Search Results

This study measures transient torque, smoke opacity and pumping-losses derived from in-cylinder pressure, as a function of Variable Geometry Turbocharger (VGT) vane position (derived through Engine Control Unit, ECU). Tests were conducted using a typical passenger car/light duty truck application turbo-charged common-rail diesel engine, of 14 configuration. The aim was to seek potential improvements in engine pumping-losses (and thus fuel economy) during full-load transients and at low engine speeds, due to opening of VGT vanes. The objective was to record engine performance (e.g. engine transient-torque, smoke opacity, fuel-demand, engine pressure-ratio etc.), under full-load operation, and at engine speeds of 900-1600 rpm. The effects of “slow” and “fast” transient manoeuvres were established (in a transient test facility) by performing four different acceleration rates (i.e. 2s, 5s, 10s and 20s).