Steering Torque Sensor Signal Line Architecture
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Solution Overview
Problem
Existing steering systems face delays in acquiring steering torque due to increased signal transmission time, leading to suboptimal steering feel, and complexity from multiple signal lines in electric power steering systems and steer-by-wire systems.
Innovation Solution
A steering system with a prioritized torque sensor and a redundant torque sensor, using dedicated signal lines for prioritized detection signals and a common signal line for redundant detection signals, reduces transmission time and complexity while maintaining redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If two detection values are transmitted by being integrated into one detection signal, then the information amount of the detection signal increases, but the time required to transmit the detection signal increases
Solution Approach 1:
The patent divides the transmission of detection values into two separate signal lines: one for transmitting the first detection value and another for transmitting the second detection value. This segmentation allows parallel transmission of multiple data elements, reducing the total transmission time while maintaining complete information transfer to the controller.
2Loss of time
If the respective detection units output detection signals separately, then the transmission time of detection signals is shortened, but the number of signal lines increases
Solution Approach 1:
The patent combines multiple detection signal lines into a single multiplexed signal line that transmits both the first and second detection values in an alternating manner. This merging approach reduces the number of physical signal lines required while maintaining the benefit of separate, parallel transmission paths through time-division multiplexing.
3Reliability
If multiple torque sensors are provided for redundancy, then the reliability of steering torque detection is improved, but the number of signal lines increases
Solution Approach 1:
The patent implements a universal signal transmission architecture where a single signal line can carry multiple types of detection data (first detection value from prioritized torque sensor, second detection value from redundant torque sensor) through time-division multiplexing. This multi-functional signal line reduces the overall number of cables and connections required in the steering system.
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 shortens the time to acquire steering torque, optimizes steering feel, and simplifies the system structure by reducing the number of signal lines while ensuring redundancy and high accuracy in motor actuation.
Implementation Method 1
The sensor IC includes a magnetic sensor such as a Hall element configured to detect the magnetic flux of the magnetic circuit
Data Source
AI summary
A steering system includes a prioritized torque sensor, a redundant torque sensor, a controller, a first signal line, a second signal line, and a common signal line. Each of the first signal line and the second signal line connects the prioritized torque sensor and the controller. The common signal line connects the redundant torque sensor and the controller. The prioritized torque sensor is configured to transmit, via the first signal line, a first prioritized detection signal. The prioritized torque sensor is configured to transmit, via the second signal line, a second prioritized detection signal. The redundant torque sensor is configured to transmit, via the common signal line, a first redundant detection signal and a second redundant detection signal.