Method of maintaining optimum operating conditions in motor vehicle internal combustion engine exhaust catalyst involves controlling oxygen inlet valve to prevent feed to catalyst during cleaning

摘要

The method of maintenance of optimum conditions in a motor vehicle internal combustion engine catalyst (KAT) during an unfired operating phase such as during cleaning involves controlling an oxygen inlet valve for the intake so that the oxygen feed to the catalyst is at least partially prevented. The valve used can be a variable inlet (EV) or exhaust (AV) valve of at least one combustion chamber. Alternatively, the valve can be a control valve (SV) in the oxygen feed duct.