Berbagai modifikasi mesin dilakukan dengan tujuan meningkatkan performa kendaraan bermotor. Peningkatan yang paling banyak cara memperbaiki tingkat efisiensi volumetrik campuran bahan bakar dan udara masuk ke dalam silinder motor. Dengan terhalangnya aliran dari arah depan kendaraan, maka perlu dikaji seberapa besar pengaruh sudut intake manifold mengalirkan motor terhadap daya, torsi, kecepeta...

Flexible fuel vehicles (FFVs) can operate on a blend of ethanol and gasoline in any volumetric concentration of up to 85% ethanol (93% in Brazil). Existing FFVs rely on ethanol sensor installed in the vehicle fueling system, or on the ethanoldependent air-to-fuel ratio (AFR) estimated via an exhaust gas oxygen (EGO) or λ sensor. The EGO-based ethanol detection is desirable from cost and mainten...

Emissions from modern SI-engines are reduced by a three way catalyst. However if there are leaks in the exhaust system before the catalyst emissions increase for two reasons. First the untreated emissions leak out. Second which is worse, due to waves in the exhaust system, oxygen leaks into the manifold and causes an oxygen sensor offset. The result is increased emissions as the air/fuel contro...

The paper extends a mean value model of a parallel turbocharged internal combustion engine with a crank angle resolved cylinder model. The result is a 0D engine model that includes the pulsating flow from the intake and exhaust valves. The model captures variations in turbo speed and pressure, and therefore variations in the compressor operating point, during an engine cycle. The model is used ...