Volvo Truck Corporation

Johan Carlén Andersson

Fredrik Rahm

Ulf Aronsson

Jens Pedersen

The invention relates to an internal combustion engine comprising a crankshaft, one or more cylinders including a cylinder head, a piston, a combustion chamber, one or more intake valves, one or more exhaust valves, an intake system configured for feeding intake air to the engine, an exhaust system configured for conveying exhaust gas away from the engine, a pressure charging system connected to the intake system and an exhaust gas recirculation (EGR) system arranged to feed branched off exhaust gas from the exhaust system to the intake system via an EGR conduit wherein: * the internal combustion engine includes a valve actuation device configured to allow for late or early closing of the intake valves in accordance with late or early Miller-type valve timing, and wherein * the EGR system includes a gas feeding device configured to feed exhaust gas through the EGR conduit in modes of operation wherein the pressure in the intake system exceeds the pressure in the exhaust system, * wherein the gas feeding device is a displacement pump and wherein the gas feeding device is arranged so that exhaust gas recirculating in the EGR system during operation of the engine passes the gas feeding device before being mixed with intake air in the intake system. Additionally, a method of improving efficiency of an internal combustion engine is described.

Internal combustion engine

Provided herein is internal combustion engine system including: an internal combustion engine; a turbocharger turbine operatively connected to a turbocharger compressor; an air intake system; an exhaust gas system; an exhaust gas recirculation (EGR) conduit; an EGR valve; and a turbomachine arranged in the EGR conduit. Further, the EGR valve and the turbomachine are positioned in relation to each other in the EGR conduit such that a flow of high pressure exhaust gas through the EGR conduit towards the air intake system reaches the EGR valve before reaching the turbomachine; an additional exhaust gas conduit is arranged between the EGR conduit and a point of the exhaust system downstream the turbocharger turbine so as to allow exhaust gas to flow.

Internal combustion engine system and method for reduced turbo lag

The invention relates to a method for starting operation of an internal combustion engine, wherein the method comprises the steps of: when the internal combustion engine is not operating, providing pressurized gas in the air intake duct; opening the intake valve in a first cylinder while keeping the exhaust valve of the first cylinder closed so as to allow the pressurized gas to enter the first cylinder, press onto the corresponding piston and thereby move the corresponding piston and rotate the crank shaft; supplying fuel to at least one of the cylinders where the corresponding piston has performed or is performing a compression step so as to ignite the fuel and start operation of the engine.

Method for starting operation of an internal combustion engine

The invention relates to a method for controlling an internal combustion engine system (), wherein the internal combustion engine system () is provided with an air intake duct (), an exhaust gas duct () and an exhaust gas recirculation (EGR) system (), wherein the EGR system () comprises an EGR conduit () that fluidly connects the exhaust duct () and the intake duct (), and wherein a gas feeding device () is arranged in the EGR conduit (), said gas feeding device () being configured to feed exhaust gas from the exhaust duct () to the intake duct () during operation of the engine system (). The method is characterized in that it comprises the step of: detecting a risk of freezing of condensed water in the EGR conduit (), and, in case such a risk is detected and in case the gas feeding device () is not in operation, operating the gas feeding device (). The invention also relates to an internal combustion engine system () configured for being operated by such a method and to a vehicle () provided with such an engine system (). The invention further relates to means for controlling the above method.

Method for controlling an internal combustion engine system

The invention relates to an internal combustion engine comprising a crankshaft, one or more cylinders including a cylinder head, a piston, a combustion chamber, one or more intake valves, one or more exhaust valves, an intake system configured for feeding intake air to the engine, an exhaust system configured for conveying exhaust gas away from the engine, a pressure charging system connected to the intake system and an exhaust gas recirculation (EGR) system arranged to feed branched off exhaust gas from the exhaust system to the intake system via an EGR conduit wherein: &#x2014;the internal combustion engine includes a valve actuation device configured to allow for late or early closing of the intake valves in accordance with late or early Miller-type valve timing, and wherein&#x2014;the EGR system includes a gas feeding device configured to feed exhaust gas through the EGR conduit in modes of operation wherein the pressure in the intake system exceeds the pressure in the exhaust system. Additionally, a method of improving efficiency of an internal combustion engine is described.

The present invention relates to a method for controlling an internal combustion engine arrangement () connected to an exhaust gas aftertreatment system (), wherein the method is arranged to control a gas heating device (), as well as a gas feeding arrangement to direct a flow of intake air through the exhaust gas recirculation conduit () from the intake system to the exhaust system, the flow of intake air being directed through the gas heating device before the intake air enters the exhaust gas aftertreatment system, in response to determining a requested start of the internal combustion engine to heat the aftertreatment system before starting the engine.

Method for controlling an internal combustion engine arrangement

The invention relates to a method for operating an internal combustion engine system (), wherein the internal combustion engine system () is provided with an air intake duct (), an exhaust gas duct () and an exhaust gas recirculation (EGR) system (), wherein the EGR system () comprises an EGR conduit () that fluidly connects the exhaust duct () and the intake duct (), and wherein a gas feeding device () configured to feed exhaust gas from the exhaust duct () to the intake duct () is arranged in the EGR conduit (). The method is characterized in that it comprises the step of: detecting an indication of accumulated deposits of soot, hydrocarbons or other contaminants in the gas feeding device () by determining whether a rotational friction of a rotary member () of the gas feeding device () exceeds a threshold value. The invention also relates to an internal combustion engine system () configured for being operated by such a method and to a vehicle () provided with such an engine system (). The invention further relates to means for controlling the above method.

Method for operating an internal combustion engine system

The invention relates to a method for operating an internal combustion engine system (), wherein the internal combustion engine system () is provided with an air intake duct (), an exhaust gas duct () and an exhaust gas recirculation (EGR) system (), wherein the EGR system () comprises an EGR conduit () that fluidly connects the exhaust duct () and the intake duct (), and wherein a gas feeding device () configured to feed exhaust gas from the exhaust duct () to the intake duct () is arranged in the EGR conduit (). The method is characterized in that it comprises the step of: providing a flushing liquid in the EGR conduit () upstream of the EGR gas feeding device () so as to flush and clean the EGR gas feeding device (). The invention also relates to an internal combustion engine system () configured for being operated by such a method and to a vehicle () provided with such an engine system (). The invention further relates to means for controlling the above method.

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Lund, Sweden

Johan Carlén Andersson