Internal combustion engine having a low-pressure exhaust-gas recirculation

An engine configuration, comprising:

• an internal combustion engine configured as a diesel engine, said diesel engine including:
• an exhaust-gas tract;
• a supply system for combustion air;
• an exhaust-gas turbocharger including a turbine and a compressor, said turbine being disposed in said exhaust-gas tract, said compressor being disposed in said supply system for combustion air;
• a first particulate filter disposed in said exhaust-gas tract;
• an adjustable exhaust-gas throttle disposed in said exhaust-gas tract;
• said turbine, said first particulate filter, and said adjustable exhaust-gas throttle being disposed in series in a downstream direction in said exhaust-gas tract;
• a low-pressure exhaust-gas recirculation line branching off from said exhaust-gas tract downstream of said first particulate filter and discharging into said supply system for combustion air upstream of said compressor;
• an exhaust-gas recirculation cooler disposed in said low-pressure exhaust-gas recirculation line;
• an exhaust-gas recirculation valve disposed in said low-pressure exhaust-gas recirculation line;
• and
• a second particulate filter disposed in said low-pressure exhaust-gas recirculation line, said second particulate filter having a filter mesh size of at least 50 μm such that said second particulate filter allows particles with a diameter of less than the filter mesh size to pass and holds back particles with a diameter of at least the filter mesh size, wherein said internal combustion engine is configured such that a temperature in said second particulate filter does not exceed 800° C.

An internal combustion engine, comprising:

• an exhaust-gas tract;
• a supply system for combustion air;
• an exhaust-gas turbocharger including a turbine and a compressor, said turbine being disposed in said exhaust-gas tract, said compressor being disposed in said supply system for combustion air;
• a first particulate filter disposed in said exhaust-gas tract;
• an adjustable exhaust-gas throttle disposed in said exhaust-gas tract;
• said turbine, said first particulate filter, and said adjustable exhaust-gas throttle being disposed in series in a downstream direction in said exhaust-gas tract;
• a low-pressure exhaust-gas recirculation line branching off from said exhaust-gas tract downstream of said first particulate filter and discharging into said supply system for combustion air upstream of said compressor;
• an exhaust-gas recirculation cooler disposed in said low-pressure exhaust-gas recirculation line;
• an exhaust-gas recirculation valve disposed in said low-pressure exhaust-gas recirculation line;
• and
• a second particulate filter disposed in said low-pressure exhaust-gas recirculation line, said second particulate filter having a filter mesh size of at least 50 μm such that said second particulate filter allows particles with a diameter of less than the filter mesh size to pass and holds back particles with a diameter of at least the filter mesh size, wherein said second particulate filter is configured such that a differential pressure across said second particulate filter is less than 50 mbar at an exhaust-gas quantity of 80 kg/h through said second particulate filter.