Gm Global Technolgoy Operations, Inc.

Mirco De Marco

Davide Di Nunno

Eugenio Manta

Luca Trabucchi

Pierfrancesco De Giovanni

Methods for protecting turbochargers of engine systems include determining a speed gradient of the turbocharger and implementing a turbocharger speed protection action if the determined speed gradient is above a speed gradient threshold. Implementing a protection action comprises limiting engine torque, engine speed, vehicle speed, and/or fuel injection to the engine. The method can further include determining a cold start condition prior to determining the speed gradient of the turbocharger. A cold start condition can be determined based on ambient temperature, engine oil temperature, or engine coolant temperature. The method can further include, subsequent to implementing the turbocharger speed protection action, disabling the turbocharger speed protection action when a subsequently determined turbocharger speed gradient is below the speed gradient threshold. Systems for implementing the methods are also disclosed.

Turbocharger protection systems and methods

A roller tappet for a fuel unit pump of an internal combustion engine is provided with a roller tappet bore for inserting the roller tappet within the internal combustion engine. The roller tappet includes a roller tappet body having a body longitudinal axis for connecting the roller tappet to a reciprocating element of the fuel unit pump. A cam roller contacts a cam lobe of a rotatable shaft of the internal combustion engine. The cam roller is rotatably mounted to the roller tappet body around a cam roller rotation axis. The external surface of the roller tappet body is configured to allow tilting of the roller tappet within the roller tappet bore for aligning the roller tappet with respect to the cam lobe of the rotatable shaft.

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Grugliasco, Italy

Mirco De Marco