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Exhaust-gas recirculation (EGR) is a known technique for reducing the NOx emission of combustion engines. In the case of EGR, some of the exhaust gases are fed back to the inlet of the engine. A problem in the case of exhaust-gas recirculation is the metering of the quantity of exhaust gas in the inlet duct. This determines the emission of the respective internal combustion engine. In order to limit the NOx discharge, sufficient exhaust gas has to be recirculated. On the other hand, an unduly large addition has the consequence that the power of the internal combustion engine is adversely affected if this is at the expense of the quantity of air. With an excess EGR flow, the particle emission also increases.
The present invention provides an internal combustion engine which has a high efficiency and in which a complicated regulating system is unnecessary for controlling the quantity of recirculated gas in the inlet duct.
Reducing the NOx emission of combustion engines.
In the combustion engine the turbine is designed as a turbine with variable geometry. It is so designed that, when the exhaust back-pressure increases as a result, the work performed by the turbine and compressor increases. The consequence thereof is that the compressor rotary speed and the inlet manifold pressure rise, as a result of which the decrease in the air flow as a consequence of the space occupied by the EGR gas is minimized or eliminated. In this situation, the air excess factor remains at a good level, as a result of which the smoke emission does not increase and the efficiency is affected as little as possible.
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