Caterpillar Inc.

Perkins Engines Company Limited

Ross Daniel Collins

Stuart P Smith

Martin George Constantine

Alistair James Dales

The present disclosure relates to improvements in turbocharger efficiency and more particularly to a method and system for estimating the efficiency loss of a turbocharger. The method comprises the steps of monitoring a plurality of operating parameters and determining a compressor exit temperature according to a first calibration map based on these operating parameters. An estimate of instantaneous turbocharger efficiency loss according to a second calibration map is then determined, based on the compressor exit temperature. The instantaneous turbocharger efficiency loss is used to determine an estimate of cumulative turbocharger efficiency loss during engine service. The estimate of cumulative turbocharger efficiency loss is compared with a first predetermined efficiency loss threshold and a first signal is generated if the first predetermined efficiency loss threshold is exceeded.

Method for estimating the efficiency loss of a turbocharger for an engine

A control system is provided for thermal management of an aftertreatment device in an engine that is provided in an enclosure. The engine has a cooling fan that is operable in a first direction to cool said engine. The fan is also operable in a reverse direction opposite to the first direction. The control system includes a first temperature sensor that measures a temperature of the engine or the enclosure. The control system further includes a second temperature sensor that measures a temperature of the aftertreatment device. The control system also includes a processor that is coupled to the first and second temperature sensors. The processor is configured to issue control signals, based on whether regeneration is required by the aftertreatment device or not, for selectively controlling a direction of operation associated with the cooling fan.

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Peterborough, United Kingdom

Ross Daniel Collins