| 摘要 |
<p>The invention relates to a method for detecting ionising current in an ignition circuit (32,33) included in the ignition system of an internal combustion engine, where a measuring voltage is applied to the ignition circuit and a measuring device (29) is utilised for detecting ionising current possibly present in the ignition circuit.</p><p>In known solutions of this kind, it has been necessary to use comparatively expensive electronic components, usually not manufactured as standard, to protect the outside voltage source from high voltages occurring in the ignition circuit. The problems are aggravated when the prior art is applied to capacitative ignition systems. The present invention solves the problems involved in an advantageous manner and is essentially distinguished in that a constant measuring voltage is applied to the earthed connection (36-39) of the ignition circuit (32,33) between a secondary winding (36-39) of the ignition circuit (32,33) between a secondary winding (30,31) in the ignition circuit and a capacitor (40) in the earth connection, and in that a possible ionising current in the ignition circuit is detected in means (50), by a signal representing the ionising current being taken off from the earth connection of the secondary winding.</p> |
