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international conference on vehicular electronics and safety | 2012

Emergency collision avoidance maneuver based on nonlinear model predictive control

Chulho Choi; Yeonsik Kang; Seang-Wock Lee

In this study, nonlinear model predictive control (NMPC) is proposed for performing emergency collision avoidance maneuvers. NMPC is employed as a high-level controller that simultaneously controls the longitudinal and the lateral vehicle motion. The designed emergency collision avoidance controller considers the constraints of maximum wheel steering angle and maximum acceleration. NMPC predicts vehicle position using open-loop dynamics and calculates the optimized wheel steering control input and acceleration control input. A collision avoidance maneuver that does not consider vehicle dynamics may not avoid obstacles. In the worst case, it may transition into another dangerous situation. The performance of the proposed collision avoidance maneuver is simulated in Matlab/Simulink and CarSim, a realistic commercial simulation software.


ASME 2011 Internal Combustion Engine Division Fall Technical Conference | 2011

A Study on the Performance and Emissions Characteristics of a DI Compression Ignition Engine Operated With LPG and DTBP Blending Fuels

Hoin Kang; Jerald A. Caton; Seang-Wock Lee; Seokhwan Lee; Seungmook Oh

LPG (Liquefied Petroleum Gas) has been widely used as an alternative fuel for gasoline and diesel vehicles in light of clean fuel and diversity of energy resources. But conventional LPG vehicles using carburetors or MPI fuel injection systems can’t satisfy the emissions regulations and CO2 targets of the future. Therefore, it is essential to develop LPG engines of spark ignition or compression ignition type such that LPG fuel is directly injected into the combustion chamber under high pressure. A compression ignition engine using LPG is the ideal engine with many advantages of fuel economy, heat efficiency and low CO2 , even though it is difficult to develop due to the unique properties of LPG. This paper reports on numerical and experimental studies related to LPG fuel for a compression ignition engine. The numerical analysis is conducted to study the combustion chamber shape with CATIA and to analyze the spray and fluid behaviors with FLUENT for diesel and LPG (n-butane 100%) fuels. In one experimental study, a constant volume chamber is used to observe the spray formation for the chamber pressure 0 to 3MPa and to analyze the flame process, P-V diagram, heat release rate and emissions through the combustion of LPG fuel with the cetane additive DTBP (Di-tert-butyl peroxide) 5 to 15 wt% at 25MPa of fuel injection pressure. In engine bench tests, experiments were performed to find the optimum injection timing, lambda, COV and emissions for the LPG fuel with the cetane additive DTBP 5 to 15 wt% at 25MPa fuel injection pressure and 1500 rpm. The penetration distance of LPG (n-butane 100%) was shorter than that of diesel fuel and LPG was sensitive to the chamber pressure. The ignition delay was in inverse proportion to the ambient pressure linearly. In the engine bench tests, the optimum injection timing of the test engine to the LPG fuel with DTBP 15 wt% was about BTDC 12° CA at all loads and 1500 rpm. An increasing of DTBP blending ratio caused the promotion of flame and fast burn and this lead to reduce HC and CO emissions, on the other hand, to increase NOx and CO2 emissions.Copyright


International Journal of Automotive Technology | 2014

Urea-SCR system optimization with various combinations of mixer types and decomposition pipe lengths

Yong-Seok Cho; Seang-Wock Lee; Woongchul Choi; Y. B. Yoon


International Journal of Hydrogen Energy | 2012

Characterization of HCNG combustion and emission characteristics in a constant volume chamber with a single and a dual spark plug configuration

Seang-Wock Lee; Woongchul Choi; Yong-Seok Cho


Journal of Mechanical Science and Technology | 2011

Combustion and emission characteristics of HCNG in a constant volume chamber

Seang-Wock Lee; Han-Seung Lee; Young-Joon Park; Yong-Seok Cho


Journal of Mechanical Science and Technology | 2008

A study on characteristics and control strategies of cold start operation for improvement of harmful exhaust emissions in SI engines

Duk-Sang Kim; Young-Joon Park; Seang-Wock Lee; Yong-Seok Cho


International Journal of Automotive Technology | 2010

Effect of cetane enhancer on spray and combustion characteristics of compressed ignition type LPG fuel

Seang-Wock Lee; Yong-Seok Cho; Doo-Sung Baik


International Journal of Automotive Technology | 2012

Combustion characteristics of LPG and biodiesel mixed fuel in two blending ratios under compression ignition in a constant volume chamber

Seang-Wock Lee; Yong-Seok Cho; Woongchul Choi; Jung-Sug Lee; Young-Su Park


International Journal of Automotive Technology | 2017

Nanoparticle emission characteristics and reduction strategies by boost pressure control and injection strategies in a passenger diesel engine

Dong-Seop Eom; Seok-Ho Kang; Seang-Wock Lee


Journal of Mechanical Science and Technology | 2016

An experimental study on spray and combustion characteristics based on fuel temperature of direct injection bio-ethanol-gasoline blending fuel

Gi-Young Park; Seok-Ho Kang; Seang-Wock Lee

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