Cummins Engine Company, Inc.

John M Janssen

Rod Radovanovic

Peter Vinson Woon

Amarjit S Ghuman

A S Ghuman

Byron J Bunker

Todd A Sheridan

Angie R May

A system and a method for hydraulic actuation of poppet valves. The poppet valve is opened by application of hydraulic pressure to a piston, and is closed by action of a mechanical spring. Hydraulic pressure comes from either a high pressure source of a low pressure source, the low pressure source being higher than ambient pressure. Application of hydraulic pressure is made by a pressure control device based upon signals received from an electronic controller. Hydraulic pressure is applied in a way that minimizes the power required to actuate the valve by making use of valve inertia.

Dual-pressure hydraulic valve-actuation system

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

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Columbus, IN, United States of America

John M Janssen