Device for controlling the combustion air ratio in Otto gas engines with exhaust gas catalysts

摘要

In a device for controlling the combustion air ratio in Otto gas engines (1), in the exhaust pipe (2) of which an air/gas mixer (4) is arranged and in the exhaust pipe (7) of which a lambda probe (9) and, adjoining the latter, an exhaust gas catalyst (8) are provided, a g controller (11) is connected to the output of the lambda probe (9) and a control valve (12) for changing the combustion air ratio is connected to the output of said controller. In order to maintain the narrow lambda window of maximum conversion rates of the three-way catalyst for all three pollutant components NOx, CO and HC in as wide as possible an operating range of the engine in order thereby to achieve a drastic reduction in pollutant emissions, a thermocouple (10) likewise connected to the g controller (11) is provided in the exhaust pipe (7) and the g controller (11) is designed for temperature compensation of the lambda control. In particular, temperature compensation of the signal emitted by the lambda probe (9) is performed. <IMAGE>