Robert Boschgmbh

Audi Ag

Anton Kantschar

Martin Klenk

Werner Haeming

Carsten Kluth

Oskar Torno

Robert Sloboda

Wolfgang Wimmer

Andreas Meinken

Kai Dierssen

Jochen Goebels

Jan Boettger

Rudi Eichhorn

Winfried Moser

Axel Heinstein

Federico Buganza

Christian Kohler

J&uuml;rgen Sauler

Stefan Kempf

Frederic Gabel

Rolf Petzendorfer

Werner Muller

Frédéric Gabel

Werner Mueller

Goetz Stelzenmueller

An apparatus for furnishing an amplified sensor signal of a knock sensor, encompassing an analog amplifier for amplifying the sensor signal in accordance with a first definable gain factor; an analog/digital converter for digitizing the amplified sensor signal into a digitized sensor signal; a digital amplifier for amplifying the digitized sensor signal in accordance with a second definable gain factor; and a control unit in order to furnish the first and the second gain factor as a function of a baseline sound level of the sensor signal, the baseline sound level corresponding to the component of the solid-borne sound signal generated in normal operation without knocking.

Knock detection system and method for an amplifier control for a knock signal

A method for computing an ignition angle of an internal combustion engine as a function of the operating conditions of the engine and knock signals K, which indicate knocking combustion in the engine. If knock occurs, the ignition angle is retarded. If knock stops for a first period, the ignition angle is advanced again. Advance of the ignition angle is limited on the basis of the first period. If knock stops for a second period, which exceeds the first period, the ignition angle is further advanced.

Method for computing an ignition angle of an internal combustion engine

A method for knock control during KC emergency operation with which, given low application expenditure, a torque gain can be attained, while the application reliability increases. The method for knock control of multi-cylinder internal combustion engines having 2 cylinders, a cylinder counter, at least one knock sensor and an evaluation unit for evaluating the knock-sensor signal with the aid of an individual knock-recognition characteristic for each cylinder, is characterized in that during KC emergency operation, cylinder pairs are formed from the cylinders operating offset in each case by 360&deg;, and the minimal value of the two knock-recognition characteristics of the cylinder pair is assumed in each case as the knock-recognition threshold for the cylinders of the cylinder pair affected by the malfunction of the phase recognition.

Method for knock control

Process for adapting mechanical tolerances of a pick-up wheel

A misfire detection system for an internal combustion engine is disclosed with the system being used to evaluate wheel rpm fluctuations. This system detects a rough roadway over which the misfire detection is to be inhibited. This detection is made with the aid of wheel rpm signals; that is, signals as they are present for all motor vehicles equipped with anti-locking brake systems and for motor vehicles which utilize the wheel rpm signal for determining road speed. In motor vehicles of this kind, the advantage is provided that the wheel rpm signal has a double use. The advantage is provided that a reliable detection of a rough roadway is possible for all motor vehicles independently of whether wheel rpm signals are used for inhibiting the misfire detection or not.

Misfire detection system for an internal combustion engine

A system for detecting multiple misfires and for allocating misfires to cylinders for detected multiple misfires in a multi-cylinder internal combustion engine is so configured that the rough-running values for the individual cylinders are determined. The system then however forms sum terms with these rough-running values and, in turn, forms sums with these sum terms which sums are compared with threshold values. When at least one sum exceeds the corresponding threshold value, then this shows the presence of multiple misfires. As soon as multiple misfires are detected, the rough-running threshold values for allocating misfires to cylinders are reduced. Advantageously, the rough-running values are so modified in advance that their correction terms are influenced as little as possible by misfires. In this way, misfires can also reliably be allocated to individual cylinders when multiple misfires are present.

System for detecting misfires in an internal combustion engine

Method for protecting a catalytic converter

Growing community of inventors

Eberdingen-Hochdorf, Germany

Anton Kantschar