Caterpillar Inc.

Adwait Vilas Joshi

David Andrew Pierpont

Cory Andrew Brown

Mary Lou Kesse

Brandon Bowditch

Kalyana Chakravarthy Vutukuri

Brandon Abel

Abhijitsinha Dilipsinha Pawar

A piston for an engine may include a piston body. The piston body may include a piston crown disposed symmetrically about a central longitudinal axis of the piston. A combustion bowl may be recessed into the piston body and may be offset axially inwardly with respect to the piston crown. A central bowl apex may protrude axially from the combustion bowl and may be offset axially inwardly with respect to the piston crown. A first bowl apex may protrude axially from the combustion bowl and may be disposed radially inwardly with respect to the piston crown. A second bowl apex may protrude axially from the combustion bowl and may be disposed radially inwardly with respect to the first bowl apex and may be radially between the first bowl apex and the central bowl apex. The second bowl apex may be offset axially inwardly with respect to the central bowl apex.

Combustion bowl of a piston for an engine

A method for calculating exhaust gas temperature indirectly at points in or around an engine exhaust after treatment system for use in determining an amount of unburned hydrocarbons resident therein at a given point in time.

Method for calculating exhaust temperature

An exhaust gas recirculation (EGR) system for an engine and a method of operating that system is disclosed. The system has a conduit arrangement for conducting exhaust gas from an exhaust side of the engine to an intake side of the engine, a valve arrangement configured for controlling the amount of exhaust gas to be recirculated and a conduit arrangement for providing intake air to the intake side of the engine. A sensor arrangement is provided and is configured to sense at least one parameter indicative of the humidity of the recirculated exhaust gas and the intake air at the intake side of the engine. A control arrangement is configured to receive a signal from the first sensor arrangement and further is configured to control the valve arrangement in response to a determination by the control arrangement that the first parameter is outside a desired range for low-NOemission during a subsequent combustion period.

Exhaust gas recirculation system and method of operating such system

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Dunlap, IL, United States of America

Adwait Vilas Joshi