Scania Cv Ab (publ)

Johan Linderyd

Anders Larsson

Christer Mattsson

Fredrik Agrell

Ulf Lundqvist

Johan Eriksson

An arrangement and a method for a combustion engine for self-ignition of a fuel mixture. A first device supplies a first partial quantity of the fuel mixture to the combustion space, and a second device supplies a second partial quantity of the fuel mixture to the combustion space, which second partial quantity of the fuel mixture is at a different fuel concentration from the first partial quantity of the fuel mixture. The devices supply the first and the second partial quantities of the fuel mixture as to create in the combustion space at least one region which is at a higher fuel concentration than other regions and in which the self-ignition of the fuel mixture is intended to start.

Arrangement and method for a combustion engine

An arrangement and a method for controlling a combustion engine, e.g. of the type called HCCI engine. A control unit for controlling the self-ignition of the fuel mixture towards an optimum crankshaft angel (cad) within a load range (L). The load range (L) can be divided into at least two subranges (L, L) and the control unit is adapted to controlling the self-ignition of the fuel mixture towards an optimum crankshaft angle (cad) within a first subrange (L) by means of a strategy (I) which entails a variable amount of hot exhaust gases being supplied to or retained in the combustion chamber, and within a second subrange (L) by means of another strategy (II) which entails the effective compression ratio (c) in the cylinder being varied.

Arrangement and method for controlling a combustion engine

An arrangement and a method for controlling a combustion engine, e.g. of the type called HCCI engine. A control unit is operable for controlling the self-ignition of the fuel mixture towards an optimum crankshaft angle (cad) within a load range (L). The load range (L) can be divided into at least two subranges (L, L). The control unit is operable to controlling the self-ignition of the fuel mixture towards an optimum crankshaft angle (cad) within one of the subranges (L) by a strategy (II) which entails the effective compression ratio (c) in the cylinder being varied, and within the second subrange (L) by another strategy (III) which entails a variable amount of cooled exhaust gases (ceg) being led to the combustion chamber also enabling in the second subrange (L) to control the self-ignition of the fuel mixture towards an optimum crankshaft angle (cad) by variation of the effective compression ratio (c) in the cylinder without it falling below a lowest acceptable value (C).

Arrangement and method for controlling combustion in a combustion engine

A combustion engine with compression-initiated combustion comprises at least one cylinder in which a piston is movable axially between a lower dead center point and an upper dead center point, with a dead volume between the cylinder and the piston at the upper dead center point. The dead volume comprises at least two substantially separate spaces in the piston and/or the cylinder at the upper dead center point which are designed to ensure that combustion is initiated at different times.

Piston-cylinder combination for a combustion engine

A method for fuel injection in a four-stroke combustion engine () of piston-and-cylinder type with compression ignition, whereby a specified fuel quantity is supplied to a combustion chamber () for each working cycle, and whereby EGR gases are led back to the combustion chamber (). At least a first portion of said fuel quantity is combined with hot EGR gases for supply to the combustion chamber (). The invention also relates to a combustion engine working according to the method.

Method for fuel injection in a combustion engine and combustion engine

The present invention relates to an arrangement for controlling at least one engine valve ( ) of a combustion engine. The arrangement incorporates a hydraulic circuit with a pump ( ), a control valve ( ) which is designed to control a flow of medium in the circuit, and a power device ( ) which is designed to move the engine valve ( ) between open and closed positions. The pump ( ) is designed to circulate a flow of medium continuously in at least part of the circuit during an operating state of the combustion engine, and the control valve ( ) is designed to direct as necessary the flow of medium circulated by the pump ( ) to the power device ( ) so that the latter moves the motor valve ( ) in a desired direction.

Growing community of inventors

Sundbyberg, Sweden

Johan Linderyd