Angle Sensor Module for Vehicle Steering Device Based on Multi-Track Impulse Ring

Abstract

In step with the development of Industry 4.0, research on automatic operation technology and components related to automobiles is continuously being conducted. In particular, the torque angle sensor (TAS) module of the steering wheel system is considered to be a core technology owing to its precise angle, torque sensing, and high-speed signal processing. In the case of conventional TAS modules, in addition to the complicated gear structure, there is an error in angle detection due to the backlash between the main and sub-gear. In this paper, we propose a multi-track encoder-based vehicle steering system, which is incorporated with a TAS module structure that minimizes the number of components and the angle detection error of the module compared with existing TAS modules. We also fabricated and tested an angle detection signal processing board and evaluated it on a test stand. As a result, we could confirm its excellent performance of an average deviation of 0.4° and applicability to actual vehicles by evaluating its electromagnetic interference (EMI) environmental reliability. The ultimate goal of the TAS module is to detect the target steering angle with minimal computation by the steering or main electronic control unit (ECU) to meet the needs of the rapidly growing vehicle technology. The verified angle detection module can be applied to an actual steering system in accordance with the mentioned technical requirements.

Implementation and evaluation of motion detection module based on hall sensors for the geared motor of automatic gate

“…The fabricated impulse ring has 104–212 square waveforms at a rotation speed of about 8–17 Hz, so the channel for RPM detection is sufficient. Impulse rings were fabricated using ferrite (89.7%), NBR rubber (10%), and SUS304 stainless steel (0.03%) based on the simulation . The impulse rings were 18 mm in outer diameter, 10 mm in inner diameter, and 3.4 mm in height.…”

Micro-electromechanical system based optimized steering angle estimation mechanism for customized self-driving vehicles

“…However, the steering control could have been further improved by also introducing longitudinal control. An improved TAS module-based vehicle steering control has been proposed in Woo et al 6 to improve the state-of-the-art TAS module with a fewer number of physical components and has shown increased performance with minimum angle estimation error as compared to the previous steering angle modules. However, they did not consider the utilization of the steering angle module in steering automation of the customized autonomous logistic vehicles.…”

“…5 In another research work, GNSS and the gyroscope-based mechanism is presented to determine the steering angle by taking two parameters (rate of heading inclination and acceleration rate) into account using Kalman filter. 6 Though, these relative angle sensors have improved the accuracy by reducing the additive bias in the estimated steering angle. However, the GNSS/gyroscope based steering angle measurement systems are much reliant on the satellite data which have signal spoofing, precision, and jamming concerns.…”

“…[7][8][9][10] Moreover, the TAS/electro-magnet based steering angle sensors return distorted signals when their positive and negative phase shafts switch arbitrarily which leads to continuous error in estimated steering angle. 11 Besides, the researchers [5][6][7][8][9][10][11] have not presented any scheme for the practical implementation of these sensors in the steering automation of customized self-driving vehicles.…”