Steering Torque Sensor Midpoint Correction for Remote Driving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing steering torque sensors in vehicles suffer from midpoint offset errors due to external factors, necessitating correction methods that often require additional devices like cameras to confirm zero torque conditions, which is impractical for remote driving scenarios.
Innovation Solution
A midpoint correction device and method that stores steering torque data as an offset amount during remote driving, allowing for accurate correction using a nonvolatile storage device without additional sensors, and applies vibration torque to release residual torque for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If midpoint correction is performed using detection values when the ignition switch is turned off, then the correction can be performed without special devices, but it cannot ensure that no torque is acting on the steering shaft
Solution Approach 1:
The system performs preliminary actions by detecting steering torque values before remote driving control starts, during remote driving control, and after it ends. It stores these values in advance and selects the most appropriate one based on predefined conditions, ensuring accurate midpoint correction without requiring special devices during operation.
Solution Approach 2:
The system implements feedback by continuously monitoring steering torque detection values at different stages (before, during, and after remote driving) and using this feedback to determine the optimal midpoint offset amount. The control unit compares detection values against stored data and selects the most accurate correction value based on the feedback from multiple measurement points.
2Measurement precision
If special devices like cameras are used to detect when no torque acts on the steering shaft, then accurate midpoint correction can be achieved, but the device complexity and cost increase
Solution Approach 1:
The steering torque sensor and control unit perform self-service by using the existing torque detection capability to identify the midpoint state. The system leverages its own detection function to determine when no torque is acting on the steering shaft, eliminating the need for external cameras or special sensing devices.
Solution Approach 2:
The control unit serves multiple functions: it controls remote driving operations, stores detection values, determines driving states, and performs midpoint correction calculations. This multi-functionality eliminates the need for separate dedicated devices, reducing overall system complexity while maintaining correction accuracy.
3Measurement precision
If steering torque detection values are stored during remote driving control, then accurate midpoint offset can be obtained, but data storage and processing requirements increase
Solution Approach 1:
The system extracts only the essential data needed for midpoint correction by storing specific steering torque detection values at critical moments (before, during, and after remote driving). It extracts and stores only the relevant torque values rather than continuous data streams, minimizing storage requirements while maintaining correction accuracy.
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 accurate midpoint correction of steering torque sensors during remote driving operations without additional equipment, ensuring precise torque detection for vehicle control systems.
Implementation Method 1
a steering torque sensor provided in the steering transmission system between the steering wheel and the torque applying device, and configured to detect, as steering torque, a torque acting on a steering shaft
Implementation Method 2
storing, in a nonvolatile storage device, steering torque detected by the steering torque sensor as a midpoint offset amount of the steering torque sensor
Implementation Method 3
a torque applying device for applying control torque to a steering transmission system between a steering wheel and a steered wheel
Data Source
AI summary
A midpoint correction device for performing midpoint correction of a steering torque sensor, which is applied to a vehicle provided with a EPS device that applies control torque to a steering transmission system between a steering wheel and a steered wheel, and a steering torque sensor provided in the steering transmission system, includes a control unit that includes a nonvolatile storage device and performs remote operation control of the vehicle, and the control unit stores the steering torque detected by the steering torque sensor in the storage device as a midpoint offset amount in a state where the remote operation control is performed, reads the midpoint offset amount from the storage device during traveling of the vehicle, and corrects the steering torque detected by the steering torque sensor with the midpoint offset amount, thereby performing midpoint correction.