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Manage and Optimize Power System to Maximize Steering Assist and Stop-Start Availability
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Auto stop-start (Engine stop-start, ESS) has become a widely used feature to reduce fuel consumption and CO2 emissions particularly in congested cities. Typically, vehicles equipped with such systems include two DC power sources that are coupled in parallel: a primary and a secondary power source. The primary power source supplies energy to the starter to crank the engine, while the secondary power source supplies energy to the rest of the vehicle electric loads. During an auto-stop event, a controllable switch decouples the two power sources. Moreover, operating current, voltage and the State of Charge (SOC) are monitored to ensure enough energy for the next auto-start event. When any of these operating parameters are below the threshold values, the controllable switch opens to isolate the two batteries and then the engine is automatically started.
This paper introduces a strategy to control the power usage of the Electric Power Assist Steering (EPAS) system for enhanced stop-start availability, optimal steering/EPAS assist, maximum fuel economy savings and minimum CO2 emissions. The algorithm predicts the energy demand by the customer and determines the next engine state based on the above mentioned criteria. The power system architecture uses a Lead Acid battery (Lead Acid, AGM and/or Enhanced) in parallel to a Lithium-ion (Li-ion) battery. Such architecture combines the advantages of the two technologies and supplies the required vehicle power over a wider operating range of ambient conditions. Moreover, the Li-Ion has voltage characteristics that are similar to the lead acid battery, and hence there is no need for any adjustments between the two power supplies. Measured data and results assure the ability of the introduced strategy to optimize between engine auto-stop/start and the EPAS assist.
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CitationKhafagy, H., "Manage and Optimize Power System to Maximize Steering Assist and Stop-Start Availability," SAE Technical Paper 2017-01-1176, 2017, https://doi.org/10.4271/2017-01-1176.
Data Sets - Support Documents
|Unnamed Dataset 1|
- Khafagy Hafiz , Pebley Kirk , Bouse William and Deljevic Zeljko APPARATUS AND METHOD TO MAXIMIZE VEHICLE FUNCTIONALITY AND FUEL ECONOMY WITH IMPROVED DRIVABILITY DURING ENGINE AUTO STOP-START OPERATIONS August 11 2016
- Hollingsworth Noel , Meyer Jason , McGee Ryan , Doering Jeffrey , Konidaris George , and Kaelbling Leslie Optimizing a Start-Stop Controller Using Policy Search Proceedings of the Twenty-Sixth Annual Conference on Innovative Applications of Artificial Intelligence
- Butcher , R. Spotting the Difference - Measuring Worthwhile Lubricant Related CO2 Benefits SAE Technical Paper 2016-01-0890 2016 10.4271/2016-01-0890
- Lemazurier , L. , Shidore , N. , Kim , N. , Moawad , A. et al. Impact of Advanced Engine and Powertrain Technologies on Engine Operation and Fuel Consumption for Future Vehicles SAE Technical Paper 2015-01-0978 2015 10.4271/2015-01-0978
- Cole Garth A. , Adler Thomas J. A MODEL OF THE U.S. START-STOP VEHICLE MARKET Association for European Transport and Contributors 2012
- Athani , G. , Dongare , K. , and Gavarraju , S. An Innovative Control Algorithm for Engine Stop/Start for Vehicles with Manual Transmission, Derived through Analysis of On-Road Test Data SAE Technical Paper 2016-01-0623 2016 10.4271/2016-01-0623
- Damman Anja , Perer Jan , Burgio Gilberto & Hulten Johan Stability Analysis for Controlled EPAS-Steering Feel Control by a Reference Generator Concept Ford Research and Advanced Engineering Technical Report 18 November 2005
- Wang Xiaoyong , McGee Ryan & Kuang Ming Powertrain Coordination for Stop-Start Ford Research and Advanced Engineering Technical Report 12 March 2012