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Using Vehicle Specifications to Gain Insights into Different Automotive Market Requirements

Mahindra & Mahindra, Ltd.-Lemuel Paulraj, Saravanan Muthiah
  • Technical Paper
  • 2020-01-1283
To be published on 2020-04-14 by SAE International in United States
Determination of vehicle specifications (for example, powertrain sizing) is one of the fundamental steps in any new vehicle development process. The vehicle system engineer needs to select an optimum combination of vehicle, engine and transmission characteristics based on the product requirements received from Product Planning (PP) and Marketing teams during concept phase of any vehicle program. This process is generally iterative and requires subject matter expertise. For example, accurate powertrain sizing is essential to meet the required fuel economy (FE), performance and emission targets for different vehicle configurations. This paper analyzes existing vehicle specifications (Passenger Cars/SUVs - Gasoline/Diesel) in different automotive markets (India, Europe, US, Japan) and aims to determine underlying trends across them. Scatter band analysis is carried out for specifications such as vehicle kerb weight (WT), vehicle length (L), vehicle width (W), vehicle height (H), footprint area (FPA), engine cubic capacity (CC) and engine power (P). CC/WT vs FE, CC/FPA vs FE, P/WT vs FE, FPA/(LXW), CC/(FPAXH), FPAXH and WXH trends are analyzed amongst others. It is interesting to note that similarities exist…
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Sound Quality Development Using Psychoacoustic Parameters with Special Focus on Powertrain Noise

Geely Powertrain Research Institute-Garanto Victor, Geng Zhirong, Hu Junfeng, Deng Xiaolong, Yang Wanli, Wang Hao
  • Technical Paper
  • 2020-01-5000
Published 2020-01-24 by SAE International in United States
This research uses vehicle interior noise at the driver position during full load acceleration to objectively define the resultant Sound Quality (SQ) of the vehicle analyzed by focusing on powertrain noise. A calculation method is developed to rank vehicles in order of customer preference (Sound Rank) and provide a subjective evaluation score for different error states a vehicle can encounter. In order to calculate these two scores, a pleasantness parameter is obtained using standard calculated psychoacoustic parameters with different weighting scores depending on their importance toward the preference ranking. Then pleasantness is correlated with jury test results and subjective evaluations.The results obtained show that the model is capable of quantifying the vehicle SQ during the vehicle development process and position a vehicle within a two-dimensional (2D) powerful-refined plot. This is achieved with the help of psychoacoustic parameter scatter bands. The model provides an objective tool to quantify and verify the resultant SQ to help meet and optimize Noise, Vibration, and Harshness (NVH) targets.
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Brake Pedal felling correlation with female shoe and feet position

(General Motors do Brasil)-Giorgia Buganza, Fernando Utyike, Fabio Raposo, Eduardo Godinho
  • Technical Paper
  • 2019-36-0015
Published 2020-01-13 by SAE International in United States
The female market share has increase every year, for some segments we have a majority of female buyers. Working with this tendency we work to understand the impact and the dislikes that we may be facing in the near future due to the costumer habits, and also understand what can be done to improve this relationship.This paper will discuss the feeling correlation between the foot position, heel point, drivers knee and the feeling of the brake pedal.We need to consider the difference between different shoe sole design and the impact on the point of force apply and angles resulting a costumer perception of the brake feeling of the vehicle.Based on Market research, math model studies and simulation, experiments done at the vehicle and measurements considering different situations we will show that the felling can be affected using different shoes and the brake performance perception can be also affected.We conclude the paper with the comments on what should be consider guaranteeing the best driver experience feeling.
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Adaptive Design of Driver Steering Override Characteristics for LKAS

JTEKT Corporation-Yosuke Nishimura, Atsushi Ishihara, Kazuya Ando
Tongji University-Quyi Liu, Hui Chen, Jiachen Chen
Published 2019-11-04 by SAE International in United States
Lane Keeping Assistance System (LKAS) is a typical lateral driver assistance system with low acceptance. One of the main reasons is that fixed parameters cannot satisfy individual differences. So LKAS adaptive to driver characteristics needs to be designed. Driver Steering Override (DSO) process is an important process of LKAS. It happens when contradiction between driver’s intention and system behavior occurs. As feeling of overriding will affect the overall experience of using LKAS, the design of DSO characteristics is worthy of attention. This research provided an adaptive design scheme aiming at DSO characteristics for LKAS by building Driver Preference Model (DPM) based on simulator test data from preliminary experiments. The DPM was to represent the relationship between driver characteristics indices and driver preferred system characteristics indices. So that new drivers’ preference can be predicted by DPM based on their own daily driving data with LKAS switched off. The inputs of DPMs are 27 lane changing driver characteristics indices which were extracted based on natural lane changing data. Principal Component Analysis (PCA) and correlation analysis were used…
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Editorial

Autonomous Vehicle Engineering: December 2019

Editorial Director-Bill Visnic
  • Magazine Article
  • 19AVEP11_01
Published 2019-11-01 by SAE International in United States

After digesting some of the fascinating insights from surveys taken of automated-vehicle test riders - most of them first-timers - who participated in SAE International's Demo Days program (see pg. 31), you've got to conclude that the only thing predictable about the new-mobility landscape is its unpredictability.

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EDITORIAL: Engineering lapses test brand loyalty

Automotive Engineering: November/December 2019

Editor-in-Chief-Lindsay Brooke
  • Magazine Article
  • 19AUTP11_05
Published 2019-11-01 by SAE International in United States

“Today a bunch of idiot lights appeared in the minivan during my drive to work,” reported my spouse, Suzie, after she arrived home one evening last month. Sure enough, the cluster on our 2011 Honda Odyssey lit up like a Christmas tree when I turned on the ignition to investigate. The Check Engine light and two others were illuminated.

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Familiarity Breeds Respect

Autonomous Vehicle Engineering: December 2019

Bill Visnic
  • Magazine Article
  • 19AVEP11_08
Published 2019-11-01 by SAE International in United States

SAE surveyed participants in its recently concluded AV ride-along program. Their responses reinforce positive perceptions about the automated-driving experience.

If there's one takeaway from SAE International's groundbreaking Demo Days program that took place in various U.S. cities over 18 months, it's that everyday people who've had the opportunity to ride in an automated vehicle (AV) on real roads are the antithesis of Chaucer's familiar phrase, “Familiarity breeds contempt.”

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2019 Vehicle Technology Review

Automotive Engineering: April 2019

Paul Seredynski
  • Magazine Article
  • 19AUTP04_02
Published 2019-04-01 by SAE International in United States

Reviewing the latest tech applications in the automotive space and the trends they're serving.

With massive shifts looming in the automotive engineering space - the titanic trio of Autonomy, Mobility and Electrification (AME) - it's easy to forget that the pace of innovation continues unaltered in the here and now. We've reviewed the latest technologies on the newest OEM models and how they point to current trends in the automotive landscape. Though the AME macro trends represent the majority investment in the automotive space, and work on traditional engineering projects including new powertrains continues, small features that resonate often serve as a guideposts to what's next.

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J.D. Power launches new vehicle-engineering award at SAE's WCX 2019

Automotive Engineering: April 2019

Bill Visnic
  • Magazine Article
  • 19AUTP04_03
Published 2019-04-01 by SAE International in United States

Globally-respected automotive analytics firm J.D. Power recognizes outstanding vehicle-integration engineering with two new annual awards.

Long known for its groundbreaking surveys measuring automotive customer satisfaction, quality and dependability-and presenting corresponding awards to top-achieving OEMs-marketing information and analytics firm J.D. Power is launching two new engineering-related awards for development teams responsible for each year's best all-new vehicle and best redesigned vehicle.

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China's NIO making EV battery swapping work

Automotive Engineering: February 2019

Sebastian Blanco
  • Magazine Article
  • 19AUTP02_13
Published 2019-02-01 by SAE International in United States

Emergent electric-vehicle automaker NIO believes battery swapping makes sense for EVs and the company's customers almost universally agree. In front of 10,000 guests at the 2018 NIO Day in mid-December, company founder and CEO William Li announced that 9,726 units of the company's first vehicle, the ES8 SVU, had been delivered. And more than 95% of those buyers chose to lease the battery, which is only possible with battery packs designed to be swapped out for recharging.

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