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A Study on Control Logic Design for Power Seat

Hyundai Motor Co.-Misun Kwon, Taehoon Lee, Sangdo Park
Published 2019-04-02 by SAE International in United States
The large luxury sedan seat has a 22-way Movement. It offers a wide range of adjustments to enhance passenger comfort performance while it has many constraints on movement in constrained indoor space. In addition, the power seat is operated by a motor, which makes it difficult for the user to determine the amount of adjustment, unlike determining the amount of adjustment by the power and feel of a person, such as manual seat adjustment. IMS, one-touch mode, is also constrained by parameters such as indoor space package, user's lifestyle, etc. during function playback. This paper aims to design the seat control logic to achieve the best seat comfort while satisfying each constraint.The results of this study are as follows. Increase robustness of power seat control logic.Provide optimal adjustments and comfort at each location.Offer differentiated custom control and seating modes for each seat.Improve customer satisfaction and quality by upgrading software.
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Numerical Parametric Study of a Six-Stroke Gasoline Compression Ignition (GCI) Engine Combustion

Hyundai Motor Co.-Kyoung-Pyo Ha
Michigan Technological University-Oudumbar Rajput, Youngchul Ra
Published 2019-04-02 by SAE International in United States
Numerical investigation of engine performance and emissions of a six-stroke gasoline compression ignition (GCI) engine combustion at low load conditions is presented. In order to identify the effects of additional two strokes of the six-stroke engine cycle on the thermal and chemical conditions of charge mixtures, an in-house multi-dimensional CFD code coupled with high fidelity physical sub-models along with the Chemkin library was employed. The combustion and emissions were calculated using a reduced chemical kinetics mechanism for a 14-component gasoline surrogate fuel. Two power strokes per cycle were achieved using multiple injections during compression strokes.Parametric variations of injection strategy viz., individual injection timing for both the power strokes and the split ratio that enable the control of combustion phasing of both the power strokes were explored. The computational results suggest that the operability limit of GCI combustion can be effectively expanded by controlling the mixture thermodynamic conditions and achieving optimum mixture stratification. It was uniquely found that the charge mixtures could burn in the mixing-controlled mode during the second power stroke with the injection timing…
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Synergies of Cooled External EGR, Water Injection, Miller Valve Events and Cylinder Deactivation for the Improvement of Fuel Economy on a Turbocharged-GDI Engine; Part 1, Engine Simulation

Hyundai Motor Co.-Myungsik Choi, Young-Hong Kwak
BorgWarner Inc.-Jerry Song, Daniel Gajowski
Published 2019-04-02 by SAE International in United States
As CO2 legislation tightens, the next generation of turbocharged gasoline engines must meet stricter emissions targets combined with increased fuel efficiency standards. Promising technologies under consideration are: Miller Cycle via late intake valve closing (LIVC), low pressure loop cooled exhaust gas recirculation (LPL EGR), port water injection (PWI), and cylinder deactivation (CDA). While these efficiency improving options are well-understood individually, in this study we directly compare them to each other on the same engine at a range of operating conditions and over a range of compression ratios (CR). For this purpose we undertake a comprehensive simulation of the above technology options using a GT-Power model of the engine with a kinetics based knock combustion sub-model to optimize the fuel efficiency, taking into account the total in-cylinder dilution effects, due to internal and external EGR, on the combustion. Based on a carefully designed design of experiments (DOE) our results indicate a potential CO2 improvement of up to 7% at part load conditions compared to the base engine without the above mentioned technologies while limiting the loss…
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In-Gear Slip Control Strategy of Dry-Clutch Systems Using a Sliding Mode Control

Hyundai Motor Co.-Jinsung Kim, Juhyun Nam
Published 2019-04-02 by SAE International in United States
This paper proposes a clutch control strategy during in-gear driving situations for Dual Clutch Transmissions (DCTs). The clutch is intentionally controlled to make small amount of a slip to identify the torque transfer capacity. The control objective of this phase is to ensure the clutch slip fairly remaining the specified value. To achieve this, the micro-slip controller is designed based on sliding mode control theory. Experimental verifications performed on onboard control system of the DCT equipped vehicle demonstrate that the proposed controller good tracking performance of the desired slip speed.
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Development of Adaptive Powertrain Control Utilizing ADAS and GPS

Hyundai Motor Co.-Sejun Kim
Hyundai-Kia America Technical Center Inc.-Jason H. Lee, Kwangwoo Jeong, Jaihyun Lee, Sanghoon Yoo, Byungho Lee, Jinho Ha
Published 2019-04-02 by SAE International in United States
This paper introduces the advancement of Engine Idle Stop-and-Go (ISG, also known as Auto Engine Stop-Start) and Neutral Coasting Control (NCC) with utilizing Advanced Driver Assistance System (ADAS) and GPS. The ISG and the In-Neutral Coasting (also known as Sailing or Gliding) have been widely implemented in recent vehicles for improving their fuel economy. However, many drivers find them somewhat disturbing because they basically change behaviors of their cars from what they used to. This annoyance discourages usages of those functions and eventually undermines their benefit of fuel saving. In order to mitigate the problem, new ISG and NCC algorithms are proposed. As opposed to the conventional logics that rely only on driver’s pedal action, the new algorithms determine whether or not to enable those functions for the given driving condition, based on the traffic information obtained using ADAS sensors and the location data from GPS and navigation map. With the ADAS module, the movement of a vehicle ahead is continuously monitored, and driver’s reaction to the movement is predicted and reflected in controlling ISG…
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Direct Coating Technology for Metallic Paint Replacement

Hyundai Motor Co.-Amanda Nummy
Published 2019-04-02 by SAE International in United States
Direct Coating is a new processing technique which applies a single-layer polyurethane coating directly to a plastic part within a 2-shot molding cycle. The advantages of Direct Coating over traditional paint are improved surface quality, scratch resistance, and cost-effective processing. This concept has been previously showcased in high-gloss piano black with the simple geometry of the exterior door garnish. In this paper, the capabilities of Direct Coating are expanded to include metallic pigments and complex geometries for interior trim. For this development project, the Hyundai Sonata center fascia was selected as the target application due to the complex flow geometry around the bezel, and the high occurrence of customer contact, necessitating scratch and chemical resistance. Results of plaque-level testing showed that the coating material passed all requirements, including interior chemical resistance and scratch resistance. The work outlined in this paper sought to evaluate the appearance of surface quality, as well as knit and flow lines of the coating material. A 2-shot molding prototype tool was made, and part molding trials were conducted using metallic pigmented…
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Synergies of Cooled External EGR, Water Injection, Miller Valve Events and Cylinder Deactivation for the Improvement of Fuel Economy on a Turbocharged-GDI Engine; Part 2, Engine Testing

Hyundai Motor Co.-Myungsik Choi, Young-Hong Kwak
BorgWarner Inc.-David B. Roth, Dan Jakiela, Jerry Song
Published 2019-04-02 by SAE International in United States
As CO2 legislation tightens, the next generation of turbocharged gasoline engines must meet stricter emissions targets combined with increased fuel efficiency standards. Recent studies have shown that the following technologies offer significant improvements to the efficiency of turbocharged GDI engines: Miller Cycle via late intake valve closing (LIVC), low pressure loop cooled EGR (LPL EGR), port water injection (PWI), and cylinder deactivation (CDA). While these efficiency-improving technologies are individually well-understood, in this study we directly compare these technologies to each other on the same engine at a range of operating conditions and over a range of compression ratios (CR). The technologies tested are applied to a boosted and direct injected (DI) gasoline engine and evaluated both individually and combined. The results show for the test engine, given all of the technologies available, what the best combinations are for all tested speeds and loads, at each compression ratio studied.
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Prediction of In-Cylinder Pressure for Light-Duty Diesel Engines

Hyundai Motor Co.-Seungha Lee, Kyoungchan Han
Seoul National University-Youngbok Lee, Kyoungdoug Min
Published 2019-04-02 by SAE International in United States
In recent years, emission regulations have been getting increasingly strict. In the development of engines that comply with these regulations, in-cylinder pressure plays a fundamental role, as it is necessary to analyze combustion characteristics and control combustion-related parameters. The analysis of in-cylinder pressure data enables the modelling of exhaust emissions in which characteristic temperature can be derived from the in-cylinder pressure, and the pressure can be used for other investigations, such as optimizing efficiency and emissions through controlling combustion.Therefore, a piezoelectric pressure sensor to measure in-cylinder pressure is an essential element in the engine research field. However, it is difficult to practice the installation of this pressure sensor on all engines and on-road vehicles owing to cost issues. Therefore, there have been several studies aiming to estimate the in-cylinder pressure using only the data available from the Engine Control Unit (ECU) without an additional pressure sensor.An in-cylinder pressure prediction model for conventional light-duty diesel engines had been established by authors and described in this paper. First, the pressure during the compression stroke was estimated using…
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Development of the Wireless Power Transfer Technology for a Sliding Door

Hyundai Motor Co.-MyoungKwon Je, Jae Kyu Lee, Jae Hong Choi, Hyung In Yun, KeunSoo Kim
Published 2019-04-02 by SAE International in United States
The sliding door’s movement is 3-dimensional unlike the conventional door. So the electric power and signal are exchanged via the long ‘Power Cable’. It has a quite complex structure in order to be suitable to connect the vehicle’s body and the sliding door even during it’s moving. As the result, it is more expensive than conventional door’s one and the quality could not be guaranteed easily. In this paper, I have developed new technology which could transfer electric power by ‘wireless transfer’ in order to resolve the problem from using ‘Power cable’. I would propose the proper structure to transfer the electric power at any position of the sliding door without any physical connection. To transfer the electric power which drives the window regulator and the actuators in door, I have applied the ‘inductive coupling’ system. And in order to decide the engineering properties - such as the dimensions of the core, the values of the electric elements and the frequency of the transferred electricity - a myriad of computer analysis and experiments under various…
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ABC’s of Seat Comfort: A Historical Perspective

Hyundai Motor Co.-Scott Allen Ziolek
Published 2019-04-02 by SAE International in United States
Although subjective measurements are critical for qualifying seat comfort in terms of good or bad, objective measurements are the basis for quantifying these differences and ultimately controlling seat comfort performance through engineering design specs, targets, and/or guidelines. Many objective automotive seat comfort tools and techniques used today are based on methods derived in the past. This paper examines the engineering problems and solutions that make these historical influences relevant today. Particular focus is given to design considerations for the A-surface, B-surface, and the compressed surface of the seating system.
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