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R&H 성능 최적화를 위한 다중해 기반 대화형 목표전계 기법 개발
장세현(Sehyun Chang),이병림(Byungrim Lee),박영대(Youngdae Park),조현석(Hyunseok Cho),김민준(Minjun Kim),황상우(Sangwoo Hwang) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
This paper proposes Multiple-solution based interactive target cascading. Compared with a classical point-based design which is aimed to optimize an objective function subjected to given constraints, the proposed method performs sensitivity analysis for the range of design variables (DV) first. Then multiple solutions are obtained by performing optimization for subdivided target performance index (PI) range. The set of all data such as DV and PI is stored in database so that a designer can choose a best design set using DB query and data visualization which provides the insight of the connection between DV and PI graphically. The proposed multiple-solution based interactive target cascading is implemented to improve the vehicle handling performance, particularly enhancing frequency responses of sine sweep steer and maximize the linearity of lateral acceleration during constant radius cornering. It shows that the proposed approach may be useful not only for the conceptual stage in the early phases of vehicle development but also during the development stage to enhance vehicle performance.
목표 조타토크 맵 기반 랙반력 피드백 MDPS 제어로직 개발
장세현(Sehyun Chang),이병림(Byung Rim Lee),박영대(Young Dae Park),조현석(Hyun Seok Jo),김민준(Minjun Kim),장봉춘(Bongchoon Jang),이동필(Dongpil Lee) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
This paper proposes new rack force feedback control logic of a motor driven power steering (MDPS). The proposed control logic consists of a 3 dimensional map of target steering torque and control logic for target torque following. The 3 dimensional map of steering torque is defined by using target steering torque vs. steering angle curves of weave and transition tests. This 3 D map of steering torque provides control logic with target steering torque according to steering angle and angular velocity inputs. Then adaptive sliding mode control (ASMC) determines steering assist torque in order to achieve the target steering torque. ASMC is designed by considering rack force, steering system friction, and uncertainty of a steering system to reach a sliding surface which is defined by combining target torque tracking error and its integral. Simulation study is used to investigate the performance of the proposed control first, and then Hardware-in-the-Loop Simulation(HILS) is utilized in order to evaluate its performance in a real steering system. It shows that the proposed control logic can achieve excellently the target steering torque with respect to on-center steering tests.
김민준(Minjun Kim),장세현(Sehyun Chang),이병림(Byungrim Lee),박영대(Youngdae Park),조현석(Hyunseok Cho) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.3
In this paper, a new estimation method is proposed to calculate steering rack axial force using a 3 dimensional tire mesh model when a car is standing on the road. This model is established by considering changes of camber angle and contact patch between the tires and the ground according to steering angle. The steering rack bar axial force is estimated based on the static equilibrium equations of forces and moments. A tire friction force is supposed to act on the center point of the contact patch, and the proportional coefficient of friction depending on contact patch is suggested. Using the proposed estimation method, rack axial force sensitivity analysis is evaluated according to changes of suspension geometry. Then optimal motor power of Motor Driven Power Steering(MDPS) is evaluated using suggested rack forces.
조타감 성능 목표 달성을 위한 모델 기반 MDPS 제어맵 최적화 설계
박영대(Youngdae Park),이병림(Byungrim Lee),장세현(Sehyun Chang),조현석(Hyunseok Cho),김민준(Minjun Kim),황상우(Sangwoo Hwang) 한국자동차공학회 2019 한국 자동차공학회논문집 Vol.27 No.10
The development of the steering feel performance of a vehicle is primarily carried out by tuning the motor-driven power steering(MDPS). The motor-driven power steering provides a lot of parameters for developers in order to maximize the steering feel performance. However, it needs a lot of time and effort, so the development efficiency is not favorable. In order to improve the development efficiency, this paper proposes an optimal design method and process of MDPS logic as follows. First is the definition of quantitative targets for multiple tests that may indicate steering feel performance, second is the construction of the vehicle and control model for checking the steering feel performance, and third is the process proposal to optimize the MDPS logic parameters. This method and process is validated through the comparison of the simulation and test results.
김민준(Minjun Kim),이병림(Byungrim Lee),장세현(Sehyun Chang),박영대(Youngdae Park),조현석(Hyunseok Cho),황상우(Sangwoo Hwang) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.6
Column type of motor driven power steering(C-MDPS) system has been developed for driving convenience and fuel efficiency. Nowadays, it requires agile vehicle response when driver tries to steer the steering wheel. So rack type MDPS(R-MDPS) system is often considered to improve vehicle response, but it is difficult to apply due to package problem and high cost. This paper proposes a design methodology about C-MDPS vehicle in terms of maximizing vehicle response. Among various design parameters which affect vehicle response, this paper deals with steering and suspension system design factors. The main parameters in the steering system are component characteristics such as friction level or torsion bar stiffness. The main parameters in the suspension system are kinematic and compliance (K&C) characteristics such as lateral force stiffness or kinematic displacement. In this paper, influence analysis method and optimization process for these factors are suggested.
조타감 성능 목표 달성을 위한 모델 기반 MDPS 제어맵 최적화 설계
박영대(Youngdae Park),이병림(Byungrim Lee),장세현(Sehyun Chang),조현석(Hyunseok Cho),김민준(Minjun Kim),황상우(Sangwoo Hwang) 한국자동차공학회 2019 한국 자동차공학회논문집 Vol.27 No.9
The development of the steering feel performance of a vehicle is primarily carried out by tuning the motor-driven power steering(MDPS). The motor-driven power steering provides a lot of parameters for developers in order to maximize the steering feel performance. However, it needs a lot of time and effort, so the development efficiency is not favorable. In order to improve the development efficiency, this paper proposes an optimal design method and process of MDPS logic as follows. First is the definition of quantitative targets for multiple tests that may indicate steering feel performance, second is the construction of the vehicle and control model for checking the steering feel performance, and third is the process proposal to optimize the MDPS logic parameters. This method and process is validated through the comparison of the simulation and test results.
[기술논문] 차량 전장 부품 특성이 MDPS 조타 토크에 미치는 영향
조현석(Hyunseok Cho),이병림(Byungrim Lee),장세현(Sehyun Chang),박영대(Youngdae Park),김민준(Minjun Kim) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.6
For the robust design of Motor Driven Power Steering (MDPS) systems, it is important to consider energy efficiency from every aspect such as system configuration and current flow, etc. If design optimization is not considered, it has many problems on a vehicle. For example, when evaluating steering test, particularly the Catch-up test which turning the steering wheel left or right quickly, steering effort should be increased rapidly. Also a vehicle might have poor fuel efficiency. In this study, it is calculated energy consumption for each component of the steering system and analyzed factors of energy consumption. As a result, this paper redefines a method to estimate steering input torque using characteristics of vehicle electric components and then conducts an analysis of contribution for the Catch-up.
R&H 성능 산포 개선을 위한 민감도 분석 및 공차 설계
조현석(Hyeonseok Cho),이병림(Byungrim Lee),장세현(Sehyun Chang),박영대(Youngdae Park),김민준(Minjun Kim),황상우(Sangwoo Hwang) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.6
Recently, many people use cars not simply as a means of transportation, but also as a means to enjoy the act of driving the vehicle. In addition, various vehicle performance, such as ride comfort and handling stability, are being required. In response to these needs, car companies are committed to developing vehicles by improving the driving performance starting from the design phase. Research for the improvement of ride comfort and handling stability is becoming more important with the increasing sophistication of cars. This paper describes a process by suspension and steering components of the dispensing system in order to review the effect on driving performance by using an analytical method, and utilizing the DOE for the review to derive the most definitive factor regarding performance variation.