Supercharged internal combustion engine and method for operating an internal combustion engine of said type

摘要

A supercharged internal combustion engine is provided. The engine comprises a cylinder, an intake line in an intake system, for supplying charge air to the cylinder, an exhaust line for discharging exhaust gases, an exhaust-gas turbocharger including a turbine arranged in the exhaust line and a compressor arranged in the intake line, an exhaust-gas recirculation arrangement including a recirculation line which branches off from the exhaust line downstream of the turbine and opens into the intake line upstream of the compressor, and a sensor for detecting the concentration Ci,intake of a component i of the charge air in the intake system provided downstream of the opening of the recirculation line into the intake line. In this way, the exhaust-gas recirculation may be regulated based on feedback from the sensor to control emissions.

主权项

1. A method for operating an engine with a turbocharger having a compressor and high-pressure and low-pressure exhaust as recirculation, comprising:
adjusting a low-pressure recirculation rate in a low-pressure exhaust gas recirculation line via a shut-off element in the recirculation line based on a concentration Ci,intake of a component i in charge air detected by a sensor arranged between the compressor and a downstream charge-air cooler, the concentration determining a NOx concentration in exhaust gas.