Steering Sensor Assembly Using Power-Line Index Signaling
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Solution Overview
Problem
Existing electromechanical steering systems face challenges in reliably and quickly detecting straight-ahead driving without increasing implementation effort, cabling requirements, and costs, particularly due to the use of index sensor units.
Innovation Solution
A sensor assembly for electromechanical steering systems that uses a torque sensor unit and an index sensor unit connected via a power supply line, transmitting index signals by modulating them onto the power supply line, eliminating the need for additional cabling and allowing for fast detection of straight-ahead driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an index sensor unit is added to improve detection speed and reliability, then straight-ahead driving detection is improved, but cabling effort and implementation complexity increase
Solution Approach 1:
The patent combines the index sensor unit with the existing torque sensor unit into a single integrated sensor assembly. The index sensor detects angular position while the torque sensor measures steering torque, and both are processed by a single control device. This merging eliminates the need for separate cabling for the index sensor and reduces overall system complexity while maintaining improved detection reliability.
Solution Approach 2:
The control device is designed to handle multiple sensor types and functions through a unified interface. It processes both torque signals from the torque sensor unit and index signals from the index sensor unit, enabling the system to perform multiple detection functions (torque measurement, position detection, straight-ahead driving recognition) through a single control unit rather than requiring separate dedicated circuits for each function.
2Loss of time
If an index sensor unit is added to improve detection speed, then response time is reduced, but material costs and assembly costs increase
Solution Approach 1:
The patent integrates the index sensor unit with the torque sensor unit into a single sensor assembly that is assembled as one unit. This combined assembly reduces assembly steps and labor costs compared to installing separate index sensors and torque sensors independently. The integrated design allows for standardized mounting and simplified calibration procedures, further reducing assembly costs while maintaining fast detection response.
3Loss of information
If additional cables and electrical conductors are used for index sensor connection, then signal transmission capability is improved, but standardized interfaces cannot be guaranteed
Solution Approach 1:
The control device incorporates a universal communication interface that can handle both torque sensor signals and index sensor signals through the same connection. This unified interface maintains standardized connectors and communication protocols, ensuring compatibility with existing vehicle steering systems while providing enhanced signal transmission capability for the additional index sensor data.
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
Enables reliable and fast detection of straight-ahead driving with reduced implementation effort and costs, while maintaining the use of standardized interfaces, by utilizing a power supply line for signal transmission.
Implementation Method 1
a torque sensor unit (4) connected to a control device (3) by means of a power supply line (6) in order to supply it with electrical energy
Implementation Method 2
an index sensor unit (5)...transmitting an index signal of the index sensor unit (5) to the control device (3)
Implementation Method 3
a power supply line (6) in order to supply it with electrical energy
Data Source
AI summary
A sensor assembly for an electromechanical steering system of a motor vehicle may include a measuring device and a control device. The measuring device may include a torque sensor unit and an index sensor unit. The torque sensor unit may be connected to the control device by a power supply line to supply said unit with electrical energy. The sensor assembly is configured to transmit an index signal of the index sensor unit to the control device by modulating a signal that is transmittable via the power supply line.