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Analysis of Drivability Influence on Tailpipe Emissions by Means of Engine-in-the-Loop Test Benches

FEV Europe GmbH-Stefan Tegelkamp, Michael Görgen, Martin Nijs, Johannes Scharf
RWTH Aachen University-Christian Heusch, Daniel Guse, Frank Dorscheidt, Johannes Claßen, Timm Fahrbach, Stefan Pischinger
  • Technical Paper
  • 2020-01-0373
To be published on 2020-04-14 by SAE International in United States
Due to increasing environmental awareness, standards for pollutant and CO2 emission legislations are getting stricter in most markets around the world. In important markets such as Europe, also the emissions during driving on real roads, the so called “Real Driving Emissions” (RDE), are now a part of the type approval process for passenger cars. In addition to the hybridization and electrification of vehicles, the complexity and degrees of freedom of conventional powertrains with internal combustion engines are continuing to increase in order to comply with stricter exhaust emission standards. Besides the different requirements placed on vehicle emissions, the drivability capabilities of passenger vehicles desired by the costumers, varies within markets. Since the interactions between different hardware and software systems of the powertrain strongly influence the drivability characteristics of a vehicle, a high degree of maturity of prototype vehicles is required to execute drivability calibration tasks. Hence, these tasks are generally conducted in late phases of the vehicle development process. The assessment of the influence of drivability calibration on the vehicle’s tailpipe emissions is complex. Since…
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Objectified Evaluation and Classification of Passenger Vehicles Longitudinal Drivability Capabilities in Automated Load Change Drive Maneuvers at Engine-in-the-Loop Test Benches

FEV Europe GmbH-Stefan Tegelkamp, Martin Nijs, Johannes Scharf
RWTH Aachen University-Daniel Guse, Christian Heusch, Serge Klein, Timm Fahrbach, Jakob Andert, Stefan Pischinger
  • Technical Paper
  • 2020-01-0245
To be published on 2020-04-14 by SAE International in United States
The growing number of passenger car variants and derivatives in all global markets, their high order of software differentiability caused by regionally different legislative regulations, as well as pronounced market-specific customer expectations require a continuous optimization of the entire vehicle development process. Additionally, the continued increasingly stringent emission standards lead to considerable increases in powertrain hardware and control complexity. Also, efforts to achieve global market and brand specific multistep adjustable drivability characteristics as unique selling proposition, rapidly increase the scope for calibration and testing tasks during the development of the powertrain control units. The resulting extent of interdependencies between the drivability calibration and other development and calibration tasks require frontloading of development tasks. Usually, drivability calibration takes place towards the end of the vehicle development program as soon as a sufficient level of product maturity is achieved. Hence, for streamlining the entire development process, various powertrain engineering tasks have to be shifted from the overall vehicle level to component conception phases. In this context, highly dynamic “Hardware-in-the-Loop” (HiL) component test benches are the means of…
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Objectified Drivability Evaluation and Classification of Passenger Vehicles in Automated Longitudinal Vehicle Drive Maneuvers with Engine Load Changes

FEV Europe GmbH-Stefan Tegelkamp, Christopher Schmidt, Henning Roehrich, Martin Nijs, Johannes Scharf
RWTH Aachen University-Daniel Guse, Christian Heusch, Stefan Pischinger
Published 2019-04-02 by SAE International in United States
To achieve global market and brand specific drivability characteristics as unique selling proposition for the increasing number of passenger car derivatives, an objectified evaluation approach for the drivability capabilities of the various cars is required. Thereto, it is necessary to evaluate the influence of different engine concepts in various complex and interlinked powertrain topologies during engine load change maneuvers based on physical criteria. Such an objectification approach enables frontloading of drivability related engineering tasks by the execution of drivability development and calibration work within vehicle subcomponent-specific closed-loop real-time co-simulation environments in early phases of a vehicle development program. So far, drivability functionalities could be developed and calibrated only towards the end of a vehicle development program, when test vehicles with a sufficient level of product maturity became available. The resulting compaction and parallelization of the calibration work to meet the emissions, on-board diagnostics as well as the drivability requirements drastically reduces development costs and time.This article presents an objectified drivability evaluation and classification approach for passenger cars, which is based on physical criteria, developed at…
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