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스마트폰을 이용한 신호 처리 기반 벨트 텐션 측정 Application 개발
김승웅(Seungung Kim),박주표(Jupyo Park),최현석(Hyunsuk Choi),이흥택(Heungtaek Lee),김경래(Kyunglae Kim) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Currently, automobile steering system is increasingly being converted to electrified parts. In the electric steering system, the proportion of parts designed to generate high Rack force against high load is used as a Belt-type R-EPS is increasing. Accordingly, in the event of a problem of Belt-type R-EPS part, a partial replacement is required in order to reuse the usable parts, which is accompanied by an adjustment and inspection in terms of belt tension. Belt Type R-EPS partial replacement is possible only if a repair shop owns a tension meter necessary for belt tension adjustment, so it is being implemented limitedly. In this study, among the methods that can cope with the tension meter used for belt tension inspection, possible method is being reviewed without a tension meter by using mobile phone sound source, furthermore by developing a mobile application, it can be used in a repair shop in near future.
조향 시스템 안전평가기준 도출을 위한 운전자 조향휠 파지력 연구
홍석일(Seokil Hong),김도환(Dohwan Kim),구태윤(Taeyun Koo),조성근(Seongguen Cho),김경래(Kyunglae Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
The Steer-by-Wire system is expected to be an essential part of autonomous vehicles. The characteristic of the SbW system without mechanical connections requires ISO 26262 functional safety assessments to be carried out as they require high-level safety standards. Current vehicle safety assessments such as Hazard Metric Test and Safety Validation Test define the lateral acceleration or lateral deviation as criteria, however the results may be affected by the steering wheel grip force of each driver. Therefore, this study analyzed steering wheel grip force during driving of 56 subjects, and presented the objective safety assessment criteria. This study is expected to be used as a assessment criteria in the future when conducting Safety Validation Tests.
Steer-by-Wire System의 성능 시험 방법론 연구
이창희(ChangHee Lee),오하영(HaYeong Oh),이성일(SeongIl Lee),김경래(KyungLae Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
Steer-by-Wire(SbW) is an electric vehicle system without mechanical linkage between steering wheel and front wheel. The advantages of this system are flexible vehicle packaging, S/W tunable steering ratio and response. Without mechanical linkage, driver’s steering intention is transferred by electrical signal and it causes control architecture’s change. EPS system measures driver’s steering torque and boost it with motor. On the other hand, SbW system measures driver’s steering angle and control rack position with motor. In this study, we tried to define bench test procedure for SbW control architecture and perform the test for SbW performance.
이성일(Seongil Lee),이창희(Changhee Lee),구태윤(Taeyun Koo),김경래(Kyunglae Kim) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
To accelerate system testing at early development stage of the product development process, model-based system testing capabilities are developed. Urgent needs to enhance efficiency, reduce costs and protect the vehicle test drivers from hazardous incidents were among its original intentions. Most of the steering related bench performance tests were confined to basic measurements of mechanical or electrical characteristics of the steering system in the past. But the advent of digital era has made the bench test go beyond the rigs to simulate the realistic behavior of UUT under vehicle environment. Actuators can now be individually controlled with precision to generate realistic forces and positions in real-time to produce vehicle dynamics which are calculated by vehicle model. By using this kind of methods most of the steering maneuvers could be realistically reproduced with no hazard to the driver and steering characteristics could be investigated in a more quantified manner. For High-risk steering maneuvering, the entire spectrum of the vehicle tests were listed and screened to choose the most-hardto-quantify and risky tests and tests were conducted by using HILS platform on a correlated and automated basis. Beside this, reinforced performance testing conditions were developed for validation of steering dynamics and BSR related testing. And by doing that prepared for the autonomous driving test base onwards. The methods proposed here allowed to keep the model based test as references for steering performances, thus, increasing the effectiveness of the validation by reducing the number of vehicle test at an early stage of development.
Steer by Wire 시스템의 Road feedback 조타감 개선 연구
연제현(Jehyeon Yeon),전동일(Dongil Jeon),신동훈(Donghoon Shin),김경래(Kyunglae Kim) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
Steer by wire (SbW) is an electric steering system where the mechanical linkage between the steering wheel and front wheels is eliminated. The advantages of this system are easy to use, elimination of noise-vibration-harshness of steering system caused by road forces. But steering feel, especially road feedback can’t be transferred overall information from road condition compared to conventional electric steering system. We tried to improve the performance of road feedback by adjusting control logic and steering tuning with STEERITE. In addition, the road feedback performance was compared and verified through subjective and measurement evaluation during actual vehicle operation before and after improvement.