International Engine Intellectual Property Company, LLC

Timothy J Prochnau

Martin R Zielke

Luis Carlos Cattani

Qianfan Xin

John L Cagney

Michael D Bartkowicz

Tytus R Bulicz

Mahmoud S El-Beshbeeshy

Kai Chen

Antoun Y Calash

Steve Gravante

A control system for engine braking for a vehicle powered by a turbocharged engine uses a supercharger to assist a turbocharger compressor to boost turbocharger air flow into the engine cylinders. An engine driven air pumping device draws ambient air, or alternately exhaust gas through the pump inlet, compresses the air, and delivers the compressed air through the pump outlet to the turbocharger compressor inlet or alternately the turbocharger compressor outlet. The increased air flow into the cylinders and out of the cylinder exhaust valves increases retarding power of the vehicle.

Supercharged boost-assist engine brake

An engine system (20) includes an intake system (26) through which charge air enters combustion chambers, and an exhaust system (28) that includes a CDPF (34), through which products of combustion pass to the surrounding atmosphere. A throttle valve (36) is located in The exhaust system (28) downstream of both the CDPF (34) and the turbocharger turbine (30). An EGR flow path for recirculating exhaust gas from the exhaust system to the intake system includes an EGR valve (48) for controlling EGR flow. The EGR flow path is connected to the exhaust system upstream of the throttle valve and downstream of both the CDPF and the turbine, and to the intake system upstream of the turbocharger compressor Valves (36, 48) are under coordinated control provided by an engine control system (24) for selectively restricting the respective valves to attain desired EGR flow.

Clean, low-pressure EGR in a turbocharged engine by back-pressure control

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Vernon Hills, IL, United States of America

Timothy J Prochnau