Electropneumatic Brake Modulator for Trailer Rollover Prevention
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Solution Overview
Problem
Existing electropneumatic brake systems for towed vehicles, particularly drawbar trailers, are overly complex in configurations like 4S3M, which complicates the integration of additional safety functions such as roll stability support, and may not adequately prevent vehicle tipping during sharp turns.
Innovation Solution
A simplified electropneumatic brake system configuration with two 2S1M configurations per axle, where one modulator handles anti-lock functions and another modulator handles both anti-lock and stability functions, connected via a control line to share brake pressure, allowing for automatic braking when stability thresholds are exceeded, and utilizing a shuttle valve to manage pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a 4S3M configuration is used for electropneumatic brake systems, then measurement precision and stability control are improved, but device complexity increases significantly
Solution Approach 1:
The brake system is segmented into two independent 2S1M configurations, one for the tractor vehicle and one for the towed vehicle. Each configuration handles its own axle independently, avoiding the need for a complex centralized 4S3M system while maintaining effective stability control for each vehicle separately.
Solution Approach 2:
The stability control function is extracted from the traditional centralized brake system and integrated directly into the modulators of each vehicle. This allows each modulator to independently perform both anti-lock and stability functions without requiring a complex centralized control unit.
2Reliability
If additional stability functions are integrated into the brake system, then reliability is improved, but device complexity increases
Solution Approach 1:
The anti-lock braking function and stability control function are merged into a single integrated system where each modulator performs both functions. The modulator uses wheel speed signals for anti-lock control and lateral acceleration signals for stability control, combining multiple safety functions without requiring separate dedicated systems.
Solution Approach 2:
Each modulator is designed as a multi-functional unit that can perform both anti-lock braking and stability control functions. This universal design allows a single device to handle multiple safety requirements, reducing overall system complexity while improving reliability through integrated safety functions.
3Measurement precision
If a centralized control unit is used for stability functions, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
Each modulator independently calculates and processes stability control without requiring a centralized control unit. The modulator receives lateral acceleration signals and wheel speed signals, independently determines stability status, and executes appropriate braking actions. This self-service approach maintains measurement precision while eliminating complex centralized control infrastructure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces system complexity while effectively preventing towed vehicle rollover by integrating stability functions into the brake system, ensuring safer operation, particularly in scenarios like sharp turns, without the need for a central control unit.
Implementation Method 1
A control line leads from the connector of the first modulator to the brake pressure line between the second modulator and at least one of its wheel brake cylinders. The pressure in the control line to the second modulator can be regulated by way of actuation of a service brake pedal.
Implementation Method 2
A connecting line can be provided between the control line to the second modulator on one side and the control line on the first modulator on the other side, with a valve for shutting off the connecting line in the case of a higher pressure in the control line at the first modulator than in the control line to the second modulator.
Data Source
AI summary
In an electropneumatic brake system for a towed vehicle having at least two axles, such as a drawbar trailer, one axle is assigned a first modulator at least with an anti-lock function and another axle is assigned a second modulator at least with an anti-lock function and an additional function. Both modulators are connected to a reservoir pressure, and both modulators load wheel brake cylinders via brake pressure lines. The second modulator is connected to a control line and the first modulator has a connector for a control line. A control line leads from the connector for the control line on the first modulator to the brake pressure line between the second modulator and at least one of its wheel brake cylinders.