This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Powertrain Metric to Assess Engine Stop Start Refinement
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 15, 2015 by SAE International in United States
Annotation ability available
Every automaker is looking for ways to improve the fuel economy of its vehicle fleet to meet the EPA greenhouse gas regulation, which translates into 2025 Corporate Averaged Fuel Economy of 54.5 mpg. Engine Stop Start technology will improve the fuel economy of the vehicle by shutting down the engine when the vehicle is stationary. While this is an established technology in Europe, it is beginning to gain momentum in North America, where NVH refinement is a stronger consideration. To utilize the fuel economy benefits of Stop Start technology in the North American market, the technology must be seamlessly incorporated into the vehicle.
This paper gives an overview of characterizing an auto start based on the features of a few Powertrain-system-level metrics. Following the fundamentals of NVH, (Source, Path and Receiver) the receiver touch points will be less perceptible to vibration, if the powertrain-system source is made smoother. Tangential components, which are functions of cylinder pressure and crank angle, are the dominant forces during auto start. Six powertrain-system-level metrics that will define an auto start are developed: engine ramp rate; engine jerk during initial combustion; engine flaring; vibration dose value from the active side of the engine mounts; starter engagement time based on battery voltage; and near field sound level measured 15 cm away from starter. This paper recommends that all of these metric values be reduced to obtain better customer subjective and objective ratings. This paper also correlates these powertrain-system metrics with driver tactile and audible sensory response points.
CitationSrinivasan, S., Orzechowski, J., and Schoenherr, M., "Powertrain Metric to Assess Engine Stop Start Refinement," SAE Technical Paper 2015-01-2186, 2015, https://doi.org/10.4271/2015-01-2186.
- Rainer Knorr Start/Stop system on the home straight ATZ 9 2011
- Wellmann , T. , Govindswamy , K. , and Tomazic , D. Integration of Engine Start/Stop Systems with Emphasis on NVH and Launch Behavior SAE Int. J. Engines 6 2 1368 1378 2013 10.4271/2013-01-1899
- DeBruin Luke A. Energy and Feasibility Analysis of Gasoline Engine Start/Stop Technology Thesis Ohio State University 2013
- Dr. Taraza Dinu Dynamics and Vibrations of Automotive Engines Course Pack Wayne State University 2007
- Liu , X. , Nahra , P. , and Strehlau , A. Extended Range Cam Phasing Effects on Engine Stop/Start Quality SAE Technical Paper 2014-01-1700 2014 10.4271/2014-01-1700
- Robinette , D. and Powell , M. Optimizing 12 Volt Start - Stop for Conventional Powertrains SAE Int. J. Engines 4 1 850 860 2011 10.4271/2011-01-0699
- SAE J1060 2000 Subjective Rating Scale For Evaluation Of Noise And Ride Comfort Characteristics Related To Motor Vehicle Tires