Patent ID: 6572501
Filing Date: 2003-06-03
Classification: F01L,F16H

Abstract:
A method for reducing vibrations of a control chain in a camshaft drive of an internal combustion engine by means of a chain tensioner, said chain tensioner being controlled by an electronic control system and applying a tensioning force on said control chain, said electronic control system be operatively connected to at least one sensor for measuring at least one engine parameter of said internal combustion engine, comprising the following steps:determining said vibrational state of said internal combustion engine from said measured at least one engine parameter, adjusting said tensioning force generated by said chain tensioner depending on said determined vibrational state to reduce said vibrations of said control chain, measuring at least one of the engine speed and the engine torque, wherein said step of adjusting said tensioning force comprises the step of changing said tensioning force if said engine speed and a resonance frequency of said control chain are in a harmonic relationship.