Fca US LLC

Kenneth E Hardman

Jeff Brand

Ryan M Sturgeon

John D Frederick

An internal combustion engine system includes an internal combustion engine, an air intake conduit, an exhaust system with a catalytic converter, a combined catalyst preheating/exhaust gas recirculation (EGR) system with a recirculation passage, a heating element, and a preheating/EGR valve configured to selectively allow flow through the recirculation passage, and an electric turbocharger assembly including a compressor and a turbine rotatably coupled by a shaft. A controller is configured to operate in (i) a catalyst preheating mode where the preheating/EGR valve is opened to allow intake air into the recirculation passage, and the electric turbocharger compressor is operated to force intake air through the recirculation passage and the heating element to rapidly heat the catalytic converter, and (ii) an EGR mode where the throttle is opened to allow intake air to flow into the engine, and the preheating/EGR valve is opened to allow exhaust gas into the recirculation passage.

Dual function catalyst preheating and EGR system

An internal combustion engine system includes an internal combustion engine, a main exhaust aftertreatment system with a main catalytic converter configured to receive exhaust gas from the internal combustion engine, and a turbocharger turbine selectively rotatable in a first direction for a normal operation and an opposite second direction for a reverse rotation operation. A light-off catalyst bypass system with a bypass passage and a bypass catalytic converter is configured to selectively receive exhaust gas from the internal combustion engine and bypass the turbine. During cold start, long idle, and/or low main catalytic converter temperature conditions, the turbine is rotated in the second direction to restrict or prevent exhaust gas from flowing through the turbine to facilitate directing the exhaust gas through the bypass passage and the bypass catalytic converter.

Cold start catalyst bypass system

A control system for an engine comprising an electric turbocharger and a wastegate is presented. The system is configured to variably open and close to control the flow of exhaust gas in an exhaust system of the engine at a turbine of the electric turbocharger; and a controller that obtains parameters including an exhaust flow rate through the exhaust system. The controller uses the parameters to (i) determine a desired speed of the electric turbocharger to satisfy no flow of the exhaust gas through the turbine; (ii) command the electric turbocharger to rotate in a reverse direction at the desired speed to achieve no flow of the exhaust gas through the turbine; (iii) determine whether an exhaust gas treatment system (ETS) has reached a desired temperature; and (iv) command the electric turbocharger to rotate in a forward direction based on the ETS reaching the desired temperature.

Electric turbocharger emissions control

A ninety-degree V-engine having eight or more cylinders can include a first pipe that connects an exhaust port of a first dedicated EGR cylinder bank to an intake manifold and a second pipe that connects an exhaust port of a second dedicated EGR cylinder of a different cylinder bank to the intake manifold, the first and second dedicated EGR cylinders each being one of two consecutive cylinders in a corresponding cylinder bank specified by a specific cylinder firing order.

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Clarkston, MI, United States of America

Kenneth E Hardman