Internal combustion engine has two exhaust gas turbochargers with different turbo braking factors; the turbo braking factor of the smaller one is at maximum half that of the larger one.

摘要

The engine (1) has at least one variable geometry exhaust gas turbine (9) enabling variable setting of the effective turbine cross-section, whereby the two turbochargers (2,10) have different operating characteristic fields and are connected in series. The turbo braking factor for maximum engine braking power is given by the product of the free cross-section in the exhaust gas path to the turbine at maximum braking power and the turbine wheel entry dia. divided by the engine stroke vol. The turbochargers have different turbo braking factors; the factor of the smaller one (10) is at maximum half that of the larger one (2). An Independent claim is also included for a method of operating an internal combustion engine with two exhaust gas turbochargers