Steering Column Position Sensing with Absolute Reference Detection
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Solution Overview
Problem
Existing steering column position detection systems are complex and maintenance-intensive, with relative measurement methods prone to errors and inaccuracies, such as falsified measured values and position drift, which can lead to unreliable operation and safety issues.
Innovation Solution
A steering column with a position detection device comprising a first sensor unit for relative position detection and a second sensor unit for absolute position detection, using a transmitter and receiver module to generate signals that indicate specific adjustment positions, allowing for reliable and robust operation by correcting sensor values and controlling vehicle subsystems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a relative measurement method is used for position detection, then the device complexity is reduced, but measurement precision deteriorates due to position drift and falsified measured values
Solution Approach 1:
The patent introduces a magnetic field as an intermediary between the transmitter module (attached to the actuating unit) and receiver module (attached to the support unit). This magnetic field intermediary enables absolute position detection without mechanical contact, eliminating position drift while maintaining system simplicity. The magnetic field serves as a reliable mediator that preserves measurement accuracy over time.
2Reliability
If a robust position detection system is implemented, then reliability improves, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical position detection systems with a magnetic field-based detection system. The transmitter module generates a magnetic field that is detected by the receiver module, eliminating the need for complex mechanical linkages, contact sensors, or multiple sensor units. This substitution maintains high reliability through contactless detection while significantly reducing mechanical complexity.
3Measurement precision
If absolute position detection is implemented using transmitter and receiver modules, then measurement precision improves, but device complexity increases due to additional components
Solution Approach 1:
The transmitter module serves multiple functions: it generates the magnetic field for position detection, acts as a reference point for absolute measurement, and provides a signal that can be detected at various positions along the adjustment range. The receiver module similarly performs multiple detection functions. This multi-functionality reduces the need for separate dedicated components for each measurement function, thereby achieving high measurement precision without proportionally increasing complexity.
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 solution provides a simple, robust, and reliable position detection system that prevents collisions, ensures accurate airbag deployment, and optimizes vehicle safety by distinguishing between steering column states, thereby enhancing the reliability and safety of the steering column's operation.
Implementation Method 1
a receiver module (21, 26) arranged on the support unit (2) and designed to detect the magnetic field (20, 25) generated by the transmitter module (20, 25)
Data Source
Figure 1~2
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Figure 5~6
AI summary
The present invention relates to a steering column (1) for a motor vehicle, comprising an actuating unit (6), in which a steering spindle (7) is rotatably mounted and which is held in an adjustable manner by a supporting unit (2), an adjustment device (9, 10) for adjusting the actuating unit (6) in relation to the supporting unit (2), and a position-sensing device (11, 12) which comprises a first sensor unit (18, 23) for sensing the position of the actuating unit (6) in relation to the supporting unit (2), wherein the position-sensing device (11, 12) comprises a second sensor unit (19, 24) for sensing a state when the actuating unit (6) is in a predetermined position relative to the supporting unit (2).