Electromagnetic Brake Steering Column Energy Absorption
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Solution Overview
Problem
Existing vehicle steering column energy absorption systems are limited by discrete energy absorption settings, leading to complexity and increased cost, and lack the ability to provide adjustable energy absorption based on the steering column's adjustment position.
Innovation Solution
An electromagnetic brake mechanism is integrated into the steering column energy absorption system, allowing for adjustable braking force on a tooth rack or jacket teeth, enabling continuous energy absorption adjustment between low and high settings, and adaptable to various operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If discrete energy absorption settings are used, then the system is simpler to manufacture, but the adaptability and control precision are limited
Solution Approach 1:
The patent replaces mechanical discrete switching mechanisms with an electromagnetic brake system that uses magnetic fields to provide continuous, adjustable braking force. The electromagnetic brake mechanism allows for smooth, continuous adjustment of energy absorption characteristics without mechanical linkages or discrete switches, thereby improving adaptability while reducing overall system complexity.
Solution Approach 2:
The patent changes the physical state and properties of the electromagnetic brake mechanism to achieve variable braking force. By adjusting electrical parameters (voltage, current) to the electromagnetic brake, the system can continuously modify the braking force and energy absorption characteristics, enabling precise control over the energy absorption process without discrete settings.
2Adaptability or versatility
If multiple discrete energy absorption settings are added, then the adaptability improves, but the device complexity and cost increase
Solution Approach 1:
The electromagnetic brake mechanism serves multiple functions: it provides braking force, enables continuous energy absorption adjustment, and can operate at various energy absorption levels simultaneously. This single multi-functional component replaces what would otherwise require multiple discrete settings or separate mechanisms, reducing overall system complexity while maintaining high adaptability.
Solution Approach 2:
The system transitions from static discrete settings to dynamic continuous adjustment. The electromagnetic brake allows real-time, continuous modification of energy absorption characteristics based on operational requirements, providing adaptability without requiring multiple fixed components or settings.
3Reliability
If pyrotechnic actuation is used, then the energy absorption is reliable, but the adaptability is limited to high or low settings only
Solution Approach 1:
The patent replaces pyrotechnic chemical actuation with an electromagnetic braking system. The electromagnetic brake provides reliable energy absorption through controlled magnetic fields while enabling continuous adjustment of braking force, thereby maintaining reliability but significantly improving adaptability to various energy absorption settings.
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
The system provides enhanced safety and flexibility by allowing customizable energy absorption, improving occupant safety during energy absorption events and reducing complexity and cost by enabling continuous adjustment of braking force.
Implementation Method 1
an electromagnetic brake mechanism engageable with the tooth rack to exert a braking force on the tooth rack
Data Source
AI summary
An energy absorption system for a vehicle steering column includes a lower jacket. The energy absorption system also includes an upper jacket operatively coupled to, and moveable relative to, the lower jacket. The energy absorption system further includes a tooth rack operatively coupled to the upper jacket. The energy absorption system yet further includes an electromagnetic brake mechanism engageable with the tooth rack to exert a braking force on the tooth rack.