Robert Boschgmbh

Klaus Heck

Gunther Plapp

Manfred Mezger

Stefan Huwig

Rudiger Jautelat

Botho Zichner

Jurgen Kurle

Gunter Plapp

Otto Sprenger

A temperature-dependent base desired value for the opening angle is determined in a method for precontrolling the opening angle of a throttle flap during the idle engine-speed control of an internal combustion engine. This temperature-dependent base desired value is then modified within a start-time duration. The modification takes place in that, during start, a temperature-dependent angle increase is determined which is multiplied by a time-reduced multiplier factor and the product is additively superposed on the base desired value. With this procedure, and notwithstanding the simple method sequence, it is ensured that the start phase of a warm internal combustion engine takes place without engine-speed increases. It is especially advantageous to modify additional engine-speed base desired values in a corresponding manner. In this case, hardly any additional measures must be undertaken which go beyond those which must be undertaken to modify the base desired value for the opening angle of the throttle flap. For cold starts, an increase of the engine speed is obtained in the start phase without the danger being present that the increase takes place for warm engines.

Method and arrangement for the idle closed-loop control of an internal

Control process and apparatus, in particular lambda control

Malfunction test procedure and apparatus for idling control

The invention is directed to a method for the adaptation of mixture control for an internal combustion engine which is set up from operating quantities of the engine such as throttle flap angular position .alpha. and rotational speed n. The characteristic field provides a precontrol quantity governing the quantity of fuel to be metered or injected. The method includes the steps of: influencing the precontrol quantity by at least one adaptively changeable corrective quantity (structural adaptation, global adaptation); detecting the negative change velocity (-d.alpha./dt) of the throttle flap position angle (.alpha.); comparing the negative change velocity (-d.alpha./dt) with a predetermined threshold value [-d.alpha./dt(SchAd)]; evaluating a quantity (.DELTA..alpha.) indicative of the throttle flap change in angular position when the threshold value [-d.alpha./dt(SchAd)] is exceeded, the quantity (.DELTA..alpha.) being so evaluated that the mixture adaptation in the precontrol region is inhibited for a predetermined period of time when a corresponding threshold value is exceeded. The invention is also directed to an arrangement for carrying out the above method.

Method and arrangement for adapting the mixture control of an internal

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Hohenacker, Germany

Klaus Heck