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1. (US20160312686) Crankcase ventilation pressure management for turbocharged engine

Office : United States of America
Application Number: 14694118 Application Date: 23.04.2015
Publication Number: 20160312686 Publication Date: 27.10.2016
Grant Number: 09909470 Grant Date: 06.03.2018
Publication Kind : B2
IPC:
F02B 33/44
F01M 13/04
F01M 13/02
F01M 13/00
F02B 37/00
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02
COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
B
INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
33
Engines characterised by provision of pumps for charging or scavenging
44
Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
M
LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL-COMBUSTION ENGINES; CRANKCASE VENTILATING
13
Crankcase ventilating or breathing
04
having means for purifying air before leaving crankcase, e.g. removing oil
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
M
LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL-COMBUSTION ENGINES; CRANKCASE VENTILATING
13
Crankcase ventilating or breathing
02
by means of additional source of positive or negative pressure
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
M
LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL-COMBUSTION ENGINES; CRANKCASE VENTILATING
13
Crankcase ventilating or breathing
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02
COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
B
INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
37
Engines characterised by provision of pumps driven at least for part of the time by exhaust
CPC:
F01M 13/022
F01M 13/023
F01M 13/028
F01M 13/04
F01M 13/0416
F01M 2013/0077
F01M 2013/027
F02B 37/00
Applicants: FORD GLOBAL TECHNOLOGIES, LLC
Inventors: Adam M. Christian
Christopher W. Newman
Katherine Jane Randall
Agents: Gregory P. Brown
MacMillan, Sobanski & Todd, LLC
Priority Data:
Title: (EN) Crankcase ventilation pressure management for turbocharged engine
Abstract: front page image
(EN)

A crankcase ventilation system for a turbocharged engine has full bi-directional flow for an idle state and a boosted state. A PCV valve provides air flow from the crankcase to the intake manifold in the idle state. A restriction in a first vent line limits fresh air into the crankcase in the idle state. A PCV bypass permits a one-way flow into the crankcase via a second vent line bypassing the PCV valve in the boosted state. A pressure relief valve in communication with the first vent line is configured to bypass the restriction in the boosted state when a pressure in the crankcase exceeds a threshold pressure. In a preferred embodiment, the PCV bypass is configured to bypass both the PCV valve and a pull separator (i.e., oil separator at the second vent line) in the boosted state.