Ventilation system for supercharged combustion engines

Patent metadata

Field	Value
Publication number	US-2016290193-A1
Application number	US-201414392381-A
Country	US
Kind code	A1
Filing date	Sep 25, 2014
Priority date	Sep 26, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

A ventilation system for a crankcase for the transport of blow-by gases from the crankcase to the intake section of an internal combustion engine with supercharger. A ventilation line reaches from the crankcase to the segment of the intake section between the supercharger and the air inlet valve. An air-oil separator is arranged in the ventilation line, as well as a return line for the return of oil separated in the air-oil separator via a tank and a tank outlet valve into the crankcase. An actuating element is arranged in or at the tank. The actuating element is charged with the pressure in the intake line behind the supercharger as working pressure and which upon sufficiently high pressure transports the oil present in the tank via the tank outlet valve into the crankcase.

First claim

1 - 10 . (canceled)

11 . A ventilation system for a crankcase for the transport of blow-by gases from the crankcase to the intake section of an internal combustion engine with supercharger and a throttle flap, comprising:
a ventilation line reaching from the crankcase to the segment of the intake section between the supercharger and the air inlet valve, an air-oil separator arranged in the ventilation line, as well as a return line for the return of oil separated in the air-oil separator via a tank and a tank outlet valve into the crankcase,
wherein an actuating element is arranged in or at the tank, said actuating element is charged with the pressure in the intake line behind the supercharger as working pressure and which upon sufficiently high pressure transports the oil present in the tank via the tank outlet valve into the crankcase.

12 . The ventilation system of claim 11 , further comprising a first check valve arranged in the ventilation line behind the air-oil separator with respect to a gas-flow direction where the actuating element is charged with the pressure in the ventilation line in ventilation direction behind the first check valve in the situation when both the supercharger is not active and the throttle flap is closed.

13 . The ventilation system of claim 11 , wherein the actuating element is returned into its original position when the pressure difference between the intake section behind the throttle flap and the crankcase changes from positive to negative.

14 . The ventilation system of claim 12 , wherein between the ventilation line behind the first check valve or the intake section behind the supercharger on the one hand and the tank on the other hand, a connection line is arranged in order to charge the actuating element with the pressure given in the ventilation line behind the first check valve.

15 . The ventilation system of claim 11 , wherein the actuating element comprises a flexible or moveable element, selected from the group consisting of a pressure piston, an elastic membrane, a rolling membrane and a bellows.

16 . The ventilation system of claim 11 , wherein at or in an inlet of the tank for separated oil, a tank inlet valve is arranged, which is closed upon sufficiently high pressure difference between the ventilation line behind the first check valve and the crankcase.

17 . The ventilation system of claim 11 , wherein the actuating element or an element comprises a valve closure of a tank inlet valve or the tank inlet valve.

18 . The ventilation system according of claim 11 , further comprising an oil-foam barrier arranged between the air-oil separator and the tank.

19 . The ventilation system of claim 18 , wherein the gas from which the oil has been separated, on its way from the air-oil separator to the intake section has to pass the oil-foam barrier twice.

Assignees

• Reinz Dichtungs Gmbh

Inventors

• Lemke Kai-Uwe
• Baerreiter Robert

Classifications

• F02M25/06 Primary

  adding lubricant vapours · CPC title

• F01M2013/027

  with a turbo charger or compressor · CPC title

• F01M13/04

  having means for purifying air before leaving crankcase, e.g. removing oil · CPC title

• F01M13/023 Primary

  Control valves in suction conduit · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title