Equalizing process for Lambda values of engine cylinders involves use of measurable value upstream of catalytic converter through which exhaust gas passes

The equalizing process involves the continuous measurement of an exhaust gas parameter in part of the exhaust through which the gases from all cylinders (Z1 Z2 Z3 Z4) of the engine (10) pass in order to determine an equalizing lambda value. The exhaust gas parameter is a measurable value of the exhaust gas upstream of a catalytic converter (24) through which the exhaust gas passes.