| 摘要 |
The invention relates to a method for optimizing engine braking in a drive unit, particularly used for motor vehicles, comprising an internal combustion engine consisting of a crankshaft, and an exhaust gas turbine which is connected to a crankshaft via a transfer device. A hydrodynamic coupling is arranged in the transfer device. The invention is characterized by the following features: in one operational state corresponding to braking operation with an engine brake, the exhaust gas is operated at a working point which is characterized by the maximum acceptable limiting speed nmax-5 of the exhaust gas turbine at a minimum output moment M5 and in another operational state corresponding to the partial load operation or thrust operation, the exhaust gas turbine is operated at a working point which is characterized by a minimum speed nmin5 and minimum receivable moment Mmin-5, wherein adjustment of both working points is carried out by the hydrodynamic coupling, such that it can be operated according to at least one characteristic whose transferable moment corresponds to the minimum outputtable or receivable moment MMin-5 of the exhaust gas turbine over a large part of the speed difference characterizing the slip range taking into account the multiplication of the transfer elements in the transfer device to the exhaust gas turbine. |
