Crankcase ventilation apparatus

Patent metadata

Field	Value
Publication number	US-2016138442-A1
Application number	US-201514941227-A
Country	US
Kind code	A1
Filing date	Nov 13, 2015
Priority date	Nov 14, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

A vehicle may include an internal combustion engine having a crankcase and a supercharging apparatus, and a crankcase ventilation apparatus having at least one oil-separating apparatus including at least one oil separator. An oil return line may communicate separated oil from the crankcase ventilation apparatus to the crankcase. An ejector pump may be driven via a compressed air flow of the supercharging apparatus and may be configured to generate an underpressure for driving a blow-by gas. The crankcase ventilation apparatus may include a pump control valve configured to at least one of regulate and control the compressed air flow through the ejector pump.

First claim

1 . A vehicle, comprising:
an internal combustion engine including a crankcase and a supercharging apparatus, a crankcase ventilation apparatus including at least one inertia-based oil-separating apparatus having at least one inertia-based oil separator, an oil return communicating separated oil from the crankcase ventilation apparatus to the crankcase, and an ejector pump driven via a compressed air flow of the supercharging apparatus and configured to generate an underpressure for driving a blow-by gas, wherein the crankcase ventilation apparatus further includes a pump control valve configured to at least one of regulate and control the compressed air flow through the ejector pump, the pump control valve including a closure part arranged force-loaded against a valve seat via a biasing force, wherein the closure part is displaced away from the valve seat counter to the biasing force to open the pump control valve in response to at least one of a pressure difference between a valve inlet and a valve outlet exceeding a pressure difference threshold and an inlet-side pressure of the ejector pump exceeding an inlet-side pressure threshold.

2 . The vehicle according to claim 1 , wherein the pump control valve is an own-medium-actuated valve.

3 . The vehicle according to claim 1 , wherein the biasing force is at least one of a spring force, a magnetic force and a pneumatic pressure force.

4 . The vehicle according to claim 1 , wherein the pump control valve is a proportional valve adjustable between a closed position closing the pump control valve and a passage position opening the pump control valve.

5 . The vehicle according to claim 1 , wherein the oil-separating apparatus defines a flow cross section and includes a plurality of work areas,
wherein a first work area of the plurality of work areas has a flow cross section that is constant, wherein a second work area of the plurality of work areas has a flow cross section that increases with increasing pressure difference between an inlet and an outlet of the oil-separating apparatus, and wherein a third work area of the plurality of work areas has a flow cross section that increases less sharply with increasing pressure difference than in the second work area.

6 . The vehicle according to claim 1 , wherein the oil-separating apparatus includes at least two inertia-based oil separators and a control apparatus configured to switch between the at least two oil separators in response to a power output of the ejector pump.

7 . The vehicle according to claim 1 , wherein at least one of:
the at least one oil separator is configured as an impactor, and the at least one oil separator is configured as a cyclone.

8 . The vehicle according to claim 1 , wherein the at least one oil separator includes a poppet valve loaded via a reference pressure forcing the poppet valve in a closing direction.

9 . The vehicle according to claim 8 , wherein the at least one oil separator further includes a membrane against which the reference pressure bears, and wherein the poppet valve is loaded via the reference pressure bearing against the membrane.

10 . The vehicle according to claim 8 , wherein the reference pressure is an ambient pressure.

11 . The vehicle according to claim 8 , wherein the reference pressure is a boost pressure of the supercharging apparatus.

12 . The vehicle according to claim 8 , wherein the reference pressure is pressure on an inlet-side of the ejector pump.

13 . The vehicle according to claim 1 , wherein the crankcase ventilation apparatus further includes a throttle valve configured to throttle the blow-by gas.

14 . The vehicle according to claim 13 , wherein at least one of:
the throttle valve is arranged in a flow path of the blow-by gas between the crankcase and the oil-separating apparatus, and the throttle valve is arranged in a flow path of the blow-by gas between the oil-separating apparatus and the ejector pump.

15 . The vehicle according to claim 1 , wherein the oil-separating apparatus includes at least two inertia-based oil separators.

16 . The vehicle according to claim 15 , wherein the at least two inertia-based oil separators are configured as at least one of an impactor separator and a cyclone separator.

17 . The vehicle according to claim 2 , wherein the biasing force is at least one of a spring force, a magnetic force and a pneumatic pressure force.

18 . The vehicle according to claim 2 , wherein the pump control valve is a proportional valve continually adjustable between a closed position closing the pump control valve and a passage position opening the pump control valve.

19 . The vehicle according to claim 9 , wherein the reference pressure is a boost pressure of the supercharging apparatus.

20 . A crankcase ventilation system for an internal combustion engine having a crankcase and a supercharging device, comprising:
a crankcase ventilation apparatus including at least one inertia-based oil-separating apparatus having at least one inertia-based oil separator; an oil return line communicating separated oil from the crankcase ventilation apparatus to the crankcase; and an ejector pump driven via a compressed air flow of the supercharging apparatus and configured to generate an underpressure for driving a blow-by gas; wherein the crankcase ventilation apparatus further includes a pump control valve configured to at least one of regulate and control the compressed air flow through the ejector pump, the pump control valve including a valve inlet, a valve outlet a closure part and a valve seat, wherein the closure part is arranged in the pump control valve in a force-loaded configuration against the valve seat, and wherein the closure part is displaced away from the valve seat counter to a biasing force of the force-loaded configuration to open the pump control valve in response to at least one of a pressure difference between the valve inlet and the valve outlet exceeding a pressure difference threshold and an inlet-side pressure of the ejector pump exceeding an inlet-side pressure threshold; and wherein the at least one oil separator includes a poppet valve, the poppet valve including a poppet valve inlet and a poppet valve outlet, wherein the poppet valve is configured pre-loaded in a closing direction forcing the poppet valve in a closed position closing the poppet valve outlet, and wherein the poppet valve is adjustable to an open position in response to a pressure difference between the poppet valve inlet and the poppet valve outlet exceeding a second pressure difference threshold.

Assignees

• Mahle Int Gmbh

Inventors

• An Dimitri
• Beez Steve
• Coelho Armando
• Elsaesser Alfred
• Fallscheer Thomas
• Kirschner Volker
• Riemay Thomas
• Ruppel Stefan

Classifications

• F01M13/04

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

• F02D23/00

  Controlling engines characterised by their being supercharged · CPC title

• F01M13/021 Primary

  of negative pressure · CPC title

• F01M2013/005

  having one or more deoilers · CPC title

• F01M2013/026

  with pumps sucking air or blow-by gases from the crankcase · CPC title