Working Principle of Active and Passive Oil-Gas Separators
The passive oil-gas separator is a traditional unpowered structure. It relies on the negative pressure generated by the engine intake manifold and turbocharger to extract crankcase blow-by gas, and realizes oil-gas separation through gravity, inertia and filter screen interception. Its negative pressure fluctuates with engine speed and operating conditions, resulting in a significant drop in separation efficiency at idling and low speeds. This easily causes blow-by gas leakage, oil seepage and exhaust emission, making it difficult to meet stringent emission standards.
The active oil-gas separator is equipped with an independent motor drive system and operates independently of engine working conditions to actively extract crankcase gas throughout the operation. Adopting an intelligent closed-loop pressure control system, it maintains a constant negative pressure inside the crankcase at all times. Combined with the dual structure of centrifugal separation and precision filtration, it maintains high separation efficiency under all working conditions. It thoroughly eliminates exhaust leakage and engine oil loss, stably meets China VI and higher stringent emission regulations, and is applicable to various gasoline and diesel engines.
With the advancement of the times, the reduction in the particle size of engine oil contaminants has placed higher demands on the efficiency of oil-air separators.
The traditional crankcase ventilation system relies on the vacuum generated by the turbocharger or intake manifold to draw crankcase gases into the oil-air separator. The power source for generating this vacuum directly depends on engine speed and operating conditions.
The active oil-air separator developed by Liuzhou Risun Filter Company no longer relies on engine speed or operating conditions. Instead, it is motor-controlled, actively pumping crankcase gases at all times to maintain a consistent negative pressure within the crankcase. This ensures that no gases are released into the atmosphere.