Volvo Lastvagnar Ab

Volvo Lastvagner Ab

Bert-Inge Bertilsson

Lennart Andersson

Annika Carlsson

Lennart Åberg

Ivar Sahlén

Peteris Lauberts

Robert Vulin

A charge air system for a combustion engine and an operation method are provided. The charge air system includes a first turbocharger stage for intake of combustion air supplied to the engine from a first pressure to a second pressure, a second turbocharger stage for compression of the compressed air to a third pressure, a first heat exchanger being arranged between the first and the second turbocharger stage for cooling the compressed air, a first intake air bypass for modulating the flow of the air through the first heat exchanger and/or a first mass flow control unit for controlling the flow of a cooling medium supplied to the first heat exchanger.

Charge air system and charge air operation method

The present invention relates to a method for achieving reduced emissions at cold start of an internal combustion engine having an exhaust gas after treatment system comprising at least one Diesel Oxygen Catalyst (DOC), at least one Diesel Particulate Filter (DPF) and a Selective Catalytic Reduction (SCR) unit, comprising the steps of: heating the DOC prior to cold starting said internal combustion engine, starting and controlling the internal combustion engine towards low NOx emission when said DOC has reached a predetermined temperature, optimizing the fuel consumption at a given total emission level when said DPF and SCR has reached a predetermined temperature.

Method and apparatus for cold starting an internal combustion engine

A cooling structure for cooling a liquid-cooled internal combustion engine is provided where the engine includes an EGR passage interposed between an exhaust manifold structure and an inlet manifold structure of the engine. The cooling structure includes a first cooling system and a second cooling system. The first cooling system includes at least one radiator and a liquid coolant circulatable through the radiator and the internal combustion engine for cooling the internal combustion engine. A flywheel housing for the internal combustion engine is provided with at least a portion of the second cooling system.

Internal combustion engine with a first and second cooling system

Apparatus and a process for supplying recirculated exhaust gases to incoming air to a piston-type internal combustion engine. The apparatus includes a duct () for incoming air and a feed pipe () for exhaust gases and is especially well characterized in that the feed pipe () opens out into an outlet section () having at least one outlet () for the supply of the exhaust gases, which outlet section constitutes an outlet path (a) extended in the longitudinal direction of the duct.

Apparatus for supply of recirculated exhaust gas

Method and arrangement for enhancing exhaust gas recirculation efficiency on a combustion engine by providing a combustion engine having an exhaust system in fluid communication, via at least one juncture, with an exhaust gas recirculation system and locating a reflector in the exhaust system downstream of the at least one juncture. The reflector is adapted to reflect at least a portion of exhaust gas pressure pulses emitting from the combustion engine thereby causing a reflected pressure pulse to occur upstream of the reflector, and deflecting at least a portion of the reflected pressure pulse into the exhaust gas recirculation system thereby enhancing the efficiency of the exhaust gas recirculation system.

Pulse reflecting method and arrangement in an exhaust gas recirculation system

Internal combustion engines are described including a crankshaft and at least one cylinder, an intake line for supplying air to the cylinder, an exhaust line for discharging exhaust gases from the cylinder, a recirculation line for recirculating at least a portion of the exhaust gases from the exhaust line to the intake line in order to reduce emissions from the engine, a valve in the recirculation line for controlling the flow of a portion of the exhaust gases therethrough, a turbocharger including a first turbocharging unit for absorbing energy from the exhaust gases and including a compressor to compress air supply to the intake line, and a second turbocharger unit disposed downstream of the first turbocharger unit for absorbing energy from the exhaust gases whereby a pressure is created in the exhaust line which is greater than the pressure in the intake line, and a power transmission line for transmitting power from the second turbocharger unit to the crankshaft. Methods for reducing emissions from internal combustion engines are also disclosed.

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Floda, Sweden

Bert-Inge Bertilsson