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A 2.0 l turbocharged gasoline engine with port injection and a comparable turbocharged gasoline engine with direct injection have been investigated on a test bench at Kaiserslautern Technical University. Both engines were driven with throttle-free load control by fully mechanically variable valve actuation (CVVL). The basic series-production turbocharged engine in this comparison is the version with direct injection without the fully variable valve train. The focuses of the fired tests were investigation of the fuel consumption at part load and of maximum torque behavior at low engine speeds at full load. In both engine modes, use of fully variable valve actuation shows improvements compared with the turbocharged engine versions without CVVL. Better turbocharger response enabled the torque behavior to be optimized.

A 2.0 l turbo charged gasoline engine with the mechanically fully variable mechanical valve train UniValve has been investigated on a test bed at the University of Kaiserslautern. First results of the mechanical behaviour, full load behaviour and fuel consumption at part load have been measured. These results are compared to the uncharged gasoline engine. In both cases the engines have been driven throttled and throttled free through the variable valve train. The dynamic behaviour of the turbocharger version has been investigated too. The only modification of the engine is the turbo charger, the valve train and the intake manifold hasn't been changed. The results have been compared with GT-Power simulations. The fuel consumption in the turbo charged mode at the map point 2,000 rpm/2bar could be improved up to 14 % through the throttle free load control vs. the throttled mode. The low end torque has been increased by 10 %.