Intake manifold drain assembly of engine

Abstract

The invention discloses an intake manifold drain assembly of an engine. The intake manifold drain assembly comprises a drain pipe, an oil separator and a controlled check valve; the drain pipe is connected to the bottom of a manifold chamber; the oil separator is connected to an engine cylinder block; the drain pipe is connected to the oil separator by the aid of the controlled check valve; and the controlled check valve is configured to allow liquid and gas inside the manifold chamber to flow into the oil separator and control the flow passing the controlled check valve to be lower than the threshold flow.

Description

technical field [0001] The present invention relates to an intake manifold drain assembly in an intake system of an engine, in particular to an intake manifold for discharging oil in the intake manifold drain assembly with a controlled flow rate pipe discharge system. Background technique [0002] Some internal combustion engines include a positive crankcase ventilation (PCV) system for routing gases in the crankcase (ie, PCV gases) to the engine's intake manifold. Some engines further include a water-cooled charge air cooler (WCAC) positioned in the intake manifold. The fins and plates of the WCAC can act as separators to separate oil droplets from incoming air and oil droplets from PCV gas. The separated oil accumulates at the bottom of the intake manifold and will reach a critical amount. When the accumulated oil exceeds a critical amount, the oil will enter the combustion chamber when the driver operates the vehicle at deep acceleration, which may cause abnormal combu...

AI Technical Summary

Problems solved by technology

When the accumulated oil exceeds a critical amount, the oil will enter the combustion chamber when the driver operates the vehicle at deep acceleration (deepacceleration), which may cause abnormal combustion (eg, pre-ignition) and may cause damage to the piston

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