Simulation-based emission analysis of electric turbocompounding in a 1.6L turbocharged camPro engine / MHM Muhammad, AMI Mamat and WSAIW Salim

With greenhouse gas emissions (GHG) being the culprit for global warming. Multiple pacts and accords have been made to push countries to increase their efforts towards reducing domestic GHG emissions. The transportation sector accounts for around 20% of global emissions, and new engine architecture needs to be developed for short and midterm solutions. Downsizing and turbocharging engines reduce friction and weight reducing brake-specific fuel consumption through waste heat recovery. The introduction of a low-pressure turbine (LPT) can further recover wasted heat in the exhaust gas by dual-stage turbocompounding. Multiple-stage turbines induce backpressure in the exhaust and can interfere with the combustion process. This can affect the emission of GHG. To investigate this effect, a 1D engine simulation using GT-Power was conducted. A 1.6 L CamPro CFE turbocharged engine was modeled and an electric turcompounding (ETC) unit was added. SI Wiebe combustion model was used to calculate the fraction of fuel burned overtime during the combustion cycle. Two temperature zones were used to further increase emission analysis. The brake-specific gas bsGasi emission was analysed to determine the emitted GHG. The result shows a maximum reduction of 28.8% in bsGasNOx, 6.9% in bsGasCO2, 7.2% in bsGasCO, and 9.9% in bsGasHC. Most of the improvements were located at the 3000 – 5000 rpm region with an average of 4% improvement overall. The implementation of ETC successfully reduces the GHG emission while improving the overall efficiency of the engine.