Ab Volvo

Volvo Tekisk Utveckling Ab

Anders Hoglund

Jan Eismark

Bo Karl Svensson

Ingemar Magnusson

Ulla Sarnbratt

Method of controlling the injection of a fluid into an internal combustion engine, comprising a piston reciprocating in a cylinder between top and bottom dead center points, and a nozzle arranged in the cylinder. The method includes injecting a fluid with an initial injection pressure into the cylinder, the fluid being ignited, so that the pressure in the cylinder increases, thereby causing the piston to be displaced towards the top dead center point, and effecting at least one injection pause during injection. The injection, immediately after the injection pause, is effected so that the injection pressure has increased in an interval of more than 0 bar and up to 2000 bar relative to an injection pressure prevailing immediately prior to the injection pause, and the injection pause is effected for a duration corresponding to an angle of rotation of an engine crankshaft in the interval 1&#xb0;-30&#xb0;.

Method of controlling the injection of fluid into an internal combustion engine

Process which, by spray-controlled, directly injected combustion with the aid of step-by-step technical development of the whole of the combustion system, achieves an intensified mixing process during injection and after-burning, which speeds up soot oxidation during various stages so effectively that the engine can be run with sufficiently high EGR content for desired NOx and soot content down to ultra-low emissions, at the same time as parameters which control the efficiency are decoupled from measures for desired emission level, thereby enabling optimum efficiency to be attained for the process.

Method for controlling a combustion process in a combustion engine

A method of controlling the fuel injection in an internal combustion engine ( ) having a piston ( ), which passes to and for in a cylinder ( ) between an upper and a lower dead center, and an injection nozzle ( ), which is disposed in the cylinder ( ), the method including the steps whereby a primary injection of fuel is realized in the cylinder ( ), which fuel is ignited and causes the piston ( ) to be moved in the direction of the lower dead center in the cylinder ( ), and whereby a post-injection of a fluid is realized in the cylinder ( ). The injection pressure of the fluid in the post-injection is higher than the injection pressure of the fuel in the primary injection.

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Fjaras, Sweden

Anders Hoglund