Real Driving Emissions—Conception of a Data-Driven Calibration Methodology for Hybrid Powertrains Combining Statistical Analysis and Virtual Calibration Platforms

Sascha Krysmon, Frank Dorscheidt, Johannes Claßen, Marc Düzgün and Stefan Pischinger
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Sascha Krysmon: Institute for Combustion Engines, RWTH Aachen University, 52074 Aachen, Germany
Frank Dorscheidt: Institute for Combustion Engines, RWTH Aachen University, 52074 Aachen, Germany
Johannes Claßen: Institute for Combustion Engines, RWTH Aachen University, 52074 Aachen, Germany
Marc Düzgün: Institute for Combustion Engines, RWTH Aachen University, 52074 Aachen, Germany
Stefan Pischinger: Institute for Combustion Engines, RWTH Aachen University, 52074 Aachen, Germany

Energies, 2021, vol. 14, issue 16, 1-27

Abstract: The combination of different propulsion and energy storage systems for hybrid vehicles is changing the focus in the field of powertrain calibration. Shorter time-to-market as well as stricter legal requirements regarding the validation of Real Driving Emissions (RDE) require the adaptation of current procedures and the implementation of new technologies in the powertrain development process. In order to achieve highest efficiencies and lowest pollutant emissions at the same time, the layout and calibration of the control strategies for the powertrain and the exhaust gas aftertreatment system must be precisely matched. An optimal operating strategy must take into account possible trade-offs in fuel consumption and emission levels, both under highly dynamic engine operation and under extended environmental operating conditions. To achieve this with a high degree of statistical certainty, the combination of advanced methods and the use of virtual test benches offers significant potential. An approach for such a combination is presented in this paper. Together with a Hardware-in-the-Loop (HiL) test bench, the novel methodology enables a targeted calibration process, specifically designed to address calibration challenges of hybridized powertrains. Virtual tests executed on a HiL test bench are used to efficiently generate data characterizing the behavior of the system under various conditions with a statistically based evaluation identifying white spots in measurement data, used for calibration and emission validation. In addition, critical sequences are identified in terms of emission intensity, fuel consumption or component conditions. Dedicated test scenarios are generated and applied on the HiL test bench, which take into account the state of the system and are adjusted depending on it. The example of one emission calibration use case is used to illustrate the benefits of using a HiL platform, which achieves approximately 20% reduction in calibration time by only showing differences of less than 2% for fuel consumption and emission levels compared to real vehicle tests.

Keywords: RDE; Real Driving Emissions; emissions calibration; virtual calibration; test procedures; validation methodology; statistical safety; strategy optimization; test cycles; cycle generation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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