Robert Boschgmbh

Karl-Heinz Kugler

Christian Zimmermann

Karlheinz Riedel

Walter Gollin

Oskar Torno

Richard Schleupen

Stefan Unland

Robert H Entenmann

Matthias Philipp

Arnd-Matthias Langner

Bernhard Stengel

Hans Koehnle

Ulrich Rothaar

Ernst Kaller

Hans Kohnle

Heinz-Gunter Joos

Siegfried Rhode

An ignition system is provided for internal combustion engines for detecting combustion misfirings. The ignition system of an internal combustion engine detects the spark voltage transformed on to the primary side of a double spark coil for evaluating the ignition spark duration and/or the ignition spark voltage so as to allow a comparison to be made with limit values for a correct ignition. The limit values for a correct ignition are determined from the measured variables of a reference ignition. The reference ignition is the ignition which is triggered by the energy potential of the same ignition coil.

Ignition system for internal combustion engines with misfiring detection

Ignition system for internal combustion engines

The invention relates to a method of damping abnormal vibrations or bucking of spark ignition engines by adjustment of the ignition angle, including simultaneous detection and temporary storage of a value representative of the effective or instantaneous load and, by comparing the load value against successive load values, establishing changes in the load, whereby such change in load, in case a predetermined threshold is exceeded, affects an adjustment of the effective ignition angle, with resetting of the ignition angle to the effective or characteristic field angle taking place as a function of the gradient of engine rotations.

Method of damping engine vibrations

Monitoring apparatus is provided for the ignition system of an internal combustion engine such as is provided in a motor vehicle, which is capable of detecting a variety of malfunctions of ignition under a variety of engine operating ranges, so that the catalyst used in the exhaust system of the engine can be protected by setting lambda=0 and/or cutting off fuel injection to an inoperative cylinder, in as many instances of malfunction as possible. Various methods of monitoring are available and are correlated for selection in accordance with the different operating ranges of the engine. The ignition spark duration and the ignition discharge voltage are measured for individual sparks on the primary side of an ignition coil and are compared with limit values for correct ignition, these limit values being selected from a memory in accordance with the particular range of operating conditions in which the engine is operating. If the quality of malfunction detection is not good enough for individual ignition deficiencies to be reliably detected, deficiencies that are periodically recurrent or abnormally bunched are detected on a statistical basis.

Method of monitoring an internal combustion engine ignition system by

Method and arrangement for recognizing misfires

Method of and device for monitoring combustion in a spark ignition

In order to protect catalytic converters from damage caused by continued engine operation with a malfunctioning ignition system, a monitoring circuit checks current in the ignition coil primary winding. Primary winding current (i) is transformed by a measuring circuit (11) into a test primary voltage (U.sub.pr) which is fed to an evaluation circuit for comparison with ignition system supply voltage (U.sub.v) from the battery. During each primary current pulse, an instantaneous value is sampled, preferably during the earlier half of the pulse, and when the instantaneous test voltage (U.sub.pr) exceeds the supply voltage (U.sub.v) by more than a predetermined amount, the evaluation circuit (10) generates an error or malfunction indication. The ignition system can then be serviced before the catalytic converter is ruined.

High voltage ignition system monitoring circuit

Growing community of inventors

Vaihingen, Germany

Karl-Heinz Kugler