JPH0351121U

JPH0351121U -

Info

Publication number: JPH0351121U
Application number: JP11162889U
Authority: JP
Priority date: 1989-09-26
Filing date: 1989-09-26
Publication date: 1991-05-17

Description

[Brief explanation of drawings]

第１図は本考案の第１の実施例の略示図、第２
図はＰＣＶバルブの流量特性曲線図、第３図は第
１の実施例の作動を表わすフローチヤート、第４
図は本考案の第２の実施例の略示図、第５図は同
上実施例の作動を示すフローチヤート、第６図及
び第７図は本考案の第３と第４の実施例を示す略
示図である。１……シリンダヘツドカバー、２……ＰＣＶバ
ルブ、３，５……連通管、４……オイルミストセ
パレータ、６……オイル戻り管、７……電磁遮断
弁、８……エンジンインテークマニホルド、９，
１０……圧力変換器、１１……クランクケース、
１２……オイルパン、１５……ＥＣＵ、１６……
警報ランプ、２１……予備オイルミストセパレー
タ、２２，２３……電磁三方弁、２４……オイル
戻り管、２５……電磁遮断弁、３１……フロート
、３２……スイツチ、４１，４２……金属発泡体
フイルタ、４３，４４……圧力変換器。 FIG. 1 is a schematic diagram of the first embodiment of the present invention;
The figure is a flow chart of the PCV valve, FIG. 3 is a flowchart showing the operation of the first embodiment, and FIG.
The figure is a schematic diagram of the second embodiment of the present invention, Figure 5 is a flow chart showing the operation of the same embodiment, and Figures 6 and 7 are the third and fourth embodiments of the present invention. FIG. 1... Cylinder head cover, 2... PCV valve, 3, 5... Communication pipe, 4... Oil mist separator, 6... Oil return pipe, 7... Electromagnetic cutoff valve, 8... Engine intake manifold, 9 ，
10...Pressure transducer, 11...Crank case,
12...Oil pan, 15...ECU, 16...
Alarm lamp, 21... Spare oil mist separator, 22, 23... Solenoid three-way valve, 24... Oil return pipe, 25... Solenoid cutoff valve, 31... Float, 32... Switch, 41, 42... Metal Foam filter, 43, 44...pressure transducer.

Claims

[Claim for Utility Model Registration] A positive crankcase ventilation device for an internal combustion engine in which an oil mist separator is provided upstream of a PCV valve, blow-by gas is returned to the intake pipe through the oil mist separator, and re-burned in the combustion chamber. In this step, a shutoff valve provided in an oil passage that returns oil separated from the blow-by gas to the oil reservoir of the internal combustion engine is opened and closed depending on the operating conditions of the internal combustion engine, and the pressure of the oil mist separator in the blow-by gas passage and the oil mist are controlled. a pressure measuring means for measuring the intake pipe pressure on the downstream side of the separator; and a pressure measuring means for calculating the pressure difference between the oil mist separator pressure and the intake pipe pressure measured by the pressure measuring means, and calculating the pressure difference under predetermined operating conditions of the internal combustion engine. A positive crankcase ventilation device for an internal combustion engine, comprising differential pressure determining means for outputting an abnormal signal to the outside when the pressure exceeds a set value.