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Loss-Function을 이용한 내수 시장의 HSA 최적 Holding Time 고찰
이강원(Kangwon Lee),고은석(Eunseok Ko),구형찬(Hyoungchan Koo) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
The hill start in manual or automated manual transmission vehicles is faced by most users as inconvenient situation. In the time interval between brake pedal releasing and gas pedal pressing, the car might roll backwards, causing an unsafe or at least uncomfortable situation. Hill Start Assist system (HSA) is one of value additional functions (VAF) that assist to driver on hill road. This function currently presented offers a simple solution that assists the driver in such situation, keeping the vehicle stopped while the driver releases the brake pedal in hill condition with ESC solenoid valve control. Many control engineers usually spend much time for performance tuning such as standstill - fast stop with determining the slope, rollback and drag feel - smooth brake pressure release without reclining feeling backward. But they do not much care about Hill Holding Time. In this paper, we tried to find out the Korea market customer requirement about HSA Holding Time through consumer clinic and analyzed survey results with Regression Equation Model of the Loss Function.
ESC Performance Uniformity를 위한, Red-X 기법을 통한 Brake Pressure Rise Rate 연구
이강원(Kangwon Lee),노지훈(Jihoon Roh),구형찬(Hyoungchan Koo) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Recently, many vehicles are equipped electronic control systems to improve the vehicle performance and to secure the vehicle safety for the customers. Same tendency on active safety systems are also increased than few years ago. Those active safety systems are had to improve vehicle performance and safety. Furthermore, they can improve system robustness and performance uniformity. In this paper, I tried to establish the components that related the Brake Pressure Rise Rate for Electric Stability Control System performance, than confirmed the ESC performance uniformity with Red-X Strategy was derived from components. In this study, I used Red X strategies. GM has a 20-year association with the organization and uses Red X as a technical problem-solving tool, primarily after a vehicle is launched, to understand vehicle performance issues. We emphasizes that most issues can be corrected by finding the root cause and controlling it.
HIL Simulation을 위한 GPS 데이터 기반의 가상 도로 구축
김원욱(Wonwook Kim),최재신(Jaesin Choi),구형찬(Hyoungchan Koo) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Recently, almost of automotive company focus to improve simulation capability. Indeed, simulation is very useful method to evaluate and estimate vehicle performance. Because it is best way to save cost and time via computer simulation instead of physical test in vehicle development process. Although simulations had many benefits, simulations are used in only limited areas of vehicle development. Almost of vehicle dynamics simulation are executed objective tests that are evaluated vehicle performance using specific values, it doesn’t need special road for objective test that is tested in flat road. This paper is aimed to extend availability of simulation in vehicle dynamics. Although many test of vehicle dynamics evaluations are tested on public road, they didnt executed simulation on public roads. If they are able to execute simulation instead of physical test on public road, it will be able to simulate more number of test than physical. However, for simulation on public road, it needs to road profile same as public road. This paper proposes method of virtual road build for pre-work to evaluate public road in simulation environment. Virtual road is measured by RT4100 series that include GPS and Gyro sensor, process of virtual road build verified to construct having various condition roads.
백봉범(Bongbum Back),오정용(Jungyong Oh),구형찬(Hyoungchan Koo),양인석(Insuk Yang),김세혁(Sehyuk Kim),김영훈(Younghoon Kim),김한규(Hankyu Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The brake test during mountain descent is very important validation procedure at Car makers. Especially, in case of Korea car makers, They have designed the brake that was not occurred the vapor lock during Mt.Chiri descent with braking for Korea customers. Vapor lock is the dangerous phenomenon for driver and passengers who are driving on winding road at mountain. It makes driver cant stop the vehicle due that the brake fluid cannot transmit the brake line pressure in brake pipe from brake pedal to brake pads/linings in brake calipers / drum brakes. So, This brake test is essential a vehicle test procedure. This paper is based on Wearpro software was made by GM. and Brake Conner FE model analysis in order to predict the brake fluid temperature rise during Mt.Chiri descent. and To improve reliability of vehicle simulation model, We found brake dyno test is very helpful. and this paper is good approach concept for brake development such as saving cost and reducing development timing at beginning of Car project without vehicle level test by Brake CAE and Lab tests.
HIL Simulator를 이용한 차량동역학 제어기의 성능평가
노지훈(Jihoon Roh),김인동(Indong Kim),구형찬(Hyoungchan Koo),김형수(Hyoungsoo Kim),김영우(Youngwoo Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently ESC becomes to mandatory in many developed country and there are some performance requirement in regulation so, vehicle manufacturer need to perform the certification test. But physical test have limitation for the validation of complexity of vehicle variants. In this paper, HILS (hardware in the loop simulator) for vehicle dynamics controller is introduced and the process of construction is explained as well. finally, simulation test results are compared with physical test result for the analysis of reliability of simulation result.
Brake Torque Vectoring을 이용한 차량의 운전성 향상에 대한 연구
이종일(Jongil Lee),김인용(Inyong Kim),구형찬(Hyoungchan Koo),김형수(Hyoungsoo Kim),김영우(Youngwoo Kim),오승규(Seungkyu Oh),노지훈(Jihoon Roh),윤동필(Dongpil Yoon),이강원(Kangwon Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper presents a mathematical model of multi-dynamic vehicle model. A torque vectoring brake (TVB) system is proposed to improve the stability and the agility of vehicle. The algorithm of TVB system is proposed based upon a sliding model controller. The proposed algorithm optimizes control of wheel slip during the inside of vehicle wheel slip. ISO standard test procedure is used to evaluate the performance of TVB system. The TVB performance is numerically implemented using MATLAB and CarSim commercial software. The simulation results show the acceptable performance of TVB comparing without TVB. For conclusion, the TVB system is developed and evaluated to improve vehicle dynamic characteristics and handling performance. The TVB system shows the better handling performance and agility specially under-steer control situation.
시뮬레이션 기반의 ESC 법규 적합성 시험을 위한 HIL Simulator 개발
김원욱(Wonwook Kim),이종일(Jongil Lee),구형찬(Hyoungchan Koo) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
As increasing the consumer’s needs for safety system, the tendency of an increasing number of country that legislate mandatory regulation for ESC equipment. In Europe and North America countries, all vehicles are already sold equipped with ESC system. After a few years, vehicles without ESC won’t be sold in many countries and will meet the regulation requirements for certification test. However as an increasing number of country that require to equip ESC system, a number of certification test by OEM are increasing. Also vehicle has many variant in same model because OEMs develop the vehicle to reflect consumer’s various need s in each country. Because of this, ECE R13, regulation for braking in Europe, allows homologation to be undertaken by test-supported simulation. If vehicle has been physically tested, the compliance of versions or variants of that same vehicle type can be demonstrated by computer simulation. This paper is evaluated vehicle model compare with real vehicle for simulation-based ESC regulation test and compliance test.
Brake Dynamo Data를 기반으로 한 제동성능예측
백봉범(BongBum Back),오정용(Jungyong Oh),구형찬(Hyoungchan Koo) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, the vehicle modeling process using BrakeSyn has been studied for Brake system development. For most motor companies, it is the main task to improve own competitiveness through reducing development time and cost. But, this is difficult due that a lot of tests is needed to achieve good performance and quality. As a solution of this conflict, motor companies have tried to substitute road tests by simulation. BrakeSyn is the simulation tool created by GM (General Motors Inc.). BrakeSyn has been mainly used for the brake performance simulation in GM. BrakeSyn has a merit on easy use and quick result acquisition with its convenient interface. Also, BrakeSyn can simulate the brake performance like brake balance, brake pedal feel, etc. Generally. whenever vehicle brake system is changed during development. additional time and cost are needed for new brake system development. BrakeSyn could be an effective tool to reduce this overlapping time and cost. In this paper, current vehicle modeling process using BrakeSyn has been specified and studied. Based on this study, it is the final purpose of this paper to contribute to reduce the vehicle development time and cost using reliable simulation result.
eBoost 차량의 EPB (Electric Parking Brake) Dynamic Braking Function의 효용성 연구
이강원(Kangwon Lee),박영준(Youngjoon Park),구형찬(Hyoungchan.Koo) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
The Electric Parking Brake (EPB), the boom started - with a concentration on caliper integrated systems and with an integration of the ECU into the ESC system and also eBoost vehicles increased. There is a wide range of requirements with enough dynamics and control comfort – Dynamic Braking during vehicle running. It can be a considerable alternative of backup brake system for eBoost vehicles because eBoost system have no vacuum booster and there are the possibilities of an electrical or electronic problem. So, EPB dynamic braking function have to meet statutory performance requirements for service brake and also to meet the customer requirement – deceleration feeling. In this paper, we confirmed statutory performance requirements for EPB dynamic braking and we tried to find out the Korea market customer requirement about EPB target deceleration through customer clinic and analyzed survey results with regression equation model of the Loss Function. Through this study, we identified target deceleration that minimize customer dissatisfaction and we confirmed the possibility of variable target deceleration value of EPB Dynamic Braking through the regression equation model for each reference vehicle speed.
이강원(Kangwon Lee),박동환(Donghwan Park),구형찬(Hyoungchan Koo) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Recently, many vehicles are equipped All Wheel Drive system to improve the vehicle performance for the customers satisfaction especially traction and handling performance by optimum driving force distribution to the front/rear wheels. It is expected that vehicle stability more improved 4WD could manage vehicle behavior. In this study, we discussed the impact of Direct Yaw Control AWD systems (DYC AWD Systems) on the combined acceleration and turning performance as it pertains to maneuverability and stability, then developed the Integrated AWD and TCS/ESC System. This system controls deceleration according to the information on vehicle lateral jerk. The focus of Integrated AWD and TCS/ESC control are to think of ways to maximize each AWD and TCS/ESC system efficiency and synergy effect by Integration control for improvement of vehicle maneuverability and stability on all road surfaces. Through this study, we could see the effect of the integration system by simulation results.