System and method for treating blow-by gas in a PCV system of an internal combustion engine
AssigneeHyundai Motor Company
InventorIn-Tak Kim
Life of this patent
Estimating the term…
Abstract
A system for treating blow-by gas in a PCV (positive crankcase ventilation) system of an internal combustion engine is provided, which comprises a cut-off valve assembly for selectively opening or closing an air duct, a blow-by gas collecting assembly for collecting blow-by gas inside an air intake passageway and ejecting the collected blow-by gas into an intake manifold such that the blow-by gas is re-burned in a combustion chamber, and a controller for controlling operations of the cut-off valve assembly and the blow-by gas collecting assembly.
Claims10
A system for treating blow-by gas in a positive crankcase ventilation system of an internal combustion engine, the system comprising:
- a cut-off valve assembly for selectively opening or closing an air duct;
- a blow-by gas collecting assembly for collecting blow-by gas inside an air intake passageway and ejecting the collected blow-by gas into an intake manifold such that the blow-by gas is re-burned in a combustion chamber;
- and
- a controller for controlling operations of the cut-off valve assembly and the blow-by gas collecting assembly.
A method for treating blow-by gas using a positive crankcase ventilation system of an internal combustion engine including an air duct opening/closing assembly disposed in an air duct before an air cleaner, the air duct opening/closing member selectively opening/closing the air duct;
- a pump for collecting blow-by gas from the air duct and an air intake hose, the pump being respectively connected to the air duct and the air intake hose through a first collecting hose and a second collecting hose;
- a gas reservoir for temporarily storing the collected gas, the gas reservoir being connected to the pump through a connecting hose and also being connected to the air intake hose through an ejecting hose;
- a first duty-control valve disposed in the first collecting hose;
- a second duty-control valve disposed in the second collecting hose;
- a third duty-control valve disposed in the ejecting hose;
- a first pressure sensor for detecting a pressure inside the air duct and generating a corresponding signal;
- a second pressure sensor for detecting a pressure inside the air intake hose and generating a corresponding signal;
- and a controller for controlling an operation of the pump and performing a duty-control of the first, second, and third duty-control valves on the basis of the signals input from the first and second pressure sensors and engine operating conditions, the method comprising:
- operating the pump and opening the first and second duty-control valves, if an ignition-on signal is detected;
- determining whether conditions for opening the air duct exist, the conditions including that a pressure inside the air duct is lower than atmospheric pressure and higher than a pressure inside the air intake hose, using the signals input from the first and second pressure sensors;
- opening the air duct by controlling the cut-off valve assembly if the conditions for opening the air duct exist;
- determining if an engine speed is higher than 0 rpm;
- opening the third duty-control valve if the engine speed is higher than 0 rpm;
- and
- stopping the pump and releasing duty-controls on the first and second duty-control valves.
Dependencies are inferred from the claim text.