Abstract:
The method serves for the operation of an Otto-cycle internal combustion engine with fuel injection on a cold start and is characterised by the following steps: retarding adjustment (13) of the ignition angle to a cold start value, for at least the first combustion, in at least one cylinder, of the internal combustion engine, during a cold start phase, whereby the fuel injected into the cylinder is made to combust and a normal adjustment (14) of the ignition angle to terminate the cold start phase.
Abstract:
The invention concerns a waveguide laser comprising a laser-active medium, a pump source for the laser-active medium and a resonator (19) with a waveguide (10) extending in an axial direction and formed from a cylindrical, outer optical waveguide surface (12) and a cylindrical, inner optical waveguide surface (14), between which surfaces a resonator radiation field extends substantially parallel to the axial direction (16). The waveguide laser further comprises two cavity mirrors (18, 20) between which the resonator radiation field extends and of which at least a first mirror comprises successive maximum and minimum reflectivity values in a direction azimuthal to the axial direction. In order to produce a waveguide laser of this type, in which a selected specific mode stimulates oscillations, in accordance with the invention the maximum and minimum reflectivity values of the first cavity mirror, viewed in the azimuthal direction, are arranged at the location of maximum and minimum intensities of a selected azimuthally closed mode of the resonator (19), which mode is enclosed by the resonator radiation field, and intermediate regions in which the reflectivity is between the maximum and minimum values extend in the azimuthal direction between the successive maximum and minimum values.
Abstract:
The invention relates to a fuel supply system for an internal combustion engine that is provided with a fuel feed pump (10) that supplies the pre-pressurized fuel to a high-pressure fuel pump (11) that is linked with at least one injection valve (14) on the high-pressure side to supply the injection valve with the pressurized fuel. The aim of the invention is to avoid the formation of steam bubbles in the high-pressure fuel pump (11) that impairs the pump capacity or the pressure generation. To this end, the high-pressure fuel pump (11) can be supplied with a coolant flow via at least one cooling channel (21) for maintaining the temperature (THDP) of the high-pressure fuel pump (11) below a critical working temperature (TK1).
Abstract:
Die Erfindung betrifft ein Verfahren zum Betreiben einer Brennkraftmaschine (1) mit einem Kraftstoffzumessystem (11), bei dem Kraftstoff von einer Vorförderpumpe (13) aus einem Kraftstoffvorratsbehälter (12) in einen Niederdruckbereich (ND) des Kraftstoffzumesssystems (11) und von einer Hochdruckpumpe (14) aus dem Niederdruckbereich (ND) in einen Hockdruckbereich (HD) des Kraftstoffzumesssystems (11) gefördert wird. In dem Hochdruckbereich (HD) mit einem Einspritzdruck (p_r) anliegender Kraftstoff wird über mindestens ein Einspritzventil (9) zumindest indirekt in einen Brennraum (4) der Brennkraftmaschine (1) eingespritzt. Der Einspritzdruck (p_r) wird geregelt. Um die Dynamik der Regelung des Einspritzdrucks (p_r) zu verbessern wird vorgeschlagen, dass der Regelung des Einspritzdrucks (p_r) mindestens eine Vorsteuerung unterlagert wird, wobei eine Vorsteuergrösse (y) mit Hilfe von mindestens einem Kennfeld (K1, K2) in Abhängigkeit von einem Betriebspunkt der Brennkraftmaschine (1) ermittelt wird.
Abstract:
The invention relates to a method and a device for calibrating a pressure sensor (7) of a fuel dosing system of an internal combustion engine. Said fuel dosing system comprises a high-pressure pump (2) that delivers fuel from a low-pressure zone (ND) to a high-pressure zone (HD). The injectors (5) that dose the fuel from the high-pressure zone (HD) into the combustion chambers (6) of the internal combustion engine are controlled according to working characteristics. The dosing system further comprises the pressure sensor (7) that measures the pressure in the high-pressure zone (HD). The aim of the invention is to calibrate the pressure sensor (7) in such a manner that the offset-error can be reduced to a minimum. To this end, the pressure in the high-pressure zone (HD) is used as a reference pressure, the pressure in the high-pressure zone (HD) is measured by the pressure sensor (7) as the sensor pressure and the characteristic line of the pressure sensor (7) is corrected in such a manner that the difference from reference pressure and sensor pressure is reduced to a minimum.