Crankcase ventilation via crankcase pulsation

摘要

Systems and methods for ventilating crankcase gases in a crankcase ventilation system via crankcase pressure pulsations are disclosed. In one example approach, a method comprises driving flow of crankcase ventilation gases through a crankcase of the engine from a fresh air inlet of the crankcase to an outlet of the crankcase via crankcase pressure pulsations while restricting backflow of crankcase ventilation gases from the outlet to the inlet, where the inlet and outlet are coupled upstream of an intake throttle of the engine.

主权项

1. A method, comprising:
driving crankcase ventilation gas flow through an engine crankcase from a crankcase fresh air inlet to a crankcase fresh air outlet and then to an engine intake upstream of a turbocharger compressor via crankcase pressure pulsations, while restricting crankcase ventilation gas backflow from the outlet to the inlet via a unidirectional check valve, the inlet coupled to the engine intake upstream of the turbocharger compressor, the compressor arranged upstream of a throttle, the inlet further coupled to a pulsation-restricted zone of the crankcase, and the outlet coupled to the engine intake via only a single conduit, and the single conduit couples the outlet to the engine intake upstream of the turbocharger compressor, the outlet further coupled to a pulsation zone of the crankcase, and the unidirectional check valve disposed in the outlet upstream of the single conduit.