1. A method for lambda regulation in a lambda regulator of an internal combustion engine having an integrator in which the regulating data is controlled between at least two switchover periods of a lambda sensor in accordance with operating parameters such as load, rpm and time, comprising the steps of, continuously optimizing the integrator slope of the lambda regulator according to at least a time-dependent function wherein the integrator slope is dependent upon at least one of an integrator slope during a previous switchover period prior to the last switchover period of said lambda sensor and the time period of a previously elapsed switchover period prior to the last switchover period of said lambda sensor, and switching over said integrator.