08-11-2018 дата публикации
Номер: US20180320579A1
Принадлежит:
SCANIA CV AB
A four stroke internal combustion engine is disclosed comprising at least one cylinder arrangement, an exhaust conduit, and at least one turbine. The cylinder arrangement comprises an exhaust port arrangement configured to open and close an exhaust flow area, A. The cylinder arrangement has a maximum volume, V. The exhaust conduit extends between the exhaust flow area, A, and a turbine wheel inlet area, A, of the turbine and has an exhaust conduit volume, Vthat is ≤0.5 times the maximum volume, V. The exhaust port arrangement is configured to expose the exhaust flow area, A, at a size of at least 0.22 times the maximum volume, V, when a piston of the cylinder arrangement is at the bottom dead centre, BDC. 1. A four stroke internal combustion engine comprising:at least one cylinder arrangement;an exhaust conduit; and{'sub': TIN', 'CYL, 'a turbine comprising a turbine wheel, the turbine having a turbine wheel inlet area, A, wherein the at least one cylinder arrangement forms a combustion chamber and comprises a piston arranged to reciprocate in a cylinder bore and an exhaust port arrangement, the exhaust port arrangement being configured to open and close an exhaust flow area, A, during an exhaust sequence of the piston reciprocation,'}{'sub': 'MAX', 'wherein the cylinder arrangement has a maximum volume, V, between a bottom dead centre, BDC, of the piston and an upper inner delimiting surface of the combustion chamber,'}{'sub': CYL', 'TIN', 'EXH', 'MAX, 'wherein the exhaust conduit extends between the exhaust flow area, A, and the turbine wheel inlet area, A, and has an exhaust conduit volume, V, is ≤0.5 times a maximum volume, V,'}{'sub': TURB', 'MAX', 'TURB', 'TIN', 'TOT', 'RED', 'TOT', 'TURB', 'RED, 'sup': −1', 'X', '1/2, 'wherein the turbine has a normalized effective flow area, γ, defined as γA/V, wherein γ>0.22 m, wherein A=(A/A)*m′*(R/(κK(2/(κ+1)))), wherein X=(κ+1)/(κ−1), wherein Ais a total inlet area of the turbine, and wherein Ais obtained at a reduced ...
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