Browse Publications Technical Papers 2020-37-0016
2020-06-23

Assessing the Engine-Out Pollutant Emissions of a S.I. Engine for Hybrid Powertrain Applications 2020-37-0016

Car manufacturers are introducing more and more hybrid powertrains in order to reach CO2 emissions targets and answer increasingly stringent pollutant emission regulations such as unburned hydrocarbons (HC), nitrogen oxides (NOx), carbon monoxide (CO) and particulate matter. The addition of an electric engine to a thermal engine introduces an additional degree of freedom in the energy management of the powertrain since two energy sources are available. Thus, the energy management system must also account for regulated pollutant emissions when devising an optimal energy management strategy to avoid a pollutant emission increase due to CO2 only driven optimisation. It is therefore necessary to model the influence of thermal engine operating conditions such as load and speed on these emissions to evaluate their concentration in the exhaust gases. This study presents an empiric modelling approach based on an extensive parametric study using a spark-ignition port-injection four-cylinder engine. Such a model intend to be used in the context of hybrid powertrain optimization. In order to reduce the computing costs required by ECU (Engine Control Unit), the number of parameters in the mathematical expressions have been reduced based on a physical approach of the combustion process inside the engine.The experimental results are used to derive engine-out emission models for each regulated pollutant (NO, HC, CO) as a function of the engine operating parameters such as engine load and speed, equivalence ratio, spark advance. The proposed models provide accurate predictions over a large range of engine operating conditions. The adequate accuracy and low computational burden of the method are promising in the context of hybrid powertrains optimisation with a focus on pollutant emissions and overall fuel consumption.

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