JPH0387859U - - Google Patents

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Publication number
JPH0387859U
JPH0387859U JP14693389U JP14693389U JPH0387859U JP H0387859 U JPH0387859 U JP H0387859U JP 14693389 U JP14693389 U JP 14693389U JP 14693389 U JP14693389 U JP 14693389U JP H0387859 U JPH0387859 U JP H0387859U
Authority
JP
Japan
Prior art keywords
recirculation
negative pressure
pressure switch
gas
turns
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP14693389U
Other languages
Japanese (ja)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP14693389U priority Critical patent/JPH0387859U/ja
Publication of JPH0387859U publication Critical patent/JPH0387859U/ja
Pending legal-status Critical Current

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  • Exhaust-Gas Circulating Devices (AREA)

Description

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本考案に係るEGR故障診断装置の一
実施例及びその周辺部分の概略構成図、第2図は
同実施例における絞り部及び負圧スイツチの拡大
断面図、第3図は同負圧スイツチの動作説明のた
めの状態変化特性図である。 1……EGRバルブ、2……エキゾーストマニ
ホルド、3……インテークマニホルド、4,5…
…再循環通路、6……弁、10……制御装置、1
1……負圧スイツチ、12……絞り部、21……
ダイヤフラム、24,25……接点。
Fig. 1 is a schematic configuration diagram of an embodiment of the EGR failure diagnosis device according to the present invention and its surrounding parts, Fig. 2 is an enlarged sectional view of the throttle part and negative pressure switch in the embodiment, and Fig. 3 is the same FIG. 4 is a state change characteristic diagram for explaining the operation of the pressure switch. 1...EGR valve, 2...Exhaust manifold, 3...Intake manifold, 4, 5...
... recirculation passage, 6 ... valve, 10 ... control device, 1
1... Negative pressure switch, 12... Throttle section, 21...
Diaphragm, 24, 25... Contact.

Claims (1)

【実用新案登録請求の範囲】 エキゾーストマニホルドとインテークマニホル
ド間に排気ガスの再循環量を調節するEGRバル
ブを設けて、エンジンの運転状態に対応して、適
量の排気ガスを吸入混合気中に再循環させる排気
ガス再循環(これを「EGR」という)装置の故
障診断装置であつて、 前記EGRバルブからインテークマニホルドへ
再循環ガスを送る再循環通路内に設けられた絞り
部と、 前記再循環ガスの流れにより生じる前記絞り部
の前後の圧力差の有無により、オン・オフする負
圧スイツチと、 該負圧スイツチのオン・オフ状態に基づいてE
GRバルブが正常に作動しているか否かを判別す
る作動判別手段とを具備することを特徴とするE
GR故障診断装置。
[Claim for Utility Model Registration] An EGR valve is installed between the exhaust manifold and the intake manifold to adjust the amount of exhaust gas recirculated. A failure diagnosis device for a circulating exhaust gas recirculation (hereinafter referred to as "EGR") device, comprising: a constriction section provided in a recirculation passage that sends recirculation gas from the EGR valve to an intake manifold; and the recirculation system. A negative pressure switch that turns on and off depending on the presence or absence of a pressure difference before and after the throttle part caused by the flow of gas, and a negative pressure switch that turns on and off based on the on/off state of the negative pressure switch.
E characterized by comprising operation determination means for determining whether or not the GR valve is operating normally.
GR failure diagnosis device.
JP14693389U 1989-12-20 1989-12-20 Pending JPH0387859U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14693389U JPH0387859U (en) 1989-12-20 1989-12-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14693389U JPH0387859U (en) 1989-12-20 1989-12-20

Publications (1)

Publication Number Publication Date
JPH0387859U true JPH0387859U (en) 1991-09-06

Family

ID=31693468

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14693389U Pending JPH0387859U (en) 1989-12-20 1989-12-20

Country Status (1)

Country Link
JP (1) JPH0387859U (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57165656A (en) * 1981-04-07 1982-10-12 Nissan Motor Co Ltd Egr device of diesel engine
JPS6135374A (en) * 1984-07-27 1986-02-19 Yokogawa Hokushin Electric Corp Inspecting device for digital circuit
JPS6375345A (en) * 1986-09-16 1988-04-05 Nissan Motor Co Ltd Trouble diagnosing device for exhaust reflux device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57165656A (en) * 1981-04-07 1982-10-12 Nissan Motor Co Ltd Egr device of diesel engine
JPS6135374A (en) * 1984-07-27 1986-02-19 Yokogawa Hokushin Electric Corp Inspecting device for digital circuit
JPS6375345A (en) * 1986-09-16 1988-04-05 Nissan Motor Co Ltd Trouble diagnosing device for exhaust reflux device

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