Crankcase Ventilation Device Backflow Prevention
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Solution Overview
Problem
The contamination of the intake system and engine deterioration due to backward flow of blow-by gases in crankcase ventilation systems, leading to sludge generation and potential engine failure.
Innovation Solution
A crankcase ventilation device with a fresh air inflow control valve and pressure control valve, including a nozzle and diaphragm, which prevents backward flow of blow-by gases by controlling pressure and using an oil separator to manage blow-by gas recirculation, ensuring that blow-by gases are reintroduced into the intake manifold for re-burning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a PCV valve is mounted to recirculate and re-burn blow-by gas, then blow-by gas is reduced and environmental contamination is minimized, but blow-by gas flows backwards to the fresh air inflow hose causing intake system contamination and engine deterioration
Solution Approach 1:
A check valve is introduced as an intermediary component in the fresh air inflow hose to prevent backward flow of blow-by gas. This check valve allows fresh air to flow into the crankcase while blocking the reverse flow of contaminated blow-by gas, thus protecting the intake system without compromising the PCV system's ability to recirculate and re-burn blow-by gas
2Stress or pressure
If the crankcase pressure rises excessively during blow-by gas recirculation, then blow-by gas is forced into the fresh air hose causing sludge generation and engine failure, but reducing pressure control may compromise ventilation effectiveness
Solution Approach 1:
The check valve is installed in advance in the fresh air inflow hose to prevent the harmful backward flow of blow-by gas before it can cause sludge generation and engine damage. This preliminary protective measure ensures that even when crankcase pressure rises excessively, the contaminated gas cannot enter the intake system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents engine deterioration and intake system contamination by effectively managing blow-by gas flow, minimizing the risk of sludge formation and engine failure through controlled recirculation and re-burning of blow-by gases.
Implementation Method 1
a diaphragm (312) is situated on the lower side of the nozzle (311) to prevent backward flows of a blow-by gas to the fresh air inflow hose (220)
Implementation Method 2
an oil separator (330) communicated with the pressure control valve (320) to separate oil particles from the blow-by gas discharged from the crank case (400)
Implementation Method 3
a nozzle (311) is situated in the interior of the fresh air inflow hose (220) of the fresh air inflow control valve (310), and the nozzle (311) controls inflows of the fresh air into the crankcase (400) according to a control of the pressure in the crankcase (400)
Data Source
AI summary
The present invention relates to a crankcase ventilation device for a vehicle and, more specifically, to a crankcase ventilation device for a vehicle, which: prevents a back flow of blow-by gas to a new air inflow valve according to a rise in pressure and a rise in a flow rate inside a crankcase; prevents deterioration in the inside of an engine due to unburned fuel contained in the blow-by gas and minute particles of engine oil, generation of sludge, and an engine failure; and minimizes contamination of an intake system by providing a new air inflow control valve having a nozzle and a diaphragm, so as to block a back flow of the blow-by gas to a new air inflow hose due to an excessive rise in pressure inside the crankcase during a process for re-circulating and re-burning the blow-by gas discharged from the crankcase of the vehicle.