Patent ID: 6161377
Filing Date: 2000-12-19
Classification: B01D,F01N,F02D

Abstract:
An internal-combustion engine system, comprising:a combustion engine having an exhaust gas system;an emissions control device comprising an NO.sub.x storage catalyst arranged in the exhaust gas system;a first lambda probe for detecting an engine air ratio upstream of the NO.sub.x storage catalyst;a second lambda probe for detecting a catalyst air ratio downstream of the NO.sub.x storage catalyst; anddesulfurization devices for a periodic desulfurization of the NOx storage catalyst at a raised temperature and with a rich catalyst air ratio, said desulfurization devices comprising:a desulfurization control that controls the periodic desulfurization at least as a function of the catalyst air ratio of the second lambda probe; anda secondary air feeding device for feeding secondary air into the NO.sub.x storage catalyst.