Patent ID: 9441562
Filing Date: 2016-09-13
CPC Classification: F02D

Claim Text:
1. A method for operating an internal combustion engine having an exhaust gas purifying device, comprising: determining an oxygen filling state of an oxygen storage of a catalytic converter of the exhaust gas purifying device by way of a first lambda signal provided by a first lambda probe and an offset value, said first lambda probe being constructed as a broadband lambda probe and arranged upstream of the catalytic converter in an exhaust gas stream conductible through the catalytic converter; when a second lambda signal provided by a second lambda probe arranged in the exhaust gas stream downstream of the catalytic converter falls below a lower lambda signal threshold, setting the oxygen filling state to a first value corresponding to an empty oxygen storage and/or when the second lambda signal exceeds a upper lambda signal threshold setting the oxygen filling state to a second value corresponding to a full oxygen storage, said second lambda probe being constructed as a binary lambda probe; immediately after setting the oxygen filling state to the first value or the second value regulating the oxygen filling state during at least one regulation time period to a target filling state; and after expiration of the regulation time period adjusting the offset value by way of the second lambda signal.