washout
Solution Approach 1:
The brake force distribution is dynamically adjusted based on vehicle operating conditions (downhill slope detection). The system transitions from a static 70/30 front/rear distribution to a modified distribution with reduced front brake force, allowing the brake system to adapt to changing terrain and prevent understeer while maintaining braking effectiveness
Solution Approach 2:
The system changes the brake force distribution parameter from the nominal 70/30 split to a modified distribution (e.g., reducing front brake force to 20-40%). This parameter modification is triggered by detection of downhill conditions and understeer, directly addressing the technical contradiction by altering the force distribution to prevent front wheel washout while preserving overall braking capability
2Ease of operation
If brake force distribution is shifted rearward to counteract understeer, then steering response improves, but braking efficiency may be reduced
Solution Approach 1:
The system dynamically adjusts brake force distribution only when specific conditions are met (downhill slope detection combined with understeer detection). When conditions return to normal, the system reverts to the nominal 70/30 distribution, ensuring braking efficiency is maintained during normal operation while steering response is improved only when necessary
Solution Approach 2:
The system applies partial brake force reduction at the front axle rather than complete elimination. By reducing front brake force to a moderate level (20-40% of total brake force) rather than zero, the system achieves sufficient steering improvement while retaining enough front brake capability to maintain overall braking efficiency
Data Source
AI summary
A method of adaptively changing brake force distribution in a vehicle may include detecting vehicle parameters during operation of the vehicle, based on the detected vehicle parameters, determining downhill travel of the vehicle while braking and steering inputs are applied to the vehicle as an enabling condition, and responsive to detection of a trigger comprising detection of an understeer condition while the enabling condition is satisfied, executing a brake force distribution modification defining a change in distribution of brake forces between a front axle and a rear axle of the vehicle.