Scania Cv Ab

Scania Cv Ab (publ)

Scania Cv Aktiebolag

Håkan Sarby

Ola Stenlåås

Andreas Dahl

Christer Lundberg

Eric Olofsson

Mattias Berger

Daniel Hjortborg

Jonas Aspfors

Ulf Nylén

Klas Olofsson

Ola Jönsson

Marcus Ahlin

Henrik Hittig

Hanna Lind

Fredrik Birgersson

Johan Linderyd

Magnus Pelz

Henrik Skog

The disclosure concerns a method for vibration reduction in a compression ignition four-stroke internal combustion engine. The internal combustion engine comprises exhaust and intake valves controlled by exhaust and intake camshafts. The method comprises, when operating the internal combustion engine below a threshold rotational speed, steps of: changing a timing of the exhaust camshaft to advance closing of the exhaust valve, and —changing a timing of the intake camshaft to delay opening of the intake valve.

Vibration reduction in internal combustion engine

The present disclosure relates to an exhaust gas aftertreatment system and method for controlling same. The exhaust gas aftertreatment system comprises: a reductant dosing device; a selective catalytic reduction device arranged downstream of the reductant dosing device; an ammonia slip catalyst arranged downstream of the SCR device; a feedback NOx sensor arranged downstream of the SCR device and upstream of the ammonia slip catalyst; a tailpipe NOx sensor arranged downstream of the ammonia slip catalyst; and a control device configured for: providing an initial dosing of reductant from the reductant dosing device; obtaining a feedback signal from the feedback NOx sensor and a tailpipe NOx signal from the tailpipe NOx sensor; and adjusting the dosing of reductant until the feedback signal exceeds the tailpipe NOx signal by a value within a predetermined positive interval.

Exhaust gas aftertreatment system

The disclosure concerns an internal combustion engine comprising an exhaust camshaft, an intake camshaft, a turbocharger, and a control system. The turbocharger comprises a compressor. A timing of the exhaust camshaft and a timing of the intake camshaft are controllable by the control system, which is configured to: store a compressor map related to the compressor, store a reference area within the compressor map, and determine at least two parameters. In response to the at least two parameters indicating that a current operational point of the compressor is outside the reference area, the control system changes the timing of the exhaust camshaft to advance closing of the exhaust valve, and the timing of the intake camshaft to delay opening of the intake valve.

Four-stroke internal combustion engine and method of controlling timings of an exhaust camshaft and an intake camshaft

The present invention relates to use of a lubrication oil that forms water-soluble ash when combusted in an engine system, where the engine system comprises an internal combustion engine; an exhaust gas system comprising a diesel particulate filter to capture particulate matter from the exhaust gases, including the water-soluble ash; and an exhaust gas conduit to lead exhaust gases from the internal combustion engine to the exhaust gas system, and to collect condensed water formed by a cold start and/or a cold operation of the internal combustion engine and lead the condensed water through the diesel particulate filter, thereby dissolving and removing the water-soluble ash from the diesel particulate filter.

Use of a lubrication oil that forms water-soluble ash when combusted, engine system in which the oil is used and a vehicle comprising the engine system

An arrangement for injecting a reducing agent into an exhaust line of a combustion engine (). An exhaust line () leads exhaust gases from the engine. A first turbine () is in the exhaust line (). A second turbine () in the exhaust line is downstream of the first turbine () in the intended direction of flow in the exhaust line. An injector () injects reducing agent into the exhaust line () so that it is warmed and vaporized by the warm exhaust gases in the exhaust line (), and an SCR catalyst (). The injector () is in the exhaust line downstream of the first turbine () and upstream of the second turbine ().

Arrangement for injecting a reductant into an exhaust line of an internal combustion engine

An arrangement for controlling injection of a reducing agent in an exhaust line of a combustion engine (): An injection system (-) injects the reducing agent into the exhaust line (). A first catalyst () reduces the amount of nitrogen oxides in the exhaust gases in the exhaust line () using the reducing agent. A second catalyst () downstream of the first catalyst () in the exhaust line () converts ammonia in the exhaust gases to nitrogen gas and nitrous oxide. A nitrous oxide sensor () monitors the amount of nitrous oxide in the exhaust line () downstream of the second catalyst (). A control unit () of the injection system (-) adjusts the amount (q) of reducing agent injected into the exhaust line () if the sensor () detects that the amount of nitrous oxide is not within a selected range (A).

Arrangement and method for controlling the quantity of a reductant introduced into an exhaust line of an internal combustion engine

An arrangement for recirculation of exhaust gases in a supercharged combustion engine. The arrangement includes an exhaust line operable to lead exhaust gases out from the combustion engine, an inlet line operable to lead air at above atmospheric pressure to the combustion engine, a return line which comprises a connection to the exhaust line and a connection to the inlet line, so that via the return line it is possible to recirculate exhaust gases from the exhaust line to the inlet line. A first cooler incorporated in the return line for cooling the exhaust gases in the return line before they are mixed with the air in the inlet line. The exhaust gases in the first cooler are cooled by a first medium which is at a temperature substantially corresponding to the temperature of the surroundings.

Arrangement for recirculation of exhaust gases of a super-charged internal combustion engine

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Huddinge, Sweden

Håkan Sarby