Towing Vehicle Brake Control for Trailer Deceleration
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Solution Overview
Problem
Commercial vehicles, especially trailers, often experience excessive deceleration and risk of wheel locking due to inadequate load-dependent braking systems, leading to unstable braking behavior, particularly in vehicle combinations with varying axle loads.
Innovation Solution
An electronic brake control unit in the towing vehicle continuously monitors and compares actual deceleration with a specified maximum, limiting brake pressure and communicating limiting status information to trailer brake electronics, which adjust trailer brake pressure based on wheel slip measurements to prevent overbraking and ensure balanced axle braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If brake pressure is increased to achieve desired deceleration, then deceleration performance is improved, but wheel locking risk increases
Solution Approach 1:
The brake control unit continuously monitors actual deceleration and compares it with desired deceleration, using this feedback to dynamically adjust brake pressure and prevent wheel locking while maintaining deceleration performance
Solution Approach 2:
The system dynamically adjusts brake pressure based on real-time deceleration conditions, transitioning from static brake pressure application to dynamic pressure modulation to optimize both deceleration and prevent wheel locking
2Reliability
If brake pressure is limited to prevent wheel locking, then wheel locking risk is reduced, but deceleration performance deteriorates
Solution Approach 1:
The system uses feedback from actual deceleration measurements to continuously optimize brake pressure, ensuring maximum deceleration is achieved without exceeding wheel locking thresholds
Solution Approach 2:
The system changes the brake pressure parameter dynamically based on deceleration conditions, adjusting pressure levels to maintain optimal deceleration while preventing wheel locking
3Device complexity
If trailer brake pressure is not adjusted for varying axle loads, then system complexity is reduced, but braking stability deteriorates
Solution Approach 1:
The towing vehicle's brake control unit performs multiple functions including monitoring its own deceleration, determining trailer brake pressure, and communicating with trailer brake electronics, eliminating the need for separate load sensing systems on the trailer
Solution Approach 2:
The brake control unit acts as an intermediary that receives deceleration information, processes it according to stored characteristic curves, and generates appropriate brake pressure commands for the trailer based on the coupling between vehicles
Data Source
AI summary
A method for decelerating a vehicle combination including a towing vehicle having a towing vehicle brake system and at least one trailer vehicle having a trailer brake system with an anti-lock brake system includes applying, by the towing vehicle brake system, a brake pressure to pneumatically operable wheel brakes of the towing vehicle according to a desired deceleration specified by a driver, and providing, by the towing vehicle brake system, a trailer brake pressure for the trailer brake system of the at least one trailer vehicle. An electronic brake control unit of the towing vehicle brake system: detects a current actual vehicle deceleration value continuously compares the current actual vehicle deceleration actual value with a maximum deceleration, and, when the current actual vehicle deceleration value reaches or exceeds the maximum deceleration, limits the brake pressure and provides an information signal.