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A Study on Control Logic Design for Power Seat

Hyundai Motor Co.-Misun Kwon, Taehoon Lee, Sangdo Park
  • Technical Paper
  • 2019-01-0466
To be published on 2019-04-02 by SAE International in United States
The large luxury sedan seats have a maximum movement of 22 way, each of which offers wide moving ranges from 30mm to 260mm. Although the mechanism provides a wide range of adjustments to enhance passenger comfort performance, the seat’s operating range is the largest and widest out of all moving parts of the interior components, facing many constraints on its movement in the constrained interior space. In addition, the power seat is operated by a motor, which makes it difficult for users to determine the amount of adjustment, unlike the manual seat adjustment that allows users to decide the adjustment scope according to their power and feeling. IMS, one-touch mode, is also constrained by parameters such as indoor space package, user's lifestyle, etc. during function playback. In this regard, this paper aims to design the seat control logic to achieve the best seat comfort while satisfying each constraint. This paper discusses constraints of power seat movement through seat control logic and methods to devise robust design of control logic. The results of this study are…

Experimental PEM-Fuel Cell Range Extender System Operation and Parameter Influence Analysis

Vienna University of Technology-Johannes Höflinger, Peter Hofmann, Bernhard Geringer
  • Technical Paper
  • 2019-01-0378
To be published on 2019-04-02 by SAE International in United States
Fuel cells as alternative propulsion systems in vehicles can achieve higher driving ranges and shorter refueling times compared to pure battery-electric vehicles, while maintaining the local zero-emission status. However, to take advantage of pure battery electric travel, an externally rechargeable battery can be combined with a fuel cell range extender. As part of a project funded by the Austrian Research Promotion Agency (FFG), an efficient air supply system for a fuel cell range extender is being developed. To this end, a 25 kW PEM fuel cell system test bench was set up at the Institute for Powertrains and Automotive Technology (IFA) of the Vienna University of Technology. The different parameter influences of the test bench, in particular of the air supply system, were analyzed and evaluated in terms of stack/system efficiency and functionality. The control software of the test bench was specifically developed for the flexible operating parameter variation. All adjustable variables of the system (air ratio, stack temperature, pressure, etc.) were varied and evaluated at steady-state operating points. Likewise, the system was analyzed during…

Evaluation of Different ADAS Features in Vehicle Displays

Univ of Michigan-Dearborn-Pranove Bandi, Sang-Hwan Kim
Univ. of Michigan-Dearborn-Abhishek Mosalikanti
  • Technical Paper
  • 2019-01-1006
To be published on 2019-04-02 by SAE International in United States
With ever-rising automotive safety standards, automotive manufacturers have been pushing towards improving occupant safety and convenience by adding sophistication to vehicles using ADAS (Advanced Driver Assistance Systems). Recent developments in the industry have been towards adding additional display systems to work in collaboration with the aforementioned ADAS systems to educate the passengers on vehicle status and information. The current study presents the results of an experiment on driver performance including reaction time, eye-attention movement, mental workload, and subjective preference when different features of ADAS warnings (Forward Collision Warning) are displayed, including different locations (HDD (Head-Down Display) vs HUD (Head-Up Display)), modality of warning (text vs. pictographic), and a new concept that provides a dynamic birds eye view for warnings. Sixteen normal drivers drove a high-fidelity driving simulator integrated with display prototypes of the features. A full factorial between subject design was employed in the experiment. Independent variables were displayed as modality, location, and adjustability of the warnings with driver performance as the dependent variable including driver reaction time to the warning, EORT (Eyes-Off-Road-Time) during braking…

Vehicle cold start Mode fuel economy simulation model making methodology

Maruti Suzuki India Ltd-Parikshit Mehra, Amit Gautam
Maruti Suzuki India, Ltd.-Bhoopendra Singh
  • Technical Paper
  • 2019-01-0898
To be published on 2019-04-02 by SAE International in United States
The air pollution and global warming has become a major problem to the society. To counter this worldwide emission norms have become more stringent in recent times and shall continue to get further stringent in the next decade. From OEMs perspective with increased complexity, it has become a necessity to use simulation methods along with model based systems approach to deal with system level complexities and reduce model development time and cost to deal with the various regulatory requirements and customer needs. The simulation models must have good correlation with the actual test results and at the same time should be less complex, fast, and integrable with other vehicle function modelling. As the vehicle fuel economy is declared in cold start condition, the fuel economy simulation model of vehicle in cold start condition is required. The present paper describes a methodology to simulate the cold start fuel economy. The simulation methodology includes the engine heat balance equation, heat conduction through cylinder walls and heat convected by air. Based on the heat transferred and heat absorbed…

Analysis of Passive Low Power Phase Change Heat Dissipation Method for Electric Vehicle Motor

Suizhou-WUT Industry Research Institute-Gangfeng Tan
Wuhan Univ. of Technology-Shiping Huang, Yishi Wang, Jianjie Kuang, Jiakang Quan, Xiaofei Ma
  • Technical Paper
  • 2019-01-1256
To be published on 2019-04-02 by SAE International in United States
The electric vehicle motor is developing toward high power density, at the same time brings serious temperature rise problem, which affect the motor performance, efficiency, and useful life. Liquid cooling is usually used to solve the problem, but it’s energy consumption is large and the reliability is poor. In order to solve above problems, a heat dissipation method based on a heat pipe is proposed, and the heat pipe cold end is cooled by vehicle facing the wind. The purpose is to improve the reliability and energy efficiency of the motor thermal management system under the condition of ensuring the normal temperature of the motor. Firstly, the motor heating model is established to analyze the position of the high temperature region when the motor is working, and the influence of the motor speed and torque on the temperature rise of the motor. Then the heat transfer model between the motor winding and the heat pipe cold end is established, and the influence of the working condition change of the heat pipe hot and cold end…

Simulation Based Investigation of achieving Low Temperature Combustion with Methanol in a Direct Injected Compression Ignition Engine

Lund University-Erik Svensson, Sebastian Verhelst
  • Technical Paper
  • 2019-01-1152
To be published on 2019-04-02 by SAE International in United States
Low temperature combustion concepts used in compression ignition engines have shown to be able to produce simultaneous reduction of oxides of nitrogen and soot as well as generating higher gross indicated efficiencies compared to conventional diesel combustion. This is achieved by a combination of premixing, dilution and optimization of combustion phasing. Low temperature combustion can be complemented by moving away from fossil fuels in order to reduce the net output of CO2 emissions. Alternative fuels are preferably liquid and of sufficient energy density. As such methanol is proposed as a viable option. This paper reports the results from a simulation based investigation on a heavy-duty multi-cylinder direct injection compression ignition engine with standard compression ratio. The engine was simulated using two different fuels: methanol and gasoline with an octane number of 70. The primary objective of the study was to find the optimal engine settings which maximized the brake efficiency for the engine. A secondary objective was to find the optimal injection strategy and combustion mode that would result if the brake efficiency was targeted.…

A Visual Investigation of CFD-Predicted In-Cylinder Mechanisms that Control1st and 2nd Stage Ignition in Diesel Jets

Sandia National Laboratories-Mark Musculus
Univ of Wisconsin-Rolf Reitz
  • Technical Paper
  • 2019-01-0543
To be published on 2019-04-02 by SAE International in United States
The long-term goal of this work is to develop a conceptual model for multiple injections of diesel jets. The current work contributes to that effort by performing a detailed investigation into mechanisms that are predicted to control 1st and 2nd stage ignition in diesel jets. Here, two n-dodecane axi-symmetric jets, injected into air, are simulated. One jet is injected into 900K air, which produces a classic-burning jet with a negative ignition dwell, -dwell. The other is injected into 760K air. It produces a more volumetric-appearing burn and a positive ignition dwell, +dwell. The way fuel begins to burn for both cases is similar: very early reactions begin off-axis; reaction rates increase as reacting gases flow downstream; once beyond the point of complete fuel evaporation, 1st stage heat release (HR) transitions to 2nd stage as the HR zone starts passing through the premixed charge a second time and the rise in premixed burn spike forms. The chemical and thermodynamic environment surrounding the early-2nd stage reactants for each case are very distinct. The +dwell initial 2nd stage…

Efficient Method for Head-Up Display Image Compensation by Using Pre-Warping Method

Hyundai Mobis-Mijin Jeon, Youna Lee
Hyundai Motor Group-Iksoon LIM
  • Technical Paper
  • 2019-01-1008
To be published on 2019-04-02 by SAE International in United States
A Head-Up Display (HUD) is electrical device that provide virtual images in front of driver. Virtual images are consists of various driving information. Because HUD use optical system there exist image distortion with respect to image height and driver’s eye position. Image warping is the image correction method that makes a geometrical change on image to minimize image distortion. To minimize image distortion, HUD use optical data driven warping matrix for each image height. But even we applied data driven warping matrix, image distortion occurs due to manufacturing tolerances at inline. In this paper, we suggest pre-warping method to minimize image distortion about each height steps on HUD. We simulated 3 cases to compensate the differences from the inline HUD image (reference height) for pre-warping matrix (every step). By using proposed pre-warping method we reduce total image x displacement by 30%, y displacement by 40%.

Approximating Convective Boundary Conditions for Transient Thermal Simulations with Surrogate Models for Thermal Packaging Studies

Oakland Univ-Laila Guessous
ThermoAnalytics Inc.-Jon Rene Juszkiewicz
  • Technical Paper
  • 2019-01-0904
To be published on 2019-04-02 by SAE International in United States
The need for transient thermal simulations in vehicle packaging studies has grown rapidly in recent years. To date, the computational costs associated with the transient simulation of 3D conjugate heat transfer phenomena has prohibited the widespread use of full vehicle transient simulations. This paper presents results from a recent study that explored a method to circumvent the computational costs associated with long transient conjugate heat transfer simulations. The proposed method first segregates the thermal structural and fluid physics domains to take advantage of time scale differences. The two domains are then re-coupled to calculate a series of steady state conjugate heat transfer simulations at various vehicle speeds. The local convection terms are then used to construct a set surrogate models dependent on vehicle speed, that predict the local heat transfer coefficient and the local near wall fluid temperature. These surrogate models are then coupled to the thermal structural simulation to simulate the wall temperature history. Results from the transient conjugate heat transfer simulations of several vehicle test cycles were compared to simulations performed with the…

Modeling Fuel Tank Draining/Sloshing in a Typical Transiently Accelerating Vehicle using GT-SUITE for Reliable Tank Designing

Gamma Technologies LLC-Arpit Tiwari, Nils-Henning Framke
  • Technical Paper
  • 2019-01-1262
To be published on 2019-04-02 by SAE International in United States
Draining and fuel starvation prediction is of critical importance in designing and approving fuel tanks. Simulation of fluid dynamics to predict draining of a moving tank having multiple fuel compartments and multiple ports is, however, challenging. This is because the dynamics involve multiple fluids which follow distinct thermodynamics – compressible air at the top and nearly incompressible fuel below it. Moreover, for a typical vehicle accelerating transiently, the surface angle keeps changing which leads to dynamic fuel covering/uncovering of interior as well as outlet ports. Simulation of these effects often requires 3D multiphase solution, which is computationally expensive especially when it is required to model additional fluid systems such as fuel pipes and jet pumps. We present fast and efficient modeling and simulation of tank draining using the 0D/1D framework of GT-SUITE. The flexibility and robustness of the inbuilt flow solver allows accurate solution of the associated multiphase flow dynamics. Furthermore, the software is geometrically flexible to capture the surface angle variations (sloshing) of fuel moving in complicated 3D shaped tanks and allows for the…