Pump driven crankcase ventilation system
AssigneeFord Global Technologies, LLC
InventorsShuya Shark Yamada, Shawn Spannbauer
Life of this patent
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Abstract
Engines and engine systems for managing blow-by gas and/or moisture therein, and methods of operating the same are disclosed. The engine systems may include an air intake system including a compressor such as a turbocharge and a charge air cooler. The engine system may also include an engine such as combustion engine have a crankcase. During combustion blow-by gas may be captured in the crankcase and recirculated back to the air intake system. The blow-by gas may be diluted by additional air such as fresh air prior to being recirculated. The system may also include a pump to facilitate recirculation.
Claims17
An engine system comprising:
- an air intake system having a charge air cooler;
- an engine downstream of the charge air cooler and having a crankcase and an intake manifold connecting the air intake system to the engine;
- a first passage from the crankcase to the air intake system, the first passage connecting to the air intake system downstream of the charge air cooler;
- a second passage from the air intake system to the crankcase, the second passage configured to deliver fresh air to the crankcase for diluting blow-by gas contained within the crankcase and resulting from gas travelling around a cylinder head of the engine, and creating positive crankcase ventilation during operation;
- a pump disposed in the first passage and configured to remove the diluted blow-by gas from the crankcase and pump it to a downstream portion of the air intake system that is downstream of the charge air cooler.
An engine comprising:
- an intake manifold configured for receiving air from an air intake system;
- an engine block connected to the intake manifold;
- and
- a crankcase connected to the engine block opposite the intake manifold, the crankcase having a fresh air inlet and an outlet such that the fresh air inlet is configured to receive fresh air direly from the air intake system during operation to dilute blow-by gas obtained from gas that leaks past a piston head during combustion and provides positive crankcase ventilation, the outlet configured to be connected to a pump for pumping the blow-by gas into the air intake system downstream of a charge air cooler.
A method of managing blow-by gases comprising:
- receiving air into an air intake system;
- providing condensed air by condensing the air with a compressor;
- providing cooled condensed air by cooling the condensed air with a charge air cooler;
- receiving the cooled condensed air in an engine;
- capturing blow-by gas that slips past a cylinder head from the engine in a crankcase during combustion;
- separating oil from the blow-by gas;
- and
- pumping via a pump diluted blow-by gas into the air intake system from the crankcase via a first passage by diluting the blow-by gas with additional air received from a second passage, the first passage connecting the crankcase to the air intake system downstream of the charge air cooler and the second passage connecting air intake system upstream of the charge air cooler to the crankcase.
Dependencies are inferred from the claim text.