Cummins Engine Company, Inc.

Todd A Sheridan

Rod Radovanovic

Peter Vinson Woon

A S Ghuman

Angela R May

John M Janssen

Angie R May

EGR induction supercharged or turbocharged internal combustion engine having EGR and EGR cooling in which EGR cooling is obtained through jacket water coolers and/or an air-to-air aftercooler. EGR induction is obtained via either low pressure (ambient) induction to the system intake, or via venturi or passive pump induction into the pressurized intake. Bypassing of the EGR cooler is used to reduce condensation and fouling in the EGR cooler and to provide warmer air to reduce light load and cold ambient hydrocarbon production. A passive or catalyzed particulate trap and crankshaft driven supercharger boosting system are provided to address engine response deterioration and particulate increase problems associated with EGR.

Cooled exhaust gas recirculation system with load and ambient bypasses

A control system for a diesel engine for creating an ON/OFF feedback signal for controlling engine-related functions includes a mechanical assembly involving a fuel injection pump, a governor for the fuel injection pump, a pair of cam stops as part of the governor and an electrically grounded moveable rack finger. One of the cam stops is a fixed stop which limits travel of the rack finger and thus limits fueling to a predetermined level. The only variable which determines fuel quantity for this full load cam stop is engine speed. The second stop which limits rack finger travel is an air-fuel cam stop which has two independent variables that determine the fuel limit. These independent variables are engine speed and engine boost pressure. The air-fuel cam stop is placed within a housing which is electrically isolated from the rest of the fuel pump and the engine. Once there is contact between the moveable rack finger and the air-fuel cain an electrical signal (ON) is created which may be used to activate or energize other engine-related functions such as shutting off EGR during air limited operation.

Mechanical air-fuel control for feedback control of external devices

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Franklin, IN, United States of America

Todd A Sheridan