What does PCV mean on a car?

[Grace]

PCV on a car stands for Positive Crankcase Ventilation. Here is an introduction to PCV: 1. Introduction: The PCV valve, or Positive Crankcase Ventilation, means the active ventilation control system for the crankcase (or oil pan) in Chinese. It is a metering control valve installed between the engine crankcase ventilation system and the intake system. 2. Components: The PCV system mainly consists of ventilation hoses and the PCV valve. Typically, one ventilation hose connects the air cleaner to the valve cover, while another connects the PCV valve to the intake manifold. The PCV valve is composed of a plunger-type valve and a spring, located on one side of the intake manifold. The vacuum level in the intake manifold determines the opening and closing of the PCV valve, as well as the degree of opening, which in turn determines the amount of blow-by gases that are re-introduced into the intake manifold for combustion. 3. Function: Its main role is to direct gases from the crankcase into the intake manifold via the PCV valve, with a small amount of air entering the intake manifold directly from the air cleaner through the PCV valve. This prevents issues such as icing at the throttle, incomplete combustion, and worsened emissions, while also preventing blow-by gases from entering the atmosphere and keeping the engine oil from deteriorating.