US 12,241,403 B2
Charging system of an internal combustion engine
Elias Chebli, Aidlingen (DE); and Donatus Wichelhaus, Goeppingen (DE)
Assigned to Dr. Ing. h. c. F. Porsche AG, Stuttgart (DE)
Filed by Dr. Ing. h.c. F. Porsche Aktiengesellschaft, Stuttgart (DE)
Filed on Oct. 12, 2023, as Appl. No. 18/379,243.
Claims priority of application No. 10 2022 126 859.4 (DE), filed on Oct. 14, 2022.
Prior Publication US 2024/0125267 A1, Apr. 18, 2024
Int. Cl. F02B 37/00 (2006.01); F02B 29/04 (2006.01)
CPC F02B 37/004 (2013.01) [F02B 29/0406 (2013.01); F02B 29/0481 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A charging system (20) for an internal combustion engine (10) having at least one cylinder (12), comprising:
a first energy recovery turbine (25) and a second energy recovery turbine (26) connected in parallel to one another and connected to the at least one cylinder (12) so that an exhaust gas mass flow (45) discharged from the at least one cylinder (12) is divided with selected proportions of the exhaust gas mass flow (45) being directed respectively to the first and second energy recovery turbines (25, 26);
a compressor (22) connected to the first energy recovery turbine (25) by a first shaft (31), the compressor (22) compressing intake air (41) and producing compressed air (42) at a pressure that is higher than a required boost pressure of a boost air (44) when the at least one cylinder (12) is being filled;
a boost air cooler (23) that cools the air (42) compressed by the compressor (22) and thereby produces cooled air (43);
a cooling turbine (24) connected to the second energy recovery turbine (26) by a second shaft (32), the cooling turbine (24) receiving the cooled air (43) directly from the boost air cooler (23) and further cooling and expanding the cooled air (43) to the required boost pressure and directing the cooled and expanded cooled air (43) directly to the at least one cylinder (12); and
wherein an end of the second shaft (32) on a side of the cooling turbine (24) remote from the second energy recovery turbine (26) is coupled to at least one energy sink.