Supercharged internal combustion engine and method for operating an internal combustion engine of said type
First Claim
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.
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Accused Products
Abstract
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.
36 Citations
12 Claims
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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. - View Dependent Claims (2)
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3. A method for operating a supercharged internal combustion engine including both an LP-EGR and HP-EGR system, comprising:
adjusting an LP-EGR valve based on an oxygen concentration in charge air detected by an intake system sensor upstream of a charge-air cooler and downstream of a compressor, and adjusting an HP-EGR valve based on estimated HP-EGR flow when both the LP-EGR and HP-EGR systems are enabled. - View Dependent Claims (4, 5)
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6. A supercharged internal combustion engine, comprising:
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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 a concentration Ci,intake of a component i of the charge air in the intake system provided downstream of an opening of the recirculation line into the intake line, wherein a charge-air cooler is provided in the intake line downstream of the compressor, wherein the cylinder has at least one inlet opening, and wherein in an installed position of the internal combustion engine, the charge-air cooler is arranged above the at least one inlet opening of the cylinder, wherein a geodetic height in the intake system decreases continuously in a flow direction proceeding from an inlet of the charge-air cooler into the charge-air cooler toward the at least one inlet opening of the cylinder, wherein the sensor is arranged between the compressor and the charge-air cooler. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification