Trailer Wheel Bearing Lock Detection for Brake Stabilization
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Solution Overview
Problem
Existing stabilization systems for vehicle trailers fail to reliably prevent trailer wheel blockage during braking, especially under varying load conditions and road surfaces, leading to potential swerving or skidding.
Innovation Solution
A stabilization system with a blocking detection device that uses a circuit routed via the wheel bearing to detect an electrical short circuit due to reduced lubricant film thickness, allowing for timely release of the wheel brake to prevent blockage, utilizing the difference in electrical resistance between the lubricant and bearing elements to control the brake actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the trailer brakes are always applied with the same application forces based on average parameter values, then the stabilization system is simple to operate, but the trailer wheels can lock up under light or no load and on smooth, slippery roads, severely impairing the transmission of lateral forces to the road and creating a risk of the trailer sliding sideways or skidding
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring the electrical resistance of the lubricant film in the wheel bearing. The evaluation device detects changes in resistance that indicate impending wheel lock-up, and this information feeds back to the brake actuator to dynamically adjust brake force, preventing lock-up while maintaining stability control
Solution Approach 2:
The system changes the operating parameters of the brake actuator based on detected conditions. When wheel lock-up is detected through lubricant film resistance changes, the brake actuator adjusts its output force parameter in real-time to prevent lock-up, transitioning from fixed average force to dynamic adaptive force application
2Adaptability or versatility
If pole wheels arranged on the wheel hubs with permanent magnets and coils or magnetic field sensors are used to detect speed and adapt brake intervention, then the brake intervention can be adapted to different speeds, but the design is relatively complex both in terms of construction and cost
Solution Approach 1:
The wheel bearing serves multiple functions: it provides mechanical support for wheel rotation and simultaneously acts as the detection sensor through its lubricant film's electrical resistance properties. This eliminates the need for separate speed detection devices like pole wheels with magnets and coils, reducing construction complexity while maintaining adaptability
Solution Approach 2:
The wheel bearing's lubricant film inherently provides the sensing function without requiring additional components. The electrical resistance of the lubricant film self-indicates the bearing load and speed conditions, allowing the system to adapt brake intervention using the existing bearing structure rather than adding complex external sensors
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
Effectively prevents trailer wheel blockage, enhancing tracking stability and reducing the risk of sideways swerving or skidding, without the need for complex pole wheels, and can be operated with either direct or alternating current.
Implementation Method 1
the lubricant commonly used in wheel bearings has a significantly higher electrical resistance compared to the outer and inner bearing elements
Implementation Method 2
the lubricant film thickness in the wheel bearing depends on the relative speed between the outer bearing element and the inner bearing element
Data Source
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AI summary
A stabilization system for a vehicle trailer has an anti-lock braking system with a locking detection device for detecting a locking trailer wheel (29), wherein the locking detection device comprises a circuit (33) routed via a wheel bearing (26) and an evaluation device (34) configured to detect an electrical short circuit between an outer bearing element (27) and an inner bearing element (28) due to a reduction in the lubricant film thickness (h).