Scania Cv Ab

Andreas Liljestrand

Per Bremberg

Lars Eriksson

Ulf Carlsson

Daniel Arvidsson

Magnus Nilsson

Henrik Birgersson

Erik Gustafsson

A method at an exhaust gas cleaning system for an engine () in which a reducing agent is added to a passage () for exhaust gases from the engine () for cleaning the exhaust gases. The exhaust gas cleaning system includes arrangements () that require a certain temperature level (Tmax) in order to achieve catalytic exhaust gas cleaning. The method is to distribute and store (s) a limited amount of reducing agent at temperature level (Tmax); and to use (s) during a cold start of the exhaust gas cleaning system, the distributed and stored reducing agent to achieve the catalytic exhaust gas cleaning. Also a computer program product () to implement the method. Also an arrangement for an exhaust gas cleaning system for an engine (), and a motor vehicle () equipped with the arrangement.

Device and method at an exhaust afterteatment system for an engine

A method for safety improvement during operation of a motor vehicle () includes the steps of: &#x2014;determining a prevailing speed of the vehicle (); automatically activating a warning flasher function () on the basis of determined values pertaining to at least some combination of conditions based on: vehicle speed (V) and gradient (L) of the running surface on which the vehicle () is travelling, and the speed of the vehicle () compared with surrounding traffic and the gradient (L) of the running surface on which the vehicle () is travelling. Also a computer program product including program code (P) for a computer () for implementing the method is disclosed. Also a system for safety improvement during operation of a motor vehicle () and to a motor vehicle () which is equipped with the system are disclosed.

System and method for safety improvement during operation of a motor vehicle

Device and method at an exhaust aftertreatment system for an engine

A method for an SCR system comprising a dosing unit () for dosing reducing agent into an engine exhaust duct () upstream of a SCR catalytic converter () for reducing the NOx level in an exhaust flow from the engine. The SCR system comprises a pressurizing device () for feeding reducing agent from a container () to the dosing unit () arranged so as to dose reducing agent to the exhaust duct () under pressure. The method includes the step of: reducing, during periods of non-continuous dosing of reducing agent during continued maintained operation of the pressurizing device (), the pressure (s; s) of the reducing agent at the dosing unit () compared to the pressure during continuous dosing. Also a computer program product containing program code (P) for a computer () for implementing a method according to the invention. The invention also concerns an SCR system and a motor vehicle that is equipped with that system.

Method pertaining to an SCR system and an SCR system

A method pertaining to an SCR system for cleaning of exhaust gases from an engine (). A dosing unit () is in thermal contact with the engine's exhaust system and supplies a reducing agent to an exhaust duct () of the exhaust system. Determining (s) whether there is an undesired temperature level of the dosing unit (). If yes, limit (s) the temperature of the exhaust duct () by controlling operation of the engine. Also, a computer program product containing program code (P) for implementing the method. Also a device and a motor vehicle () which is equipped with the device are disclosed.

Method and device pertaining to limiting the temperature of a dosing unit in a SCR system

A method for cooling a dosing unit () pertaining to an SCR system for exhaust cleaning, wherein after cessation of exhaust flow, cooling a reducing agent dosing unit () by a reducing agent supplied to it. Also running a feed device to supply the coolant reducing agent at reduced power, compared with ordinary operation. A computer program product containing program code (P) for a computer () implements a method of the invention. Also an SCR system and a motor vehicle which is equipped with the SCR system are disclosed.

Method and device pertaining to cooling of dosing units of SCR systems

A method pertaining to an SCR system for cleaning of exhaust gases from an engine including a dosing unit () to supply a reducing agent to an exhaust duct (): Determining (s) whether there is an undesired temperature level of the dosing unit (). If one is found, removing (s) warmed reducing agent from the dosing unit () and supplying it to the exhaust duct (). Calculating (s) and removing an amount of reducing agent based on a prevailing temperature of the dosing unit (), or removing warmed reducing agent. Also a computer program product containing program code (P) for a computer () for implementing the method. Also a device of an SCR system and a motor vehicle () which is equipped with the device are disclosed.

Method and device pertaining to dosing unit of SCR system

A method pertaining to an SCR system for exhaust cleaning, includes deciding about a need, after cessation of an exhaust flow, to cool a reducing agent dosing unit () by a reducing agent supplied to it, and includes predicting a temperature pattern of the dosing unit () as a basis for deciding about the need and predicting whether a predetermined temperature of the dosing unit will be reached after cessation of exhaust flow. Also a computer program product containing program code (P) for implementing the method, an SCR system and a motor vehicle which is equipped with the SCR system are disclosed.

A method pertaining to an SCR system which includes a dosing unit () to supply reducing agent to an exhaust duct () for exhaust cleaning, and a container for reducing agent: the steps of determining (s) a cooling requirement of the dosing unit () and choosing (s) a limit level for reducing agent in the container () on the basis of the cooling requirement. A computer program product containing program code (P) implements a method according to the invention. A device of an SCR system includes a dosing unit () to supply reducing agent to an exhaust duct () for exhaust cleaning. A motor vehicle () is equipped with the device.

Disclosed is a method pertaining to SCR systems for exhaust cleaning whereby liquid is supplied to a feed device via which it is supplied to a dosing unit at a consumption point of the SCR system. The method includes continuously determining cumulative amounts of liquid dosed via the dosing unit. Need for replacement or cleaning of a filter unit for said liquid is also determined on the basis of the cumulative amounts of liquid dosed. The method further includes dosing at least part of the liquid supplied via the feed device and feeding undosed liquid back in a return flow to enable it to be supplied again to the feed device. Also disclosed is a computer program product that includes code for a computer for implementing the disclosed method.

Method and a device pertaining to the service need of a filter in a SCR-system's liquid supply device

A method pertaining to an SCR system in which reducing agent in liquid form is supplied to a feed device () and via which feed device reducing agent is supplied to at least one consumption point () from a container (): the steps of continuously detecting the feed pressure (P) which the feed device () furnishes, and controlling the operation of the feed device () on the basis of changes (P') in the feed pressure (P), with the object of reducing the impact of unwanted air supply at the feed device (). Also pertaining to a computer program product containing program code (P) for a computer () for implementing a method according to the invention. Also an SCR system and a motor vehicle which is equipped with the SCR system are disclosed.

Growing community of inventors

Södertälje, Sweden

Andreas Liljestrand