Efficiency 3 Gasoline 3 Gasoline engines Combustion 2 Combustion stability 2 Cylinder pressure sensor 2 Diesel engines 2 Engine cylinders 2 Exhaust gas recirculation 2 Gases 2 Higher efficiency 2 Hybrid gasoline engine 2 In-cylinder pressure sensor 2 In-cylinder pressures 2 Open-loop 2 Pressure sensors 2 Robust control 2 Stability 2 Stability control 2 Stability limit 2 combustion stability 2 exhaust gas recirculation 2 hybrid gasoline engine 2 in-cylinder pressure sensor 2 Boost pressure 1 Carbon 1 Carbon-free 1 Carbon-free fuel 1 Downsizing 1 Engines 1