Control strategy using variable valve actuation to reduce particulate emission and improve driveability during transient operation of a turbocharged diesel engine

An internal combustion engine comprising:

• an intake system through which charge air is delivered to an intake manifold of the engine, including a turbocharger that comprises a compressor operated by exhaust gases from the engine for delivering compressed charge air into the intake manifold;
• exhaust valves that are normally closed but open to allow the exhaust gases to exit combustion chambers of the engine;
• a control for controlling the opening of the exhaust valves in relation to an engine operating cycle and for controlling fueling of the engine in relation to the engine operating cycle;
• wherein, in response to initiation of transient operation of the engine, the control increasingly retards exhaust valve opening in relation to the engine operating cycle to cause the turbocharger to increase pressure in the intake manifold and increases engine fueling in relation to the increased pressure in the intake manifold.