EGR system with particle filter for a gasoline engine

An exhaust gas recirculation system, comprising:

• an exhaust pipe,
• an inlet pipe,
• a main exhaust gas catalytic converter located in the exhaust pipe,
• a turbine located in the exhaust pipe,
• a compressor located in the inlet pipe,
• at least one exhaust gas recirculation pipe_II, which branches at the exhaust pipe and opens into the inlet pipe, and
• at least one particle filter_II located in the exhaust gas recirculation pipe_II,
• wherein the exhaust gas recirculation pipe_II branches at least one of upstream and downstream of the main exhaust gas catalytic converter,
• wherein, when the exhaust gas recirculation pipe_II branches upstream of the exhaust gas catalytic converter, the particle filter_II has a 3/Ox coating, oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2, and
• wherein, at least one cooler_II is provided inside the exhaust gas recirculation pipe_II downstream of the particle filter, and
• wherein the exhaust gas recirculation pipe_II branches at the exhaust pipe downstream of the turbine and opens in the inlet pipe upstream of the compressor.

An exhaust gas recirculation system, comprising:

• an exhaust pipe,
• a turbine,
• an inlet pipe,
• a compressor,
• at least one exhaust gas recirculation pipe_I, which branches at the exhaust pipe upstream of the turbine and opens in the inlet pipe downstream of the compressor, and
• at least one particle filter_I, which is located in at least one of the exhaust gas recirculation pipe_I and in the exhaust pipe upstream of the exhaust gas recirculation pipe_I,
• wherein the particle filter_I has a 3/Ox-coating oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2,
• wherein the at least one particle filter_I is positioned upstream from at least one cooler_I provided inside the exhaust gas recirculation pipe_I,
• wherein at least one further exhaust gas recirculation pipe is provided, which branches at the exhaust gas recirculation pipe and opens into the inlet pipe,
• wherein, in the at least one further exhaust gas recirculation pipe, at least one further cooler is provided, and
• wherein the at least one further exhaust gas recirculation pipe opens in the inlet pipe upstream of the compressor.

An assembly, comprising:

• a gasoline engine or exhaust gas system for a gasoline engine connected to an exhaust gas recirculation system comprising:
• an exhaust pipe attached to an exhaust manifold of the gasoline engine,
• a turbine,
• an inlet pipe connected to an inlet manifold of the gasoline engine,
• a compressor,
• at least one exhaust gas recirculation pipe_I, which branches at the exhaust pipe upstream of the turbine and opens in the inlet pipe downstream of the compressor, and
• at least one particle filter_I, which is located in the exhaust gas recirculation pipe_I or in the exhaust pipe upstream of the exhaust gas recirculation pipe_I,
• wherein the particle filter_I has a 3/Ox-coating oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2,
• wherein the at least one particle filter_I is positioned upstream from at least one cooler_I provided inside the exhaust gas recirculation pipe_I,
• wherein at least one further exhaust gas recirculation pipe is provided, which branches at the exhaust gas recirculation pipe and opens into the inlet pipe,
• wherein, in the at least one further exhaust gas recirculation pipe, at least one further cooler is provided, and
• wherein the at least one further exhaust gas recirculation pipe opens in the inlet pipe upstream of the compressor.

An exhaust gas recirculation system, comprising:

• an exhaust pipe,
• an inlet pipe,
• a main exhaust gas catalytic converter located in the exhaust pipe,
• a turbine located in the exhaust pipe,
• a compressor located in the inlet pipe,
• at least one exhaust gas recirculation pipe_II, which branches at the exhaust pipe and opens into the inlet pipe, and
• at least one particle filter_II located in the exhaust gas recirculation pipe_II,
• wherein the exhaust gas recirculation pipe_II branches at least one of upstream and downstream of the main exhaust gas catalytic converter,
• wherein, when the exhaust gas recirculation pipe_II branches upstream of the exhaust gas catalytic converter, the particle filter_II has a 3/Ox coating, oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2, and
• wherein, at least one cooler_II is provided inside the exhaust gas recirculation pipe_II downstream of the particle filter, and
• wherein the exhaust gas recirculation pipe_II branches at the exhaust pipe downstream of the turbine and opens in the inlet pipe upstream of the compressor, and
• wherein a charge-air cooler is present in the inlet pipe, wherein at least one of the cooler_I inside the exhaust gas recirculation pipe_I and the charge-air cooler is configured as an exhaust gas engine cooling water cooler or as an exhaust gas low-temperature cooling water cooler, and is at least thermally separated from the particle filter.

A method for the operation of a gasoline engine connected to an exhaust gas recirculation system comprising:

• an exhaust pipe attached to an exhaust manifold of the gasoline engine,
• a turbine,
• an inlet pipe connected to an inlet manifold of the gasoline engine,
• a compressor,
• at least one exhaust gas recirculation pipe_I, which branches at the exhaust pipe upstream of the turbine and opens in the inlet pipe downstream of the compressor, and
• at least one particle filter_I, which is located in the exhaust gas recirculation pipe_I or in the exhaust pipe upstream of the exhaust gas recirculation pipe_I,
• wherein the particle filter_I has a 3/Ox-coating oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2,
• wherein the at least one particle filter_I is positioned upstream from at least one cooler_I provided inside the exhaust gas recirculation pipe_I,
• wherein at least one further exhaust gas recirculation pipe is provided, which branches at the exhaust gas recirculation pipe and opens into the inlet pipe, and
• wherein, in the at least one further exhaust gas recirculation pipe, at least one further cooler is provided, and
• wherein the at least one further exhaust gas recirculation pipe opens in the inlet pipe upstream of the compressor, the method comprising the steps of:
• a) adjusting at least one of an EGR valve and early ignition angle adjustment via a control unit to achieve an exhaust gas recirculation rate during operation, at least for an HP-EGR and at least in a high-load range and at full load, to a value of up to 20%, up to 30%, up to 40% or up to 50%, and
• b) at least one of
• i) adjusting via the control unit a combustion center of gravity closer to a thermodynamically optimum value of 8° crank angle,
• ii) reducing a fuel quantity to be delivered to the gasoline engine, and
• iii) both i) adjusting via the control unit a combustion center of gravity closer to a thermodynamically optimum value of 8° crank angle and ii) reducing a fuel quantity to be delivered to the gasoline engine and a full-load enrichment is avoided.