• Transactions of the Korean Society of Automotive Engineers
• /
• v.25 no.1
• /
• pp.103-110
• /
• 2017

Most commercial vehicles have adopted the hydraulic power steering system. To reduce fuel consumption and to improve steering controllability, a hybrid electric power steering system is being developed for commercial vehicles. In this study, the HILS (Hardware In the Loop Simulation) system equipped with a commercial vehicle hybrid electric power steering system was developed and the vehicle dynamic performance of a truck with the steering system was evaluated. The hybrid electric power steering system is composed of the EHPS motor pump, column mounted EPS system, and ball nut steering gear box for heavy commercial vehicles. The accuracy of vehicle models equipped with the HILS system was verified with comparisons between the simulation results and field test results. The road reaction forces of the steering system were generated from the vehicle model and verified using field test results. Step steering tests using the verified HILS system were carried out and the performance of a newly developed commercial vehicle hybrid electric power steering system was evaluated.

• Proceedings of the KIPE Conference
• /
• 2009.11a
• /
• pp.99-101
• /
• 2009

자동차의 조향 장치에서 연비 절감과 조향성능의 향상을 위해 연구되고 있는 전동식 파워스티어링 시스템은 기존의 유압식에 비해 소음과 진동이 발생하는 단점을 가지고 있다. 이를 감소시키기 위해 토크 리플을 줄이는 것이 관건이고, 토크 리플을 발생시키는 큰 원인 중 하나가 위치 센서 분해능 제한이다. 본 논문에서는 가격 절감을 위해 낮은 분해능의 위치 센서로 전동식 파워스티어링 시스템의 토크 리플을 저감하기 위해 위치 추정 기법을 제안하고, 실험을 통해 이를 검증하였다.

• Journal of Internet of Things and Convergence
• /
• v.9 no.2
• /
• pp.61-69
• /
• 2023

In recent years, due to heightened environmental awareness, Electric Power Steering (EPS) has been increasingly adopted as the steering control unit in manufactured vehicles. This has had numerous benefits, such as improved steering power, elimination of hydraulic hose leaks and reduced fuel consumption. However, for EPS systems to respond to actions, sensors must be employed; this means that the consistency of the sensor's linear variation is integral to the stability of the steering response. To ensure quality control, a reliable method for detecting defects and assessing linearity is required to assess the sensitivity of the EPS sensor to changes in the internal design characters. This paper proposes a data-driven defect and linearity assessment monitoring system, which can be used to analyze EPS component defects and linearity based on vehicle speed interval division. The approach is validated experimentally using data collected from an EPS test jig and is further enhanced by the inclusion of a Graphical User Interface (GUI). Based on the design, the developed system effectively performs defect detection with an accuracy of 0.99 percent and obtains a linearity assessment score at varying vehicle speeds.