Daimler-benz Ag

Mercedes-benz Aktiengesellschaft

Daimler Chrysler Ag

Gunter Karl

Roland Kemmler

Peter Hohner

Frank Duvinage

Friedrich Noltemeyer

Bernd Baur

Klaus Rossler

Stephan Kramer

Klaus Meier

Friedrich Rusch

Jorg Abthoff

Christian Enderle

Gregor Renner

Johannes Leweux

Michael Kramer

Helmut Schorn

Andreas Biemelt

Rudolf Klein

Christoph Lux

Martin Bezner

Leopold Mikulic

Peter Lautenschutz

Alexander Anderson

Matthias Schumacher

Jurgen Munzenmaier

Alfred Hoppe

Ronald Kalversberg

Method for increasing the safety of motor-vehicle occupants in the event of a crash

A method for operation of a direct-injection spark-ignition internal combustion engine operated over large areas of the characteristics map with stratified charge by way of fuel injection during the compression stroke. In order to guarantee reliable mixture ignition and combustion, the method of the present invention provides an ignition system which generates alternating voltage so that high voltage rapidly builds up between the electrodes of a spark plug, and generates ignition sparks with a spark duration that can be defined as a function of operating point.

Method for operation of a direct-injection spark-ignition internal combustion engine

Direct-injected engines often operate in broad characteristic field areas with stratified charging, with the harmful emissions not being sufficiently reducible by exhaust recirculation means. Nitrogen oxide molecules are not selectively catalytically reducible In oxygen-rich exhaust during stratified combustion; thus a storage catalytic converter is often located in the exhaust stream to adsorb the resultant nitrogen oxide molecules. In order to initiate desorption and reduction of stored nitrogen oxide molecules, a stoichiometric exhaust composition must be created for a certain operating interval. It was previously assumed that stoichiometric air ratios can only be attained with homogeneous carburetion, so that a switch is made to injection on the intake stroke from fuel injection on the compression stroke. In order to produce a method for reducing nitrogen oxide emissions from a direct-injected gasoline engine, which reduces nitrogen molecules during continuous stratified charging, provision is made to increase the exhaust gas circulation rate for the required operating interval, depending on the operating point of the engine, by a certain amount to create a stoichiometric exhaust composition before the adsorption capacity limit of the storage catalytic converter is reached.

Method and apparatus for nitrogen oxide emission of a direct injection

Otto internal-combustion engines having one injector respectively per cylinder for the internal mixture formation can be operated at full load or high partial load by fuel injection in the suction stroke of the piston and, at medium or low partial load, with a compression stroke injection. The compression stroke injection, which is advantageous in this load range, because of low average combustion space temperatures and the tendency to form deposits in the combustion space because of residues of liquid fuel and the resulting impaired operating conditions, can partially be carried out only to a limited degree. In order to provide a process for operating an Otto internal-combustion engine of the above-mentioned type which permits an arbitrary operating period in the medium or low load range, it is provided that, in the operation of the internal-combustion engine with a compression stroke injection, as a function of the time or at least of an operating parameter, independently of the momentary load requirement, a change-over takes place to a suction stroke injection while simultaneously reducing the intake air quantity and, after the conclusion of a certain free-burning interval, a switching-back takes place into the operating mode with the compression stroke injection.

Process for operating an Otto internal-combustion engine having an

In an internal combustion engine with direct fuel injection having a piston disposed in a cylinder and a cylinder head which together define a combustion chamber, wherein a fuel injector is mounted in the cylinder head so as to inject fuel into the combustion chamber in a conical pattern whereby the fuel is mixed with combustion air to form a combustible mixture, the cylinder head has a shape around the conical fuel pattern which aids in providing combustible fuel/air mixture at least in an area adjacent the conical fuel pattern where a spark plug with electrodes is mounted such that its electrodes are disposed outside the conical fuel pattern.

Internal combustion engine with direct fuel injection

In an inlet system for a two-cycle internal combustion engine which includes a cylinder with a piston reciprocating therein between a top dead center position and a bottom dead center position and in which at least two rows of scavenging air flow passages are arranged in separate flow planes around the cylinder adjacent the bottom dead center position of the piston which are closed by the piston when it is remote from the bottom dead center position, each of the separate flow planes includes independent air flow control components for independently controlling the admission of scavenging air to the scavenging air passages in the different flow planes.

Inlet system for a two cycle internal combustion engine

In a two-stroke internal combustion engine with an engine block including a crankcase and a cylinder housing receiving pistons which are connected to a crankshaft by crosshead rods with crossheads guided for linear movement with the piston and a connecting rod extending between the crosshead and the crankshaft, wherein the cylinders have walls with inlet and outlet slits disposed above the bottom dead-center position of the piston and providing for communication between the cylinder and inlet and outlet channel structures formed in the cylinder housing around the pistons, the engine block consists of a cylinder housing and a crankcase joined along a dividing plane extending across the engine block below the lowest piston ring when the piston is in its bottom position and the cylinder housing includes channel structures which are open toward the dividing plane and have walls extending inwardly and have inner surfaces in engagement with the piston for guiding said piston and to form, with the piston skirt, the gas inlet and outlet channels through which gases are supplied to, and discharged from, the cylinder.

Two-stroke internal combustion engine

In a port-controlled two-stroke internal combustion engine with an engine block comprising a crankcase and a cylinder block including pistons connected to a crankshaft by crosshead rods with crossheads guided for linear movement with the pistons, and connecting rods extending between the crossheads and the crankshaft a partition structure is arranged between the crankcase and the cylinder block and includes hollow cylindrical sleeves which project axially into the cylinders to a point closely adjacent the undersides of the piston tops when the pistons are in their bottom dead center positions and the sleeves are spaced from the cylinder walls to form between the sleeves and the cylinder walls annular spaces for receiving the depending skirts of the pistons.

Port-controlled two-stroke internal combustion engine

Growing community of inventors

Esslingen, Germany

Gunter Karl