Endurance test system for PCV (positive crankcase ventilation) valves

Abstract

The invention relates to a PCV (positive crankcase ventilation) valve test system, and specifically relates to an endurance test system for PCV valves. The endurance test system comprises a control unit, a drive unit, a pressure sensor, an electromagnetic valve and a PCV valve, wherein the air inlet end of the electromagnetic valve is connected with the air outlet end of the PCV valve through a pipeline, the air outlet end of the electromagnetic valve is connected with a vacuum, the electromagnetic valve is a carbon canister control valve, the pressure sensor is arranged a pipeline between the carbon canister control valve and the PCV valve, the drive unit is electrically connected with the carbon canister control valve and the control unit respectively, and the pressure sensor is electrically connected with the control unit. Through using the technical scheme of the invention, the endurance test system for PCV valves is low in cost, long in service life and accurate in test.

Description

technical field [0001] The invention relates to a PCV valve test system, in particular to a PCV valve durability test system. Background technique [0002] PCV valve, also known as crankcase ventilation volume control valve, is composed of valve body, valve, valve cover and spring. Its main function is to introduce the gas in the crankcase into the intake manifold through the PCV valve, and a small amount of air directly enters the intake manifold through the PCV valve through the air filter, which avoids freezing at the throttle, Insufficient combustion, deterioration of emissions, etc., prevent blow-by gas from entering the atmosphere, and prevent oil from deteriorating. The PCV valve is the most important control element in the PCV system, so the durability reliability of the PCV valve is very important, and durability verification must be carried out. [0003] The basic principle of the PCV valve durability test is: the PCV valve continues to work (fully open and fully...

AI Technical Summary

Problems solved by technology

The durability test system commonly used now, in order to achieve the fast full opening and closing of the PCV valve, has high requirements on the solenoid valve, and a high-speed solenoid valve must be used to meet the requirements of fast switching. At the same time, the flow rate of the solenoid valve must not be lower than the PCV. Therefore, it is usually necessary to use expensive imported high-speed and large-flow solenoid valves; in addition, the life of the solenoid valve is much worse than that of the PCV valve for millions of times, and it is very inconvenient to replace as a consumable part; The record of the number of endurance tests also generally adopts a relatively simple method: the pulse control signal of the solenoid valve is used as the number of tests and input to the counter for test records. The disadvantage of this method is that it is impossible to monitor whether the PCV valve has reached the fully open / closed state. , At the same time, during the test, if the PCV valve is blocked, it cannot work normally, and the record of the number of tests is still in progress and cannot be automatically stopped

Images