Detecting vehicle misfires involves reducing valve armature kinetic energy when opening valve, detecting reduced energy, comparing with threshold, outputting comparison signal indicating misfires.

摘要

The method involves determining the kinetic energy of the armature (6c) of a gas exchange lift valve (1), reducing the kinetic energy when opening the valve by an electromagnet (6a,6b) so that the kinetic energy remains below a defined value depending on the position of the valve, detecting the reduced energy, comparing with a threshold value and outputting a comparison signal that indicates misfires. AN Independent claim is also included for the following: an arrangement for detecting misfiring in a vehicle with piston internal combustion engine with at least one cylinder.