| 摘要 |
A crankcase ventilation system for an internal-combustion engine with exhaust gas turbocharging, has a first vent pipe which is connected on one side with the crankcase space and on the other side with an intake pipe of the internal-combustion engine. Viewed in the flow direction, the first vent pipe leads in behind a throttle valve arranged in the intake pipe. A second vent pipe is connected on one side with the crankcase space and on the other side with the suction side of a compressor. In the first vent pipe, a return valve is arranged which, in a supercharging pressure operation of the internal-combustion engine, prevents that the excess pressure existing in the intake pipe spreads over into the crankcase space. A return valve is arranged in the second vent pipe and the vacuum level for both vent pipes can be adjusted by way of a common pressure regulator. As a result, it is ensured in the case of the crankcase ventilation system in the supercharging pressure operation as well as in the intake operation of the internal-combustion engine that the vacuum in the crankcase space can be adjusted and in the intake operation of the internal-combustion engine, no bypass air arrives behind the throttle valve by way of the suction side of the compressor.
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