METHOD AND DEVICE FOR MONITORING AND REGULATING THE OPERATION OF AN INTERNAL COMBUSTION ENGINE WITH REDUCED NOX EMISSIONS

摘要

The aim of the invention is to monitor and regulate an internal combustion engine (10) in such a way that said engine is regulated in a reliable manner at each working point (24), both for a lean operation and a rich operation, thus effectively reducing the NOx emissions. To achieve this, both an NOx sensor (17) and a lambda probe (18) are positioned in the exhaust gas channel (16) of the internal combustion engine, at least one regulation characteristic curve (22) that is constant over the entire range of motor regulation is formed from both the measured variables NOx content and lambda value in a mathematical relationship and if a deviation from the regulation curve occurs, a regulation electronic system (21) intervenes in the operation of the internal combustion engine (10), in particular by modifying the ratio of fuel/combustion air.