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Optimizing 12 Volt Start - Stop for Conventional Powertrains

Journal Article
2011-01-0699
ISSN: 1946-3936, e-ISSN: 1946-3944
Published April 12, 2011 by SAE International in United States
Optimizing 12 Volt Start - Stop for Conventional Powertrains
Sector:
Citation: Robinette, D. and Powell, M., "Optimizing 12 Volt Start - Stop for Conventional Powertrains," SAE Int. J. Engines 4(1):850-860, 2011, https://doi.org/10.4271/2011-01-0699.
Language: English

Abstract:

A cost effective means of achieving fuel economy gains in conventional powertrain is to utilize a 12 volt start/stop (S/S) system to turn the engine off and on during periods of vehicle idle. This paper presents powertrain integration issues specific to a 12 volt S/S system and the powertrain hardware content and calibration strategies required to execute a 12 volt S/S system for start ability, reduced noise and vibration (N&V) and vehicle launch. A correlated lumped parameter modeling methodology is used to determine engine startup profiles, starter hardware and intake cam park position requirements based upon vehicle level response to the startup event. Optimization of the engine startup is reported for a multitude of powertrain configurations, including transverse and longitudinal arrangements with manual, automatic and dual clutch transmissions. Details are provided on the level of hardware and calibration necessary to satisfy a set of prescribed performance metrics, particularly seat track vibration and smooth vehicle launch.