Patent ID: 7383117
Filing Date: 2008-06-03
Classification: F02D,Y02T

Abstract:
1. A method for optimizing a valve-lift changeover of a spark-ignition engine having lambda control, comprising: acquiring torque-relevant engine operating data during the valve-lift changeover; transferring the operating data to an engine management system; determining an acceleration characteristic based on the operating data; evaluating the acceleration characteristic as a measure of a quality of the valve-lift changeover; determining if an irregularity of the acceleration characteristic has occurred; and evaluating a lambda characteristic of the valve-lift changeover by correcting a cylinder charging calculation or a torque calculation if an acceleration characteristic irregularity is determined, wherein the irregularity in the acceleration characteristic is determined by evaluating a segment time based on a crankshaft signal, wherein the lambda characteristic represents an enriching, a leaning or a constant value, and wherein applying the quality of the valve-lift changeover as a measure of an error in the calculation of the cylinder charging and calculating a corrected cylinder charging if enriching or leaning has been detected.