Method and device for operating an internal combustion engine with exhaust gas recirculation

Abstract

The invention relates to a method for operating an internal combustion engine (2) with an exhaust gas-driven supercharging device (6), the method comprising the following steps: - Implementing an exhaust gas recirculation control for adjusting the recirculation to the intake system (4 ) and / or implement a boost pressure regulation for adjusting the boost pressure on the basis of the corresponding nominal value; - detect a rapid increase in the torque requirement; and - upon detection of said torque In the event of a rapid increase in the torque requirement, the setpoint values ​​of the exhaust gas recirculation control and / or the boost pressure control are corrected in order to increase the exhaust gas enthalpy provided at the booster device ( 6 ).

Description

technical field [0001] The invention relates to an internal combustion engine, in particular a fuel-using internal combustion engine with an exhaust gas recirculation system. Furthermore, the invention relates to measures for reducing pollutant emissions during dynamic operation of a supercharged internal combustion engine. Background technique [0002] For the operation of fuel-based internal combustion engines, in particular diesel engines, legal requirements for limiting the emission of pollutants must be taken into account. In particular the recirculation of combustion exhaust gases represents an important measure when implementing these requirements. [0003] Exhaust gas recirculation (AGR) basically serves to reduce the oxygen content in the cylinders of the internal combustion engine and thereby reduce the temperature generated by combustion. The generation of nitrogen oxides can thus be reduced or prevented. However, the exhaust gas recirculation leads to the gene...

AI Technical Summary

Problems solved by technology

For systems with only one high-pressure exhaust gas recirculation system or for operating states in which the exhaust gas recirculation system is decisively determined by the high-pressure exhaust gas recirculation system, the resulting boost pressure, the resulting additional Worsening conditions can limit the maximum possible injection quantity of fuel and thus lead to a slower increase in torque

Delayed boost pressure build-up via exhaust gas recirculation control thus leads to a marked deterioration of pollutant emissions during dynamic operation and may lead to a reduction in torque dynamics (Drehmomentdynamik)

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